package msgTransfer

import (
	"sync"
	"time"

	msgChat "git.banshen.xyz/huangguangrong/slow_wild_queue/types"
	"github.com/zeromicro/go-zero/core/logx"
)

type groupMsgRead struct {
	mu             sync.Mutex         // 锁
	conversationId string             // 会话id
	push           *msgChat.Push      //推送方法
	pushCh         chan *msgChat.Push // 通道推送
	count          int                // 数量
	pushTime       time.Time          // 上次推送时间
	done           chan struct{}
}

func newGroupMsgRead(push *msgChat.Push, pushCh chan *msgChat.Push) *groupMsgRead {
	g := &groupMsgRead{
		push:           push,
		conversationId: push.ConversationId,
		pushCh:         pushCh,
		count:          1,
		pushTime:       time.Time{},
		done:           make(chan struct{}),
	}
	go g.transfer()
	return g
}

func (g *groupMsgRead) mergePush(push *msgChat.Push) {
	g.mu.Lock()
	defer g.mu.Unlock()
	if push == nil {
		g.push = push
	}
	g.count++
	for msgId, read := range push.ReadRecords {
		g.push.ReadRecords[msgId] = read
	}
}

// 是否是活跃的状态
func (g *groupMsgRead) IsIdle() bool {
	g.mu.Lock()
	defer g.mu.Unlock()
	return g.isIdle()
}

func (g *groupMsgRead) isIdle() bool {
	pushTime := g.pushTime
	val := GroupMsgReadRecordDelayTime*2 - time.Since(pushTime)
	if val <= 0 && g.push == nil && g.count == 0 {
		return true
	}
	return false
}

// 清理内容
func (g *groupMsgRead) clear() {
	select {
	case <-g.done:
	default:
		close(g.done)
	}
	g.push = nil
}

func (g *groupMsgRead) transfer() {
	// 超时发送
	timer := time.NewTimer(GroupMsgReadRecordDelayTime / 2)
	defer timer.Stop()
	for {
		select {
		case <-g.done:
			return
		case <-timer.C:
			g.mu.Lock()
			pushTime := g.pushTime
			val := GroupMsgReadRecordDelayTime - time.Since(pushTime)
			push := g.push
			if val > 0 && g.count < GroupMsgReadRecordDelayCount || push == nil {
				// 时间和数量都没有达标
				if val > 0 {
					timer.Reset(val)
				}
				g.mu.Unlock()
				continue
			}
			g.pushTime = time.Now()
			g.push = nil
			g.count = 0
			timer.Reset(val)
			g.mu.Unlock()
			// 推送
			logx.Infof("超过合并的条件推送 %v", push)
			g.pushCh <- push
		default:
			g.mu.Lock()
			if g.count >= GroupMsgReadRecordDelayCount {
				push := g.push
				// 达到了数量的话也要进行推送
				g.pushTime = time.Now()
				g.push = nil
				g.count = 0
				g.mu.Unlock()
				// 推送
				logx.Infof("超过合并的条件推送 %v", push)
				g.pushCh <- push
				continue
			}
			if g.isIdle() {
				g.mu.Unlock()
				g.pushCh <- &msgChat.Push{
					ChatType:       msgChat.GroupChatType,
					ConversationId: g.conversationId,
				}
				continue
			}
			g.mu.Unlock()
			timeDelay := GroupMsgReadRecordDelayTime / 4
			if timeDelay > time.Second {
				timeDelay = time.Second
			}
			time.Sleep(timeDelay)
		}
	}
	// 超量发送
}