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package m9z
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import (
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"encoding/binary"
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"fmt"
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"github.com/gogf/gf/v2/errors/gerror"
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"math"
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"time"
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)
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type LgnLatData struct {
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Lgn float64 // 经度
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Lat float64 // 纬度
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Loc *time.Location
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}
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// 经纬度参数
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func LgnLatRead(deviceId string) (*LgnLatData, error) {
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ll := new(LgnLatData)
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cmd, err := ReadCmd(deviceId, lgnLat, "读取经纬度参数")
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if err != nil {
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return nil, err
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}
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data := cmd.Data
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lgn := float64(binary.LittleEndian.Uint32(data[0:4])) / 1000000
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lat := float64(binary.LittleEndian.Uint32(data[4:8])) / 1000000
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loc := float64(binary.LittleEndian.Uint32(data[8:len(data)])) / 1000000
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ll.Lgn = lgn
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ll.Lat = lat
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timezone, err := FloatToTimezone(loc)
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if err != nil {
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return nil, err
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}
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ll.Loc = timezone
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return ll, nil
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}
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func LgnLatWrite(deviceId string, data *LgnLatData) error {
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// 将浮点型经纬度转换为字节编码（兼容原Read逻辑）
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buf := make([]byte, 12)
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// 1. 处理经度（4字节）
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lgnInt := uint32(math.Round(data.Lgn * 1000000))
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binary.LittleEndian.PutUint32(buf[0:4], lgnInt)
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// 2. 处理纬度（4字节）
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latInt := uint32(math.Round(data.Lat * 1000000))
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binary.LittleEndian.PutUint32(buf[4:8], latInt)
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// 3. 处理时区（4字节）
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// 从time.Location解析出UTC偏移小时数（含小数）
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offsetHours, err := getTimezoneOffset(data.Loc)
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if err != nil {
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return err
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}
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offsetInt := uint32(math.Round(offsetHours * 1000000))
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binary.LittleEndian.PutUint32(buf[8:12], offsetInt)
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writeResp, err := WriteCmd(deviceId, lgnLat, buf, "写入经纬度参数")
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if err != nil {
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return err
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}
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if !writeResp.Success {
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return gerror.New("设置失败")
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}
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return nil
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}
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// 从time.Location中解析UTC偏移小时数（支持正负）
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func getTimezoneOffset(loc *time.Location) (float64, error) {
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// 任取一个时间点计算偏移（固定时区偏移不会变化）
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t := time.Date(2023, 1, 1, 0, 0, 0, 0, loc)
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_, offsetSec := t.Zone()
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// 转换为小时（含小数）
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offsetHours := float64(offsetSec) / 3600.0
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if offsetHours < -12 || offsetHours > 14 {
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return 0, fmt.Errorf("invalid timezone offset: %f", offsetHours)
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}
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return offsetHours, nil
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}
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// FloatToTimezone 将float64时区值转换为 *time.Location
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// 输入示例: 8.0 → UTC+8, -5.5 → UTC-5:30
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func FloatToTimezone(offset float64) (*time.Location, error) {
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// 验证范围 (-12.0 到 +14.0)
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if offset < -12.0 || offset > 14.0 {
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return nil, fmt.Errorf("时区偏移量超出有效范围 (-12.0 到 +14.0)")
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}
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// 分解小时和分钟
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hours := int(math.Floor(offset))
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minutes := int(math.Round((offset - float64(hours)) * 60))
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// 处理负数情况
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if offset < 0 {
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minutes = -minutes
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}
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// 创建固定时区
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name := fmt.Sprintf("UTC%+03d:%02d", hours, minutes)
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return time.FixedZone(name, hours*3600+minutes*60), nil
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}
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