package wechat

import (
	"bytes"
	"encoding/json"
	"errors"

	"git.chuangxin1.com/cx/myth"
)

func checkErrorWithBody(msg myth.HTTPMessage) (body []byte, err error) {
	if msg.StatusCode == 200 {
		var res ResponseMsg
		err = json.Unmarshal(msg.Body, &res)
		if err == nil {
			if res.ErrCode != ErrReqOk {
				err = errors.New(res.ErrMsg)
			} else {
				body = msg.Body
			}
		}
	} else {
		err = errors.New(`HTTP StatusCode not 200`)
	}
	return
}

func checkError(msg myth.HTTPMessage) (res Response, err error) {
	if msg.StatusCode == 200 {
		err = json.Unmarshal(msg.Body, &res)
		if err == nil {
			if res.ErrCode != ErrReqOk {
				err = errors.New(res.ErrMsg)
			}
		}
	} else {
		err = errors.New(`HTTP StatusCode not 200`)
	}
	return
}

func getJSON(uri string) (res Response, err error) {
	var msg myth.HTTPMessage
	if msg, err = myth.Get(uri, "", "", map[string]string{}); err != nil {
		return
	}
	res, err = checkError(msg)
	return
}

func getBody(uri string) (body []byte, err error) {
	var msg myth.HTTPMessage
	if msg, err = myth.Get(uri, "", "", map[string]string{}); err != nil {
		return
	}
	body, err = checkErrorWithBody(msg)
	return
}

func postXML(url string, data []byte) (res Response, err error) {
	var (
		msg     myth.HTTPMessage
		headers = make(map[string]string)
	)

	headers["Accept-Encoding"] = "gzip, deflate, br"
	headers["Accept"] = "application/json"
	headers["Content-Type"] = "application/xml; charset=utf-8"
	msg, err = myth.Post(url, "", "", headers, bytes.NewReader(data))
	if err != nil {
		return
	}
	res, err = checkError(msg)
	return
}

func postJSON(url string, data []byte) (res Response, err error) {
	var (
		msg     myth.HTTPMessage
		headers = make(map[string]string)
	)

	headers["Accept-Encoding"] = "gzip, deflate, br"
	headers["Accept"] = "application/json"
	headers["Content-Type"] = "application/json; charset=utf-8"
	msg, err = myth.Post(url, "", "", headers, bytes.NewReader(data))
	if err != nil {
		return
	}
	res, err = checkError(msg)
	return
}

func postJSONBody(uri string, data []byte) (body []byte, err error) {
	var (
		msg     myth.HTTPMessage
		headers = make(map[string]string)
	)

	headers["Accept-Encoding"] = "gzip, deflate, br"
	headers["Accept"] = "application/json"
	headers["Content-Type"] = "application/json; charset=utf-8"
	msg, err = myth.Post(uri, "", "", headers, bytes.NewReader(data))
	if err != nil {
		return
	}
	body, err = checkErrorWithBody(msg)

	return
}