// Copyright 2021 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package convert

import (
	"fmt"
	"strconv"
	"time"

	"xorm.io/xorm/internal/utils"
)

// String2Time converts a string to time with original location
func String2Time(s string, originalLocation *time.Location, convertedLocation *time.Location) (*time.Time, error) {
	if len(s) == 19 {
		if s == utils.ZeroTime0 || s == utils.ZeroTime1 {
			return &time.Time{}, nil
		}
		dt, err := time.ParseInLocation("2006-01-02 15:04:05", s, originalLocation)
		if err != nil {
			return nil, err
		}
		dt = dt.In(convertedLocation)
		return &dt, nil
	} else if len(s) == 20 && s[10] == 'T' && s[19] == 'Z' {
		dt, err := time.ParseInLocation("2006-01-02T15:04:05", s[:19], originalLocation)
		if err != nil {
			return nil, err
		}
		dt = dt.In(convertedLocation)
		return &dt, nil
	} else if len(s) == 25 && s[10] == 'T' && s[19] == '+' && s[22] == ':' {
		dt, err := time.Parse(time.RFC3339, s)
		if err != nil {
			return nil, err
		}
		dt = dt.In(convertedLocation)
		return &dt, nil
	} else {
		i, err := strconv.ParseInt(s, 10, 64)
		if err == nil {
			tm := time.Unix(i, 0).In(convertedLocation)
			return &tm, nil
		}
	}
	return nil, fmt.Errorf("unsupported conversion from %s to time", s)
}