package integration

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
	"time"

	"wish-list-api/api/handlers"
	"wish-list-api/api/middleware"
	"wish-list-api/pkg/auth"
	"wish-list-api/pkg/entities"
	"wish-list-api/pkg/user"
	wishlist "wish-list-api/pkg/wish-list"

	"github.com/gofiber/fiber/v2"
	"github.com/golang-jwt/jwt/v5"
	"github.com/stretchr/testify/assert"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

var (
	app     *fiber.App
	testDB  *mongo.Database
	client  *mongo.Client
	authSvc auth.Service
)

func TestMain(m *testing.M) {
	setup()

	exitCode := m.Run()

	teardown()

	os.Exit(exitCode)
}

func setup() {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	var err error
	mongoURI := os.Getenv("MONGODB_URI")
	if mongoURI == "" {
		mongoURI = "mongodb://mongo_user:mongo_password@localhost:27017/admin"
	}

	client, err = mongo.Connect(ctx, options.Client().ApplyURI(mongoURI))
	if err != nil {
		log.Fatalf("Error connecting to MongoDB: %v", err)
	}

	err = client.Ping(ctx, nil)
	if err != nil {
		log.Fatalf("Could not connect to MongoDB: %v", err)
	}

	dbName := fmt.Sprintf("wishlist_test_%d", time.Now().UnixNano())
	testDB = client.Database(dbName)

	userCollection := testDB.Collection("users")
	wishlistCollection := testDB.Collection("wishlists")
	wishlistItemCollection := testDB.Collection("wishlist_items")

	userRepo := user.NewMongoRepository(userCollection)
	wishlistRepo := wishlist.NewMongoRepository(wishlistCollection, wishlistItemCollection)

	userService := user.NewService(userRepo)

	authSvc = auth.NewService(auth.ServiceConfig{
		UserService: userService,
	})

	wishlistSvc := wishlist.NewService(wishlistRepo)

	app = fiber.New()

	api := app.Group("/api")

	api.Post("/auth/register", handlers.Register(authSvc))
	api.Post("/auth/login", handlers.Login(authSvc))
	api.Post("/auth/refresh", handlers.RefreshToken(authSvc))

	wishListHandler := handlers.NewWishListHandler(wishlistSvc, authSvc)

	wishList := api.Group("/wishlist")

	wishList.Get("/:id", wishListHandler.GetWishList)

	wishList.Get("/user/:userId", wishListHandler.GetUserWishLists)

	wishList.Get("/:wishlistId/items", wishListHandler.GetWishListItems)

	wishList.Get("/item/:id", wishListHandler.GetWishListItem)

	wishList.Post("/", middleware.Protected(authSvc), wishListHandler.CreateWishList)
	wishList.Put("/:id", middleware.Protected(authSvc), wishListHandler.UpdateWishList)
	wishList.Delete("/:id", middleware.Protected(authSvc), wishListHandler.DeleteWishList)

	wishList.Post("/item", middleware.Protected(authSvc), wishListHandler.CreateWishListItem)
	wishList.Put("/item/:id", middleware.Protected(authSvc), wishListHandler.UpdateWishListItem)
	wishList.Delete("/item/:id", middleware.Protected(authSvc), wishListHandler.DeleteWishListItem)
}

func teardown() {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	if err := testDB.Drop(ctx); err != nil {
		log.Printf("Error dropping test database: %v", err)
	}

	if err := client.Disconnect(ctx); err != nil {
		log.Printf("Error disconnecting from MongoDB: %v", err)
	}
}

func registerTestUser(t *testing.T) (string, primitive.ObjectID) {
	userData := entities.RegisterRequest{
		Email:    fmt.Sprintf("test%d@example.com", time.Now().UnixNano()),
		Password: "password123",
	}

	jsonBody, _ := json.Marshal(userData)
	req := httptest.NewRequest("POST", "/api/auth/register", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	var response struct {
		Status bool               `json:"status"`
		Data   entities.TokenPair `json:"data"`
		Error  *string            `json:"error"`
	}

	err = json.NewDecoder(resp.Body).Decode(&response)
	assert.NoError(t, err)

	claims, err := authSvc.ValidateToken(response.Data.AccessToken)
	assert.NoError(t, err)

	mapClaims := claims.Claims.(jwt.MapClaims)
	userIDStr := mapClaims["user_id"].(string)
	userID, err := primitive.ObjectIDFromHex(userIDStr)
	assert.NoError(t, err)

	return response.Data.AccessToken, userID
}

func TestRegister(t *testing.T) {
	userData := entities.RegisterRequest{
		Email:    fmt.Sprintf("test%d@example.com", time.Now().UnixNano()),
		Password: "password123",
	}

	jsonBody, _ := json.Marshal(userData)
	req := httptest.NewRequest("POST", "/api/auth/register", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("POST", "/api/auth/register", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusConflict, resp.StatusCode)
}

func TestLogin(t *testing.T) {
	email := fmt.Sprintf("test%d@example.com", time.Now().UnixNano())
	userData := entities.RegisterRequest{
		Email:    email,
		Password: "password123",
	}

	jsonBody, _ := json.Marshal(userData)
	req := httptest.NewRequest("POST", "/api/auth/register", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err := app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	loginData := entities.LoginRequest{
		Email:    email,
		Password: "password123",
	}

	jsonBody, _ = json.Marshal(loginData)
	req = httptest.NewRequest("POST", "/api/auth/login", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	loginData.Password = "wrongpassword"
	jsonBody, _ = json.Marshal(loginData)
	req = httptest.NewRequest("POST", "/api/auth/login", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)
}

func TestWishListCRUD(t *testing.T) {
	token, userID := registerTestUser(t)

	wishlistData := entities.WishList{
		Title:       "Test Wishlist",
		Description: "Integration test wishlist",
		IsPublic:    true,
	}

	jsonBody, _ := json.Marshal(wishlistData)
	req := httptest.NewRequest("POST", "/api/wishlist", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	resp, err := app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusCreated, resp.StatusCode)

	var createResponse struct {
		Status bool              `json:"status"`
		Data   entities.WishList `json:"data"`
		Error  *string           `json:"error"`
	}

	err = json.NewDecoder(resp.Body).Decode(&createResponse)
	assert.NoError(t, err)
	wishlistID := createResponse.Data.ID

	req = httptest.NewRequest("GET", "/api/wishlist/"+wishlistID, nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	updatedData := entities.WishList{
		Title:       "Updated Title",
		Description: "Updated description",
		IsPublic:    false,
	}

	jsonBody, _ = json.Marshal(updatedData)
	req = httptest.NewRequest("PUT", "/api/wishlist/"+wishlistID, bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/"+wishlistID, nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/"+wishlistID, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/user/"+userID.Hex(), nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("DELETE", "/api/wishlist/"+wishlistID, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/"+wishlistID, nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
}

func TestWishListItemsCRUD(t *testing.T) {
	token, _ := registerTestUser(t)

	wishlistData := entities.WishList{
		Title:       "Test Wishlist for Items",
		Description: "Testing wishlist items",
		IsPublic:    true,
	}

	jsonBody, _ := json.Marshal(wishlistData)
	req := httptest.NewRequest("POST", "/api/wishlist", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	resp, err := app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusCreated, resp.StatusCode)

	var createResponse struct {
		Status bool              `json:"status"`
		Data   entities.WishList `json:"data"`
		Error  *string           `json:"error"`
	}

	err = json.NewDecoder(resp.Body).Decode(&createResponse)
	assert.NoError(t, err)
	wishlistID := createResponse.Data.ID

	itemData := entities.WishListItem{
		Title:       "Test Item",
		Description: "Test item description",
		URL:         "https://example.com",
		Cost:        99.99,
		WishListID:  wishlistID,
	}

	jsonBody, _ = json.Marshal(itemData)
	req = httptest.NewRequest("POST", "/api/wishlist/item", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusCreated, resp.StatusCode)

	var itemResponse struct {
		Status bool                  `json:"status"`
		Data   entities.WishListItem `json:"data"`
		Error  *string               `json:"error"`
	}

	err = json.NewDecoder(resp.Body).Decode(&itemResponse)
	assert.NoError(t, err)
	itemID := itemResponse.Data.ID

	req = httptest.NewRequest("GET", "/api/wishlist/item/"+itemID, nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	updatedItemData := entities.WishListItem{
		Title:       "Updated Item Title",
		Description: "Updated item description",
		URL:         "https://example.com",
		Cost:        149.99,
	}

	jsonBody, _ = json.Marshal(updatedItemData)
	req = httptest.NewRequest("PUT", "/api/wishlist/item/"+itemID, bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/"+wishlistID+"/items", nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	var itemsResponse struct {
		Status bool                    `json:"status"`
		Data   []entities.WishListItem `json:"data"`
		Error  *string                 `json:"error"`
	}

	err = json.NewDecoder(resp.Body).Decode(&itemsResponse)
	assert.NoError(t, err)
	assert.Equal(t, 1, len(itemsResponse.Data))

	req = httptest.NewRequest("DELETE", "/api/wishlist/item/"+itemID, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	req = httptest.NewRequest("GET", "/api/wishlist/item/"+itemID, nil)
	resp, err = app.Test(req, -1)
	assert.NoError(t, err)
	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
}