package services

// Live-DB integration test for ProjectionService — applies migrations,
// seeds one project + one deadline + one appointment + one
// timeline_kind-tagged project_event, and asserts the merge returns
// three rows in the right order. Skipped when TEST_DATABASE_URL is
// unset, mirroring the convention of the other live tests in this
// package.

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"
)

func TestProjectionService_For_MergesActuals_Live(t *testing.T) {
	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)
	}
	defer pool.Close()

	ctx := context.Background()
	userID := uuid.New()
	projectID := uuid.New()
	deadlineID := uuid.New()
	apptID := uuid.New()
	milestoneID := uuid.New()
	auditOnlyID := uuid.New() // timeline_kind=NULL — must NOT surface in default read

	cleanup := func() {
		pool.ExecContext(ctx, `DELETE FROM paliad.appointments    WHERE id = $1`, apptID)
		pool.ExecContext(ctx, `DELETE FROM paliad.deadlines       WHERE id = $1`, deadlineID)
		pool.ExecContext(ctx, `DELETE FROM paliad.project_events  WHERE id IN ($1, $2)`, milestoneID, auditOnlyID)
		pool.ExecContext(ctx, `DELETE FROM paliad.project_teams   WHERE project_id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.projects        WHERE id = $1`, projectID)
		pool.ExecContext(ctx, `DELETE FROM paliad.users           WHERE id = $1`, userID)
		pool.ExecContext(ctx, `DELETE FROM auth.users             WHERE id = $1`, userID)
	}
	cleanup()
	defer cleanup()

	if _, err := pool.ExecContext(ctx,
		`INSERT INTO auth.users (id, email) VALUES ($1, 'projection-test@hlc.com')`,
		userID); err != nil {
		t.Fatalf("seed auth.users: %v", err)
	}
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.users (id, email, display_name, office, global_role, lang)
		 VALUES ($1, 'projection-test@hlc.com', 'Projection Test', 'munich', 'global_admin', 'de')`,
		userID); err != nil {
		t.Fatalf("seed paliad.users: %v", err)
	}
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.projects (id, type, path, title, reference, status, created_by)
		 VALUES ($1, 'case', $1::text, 'Projection Test Project', '2026/9993', 'active', $2)`,
		projectID, userID); err != nil {
		t.Fatalf("seed paliad.projects: %v", err)
	}

	now := time.Now().UTC()
	deadlineDate := now.AddDate(0, 0, 7) // a week from now
	apptDate := now.AddDate(0, 0, 14)    // two weeks from now
	milestoneDate := now.AddDate(0, 0, -3) // three days ago

	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.deadlines
		   (id, project_id, title, due_date, source, status, created_by)
		 VALUES ($1, $2, 'Test Deadline', $3::date, 'manual', 'pending', $4)`,
		deadlineID, projectID, deadlineDate.Format("2006-01-02"), userID); err != nil {
		t.Fatalf("seed deadline: %v", err)
	}
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.appointments
		   (id, project_id, title, start_at, appointment_type, created_by)
		 VALUES ($1, $2, 'Test Appointment', $3, 'meeting', $4)`,
		apptID, projectID, apptDate, userID); err != nil {
		t.Fatalf("seed appointment: %v", err)
	}
	// Two project_events: one with timeline_kind set (must surface), one
	// without (must be filtered out unless include_audit_full).
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.project_events
		   (id, project_id, event_type, title, event_date, created_by, metadata,
		    created_at, updated_at, timeline_kind)
		 VALUES ($1, $2, 'custom_milestone', 'Test Milestone', $3, $4,
		         '{}'::jsonb, $5, $5, 'custom_milestone')`,
		milestoneID, projectID, milestoneDate, userID, now); err != nil {
		t.Fatalf("seed milestone project_event: %v", err)
	}
	if _, err := pool.ExecContext(ctx,
		`INSERT INTO paliad.project_events
		   (id, project_id, event_type, title, event_date, created_by, metadata,
		    created_at, updated_at)
		 VALUES ($1, $2, 'project_created', 'Audit-Only Event', $3, $4,
		         '{}'::jsonb, $5, $5)`,
		auditOnlyID, projectID, milestoneDate.Add(-1*time.Hour), userID, now); err != nil {
		t.Fatalf("seed audit-only project_event: %v", err)
	}

	users := NewUserService(pool)
	projects := NewProjectService(pool, users)
	eventTypes := NewEventTypeService(pool, users)
	deadlines := NewDeadlineService(pool, projects, eventTypes)
	appointments := NewAppointmentService(pool, projects)
	rules := NewDeadlineRuleService(pool)
	holidays := NewHolidayService(pool)
	courts := NewCourtService(pool)
	fristen := NewFristenrechnerService(rules, holidays, courts)
	projection := NewProjectionService(pool, projects, deadlines, appointments, fristen, rules)

	t.Run("default — only timeline_kind milestones surface", func(t *testing.T) {
		rows, _, err := projection.For(ctx, userID, projectID, ProjectionOpts{})
		if err != nil {
			t.Fatalf("For: %v", err)
		}
		// Filter to seed rows so unrelated rows in the live DB don't
		// confuse the assertions. We reference rows by provenance ID.
		seen := map[string]TimelineEvent{}
		for _, r := range rows {
			switch {
			case r.DeadlineID != nil && *r.DeadlineID == deadlineID:
				seen["deadline"] = r
			case r.AppointmentID != nil && *r.AppointmentID == apptID:
				seen["appointment"] = r
			case r.ProjectEventID != nil && *r.ProjectEventID == milestoneID:
				seen["milestone"] = r
			case r.ProjectEventID != nil && *r.ProjectEventID == auditOnlyID:
				t.Errorf("audit-only project_event leaked into default read")
			}
		}
		if len(seen) != 3 {
			t.Fatalf("expected 3 seed rows, saw %d: %v", len(seen), seen)
		}
		// Sort order: milestone (3 days ago) → deadline (+7d) → appointment (+14d).
		// Find the indices of our seeded rows in the result and check the
		// relative ordering.
		idx := func(id uuid.UUID) int {
			for i, r := range rows {
				switch {
				case r.DeadlineID != nil && *r.DeadlineID == id:
					return i
				case r.AppointmentID != nil && *r.AppointmentID == id:
					return i
				case r.ProjectEventID != nil && *r.ProjectEventID == id:
					return i
				}
			}
			return -1
		}
		if !(idx(milestoneID) < idx(deadlineID) && idx(deadlineID) < idx(apptID)) {
			t.Errorf("wrong sort: milestone=%d deadline=%d appt=%d (want asc)",
				idx(milestoneID), idx(deadlineID), idx(apptID))
		}

		// Field shape — kind, status, deep-link IDs.
		dl := seen["deadline"]
		if dl.Kind != "deadline" {
			t.Errorf("deadline.Kind = %q, want deadline", dl.Kind)
		}
		if dl.Status != "open" {
			t.Errorf("deadline.Status = %q, want open (future date)", dl.Status)
		}
		if dl.Title != "Test Deadline" {
			t.Errorf("deadline.Title = %q", dl.Title)
		}
		ap := seen["appointment"]
		if ap.Kind != "appointment" || ap.Status != "open" {
			t.Errorf("appointment kind/status = %q/%q", ap.Kind, ap.Status)
		}
		ms := seen["milestone"]
		if ms.Kind != "milestone" || ms.Status != "off_script" {
			t.Errorf("milestone kind/status = %q/%q (want milestone/off_script)",
				ms.Kind, ms.Status)
		}
	})

	t.Run("IncludeAuditFull — both project_events surface", func(t *testing.T) {
		rows, _, err := projection.For(ctx, userID, projectID, ProjectionOpts{IncludeAuditFull: true})
		if err != nil {
			t.Fatalf("For audit_full: %v", err)
		}
		var sawAudit bool
		for _, r := range rows {
			if r.ProjectEventID != nil && *r.ProjectEventID == auditOnlyID {
				sawAudit = true
				break
			}
		}
		if !sawAudit {
			t.Errorf("audit-only project_event should surface with IncludeAuditFull=true")
		}
	})

	t.Run("RecordCustomMilestone writes a row with timeline_kind set", func(t *testing.T) {
		title := "Live-Test Custom Milestone"
		desc := "from RecordCustomMilestone test"
		when := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)

		ev, err := projection.RecordCustomMilestone(ctx, userID, projectID, title, &desc, &when, false)
		if err != nil {
			t.Fatalf("RecordCustomMilestone: %v", err)
		}
		if ev == nil || ev.ProjectEventID == nil {
			t.Fatalf("RecordCustomMilestone returned nil id")
		}
		// Defer cleanup so the row doesn't leak into other tests.
		defer pool.ExecContext(ctx, `DELETE FROM paliad.project_events WHERE id = $1`, *ev.ProjectEventID)

		// Verify the row landed with the expected discriminators.
		var (
			eventType    string
			timelineKind *string
		)
		if err := pool.QueryRowContext(ctx,
			`SELECT event_type, timeline_kind FROM paliad.project_events WHERE id = $1`,
			*ev.ProjectEventID).Scan(&eventType, &timelineKind); err != nil {
			t.Fatalf("read back: %v", err)
		}
		if eventType != "custom_milestone" {
			t.Errorf("event_type = %q, want custom_milestone", eventType)
		}
		if timelineKind == nil || *timelineKind != "custom_milestone" {
			t.Errorf("timeline_kind = %v, want custom_milestone", timelineKind)
		}

		// And it must surface in the next read.
		rows, _, err := projection.For(ctx, userID, projectID, ProjectionOpts{})
		if err != nil {
			t.Fatalf("For after milestone: %v", err)
		}
		var found bool
		for _, r := range rows {
			if r.ProjectEventID != nil && *r.ProjectEventID == *ev.ProjectEventID {
				found = true
				break
			}
		}
		if !found {
			t.Errorf("newly recorded milestone did not surface in For()")
		}
	})
}

// TestExpandCrossProceedingSpawns covers the Phase 3 Slice 7
// (t-paliad-188) cross-proceeding spawn wiring on a live DB with
// synthetic fixtures. Three scenarios:
//
//  1. A spawn rule in proceeding A pointing at proceeding B → expansion
//     emits exactly one spawned-into TimelineEvent whose RuleCode
//     matches B's first (lowest sequence_order) rule.
//
//  2. A spawn cycle (A → B → A) → ErrCyclicSpawn surfaces; no rows
//     emitted on the cycle branch; the recursion stops at the second
//     hop without infinite-looping.
//
//  3. Multi-spawn defensive: proceeding A with two spawn rules each
//     targeting DIFFERENT downstream proceedings (B + C) → two
//     spawned-into rows in the output, one per target.
//
// Skipped when TEST_DATABASE_URL is unset.
func TestExpandCrossProceedingSpawns(t *testing.T) {
	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)
	}
	defer pool.Close()

	ctx := context.Background()

	cleanup := func() {
		pool.ExecContext(ctx,
			`SELECT set_config('paliad.audit_reason', 'slice 7 test cleanup', true)`)
		pool.ExecContext(ctx,
			`DELETE FROM paliad.deadline_rules WHERE name LIKE 'SLICE7_TEST_%'`)
		pool.ExecContext(ctx,
			`DELETE FROM paliad.proceeding_types WHERE code LIKE 'SLICE7_TEST_%'`)
	}
	cleanup()
	defer cleanup()

	type ptRow struct {
		ID   int    `db:"id"`
		Code string `db:"code"`
	}
	var pts []ptRow
	if err := pool.SelectContext(ctx, &pts, `
		INSERT INTO paliad.proceeding_types (code, name, name_en, category, jurisdiction, is_active)
		VALUES
		    ('SLICE7_TEST_A', 'Slice7 Test A', 'Slice7 Test A', 'fristenrechner', 'UPC', true),
		    ('SLICE7_TEST_B', 'Slice7 Test B', 'Slice7 Test B', 'fristenrechner', 'UPC', true),
		    ('SLICE7_TEST_C', 'Slice7 Test C', 'Slice7 Test C', 'fristenrechner', 'UPC', true)
		RETURNING id, code`); err != nil {
		t.Fatalf("seed proceeding_types: %v", err)
	}
	ptByCode := make(map[string]int, len(pts))
	for _, pt := range pts {
		ptByCode[pt.Code] = pt.ID
	}

	insertRule := func(label, code string, ptID, sequenceOrder int, isSpawn bool, spawnTargetPT *int) uuid.UUID {
		if _, err := pool.ExecContext(ctx,
			`SELECT set_config('paliad.audit_reason', $1, true)`,
			"slice 7 test seed: "+label); err != nil {
			t.Fatalf("set audit_reason: %v", err)
		}
		id := uuid.New()
		// Slice 9 (t-paliad-195) dropped is_mandatory / is_optional;
		// the seed uses the live post-Slice-9 column set.
		_, err := pool.ExecContext(ctx,
			`INSERT INTO paliad.deadline_rules
			    (id, proceeding_type_id, name, name_en, submission_code, duration_value, duration_unit,
			     timing, is_court_set, is_spawn,
			     spawn_proceeding_type_id, sequence_order, is_active, priority,
			     lifecycle_state, created_at, updated_at)
			 VALUES ($1, $2, $3, $3, $4, 0, 'days', 'after', false, $5, $6, $7,
			         true, 'mandatory', 'published', now(), now())`,
			id, ptID, label, code, isSpawn, spawnTargetPT, sequenceOrder)
		if err != nil {
			t.Fatalf("seed rule %q: %v", label, err)
		}
		return id
	}

	bRootID := insertRule("SLICE7_TEST_B_root", "b.root", ptByCode["SLICE7_TEST_B"], 0, false, nil)
	bPTID := ptByCode["SLICE7_TEST_B"]
	aSpawnID := insertRule("SLICE7_TEST_A_spawn", "a.spawn", ptByCode["SLICE7_TEST_A"], 0, true, &bPTID)

	rules := NewDeadlineRuleService(pool)
	svc := &ProjectionService{db: pool, rules: rules}

	aPTID := ptByCode["SLICE7_TEST_A"]
	aRules, err := rules.List(ctx, &aPTID)
	if err != nil {
		t.Fatalf("load A rules: %v", err)
	}

	sourceDeadlines := []UIDeadline{
		{RuleID: aSpawnID.String(), DueDate: "2026-03-15", Code: "a.spawn"},
	}

	visited := map[int]bool{aPTID: true}
	rows, err := svc.expandCrossProceedingSpawns(ctx, aRules, sourceDeadlines, visited, 0)
	if err != nil {
		t.Fatalf("scenario 1 expand: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("scenario 1: got %d rows, want 1", len(rows))
	}
	if rows[0].RuleCode != "b.root" {
		t.Errorf("scenario 1: RuleCode=%q, want b.root", rows[0].RuleCode)
	}
	if rows[0].DeadlineRuleID == nil || *rows[0].DeadlineRuleID != bRootID {
		t.Errorf("scenario 1: DeadlineRuleID = %v, want %v", rows[0].DeadlineRuleID, bRootID)
	}
	if rows[0].DependsOnRuleCode != "a.spawn" {
		t.Errorf("scenario 1: DependsOnRuleCode = %q, want a.spawn", rows[0].DependsOnRuleCode)
	}
	if rows[0].DependsOnDate == nil || rows[0].DependsOnDate.Format("2006-01-02") != "2026-03-15" {
		t.Errorf("scenario 1: DependsOnDate = %v, want 2026-03-15", rows[0].DependsOnDate)
	}
	if rows[0].Track != "spawn" {
		t.Errorf("scenario 1: Track = %q, want spawn", rows[0].Track)
	}

	// Scenario 2: cycle A → B → A.
	_ = insertRule("SLICE7_TEST_B_spawn_back", "b.spawn_back", ptByCode["SLICE7_TEST_B"], 1, true, &aPTID)

	aRules2, _ := rules.List(ctx, &aPTID)
	rows2, err := svc.expandCrossProceedingSpawns(ctx, aRules2, sourceDeadlines, map[int]bool{aPTID: true}, 0)
	if err == nil {
		t.Fatalf("scenario 2: expected ErrCyclicSpawn, got nil (rows=%d)", len(rows2))
	}
	if !errors.Is(err, ErrCyclicSpawn) {
		t.Errorf("scenario 2: wrong error type: %v", err)
	}

	// Scenario 3: multi-spawn defensive. Drop the cycle-edge first.
	pool.ExecContext(ctx,
		`SELECT set_config('paliad.audit_reason', 'slice 7 test: drop B->A spawn for multi-spawn scenario', true)`)
	pool.ExecContext(ctx,
		`DELETE FROM paliad.deadline_rules WHERE name = 'SLICE7_TEST_B_spawn_back'`)

	cPTID := ptByCode["SLICE7_TEST_C"]
	insertRule("SLICE7_TEST_C_root", "c.root", ptByCode["SLICE7_TEST_C"], 0, false, nil)
	aSpawnC := insertRule("SLICE7_TEST_A_spawn_c", "a.spawn_c", ptByCode["SLICE7_TEST_A"], 1, true, &cPTID)

	aRules3, _ := rules.List(ctx, &aPTID)
	sourceDeadlines3 := []UIDeadline{
		{RuleID: aSpawnID.String(), DueDate: "2026-03-15", Code: "a.spawn"},
		{RuleID: aSpawnC.String(), DueDate: "2026-04-01", Code: "a.spawn_c"},
	}
	rows3, err := svc.expandCrossProceedingSpawns(ctx, aRules3, sourceDeadlines3, map[int]bool{aPTID: true}, 0)
	if err != nil {
		t.Fatalf("scenario 3 expand: %v", err)
	}
	if len(rows3) != 2 {
		t.Fatalf("scenario 3: got %d rows, want 2", len(rows3))
	}
	wantCodes := map[string]bool{"b.root": false, "c.root": false}
	for _, ev := range rows3 {
		if _, ok := wantCodes[ev.RuleCode]; ok {
			wantCodes[ev.RuleCode] = true
		}
	}
	for code, seen := range wantCodes {
		if !seen {
			t.Errorf("scenario 3: missing spawned-into row for %q", code)
		}
	}
}