package handler

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"gorm.io/gorm"

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

// SSR 公开页（2026-07-07 去 Flutter 化）：商品页 /product/:id 与店铺页 /shop/:code
// 由后端直出轻量 HTML；断言内容、OG 标签、敏感字段零暴露、搜索与分页。

func setupPageRouter(db *gorm.DB) *gin.Engine {
	h := NewPublicHandler(db)
	r := gin.New()
	r.Use(gin.Recovery())
	r.GET("/product/:public_id", h.ProductPage)
	r.GET("/shop/:shop_code", h.ShopPage)
	return r
}

func getPage(r *gin.Engine, path string) *httptest.ResponseRecorder {
	req := httptest.NewRequest("GET", path, nil)
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	return w
}

func TestProductPage_SSR(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "PPG01")
	wh := testutil.CreateTestWarehouse(db, shop.ID, "仓")
	r := setupPageRouter(db)

	p := testutil.CreateTestProduct(db, shop.ID, "茅台飞天53度")
	setPublicID(db, p.ID, "pub-ssr-001")
	addInventory(db, shop.ID, wh.ID, p.ID, 6)

	w := getPage(r, "/product/pub-ssr-001")
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Header().Get("Content-Type"), "text/html")
	assert.Equal(t, "no-store", w.Header().Get("Cache-Control"))

	body := w.Body.String()
	// 轻量页：不再是 Flutter 壳
	assert.NotContains(t, body, "flutter_bootstrap")
	assert.NotContains(t, body, `<base href="/app/">`)
	// 内容
	assert.Contains(t, body, "茅台飞天53度")
	assert.Contains(t, body, shop.Name)
	// OG 标签（og:url 指向 SSR 短链）
	assert.Contains(t, body, `property="og:title"`)
	assert.Contains(t, body, "/product/pub-ssr-001")
	// 门店互跳；「在 App 中查看」已移除（2026-07-07 用户拍板）
	assert.Contains(t, body, "/shop/"+shop.Code)
	assert.NotContains(t, body, "/app/product/")
	// 敏感字段零暴露（成本/进价永不出现在公开页）
	for _, s := range []string{"cost", "purchase_price", "profit"} {
		assert.NotContains(t, body, s, "公开页不得出现敏感字段名 %s", s)
	}
}

func TestProductPage_NotFound(t *testing.T) {
	db := testutil.SetupTestDB()
	r := setupPageRouter(db)

	w := getPage(r, "/product/no-such-id")
	// 历史行为保持：HTTP 200 + 友好文案（对爬虫不报错）
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Body.String(), "商品不存在")
}

func TestShopPage_SSR_SearchAndPaging(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SPG01")
	wh := testutil.CreateTestWarehouse(db, shop.ID, "仓")
	r := setupPageRouter(db)

	// 25 个有库存商品 → 2 页；外加一个名称可搜索的
	for i := 0; i < 25; i++ {
		p := testutil.CreateTestProduct(db, shop.ID, "批量酒"+strings.Repeat("x", i%3))
		setPublicID(db, p.ID, "sp-"+strings.Repeat("a", 1)+string(rune('A'+i%26))+strings.Repeat("b", i/26+1))
		addInventory(db, shop.ID, wh.ID, p.ID, 3)
	}
	target := testutil.CreateTestProduct(db, shop.ID, "五粮液普五")
	setPublicID(db, target.ID, "sp-target")
	addInventory(db, shop.ID, wh.ID, target.ID, 2)

	// 第 1 页：20 条 + 下一页链接
	w := getPage(r, "/shop/"+shop.Code)
	assert.Equal(t, http.StatusOK, w.Code)
	body := w.Body.String()
	assert.Contains(t, body, shop.Name)
	assert.Contains(t, body, "26 件")
	assert.Contains(t, body, "page=2")
	assert.Equal(t, 20, strings.Count(body, `class="item"`), "第一页应有 20 张商品卡")
	assert.NotContains(t, body, "flutter_bootstrap")

	// 第 2 页：6 条 + 上一页链接
	w = getPage(r, "/shop/"+shop.Code+"?page=2")
	body = w.Body.String()
	assert.Equal(t, 6, strings.Count(body, `class="item"`))
	assert.Contains(t, body, "上一页")

	// 搜索：只命中目标商品，商品卡链接到 SSR 商品页
	w = getPage(r, "/shop/"+shop.Code+"?q="+urlQueryEscape("五粮液"))
	body = w.Body.String()
	assert.Equal(t, 1, strings.Count(body, `class="item"`))
	assert.Contains(t, body, "/product/sp-target")

	// 搜索无结果：空态文案
	w = getPage(r, "/shop/"+shop.Code+"?q=NOPE")
	assert.Contains(t, w.Body.String(), "没有找到")
}

func TestShopPage_NotFound(t *testing.T) {
	db := testutil.SetupTestDB()
	r := setupPageRouter(db)
	w := getPage(r, "/shop/NOSHOP")
	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Body.String(), "店铺不存在")
}

// API 与 SSR 共用装配后的回归：ListShopProducts 行为不变（不受 keyword 影响）
func TestListShopProducts_UnaffectedByRefactor(t *testing.T) {
	db := testutil.SetupTestDB()
	shop := testutil.CreateTestShop(db, "SPG02")
	wh := testutil.CreateTestWarehouse(db, shop.ID, "仓")
	p := testutil.CreateTestProduct(db, shop.ID, "剑南春")
	setPublicID(db, p.ID, "sp2-x")
	addInventory(db, shop.ID, wh.ID, p.ID, 1)
	r := setupPublicRouter(db)

	w := getPage(r, "/api/v1/public/shops/"+shop.Code+"/products")
	assert.Equal(t, http.StatusOK, w.Code)
	resp := parseResponse(w)
	assert.Equal(t, float64(1), resp["total"].(float64))
}

func urlQueryEscape(s string) string {
	// 测试用最小转义（仅中文场景）
	var b strings.Builder
	for _, c := range []byte(s) {
		b.WriteString("%")
		const hex = "0123456789ABCDEF"
		b.WriteByte(hex[c>>4])
		b.WriteByte(hex[c&0xF])
	}
	return b.String()
}