package models

import (
	"strings"
	"time"
)

type LocalTime time.Time

func init() {
	AddTableName("local_time")
}

const (
	timeFormat = "2006-01-02 15:04:05"
	zeroTime   = "0001-01-01 00:00:00"
)

func NowLocal() LocalTime {
	return LocalTime(time.Now())
}

func (t *LocalTime) UnmarshalJSON(data []byte) error {
	if data[0] == '"' && data[len(data)-1] == '"' {
		data = data[1: len(data)-1]
	}

	dataStr := strings.TrimSpace(string(data))
	if dataStr == "" {
		//now, err := time.ParseInLocation(timeFormat, string(data), time.Local)
		now, err := time.ParseInLocation(timeFormat, zeroTime, time.Local)
		*t = LocalTime(now)
		return err
	}

	var err error
	var now time.Time

	if strings.Index(dataStr, "T") > 0 {
		dataStr = strings.Replace(dataStr, "T", " ", 1)
	}

	if len(dataStr) > 19 {
		dataStr = dataStr[0:19]
		if dataStr == "0001-01-01 00:00:00" {
			dataStr = timeFormat
		}
	} else if len(dataStr) == 10 {
		dataStr += " 00:00:00"
	} else if len(dataStr) == 13 {
		dataStr += ":00:00"
	} else if len(dataStr) == 16 {
		dataStr += ":00"
	}

	now, err = time.ParseInLocation(timeFormat, dataStr, time.Local)

	*t = LocalTime(now)

	return err
}

func (t LocalTime) MarshalJSON() ([]byte, error) {
	b := make([]byte, 0, len(timeFormat)+2)
	b = append(b, '"')
	b = time.Time(t).AppendFormat(b, timeFormat)
	b = append(b, '"')

	return b, nil
}

func (t LocalTime) Value() time.Time {
	return time.Time(t)
}

func (t LocalTime) String() string {
	return t.Value().String()
}

// 数据库解析到对象时调用
func (t *LocalTime) FromDB(data []byte) error {
	if data[0] == '"' && data[len(data)-1] == '"' {
		data = data[1: len(data)-1]
	}

	dataStr := strings.TrimSpace(string(data))
	if dataStr == "" {
		now, err := time.ParseInLocation(timeFormat, zeroTime, time.Local)
		*t = LocalTime(now)
		return err
	}

	var err error
	var now time.Time

	if strings.Index(dataStr, "T") > 0 {
		dataStr = strings.Replace(dataStr, "T", " ", 1)
	}

	if len(dataStr) > 19 {
		dataStr = dataStr[0:19]
		if dataStr == "0000-00-00 00:00:00" {
			dataStr = zeroTime
		}
	} else if len(dataStr) == 10 {
		dataStr += " 00:00:00"
	} else if len(dataStr) == 13 {
		dataStr += ":00:00"
	} else if len(dataStr) == 16 {
		dataStr += ":00"
	}

	now, err = time.ParseInLocation(timeFormat, dataStr, time.Local)

	*t = LocalTime(now)

	return err
}

// 对象解析到数据库时调用
func (t LocalTime) ToDB() ([]byte, error) {
	b := make([]byte, 0, len(timeFormat)+2)
	b = append(b, []byte(time.Time(t).Format(timeFormat))...)
	return b, nil
}