package nvcs

import (
	"container/list"
	"fmt"
	"time"

	"gat1400Exchange/config"
	"gat1400Exchange/models"
	"gat1400Exchange/pkg/logger"
)

type simpleCache struct {
	data       *list.List
	expiration time.Duration
}

func newCache(expiration time.Duration) *simpleCache {
	return &simpleCache{
		data:       list.New(),
		expiration: expiration,
	}
}

// 存储数据到缓存中
func (c *simpleCache) store(data elevatorRunData) {
	if config.RFIDConf.ReadFloor && gRFIDFloor != data.Floor {
		if data.RunState == RunStop {
			logger.Warn("A floor error has occurred rfid epc %s, nvcs floor %s", gRFIDFloor, data.Floor)
		}

		data.Floor = gRFIDFloor
	}

	lastData := c.data.Back()

	// 如果楼层相同，并且数据在1秒内，则忽略
	if lastData != nil && lastData.Value.(elevatorRunData).Timestamp == data.Timestamp {
		if lastData.Value.(elevatorRunData).Floor == data.Floor {
			return
		}
	}

	c.data.PushBack(data)

	// 数据库保存一份
	go func() {
		var d = models.Positions{
			DeviceId:   data.Device,
			Pos:        data.Floor,
			RunDir:     data.RunState,
			CreateTime: time.Now().Unix(),
			TimeString: time.Now().Format("2006-01-02 15:04:05"),
		}

		err := d.Save()
		if err != nil {
			logger.Warn("Device position update error:%s", err.Error())
		}
	}()

	// 写OSD
	var runStateStr string
	if config.NVCSConf.RunState {
		if data.RunState == RunUp {
			runStateStr = "上"
		} else if data.RunState == RunDown {
			runStateStr = "下"
		}
	}

	// 设置osd  格式 "1F上 固 枪"
	if config.NVCSConf.OSD != "" {
		floorText := fmt.Sprintf("%s%s %s", data.Floor, runStateStr, config.NVCSConf.OSD)

		// 调用hik api 将文字添加到osd的左下角
		go addFloorToOSD(floorText)
	}

	c.data.PushBack(data)
}

// 删除过期数据
func (c *simpleCache) cleanExpired() {
	now := time.Now()

	// 从队列头部开始检查是否有过期数据
	for c.data.Len() > 0 {
		elem := c.data.Front() // 获取队列头部的元素
		item := elem.Value.(elevatorRunData)
		if now.Sub(time.Unix(item.Timestamp, 0)) > c.expiration {
			// 如果数据已经过期，则从队列中删除
			c.data.Remove(elem)
		} else {
			// 因为数据按时间顺序存储，遇到不过期的数据后就可以停止检查
			break
		}
	}
}