package config

import (
	"context"
	"encoding/json"
	"fmt"
	v1 "likedream-goframe/internal/api/v1"
	"likedream-goframe/internal/application/quesbank"
	"likedream-goframe/internal/common/db"
	errors2 "likedream-goframe/internal/common/errors"
	"likedream-goframe/internal/ent"
	"likedream-goframe/internal/ent/sysconfig"
	"likedream-goframe/internal/utils"
	"strings"
)

// AI配置键常量
const (
	AIConfigKey = "ai.config"
)

// AIConfigServiceV1 AI配置服务
type AIConfigServiceV1 struct{}

// NewAIConfigServiceV1 创建AI配置服务
func NewAIConfigServiceV1() *AIConfigServiceV1 {
	return &AIConfigServiceV1{}
}

// Get 获取AI配置
func (s *AIConfigServiceV1) Get(ctx context.Context, req *v1.AIConfigGetReq) *utils.Response[*v1.AIConfigGetResp] {
	config, err := db.Global.SysConfig.Query().
		Where(sysconfig.KeyEQ(AIConfigKey)).
		Only(ctx)

	if err != nil {
		if ent.IsNotFound(err) {
			return utils.SuccessWithData(&v1.AIConfigGetResp{
				Type:   "chatglm",
				Model:  "glm-4",
				APIKey: "",
			})
		}
		utils.OkOrPanic(err)
	}

	var aiConfig quesbank.AIConfig
	if err := json.Unmarshal([]byte(config.Value), &aiConfig); err != nil {
		utils.OkOrPanic(errors2.NewBusinessError(500, "AI配置解析失败"))
	}

	maskedKey := maskAPIKey(aiConfig.APIKey)

	return utils.SuccessWithData(&v1.AIConfigGetResp{
		Type:   string(aiConfig.Type),
		URL:    aiConfig.URL,
		Model:  aiConfig.Model,
		APIKey: maskedKey,
	})
}

// Update 更新AI配置
func (s *AIConfigServiceV1) Update(ctx context.Context, req *v1.AIConfigUpdateReq) *utils.Response[any] {
	if req.Type == "other" && req.URL == "" {
		utils.OkOrPanic(errors2.NewBusinessError(400, "自定义AI类型必须填写API地址"))
	}

	aiConfig := quesbank.AIConfig{
		Type:   quesbank.AIType(req.Type),
		URL:    req.URL,
		Model:  req.Model,
		APIKey: req.APIKey,
	}

	configValue, err := json.Marshal(aiConfig)
	if err != nil {
		utils.OkOrPanic(errors2.NewBusinessError(500, "配置序列化失败"))
	}

	config, err := db.Global.SysConfig.Query().
		Where(sysconfig.KeyEQ(AIConfigKey)).
		Only(ctx)

	if err != nil {
		if ent.IsNotFound(err) {
			db.Global.SysConfig.Create().
				SetKey(AIConfigKey).
				SetValue(string(configValue)).
				SetDescription("AI答题配置").
				SetType("json").
				SaveX(ctx)
			return utils.SuccessWithMsg("AI配置创建成功")
		}
		utils.OkOrPanic(err)
	}

	db.Global.SysConfig.UpdateOne(config).
		SetValue(string(configValue)).
		ExecX(ctx)

	return utils.SuccessWithMsg("AI配置更新成功")
}

// Test 测试AI配置
func (s *AIConfigServiceV1) Test(ctx context.Context, req *v1.AIConfigTestReq) *utils.Response[*v1.AIConfigTestResp] {
	if req.Type == "other" && req.URL == "" {
		return utils.SuccessWithData(&v1.AIConfigTestResp{
			Success: false,
			Message: "自定义AI类型必须填写API地址",
		})
	}

	aiConfig := quesbank.AIConfig{
		Type:   quesbank.AIType(req.Type),
		URL:    req.URL,
		Model:  req.Model,
		APIKey: req.APIKey,
	}

	aiService := quesbank.NewAIAnswerService(aiConfig)
	testMessages := quesbank.AIChatMessages{
		Messages: []quesbank.AIChatMessage{
			{Role: "user", Content: "你好，请回复\"测试成功\""},
		},
	}

	response, err := aiService.GetAnswer(ctx, testMessages)
	if err != nil {
		return utils.SuccessWithData(&v1.AIConfigTestResp{
			Success: false,
			Message: fmt.Sprintf("AI连接测试失败: %v", err),
		})
	}

	return utils.SuccessWithData(&v1.AIConfigTestResp{
		Success: true,
		Message: fmt.Sprintf("AI连接测试成功，响应: %s", truncateString(response, 100)),
	})
}

// GetTypeList 获取支持的AI类型列表
func (s *AIConfigServiceV1) GetTypeList(ctx context.Context, req *v1.AITypeListReq) *utils.Response[*v1.AITypeListResp] {
	types := []v1.AITypeItem{
		{Type: "chatglm", Name: "智谱AI (ChatGLM)", Description: "智谱AI大模型，支持glm-4等模型", NeedURL: false},
		{Type: "xinghuo", Name: "讯飞星火", Description: "讯飞星火认知大模型", NeedURL: false},
		{Type: "tongyi", Name: "通义千问", Description: "阿里云通义千问大模型", NeedURL: false},
		{Type: "doubao", Name: "豆包", Description: "字节跳动豆包大模型", NeedURL: false},
		{Type: "openai", Name: "OpenAI", Description: "OpenAI GPT系列模型", NeedURL: false},
		{Type: "other", Name: "其他 (兼容OpenAI格式)", Description: "支持任何兼容OpenAI API格式的服务", NeedURL: true},
	}
	return utils.SuccessWithData(&v1.AITypeListResp{Types: types})
}

// GetAIConfig 获取AI配置（内部使用）
func (s *AIConfigServiceV1) GetAIConfig(ctx context.Context) (*quesbank.AIConfig, error) {
	config, err := db.Global.SysConfig.Query().
		Where(sysconfig.KeyEQ(AIConfigKey)).
		Only(ctx)

	if err != nil {
		if ent.IsNotFound(err) {
			return nil, fmt.Errorf("AI配置未设置")
		}
		return nil, err
	}

	var aiConfig quesbank.AIConfig
	if err := json.Unmarshal([]byte(config.Value), &aiConfig); err != nil {
		return nil, fmt.Errorf("AI配置解析失败: %w", err)
	}

	return &aiConfig, nil
}

func maskAPIKey(key string) string {
	if len(key) <= 8 {
		return strings.Repeat("*", len(key))
	}
	return key[:4] + strings.Repeat("*", len(key)-8) + key[len(key)-4:]
}

func truncateString(s string, maxLen int) string {
	if len(s) <= maxLen {
		return s
	}
	return s[:maxLen] + "..."
}