package database

import (
	"fmt"
	"time"
)

type TimeGroup interface {
}

func (it *Db) ParseTime(t string) (time.Time, error) {
	switch it.Type {
	case "mysql":
		return time.Parse("2006-01-02T15:04:05Z", t)
	case "postgres":
		return time.Parse("2006-01-02T15:04:05Z", t)
	default:
		return time.Parse("2006-01-02 15:04:05", t)
	}
}

func (it *Db) FormatTime(t time.Time) string {
	switch it.Type {
	case "mysql":
		return t.Format("2006-01-02 15:04:05")
	case "postgres":
		return t.Format("2006-01-02 15:04:05.999999999")
	default:
		return t.Format("2006-01-02 15:04:05")
	}
}

func (it *Db) SelectByTime(increment time.Duration) string {
	seconds := int64(increment.Seconds())
	switch it.Type {
	case "mysql":
		return fmt.Sprintf("FROM_UNIXTIME(FLOOR(UNIX_TIMESTAMP(created_at) / %d) * %d) AS timeframe", seconds, seconds)
	case "postgres":
		return fmt.Sprintf("date_trunc('minute', created_at) - (CAST(EXTRACT(MINUTE FROM created_at) AS integer) %% %d) * interval '1 minute' AS timeframe", seconds)
	default:
		return fmt.Sprintf("datetime((strftime('%%s', created_at) / %d) * %d, 'unixepoch') as timeframe", seconds, seconds)
	}
}

func (it *Db) correctTimestamp(increment string) string {
	var timestamper string
	switch increment {
	case "second":
		timestamper = "%Y-%m-%d %H:%M:%S"
	case "minute":
		timestamper = "%Y-%m-%d %H:%M:00"
	case "hour":
		timestamper = "%Y-%m-%d %H:00:00"
	case "day":
		timestamper = "%Y-%m-%d 00:00:00"
	case "month":
		timestamper = "%Y-%m-01 00:00:00"
	case "year":
		timestamper = "%Y-01-01 00:00:00"
	default:
		timestamper = "%Y-%m-%d 00:00:00"
	}

	switch it.Type {
	case "mysql":
	case "second":
		timestamper = "%Y-%m-%d %H:%i:%S"
	case "minute":
		timestamper = "%Y-%m-%d %H:%i:00"
	}

	return timestamper
}