package service

import (
	"context"
	"fmt"

	"google.golang.org/protobuf/proto"
	roomeventsv1 "hyapp.local/api/proto/events/room/v1"
)

// syncRTCUserMuteFromOutbox 把持久化的房间禁言事实补偿到腾讯 RTC 媒体平面。
// 重试时必须读取 Room Cell 的最新禁言集合，而不能直接重放旧事件里的 muted；否则旧 mute
// 在 newer unmute 之后重试会重新关掉用户音频，形成跨系统状态回退。
func (s *Service) syncRTCUserMuteFromOutbox(ctx context.Context, envelope *roomeventsv1.EventEnvelope) error {
	if s == nil || s.rtcUserAudioBlocker == nil || envelope == nil || envelope.GetEventType() != "RoomUserMuted" {
		return nil
	}

	var event roomeventsv1.RoomUserMuted
	if err := proto.Unmarshal(envelope.GetBody(), &event); err != nil {
		return fmt.Errorf("decode rtc mute outbox event: %w", err)
	}
	if event.GetTargetUserId() <= 0 || envelope.GetRoomId() == "" {
		return fmt.Errorf("rtc mute outbox event is incomplete")
	}

	snapshot, err := s.currentSnapshot(ctx, envelope.GetRoomId())
	if err != nil {
		return err
	}
	if snapshot == nil {
		// 房间已被物理清理时 RTC 连接也不再存在；把历史禁言事件视为终态成功，
		// 避免一条不可执行的外部副作用永久阻塞同一 outbox worker。
		return nil
	}
	blocked := containsID(snapshot.GetMuteUserIds(), event.GetTargetUserId())
	return s.rtcUserAudioBlocker.SetUserAudioBlockedByStrRoomID(ctx, envelope.GetRoomId(), event.GetTargetUserId(), blocked)
}