// Package clients 提供一些内部接口的 http client 实现
package clients

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"mime/multipart"
	"net/http"

	"go.uber.org/zap"
)

type PostApiResp[T any] struct {
	Data T `json:"data"`
}

type PostFileResp struct {
	Url string `json:"url"`
}

// PublicClient 公共文件客户端
type PublicClient struct {
	Client *http.Client // 客户端
	Logger *zap.Logger  // 日志
}

// PostFileBytes 上传文件 返回上传的 url 参数 bs 为文件内容
func (c PublicClient) PostFileBytes(ctx context.Context, name string, bs []byte) (string, error) {
	return c.PostFile(ctx, name, bytes.NewReader(bs))
}

// PostFile 上传文件 返回上传的 url
func (c PublicClient) PostFile(ctx context.Context, name string, r io.Reader) (string, error) {
	var b bytes.Buffer
	mw, err := c.writeMultipart(&b, name, r)
	if err != nil {
		return "", err
	}

	const u = "https://public.listensoft.net/api/uploadFile"
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, u, &b)
	if err != nil {
		return "", err
	}
	req.Header.Set("Content-Type", mw.FormDataContentType())

	c.Logger.Debug("上传文件", zap.String("url", u), zap.String("name", name))
	resp, err := c.Client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	bs, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	var response PostApiResp[PostFileResp]
	err = json.Unmarshal(bs, &response)
	if err != nil {
		return "", err
	}
	fu := response.Data.Url
	c.Logger.Debug("上传文件成功", zap.String("name", name), zap.String("fileUrl", fu))
	return fu, nil
}

func (c PublicClient) writeMultipart(w io.Writer, name string, r io.Reader) (*multipart.Writer, error) {
	mw := multipart.NewWriter(w)
	err := writeFileFromReader(mw, "upFile", name, r)
	if err != nil {
		return nil, err
	}
	err = mw.WriteField("path", "/mnt/bank/banks/")
	if err != nil {
		return nil, err
	}
	err = mw.WriteField("name", name)
	if err != nil {
		return nil, err
	}
	err = mw.Close()
	if err != nil {
		return nil, err
	}
	return mw, nil
}