package remote

// TODO 测试
import (
	"context"
	"errors"
	model "github.com/HFO4/cloudreve/models"
	"github.com/HFO4/cloudreve/pkg/auth"
	"github.com/HFO4/cloudreve/pkg/filesystem/response"
	"github.com/HFO4/cloudreve/pkg/serializer"
	"io"
	"net/http"
	"net/url"
	"time"
)

// Handler 远程存储策略适配器
type Handler struct {
	Policy *model.Policy
}

// Get 获取文件内容
func (handler Handler) Get(ctx context.Context, path string) (response.RSCloser, error) {

	return nil, nil
}

// Put 将文件流保存到指定目录
func (handler Handler) Put(ctx context.Context, file io.ReadCloser, dst string, size uint64) error {
	return errors.New("远程策略不支持此上传方式")
}

// Delete 删除一个或多个文件，
// 返回未删除的文件，及遇到的最后一个错误
func (handler Handler) Delete(ctx context.Context, files []string) ([]string, error) {
	return []string{}, nil
}

// Thumb 获取文件缩略图
func (handler Handler) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
	return nil, nil
}

// Source 获取外链URL
func (handler Handler) Source(
	ctx context.Context,
	path string,
	baseURL url.URL,
	ttl int64,
	isDownload bool,
) (string, error) {
	return "", errors.New("暂未实现")
}

// Token 获取上传策略和认证Token
// TODO 测试
func (handler Handler) Token(ctx context.Context, TTL int64, key string) (serializer.UploadCredential, error) {
	// 生成回调地址
	siteURL := model.GetSiteURL()
	apiBaseURI, _ := url.Parse("/api/v3/callback/upload/" + key)
	apiURL := siteURL.ResolveReference(apiBaseURI)

	// 生成上传策略
	policy := serializer.UploadPolicy{
		SavePath:         handler.Policy.DirNameRule,
		FileName:         handler.Policy.FileNameRule,
		AutoRename:       handler.Policy.AutoRename,
		MaxSize:          handler.Policy.MaxSize,
		AllowedExtension: handler.Policy.OptionsSerialized.FileType,
		CallbackURL:      apiURL.String(),
	}
	policyEncoded, err := policy.EncodeUploadPolicy()
	if err != nil {
		return serializer.UploadCredential{}, err
	}

	// 签名上传策略
	uploadRequest, _ := http.NewRequest("POST", "/api/v3/slave/upload", nil)
	uploadRequest.Header = map[string][]string{
		"X-Policy": {policyEncoded},
	}
	auth.SignRequest(uploadRequest, time.Now().Unix()+TTL)

	if credential, ok := uploadRequest.Header["Authorization"]; ok && len(credential) == 1 {
		return serializer.UploadCredential{
			Token:  credential[0],
			Policy: policyEncoded,
		}, nil
	}
	return serializer.UploadCredential{}, errors.New("无法签名上传策略")

}