package main

import (
	"bookhoard/internal/config"
	"bookhoard/internal/database"
	"bookhoard/internal/handlers"
	"bookhoard/internal/middleware"
	ratelimit "bookhoard/internal/middleware"
	"bookhoard/internal/router"
	"bookhoard/internal/services"
	"bookhoard/internal/sync"
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/go-playground/validator/v10"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/labstack/echo/v4"
	echomiddleware "github.com/labstack/echo/v4/middleware"
	"github.com/stretchr/testify/require"
)

// CustomValidator wraps the go-playground validator
type CustomValidator struct {
	validator *validator.Validate
}

func (cv *CustomValidator) Validate(i interface{}) error {
	return cv.validator.Struct(i)
}

// Helper functions for testing
func containsPrefix(s, prefix string) bool {
	return len(s) >= len(prefix) && s[:len(prefix)] == prefix
}

func contains(s, substr string) bool {
	return strings.Contains(s, substr)
}

func trimSpace(s string) string {
	return strings.TrimSpace(s)
}

// setupTestServer creates a test server with a test database
// Returns: (*httptest.Server, *database.Queries, *config.Config)
func setupTestServer(t *testing.T) (*httptest.Server, *database.Queries, *config.Config) {
	// Load configuration using the same method as main application
	cfg := config.LoadConfig()

	// Apply test-specific overrides
	cfg.ServerPort = "0" // Use random port for tests
	cfg.BaseURL = "http://localhost"
	cfg.JWTSecret = "test-secret-key"
	cfg.UploadPath = "./test-uploads"
	cfg.TestMode = true
	cfg.RateLimitEnabled = false
	cfg.RequestsPerMinute = 1000

	// Connect to test database using the same method as main application
	dbPool, err := pgxpool.New(context.Background(), cfg.DatabaseURL())
	require.NoError(t, err, "Failed to connect to test database")

	queries := database.New(dbPool)

	// Create login attempt tracker
	loginAttemptTracker := ratelimit.NewLoginAttemptTracker(5, 15*time.Minute, 5*time.Minute)

	// Create handlers
	authHandler := handlers.NewAuthHandler(queries, cfg.JWTSecret, loginAttemptTracker)
	libraryHandler := handlers.NewLibraryHandler(queries)
	deviceHandler := handlers.NewDeviceHandler(queries, cfg.JWTSecret, cfg)
	deviceAuthMiddleware := middleware.NewDeviceAuthMiddleware(queries)

	// Create WebSocket connection manager
	connManager := sync.NewConnectionManager()
	connManager.StartCleanupTask()

	// Create sync queue processor
	queueProcessor := sync.NewSyncQueueProcessor(queries)
	go queueProcessor.Start(context.Background())

	koreaderHandler := handlers.NewKOReaderHandler(queries, connManager, queueProcessor)
	wsHandler := handlers.NewWSHandler(queries, connManager, cfg.JWTSecret, deviceAuthMiddleware)
	conflictHandler := handlers.NewConflictHandler(queries, connManager)
	analyticsHandler := handlers.NewAnalyticsHandler(queries)
	queueHandler := handlers.NewQueueHandler(queries, queueProcessor)

	// Create conversion service for OPDS
	conversionService := services.NewConversionService(queries, "/var/bookhoard/cache/kepub")
	opdsHandler := handlers.NewOPDSHandler(queries, conversionService)

	// Create Echo instance
	e := echo.New()

	// Set up validator
	v := validator.New()
	if err := ratelimit.RegisterPasswordValidation(v); err != nil {
		t.Fatal("Failed to register password validator:", err)
	}
	e.Validator = &CustomValidator{validator: v}

	// Middleware
	e.Use(echomiddleware.Logger())
	e.Use(echomiddleware.Recover())
	e.Use(echomiddleware.CORS())

	// Setup routes using router package
	routerConfig := &router.Config{
		Echo:                 e,
		Queries:              queries,
		Cfg:                  cfg,
		DBPool:               dbPool,
		AuthHandler:          authHandler,
		LibraryHandler:       libraryHandler,
		DeviceHandler:        deviceHandler,
		KOReaderHandler:      koreaderHandler,
		WSHandler:            wsHandler,
		ConflictHandler:      conflictHandler,
		AnalyticsHandler:     analyticsHandler,
		QueueHandler:         queueHandler,
		CollectionHandler:    nil, // Not needed for tests
		OPDSHandler:          opdsHandler,
		ConnManager:          connManager,
		QueueProcessor:       queueProcessor,
		DeviceAuthMiddleware: deviceAuthMiddleware,
		LoginTracker:         loginAttemptTracker,
	}

	router.RegisterRoutes(routerConfig)

	// Create test server
	ts := httptest.NewServer(e)

	// Return server, queries, and config
	return ts, queries, cfg
}

// loginTestUser logs in a test user and returns the JWT token
func loginTestUser(t *testing.T, ts *httptest.Server, db *database.Queries) string {
	// Ensure test user exists first
	_ = getTestUserID(t, db)

	loginRequest := map[string]interface{}{
		"login":    "testuser@example.com",
		"password": "Test@Pass123!",
	}
	body, _ := json.Marshal(loginRequest)

	req, _ := http.NewRequest("POST", ts.URL+"/api/auth/login", bytes.NewBuffer(body))
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{}
	resp, err := client.Do(req)
	require.NoError(t, err, "Failed to login test user")
	defer resp.Body.Close()

	require.Equal(t, http.StatusOK, resp.StatusCode, "Login should succeed")

	var result map[string]interface{}
	json.NewDecoder(resp.Body).Decode(&result)

	token, ok := result["access_token"].(string)
	require.True(t, ok, "Should have access_token")
	require.NotEmpty(t, token, "Access token should not be empty")

	return token
}

func getTestUserID(t *testing.T, db *database.Queries) uuid.UUID {
	ctx := context.Background()

	// Check if test user exists and delete them first to ensure fresh state
	user, err := db.GetUserByEmail(ctx, "testuser@example.com")
	if err == nil {
		// User exists, delete them to ensure fresh password
		err = db.DeleteUser(ctx, user.ID)
		if err != nil {
			// If delete fails (user might be referenced elsewhere), log and continue
			t.Logf("Warning: Could not delete existing test user: %v", err)
		}
	}

	// Create a fresh test user with a valid password
	// Password: "Test@Pass123!" meets complexity requirements
	// This is the bcrypt hash for "Test@Pass123!"
	passwordHash := "$2a$10$JjAtK7PPa1WexQC3AUGe8OXLeuseZ/haN1Mz7emMo6CfOvMiTVXWq"

	newUser, err := db.CreateUser(ctx, database.CreateUserParams{
		Email:        "testuser@example.com",
		Username:     "testuser",
		PasswordHash: passwordHash,
		FirstName:    pgtype.Text{String: "Test", Valid: true},
		LastName:     pgtype.Text{String: "User", Valid: true},
		Role:         "admin",
	})
	require.NoError(t, err, "Failed to create test user")

	userUUID, err := uuid.FromBytes(newUser.ID.Bytes[:])
	require.NoError(t, err, "Failed to parse user UUID")
	return userUUID
}

// createTestEbookID creates a test ebook and returns its ID
func createTestEbookID(t *testing.T, ts *httptest.Server, token string) string {
	// First create a library
	libReq := map[string]interface{}{
		"name":        "Test Library",
		"description": "A test library for ebooks",
		"type":        "ebooks",
	}
	libBody, _ := json.Marshal(libReq)

	req, _ := http.NewRequest("POST", ts.URL+"/api/libraries", bytes.NewBuffer(libBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{}
	resp, err := client.Do(req)
	require.NoError(t, err)
	defer resp.Body.Close()

	require.Equal(t, http.StatusCreated, resp.StatusCode)

	var libResult map[string]interface{}
	json.NewDecoder(resp.Body).Decode(&libResult)

	libData := libResult["id"].(string)

	// Create a test ebook
	ebookReq := map[string]interface{}{
		"library_id": libData,
		"title":      "Test Ebook",
		"author":     "Test Author",
		"file_path":  "/tmp/test.epub",
		"file_size":  1024,
		"mime_type":  "application/epub+zip",
	}
	ebookBody, _ := json.Marshal(ebookReq)

	req2, _ := http.NewRequest("POST", ts.URL+"/api/media-items", bytes.NewBuffer(ebookBody))
	req2.Header.Set("Content-Type", "application/json")
	req2.Header.Set("Authorization", "Bearer "+token)

	resp2, err := client.Do(req2)
	require.NoError(t, err)
	defer resp2.Body.Close()

	require.Equal(t, http.StatusCreated, resp2.StatusCode)

	var ebookResult map[string]interface{}
	json.NewDecoder(resp2.Body).Decode(&ebookResult)

	ebookID := ebookResult["id"].(string)
	return ebookID
}