package reacquisition

import (
	"context"
	"io"
	"log/slog"
	"os"
	"testing"

	"github.com/jackc/pgx/v5/pgtype"
	"github.com/jackc/pgx/v5/pgxpool"

	"git.fabledsword.com/bvandeusen/minstrel/internal/db"
	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
	"git.fabledsword.com/bvandeusen/minstrel/internal/dbtest"
	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrconfig"
	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrrequests"
	"git.fabledsword.com/bvandeusen/minstrel/internal/notifications"
	"git.fabledsword.com/bvandeusen/minstrel/internal/tags"
)

func newSweepPool(t *testing.T) *pgxpool.Pool {
	t.Helper()
	if testing.Short() {
		t.Skip("skipping integration test in -short mode")
	}
	dsn := os.Getenv("MINSTREL_TEST_DATABASE_URL")
	if dsn == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	if err := db.Migrate(dsn, slog.New(slog.NewTextHandler(io.Discard, nil))); err != nil {
		t.Fatalf("migrate: %v", err)
	}
	pool, err := pgxpool.New(context.Background(), dsn)
	if err != nil {
		t.Fatalf("pool: %v", err)
	}
	t.Cleanup(pool.Close)
	dbtest.ResetDB(t, pool)
	if _, err := pool.Exec(context.Background(), "DELETE FROM lidarr_requests"); err != nil {
		t.Fatalf("reset requests: %v", err)
	}
	return pool
}

// lostAlbum seeds an album whose only track has been missing for two days,
// named by MusicBrainz release id and (when group is set) release group.
func lostAlbum(t *testing.T, pool *pgxpool.Pool, title, release, group string) pgtype.UUID {
	t.Helper()
	ctx := context.Background()
	q := dbq.New(pool)
	artistMBID := "artist-" + release
	ar, err := q.UpsertArtist(ctx, dbq.UpsertArtistParams{Name: title + " Artist", SortName: title, Mbid: &artistMBID})
	if err != nil {
		t.Fatal(err)
	}
	params := dbq.UpsertAlbumParams{Title: title, SortTitle: title, ArtistID: ar.ID, Mbid: &release}
	if group != "" {
		params.ReleaseGroupMbid = &group
	}
	al, err := q.UpsertAlbum(ctx, params)
	if err != nil {
		t.Fatal(err)
	}
	tr, err := q.UpsertTrack(ctx, dbq.UpsertTrackParams{
		Title: "Lost", AlbumID: al.ID, ArtistID: ar.ID, DurationMs: 180000,
		FilePath: "/music/" + release + "/01.flac", FileSize: 1, FileFormat: "flac",
	})
	if err != nil {
		t.Fatal(err)
	}
	if _, err := pool.Exec(ctx, "UPDATE tracks SET missing_since = now() - interval '2 days' WHERE id = $1", tr.ID); err != nil {
		t.Fatal(err)
	}
	return al.ID
}

// #5241: re-acquisition asks Lidarr for the album's release group, never its
// release id. A tag-supplied group is used as is; otherwise MusicBrainz names
// it and the answer is cached onto the album; an album MusicBrainz cannot
// name is skipped without spending an attempt.
func TestSweep_RequestsAlbumsByReleaseGroup_Integration(t *testing.T) {
	pool := newSweepPool(t)
	ctx := context.Background()
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	q := dbq.New(pool)

	admin, err := q.CreateUser(ctx, dbq.CreateUserParams{
		Username: dbtest.TestUserPrefix + "sweepadmin", PasswordHash: "x", ApiTokenHash: "x", IsAdmin: true,
	})
	if err != nil {
		t.Fatal(err)
	}
	settings, err := NewSettingsService(ctx, pool, logger)
	if err != nil {
		t.Fatal(err)
	}
	cfg := Defaults
	cfg.AutoApprove = false
	if _, err := settings.Set(ctx, cfg); err != nil {
		t.Fatal(err)
	}

	tagged := lostAlbum(t, pool, "Tagged", "release-tagged", "group-tagged")
	resolved := lostAlbum(t, pool, "Resolved", "release-resolved", "")
	unknown := lostAlbum(t, pool, "Unknown", "release-unknown", "")

	requests := lidarrrequests.NewService(pool, lidarrconfig.New(pool), nil, nil)
	s := NewSweeper(pool, settings, requests, logger)
	s.SetNotifier(notifications.New(pool, nil, nil))
	asked := map[string]int{}
	s.releaseGroup = func(_ context.Context, release string) (string, error) {
		asked[release]++
		if release == "release-resolved" {
			return "group-resolved", nil
		}
		return "", tags.ErrNotFound
	}
	if err := s.SweepOnce(ctx); err != nil {
		t.Fatalf("sweep: %v", err)
	}

	requested := func(album pgtype.UUID) (string, bool) {
		t.Helper()
		var mbid *string
		err := pool.QueryRow(ctx, `
SELECT lr.lidarr_album_mbid
  FROM missing_reacquisitions r
  JOIN lidarr_requests lr ON lr.id = r.last_request_id
 WHERE r.album_id = $1`, album).Scan(&mbid)
		if err != nil || mbid == nil {
			return "", false
		}
		return *mbid, true
	}
	if got, ok := requested(tagged); !ok || got != "group-tagged" {
		t.Errorf("tagged album requested as %q (ok=%v), want group-tagged", got, ok)
	}
	if asked["release-tagged"] != 0 {
		t.Error("MusicBrainz asked about an album whose tags named its group")
	}
	if got, ok := requested(resolved); !ok || got != "group-resolved" {
		t.Errorf("resolved album requested as %q (ok=%v), want group-resolved", got, ok)
	}
	var cached *string
	if err := pool.QueryRow(ctx, "SELECT release_group_mbid FROM albums WHERE id = $1", resolved).Scan(&cached); err != nil {
		t.Fatal(err)
	}
	if cached == nil || *cached != "group-resolved" {
		t.Errorf("resolved group not cached on the album: %v", cached)
	}
	var attempts int
	if err := pool.QueryRow(ctx, "SELECT count(*) FROM missing_reacquisitions WHERE album_id = $1", unknown).Scan(&attempts); err != nil {
		t.Fatal(err)
	}
	if attempts != 0 {
		t.Errorf("unresolvable album spent an attempt (%d state rows)", attempts)
	}
	// M489: the two requests filed without auto-approval wait on an admin,
	// so each reaches the admins' inbox; the unresolvable album filed none.
	inbox, err := q.ListNotifications(ctx, dbq.ListNotificationsParams{UserID: admin.ID, PageLimit: 10})
	if err != nil {
		t.Fatal(err)
	}
	if len(inbox) != 2 {
		t.Errorf("admin inbox holds %d notifications, want 2", len(inbox))
	}
	for _, n := range inbox {
		if n.Kind != string(notifications.KindRequestPending) {
			t.Errorf("admin inbox holds %q, want request_pending", n.Kind)
		}
	}
	var stray int
	if err := pool.QueryRow(ctx, "SELECT count(*) FROM lidarr_requests WHERE lidarr_album_mbid LIKE 'release-%'").Scan(&stray); err != nil {
		t.Fatal(err)
	}
	if stray != 0 {
		t.Errorf("%d request(s) named an album by its release id", stray)
	}
}