package component

import (
	"context"
	"net"
	"os"
	"path/filepath"
	"runtime"
	"testing"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/stretchr/testify/require"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/modules/postgres"
	"github.com/testcontainers/testcontainers-go/wait"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/test/bufconn"

	pb "homelab.lan/music-agregator/gen/music_agregator/v1"
	"homelab.lan/music-agregator/internal"
	"homelab.lan/music-agregator/internal/database"
	"homelab.lan/music-agregator/internal/metadata"
)

const bufSize = 1024 * 1024

type testMocks struct {
	metadata *mockMetadataClient
	torrent  *mockTorrentClient
	indexer  *mockSearcher
	magnet   *mockResolver
}

type testSuite struct {
	db       *database.DB
	grpcConn *grpc.ClientConn
	client   pb.MusicAgregatorServiceClient
	pool     *pgxpool.Pool
	mocks    *testMocks
}

func setupSuite(t *testing.T) *testSuite {
	ctx := context.Background()

	schemaPath := getSchemaPath(t)
	schemaSQL, err := os.ReadFile(schemaPath)
	require.NoError(t, err, "failed to read schema file")

	migrationPath := getMigrationPath(t, "003_event_bus.sql")
	migrationSQL, err := os.ReadFile(migrationPath)
	require.NoError(t, err, "failed to read migration file")

	pgContainer, err := postgres.Run(ctx,
		"postgres:16-alpine",
		postgres.WithDatabase("music_agregator_test"),
		postgres.WithUsername("test"),
		postgres.WithPassword("test"),
		postgres.WithInitScripts(),
		testcontainers.WithWaitStrategy(
			wait.ForLog("database system is ready to accept connections").
				WithOccurrence(2).
				WithStartupTimeout(30*time.Second),
		),
	)
	require.NoError(t, err, "failed to start postgres container")

	t.Cleanup(func() {
		if err := pgContainer.Terminate(ctx); err != nil {
			t.Logf("failed to terminate postgres container: %v", err)
		}
	})

	connStr, err := pgContainer.ConnectionString(ctx, "sslmode=disable")
	require.NoError(t, err, "failed to get connection string")

	pool, err := pgxpool.New(ctx, connStr)
	require.NoError(t, err, "failed to create pgxpool")

	t.Cleanup(func() {
		pool.Close()
	})

	_, err = pool.Exec(ctx, string(schemaSQL))
	require.NoError(t, err, "failed to apply schema")

	_, err = pool.Exec(ctx, string(migrationSQL))
	require.NoError(t, err, "failed to apply migration")

	db := &database.DB{Pool: pool}

	mocks := &testMocks{
		metadata: &mockMetadataClient{},
		torrent:  &mockTorrentClient{},
		indexer:  &mockSearcher{},
		magnet:   &mockResolver{},
	}

	metadataSvc := metadata.NewMetadataService(mocks.metadata, db)

	service := internal.NewMusicAgregatorServiceWithDeps(
		metadataSvc,
		mocks.indexer,
		mocks.torrent,
		mocks.magnet,
		nil,
		nil,
		db,
	)

	server := internal.NewMusicAgregatorServerWithService(service)

	lis := bufconn.Listen(bufSize)
	grpcServer := grpc.NewServer()
	server.Register(grpcServer)

	go func() {
		if err := grpcServer.Serve(lis); err != nil {
			t.Logf("grpc server error: %v", err)
		}
	}()

	t.Cleanup(func() {
		grpcServer.GracefulStop()
	})

	conn, err := grpc.NewClient(
		"passthrough://bufnet",
		grpc.WithContextDialer(func(ctx context.Context, _ string) (net.Conn, error) {
			return lis.DialContext(ctx)
		}),
		grpc.WithTransportCredentials(insecure.NewCredentials()),
	)
	require.NoError(t, err, "failed to create grpc client connection")

	t.Cleanup(func() {
		conn.Close()
	})

	client := pb.NewMusicAgregatorServiceClient(conn)

	return &testSuite{
		db:       db,
		grpcConn: conn,
		client:   client,
		pool:     pool,
		mocks:    mocks,
	}
}

func getSchemaPath(t *testing.T) string {
	_, currentFile, _, ok := runtime.Caller(0)
	require.True(t, ok, "failed to get current file path")

	testDir := filepath.Dir(currentFile)
	schemaPath := filepath.Join(testDir, "..", "..", "..", "containers", "database", "music-agregator", "002_schema.sql")

	if _, err := os.Stat(schemaPath); os.IsNotExist(err) {
		schemaPath = filepath.Join(testDir, "..", "..", "containers", "database", "music-agregator", "002_schema.sql")
	}

	return schemaPath
}

func getMigrationPath(t *testing.T, filename string) string {
	_, currentFile, _, ok := runtime.Caller(0)
	require.True(t, ok, "failed to get current file path")

	testDir := filepath.Dir(currentFile)
	migrationPath := filepath.Join(testDir, "..", "..", "..", "containers", "database", "music-agregator", filename)

	if _, err := os.Stat(migrationPath); os.IsNotExist(err) {
		migrationPath = filepath.Join(testDir, "..", "..", "containers", "database", "music-agregator", filename)
	}

	return migrationPath
}

func cleanTables(t *testing.T, pool *pgxpool.Pool) {
	ctx := context.Background()

	tables := []string{
		"album_events",
		"workflow_runs",
		"download_files",
		"downloads",
		"torrents",
		"tracks",
		"albums",
		"artists",
	}

	for _, table := range tables {
		_, err := pool.Exec(ctx, "TRUNCATE TABLE "+table+" CASCADE")
		require.NoError(t, err, "failed to truncate table %s", table)
	}
}