//go:build integration
// +build integration

package integration

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

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"

	"veza-backend-api/internal/api"
	"veza-backend-api/internal/config"
	"veza-backend-api/internal/core/marketplace"
	"veza-backend-api/internal/database"
	"veza-backend-api/internal/metrics"
	"veza-backend-api/internal/middleware"
	"veza-backend-api/internal/models"
	"veza-backend-api/internal/services"
)

// mockPaymentProvider returns fixed payment_id for CreatePayment (no real Hyperswitch call)
type mockPaymentProvider struct {
	paymentID    string
	clientSecret string
}

func (m *mockPaymentProvider) CreatePayment(_ context.Context, _ int64, _ string, _ string, _ string, _ map[string]string) (string, string, error) {
	return m.paymentID, m.clientSecret, nil
}

func (m *mockPaymentProvider) GetPayment(_ context.Context, _ string) (string, error) {
	return "succeeded", nil
}

// mockTransferService records CreateTransfer calls
type mockTransferService struct {
	calls []struct {
		SellerID uuid.UUID
		Amount   int64
		Currency string
		OrderID  string
	}
}

func (m *mockTransferService) CreateTransfer(_ context.Context, sellerUserID uuid.UUID, amount int64, currency, orderID string) error {
	m.calls = append(m.calls, struct {
		SellerID uuid.UUID
		Amount   int64
		Currency string
		OrderID  string
	}{sellerUserID, amount, currency, orderID})
	return nil
}

// testAuthMiddleware reads X-User-ID header and sets user_id in context (for integration tests)
type testAuthMiddleware struct{}

func (t *testAuthMiddleware) RequireAuth() gin.HandlerFunc {
	return func(c *gin.Context) {
		if userIDStr := c.GetHeader("X-User-ID"); userIDStr != "" {
			if userID, err := uuid.Parse(userIDStr); err == nil {
				c.Set("user_id", userID)
				c.Next()
				return
			}
		}
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
	}
}

func (t *testAuthMiddleware) RequireContentCreatorRole() gin.HandlerFunc {
	return t.RequireAuth()
}

func (t *testAuthMiddleware) RequireOwnershipOrAdmin(_ string, _ middleware.ResourceOwnerResolver) gin.HandlerFunc {
	return t.RequireAuth()
}

func (t *testAuthMiddleware) RequirePermission(_ string) gin.HandlerFunc {
	return t.RequireAuth()
}

func (t *testAuthMiddleware) RequireAdmin() gin.HandlerFunc {
	return t.RequireAuth()
}

func (t *testAuthMiddleware) OptionalAuth() gin.HandlerFunc {
	return func(c *gin.Context) { c.Next() }
}

func (t *testAuthMiddleware) RefreshToken() gin.HandlerFunc {
	return func(c *gin.Context) { c.AbortWithStatus(http.StatusNotImplemented) }
}

func setupPaymentFlowRouter(t *testing.T, db *gorm.DB, marketService *marketplace.Service) *gin.Engine {
	t.Helper()
	os.Setenv("ENABLE_CLAMAV", "false")
	os.Setenv("CLAMAV_REQUIRED", "false")

	gin.SetMode(gin.TestMode)
	router := gin.New()

	sqlDB, err := db.DB()
	require.NoError(t, err)

	vezaDB := &database.Database{
		DB:     sqlDB,
		GormDB: db,
		Logger: zap.NewNop(),
	}

	cfg := &config.Config{
		HyperswitchWebhookSecret:   "test-secret-at-least-32-chars-long",
		JWTSecret:                 "test-jwt-secret-key-minimum-32-characters-long",
		JWTIssuer:                 "veza-api",
		JWTAudience:               "veza-app",
		Logger:                    zap.NewNop(),
		RedisClient:               nil,
		ErrorMetrics:              metrics.NewErrorMetrics(),
		UploadDir:                 "uploads/test",
		Env:                       "development",
		Database:                  vezaDB,
		CORSOrigins:               []string{"*"},
		HandlerTimeout:            30 * time.Second,
		RateLimitLimit:            100,
		RateLimitWindow:           60,
		AuthRateLimitLoginAttempts: 10,
		AuthRateLimitLoginWindow:  15,
		MarketplaceServiceOverride: marketService,
	}
	require.NoError(t, cfg.InitServicesForTest())
	require.NoError(t, cfg.InitMiddlewaresForTest())
	cfg.AuthMiddlewareOverride = &testAuthMiddleware{}

	apiRouter := api.NewAPIRouter(vezaDB, cfg)
	require.NoError(t, apiRouter.Setup(router))
	return router
}

// TestPaymentFlow_E2E_CartCheckoutWebhook verifies the full payment flow:
// add to cart -> checkout -> webhook payment_succeeded -> order completed, license created, transfer initiated
func TestPaymentFlow_E2E_CartCheckoutWebhook(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, db.AutoMigrate(
		&models.User{},
		&models.Track{},
		&marketplace.Product{},
		&marketplace.Order{},
		&marketplace.OrderItem{},
		&marketplace.License{},
		&marketplace.SellerTransfer{},
	))
	// CartItem uses gen_random_uuid() (PostgreSQL) — create manually for SQLite
	require.NoError(t, db.Exec(`
		CREATE TABLE IF NOT EXISTS cart_items (
			id TEXT PRIMARY KEY,
			user_id TEXT NOT NULL,
			product_id TEXT NOT NULL,
			quantity INTEGER DEFAULT 1,
			created_at DATETIME,
			updated_at DATETIME
		)
	`).Error)
	db.Callback().Create().Before("gorm:create").Register("generate_uuid_cart_item", func(d *gorm.DB) {
		if item, ok := d.Statement.Dest.(*marketplace.CartItem); ok && item.ID == uuid.Nil {
			item.ID = uuid.New()
		}
	})

	buyerID := uuid.New()
	sellerID := uuid.New()
	trackID := uuid.New()

	require.NoError(t, db.Create(&models.User{ID: buyerID}).Error)
	require.NoError(t, db.Create(&models.User{ID: sellerID}).Error)
	require.NoError(t, db.Create(&models.Track{ID: trackID, UserID: sellerID, FilePath: "/test.mp3"}).Error)

	product := &marketplace.Product{
		ID:          uuid.New(),
		SellerID:    sellerID,
		Title:       "Test Product",
		Price:       9.99,
		ProductType: "track",
		TrackID:     &trackID,
		Status:      marketplace.ProductStatusActive,
	}
	require.NoError(t, db.Create(product).Error)

	mockPay := &mockPaymentProvider{paymentID: "pay_mock_123", clientSecret: "pi_secret_xxx"}
	mockTransfer := &mockTransferService{}
	storageService := services.NewTrackStorageService("uploads/test", false, zap.NewNop())
	marketService := marketplace.NewService(db, zap.NewNop(), storageService,
		marketplace.WithPaymentProvider(mockPay),
		marketplace.WithHyperswitchConfig(true, "/purchases"),
		marketplace.WithTransferService(mockTransfer, 0.10),
	)

	router := setupPaymentFlowRouter(t, db, marketService)

	// Step 1: Add to cart
	addCartBody, _ := json.Marshal(map[string]interface{}{
		"product_id": product.ID.String(),
		"quantity":   1,
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/commerce/cart/items", bytes.NewReader(addCartBody))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-User-ID", buyerID.String())
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusCreated, w.Code, "add to cart must succeed: %s", w.Body.String())

	// Step 2: Checkout
	req = httptest.NewRequest(http.MethodPost, "/api/v1/commerce/cart/checkout", bytes.NewReader([]byte("{}")))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-User-ID", buyerID.String())
	w = httptest.NewRecorder()
	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusCreated, w.Code, "checkout must succeed: %s", w.Body.String())

	var checkoutResp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &checkoutResp))
	data, ok := checkoutResp["data"].(map[string]interface{})
	require.True(t, ok)
	orderData, ok := data["order"].(map[string]interface{})
	require.True(t, ok)
	orderIDStr, ok := orderData["id"].(string)
	require.True(t, ok)
	assert.NotEmpty(t, data["client_secret"], "client_secret must be present")
	assert.Equal(t, "pay_mock_123", data["payment_id"], "payment_id must match mock")

	// Step 3: Simulate webhook payment_succeeded
	payload, _ := json.Marshal(map[string]string{
		"payment_id": "pay_mock_123",
		"status":     "succeeded",
	})
	signature := computeWebhookSignature(payload, "test-secret-at-least-32-chars-long")
	req = httptest.NewRequest(http.MethodPost, "/api/v1/webhooks/hyperswitch", bytes.NewReader(payload))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-webhook-signature-512", signature)
	w = httptest.NewRecorder()
	router.ServeHTTP(w, req)
	assert.Equal(t, http.StatusOK, w.Code, "webhook must succeed: %s", w.Body.String())

	// Assertions: order completed, license created, transfer initiated
	orderID, _ := uuid.Parse(orderIDStr)
	var order marketplace.Order
	require.NoError(t, db.First(&order, orderID).Error)
	assert.Equal(t, "completed", order.Status)

	var licenses []marketplace.License
	require.NoError(t, db.Where("order_id = ?", orderID).Find(&licenses).Error)
	assert.Len(t, licenses, 1, "must have 1 license")

	assert.Len(t, mockTransfer.calls, 1, "transfer must be initiated")
	assert.Equal(t, sellerID, mockTransfer.calls[0].SellerID)
}