package gitea

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"
)

func TestCloseIssueRoundTrip(t *testing.T) {
	var gotState string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPatch {
			t.Errorf("method = %s, want PATCH", r.Method)
		}
		if r.Header.Get("Content-Type") != "application/json" {
			t.Errorf("Content-Type = %q", r.Header.Get("Content-Type"))
		}
		var body map[string]string
		_ = json.NewDecoder(r.Body).Decode(&body)
		gotState = body["state"]
		w.WriteHeader(201)
		_, _ = io.WriteString(w, `{}`)
	}))
	defer srv.Close()
	c := New(srv.URL, "tok")
	if err := c.CloseIssue(context.Background(), "m", "projax", 42); err != nil {
		t.Fatalf("CloseIssue: %v", err)
	}
	if gotState != "closed" {
		t.Errorf("upstream got state=%q, want 'closed'", gotState)
	}
}

func TestReopenIssueRoundTrip(t *testing.T) {
	var gotState string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var body map[string]string
		_ = json.NewDecoder(r.Body).Decode(&body)
		gotState = body["state"]
		w.WriteHeader(201)
		_, _ = io.WriteString(w, `{}`)
	}))
	defer srv.Close()
	c := New(srv.URL, "tok")
	if err := c.ReopenIssue(context.Background(), "m", "projax", 42); err != nil {
		t.Fatalf("ReopenIssue: %v", err)
	}
	if gotState != "open" {
		t.Errorf("upstream got state=%q, want 'open'", gotState)
	}
}

func TestCreateIssueRoundTrip(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("method = %s, want POST", r.Method)
		}
		if !strings.HasSuffix(r.URL.Path, "/issues") {
			t.Errorf("path = %q, want suffix /issues", r.URL.Path)
		}
		var body map[string]string
		_ = json.NewDecoder(r.Body).Decode(&body)
		if body["title"] != "Test issue" {
			t.Errorf("title = %q", body["title"])
		}
		w.WriteHeader(201)
		_, _ = io.WriteString(w, `{
			"number": 99,
			"title": "Test issue",
			"state": "open",
			"updated_at": "2026-05-15T19:00:00Z",
			"html_url": "https://mgit.msbls.de/m/projax/issues/99",
			"labels": [{"name": "bug"}],
			"assignees": [{"login": "mAi"}]
		}`)
	}))
	defer srv.Close()
	c := New(srv.URL, "tok")
	iss, err := c.CreateIssue(context.Background(), "m", "projax", "Test issue", "body")
	if err != nil {
		t.Fatalf("CreateIssue: %v", err)
	}
	if iss.Number != 99 || iss.State != "open" {
		t.Errorf("issue = %+v", iss)
	}
	if len(iss.Labels) != 1 || iss.Labels[0] != "bug" {
		t.Errorf("labels = %v", iss.Labels)
	}
	if len(iss.Assignees) != 1 || iss.Assignees[0] != "mAi" {
		t.Errorf("assignees = %v", iss.Assignees)
	}
}

func TestAddCommentRoundTrip(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if !strings.HasSuffix(r.URL.Path, "/comments") {
			t.Errorf("path = %q", r.URL.Path)
		}
		var body map[string]string
		_ = json.NewDecoder(r.Body).Decode(&body)
		if body["body"] != "First!" {
			t.Errorf("body = %q", body["body"])
		}
		w.WriteHeader(201)
		_, _ = io.WriteString(w, `{
			"id": 12345,
			"body": "First!",
			"html_url": "https://mgit.msbls.de/m/projax/issues/42#issuecomment-12345",
			"created_at": "2026-05-15T19:00:00Z"
		}`)
	}))
	defer srv.Close()
	c := New(srv.URL, "tok")
	cm, err := c.AddComment(context.Background(), "m", "projax", 42, "First!")
	if err != nil {
		t.Fatalf("AddComment: %v", err)
	}
	if cm.ID != 12345 || cm.Body != "First!" {
		t.Errorf("comment = %+v", cm)
	}
	want := time.Date(2026, 5, 15, 19, 0, 0, 0, time.UTC)
	if !cm.CreatedAt.Equal(want) {
		t.Errorf("CreatedAt = %v, want %v", cm.CreatedAt, want)
	}
}

func TestWriteback403ReturnsErrForbidden(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, `{"message":"forbidden"}`, http.StatusForbidden)
	}))
	defer srv.Close()
	c := New(srv.URL, "tok")
	if err := c.CloseIssue(context.Background(), "m", "projax", 1); err != ErrForbidden {
		t.Errorf("expected ErrForbidden, got %v", err)
	}
}