package web

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"naviwatcher/internal/config"
	"naviwatcher/internal/database"
)

// seedArtist inserts an artist_settings row and returns its ID.
func seedArtist(t *testing.T, db *database.DB, id, name, mbid string, monitored bool) {
	t.Helper()
	if err := database.SaveArtistSettings(db, &database.ArtistSettings{
		ID:        id,
		Name:      name,
		MBID:      mbid,
		Monitored: monitored,
	}); err != nil {
		t.Fatalf("seed artist %s: %v", id, err)
	}
}

// seedLocalAlbum inserts a local_albums row.
func seedLocalAlbum(t *testing.T, db *database.DB, id, artistID, title string) {
	t.Helper()
	if err := database.SaveLocalAlbum(db, &database.LocalAlbum{ID: id, ArtistID: artistID, Title: title}); err != nil {
		t.Fatalf("seed local album %s: %v", id, err)
	}
}

// seedExternalRelease inserts an external_releases row (not ignored).
func seedExternalRelease(t *testing.T, db *database.DB, rgid, artistID, title string) {
	t.Helper()
	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
		RGID:     rgid,
		ArtistID: artistID,
		Title:    title,
	}); err != nil {
		t.Fatalf("seed external release %s: %v", rgid, err)
	}
}

func newServer(t *testing.T, user, pass string) (*Server, *database.DB) {
	t.Helper()
	db, err := database.New(":memory:")
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	cfg := &config.ServerConfig{Host: "0.0.0.0", Port: 8080, Username: user, Password: pass}
	s := NewServer(cfg, db, "http://ui.example")
	return s, db
}

func TestDashboard_Authenticated200(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "mbid-1", true)
	seedLocalAlbum(t, db, "l1", "a1", "OK Computer")
	// One missing release (no local album matches "Kid A").
	seedExternalRelease(t, db, "r1", "a1", "Kid A")

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	body := rec.Body.String()
	if !strings.Contains(body, "Radiohead") {
		t.Errorf("expected artist name in body, got:\n%s", body)
	}
	if !strings.Contains(body, "1") {
		t.Errorf("expected missing count rendered, got:\n%s", body)
	}
	if !strings.Contains(body, "mbid-1") {
		t.Errorf("expected MBID rendered, got:\n%s", body)
	}
}

func TestDashboard_Unauthenticated401(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", rec.Code)
	}
	if !strings.Contains(rec.Header().Get("WWW-Authenticate"), "Basic") {
		t.Errorf("expected Basic auth challenge, got headers: %v", rec.Header())
	}
}

func TestDashboard_WrongPassword401(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.SetBasicAuth("admin", "wrong")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 for wrong password, got %d", rec.Code)
	}
}

func TestDashboard_NoAuthWhenDisabled(t *testing.T) {
	// When username or password is empty, auth is bypassed.
	s, db := newServer(t, "", "")
	seedArtist(t, db, "a1", "Boards of Canada", "", true)

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200 when auth disabled, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "Boards of Canada") {
		t.Errorf("expected artist rendered, got:\n%s", rec.Body.String())
	}
}

func TestDashboard_SkipsUnmonitored(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "mon", "Monitored Artist", "", true)
	seedArtist(t, db, "unmon", "Unmonitored Artist", "", false)
	seedExternalRelease(t, db, "r1", "unmon", "Should not appear")
	seedExternalRelease(t, db, "r2", "mon", "Missing here")

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	body := rec.Body.String()
	if strings.Contains(body, "Unmonitored Artist") {
		t.Errorf("unmonitored artist should not appear, got:\n%s", body)
	}
	if !strings.Contains(body, "Monitored Artist") {
		t.Errorf("monitored artist should appear, got:\n%s", body)
	}
}

func TestDashboard_EmptyState(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "No monitored artists") {
		t.Errorf("expected empty-state message, got:\n%s", rec.Body.String())
	}
}

func TestDashboard_NotFoundForOtherPaths(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/favicon.ico", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected 404 for non-root path, got %d", rec.Code)
	}
}

func TestArtistDetail_RendersLocalAndMissing(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "mbid-1", true)
	seedLocalAlbum(t, db, "l1", "a1", "OK Computer")
	seedLocalAlbum(t, db, "l2", "a1", "The Bends")
	// One missing release (no local album matches "Kid A").
	seedExternalRelease(t, db, "r1", "a1", "Kid A")

	req := httptest.NewRequest(http.MethodGet, "/artist/a1", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	body := rec.Body.String()
	for _, want := range []string{"Radiohead", "OK Computer", "The Bends", "Kid A", "mbid-1"} {
		if !strings.Contains(body, want) {
			t.Errorf("expected %q in artist page, got:\n%s", want, body)
		}
	}
	if !strings.Contains(body, `name="rgid" value="r1"`) {
		t.Errorf("expected ignore form for r1, got:\n%s", body)
	}
}

func TestArtistDetail_UnknownArtist404(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/artist/does-not-exist", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected 404 for unknown artist, got %d", rec.Code)
	}
}

func TestArtistDetail_BarePath404(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/artist/", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected 404 for bare /artist/, got %d", rec.Code)
	}
}

func TestArtistDetail_RequiresGet(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodPost, "/artist/a1", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 for POST on detail, got %d", rec.Code)
	}
}

func TestArchive_RendersIgnoredReleases(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "", true)
	// An ignored external release.
	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
		RGID:     "r-ignored",
		ArtistID: "a1",
		Title:    "Ignored Album",
		IsIgnored: true,
	}); err != nil {
		t.Fatalf("seed ignored release: %v", err)
	}

	req := httptest.NewRequest(http.MethodGet, "/archive", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	body := rec.Body.String()
	if !strings.Contains(body, "Ignored Album") {
		t.Errorf("expected ignored release in archive, got:\n%s", body)
	}
	if !strings.Contains(body, `name="rgid" value="r-ignored"`) {
		t.Errorf("expected restore form for r-ignored, got:\n%s", body)
	}
}

func TestArchive_EmptyState(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodGet, "/archive", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "No ignored releases") {
		t.Errorf("expected empty archive message, got:\n%s", rec.Body.String())
	}
}

func TestArchive_RequiresGet(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodPost, "/archive", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("expected 405 for POST on archive, got %d", rec.Code)
	}
}

func TestIgnoreAction_SetsFlagAndRemovesFromDashboard(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "", true)
	seedExternalRelease(t, db, "r1", "a1", "Kid A")

	// Before ignore: dashboard shows 1 missing.
	before := dashboardMissingCount(t, s, "Radiohead")
	if before != 1 {
		t.Fatalf("expected 1 missing before ignore, got %d", before)
	}

	// POST ignore.
	form := strings.NewReader("rgid=r1")
	req := httptest.NewRequest(http.MethodPost, "/artist/a1/ignore", form)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusSeeOther {
		t.Fatalf("expected 303 redirect, got %d", rec.Code)
	}
	if loc := rec.Header().Get("Location"); loc != "/artist/a1" {
		t.Errorf("expected redirect to /artist/a1, got %q", loc)
	}

	// Flag persisted.
	rel, err := database.GetExternalRelease(db, "r1")
	if err != nil {
		t.Fatalf("get release: %v", err)
	}
	if !rel.IsIgnored {
		t.Errorf("expected r1 to be ignored")
	}

	// Dashboard missing count drops to 0.
	after := dashboardMissingCount(t, s, "Radiohead")
	if after != 0 {
		t.Fatalf("expected 0 missing after ignore, got %d", after)
	}
}

func TestIgnoreAction_RequiresAuth(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "", true)
	seedExternalRelease(t, db, "r1", "a1", "Kid A")

	form := strings.NewReader("rgid=r1")
	req := httptest.NewRequest(http.MethodPost, "/artist/a1/ignore", form)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 without auth, got %d", rec.Code)
	}
	// Flag must remain unset.
	rel, err := database.GetExternalRelease(db, "r1")
	if err != nil {
		t.Fatalf("get release: %v", err)
	}
	if rel.IsIgnored {
		t.Errorf("release must not be ignored without auth")
	}
}

func TestRestoreAction_ClearsFlag(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "", true)
	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
		RGID:      "r1",
		ArtistID:  "a1",
		Title:     "Kid A",
		IsIgnored: true,
	}); err != nil {
		t.Fatalf("seed ignored release: %v", err)
	}

	form := strings.NewReader("rgid=r1")
	req := httptest.NewRequest(http.MethodPost, "/artist/a1/restore", form)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusSeeOther {
		t.Fatalf("expected 303 redirect, got %d", rec.Code)
	}
	rel, err := database.GetExternalRelease(db, "r1")
	if err != nil {
		t.Fatalf("get release: %v", err)
	}
	if rel.IsIgnored {
		t.Errorf("expected r1 to be restored (not ignored)")
	}
}

func TestIgnoreSingles_TogglesFlag(t *testing.T) {
	s, db := newServer(t, "admin", "secret")
	seedArtist(t, db, "a1", "Radiohead", "", true)

	// Toggle on.
	req := httptest.NewRequest(http.MethodPost, "/artist/a1/ignore-singles", nil)
	req.SetBasicAuth("admin", "secret")
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusSeeOther {
		t.Fatalf("expected 303 on toggle, got %d", rec.Code)
	}
	settings, err := database.GetArtistSettings(db, "a1")
	if err != nil {
		t.Fatalf("get settings: %v", err)
	}
	if !settings.IgnoreSingles {
		t.Errorf("expected ignore_singles = true after first toggle")
	}

	// Toggle off.
	req2 := httptest.NewRequest(http.MethodPost, "/artist/a1/ignore-singles", nil)
	req2.SetBasicAuth("admin", "secret")
	rec2 := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec2, req2)
	settings, err = database.GetArtistSettings(db, "a1")
	if err != nil {
		t.Fatalf("get settings: %v", err)
	}
	if settings.IgnoreSingles {
		t.Errorf("expected ignore_singles = false after second toggle")
	}
}

func TestIgnoreSingles_RequiresAuth(t *testing.T) {
	s, _ := newServer(t, "admin", "secret")

	req := httptest.NewRequest(http.MethodPost, "/artist/a1/ignore-singles", nil)
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 without auth, got %d", rec.Code)
	}
}

// dashboardMissingCount returns the missing-release count for the artist with
// the given name from the dashboard view model (0 if the artist is absent).
func dashboardMissingCount(t *testing.T, s *Server, artistName string) int {
	t.Helper()
	data, err := s.buildDashboardData(context.Background(), 0)
	if err != nil {
		t.Fatalf("build dashboard data: %v", err)
	}
	for _, a := range data.Artists {
		if a.Name == artistName {
			return a.MissingCount
		}
	}
	return 0
}