package handler

import (
	"fmt"
	"net/http"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/wangjia/jiu/backend/internal/model"
	"github.com/wangjia/jiu/backend/testutil"
)

func TestStockOutHandler_FullFlow(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO001")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Main")
	product := testutil.CreateTestProduct(db, shop.ID, "Whiskey")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	// 先建立库存
	db.Create(&model.Inventory{
		ShopID:      shop.ID,
		WarehouseID: &warehouse.ID,
		ProductID:   &product.ID,
		Quantity:    100,
	})

	// 1. 创建出库单
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"warehouse_id": warehouse.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items": []map[string]interface{}{
			{
				"product_id": product.ID,
				"quantity":   15.0,
				"unit_price": 20.0,
			},
		},
	})
	require.Equal(t, http.StatusCreated, w.Code)
	orderID := extractID(w)
	assert.NotZero(t, orderID)

	data := parseResponse(w)["data"].(map[string]interface{})
	assert.Equal(t, "draft", data["status"])
	assert.NotEmpty(t, data["order_no"])

	// 2. 提交
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/submit", orderID), token, nil)
	require.Equal(t, http.StatusOK, w.Code)

	// 3. 获取详情
	w = makeRequest(r, "GET", fmt.Sprintf("/api/v1/stock-out/orders/%d", orderID), token, nil)
	require.Equal(t, http.StatusOK, w.Code)
	detailData := parseResponse(w)["data"].(map[string]interface{})
	assert.Equal(t, "pending", detailData["status"])

	// 4. 审核通过
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/approve", orderID), token, nil)
	require.Equal(t, http.StatusOK, w.Code)

	// 5. 验证库存减少
	var inv model.Inventory
	db.Where("shop_id = ? AND warehouse_id = ? AND product_id = ?",
		shop.ID, warehouse.ID, product.ID).First(&inv)
	assert.Equal(t, float64(85), inv.Quantity)
}

func TestStockOutHandler_InsufficientStock(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO002")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
	product := testutil.CreateTestProduct(db, shop.ID, "Vodka")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	// 库存只有 5
	db.Create(&model.Inventory{
		ShopID:      shop.ID,
		WarehouseID: &warehouse.ID,
		ProductID:   &product.ID,
		Quantity:    5,
	})

	// 创建出库单要出 10
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"warehouse_id": warehouse.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items": []map[string]interface{}{
			{"product_id": product.ID, "quantity": 10.0},
		},
	})
	orderID := extractID(w)
	makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/submit", orderID), token, nil)

	// 审核应该失败
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/approve", orderID), token, nil)
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestStockOutHandler_List(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO003")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
	product := testutil.CreateTestProduct(db, shop.ID, "Beer")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	// 先建立库存
	db.Create(&model.Inventory{ShopID: shop.ID, WarehouseID: &warehouse.ID, ProductID: &product.ID, Quantity: 100})

	// 创建 2 个出库单
	for i := 0; i < 2; i++ {
		makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
			"warehouse_id": warehouse.ID,
			"order_date":   time.Now().Format(time.RFC3339),
			"items": []map[string]interface{}{
				{"product_id": product.ID, "quantity": 1.0},
			},
		})
	}

	w := makeRequest(r, "GET", "/api/v1/stock-out/orders", token, nil)
	assert.Equal(t, http.StatusOK, w.Code)
	resp := parseResponse(w)
	assert.Equal(t, float64(2), resp["total"].(float64))
}

func TestStockOutHandler_Reject(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO004")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
	product := testutil.CreateTestProduct(db, shop.ID, "Rum")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	db.Create(&model.Inventory{ShopID: shop.ID, WarehouseID: &warehouse.ID, ProductID: &product.ID, Quantity: 100})

	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"warehouse_id": warehouse.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items": []map[string]interface{}{
			{"product_id": product.ID, "quantity": 5.0},
		},
	})
	orderID := extractID(w)
	makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/submit", orderID), token, nil)

	// 驳回
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/reject", orderID), token, nil)
	assert.Equal(t, http.StatusOK, w.Code)

	// 验证状态
	w = makeRequest(r, "GET", fmt.Sprintf("/api/v1/stock-out/orders/%d", orderID), token, nil)
	detailData := parseResponse(w)["data"].(map[string]interface{})
	assert.Equal(t, "rejected", detailData["status"])
}

func TestStockOutHandler_GetNotFound(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO005")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	w := makeRequest(r, "GET", "/api/v1/stock-out/orders/99999", token, nil)
	assert.Equal(t, http.StatusNotFound, w.Code)
}

func TestStockOutHandler_NoAuth(t *testing.T) {
	db := testutil.SetupTestDB()
	r := setupProtectedRouter(db)

	w := makeRequest(r, "GET", "/api/v1/stock-out/orders", "", nil)
	assert.Equal(t, http.StatusUnauthorized, w.Code)

	w = makeRequest(r, "POST", "/api/v1/stock-out/orders", "", map[string]interface{}{
		"warehouse_id": 1,
	})
	assert.Equal(t, http.StatusUnauthorized, w.Code)
}

func TestStockOutHandler_TenantIsolation(t *testing.T) {
	db := testutil.SetupTestDB()

	shopA := testutil.CreateTestShop(db, "SO_A")
	userA := testutil.CreateTestUser(db, shopA.ID, "adminA", "pass", "admin")
	warehouseA := testutil.CreateTestWarehouse(db, shopA.ID, "WA")
	productA := testutil.CreateTestProduct(db, shopA.ID, "BrandyA")
	tokenA := getAuthToken(userA.ID, shopA.ID, "admin")

	shopB := testutil.CreateTestShop(db, "SO_B")
	userB := testutil.CreateTestUser(db, shopB.ID, "adminB", "pass", "admin")
	tokenB := getAuthToken(userB.ID, shopB.ID, "admin")

	r := setupProtectedRouter(db)

	// 建立门店 A 的库存
	db.Create(&model.Inventory{
		ShopID:      shopA.ID,
		WarehouseID: &warehouseA.ID,
		ProductID:   &productA.ID,
		Quantity:    50,
	})

	// 门店 A 创建出库单
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", tokenA, map[string]interface{}{
		"warehouse_id": warehouseA.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items": []map[string]interface{}{
			{"product_id": productA.ID, "quantity": 5.0},
		},
	})
	require.Equal(t, http.StatusCreated, w.Code)
	orderAID := extractID(w)

	// 门店 B 看不到门店 A 的出库单
	w = makeRequest(r, "GET", "/api/v1/stock-out/orders", tokenB, nil)
	resp := parseResponse(w)
	assert.Equal(t, float64(0), resp["total"].(float64))

	// 门店 B 不能获取门店 A 的出库单详情
	w = makeRequest(r, "GET", fmt.Sprintf("/api/v1/stock-out/orders/%d", orderAID), tokenB, nil)
	assert.Equal(t, http.StatusNotFound, w.Code)

	// 门店 B 不能提交门店 A 的出库单
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/submit", orderAID), tokenB, nil)
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestStockOutHandler_Create_MissingWarehouse(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO006")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	// 缺少 warehouse_id（必填）
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"order_date": time.Now().Format(time.RFC3339),
	})
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestStockOutHandler_Approve_NotPending(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO007")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
	product := testutil.CreateTestProduct(db, shop.ID, "Cognac")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	db.Create(&model.Inventory{ShopID: shop.ID, WarehouseID: &warehouse.ID, ProductID: &product.ID, Quantity: 50})

	// 创建但不提交
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"warehouse_id": warehouse.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items": []map[string]interface{}{
			{"product_id": product.ID, "quantity": 5.0},
		},
	})
	orderID := extractID(w)

	// 直接审核（应该失败，因为是 draft 状态）
	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/approve", orderID), token, nil)
	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestStockOutHandler_InventoryLog_OnApprove(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SO008")
	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
	product := testutil.CreateTestProduct(db, shop.ID, "Moutai")
	token := getAuthToken(user.ID, shop.ID, "admin")
	r := setupProtectedRouter(db)

	db.Create(&model.Inventory{ShopID: shop.ID, WarehouseID: &warehouse.ID, ProductID: &product.ID, Quantity: 100})

	// 创建、提交、审核
	w := makeRequest(r, "POST", "/api/v1/stock-out/orders", token, map[string]interface{}{
		"warehouse_id": warehouse.ID,
		"order_date":   time.Now().Format(time.RFC3339),
		"items":        []map[string]interface{}{{"product_id": product.ID, "quantity": 20.0}},
	})
	orderID := extractID(w)
	makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/submit", orderID), token, nil)
	makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-out/orders/%d/approve", orderID), token, nil)

	// 验证库存流水
	var logs []model.InventoryLog
	db.Where("shop_id = ? AND product_id = ? AND direction = 'out'", shop.ID, product.ID).Find(&logs)
	require.Len(t, logs, 1)
	assert.Equal(t, float64(20), logs[0].Quantity)
	assert.Equal(t, float64(100), logs[0].QtyBefore)
	assert.Equal(t, float64(80), logs[0].QtyAfter)
}