package controllers

import (
	"encoding/json"
	"fmt"
	"io"
	"regexp"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"

	"server/models"
	"server/pkg/jwtutil"

	"github.com/beego/beego/v2/client/orm"
	beego "github.com/beego/beego/v2/server/web"
)

// BackendOaScheduleController OA日程管理（日历待办）。
// 日程数据按 JWT 中的租户与用户双重隔离，仅创建者本人可见与操作。
type BackendOaScheduleController struct {
	beego.Controller
}

func (c *BackendOaScheduleController) oaScheduleClaims() (*jwtutil.Claims, error) {
	auth := c.Ctx.Request.Header.Get("Authorization")
	if auth == "" {
		return nil, orm.ErrNoRows
	}
	parts := strings.SplitN(auth, " ", 2)
	if len(parts) != 2 || parts[0] != "Bearer" {
		return nil, orm.ErrNoRows
	}
	claims, err := jwtutil.ParseToken(parts[1])
	if err != nil {
		return nil, err
	}
	if claims.UserType != "backend" {
		return nil, orm.ErrNoRows
	}
	return claims, nil
}

func (c *BackendOaScheduleController) oasJsonErr(httpStatus, bizCode int, msg string) {
	c.Ctx.Output.SetStatus(httpStatus)
	c.Data["json"] = map[string]interface{}{"code": bizCode, "msg": msg}
	_ = c.ServeJSON()
}

func (c *BackendOaScheduleController) oasOk(data interface{}) {
	c.Data["json"] = map[string]interface{}{"code": 200, "msg": "success", "data": data}
	_ = c.ServeJSON()
}

var (
	oasDatePattern = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}$`)
	oasTimePattern = regexp.MustCompile(`^\d{2}:\d{2}$`)
)

// isValidOaDate 校验 "YYYY-MM-DD" 日期字符串（含真实日历合法性，如 2 月 30 日）。
func isValidOaDate(s string) bool {
	if !oasDatePattern.MatchString(s) {
		return false
	}
	_, err := time.ParseInLocation("2006-01-02", s, time.Local)
	return err == nil
}

// isValidOaTime 校验 "HH:mm" 时间字符串；HH:mm 定长数字串的字典序即时间序。
func isValidOaTime(s string) bool {
	if !oasTimePattern.MatchString(s) {
		return false
	}
	_, err := time.ParseInLocation("15:04", s, time.Local)
	return err == nil
}

// normalizeOaDate 将 ORM 读出的日期值统一为 "YYYY-MM-DD"。
// DSN 开启 parseTime=True 后 DATE 列会被驱动解析为 time.Time，
// 赋给 string 字段后是 Go 默认格式（"2026-08-29 00:00:00 +0800 CST"），取前 10 位。
func normalizeOaDate(s string) string {
	s = strings.TrimSpace(s)
	if len(s) >= 10 {
		return s[:10]
	}
	return s
}

// oaScheduleFilter 日程列表筛选条件，用于构造 ORM 查询条件。
// 指针式的 Has*/On* 标记用于区分"未传参"与"传了默认值 0/空串"。
type oaScheduleFilter struct {
	Keyword     string
	Priority    int8
	HasPriority bool
	StartDate   string
	EndDate     string
	OnDate      string
	Status      int8
	HasStatus   bool
	Ongoing     bool
}

// oaScheduleCond 构造日程查询条件，始终按租户 + 用户双重隔离。
// Ongoing 表示"进行中"：跨天顺延中的任务，即被顺延出去的源日程（carry_over=1）
// 或由前序日程顺延而来的续做日程（source_id>0）。
func oaScheduleCond(tid int, userID int, f oaScheduleFilter) *orm.Condition {
	cond := orm.NewCondition()
	cond = cond.And("is_deleted", 0).And("tid", tid).And("user_id", userID)
	if f.Keyword != "" {
		cond = cond.And("title__icontains", f.Keyword)
	}
	if f.HasPriority {
		cond = cond.And("priority", f.Priority)
	}
	if f.StartDate != "" {
		cond = cond.And("schedule_date__gte", f.StartDate)
	}
	if f.EndDate != "" {
		cond = cond.And("schedule_date__lte", f.EndDate)
	}
	if f.OnDate != "" {
		cond = cond.And("schedule_date", f.OnDate)
	}
	if f.HasStatus {
		cond = cond.And("status", f.Status)
	}
	if f.Ongoing {
		sub := orm.NewCondition()
		sub = sub.Or("source_id__gt", 0).Or("carry_over", 1)
		cond = cond.AndCond(sub)
	}
	return cond
}

func oaScheduleQS(tid int, userID int, f oaScheduleFilter) orm.QuerySeter {
	return models.Orm.QueryTable(new(models.OaSchedule)).
		SetCond(oaScheduleCond(tid, userID, f))
}

// List GET /backend/oa/schedule/list
// 分页查询当前用户的日程，支持 keyword/status/priority/start_date/end_date 筛选，
// 以及 category 待办分类：all-全部 today-今日 pending-未完成 ongoing-进行中 done-已完成。
// 返回值额外带 counts（各分类数量），供页面 tabs 展示角标。
// 日历视图传 start_date/end_date 且 pageSize 足够大时一次拉取区间全量数据。
func (c *BackendOaScheduleController) List() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	page, _ := c.GetInt("page", 1)
	pageSize, _ := c.GetInt("pageSize", 20)
	keyword := strings.TrimSpace(c.GetString("keyword"))
	status := strings.TrimSpace(c.GetString("status"))
	priority := strings.TrimSpace(c.GetString("priority"))
	startDate := strings.TrimSpace(c.GetString("start_date"))
	endDate := strings.TrimSpace(c.GetString("end_date"))
	category := strings.TrimSpace(c.GetString("category"))

	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 500 {
		pageSize = 20
	}

	base := oaScheduleFilter{Keyword: keyword}
	if status == "0" || status == "1" {
		statusVal, _ := strconv.Atoi(status)
		base.HasStatus = true
		base.Status = int8(statusVal)
	}
	if priority == "0" || priority == "1" || priority == "2" {
		priorityVal, _ := strconv.Atoi(priority)
		base.HasPriority = true
		base.Priority = int8(priorityVal)
	}

	// 分类角标按全量统计（只受关键词/优先级影响），不随日历翻月或区间筛选跳动
	countOf := func(f oaScheduleFilter) int64 {
		n, _ := oaScheduleQS(claims.TenantId, claims.UserID, f).Count()
		return n
	}
	today := time.Now().Format("2006-01-02")
	counts := map[string]interface{}{
		"all":     countOf(base),
		"today":   countOf(oaScheduleFilter{Keyword: base.Keyword, Priority: base.Priority, HasPriority: base.HasPriority, OnDate: today}),
		"pending": countOf(oaScheduleFilter{Keyword: base.Keyword, Priority: base.Priority, HasPriority: base.HasPriority, HasStatus: true, Status: 0}),
		"ongoing": countOf(oaScheduleFilter{Keyword: base.Keyword, Priority: base.Priority, HasPriority: base.HasPriority, Ongoing: true}),
		"done":    countOf(oaScheduleFilter{Keyword: base.Keyword, Priority: base.Priority, HasPriority: base.HasPriority, HasStatus: true, Status: 1}),
	}

	// 列表数据 = 基础筛选 + 日期区间 + 当前分类
	listFilter := base
	if isValidOaDate(startDate) {
		listFilter.StartDate = startDate
	}
	if isValidOaDate(endDate) {
		listFilter.EndDate = endDate
	}
	switch category {
	case "today":
		listFilter.OnDate = today
	case "pending":
		listFilter.HasStatus = true
		listFilter.Status = 0
	case "ongoing":
		listFilter.Ongoing = true
	case "done":
		listFilter.HasStatus = true
		listFilter.Status = 1
	}

	qs := oaScheduleQS(claims.TenantId, claims.UserID, listFilter)
	total, _ := qs.Count()

	var list []models.OaSchedule
	_, err = qs.OrderBy("schedule_date", "start_time", "-id").
		Limit(pageSize).Offset((page - 1) * pageSize).
		All(&list)
	if err != nil && err != orm.ErrNoRows {
		c.oasJsonErr(500, 500, "查询失败")
		return
	}
	if list == nil {
		list = []models.OaSchedule{}
	}

	// 统一日期格式，前端日历分组与日期标签均依赖 "YYYY-MM-DD"。
	for i := range list {
		list[i].ScheduleDate = normalizeOaDate(list[i].ScheduleDate)
	}

	c.oasOk(map[string]interface{}{
		"list":   list,
		"total":  total,
		"counts": counts,
	})
}

// Stats GET /backend/oa/schedule/stats
// 返回今日/本周/本月的日程统计与逾期数，供页面顶部统计卡片展示。
func (c *BackendOaScheduleController) Stats() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	now := time.Now()
	today := now.Format("2006-01-02")
	// 本周从周一开始
	weekday := int(now.Weekday())
	if weekday == 0 {
		weekday = 7
	}
	weekStart := now.AddDate(0, 0, -(weekday - 1)).Format("2006-01-02")
	weekEnd := now.AddDate(0, 0, 7-weekday).Format("2006-01-02")
	monthStart := now.Format("2006-01") + "-01"

	base := func() orm.QuerySeter {
		return models.Orm.QueryTable(new(models.OaSchedule)).
			Filter("is_deleted", 0).
			Filter("tid", claims.TenantId).
			Filter("user_id", claims.UserID)
	}

	todayTotal, _ := base().Filter("schedule_date", today).Count()
	todayDone, _ := base().Filter("schedule_date", today).Filter("status", 1).Count()
	weekTotal, _ := base().Filter("schedule_date__gte", weekStart).Filter("schedule_date__lte", weekEnd).Count()
	weekDone, _ := base().Filter("schedule_date__gte", weekStart).Filter("schedule_date__lte", weekEnd).Filter("status", 1).Count()
	monthTotal, _ := base().Filter("schedule_date__gte", monthStart).Count()
	monthDone, _ := base().Filter("schedule_date__gte", monthStart).Filter("status", 1).Count()
	overdue, _ := base().Filter("schedule_date__lt", today).Filter("status", 0).Count()

	c.oasOk(map[string]interface{}{
		"today_total": todayTotal,
		"today_done":  todayDone,
		"week_total":  weekTotal,
		"week_done":   weekDone,
		"month_total": monthTotal,
		"month_done":  monthDone,
		"overdue":     overdue,
	})
}

type oaSchedulePayload struct {
	Title        string   `json:"title"`
	Content      string   `json:"content"`
	ScheduleDate string   `json:"schedule_date"`
	StartTime    string   `json:"start_time"`
	EndTime      string   `json:"end_time"`
	AllDay       int8     `json:"all_day"`
	Color        string   `json:"color"`
	Priority     int8     `json:"priority"`
	// 提醒绑定：开启后会在提醒工具生成一条提醒任务，并把其 ID 回写到 ReminderID。
	ReminderEnabled bool     `json:"reminder_enabled"`
	ReminderTime    string   `json:"reminder_time"`
	RemindChannels  []string `json:"remind_channels"`
	AdvanceMinutes  int      `json:"advance_minutes"`
}

// oaReminderChannels 允许的提醒渠道集合。
var oaReminderChannels = map[string]bool{
	"SMS": true, "EMAIL": true, "BARK": true, "SITE_MSG": true,
}

// createOaScheduleReminder 为 OA 日程创建一条绑定的提醒任务。
// 复用提醒工具的数据模型（yz_backend_schedule + yz_backend_schedule_reminder）：
// 生成一条 BackendSchedule，再按渠道逐条生成提醒记录，返回 BackendSchedule.ID
// 作为 OA 日程的 reminder_id。EMAIL/BARK 渠道会附带确认回执令牌与重复发送配置。
func createOaScheduleReminder(tid int, userID uint64, title, content, reminderTime string, channels []string, advanceMinutes int) (uint64, error) {
	if strings.TrimSpace(reminderTime) == "" {
		return 0, fmt.Errorf("提醒时间不能为空")
	}
	schedTime, err := time.ParseInLocation("2006-01-02 15:04:05", reminderTime, time.Local)
	if err != nil {
		return 0, fmt.Errorf("提醒时间格式不合法")
	}
	if advanceMinutes < 0 {
		advanceMinutes = 0
	}
	title = strings.TrimSpace(title)
	if title == "" {
		title = "日程提醒"
	}

	bs := models.BackendSchedule{
		Tid:          tid,
		Title:        title,
		Content:      content,
		ScheduleTime: schedTime,
		UserID:       userID,
	}
	schedID, err := models.Orm.Insert(&bs)
	if err != nil {
		return 0, fmt.Errorf("创建提醒任务失败: %v", err)
	}

	now := time.Now()
	for _, ch := range channels {
		ch = strings.ToUpper(strings.TrimSpace(ch))
		if !oaReminderChannels[ch] {
			continue
		}
		firstSend := schedTime.Add(-time.Duration(advanceMinutes) * time.Minute)
		reminder := models.BackendScheduleReminder{
			Tid:            tid,
			ScheduleID:     uint64(schedID),
			RemindChannel:  ch,
			AdvanceMinutes: advanceMinutes,
			NextRemindTime: firstSend,
			ReceiverUserID: userID,
			RemindStatus:   0,
			CreateTime:     now,
			UpdateTime:     now,
		}
		if ch == "EMAIL" || ch == "BARK" {
			token := backendGenerateToken()
			reminder.AckToken = &token
			reminder.RepeatIntervalMinutes = 10
			reminder.MaxSendCount = 5
		} else {
			reminder.RepeatIntervalMinutes = 0
			reminder.MaxSendCount = 1
		}
		if _, err := models.Orm.Insert(&reminder); err != nil {
			return 0, fmt.Errorf("创建提醒失败: %v", err)
		}
	}
	return uint64(schedID), nil
}

// deleteBoundReminder 软删除 OA 日程绑定的提醒任务及其提醒记录。
// 删除日程或关闭提醒时使用，避免提醒工具里残留孤立任务。
func deleteBoundReminder(scheduleID uint64) {
	if scheduleID == 0 {
		return
	}
	_, _ = models.Orm.QueryTable(new(models.BackendSchedule)).
		Filter("id", scheduleID).Delete()
	_, _ = models.Orm.QueryTable(new(models.BackendScheduleReminder)).
		Filter("schedule_id", scheduleID).
		Update(map[string]interface{}{"IsDeleted": 1, "UpdateTime": time.Now()})
}

// oaScheduleImage 日程相关图片（截图/照片），只存文件引用，不存二进制。
type oaScheduleImage struct {
	ID   uint64 `json:"id"`
	URL  string `json:"url"`
	Name string `json:"name"`
}

const (
	oaScheduleMaxImages    = 20
	oaScheduleMaxImageURL  = 500
	oaScheduleMaxImageName = 120
)

// normalizeOaScheduleImages 校验并序列化日程图片列表：
// 丢弃无 url 或超长的条目，条目数超限时返回 false。
func normalizeOaScheduleImages(list []oaScheduleImage) (string, bool) {
	if len(list) > oaScheduleMaxImages {
		return "", false
	}
	out := make([]oaScheduleImage, 0, len(list))
	for _, img := range list {
		img.URL = strings.TrimSpace(img.URL)
		if img.URL == "" || len(img.URL) > oaScheduleMaxImageURL {
			continue
		}
		img.Name = strings.TrimSpace(img.Name)
		if utf8.RuneCountInString(img.Name) > oaScheduleMaxImageName {
			img.Name = string([]rune(img.Name)[:oaScheduleMaxImageName])
		}
		out = append(out, img)
	}
	raw, err := json.Marshal(out)
	if err != nil {
		return "", false
	}
	return string(raw), true
}

// parseOaScheduleImages 解析 images 列；脏数据返回空数组，不阻断详情展示。
func parseOaScheduleImages(raw string) []oaScheduleImage {
	list := make([]oaScheduleImage, 0)
	_ = json.Unmarshal([]byte(raw), &list)
	return list
}

// parseOaSchedulePayload 读取并校验新建/编辑日程的请求体；校验失败时直接输出错误响应。
func (c *BackendOaScheduleController) parseOaSchedulePayload() (oaSchedulePayload, bool) {
	var payload oaSchedulePayload
	raw, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil || json.Unmarshal(raw, &payload) != nil {
		c.oasJsonErr(400, 400, "参数错误")
		return payload, false
	}

	payload.Title = strings.TrimSpace(payload.Title)
	if payload.Title == "" {
		c.oasJsonErr(400, 400, "请输入日程标题")
		return payload, false
	}
	if utf8.RuneCountInString(payload.Title) > 80 {
		c.oasJsonErr(400, 400, "日程标题不能超过80字")
		return payload, false
	}
	if !isValidOaDate(payload.ScheduleDate) {
		c.oasJsonErr(400, 400, "日程日期无效")
		return payload, false
	}
	if payload.AllDay != 0 {
		payload.AllDay = 1
		payload.StartTime = ""
		payload.EndTime = ""
	} else {
		if !isValidOaTime(payload.StartTime) {
			c.oasJsonErr(400, 400, "开始时间无效")
			return payload, false
		}
		if payload.EndTime != "" {
			if !isValidOaTime(payload.EndTime) {
				c.oasJsonErr(400, 400, "结束时间无效")
				return payload, false
			}
			if payload.EndTime < payload.StartTime {
				c.oasJsonErr(400, 400, "结束时间不能早于开始时间")
				return payload, false
			}
		}
	}
	if payload.Priority < 0 || payload.Priority > 2 {
		payload.Priority = 0
	}
	payload.Color = strings.TrimSpace(payload.Color)
	if payload.Color == "" {
		payload.Color = "#409EFF"
	}

	// 提醒绑定校验：开启提醒时必须选择渠道且提醒时间合法。
	if payload.ReminderEnabled {
		validChannels := make([]string, 0, len(payload.RemindChannels))
		for _, ch := range payload.RemindChannels {
			ch = strings.ToUpper(strings.TrimSpace(ch))
			if oaReminderChannels[ch] {
				validChannels = append(validChannels, ch)
			}
		}
		payload.RemindChannels = validChannels
		if len(validChannels) == 0 {
			c.oasJsonErr(400, 400, "请至少选择一个提醒渠道")
			return payload, false
		}
		if _, err := time.ParseInLocation("2006-01-02 15:04:05", payload.ReminderTime, time.Local); err != nil {
			c.oasJsonErr(400, 400, "提醒时间格式不合法，支持 YYYY-MM-DD HH:mm:ss")
			return payload, false
		}
		if payload.AdvanceMinutes < 0 {
			payload.AdvanceMinutes = 0
		}
	}
	return payload, true
}

// Create POST /backend/oa/schedule/create
func (c *BackendOaScheduleController) Create() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	payload, ok := c.parseOaSchedulePayload()
	if !ok {
		return
	}

	now := time.Now()
	item := &models.OaSchedule{
		Tid:          claims.TenantId,
		UserID:       uint64(claims.UserID),
		UserName:     claims.Username,
		Title:        payload.Title,
		Content:      payload.Content,
		ScheduleDate: payload.ScheduleDate,
		StartTime:    payload.StartTime,
		EndTime:      payload.EndTime,
		AllDay:       payload.AllDay,
		Color:        payload.Color,
		Priority:     payload.Priority,
		Status:       0,
		IsDeleted:    0,
		CreateTime:   now,
		UpdateTime:   &now,
	}
	if _, err := models.Orm.Insert(item); err != nil {
		c.oasJsonErr(500, 500, "保存失败")
		return
	}

	// 开启提醒：生成绑定的提醒任务，并把其 ID 回写到日程。
	if payload.ReminderEnabled {
		rid, rerr := createOaScheduleReminder(
			claims.TenantId,
			uint64(claims.UserID),
			payload.Title,
			payload.Content,
			payload.ReminderTime,
			payload.RemindChannels,
			payload.AdvanceMinutes,
		)
		if rerr != nil {
			// 回滚已创建的日程，避免产生孤立日程
			_, _ = models.Orm.QueryTable(new(models.OaSchedule)).Filter("id", item.ID).Delete()
			c.oasJsonErr(500, 500, rerr.Error())
			return
		}
		item.ReminderID = rid
		if _, err := models.Orm.Update(item, "ReminderID"); err != nil {
			c.oasJsonErr(500, 500, "保存失败")
			return
		}
	}

	c.oasOk(item)
}

// Update POST /backend/oa/schedule/update/:id
func (c *BackendOaScheduleController) Update() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	payload, ok := c.parseOaSchedulePayload()
	if !ok {
		return
	}

	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在")
		return
	}

	now := time.Now()
	item.Title = payload.Title
	item.Content = payload.Content
	item.ScheduleDate = payload.ScheduleDate
	item.StartTime = payload.StartTime
	item.EndTime = payload.EndTime
	item.AllDay = payload.AllDay
	item.Color = payload.Color
	item.Priority = payload.Priority
	item.UpdateTime = &now

	// 重新绑定提醒：先创建新提醒，成功后再删除旧提醒（关闭提醒则清掉绑定）。
	// 顺序反过来可避免"新提醒创建失败却删掉了原提醒"导致提醒丢失。
	if payload.ReminderEnabled {
		rid, rerr := createOaScheduleReminder(
			claims.TenantId,
			uint64(claims.UserID),
			payload.Title,
			payload.Content,
			payload.ReminderTime,
			payload.RemindChannels,
			payload.AdvanceMinutes,
		)
		if rerr != nil {
			c.oasJsonErr(500, 500, rerr.Error())
			return
		}
		if item.ReminderID > 0 {
			deleteBoundReminder(item.ReminderID)
		}
		item.ReminderID = rid
	} else if item.ReminderID > 0 {
		deleteBoundReminder(item.ReminderID)
		item.ReminderID = 0
	}

	if _, err := models.Orm.Update(&item,
		"Title", "Content", "ScheduleDate", "StartTime", "EndTime",
		"AllDay", "Color", "Priority", "ReminderID", "UpdateTime"); err != nil {
		c.oasJsonErr(500, 500, "保存失败")
		return
	}

	c.oasOk(item)
}

// SetImages POST /backend/oa/schedule/images/:id
// 单独维护日程的相关图片（文件已先上传到文件管理，这里只存引用）。
// 与 Update 分开，避免编辑标题/时间等基础信息时把图片清空。
func (c *BackendOaScheduleController) SetImages() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	var payload struct {
		Images []oaScheduleImage `json:"images"`
	}
	raw, _ := io.ReadAll(c.Ctx.Request.Body)
	if len(raw) > 0 && json.Unmarshal(raw, &payload) != nil {
		c.oasJsonErr(400, 400, "参数错误")
		return
	}
	imagesJSON, ok := normalizeOaScheduleImages(payload.Images)
	if !ok {
		c.oasJsonErr(400, 400, "图片数量过多")
		return
	}

	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在")
		return
	}

	now := time.Now()
	item.Images = imagesJSON
	item.UpdateTime = &now
	if _, err := models.Orm.Update(&item, "Images", "UpdateTime"); err != nil {
		c.oasJsonErr(500, 500, "保存失败")
		return
	}

	c.oasOk(map[string]interface{}{"images": parseOaScheduleImages(imagesJSON)})
}

// UpdateContent POST /backend/oa/schedule/content/:id 仅更新备注内容。
// 与 SetImages 类似，只改写 Content 字段，不影响标题、日期、提醒等其他字段，
// 因此即便日程已完成、已绑定提醒，补充备注也不会破坏既有状态。
func (c *BackendOaScheduleController) UpdateContent() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	var payload struct {
		Content string `json:"content"`
	}
	raw, _ := io.ReadAll(c.Ctx.Request.Body)
	if len(raw) > 0 && json.Unmarshal(raw, &payload) != nil {
		c.oasJsonErr(400, 400, "参数错误")
		return
	}

	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在")
		return
	}

	now := time.Now()
	item.Content = payload.Content
	item.UpdateTime = &now
	if _, err := models.Orm.Update(&item, "Content", "UpdateTime"); err != nil {
		c.oasJsonErr(500, 500, "保存失败")
		return
	}

	c.oasOk(map[string]interface{}{"content": item.Content})
}

// Delete DELETE /backend/oa/schedule/delete/:id 软删除日程。
func (c *BackendOaScheduleController) Delete() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	now := time.Now()
	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在或已删除")
		return
	}

	// 先删除绑定的提醒任务，避免提醒工具里残留孤立任务
	if item.ReminderID > 0 {
		deleteBoundReminder(item.ReminderID)
	}

	item.IsDeleted = 1
	item.DeleteTime = &now
	item.UpdateTime = &now
	if _, err := models.Orm.Update(&item, "IsDeleted", "DeleteTime", "UpdateTime"); err != nil {
		c.oasJsonErr(500, 500, "删除失败")
		return
	}

	c.oasOk(nil)
}

// FinishSchedule POST /backend/oa/schedule/finish/:id
// 切换完成状态：待办 -> 完成（记录完成时间）；完成 -> 待办（清除完成时间）。
// 注意：方法名不能叫 Finish——Finish 是 beego Controller 的生命周期钩子，
// 同名会导致路由调用后再被框架自动调用一次，toggle 逻辑被执行两遍（状态来回切）。
func (c *BackendOaScheduleController) FinishSchedule() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在")
		return
	}

	now := time.Now()
	newStatus := int8(1)
	var finishTime *time.Time
	if item.Status == 1 {
		newStatus = 0
	} else {
		finishTime = &now
	}

	item.Status = newStatus
	item.FinishTime = finishTime
	item.UpdateTime = &now

	if _, err := models.Orm.Update(&item, "Status", "FinishTime", "UpdateTime"); err != nil {
		c.oasJsonErr(500, 500, "操作失败")
		return
	}

	c.oasOk(map[string]interface{}{"status": newStatus})
}

// nextOaDate 返回 dateStr 之后的第 days 天，格式仍为 "YYYY-MM-DD"。
func nextOaDate(dateStr string, days int) string {
	t, err := time.ParseInLocation("2006-01-02", dateStr, time.Local)
	if err != nil {
		return ""
	}
	return t.AddDate(0, 0, days).Format("2006-01-02")
}

// oaScheduleRootID 取顺延链的源头日程ID：本身就是顺延出来的则沿用其来源，否则为自身。
func oaScheduleRootID(item *models.OaSchedule) uint64 {
	if item.SourceID > 0 {
		return item.SourceID
	}
	return item.ID
}

// carryOaSchedule 把一条待办日程顺延到目标日期：
// 1) 原日程标记完成（status=1, carry_over=1, carry_to_date=目标日期）；
// 2) 在目标日期生成一条同内容的待办，source_id 指向顺延链源头。
// 返回新生成的日程与失败原因（空串表示成功）。
func carryOaSchedule(item *models.OaSchedule, targetDate string, claims *jwtutil.Claims, now time.Time) (*models.OaSchedule, string) {
	if item.Status == 1 {
		return nil, "该日程已完成，无需顺延"
	}
	if !isValidOaDate(targetDate) {
		return nil, "顺延日期无效"
	}
	if targetDate <= normalizeOaDate(item.ScheduleDate) {
		return nil, "顺延日期需晚于当前日程日期"
	}

	rootID := oaScheduleRootID(item)

	// 同一条顺延链在目标日期只允许存在一条，避免重复顺延刷出多份待办。
	exist := models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		Filter("source_id", rootID).
		Filter("schedule_date", targetDate).
		Exist()
	if exist {
		return nil, "该日期已存在顺延的日程"
	}

	next := &models.OaSchedule{
		Tid:          item.Tid,
		UserID:       item.UserID,
		UserName:     item.UserName,
		Title:        item.Title,
		Content:      item.Content,
		Images:       item.Images,
		ScheduleDate: targetDate,
		StartTime:    item.StartTime,
		EndTime:      item.EndTime,
		AllDay:       item.AllDay,
		Color:        item.Color,
		Priority:     item.Priority,
		Status:       0,
		SourceID:     rootID,
		CarryCount:   item.CarryCount + 1,
		IsDeleted:    0,
		CreateTime:   now,
		UpdateTime:   &now,
	}
	if _, err := models.Orm.Insert(next); err != nil {
		return nil, "生成顺延日程失败"
	}

	item.Status = 1
	item.FinishTime = &now
	item.CarryOver = 1
	item.CarryToDate = targetDate
	item.UpdateTime = &now
	if _, err := models.Orm.Update(item,
		"Status", "FinishTime", "CarryOver", "CarryToDate", "UpdateTime"); err != nil {
		return nil, "标记原日程完成失败"
	}

	return next, ""
}

// CarrySchedule POST /backend/oa/schedule/carry/:id
// 将单条待办顺延到指定日期（默认下一天）：原日程标记完成，目标日期自动生成新待办。
func (c *BackendOaScheduleController) CarrySchedule() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.oasJsonErr(400, 400, "无效ID")
		return
	}

	// 目标日期可选，不传则默认顺延到下一天
	var payload struct {
		TargetDate string `json:"target_date"`
	}
	if raw, e := io.ReadAll(c.Ctx.Request.Body); e == nil && len(raw) > 0 {
		_ = json.Unmarshal(raw, &payload)
	}
	payload.TargetDate = strings.TrimSpace(payload.TargetDate)

	var item models.OaSchedule
	err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("id", id).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		One(&item)
	if err != nil {
		c.oasJsonErr(404, 404, "日程不存在")
		return
	}

	targetDate := payload.TargetDate
	if targetDate == "" {
		targetDate = nextOaDate(normalizeOaDate(item.ScheduleDate), 1)
	}

	now := time.Now()
	next, msg := carryOaSchedule(&item, targetDate, claims, now)
	if msg != "" {
		c.oasJsonErr(400, 400, msg)
		return
	}

	c.oasOk(map[string]interface{}{
		"new_id":        next.ID,
		"schedule_date": next.ScheduleDate,
		"carry_count":   next.CarryCount,
	})
}

// CarryPending POST /backend/oa/schedule/carry-pending
// 批量顺延：把指定日期（默认今天）全部未完成的日程一次性顺延到目标日期（默认下一天）。
// 已在目标日期存在顺延记录的会被跳过，不会重复生成。
func (c *BackendOaScheduleController) CarryPending() {
	claims, err := c.oaScheduleClaims()
	if err != nil {
		c.oasJsonErr(401, 401, "未登录或无权限")
		return
	}

	var payload struct {
		Date       string `json:"date"`
		TargetDate string `json:"target_date"`
	}
	if raw, e := io.ReadAll(c.Ctx.Request.Body); e == nil && len(raw) > 0 {
		_ = json.Unmarshal(raw, &payload)
	}
	payload.Date = strings.TrimSpace(payload.Date)
	payload.TargetDate = strings.TrimSpace(payload.TargetDate)

	now := time.Now()
	date := payload.Date
	if !isValidOaDate(date) {
		date = now.Format("2006-01-02")
	}
	targetDate := payload.TargetDate
	if !isValidOaDate(targetDate) {
		targetDate = nextOaDate(date, 1)
	}
	if !isValidOaDate(targetDate) {
		c.oasJsonErr(400, 400, "顺延日期无效")
		return
	}

	var list []models.OaSchedule
	_, err = models.Orm.QueryTable(new(models.OaSchedule)).
		Filter("is_deleted", 0).
		Filter("tid", claims.TenantId).
		Filter("user_id", claims.UserID).
		Filter("schedule_date", date).
		Filter("status", 0).
		OrderBy("start_time", "id").
		All(&list)
	if err != nil && err != orm.ErrNoRows {
		c.oasJsonErr(500, 500, "查询失败")
		return
	}

	success, skipped := 0, 0
	lastDate := targetDate
	for i := range list {
		if _, msg := carryOaSchedule(&list[i], targetDate, claims, now); msg != "" {
			skipped++
			continue
		}
		success++
		lastDate = targetDate
	}

	c.oasOk(map[string]interface{}{
		"success":       success,
		"skipped":       skipped,
		"schedule_date": lastDate,
	})
}