package uploads

import (
	"context"
	"fmt"
	"io"

	"lmika.dev/lmika/weiro/models"
)

type UploadWithURL struct {
	Upload models.Upload
	URL    string
}

func (s *Service) FetchUpload(ctx context.Context, uploadID int64) (res UploadWithURL, _ error) {
	site, _, err := s.fetchSiteAndUser(ctx)
	if err != nil {
		return UploadWithURL{}, err
	}

	upload, err := s.db.SelectUploadByID(ctx, uploadID)
	if err != nil {
		return UploadWithURL{}, err
	}

	return UploadWithURL{
		Upload: upload,
		URL:    fmt.Sprintf("/sites/%v/uploads/%v/raw", site.ID, upload.ID),
	}, nil
}

func (s *Service) ListUploads(ctx context.Context) (res []UploadWithURL, _ error) {
	site, _, err := s.fetchSiteAndUser(ctx)
	if err != nil {
		return nil, err
	}

	uploads, err := s.db.SelectUploadsOfSite(ctx, site.ID)
	if err != nil {
		return nil, err
	}

	res = make([]UploadWithURL, len(uploads))
	for i, upload := range uploads {
		res[i] = UploadWithURL{
			Upload: upload,
			URL:    fmt.Sprintf("/sites/%v/uploads/%v/raw", site.ID, upload.ID),
		}
	}

	return res, nil
}

func (s *Service) OpenUpload(ctx context.Context, id int64) (models.Upload, func() (io.ReadCloser, error), error) {
	site, _, err := s.fetchSiteAndUser(ctx)
	if err != nil {
		return models.Upload{}, nil, err
	}

	upload, err := s.db.SelectUploadByID(ctx, id)
	if err != nil {
		return models.Upload{}, nil, err
	} else if upload.SiteID != site.ID {
		return models.Upload{}, nil, models.NotFoundError
	}

	return upload, func() (io.ReadCloser, error) {
		rw, err := s.up.OpenUpload(site, upload)
		if err != nil {
			return nil, err
		}
		return rw, nil
	}, nil
}