package services

// Approval-service tests. Two layers:
//
//   - Pure-Go: professionLevel strict ladder + IsValidRequiredRole +
//     responsibilityOpensGate (t-paliad-148). No DB touch.
//   - Live-DB: the full submit→approve and submit→reject flows on real
//     paliad.deadlines / paliad.approval_requests rows. Skipped when
//     TEST_DATABASE_URL is unset, mirroring audit_service_test and
//     deadline_service_test.

import (
	"context"
	"errors"
	"os"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/jmoiron/sqlx"
	_ "github.com/lib/pq"

	"mgit.msbls.de/m/paliad/internal/db"
)

// ============================================================================
// Pure-Go tests.
// ============================================================================

func TestProfessionLevel_StrictLadder(t *testing.T) {
	cases := []struct {
		profession string
		want       int
	}{
		{"partner", 5},
		{"of_counsel", 4},
		{"associate", 3},
		{"senior_pa", 2},
		{"pa", 1},
		{"paralegal", 0},
		{"", 0},
		{"unknown", 0},
		// Legacy values that pre-dated the t-paliad-148 split must NOT
		// satisfy the ladder. The SQL helper still recognises 'lead' as a
		// deprecated-shadow row until migration 058; the Go helper does
		// not — call sites have all migrated to read users.profession.
		{"lead", 0},
		{"local_counsel", 0},
		{"expert", 0},
		{"observer", 0},
	}
	for _, c := range cases {
		t.Run(c.profession, func(t *testing.T) {
			if got := professionLevel(c.profession); got != c.want {
				t.Errorf("professionLevel(%q) = %d, want %d", c.profession, got, c.want)
			}
		})
	}
}

func TestProfessionLevel_NilIsZero(t *testing.T) {
	// CRITICAL trap pin: NULL profession (empty string in Go) returns 0,
	// not "default to associate" or anything similar. This is what gates
	// external collaborators (local_counsel, expert) out of the approval
	// ladder when their project responsibility is set to 'external' but
	// their users.profession is also set to a real tier by mistake.
	if got := professionLevel(""); got != 0 {
		t.Errorf("professionLevel(\"\") must be 0, got %d — NULL profession is ineligible", got)
	}
}

func TestProfessionLevel_HigherSatisfiesLower(t *testing.T) {
	// "Anyone strictly above the required level satisfies it" — verify by
	// asserting the ladder is monotonic.
	if professionLevel("partner") <= professionLevel("associate") {
		t.Errorf("partner must outrank associate")
	}
	if professionLevel("associate") <= professionLevel("senior_pa") {
		t.Errorf("associate must outrank senior_pa")
	}
	if professionLevel("senior_pa") <= professionLevel("pa") {
		t.Errorf("senior_pa must outrank pa")
	}
	if professionLevel("of_counsel") <= professionLevel("associate") {
		t.Errorf("of_counsel must outrank associate")
	}
	// PA-required policy: anyone associate-or-above must satisfy.
	if professionLevel("associate") < professionLevel("pa") {
		t.Errorf("associate must satisfy a pa-required policy")
	}
}

func TestResponsibilityOpensGate(t *testing.T) {
	cases := []struct {
		responsibility string
		open           bool
	}{
		{"lead", true},
		{"member", true},
		{"observer", false},
		{"external", false},
		{"", false},
		{"unknown", false},
	}
	for _, c := range cases {
		t.Run(c.responsibility, func(t *testing.T) {
			if got := responsibilityOpensGate(c.responsibility); got != c.open {
				t.Errorf("responsibilityOpensGate(%q) = %v, want %v",
					c.responsibility, got, c.open)
			}
		})
	}
}

func TestIsValidRequiredRole(t *testing.T) {
	cases := []struct {
		role string
		ok   bool
	}{
		{"partner", true},
		{"of_counsel", true},
		{"associate", true},
		{"senior_pa", true},
		{"pa", true},
		{"paralegal", false},
		// Legacy values that pre-dated the t-paliad-148 split must be
		// rejected as policy targets.
		{"lead", false},
		{"local_counsel", false},
		{"expert", false},
		{"observer", false},
		{"", false},
		// 'none' is the t-paliad-154 sentinel for explicit suppression — it
		// is NOT a valid required_role for the gate (level 0). Use
		// IsValidPolicyRole if you want to allow it as a stored value.
		{"none", false},
	}
	for _, c := range cases {
		t.Run(c.role, func(t *testing.T) {
			if got := IsValidRequiredRole(c.role); got != c.ok {
				t.Errorf("IsValidRequiredRole(%q) = %v, want %v", c.role, got, c.ok)
			}
		})
	}
}

// TestIsValidPolicyRole pins the t-paliad-154 helper used by Upsert*Policy:
// it accepts the strict-ladder roles AND the 'none' sentinel that suppresses
// inherited defaults at project-row level.
func TestIsValidPolicyRole(t *testing.T) {
	cases := []struct {
		role string
		ok   bool
	}{
		{"partner", true},
		{"of_counsel", true},
		{"associate", true},
		{"senior_pa", true},
		{"pa", true},
		{"none", true}, // sentinel
		{"paralegal", false},
		{"lead", false},
		{"observer", false},
		{"", false},
	}
	for _, c := range cases {
		t.Run(c.role, func(t *testing.T) {
			if got := IsValidPolicyRole(c.role); got != c.ok {
				t.Errorf("IsValidPolicyRole(%q) = %v, want %v", c.role, got, c.ok)
			}
		})
	}
}

func TestIsValidProfession(t *testing.T) {
	for _, p := range []string{"partner", "of_counsel", "associate", "senior_pa", "pa", "paralegal"} {
		t.Run(p, func(t *testing.T) {
			if !IsValidProfession(p) {
				t.Errorf("IsValidProfession(%q) must be true", p)
			}
		})
	}
	for _, p := range []string{"", "lead", "junior_associate", "trainee", "unknown"} {
		t.Run("invalid_"+p, func(t *testing.T) {
			if IsValidProfession(p) {
				t.Errorf("IsValidProfession(%q) must be false", p)
			}
		})
	}
}

func TestIsValidResponsibility(t *testing.T) {
	// t-paliad-223 added 'admin'; the four legacy values stay valid.
	for _, r := range []string{"admin", "lead", "member", "observer", "external"} {
		t.Run(r, func(t *testing.T) {
			if !IsValidResponsibility(r) {
				t.Errorf("IsValidResponsibility(%q) must be true", r)
			}
		})
	}
	for _, r := range []string{"", "associate", "lead2", "unknown"} {
		t.Run("invalid_"+r, func(t *testing.T) {
			if IsValidResponsibility(r) {
				t.Errorf("IsValidResponsibility(%q) must be false", r)
			}
		})
	}
}

// t-paliad-223: admin maps to legacy 'lead' for the deprecated shadow
// column. The other mappings are unchanged from t-paliad-148. Pin them
// so a future refactor doesn't silently flip them.
func TestLegacyRoleFromResponsibility(t *testing.T) {
	cases := []struct {
		in, want string
	}{
		{ResponsibilityAdmin, "lead"},
		{ResponsibilityLead, "lead"},
		{ResponsibilityObserver, "observer"},
		{ResponsibilityExternal, "local_counsel"},
		{ResponsibilityMember, "associate"},
		{"", "associate"}, // unknown / empty falls through to associate
	}
	for _, c := range cases {
		t.Run(c.in, func(t *testing.T) {
			got := legacyRoleFromResponsibility(c.in)
			if got != c.want {
				t.Errorf("legacyRoleFromResponsibility(%q) = %q, want %q", c.in, got, c.want)
			}
		})
	}
}

func TestApprovalEventType(t *testing.T) {
	cases := []struct {
		entity, step, want string
	}{
		{"deadline", "requested", "deadline_approval_requested"},
		{"deadline", "approved", "deadline_approval_approved"},
		{"deadline", "rejected", "deadline_approval_rejected"},
		{"deadline", "revoked", "deadline_approval_revoked"},
		{"appointment", "requested", "appointment_approval_requested"},
	}
	for _, c := range cases {
		if got := approvalEventType(c.entity, c.step); got != c.want {
			t.Errorf("approvalEventType(%q,%q) = %q, want %q",
				c.entity, c.step, got, c.want)
		}
	}
}

// ============================================================================
// Live-DB tests.
// ============================================================================

// approvalTestEnv holds a configured ApprovalService + helpers tied to a
// throwaway project / user pool. Caller cleans up via env.cleanup().
type approvalTestEnv struct {
	t          *testing.T
	pool       *sqlx.DB
	approvals  *ApprovalService
	deadlines  *DeadlineService
	users      *UserService
	projects   *ProjectService
	projectID  uuid.UUID
	requester  uuid.UUID
	approver   uuid.UUID
	other      uuid.UUID
	cleanup    func()
}

func setupApprovalTest(t *testing.T) *approvalTestEnv {
	t.Helper()
	url := os.Getenv("TEST_DATABASE_URL")
	if url == "" {
		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
	}
	if err := db.ApplyMigrations(url); err != nil {
		t.Fatalf("apply migrations: %v", err)
	}
	pool, err := sqlx.Connect("postgres", url)
	if err != nil {
		t.Fatalf("connect: %v", err)
	}
	ctx := context.Background()

	users := NewUserService(pool)
	projects := NewProjectService(pool, users)
	deadlines := NewDeadlineService(pool, projects, nil)
	approvals := NewApprovalService(pool, users)

	// Seed two users + one project. The requester owns the deadline; the
	// approver is the other lead on the team. "other" has no role and is
	// used for the deadlock check (no qualified approver scenario).
	requesterID := uuid.New()
	approverID := uuid.New()
	otherID := uuid.New()

	for _, id := range []uuid.UUID{requesterID, approverID, otherID} {
		if _, err := pool.ExecContext(ctx,
			`INSERT INTO auth.users (id, email) VALUES ($1, $1::text || '@test.local')
			 ON CONFLICT (id) DO NOTHING`, id); err != nil {
			t.Logf("skip auth.users seed: %v (continuing — auth schema may be locked down)", err)
		}
		if _, err := pool.ExecContext(ctx,
			`INSERT INTO paliad.users (id, email, display_name, office, global_role)
			 VALUES ($1, $1::text || '@test.local', 'Test User', 'munich', 'standard')
			 ON CONFLICT (id) DO NOTHING`, id); err != nil {
			t.Fatalf("seed paliad.users: %v", err)
		}
	}

	projectID := uuid.New()
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.projects (id, type, title, status, created_by)
		 VALUES ($1, 'project', 'Approval Test Project', 'active', $2)`,
		projectID, requesterID); err != nil {
		t.Fatalf("seed project: %v", err)
	}

	// Add requester + approver to the project team. Requester=associate
	// (cannot approve associate-required policy), approver=lead (can).
	for _, m := range []struct {
		uid  uuid.UUID
		role string
	}{
		{requesterID, "associate"},
		{approverID, "lead"},
	} {
		if _, err := pool.ExecContext(ctx,
			`INSERT INTO paliad.project_teams (project_id, user_id, role)
			 VALUES ($1, $2, $3) ON CONFLICT DO NOTHING`,
			projectID, m.uid, m.role); err != nil {
			t.Fatalf("seed project_teams: %v", err)
		}
	}

	cleanup := func() {
		ctx := context.Background()
		pool.ExecContext(ctx, `DELETE FROM paliad.approval_requests WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.approval_policies WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.deadlines        WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.appointments     WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.project_events   WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.project_teams    WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.projects         WHERE id = $1`, projectID)
		for _, id := range []uuid.UUID{requesterID, approverID, otherID} {
			pool.ExecContext(ctx, `DELETE FROM paliad.users WHERE id = $1`, id)
			pool.ExecContext(ctx, `DELETE FROM auth.users   WHERE id = $1`, id)
		}
		pool.Close()
	}

	return &approvalTestEnv{
		t:         t,
		pool:      pool,
		approvals: approvals,
		deadlines: deadlines,
		users:     users,
		projects:  projects,
		projectID: projectID,
		requester: requesterID,
		approver:  approverID,
		other:     otherID,
		cleanup:   cleanup,
	}
}

// seedPolicy sets a policy on the env's project for one (entity, lifecycle).
func (e *approvalTestEnv) seedPolicy(entityType, lifecycle, requiredRole string) {
	e.t.Helper()
	if _, err := e.approvals.UpsertProjectPolicy(context.Background(),
		e.requester, e.projectID, entityType, lifecycle, requiredRole); err != nil {
		e.t.Fatalf("seed policy: %v", err)
	}
}

// seedDeadline inserts a basic deadline row directly (bypassing the
// service so we can test ApprovalService.Submit* in isolation). Returns
// the deadline's ID.
func (e *approvalTestEnv) seedDeadline(due time.Time) uuid.UUID {
	e.t.Helper()
	id := uuid.New()
	if _, err := e.pool.ExecContext(context.Background(),
		`INSERT INTO paliad.deadlines (id, project_id, title, due_date, source, status, created_by, approval_status)
		 VALUES ($1, $2, 'Test Deadline', $3, 'manual', 'pending', $4, 'approved')`,
		id, e.projectID, due, e.requester); err != nil {
		e.t.Fatalf("seed deadline: %v", err)
	}
	return id
}

// TestApprovalService_NoPolicyIsNoop: with no policy, Submit* returns
// (nil, nil) and the entity stays approval_status='approved'.
func TestApprovalService_NoPolicyIsNoop(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	defer tx.Rollback()

	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if err != nil {
		t.Fatalf("SubmitCreate: %v", err)
	}
	if reqID != nil {
		t.Errorf("expected nil request id with no policy, got %v", reqID)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	var status string
	if err := env.pool.GetContext(ctx, &status,
		`SELECT approval_status FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read status: %v", err)
	}
	if status != "approved" {
		t.Errorf("expected approval_status=approved, got %q", status)
	}
}

// TestApprovalService_SubmitMarksPendingAndApproveClears: end-to-end happy
// path. With a policy in place: submit → request row + entity pending →
// approve → entity back to approved with approved_by set.
func TestApprovalService_SubmitApproveCycle(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	// Submit (inside a tx, as DeadlineService would).
	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline,
		map[string]any{"due_date": "2026-05-20"})
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if reqID == nil {
		tx.Rollback()
		t.Fatalf("expected request id, got nil")
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	// Entity is now pending.
	var status string
	if err := env.pool.GetContext(ctx, &status,
		`SELECT approval_status FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read status: %v", err)
	}
	if status != "pending" {
		t.Errorf("after submit: approval_status=%q, want pending", status)
	}

	// Self-approval blocks.
	if err := env.approvals.Approve(ctx, *reqID, env.requester, ""); !errors.Is(err, ErrSelfApproval) {
		t.Errorf("self-approve: got %v, want ErrSelfApproval", err)
	}

	// Approver (lead) signs off.
	if err := env.approvals.Approve(ctx, *reqID, env.approver, "looks good"); err != nil {
		t.Fatalf("Approve: %v", err)
	}

	// Entity flipped back to approved with approved_by populated.
	row := struct {
		Status     string     `db:"approval_status"`
		ApprovedBy *uuid.UUID `db:"approved_by"`
	}{}
	if err := env.pool.GetContext(ctx, &row,
		`SELECT approval_status, approved_by FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read post-approve: %v", err)
	}
	if row.Status != "approved" {
		t.Errorf("after approve: approval_status=%q, want approved", row.Status)
	}
	if row.ApprovedBy == nil || *row.ApprovedBy != env.approver {
		t.Errorf("after approve: approved_by=%v, want %v", row.ApprovedBy, env.approver)
	}

	// Request row marked approved.
	var reqStatus string
	if err := env.pool.GetContext(ctx, &reqStatus,
		`SELECT status FROM paliad.approval_requests WHERE id = $1`, *reqID); err != nil {
		t.Fatalf("read request status: %v", err)
	}
	if reqStatus != "approved" {
		t.Errorf("request status=%q, want approved", reqStatus)
	}

	// Approving again fails (not pending anymore).
	if err := env.approvals.Approve(ctx, *reqID, env.approver, ""); !errors.Is(err, ErrRequestNotPending) {
		t.Errorf("re-approve: got %v, want ErrRequestNotPending", err)
	}
}

// TestApprovalService_RejectRevertsCreateAsDelete: rejecting a CREATE
// request hard-deletes the entity (it never should have existed).
func TestApprovalService_RejectCreateDeletes(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 7))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	if err := env.approvals.Reject(ctx, *reqID, env.approver, "wrong date"); err != nil {
		t.Fatalf("Reject: %v", err)
	}

	// Entity row is gone.
	var n int
	if err := env.pool.GetContext(ctx, &n,
		`SELECT COUNT(*) FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("count deadline: %v", err)
	}
	if n != 0 {
		t.Errorf("after reject-create: deadline still exists (count=%d)", n)
	}
}

// TestApprovalService_RejectUpdateRestoresPreImage: rejecting an UPDATE
// reverts the date fields back to the snapshotted pre_image values.
func TestApprovalService_RejectUpdateRestoresPreImage(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleUpdate, "associate")

	originalDue := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)
	deadlineID := env.seedDeadline(originalDue)

	// Simulate an update: set due to 2026-06-15, then submit.
	newDue := time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC)
	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	if _, err := tx.ExecContext(ctx,
		`UPDATE paliad.deadlines SET due_date = $1 WHERE id = $2`,
		newDue, deadlineID); err != nil {
		tx.Rollback()
		t.Fatalf("UPDATE pre-submit: %v", err)
	}
	preImage := map[string]any{"due_date": "2026-06-01"}
	payload := map[string]any{"due_date": "2026-06-15"}
	reqID, err := env.approvals.SubmitUpdate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, preImage, payload)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitUpdate: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	// Reject — due_date should snap back to 2026-06-01.
	if err := env.approvals.Reject(ctx, *reqID, env.approver, ""); err != nil {
		t.Fatalf("Reject: %v", err)
	}

	var got time.Time
	if err := env.pool.GetContext(ctx, &got,
		`SELECT due_date FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read due_date: %v", err)
	}
	if !got.Equal(originalDue) {
		t.Errorf("after reject-update: due_date=%v, want %v", got, originalDue)
	}
}

// TestApprovalService_NoQualifiedApprover: when only the requester would
// qualify, Submit returns ErrNoQualifiedApprover.
func TestApprovalService_NoQualifiedApprover(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	// Demote the approver to observer (level 0 = ineligible). Now requester
	// (associate) is the only on-team user with any role, and observer
	// can't approve.
	if _, err := env.pool.ExecContext(ctx,
		`UPDATE paliad.project_teams SET role='observer' WHERE project_id=$1 AND user_id=$2`,
		env.projectID, env.approver); err != nil {
		t.Fatalf("demote approver: %v", err)
	}

	// Make sure no global_admin exists in our test pool — promote-and-revert
	// any existing global_admin so the deadlock kicks in. We can't safely do
	// that without affecting other tests, so use a project where the
	// requester is the only person + setup excludes other users.
	// Easier approach: temporarily set requester to global_admin, then test
	// against a different "pretend requester" — but we want the case where
	// our seeded requester is the only candidate.
	//
	// Approach: use UpsertPolicy to set 'lead' as required role. Then no
	// project team member (associate, observer) qualifies. The deadlock
	// check still passes if any global_admin exists firmwide (Q8 escape
	// hatch), so we accept this test may be a no-op on pools with admins.
	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "lead")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	// Count global admins; if any exist (e.g. m or tester) the deadlock
	// path can't fire — skip with a note.
	var nAdmins int
	if err := env.pool.GetContext(ctx, &nAdmins,
		`SELECT COUNT(*) FROM paliad.users WHERE global_role='global_admin' AND id <> $1`,
		env.requester); err != nil {
		t.Fatalf("count admins: %v", err)
	}
	if nAdmins > 0 {
		t.Skip("global_admin exists in test pool — deadlock fallback hides ErrNoQualifiedApprover; covered indirectly via canApprove unit checks")
	}

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	defer tx.Rollback()
	_, err = env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if !errors.Is(err, ErrNoQualifiedApprover) {
		t.Errorf("got %v, want ErrNoQualifiedApprover", err)
	}
}

// TestApprovalService_RevokeRevertsAndMarksRevoked: requester revokes
// their own pending → entity reverts, request status='revoked'.
func TestApprovalService_RevokeRevertsAndMarksRevoked(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	// Non-requester can't revoke.
	if err := env.approvals.Revoke(ctx, *reqID, env.approver); !errors.Is(err, ErrNotApprover) {
		t.Errorf("non-requester revoke: got %v, want ErrNotApprover", err)
	}

	// Requester revokes — succeeds. Create lifecycle = entity gets deleted.
	if err := env.approvals.Revoke(ctx, *reqID, env.requester); err != nil {
		t.Fatalf("Revoke: %v", err)
	}

	var n int
	if err := env.pool.GetContext(ctx, &n,
		`SELECT COUNT(*) FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("count: %v", err)
	}
	if n != 0 {
		t.Errorf("after revoke-create: entity should be gone (count=%d)", n)
	}

	var reqStatus string
	if err := env.pool.GetContext(ctx, &reqStatus,
		`SELECT status FROM paliad.approval_requests WHERE id = $1`, *reqID); err != nil {
		t.Fatalf("read request: %v", err)
	}
	if reqStatus != "revoked" {
		t.Errorf("request status=%q, want revoked", reqStatus)
	}
}

// TestApprovalService_PolicyCRUDRoundtrip: upsert → list → delete.
// Uses post-t-paliad-148 profession enum (partner replaced legacy 'lead')
// and post-t-paliad-154 method names (UpsertProjectPolicy / etc).
func TestApprovalService_PolicyCRUD(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	// Upsert two rows.
	if _, err := env.approvals.UpsertProjectPolicy(ctx, env.requester, env.projectID, EntityTypeDeadline, LifecycleCreate, "associate"); err != nil {
		t.Fatalf("upsert 1: %v", err)
	}
	if _, err := env.approvals.UpsertProjectPolicy(ctx, env.requester, env.projectID, EntityTypeAppointment, LifecycleUpdate, "partner"); err != nil {
		t.Fatalf("upsert 2: %v", err)
	}

	// List.
	got, err := env.approvals.ListProjectPolicies(ctx, env.projectID)
	if err != nil {
		t.Fatalf("list: %v", err)
	}
	if len(got) != 2 {
		t.Errorf("list returned %d rows, want 2", len(got))
	}

	// Re-upsert the first to a different role.
	if _, err := env.approvals.UpsertProjectPolicy(ctx, env.requester, env.projectID, EntityTypeDeadline, LifecycleCreate, "partner"); err != nil {
		t.Fatalf("re-upsert: %v", err)
	}
	got, _ = env.approvals.ListProjectPolicies(ctx, env.projectID)
	for _, p := range got {
		if p.EntityType == EntityTypeDeadline && p.LifecycleEvent == LifecycleCreate {
			gotRole := ""
			if p.MinRole != nil {
				gotRole = *p.MinRole
			}
			if gotRole != "partner" {
				t.Errorf("after re-upsert: min_role=%q, want partner", gotRole)
			}
		}
	}

	// Invalid role rejected.
	if _, err := env.approvals.UpsertProjectPolicy(ctx, env.requester, env.projectID, EntityTypeDeadline, LifecycleCreate, "observer"); !errors.Is(err, ErrInvalidInput) {
		t.Errorf("invalid required_role: got %v, want ErrInvalidInput", err)
	}

	// 'none' sentinel accepted (suppresses inherited defaults).
	if _, err := env.approvals.UpsertProjectPolicy(ctx, env.requester, env.projectID, EntityTypeDeadline, LifecycleDelete, "none"); err != nil {
		t.Errorf("'none' sentinel rejected: %v", err)
	}

	// Delete.
	if err := env.approvals.DeleteProjectPolicy(ctx, env.requester, env.projectID, EntityTypeDeadline, LifecycleCreate); err != nil {
		t.Fatalf("delete: %v", err)
	}
	got, _ = env.approvals.ListProjectPolicies(ctx, env.projectID)
	if len(got) != 2 { // appointment.update + deadline.delete='none' remain
		t.Errorf("after delete: %d rows, want 2", len(got))
	}
}

// TestApprovalService_ListSubmittedByUser_PendingVisible pins t-paliad-160
// §D: a user with one pending approval_request must see it on /api/inbox/mine
// — neither the service nor the handler may filter pending rows out of the
// "Meine Anfragen" view. The only legitimate filter is the explicit
// ?status=... query parameter, which the handler validates against an
// allowlist (everything else is ignored).
func TestApprovalService_ListSubmittedByUser_PendingVisible(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if reqID == nil {
		tx.Rollback()
		t.Fatal("SubmitCreate returned nil request id")
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	// No filter — must include the pending row authored by env.requester.
	rows, err := env.approvals.ListSubmittedByUser(ctx, env.requester, InboxFilter{})
	if err != nil {
		t.Fatalf("ListSubmittedByUser: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("len(rows) = %d, want 1 — pending row must surface on Meine Anfragen", len(rows))
	}
	if rows[0].ID != *reqID {
		t.Errorf("rows[0].ID = %s, want %s", rows[0].ID, *reqID)
	}
	if rows[0].Status != RequestStatusPending {
		t.Errorf("rows[0].Status = %q, want pending", rows[0].Status)
	}

	// Explicit ?status=pending filter — same row.
	rows, err = env.approvals.ListSubmittedByUser(ctx, env.requester, InboxFilter{Status: RequestStatusPending})
	if err != nil {
		t.Fatalf("ListSubmittedByUser status=pending: %v", err)
	}
	if len(rows) != 1 {
		t.Errorf("status=pending filter: len(rows) = %d, want 1", len(rows))
	}

	// Explicit ?status=approved filter — empty (the row is pending).
	rows, err = env.approvals.ListSubmittedByUser(ctx, env.requester, InboxFilter{Status: RequestStatusApproved})
	if err != nil {
		t.Fatalf("ListSubmittedByUser status=approved: %v", err)
	}
	if len(rows) != 0 {
		t.Errorf("status=approved filter: len(rows) = %d, want 0", len(rows))
	}

	// Different user — empty (this is "MY submissions", scoped by requested_by).
	rows, err = env.approvals.ListSubmittedByUser(ctx, env.approver, InboxFilter{})
	if err != nil {
		t.Fatalf("ListSubmittedByUser other user: %v", err)
	}
	if len(rows) != 0 {
		t.Errorf("other user: len(rows) = %d, want 0 — must scope by requested_by", len(rows))
	}
}

// TestApprovalService_ViewerFlags pins the per-viewer eligibility flags on
// ApprovalRequestView (t-paliad-202). Drives /inbox grey-out of
// Genehmigen/Ablehnen/Zurückziehen instead of click-then-error.
//
// Matrix (one pending request, four viewers):
//
//	viewer            viewer_can_approve  viewer_is_requester
//	requester (self)  false               true                 → only Zurückziehen
//	approver (peer)   true                false                → Genehmigen + Ablehnen
//	other (no team)   false               false                → all three disabled
//	global_admin      true                false                → Genehmigen + Ablehnen
func TestApprovalService_ViewerFlags(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	// Profession + global_role tuning: the live-DB seed gives every user
	// global_role='standard' + profession=NULL, which means nobody is
	// eligible by default. Promote requester→associate (matches threshold)
	// and approver→partner (above threshold), and create a fourth user
	// with global_role='global_admin' (the override branch).
	if _, err := env.pool.ExecContext(ctx,
		`UPDATE paliad.users SET profession = 'associate' WHERE id = $1`, env.requester); err != nil {
		t.Fatalf("set requester profession: %v", err)
	}
	if _, err := env.pool.ExecContext(ctx,
		`UPDATE paliad.users SET profession = 'partner' WHERE id = $1`, env.approver); err != nil {
		t.Fatalf("set approver profession: %v", err)
	}
	adminID := uuid.New()
	if _, err := env.pool.ExecContext(ctx,
		`INSERT INTO auth.users (id, email) VALUES ($1, $1::text || '@test.local')
		 ON CONFLICT (id) DO NOTHING`, adminID); err != nil {
		t.Logf("skip auth.users seed for admin: %v (continuing)", err)
	}
	if _, err := env.pool.ExecContext(ctx,
		`INSERT INTO paliad.users (id, email, display_name, office, global_role)
		 VALUES ($1, $1::text || '@test.local', 'Admin', 'munich', 'global_admin')
		 ON CONFLICT (id) DO UPDATE SET global_role = 'global_admin'`, adminID); err != nil {
		t.Fatalf("seed admin: %v", err)
	}
	defer func() {
		ctx := context.Background()
		env.pool.ExecContext(ctx, `DELETE FROM paliad.users WHERE id = $1`, adminID)
		env.pool.ExecContext(ctx, `DELETE FROM auth.users   WHERE id = $1`, adminID)
	}()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, nil)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if reqID == nil {
		tx.Rollback()
		t.Fatal("SubmitCreate returned nil request id")
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	cases := []struct {
		name           string
		viewer         uuid.UUID
		wantCanApprove bool
		wantIsRequester bool
	}{
		{"self_authored", env.requester, false, true},
		{"eligible_approver", env.approver, true, false},
		{"non_eligible_viewer", env.other, false, false},
		{"global_admin", adminID, true, false},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			row, err := env.approvals.GetRequest(ctx, c.viewer, *reqID)
			if err != nil {
				t.Fatalf("GetRequest: %v", err)
			}
			if row == nil {
				t.Fatal("GetRequest returned nil — request should exist")
			}
			if row.ViewerCanApprove != c.wantCanApprove {
				t.Errorf("viewer_can_approve = %v, want %v",
					row.ViewerCanApprove, c.wantCanApprove)
			}
			if row.ViewerIsRequester != c.wantIsRequester {
				t.Errorf("viewer_is_requester = %v, want %v",
					row.ViewerIsRequester, c.wantIsRequester)
			}
		})
	}

	// ListPendingForApprover stamps the same flags. The approver runs the
	// query; they should see one row with viewer_can_approve=true,
	// viewer_is_requester=false.
	pending, err := env.approvals.ListPendingForApprover(ctx, env.approver, InboxFilter{})
	if err != nil {
		t.Fatalf("ListPendingForApprover: %v", err)
	}
	if len(pending) != 1 {
		t.Fatalf("len(pending) = %d, want 1", len(pending))
	}
	if !pending[0].ViewerCanApprove {
		t.Error("ListPendingForApprover: viewer_can_approve = false, want true")
	}
	if pending[0].ViewerIsRequester {
		t.Error("ListPendingForApprover: viewer_is_requester = true, want false")
	}

	// ListSubmittedByUser carries them too. Requester runs the query; the
	// one row must have viewer_can_approve=false (self-approval blocked)
	// and viewer_is_requester=true.
	mine, err := env.approvals.ListSubmittedByUser(ctx, env.requester, InboxFilter{})
	if err != nil {
		t.Fatalf("ListSubmittedByUser: %v", err)
	}
	if len(mine) != 1 {
		t.Fatalf("len(mine) = %d, want 1", len(mine))
	}
	if mine[0].ViewerCanApprove {
		t.Error("ListSubmittedByUser: viewer_can_approve = true on self-authored row, want false")
	}
	if !mine[0].ViewerIsRequester {
		t.Error("ListSubmittedByUser: viewer_is_requester = false on self-authored row, want true")
	}
}

// ============================================================================
// SuggestChanges — t-paliad-216 Slice A. The fourth approval action: the
// approver authors a counter-proposal which becomes a NEW pending row
// requested by the approver. 4-Augen still holds via the standard
// self-approval guard.
// ============================================================================

// seedPendingUpdate spins up the {policy, deadline, pending update
// request} triple SuggestChanges needs. Returns the deadline id, the
// pending request id, and the pre-image due_date (so callers can assert
// applyRevert restored it correctly).
func (e *approvalTestEnv) seedPendingUpdate(t *testing.T) (uuid.UUID, uuid.UUID, time.Time) {
	t.Helper()
	ctx := context.Background()
	e.seedPolicy(EntityTypeDeadline, LifecycleUpdate, "associate")

	originalDue := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)
	deadlineID := e.seedDeadline(originalDue)
	newDue := time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC)

	tx, err := e.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	if _, err := tx.ExecContext(ctx,
		`UPDATE paliad.deadlines SET due_date = $1 WHERE id = $2`,
		newDue, deadlineID); err != nil {
		tx.Rollback()
		t.Fatalf("UPDATE pre-submit: %v", err)
	}
	preImage := map[string]any{"due_date": "2026-06-01"}
	payload := map[string]any{"due_date": "2026-06-15"}
	reqID, err := e.approvals.SubmitUpdate(ctx, tx, e.projectID, deadlineID, e.requester, EntityTypeDeadline, preImage, payload)
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitUpdate: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}
	if reqID == nil {
		t.Fatal("SubmitUpdate returned nil request id")
	}
	return deadlineID, *reqID, originalDue
}

// TestApprovalService_SuggestChanges_HappyPath: approver suggests a
// different due_date + note. Expected end state:
//   - OLD request: status='changes_requested', decision_note set,
//     counter_payload set, decided_by=approver.
//   - Entity: approval_status='pending', pending_request_id points at
//     a NEW pending row, due_date == approver's counter_payload value.
//   - NEW request: status='pending', requested_by=approver,
//     payload=counter_payload, previous_request_id=OLD.
//   - Two project_events emitted: *_approval_changes_suggested and
//     *_approval_requested.
func TestApprovalService_SuggestChanges_HappyPath(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	deadlineID, oldReqID, _ := env.seedPendingUpdate(t)

	counterDue := time.Date(2026, 6, 20, 0, 0, 0, 0, time.UTC)
	counter := map[string]any{"due_date": "2026-06-20"}
	newReqID, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "Bitte später, Raumkonflikt am 15.6.")
	if err != nil {
		t.Fatalf("SuggestChanges: %v", err)
	}
	if newReqID == nil {
		t.Fatal("expected new request id, got nil")
	}
	if *newReqID == oldReqID {
		t.Fatal("new request id must differ from old")
	}

	// OLD row.
	oldRow := struct {
		Status          string         `db:"status"`
		DecidedBy       *uuid.UUID     `db:"decided_by"`
		DecidedAt       *time.Time     `db:"decided_at"`
		DecisionNote    *string        `db:"decision_note"`
		CounterPayload  []byte         `db:"counter_payload"`
		PreviousRequest *uuid.UUID     `db:"previous_request_id"`
		DecisionKind    *string        `db:"decision_kind"`
	}{}
	if err := env.pool.GetContext(ctx, &oldRow,
		`SELECT status, decided_by, decided_at, decision_note, counter_payload,
		        previous_request_id, decision_kind
		   FROM paliad.approval_requests WHERE id = $1`, oldReqID); err != nil {
		t.Fatalf("read old row: %v", err)
	}
	if oldRow.Status != RequestStatusChangesRequested {
		t.Errorf("old row status = %q, want %q", oldRow.Status, RequestStatusChangesRequested)
	}
	if oldRow.DecidedBy == nil || *oldRow.DecidedBy != env.approver {
		t.Errorf("old row decided_by = %v, want %v", oldRow.DecidedBy, env.approver)
	}
	if oldRow.DecisionNote == nil || *oldRow.DecisionNote == "" {
		t.Error("old row decision_note should be set")
	}
	if len(oldRow.CounterPayload) == 0 {
		t.Error("old row counter_payload should be set")
	}
	if oldRow.PreviousRequest != nil {
		t.Errorf("old row previous_request_id = %v, want NULL", oldRow.PreviousRequest)
	}
	if oldRow.DecisionKind == nil || (*oldRow.DecisionKind != DecisionKindPeer && *oldRow.DecisionKind != DecisionKindAdminOverride) {
		t.Errorf("old row decision_kind = %v, want peer or admin_override", oldRow.DecisionKind)
	}

	// NEW row.
	newRow := struct {
		Status            string     `db:"status"`
		RequestedBy       uuid.UUID  `db:"requested_by"`
		Payload           []byte     `db:"payload"`
		PreviousRequestID *uuid.UUID `db:"previous_request_id"`
		LifecycleEvent    string     `db:"lifecycle_event"`
	}{}
	if err := env.pool.GetContext(ctx, &newRow,
		`SELECT status, requested_by, payload, previous_request_id, lifecycle_event
		   FROM paliad.approval_requests WHERE id = $1`, *newReqID); err != nil {
		t.Fatalf("read new row: %v", err)
	}
	if newRow.Status != RequestStatusPending {
		t.Errorf("new row status = %q, want pending", newRow.Status)
	}
	if newRow.RequestedBy != env.approver {
		t.Errorf("new row requested_by = %v, want %v (approver)", newRow.RequestedBy, env.approver)
	}
	if newRow.PreviousRequestID == nil || *newRow.PreviousRequestID != oldReqID {
		t.Errorf("new row previous_request_id = %v, want %v", newRow.PreviousRequestID, oldReqID)
	}
	if newRow.LifecycleEvent != LifecycleUpdate {
		t.Errorf("new row lifecycle = %q, want update", newRow.LifecycleEvent)
	}

	// Entity: pending, due_date == counter.
	entity := struct {
		Status          string     `db:"approval_status"`
		PendingRequest  *uuid.UUID `db:"pending_request_id"`
		DueDate         time.Time  `db:"due_date"`
	}{}
	if err := env.pool.GetContext(ctx, &entity,
		`SELECT approval_status, pending_request_id, due_date FROM paliad.deadlines WHERE id = $1`,
		deadlineID); err != nil {
		t.Fatalf("read entity: %v", err)
	}
	if entity.Status != "pending" {
		t.Errorf("entity approval_status = %q, want pending", entity.Status)
	}
	if entity.PendingRequest == nil || *entity.PendingRequest != *newReqID {
		t.Errorf("entity pending_request_id = %v, want %v", entity.PendingRequest, *newReqID)
	}
	if !entity.DueDate.Equal(counterDue) {
		t.Errorf("entity due_date = %v, want %v (counter)", entity.DueDate, counterDue)
	}

	// Two project_events: one *_approval_changes_suggested + one *_approval_requested
	// for the NEW row.
	var nSuggested, nRequested int
	if err := env.pool.GetContext(ctx, &nSuggested,
		`SELECT COUNT(*) FROM paliad.project_events
		  WHERE project_id = $1 AND event_type = 'deadline_approval_changes_suggested'`,
		env.projectID); err != nil {
		t.Fatalf("count changes_suggested events: %v", err)
	}
	if nSuggested != 1 {
		t.Errorf("expected 1 deadline_approval_changes_suggested event, got %d", nSuggested)
	}
	if err := env.pool.GetContext(ctx, &nRequested,
		`SELECT COUNT(*) FROM paliad.project_events
		  WHERE project_id = $1 AND event_type = 'deadline_approval_requested'`,
		env.projectID); err != nil {
		t.Fatalf("count requested events: %v", err)
	}
	// Two requested events expected: one from the original SubmitUpdate +
	// one from the SuggestChanges spawn.
	if nRequested != 2 {
		t.Errorf("expected 2 deadline_approval_requested events (original + spawn), got %d", nRequested)
	}
}

// TestApprovalService_SuggestChanges_NoOpRejected: identical counter +
// empty note returns ErrSuggestionRequiresChange.
func TestApprovalService_SuggestChanges_NoOpRejected(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	_, oldReqID, _ := env.seedPendingUpdate(t)

	// Same payload as the original SubmitUpdate. No note.
	identical := map[string]any{"due_date": "2026-06-15"}
	_, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, identical, "")
	if !errors.Is(err, ErrSuggestionRequiresChange) {
		t.Errorf("no-op suggest: got %v, want ErrSuggestionRequiresChange", err)
	}

	// Empty counter, empty note → also rejected.
	_, err = env.approvals.SuggestChanges(ctx, oldReqID, env.approver, nil, "")
	if !errors.Is(err, ErrSuggestionRequiresChange) {
		t.Errorf("empty suggest: got %v, want ErrSuggestionRequiresChange", err)
	}
}

// TestApprovalService_SuggestChanges_NoteOnlyAccepted: when the counter
// is unchanged but a non-empty note is present, the call succeeds. The
// new row's payload equals the OLD payload (the approver said "I want a
// fresh look from someone else; here's why", without a different value).
func TestApprovalService_SuggestChanges_NoteOnlyAccepted(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	deadlineID, oldReqID, _ := env.seedPendingUpdate(t)

	identical := map[string]any{"due_date": "2026-06-15"}
	newReqID, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, identical, "Bitte nochmal prüfen.")
	if err != nil {
		t.Fatalf("note-only suggest: %v", err)
	}
	if newReqID == nil {
		t.Fatal("expected new request id, got nil")
	}

	// Entity's due_date stays at 2026-06-15 (the original counter == original payload).
	var got time.Time
	if err := env.pool.GetContext(ctx, &got,
		`SELECT due_date FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read due_date: %v", err)
	}
	want := time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC)
	if !got.Equal(want) {
		t.Errorf("entity due_date = %v, want %v", got, want)
	}
}

// TestApprovalService_SuggestChanges_SelfApprovalBlocked: the original
// requester cannot suggest changes on their own row (would equal
// self-approval).
func TestApprovalService_SuggestChanges_SelfApprovalBlocked(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	_, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"due_date": "2026-06-20"}
	_, err := env.approvals.SuggestChanges(ctx, oldReqID, env.requester, counter, "")
	if !errors.Is(err, ErrSelfApproval) {
		t.Errorf("self suggest: got %v, want ErrSelfApproval", err)
	}
}

// TestApprovalService_SuggestChanges_RequestNotPending: a row already
// decided (approved/rejected/revoked/changes_requested) rejects further
// suggest-changes calls.
func TestApprovalService_SuggestChanges_RequestNotPending(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	_, oldReqID, _ := env.seedPendingUpdate(t)

	// Approve first.
	if err := env.approvals.Approve(ctx, oldReqID, env.approver, "ok"); err != nil {
		t.Fatalf("Approve: %v", err)
	}

	counter := map[string]any{"due_date": "2026-06-20"}
	_, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "too late")
	if !errors.Is(err, ErrRequestNotPending) {
		t.Errorf("decided row suggest: got %v, want ErrRequestNotPending", err)
	}
}

// TestApprovalService_SuggestChanges_LifecycleInvalid: lifecycle ∉
// (update, complete) rejects with ErrSuggestionLifecycleInvalid. A
// create-lifecycle pending request is the easiest to set up.
func TestApprovalService_SuggestChanges_LifecycleInvalid(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	env.seedPolicy(EntityTypeDeadline, LifecycleCreate, "associate")
	deadlineID := env.seedDeadline(time.Now().AddDate(0, 0, 14))

	tx, err := env.pool.BeginTxx(ctx, nil)
	if err != nil {
		t.Fatalf("begin: %v", err)
	}
	reqID, err := env.approvals.SubmitCreate(ctx, tx, env.projectID, deadlineID, env.requester, EntityTypeDeadline, map[string]any{"due_date": "2026-05-20"})
	if err != nil {
		tx.Rollback()
		t.Fatalf("SubmitCreate: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}

	counter := map[string]any{"due_date": "2026-06-01"}
	_, err = env.approvals.SuggestChanges(ctx, *reqID, env.approver, counter, "different date")
	if !errors.Is(err, ErrSuggestionLifecycleInvalid) {
		t.Errorf("create-lifecycle suggest: got %v, want ErrSuggestionLifecycleInvalid", err)
	}
}

// TestApprovalService_SuggestChanges_OriginalRequesterCanApproveCounter:
// the cleanest verification of m's Q6 mental model — after the approver
// suggests changes, the ORIGINAL REQUESTER is no longer the new row's
// requested_by and can now approve the counter themselves (provided
// their profession is sufficient). For this test we promote the requester
// to 'partner' profession so they pass the canApprove gate.
func TestApprovalService_SuggestChanges_OriginalRequesterCanApproveCounter(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	// Promote the requester so they qualify as an approver of the counter.
	// The original Submit was theirs (excluded as requested_by); for the
	// counter their role lets them sign off.
	if _, err := env.pool.ExecContext(ctx,
		`UPDATE paliad.users SET profession='partner' WHERE id = $1`, env.requester); err != nil {
		t.Fatalf("promote requester profession: %v", err)
	}
	if _, err := env.pool.ExecContext(ctx,
		`UPDATE paliad.users SET profession='partner' WHERE id = $1`, env.approver); err != nil {
		t.Fatalf("promote approver profession: %v", err)
	}

	deadlineID, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"due_date": "2026-06-22"}
	newReqID, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "Lieber den 22.")
	if err != nil {
		t.Fatalf("SuggestChanges: %v", err)
	}

	// Original requester approves the counter.
	if err := env.approvals.Approve(ctx, *newReqID, env.requester, "Ja, passt."); err != nil {
		t.Fatalf("original requester approves counter: %v", err)
	}

	// Entity is back to approved with the counter date.
	row := struct {
		Status     string     `db:"approval_status"`
		ApprovedBy *uuid.UUID `db:"approved_by"`
		DueDate    time.Time  `db:"due_date"`
	}{}
	if err := env.pool.GetContext(ctx, &row,
		`SELECT approval_status, approved_by, due_date FROM paliad.deadlines WHERE id = $1`,
		deadlineID); err != nil {
		t.Fatalf("read entity: %v", err)
	}
	if row.Status != "approved" {
		t.Errorf("entity approval_status = %q, want approved", row.Status)
	}
	if row.ApprovedBy == nil || *row.ApprovedBy != env.requester {
		t.Errorf("approved_by = %v, want %v (original requester)", row.ApprovedBy, env.requester)
	}
	want := time.Date(2026, 6, 22, 0, 0, 0, 0, time.UTC)
	if !row.DueDate.Equal(want) {
		t.Errorf("due_date = %v, want %v", row.DueDate, want)
	}
}

// TestApprovalService_SuggestChanges_CounterApproverCannotSelfApprove:
// after suggest-changes, the approver who suggested (= new row's
// requested_by) is blocked from approving their own counter — 4-Augen
// still holds.
func TestApprovalService_SuggestChanges_CounterApproverCannotSelfApprove(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	_, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"due_date": "2026-06-22"}
	newReqID, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "")
	if err != nil {
		t.Fatalf("SuggestChanges: %v", err)
	}

	if err := env.approvals.Approve(ctx, *newReqID, env.approver, ""); !errors.Is(err, ErrSelfApproval) {
		t.Errorf("counter author self-approves: got %v, want ErrSelfApproval", err)
	}
}

// TestApprovalService_SuggestChanges_TitleOnlyCounter pins t-paliad-217
// Slice B: the counter-allowlist now accepts the wider field set
// (title / description / notes / rule_code / event_type_ids on
// deadlines). A counter that ONLY changes the title (no date diff) must
// succeed — the new pending row's payload carries the title, and the
// entity row's title field is updated in-tx.
func TestApprovalService_SuggestChanges_TitleOnlyCounter(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	deadlineID, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"title": "Klageerwiderung — Vorschlag Hertz"}
	newReqID, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "")
	if err != nil {
		t.Fatalf("title-only suggest: %v", err)
	}
	if newReqID == nil {
		t.Fatal("expected new request id, got nil")
	}

	// Entity's title flipped.
	var gotTitle string
	if err := env.pool.GetContext(ctx, &gotTitle,
		`SELECT title FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read title: %v", err)
	}
	if gotTitle != "Klageerwiderung — Vorschlag Hertz" {
		t.Errorf("entity title = %q, want %q", gotTitle, "Klageerwiderung — Vorschlag Hertz")
	}
}

// TestApprovalService_SuggestChanges_NotesOnlyCounter pins t-paliad-217
// Slice B: notes is in the counter-allowlist and a notes-only counter
// must succeed. Empty-string clears the column (NULLable text).
func TestApprovalService_SuggestChanges_NotesOnlyCounter(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	deadlineID, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"notes": "Bitte vor Einreichung mit Mandant abstimmen."}
	if _, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, ""); err != nil {
		t.Fatalf("notes-only suggest: %v", err)
	}

	var gotNotes *string
	if err := env.pool.GetContext(ctx, &gotNotes,
		`SELECT notes FROM paliad.deadlines WHERE id = $1`, deadlineID); err != nil {
		t.Fatalf("read notes: %v", err)
	}
	if gotNotes == nil || *gotNotes != "Bitte vor Einreichung mit Mandant abstimmen." {
		t.Errorf("entity notes = %v, want set", gotNotes)
	}
}

// TestApprovalService_SuggestChanges_EmptyTitleRejected pins the title
// non-empty CHECK on the counter-allowlist: title is NOT NULL on the
// deadlines column, so a counter that explicitly sends "" for title
// must be rejected with ErrSuggestionRequiresChange (not silently
// dropped or written as a NULL).
func TestApprovalService_SuggestChanges_EmptyTitleRejected(t *testing.T) {
	env := setupApprovalTest(t)
	defer env.cleanup()
	ctx := context.Background()

	_, oldReqID, _ := env.seedPendingUpdate(t)

	counter := map[string]any{"title": "   "} // whitespace-only
	_, err := env.approvals.SuggestChanges(ctx, oldReqID, env.approver, counter, "")
	if !errors.Is(err, ErrSuggestionRequiresChange) {
		t.Errorf("empty-title suggest: got %v, want ErrSuggestionRequiresChange", err)
	}
}