package notification

import (
	"encoding/json"
	"time"

	"github.com/google/uuid"
)

// NotificationPayload 通知数据载荷
type NotificationPayload struct {
	Title   string      `json:"title"`   // 通知标题
	Content string      `json:"content"` // 通知内容
	Data    interface{} `json:"data"`    // 附加数据
	URL     string      `json:"url"`     // 相关链接
}

// PositionChangePayload 职位变动通知
type PositionChangePayload struct {
	NotificationPayload
	OldPosition     string `json:"oldPosition"`     // 旧职位
	NewPosition     string `json:"newPosition"`     // 新职位
	OldOrganization string `json:"oldOrganization"` // 旧组织
	NewOrganization string `json:"newOrganization"` // 新组织
	ChangeType      string `json:"changeType"`      // 变动类型：新增、移除、更新
	EffectiveDate   string `json:"effectiveDate"`   // 生效日期
}

// ApprovalNoticePayload 审批通知
type ApprovalNoticePayload struct {
	NotificationPayload
	ApprovalID    string `json:"approvalId"`    // 审批ID
	ApprovalType  string `json:"approvalType"`  // 审批类型
	ApprovalState string `json:"approvalState"` // 审批状态：待审批、已通过、已拒绝
	Approver      string `json:"approver"`      // 审批人
	ApprovalTime  string `json:"approvalTime"`  // 审批时间
}

// MessagePayload 消息提醒
type MessagePayload struct {
	NotificationPayload
	Sender    string `json:"sender"`    // 发送者
	Category  string `json:"category"`  // 消息分类
	Priority  string `json:"priority"`  // 优先级：低、中、高
	ReadState bool   `json:"readState"` // 阅读状态
}

// SystemNotificationPayload 系统通知
type SystemNotificationPayload struct {
	NotificationPayload
	Category string `json:"category"` // 通知分类
	Severity string `json:"severity"` // 严重程度：信息、警告、错误
}

// ScheduleReminderPayload 日程提醒通知
type ScheduleReminderPayload struct {
	NotificationPayload
	ScheduleGuid string `json:"scheduleGuid"`
	StartTime    string `json:"startTime"`
	EndTime      string `json:"endTime"`
}

// NotifyPositionChange 发送职位变动通知
func NotifyPositionChange(staffGuids []string, payload PositionChangePayload) {
	sseServer := GetSSEServer()
	sseServer.SendEventToStaff(staffGuids, PositionChangeEvent, payload)
}

// NotifyApproval 发送审批通知
func NotifyApproval(staffGuids []string, payload ApprovalNoticePayload) {
	sseServer := GetSSEServer()
	sseServer.SendEventToStaff(staffGuids, ApprovalNoticeEvent, payload)
}

// NotifyMessage 发送消息提醒
func NotifyMessage(staffGuids []string, payload MessagePayload) {
	sseServer := GetSSEServer()
	sseServer.SendEventToStaff(staffGuids, MessageNotificationEvent, payload)
}

// NotifySystem 发送系统通知
func NotifySystem(staffGuids []string, payload SystemNotificationPayload) {
	sseServer := GetSSEServer()
	sseServer.SendEventToStaff(staffGuids, SystemNotificationEvent, payload)
}

// NotifyScheduleReminder 发送日程提醒
func NotifyScheduleReminder(staffGuids []string, payload ScheduleReminderPayload) {
	sseServer := GetSSEServer()
	sseServer.SendEventToStaff(staffGuids, ScheduleReminderEvent, payload)
}

// BroadcastSystemNotification 广播系统通知给所有在线用户
func BroadcastSystemNotification(payload SystemNotificationPayload) {
	sseServer := GetSSEServer()
	sseServer.BroadcastEvent(SystemNotificationEvent, payload)
}

// CreateGenericNotification 创建通用通知
func CreateGenericNotification(title, content string) NotificationPayload {
	return NotificationPayload{
		Title:   title,
		Content: content,
		Data:    nil,
		URL:     "",
	}
}

// SerializeEvent 序列化事件为JSON
func SerializeEvent(event Event) (string, error) {
	bytes, err := json.Marshal(event)
	if err != nil {
		return "", err
	}
	return string(bytes), nil
}

// CreateEvent 创建一个新事件
func CreateEvent(eventType EventType, data interface{}) Event {
	return Event{
		ID:        uuid.New().String(),
		Type:      eventType,
		Data:      data,
		Timestamp: time.Now().Unix(),
	}
}