package services

import (
	"ai_scheduler/internal/config"
	errorcode "ai_scheduler/internal/data/error"
	"ai_scheduler/internal/gateway"
	"ai_scheduler/internal/pkg/dingtalk"
	"ai_scheduler/internal/pkg/util"
	"ai_scheduler/internal/tools_bot"
	"context"
	"encoding/json"
	"strings"
	"time"

	"github.com/gofiber/fiber/v2"
)

// CallbackService 统一回调入口
type CallbackService struct {
	cfg            *config.Config
	gateway        *gateway.Gateway
	dingtalkClient *dingtalk.Client
	botTool        *tools_bot.BotTool
}

func NewCallbackService(cfg *config.Config, gateway *gateway.Gateway, dingtalkClient *dingtalk.Client, botTool *tools_bot.BotTool) *CallbackService {
	return &CallbackService{
		cfg:            cfg,
		gateway:        gateway,
		dingtalkClient: dingtalkClient,
		botTool:        botTool,
	}
}

// Envelope 回调统一请求体
type Envelope struct {
	Action string          `json:"action"`
	TaskID string          `json:"task_id"`
	Data   json.RawMessage `json:"data"`
}

// bug_optimization_submit_done 工单完成回调
const ActionBugOptimizationSubmitDone = "bug_optimization_submit_done"

// BugOptimizationSubmitDoneData 工单完成回调数据
type BugOptimizationSubmitDoneData struct {
	Receivers  []string `json:"receivers"`
	DetailPage string   `json:"detail_page"`
	Msg        string   `json:"msg"`
}

// Callback 统一回调处理
// 头部：X-Source-Key / X-Timestamp
func (s *CallbackService) Callback(c *fiber.Ctx) error {
	// 读取头
	sourceKey := strings.TrimSpace(c.Get("X-Source-Key"))
	ts := strings.TrimSpace(c.Get("X-Timestamp"))

	// 时间窗口（如果提供了 ts 则校验，否则跳过），窗口 5 分钟
	if ts != "" && !validateTimestamp(ts, 5*time.Minute) {
		return errorcode.AuthNotFound
	}

	// 解析 Envelope
	var env Envelope
	if err := json.Unmarshal(c.Body(), &env); err != nil {
		return errorcode.ParamErr("invalid json: %v", err)
	}
	if env.Action == "" || env.TaskID == "" {
		return errorcode.ParamErr("missing action/task_id")
	}
	if env.Data == nil {
		return errorcode.ParamErr("missing data")
	}

	switch sourceKey {
	case "dingtalk":
		return s.handleDingTalkCallback(c, env)
	default:
		return errorcode.AuthNotFound
	}
}

func validateTimestamp(ts string, window time.Duration) bool {
	// 期望毫秒时间戳或秒级，简单容错
	// 尝试解析为整数
	var n int64
	for _, base := range []int64{1, 1000} { // 秒或毫秒
		if v, ok := parseInt64(ts); ok {
			n = v
			// 归一为毫秒
			if base == 1 && len(ts) <= 10 {
				n = n * 1000
			}
			now := time.Now().UnixMilli()
			diff := now - n
			if diff < 0 {
				diff = -diff
			}
			if diff <= window.Milliseconds() {
				return true
			}
		}
	}
	return false
}

func parseInt64(s string) (int64, bool) {
	var n int64
	for _, ch := range s {
		if ch < '0' || ch > '9' {
			return 0, false
		}
		n = n*10 + int64(ch-'0')
	}
	return n, true
}

func (s *CallbackService) handleDingTalkCallback(c *fiber.Ctx, env Envelope) error {
	switch env.Action {
	// bug/优化完成回调
	case ActionBugOptimizationSubmitDone:
		// 获取 session_id
		sessionID, ok := s.botTool.GetSessionByTaskID(env.TaskID)
		if !ok {
			return errorcode.ParamErr("missing session_id for task_id: %s", env.TaskID)
		}

		var data BugOptimizationSubmitDoneData
		if err := json.Unmarshal(env.Data, &data); err != nil {
			return errorcode.ParamErr("invalid data type: %v", err)
		}

		if len(data.Receivers) == 0 {
			return errorcode.ParamErr("empty receivers")
		}
		// 构建接收者
		receivers := s.getDingtalkReceivers(c.Context(), data.Receivers)

		// 构建跳转链接
		var detailPage string
		if data.DetailPage != "" {
			detailPage = util.BuildJumpLink(data.DetailPage, "去查看")
		}

		msg := data.Msg
		msg = util.ReplacePlaceholder(msg, "receivers", receivers)
		msg = util.ReplacePlaceholder(msg, "detail_page", detailPage)

		s.gateway.SendToUid(sessionID, []byte(msg))

		// 删除映射
		s.botTool.DelTaskMapping(env.TaskID)

		return c.JSON(fiber.Map{"code": 0, "message": "ok"})
	default:
		return errorcode.ParamErr("unknown action: %s", env.Action)
	}
}

// getDingtalkReceivers 解析接收者字符串为 DingTalk 用户 ID 列表
func (s *CallbackService) getDingtalkReceivers(ctx context.Context, receiverIds []string) string {
	var receiverNames []string
	for _, receiverId := range receiverIds {
		userDetails, err := s.dingtalkClient.QueryUserDetails(ctx, receiverId)
		if err != nil {
			return ""
		}
		if userDetails == nil {
			return ""
		}
		receiverNames = append(receiverNames, "@"+userDetails.Name)
	}

	receivers := strings.Join(receiverNames, " ")

	return receivers
}