package server

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

	"music-server/internal/backend"
	"music-server/internal/db"
	"music-server/internal/db/repository"

	"github.com/labstack/echo/v5"
	"github.com/stretchr/testify/require"
)

// TestStatisticsEndpoints tests the statistics API endpoints
func TestStatisticsEndpoints(t *testing.T) {
	// Skip if test database not configured
	e := StartTestServer(t)
	if e == nil {
		t.Skip("Test database not configured")
	}

	// Get token first
	token := getTestToken(t, e)
	if token == "" {
		t.Skip("Could not get test token")
	}

	// Test /api/v1/statistics/summary
	req := httptest.NewRequest(http.MethodGet, "/api/v1/statistics/summary", nil)
	req.Header.Set("Authorization", "Bearer "+token)
	rec := httptest.NewRecorder()
	e.ServeHTTP(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)

	var summary backend.StatisticsSummary
	err := json.Unmarshal(rec.Body.Bytes(), &summary)
	require.NoError(t, err)
	require.NotNil(t, summary)
}

// TestPartialMigrationThenSyncThenComplete tests migration workflow
// Note: This test requires the database to be in a specific state
// It tests: partial migration → data insert → sync → complete migration
func TestPartialMigrationThenSyncThenComplete(t *testing.T) {
	// This test is complex and requires careful setup
	// For now, we test the final state: all migrations + sync

	e := StartTestServer(t)
	if e == nil {
		t.Skip("Test database not configured")
	}

	// Get token
	token := getTestToken(t, e)
	if token == "" {
		t.Skip("Could not get test token")
	}

	// Insert test data manually (5 soundtracks with songs)
	insertTestData(t)

	// Run sync to ensure data is properly loaded
	req := httptest.NewRequest(http.MethodGet, "/sync/new", nil)
	req.Header.Set("Authorization", "Bearer "+token)
	rec := httptest.NewRecorder()
	e.ServeHTTP(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)

	// Wait for sync to complete
	if !waitForSyncCompletion(t, e, 60) {
		t.Error("Sync did not complete within timeout")
	}

	// Verify data via statistics endpoint
	req = httptest.NewRequest(http.MethodGet, "/api/v1/statistics/summary", nil)
	req.Header.Set("Authorization", "Bearer "+token)
	rec = httptest.NewRecorder()
	e.ServeHTTP(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)

	var summary backend.StatisticsSummary
	err := json.Unmarshal(rec.Body.Bytes(), &summary)
	require.NoError(t, err)

	// After sync with /sync/new, only soundtracks matching filesystem remain
	// testMusic has 3 games
	require.Equal(t, int64(3), summary.TotalGames)
}

// insertTestData inserts 5 test soundtracks with songs into the database
func insertTestData(t *testing.T) {
	if db.TestDatabase == nil || db.TestDatabase.Pool == nil {
		t.Skip("Test database not initialized")
		return
	}

	ctx := context.Background()
	queries := repository.New(db.TestDatabase.Pool)

	// Insert 5 soundtracks
	soundtracks := []struct {
		name string
		path string
	}{
		{"Test Soundtrack 1", "/path/to/soundtrack1"},
		{"Test Soundtrack 2", "/path/to/soundtrack2"},
		{"Test Soundtrack 3", "/path/to/soundtrack3"},
		{"Test Soundtrack 4", "/path/to/soundtrack4"},
		{"Test Soundtrack 5", "/path/to/soundtrack5"},
	}

	for _, st := range soundtracks {
		_, err := queries.InsertSoundtrack(ctx, repository.InsertSoundtrackParams{
			SoundtrackName: st.name,
			Path:           st.path,
			Hash:           "test-hash-" + st.name,
		})
		require.NoError(t, err, "Failed to insert soundtrack: %s", st.name)
	}

	// Get soundtrack IDs
	soundtrackIDs, err := queries.FindAllSoundtracks(ctx)
	require.NoError(t, err)
	require.GreaterOrEqual(t, len(soundtrackIDs), 5)

	// Insert songs for each soundtrack
	songData := []struct {
		soundtrackID int32
		songs        []string
	}{
		{soundtrackIDs[0].ID, []string{"Song A", "Song B"}},
		{soundtrackIDs[1].ID, []string{"Song C", "Song D"}},
		{soundtrackIDs[2].ID, []string{"Song E"}},
		{soundtrackIDs[3].ID, []string{"Song F", "Song G", "Song H"}},
		{soundtrackIDs[4].ID, []string{"Song I"}},
	}

	for _, sd := range songData {
		for _, songName := range sd.songs {
			err := queries.AddSong(ctx, repository.AddSongParams{
				SoundtrackID: sd.soundtrackID,
				SongName:     songName,
				Path:         "/path/to/" + songName + ".mp3",
			})
			require.NoError(t, err, "Failed to insert song: %s", songName)
		}
	}

	t.Logf("Inserted %d soundtracks with %d total songs", len(soundtracks), 8)
}

// getTestToken gets a valid token for testing
func getTestToken(t *testing.T, e *echo.Echo) string {
	reqBody := `{"client_type": "test"}`
	req := httptest.NewRequest(http.MethodPost, "/api/v1/token", strings.NewReader(reqBody))
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()
	e.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Logf("Failed to get token: %s", rec.Body.String())
		return ""
	}

	var resp struct {
		Token string `json:"token"`
	}
	err := json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)
	return resp.Token
}