package sms

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"net/url"
	"strconv"
	"strings"
	"time"
)

type Mitake struct {
	Username string
	Password string
}

func NewSmsMitake(username, password string) *Mitake {
	return &Mitake{
		Username: username,
		Password: password,
	}
}

func (mitake *Mitake) Send(mobile, msg string) (int, error) {
	qs := url.Values{}
	qs.Add("CharsetURL", "UTF8")
	qs.Add("username", mitake.Username)
	qs.Add("password", mitake.Password)
	qs.Add("dstaddr", mobile)
	qs.Add("smbody", url.QueryEscape(msg))

	client := http.Client{Timeout: 2 * time.Second}
	resp, err := client.Get(fmt.Sprintf("http://smsb2c.mitake.com.tw/b2c/mtk/SmSend?%s", qs.Encode()))
	if err != nil {
		return 0, err
	}

	bs, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return 0, err
	}
	defer resp.Body.Close()

	if len(strings.Split(string(bs), "\n")) != 6 {
		return 0, ErrResponse
	}

	qs, err = url.ParseQuery(strings.ReplaceAll(string(bs), "\n", "&"))
	if err != nil {
		return 0, err
	}

	credit, err := strconv.ParseInt(strings.ReplaceAll(qs.Get("AccountPoint"), "\r", ""), 10, 64)
	if err != nil {
		return 0, err
	} else if credit < 0 {
		return 0, ErrNotEnoughCredit
	}

	return int(credit), nil
}