package tool

import (
	"context"
	"github.com/alist-org/alist/v3/internal/conf"
	"github.com/alist-org/alist/v3/internal/errs"
	"github.com/alist-org/alist/v3/internal/op"
	"github.com/google/uuid"
	"github.com/pkg/errors"
	"path/filepath"
)

type DeletePolicy string

const (
	DeleteOnUploadSucceed DeletePolicy = "delete_on_upload_succeed"
	DeleteOnUploadFailed  DeletePolicy = "delete_on_upload_failed"
	DeleteNever           DeletePolicy = "delete_never"
	DeleteAlways          DeletePolicy = "delete_always"
)

type AddURLArgs struct {
	URL          string
	DstDirPath   string
	Tool         string
	DeletePolicy DeletePolicy
}

func AddURL(ctx context.Context, args *AddURLArgs) error {
	// get tool
	tool, err := Tools.Get(args.Tool)
	if err != nil {
		return errors.Wrapf(err, "failed get tool")
	}
	// check tool is ready
	if !tool.IsReady() {
		// try to init tool
		if _, err := tool.Init(); err != nil {
			return errors.Wrapf(err, "failed init tool %s", args.Tool)
		}
	}
	// check storage
	storage, dstDirActualPath, err := op.GetStorageAndActualPath(args.DstDirPath)
	if err != nil {
		return errors.WithMessage(err, "failed get storage")
	}
	// check is it could upload
	if storage.Config().NoUpload {
		return errors.WithStack(errs.UploadNotSupported)
	}
	// check path is valid
	obj, err := op.Get(ctx, storage, dstDirActualPath)
	if err != nil {
		if !errs.IsObjectNotFound(err) {
			return errors.WithMessage(err, "failed get object")
		}
	} else {
		if !obj.IsDir() {
			// can't add to a file
			return errors.WithStack(errs.NotFolder)
		}
	}

	uid := uuid.NewString()
	tempDir := filepath.Join(conf.Conf.TempDir, args.Tool, uid)
	t := &DownloadTask{
		Url:          args.URL,
		DstDirPath:   args.DstDirPath,
		TempDir:      tempDir,
		DeletePolicy: args.DeletePolicy,
		tool:         tool,
	}
	DownloadTaskManager.Add(t)
	return nil
}