package chat

import (
	"testing"
	"time"

	"hfb_sys/backend/internal/database"
	"hfb_sys/backend/internal/model"

	"gorm.io/gorm"
)

func setupConversationTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	db := database.NewTestDB()
	if err := database.AutoMigrateIfMissing(db,
		&model.User{},
		&model.RentalOrder{},
		&model.ChatConversation{},
		&model.ChatParticipant{},
		&model.ChatAdminConversationState{},
		&model.ChatMessage{},
		&model.DistributionSite{},
	); err != nil {
		t.Fatalf("数据库迁移失败: %v", err)
	}
	return db
}

func TestFindOrderConversationPrefersListingGroup(t *testing.T) {
	db := setupConversationTestDB(t)
	repo := NewRepository(db, nil, nil)
	now := time.Date(2026, 6, 18, 12, 0, 0, 0, time.UTC)

	owner := model.User{Phone: "13800001001", Nickname: "号主"}
	renter := model.User{Phone: "13800001002", Nickname: "租客"}
	if err := db.Create(&owner).Error; err != nil {
		t.Fatalf("创建号主失败: %v", err)
	}
	if err := db.Create(&renter).Error; err != nil {
		t.Fatalf("创建租客失败: %v", err)
	}

	order := model.RentalOrder{
		OrderNo:   "ORDER-LISTING-GROUP",
		ListingID: 101,
		AccountID: 201,
		OwnerID:   owner.ID,
		RenterID:  renter.ID,
		Status:    "renting",
	}
	if err := db.Create(&order).Error; err != nil {
		t.Fatalf("创建订单失败: %v", err)
	}
	orderConv := model.ChatConversation{
		OrderID: &order.ID,
		Type:    ConversationTypeOrderGroup,
		Title:   "旧订单群",
		Status:  "active",
	}
	listingConv := model.ChatConversation{
		ListingID: &order.ListingID,
		Type:      ConversationTypeListingGroup,
		Title:     "发布群",
		Status:    "active",
	}
	if err := db.Create(&orderConv).Error; err != nil {
		t.Fatalf("创建订单群失败: %v", err)
	}
	if err := db.Create(&listingConv).Error; err != nil {
		t.Fatalf("创建发布群失败: %v", err)
	}
	participants := []model.ChatParticipant{
		{ConversationID: orderConv.ID, ParticipantType: "user", ParticipantID: order.RenterID, Role: "renter", JoinedAt: now},
		{ConversationID: listingConv.ID, ParticipantType: "user", ParticipantID: order.RenterID, Role: "renter", JoinedAt: now},
	}
	if err := db.Create(&participants).Error; err != nil {
		t.Fatalf("创建成员失败: %v", err)
	}

	dto, err := repo.FindOrderConversation(t.Context(), order.RenterID, order.ID)
	if err != nil {
		t.Fatalf("查询订单会话失败: %v", err)
	}
	if dto.ID != listingConv.ID {
		t.Fatalf("会话 ID = %d, want 发布群 %d", dto.ID, listingConv.ID)
	}
	if dto.Type != ConversationTypeListingGroup {
		t.Fatalf("会话类型 = %q, want %q", dto.Type, ConversationTypeListingGroup)
	}
}

func TestFindOrderConversationFallsBackToOrderGroup(t *testing.T) {
	db := setupConversationTestDB(t)
	repo := NewRepository(db, nil, nil)
	now := time.Date(2026, 6, 18, 12, 0, 0, 0, time.UTC)

	owner := model.User{Phone: "13800001003", Nickname: "号主"}
	renter := model.User{Phone: "13800001004", Nickname: "租客"}
	if err := db.Create(&owner).Error; err != nil {
		t.Fatalf("创建号主失败: %v", err)
	}
	if err := db.Create(&renter).Error; err != nil {
		t.Fatalf("创建租客失败: %v", err)
	}

	order := model.RentalOrder{
		OrderNo:   "ORDER-LEGACY-GROUP",
		ListingID: 102,
		AccountID: 202,
		OwnerID:   owner.ID,
		RenterID:  renter.ID,
		Status:    "renting",
	}
	if err := db.Create(&order).Error; err != nil {
		t.Fatalf("创建订单失败: %v", err)
	}
	orderConv := model.ChatConversation{
		OrderID: &order.ID,
		Type:    ConversationTypeOrderGroup,
		Title:   "旧订单群",
		Status:  "active",
	}
	if err := db.Create(&orderConv).Error; err != nil {
		t.Fatalf("创建订单群失败: %v", err)
	}
	participant := model.ChatParticipant{
		ConversationID:  orderConv.ID,
		ParticipantType: "user",
		ParticipantID:   order.RenterID,
		Role:            "renter",
		JoinedAt:        now,
	}
	if err := db.Create(&participant).Error; err != nil {
		t.Fatalf("创建成员失败: %v", err)
	}

	dto, err := repo.FindOrderConversation(t.Context(), order.RenterID, order.ID)
	if err != nil {
		t.Fatalf("查询订单会话失败: %v", err)
	}
	if dto.ID != orderConv.ID {
		t.Fatalf("会话 ID = %d, want 订单群 %d", dto.ID, orderConv.ID)
	}
	if dto.Type != ConversationTypeOrderGroup {
		t.Fatalf("会话类型 = %q, want %q", dto.Type, ConversationTypeOrderGroup)
	}
}

func TestChatTenantIsolation(t *testing.T) {
	db := setupConversationTestDB(t)
	repo := NewRepository(db, nil, nil)
	now := time.Now()

	user := model.User{Phone: "13900002001", Nickname: "分销用户"}
	if err := db.Create(&user).Error; err != nil {
		t.Fatalf("创建用户失败: %v", err)
	}

	site := model.DistributionSite{
		ID:       20,
		SiteCode: "site_beta",
		SiteName: "贝塔分销",
		Domain:   "beta.hfb.com",
		Status:   "active",
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatalf("创建分销站点失败: %v", err)
	}

	// 1. 创建主站客服会话
	mainConv := model.ChatConversation{
		Type:         ConversationTypeGeneralSupport,
		SupportScene: SupportSceneGeneral,
		Title:        "主站客服",
		Status:       "active",
	}
	if err := db.Create(&mainConv).Error; err != nil {
		t.Fatalf("创建主站客服会话失败: %v", err)
	}
	if err := db.Create(&model.ChatParticipant{
		ConversationID:  mainConv.ID,
		ParticipantType: "user",
		ParticipantID:   user.ID,
		Role:            "customer",
		JoinedAt:        now,
	}).Error; err != nil {
		t.Fatalf("添加主站会话成员失败: %v", err)
	}

	// 2. 创建分销站客服会话
	siteConv := model.ChatConversation{
		DistributionSiteID: &site.ID,
		Type:               ConversationTypeGeneralSupport,
		SupportScene:       SupportSceneGeneral,
		Title:              "【贝塔分销】平台客服",
		Status:             "active",
	}
	if err := db.Create(&siteConv).Error; err != nil {
		t.Fatalf("创建分站客服会话失败: %v", err)
	}
	if err := db.Create(&model.ChatParticipant{
		ConversationID:  siteConv.ID,
		ParticipantType: "user",
		ParticipantID:   user.ID,
		Role:            "customer",
		JoinedAt:        now,
	}).Error; err != nil {
		t.Fatalf("添加分站会话成员失败: %v", err)
	}

	principal := Principal{Type: "user", ID: user.ID}

	// 3. 校验主站查询会话列表：严格只看到主站会话
	mainList, err := repo.ListConversations(t.Context(), principal, 1, 20)
	if err != nil {
		t.Fatalf("查询主站会话列表失败: %v", err)
	}
	if mainList.Total != 1 {
		t.Fatalf("主站会话数量 = %d, want 1", mainList.Total)
	}
	mainItems := mainList.Items.([]ConversationDTO)
	if mainItems[0].ID != mainConv.ID {
		t.Fatalf("主站会话 ID = %d, want %d", mainItems[0].ID, mainConv.ID)
	}
	if mainItems[0].DistributionSiteID != nil {
		t.Fatalf("主站会话 DistributionSiteID = %v, want nil", mainItems[0].DistributionSiteID)
	}

	// 4. 校验分站查询会话列表：严格只看到分站会话
	siteList, err := repo.ListConversations(t.Context(), principal, 1, 20, site.SiteCode)
	if err != nil {
		t.Fatalf("查询分站会话列表失败: %v", err)
	}
	if siteList.Total != 1 {
		t.Fatalf("分站会话数量 = %d, want 1", siteList.Total)
	}
	siteItems := siteList.Items.([]ConversationDTO)
	if siteItems[0].ID != siteConv.ID {
		t.Fatalf("分站会话 ID = %d, want %d", siteItems[0].ID, siteConv.ID)
	}
	if siteItems[0].DistributionSiteID == nil || *siteItems[0].DistributionSiteID != site.ID {
		t.Fatalf("分站会话 DistributionSiteID = %v, want %d", siteItems[0].DistributionSiteID, site.ID)
	}

	// 5. 测试 EnsureSupportConversation 分销站点场景
	ensuredSiteConv, err := repo.EnsureSupportConversation(t.Context(), user.ID, "crash", site.SiteCode)
	if err != nil {
		t.Fatalf("分站创建撞车客服失败: %v", err)
	}
	if ensuredSiteConv.DistributionSiteID == nil || *ensuredSiteConv.DistributionSiteID != site.ID {
		t.Fatalf("新建分站会话 DistributionSiteID = %v, want %d", ensuredSiteConv.DistributionSiteID, site.ID)
	}

	// 主站再次查询，仍然只有 1 个主站会话
	mainListAfter, err := repo.ListConversations(t.Context(), principal, 1, 20)
	if err != nil {
		t.Fatalf("主站列表查询失败: %v", err)
	}
	if mainListAfter.Total != 1 {
		t.Fatalf("主站会话数量 = %d, want 1 (分站新增会话不应出现在主站)", mainListAfter.Total)
	}

	// 分站再次查询，有 2 个分站会话
	siteListAfter, err := repo.ListConversations(t.Context(), principal, 1, 20, site.SiteCode)
	if err != nil {
		t.Fatalf("分站列表查询失败: %v", err)
	}
	if siteListAfter.Total != 2 {
		t.Fatalf("分站会话数量 = %d, want 2", siteListAfter.Total)
	}
}