package svc

import (
	"cicv-data-closedloop/common/config/c_log"
	"cicv-data-closedloop/kinglong/common/cfg"
	commonConfig "cicv-data-closedloop/pji/common/cfg"
	"cicv-data-closedloop/pji/common/global"
	"cicv-data-closedloop/pji/common/util"
	masterConfig "cicv-data-closedloop/pji/master/package/cfg"
	"time"
)

// DiskClean 如果磁盘占用过高，则删除timeWindow和对应的文件
func DiskClean() {
	c_log.GlobalLogger.Info("清理timeWindow，启动！")
	/*
		TTL(0, "删除旧数据")；
		STOP(1, "停止缓存");
		LRU(2, "保留高优先级")
	*/
	policyToDescription := map[string]string{
		"TTL":  "删除旧数据",
		"STOP": "停止缓存",
		"LRU":  "保留高优先级",
	}

	for {
		time.Sleep(1000 * time.Millisecond)
		// 1 获取磁盘占用
		percent := util.GetDiskUsagePercent()
		if percent > commonConfig.CloudConfig.DiskUsage {
			policy := commonConfig.PlatformConfig.TaskCachePolicy
			c_log.GlobalLogger.Errorf("磁盘占用超过 %v，触发删除规则 %v", commonConfig.CloudConfig.DiskUsage, policyToDescription[policy])
			// 2 获取策略
			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 {
				c_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 {
		c_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 := cfg.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

}