package v1

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"github.com/gochat/gochat/internal/llm"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
)

// --- Copilot Suggestion Message Handler Test Suite ---
// 测试 CopilotSuggestionMessage 的 GET/POST 接口
// 使用真实 SQLite 内存数据库 + 真实 repo + 真实 service

// mockSuggestionLLMProvider 用于测试中模拟 LLM 调用（CopilotSuggestion 不需要 LLM）
type mockSuggestionLLMProvider struct{}

func (m *mockSuggestionLLMProvider) ChatCompletion(ctx context.Context, req llm.ChatRequest) (*llm.ChatResponse, error) {
	return &llm.ChatResponse{
		Choices: []llm.ChatChoice{{Message: llm.ChatMessage{Role: "assistant", Content: "mock response"}}},
	}, nil
}

func (m *mockSuggestionLLMProvider) CreateEmbedding(ctx context.Context, req llm.EmbeddingRequest) (*llm.EmbeddingResponse, error) {
	return &llm.EmbeddingResponse{}, nil
}

func (m *mockSuggestionLLMProvider) ChatCompletionStream(ctx context.Context, req llm.ChatRequest, onChunk func(llm.StreamChunk) error) error {
	return nil
}

type CopilotSuggestionHandlerTestSuite struct {
	suite.Suite
	router   *gin.Engine
	handler  *CopilotHandler
	db       *gorm.DB
	account  *model.Account
}

func (s *CopilotSuggestionHandlerTestSuite) SetupSuite() {
	gin.SetMode(gin.TestMode)

	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	s.Require().NoError(err)
	s.db = db

	// 自动迁移所需模型
	err = db.AutoMigrate(
		&model.Account{},
		&model.CopilotThread{},
		&model.CopilotMessage{},
		&model.CopilotSuggestionMessage{},
	)
	s.Require().NoError(err)

	// 创建测试账户
	account := &model.Account{Name: "CopilotSuggestionTestOrg", Locale: "en", Active: true}
	s.Require().NoError(db.Create(account).Error)
	s.account = account

	// 创建 repo + service + handler
	threadRepo := repository.NewCopilotThreadRepo(db)
	messageRepo := repository.NewCopilotMessageRepo(db)
	suggestionRepo := repository.NewCopilotSuggestionRepo(db)
	mockProvider := &mockSuggestionLLMProvider{}
	svc := service.NewCopilotService(threadRepo, messageRepo, suggestionRepo, mockProvider)
	s.handler = NewCopilotHandler(svc)

	// 设置路由
	s.router = gin.New()
	accountsGroup := s.router.Group("/api/v1/accounts/:id")
	{
		captainGroup := accountsGroup.Group("/captain")
		{
			copilotMessages := captainGroup.Group("/copilot_messages")
			{
				copilotMessages.GET("/", s.handler.ListSuggestionMessages)
				copilotMessages.POST("/", s.handler.CreateSuggestionMessage)
			}
		}
	}
}

func (s *CopilotSuggestionHandlerTestSuite) TearDownSuite() {
	sqlDB, err := s.db.DB()
	s.Require().NoError(err)
	sqlDB.Close()
}

// ========== 创建建议消息测试 ==========

func (s *CopilotSuggestionHandlerTestSuite) TestCreateSuggestionMessage_成功创建回复建议() {
	body := map[string]interface{}{
		"conversation_id":  float64(1),
		"content":          "这是一个回复建议",
		"suggestion_type":  "reply",
	}
	jsonBody, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusCreated, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.True(s.T(), resp["success"].(bool))

	data := resp["data"].(map[string]interface{})
	assert.Equal(s.T(), "这是一个回复建议", data["content"])
	assert.Equal(s.T(), "reply", data["suggestion_type"])
	assert.Equal(s.T(), "pending", data["status"])
}

func (s *CopilotSuggestionHandlerTestSuite) TestCreateSuggestionMessage_默认类型为suggestion() {
	body := map[string]interface{}{
		"conversation_id": float64(2),
		"content":         "这是一个默认建议",
	}
	jsonBody, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusCreated, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	data := resp["data"].(map[string]interface{})
	assert.Equal(s.T(), "suggestion", data["suggestion_type"])
}

func (s *CopilotSuggestionHandlerTestSuite) TestCreateSuggestionMessage_缺少content返回错误() {
	body := map[string]interface{}{
		"conversation_id": float64(1),
	}
	jsonBody, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)

	// 空content应该返回400（验证失败）
	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CopilotSuggestionHandlerTestSuite) TestCreateSuggestionMessage_无效accountID() {
	body := map[string]interface{}{
		"conversation_id": float64(1),
		"content":         "测试内容",
	}
	jsonBody, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/invalid/captain/copilot_messages/", bytes.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

// ========== 列出建议消息测试 ==========

func (s *CopilotSuggestionHandlerTestSuite) TestListSuggestionMessages_成功列出() {
	// 先创建几条建议消息
	for i := 0; i < 3; i++ {
		body := map[string]interface{}{
			"conversation_id": float64(10),
			"content":         "建议消息 " + strconv.Itoa(i+1),
			"suggestion_type": "suggestion",
		}
		jsonBody, _ := json.Marshal(body)
		w := httptest.NewRecorder()
		req, _ := http.NewRequest("POST", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/", bytes.NewReader(jsonBody))
		req.Header.Set("Content-Type", "application/json")
		s.router.ServeHTTP(w, req)
		assert.Equal(s.T(), http.StatusCreated, w.Code)
	}

	// 列出该会话的建议消息
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/?conversation_id=10", nil)
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.True(s.T(), resp["success"].(bool))

	data := resp["data"].([]interface{})
	assert.Equal(s.T(), 3, len(data))

	meta := resp["meta"].(map[string]interface{})
	assert.Equal(s.T(), float64(3), meta["total_count"])
}

func (s *CopilotSuggestionHandlerTestSuite) TestListSuggestionMessages_缺少conversation_id() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/", nil)
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CopilotSuggestionHandlerTestSuite) TestListSuggestionMessages_无效conversation_id() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/?conversation_id=invalid", nil)
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CopilotSuggestionHandlerTestSuite) TestListSuggestionMessages_空结果() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/"+strconv.FormatUint(uint64(s.account.ID), 10)+"/captain/copilot_messages/?conversation_id=999", nil)
	s.router.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	data := resp["data"].([]interface{})
	assert.Equal(s.T(), 0, len(data))
}

func TestCopilotSuggestionHandlerSuite(t *testing.T) {
	suite.Run(t, new(CopilotSuggestionHandlerTestSuite))
}