/*
   GoToSocial
   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package admin

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"

	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
	"github.com/superseriousbusiness/gotosocial/internal/id"
	"github.com/superseriousbusiness/gotosocial/internal/uris"
)

func (p *processor) EmojiCreate(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, error) {
	if !user.Admin {
		return nil, fmt.Errorf("user %s not an admin", user.ID)
	}

	data := func(innerCtx context.Context) ([]byte, error) {
		// open the emoji and extract the bytes from it
		f, err := form.Image.Open()
		if err != nil {
			return nil, fmt.Errorf("error opening emoji: %s", err)
		}
		buf := new(bytes.Buffer)
		size, err := io.Copy(buf, f)
		if err != nil {
			return nil, fmt.Errorf("error reading emoji: %s", err)
		}
		if size == 0 {
			return nil, errors.New("could not read provided emoji: size 0 bytes")
		}

		return buf.Bytes(), f.Close()
	}

	emojiID, err := id.NewRandomULID()
	if err != nil {
		return nil, fmt.Errorf("error creating id for new emoji: %s", err)
	}

	emojiURI := uris.GenerateURIForEmoji(emojiID)

	processingEmoji, err := p.mediaManager.ProcessEmoji(ctx, data, form.Shortcode, emojiID, emojiURI, nil)
	if err != nil {
		return nil, err
	}

	emoji, err := processingEmoji.LoadEmoji(ctx)
	if err != nil {
		return nil, err
	}

	apiEmoji, err := p.tc.EmojiToAPIEmoji(ctx, emoji)
	if err != nil {
		return nil, fmt.Errorf("error converting emoji to apitype: %s", err)
	}

	return &apiEmoji, nil
}