package service

import (
	"context"
	"testing"

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

	"github.com/gochat/gochat/internal/model"
)

// ========== ListByAccount ==========

func TestConversationService_ListByAccount_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	// 创建2个对话
	for i := 0; i < 2; i++ {
		conv := &model.Conversation{
			AccountID: account.ID,
			InboxID:   inbox.ID,
			ContactID: contact.ID,
			Status:    "open",
			ChannelType:   "对话" + string(rune('A'+i)),
		}
		require.NoError(t, db.Create(conv).Error)
	}

	conversations, total, err := svc.ListByAccount(context.Background(), account.ID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(2), total)
	assert.Len(t, conversations, 2)
}

func TestConversationService_ListByAccount_空列表(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)

	conversations, total, err := svc.ListByAccount(context.Background(), account.ID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(0), total)
	assert.Len(t, conversations, 0)
}

func TestConversationService_ListByAccount_分页(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	for i := 0; i < 5; i++ {
		conv := &model.Conversation{
			AccountID: account.ID,
			InboxID:   inbox.ID,
			ContactID: contact.ID,
			Status:    "open",
		}
		require.NoError(t, db.Create(conv).Error)
	}

	// 第1页，limit=2
	convs, total, err := svc.ListByAccount(context.Background(), account.ID, 0, 2)
	require.NoError(t, err)
	assert.Equal(t, int64(5), total)
	assert.Len(t, convs, 2)
}

// ========== GetByID ==========

func TestConversationService_GetByID_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.GetByID(context.Background(), conv.ID)
	require.NoError(t, err)
	assert.Equal(t, conv.ID, result.ID)
	assert.Equal(t, "open", result.Status)
}

func TestConversationService_GetByID_不存在(t *testing.T) {
	_, _, _, svc := setupConversationService(t)

	result, err := svc.GetByID(context.Background(), 9999)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== GetByAccountAndID ==========

func TestConversationService_GetByAccountAndID_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.GetByAccountAndID(context.Background(), account.ID, conv.ID)
	require.NoError(t, err)
	assert.Equal(t, conv.ID, result.ID)
}

func TestConversationService_GetByAccountAndID_账户不匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	otherAccount := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.GetByAccountAndID(context.Background(), otherAccount.ID, conv.ID)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== ListByInbox ==========

func TestConversationService_ListByInbox_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	for i := 0; i < 3; i++ {
		conv := &model.Conversation{
			AccountID: account.ID,
			InboxID:   inbox.ID,
			ContactID: contact.ID,
			Status:    "open",
		}
		require.NoError(t, db.Create(conv).Error)
	}

	conversations, total, err := svc.ListByInbox(context.Background(), account.ID, inbox.ID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(3), total)
	assert.Len(t, conversations, 3)
}

func TestConversationService_ListByInbox_空列表(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")

	conversations, total, err := svc.ListByInbox(context.Background(), account.ID, inbox.ID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(0), total)
	assert.Len(t, conversations, 0)
}

// ========== Create ==========

func TestConversationService_Create_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	req := CreateConversationRequest{
		InboxID:   inbox.ID,
		ContactID: contact.ID,
		Status:    "open",
		Priority:  "medium",
	}

	result, err := svc.Create(context.Background(), account.ID, req)
	require.NoError(t, err)
	assert.Equal(t, inbox.ID, result.InboxID)
	assert.Equal(t, contact.ID, result.ContactID)
	assert.Equal(t, "open", result.Status)
	assert.Equal(t, "medium", result.Priority)
	assert.Equal(t, account.ID, result.AccountID)
	assert.NotZero(t, result.ID)
}

func TestConversationService_Create_验证失败_缺少InboxID(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	contact := createTestContact(t, db, account.ID)

	req := CreateConversationRequest{
		InboxID:   0, // required
		ContactID: contact.ID,
		Status:    "open",
	}

	result, err := svc.Create(context.Background(), account.ID, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_Create_验证失败_缺少ContactID(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")

	req := CreateConversationRequest{
		InboxID:   inbox.ID,
		ContactID: 0, // required
		Status:    "open",
	}

	result, err := svc.Create(context.Background(), account.ID, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_Create_验证失败_无效Status(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	req := CreateConversationRequest{
		InboxID:   inbox.ID,
		ContactID: contact.ID,
		Status:    "invalid_status", // oneof 校验
	}

	result, err := svc.Create(context.Background(), account.ID, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== Update ==========

func TestConversationService_Update_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	req := UpdateConversationRequest{
		Status:   "resolved",
		Priority: "high",
	}

	result, err := svc.Update(context.Background(), account.ID, conv.ID, req)
	require.NoError(t, err)
	assert.Equal(t, "resolved", result.Status)
	assert.Equal(t, "high", result.Priority)
}

func TestConversationService_Update_部分更新(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	req := UpdateConversationRequest{
		Status: "pending",
	}

	result, err := svc.Update(context.Background(), account.ID, conv.ID, req)
	require.NoError(t, err)
	assert.Equal(t, "pending", result.Status)
}

func TestConversationService_Update_验证失败_无效Status(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	req := UpdateConversationRequest{
		Status: "bad_status",
	}

	result, err := svc.Update(context.Background(), account.ID, conv.ID, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_Update_不存在(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)

	req := UpdateConversationRequest{
		Status: "resolved",
	}

	result, err := svc.Update(context.Background(), account.ID, 9999, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_Update_账户不匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	otherAccount := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	req := UpdateConversationRequest{
		Status: "resolved",
	}

	result, err := svc.Update(context.Background(), otherAccount.ID, conv.ID, req)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== Delete ==========

func TestConversationService_Delete_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	err := svc.Delete(context.Background(), account.ID, conv.ID)
	require.NoError(t, err)

	// 验证软删除后无法找到
	result, err := svc.GetByID(context.Background(), conv.ID)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_Delete_不存在(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)

	err := svc.Delete(context.Background(), account.ID, 9999)
	assert.Error(t, err)
}

func TestConversationService_Delete_账户不匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	otherAccount := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	err := svc.Delete(context.Background(), otherAccount.ID, conv.ID)
	assert.Error(t, err)
}

// ========== Assign ==========

func TestConversationService_Assign_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)
	// 创建用户作为assignee
	user := createTestUser(t, db, account.ID)

	result, err := svc.AssignAgent(context.Background(), account.ID, conv.ID, user.ID)
	require.NoError(t, err)
	require.NotNil(t, result.AssigneeID)
	assert.Equal(t, user.ID, *result.AssigneeID)
}

func TestConversationService_Assign_验证失败_缺少AssigneeID(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.AssignAgent(context.Background(), account.ID, conv.ID, 0) // assigneeID=0 不合法
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_AssignAgent_不存在(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	user := createTestUser(t, db, account.ID)

	result, err := svc.AssignAgent(context.Background(), account.ID, 9999, user.ID)
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_AssignAgent_账户不匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	otherAccount := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)
	user := createTestUser(t, db, account.ID)

	result, err := svc.AssignAgent(context.Background(), otherAccount.ID, conv.ID, user.ID)
	assert.Error(t, err)
	assert.Nil(t, result)
}

// ========== ToggleStatus ==========

func TestConversationService_ToggleStatus_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.ToggleStatus(context.Background(), account.ID, conv.ID, "resolved")
	require.NoError(t, err)
	assert.Equal(t, "resolved", result.Status)
}

// ========== ListByStatus ==========

func TestConversationService_ListByStatus_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	// 创建 open 和 resolved 对话
	openConv := &model.Conversation{AccountID: account.ID, InboxID: inbox.ID, ContactID: contact.ID, Status: "open"}
	resolvedConv := &model.Conversation{AccountID: account.ID, InboxID: inbox.ID, ContactID: contact.ID, Status: "resolved"}
	require.NoError(t, db.Create(openConv).Error)
	require.NoError(t, db.Create(resolvedConv).Error)

	convs, total, err := svc.ListByStatus(context.Background(), account.ID, "open", 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(1), total)
	assert.Len(t, convs, 1)
	assert.Equal(t, "open", convs[0].Status)
}

func TestConversationService_ListByStatus_无匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)

	conv := &model.Conversation{AccountID: account.ID, InboxID: inbox.ID, ContactID: contact.ID, Status: "open"}
	require.NoError(t, db.Create(conv).Error)

	convs, total, err := svc.ListByStatus(context.Background(), account.ID, "resolved", 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(0), total)
	assert.Len(t, convs, 0)
}

// ========== UpdateLabels ==========

func TestConversationService_UpdateLabels_成功(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.UpdateLabels(context.Background(), account.ID, conv.ID, []string{"bug", "feature"})
	require.NoError(t, err)
	assert.Contains(t, result.Labels, "bug")
	assert.Contains(t, result.Labels, "feature")
}

func TestConversationService_UpdateLabels_不存在(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)

	result, err := svc.UpdateLabels(context.Background(), account.ID, 9999, []string{"bug"})
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_UpdateLabels_账户不匹配(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	otherAccount := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	result, err := svc.UpdateLabels(context.Background(), otherAccount.ID, conv.ID, []string{"bug"})
	assert.Error(t, err)
	assert.Nil(t, result)
}

func TestConversationService_UpdateLabels_替换标签(t *testing.T) {
	db, _, _, svc := setupConversationService(t)
	account := createTestAccount(t, db)
	inbox := createTestInbox(t, db, account.ID, "web_widget")
	contact := createTestContact(t, db, account.ID)
	conv := createTestConversation(t, db, account.ID, inbox.ID, contact.ID)

	// 先设置标签
	result, err := svc.UpdateLabels(context.Background(), account.ID, conv.ID, []string{"bug", "feature"})
	require.NoError(t, err)
	assert.Contains(t, result.Labels, "bug")

	// 替换为不同标签
	result, err = svc.UpdateLabels(context.Background(), account.ID, conv.ID, []string{"urgent"})
	require.NoError(t, err)
	assert.Contains(t, result.Labels, "urgent")
}