package svc

import (
	commonConfig "cicv-data-closedloop/kinglong/common/cfg"
	"cicv-data-closedloop/kinglong/common/global"
	"cicv-data-closedloop/kinglong/common/log"
	"cicv-data-closedloop/kinglong/common/util"
	masterConfig "cicv-data-closedloop/kinglong/master/pkg/cfg"
	"time"
)

// DiskClean 如果磁盘占用过高，则删除timeWindow和对应的文件
func DiskClean() {
	log.GlobalLogger.Info("启动timeWindow清理goroutine，根据缓存策略清理copy目录。")
	for {
		time.Sleep(1000 * time.Millisecond)
		bags := util.ListAbsolutePathWithSuffixAndSort(commonConfig.CloudConfig.BagCopyDir, ".bag")
		if len(bags) == 0 {
			continue
		}
		// 1 获取磁盘占用
		percent := util.GetDiskUsagePercent()
		if percent > commonConfig.CloudConfig.DiskUsage {
			// 2 获取策略
			/*
				TTL(0, "删除旧数据")；
				STOP(1, "停止缓存");
				LRU(2, "保留高优先级")
			*/
			policy := commonConfig.PlatformConfig.TaskCachePolicy
			if policy == "TTL" {
				// 1 获取时间窗口队列中的第二个
				if len(global.TimeWindowConsumerQueue) > 2 {
					deleteTimeWindow(1)
				}
			} else if policy == "STOP" {
				// 2 获取时间窗口队列中的倒数第一个
				if len(global.TimeWindowConsumerQueue) > 2 {
					deleteTimeWindow(len(global.TimeWindowConsumerQueue) - 1)
				}
			} else if policy == "LRU" {
				// 3 获取优先级最低的时间窗口
				if len(global.TimeWindowConsumerQueue) > 2 {
					indexToRemove := getIndexToRemoveForLRU()
					if indexToRemove != -1 {
						deleteTimeWindow(indexToRemove)
					}
				}
			} else {
				log.GlobalLogger.Error("未知的缓存策略：", policy)
			}
		}
	}
}

func deleteTimeWindow(indexToRemove int) {
	timeWindowToRemove := global.TimeWindowConsumerQueue[indexToRemove]
	// 删除文件
	faultTime := timeWindowToRemove.FaultTime
	dir := util.GetCopyDir(faultTime)
	err := util.RemoveDir(dir)
	if err != nil {
		log.GlobalLogger.Error("删除目录", dir, "失败：", err)
	}
	global.TimeWindowConsumerQueueMutex.Lock()
	// 使用切片的特性删除指定位置的元素
	global.TimeWindowConsumerQueue = append(global.TimeWindowConsumerQueue[:indexToRemove], global.TimeWindowConsumerQueue[indexToRemove+1:]...)
	global.TimeWindowConsumerQueueMutex.Unlock()
}

func getIndexToRemoveForLRU() int {
	lru := commonConfig.PlatformConfig.Lru
	i := len(lru) - 1
	for i >= 0 {
		for i2, window := range global.TimeWindowConsumerQueue {
			if masterConfig.LabelMapTriggerId[window.FaultTime] == lru[i] {
				return i2
			}
		}
	}
	return -1

}