package qrcode

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"time"

	"lone-services/pkg/utils"
)

const wxaCodeURL = "https://api.weixin.qq.com/wxa/getwxacode"

func BuildPath(page string, params map[string]string) string {
	if len(params) == 0 {
		return page
	}
	query := url.Values{}
	for k, v := range params {
		query.Add(k, v)
	}
	return page + "?" + query.Encode()
}

func (c *Client) GetWxaCode(accessToken string, req *WxaCodeRequest) ([]byte, error) {
	if accessToken == utils.StringEmpty {
		return nil, fmt.Errorf("wechat access_token empty")
	}
	if req == nil || req.Path == utils.StringEmpty {
		return nil, fmt.Errorf("wechat qrcode path empty")
	}

	payload, err := json.Marshal(req)
	if err != nil {
		return nil, err
	}

	apiURL := fmt.Sprintf("%s?access_token=%s", wxaCodeURL, accessToken)
	httpClient := &http.Client{Timeout: 15 * time.Second}
	resp, err := httpClient.Post(apiURL, "application/json", bytes.NewReader(payload))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("wechat qrcode http status %d", resp.StatusCode)
	}

	if err := parseImageOrError(body); err != nil {
		return nil, err
	}
	return body, nil
}

func (c *Client) CreateWxaCode(ctx context.Context, req *WxaCodeRequest) ([]byte, error) {
	if c == nil || c.Auth == nil {
		return nil, fmt.Errorf("wechat qrcode auth client nil")
	}
	token, err := c.Auth.AccessToken(ctx)
	if err != nil {
		return nil, err
	}
	return c.GetWxaCode(token.AccessToken, req)
}