<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Upload an avatar
 *
 * @category  Settings
 * @package   GNUsocial
 *
 * @author    Evan Prodromou <evan@status.net>
 * @author    Zach Copley <zach@status.net>
 * @author    Diogo Cordeiro <diogo@fc.up.pt>
 * @copyright 2008-2009, 2020 Free Software Foundation http://fsf.org
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 */
defined('GNUSOCIAL') || die;

/**
 * Upload an avatar
 *
 * We use jCrop plugin for jQuery to crop the image after upload.
 *
 * @category Settings
 * @package  StatusNet
 *
 * @author   Evan Prodromou <evan@status.net>
 * @author   Zach Copley <zach@status.net>
 * @author   Sarven Capadisli <csarven@status.net>
 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 *
 * @see     http://status.net/
 */
class AvatarsettingsAction extends SettingsAction
{
    public $mode;
    public $imagefile;
    public $filename;

    public function prepare(array $args = [])
    {
        $avatarpath = Avatar::path('');

        if (!is_writable($avatarpath)) {
            throw new Exception(_m("The administrator of your site needs to
                add write permissions on the avatar upload folder before
                you're able to set one."));
        }

        parent::prepare($args);
        return true;
    }

    /**
     * Title of the page
     *
     * @return string Title of the page
     * @throws Exception
     *
     */
    public function title()
    {
        // TRANS: Title for avatar upload page.
        return _m('Avatar');
    }

    /**
     * Instructions for use
     *
     * @return string instructions for use
     * @throws Exception
     *
     */
    public function getInstructions()
    {
        // TRANS: Instruction for avatar upload page.
        // TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
        return sprintf(
            _m('You can upload your personal avatar. The maximum file size is %s.'),
            ImageFile::maxFileSize()
        );
    }

    /**
     * Content area of the page
     *
     * Shows a form for uploading an avatar. Currently overrides FormAction's showContent
     * since we haven't made classes out of AvatarCropForm and AvatarUploadForm.
     *
     * @return void
     */
    public function showContent()
    {
        if ($this->mode == 'crop') {
            $this->showCropForm();
        } else {
            $this->showUploadForm();
        }
    }

    public function showUploadForm()
    {
        // If we detect that the user didn't finish setting a new avatar, remove the temporary file.
        if (isset($_SESSION['FILEDATA'])) {
            @unlink($_SESSION['FILEDATA']['filepath']);
            unset($_SESSION['FILEDATA']);
        }
        $this->elementStart('form', ['enctype' => 'multipart/form-data',
            'method' => 'post',
            'id' => 'form_settings_avatar',
            'class' => 'form_settings',
            'action' => common_local_url('avatarsettings'),]);
        $this->elementStart('fieldset');
        // TRANS: Avatar upload page form legend.
        $this->element('legend', null, _m('Avatar settings'));
        $this->hidden('token', common_session_token());

        if (Event::handle('StartAvatarFormData', [$this])) {
            $this->elementStart('ul', 'form_data');
            try {
                $original = Avatar::getUploaded($this->scoped);

                $this->elementStart('li', ['id' => 'avatar_original',
                    'class' => 'avatar_view',]);
                // TRANS: Header on avatar upload page for thumbnail of originally uploaded avatar (h2).
                $this->element('h2', null, _m('Original'));
                $this->elementStart('div', ['id' => 'avatar_original_view']);
                $this->element('img', ['src' => $original->displayUrl(),
                    'width' => $original->width,
                    'height' => $original->height,
                    'alt' => $this->scoped->getNickname(),]);
                $this->elementEnd('div');
                $this->elementEnd('li');
            } catch (NoAvatarException $e) {
                // No original avatar found!
            }

            try {
                $avatar = $this->scoped->getAvatar(AVATAR_PROFILE_SIZE);
                $this->elementStart('li', ['id' => 'avatar_preview',
                    'class' => 'avatar_view',]);
                // TRANS: Header on avatar upload page for thumbnail of to be used rendition of uploaded avatar (h2).
                $this->element('h2', null, _m('Preview'));
                $this->elementStart('div', ['id' => 'avatar_preview_view']);
                $this->element('img', ['src' => $avatar->displayUrl(),
                    'width' => AVATAR_PROFILE_SIZE,
                    'height' => AVATAR_PROFILE_SIZE,
                    'alt' => $this->scoped->getNickname(),]);
                $this->elementEnd('div');
                if (!empty($avatar->filename)) {
                    // TRANS: Button on avatar upload page to delete current avatar.
                    $this->submit('delete', _m('BUTTON', 'Delete'));
                }
                $this->elementEnd('li');
            } catch (NoAvatarException $e) {
                // No previously uploaded avatar to preview.
            }

            $this->elementStart('li', ['id' => 'settings_attach']);
            $this->element('input', ['name' => 'MAX_FILE_SIZE',
                'type' => 'hidden',
                'id' => 'MAX_FILE_SIZE',
                'value' => ImageFile::maxFileSizeInt(),]);
            $this->element('input', ['name' => 'avatarfile',
                'type' => 'file',
                'id' => 'avatarfile',]);
            $this->elementEnd('li');
            $this->elementEnd('ul');

            $this->elementStart('ul', 'form_actions');
            $this->elementStart('li');
            // TRANS: Button on avatar upload page to upload an avatar.
            $this->submit('upload', _m('BUTTON', 'Upload'));
            $this->elementEnd('li');
            $this->elementEnd('ul');
        }
        Event::handle('EndAvatarFormData', [$this]);

        $this->elementEnd('fieldset');
        $this->elementEnd('form');
    }

    public function showCropForm()
    {
        $this->elementStart('form', ['method' => 'post',
            'id' => 'form_settings_avatar',
            'class' => 'form_settings',
            'action' => common_local_url('avatarsettings'),]);
        $this->elementStart('fieldset');
        // TRANS: Avatar upload page crop form legend.
        $this->element('legend', null, _m('Avatar settings'));
        $this->hidden('token', common_session_token());

        $this->elementStart('ul', 'form_data');

        $this->elementStart(
            'li',
            ['id' => 'avatar_original',
                'class' => 'avatar_view',]
        );
        // TRANS: Header on avatar upload crop form for thumbnail of originally uploaded avatar (h2).
        $this->element('h2', null, _m('Original'));
        $this->elementStart('div', ['id' => 'avatar_original_view']);
        $this->element('img', ['src' => Avatar::url($this->filedata['filename']),
            'width' => $this->filedata['width'],
            'height' => $this->filedata['height'],
            'alt' => $this->scoped->getNickname(),]);
        $this->elementEnd('div');
        $this->elementEnd('li');

        $this->elementStart(
            'li',
            ['id' => 'avatar_preview',
                'class' => 'avatar_view',]
        );
        // TRANS: Header on avatar upload crop form for thumbnail of to be used rendition of uploaded avatar (h2).
        $this->element('h2', null, _m('Preview'));
        $this->elementStart('div', ['id' => 'avatar_preview_view']);
        $this->element('img', ['src' => Avatar::url($this->filedata['filename']),
            'width' => AVATAR_PROFILE_SIZE,
            'height' => AVATAR_PROFILE_SIZE,
            'alt' => $this->scoped->getNickname(),]);
        $this->elementEnd('div');

        foreach (['avatar_crop_x', 'avatar_crop_y',
                     'avatar_crop_w', 'avatar_crop_h',] as $crop_info) {
            $this->element('input', ['name' => $crop_info,
                'type' => 'hidden',
                'id' => $crop_info,]);
        }

        // TRANS: Button on avatar upload crop form to confirm a selected crop as avatar.
        $this->submit('crop', _m('BUTTON', 'Crop'));

        $this->elementEnd('li');
        $this->elementEnd('ul');
        $this->elementEnd('fieldset');
        $this->elementEnd('form');
    }

    /**
     * @return string
     * @throws NoResultException
     * @throws NoUploadedMediaException
     * @throws ServerException
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     * @throws Exception
     *
     * @throws ClientException
     */
    protected function doPost()
    {
        if (Event::handle('StartAvatarSaveForm', [$this])) {
            if ($this->trimmed('upload')) {
                return $this->uploadAvatar();
            } elseif ($this->trimmed('crop')) {
                return $this->cropAvatar();
            } elseif ($this->trimmed('delete')) {
                return $this->deleteAvatar();
            } else {
                // TRANS: Unexpected validation error on avatar upload form.
                throw new ClientException(_m('Unexpected form submission.'));
            }
            Event::handle('EndAvatarSaveForm', [$this]);
        }
    }

    /**
     * Handle an image upload
     *
     * Does all the magic for handling an image upload, and crops the
     * image by default.
     *
     * @return string
     * @throws NoResultException
     * @throws NoUploadedMediaException
     * @throws ServerException
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     *
     * @throws ClientException
     */
    public function uploadAvatar(): string
    {
        // ImageFile throws exception if something goes wrong, which we'll
        // pick up and show as an error message above the form.
        $imagefile = ImageFile::fromUpload('avatarfile');

        $type = $imagefile->preferredType();
        $filename = Avatar::filename(
            $this->scoped->getID(),
            image_type_to_extension($type),
            null,
            'tmp' . common_timestamp()
        );

        $filepath = Avatar::path($filename);
        $imagefile = $imagefile->copyTo($filepath);

        $filedata = [
            'filename' => $filename,
            'filepath' => $filepath,
            'width' => $imagefile->width,
            'height' => $imagefile->height,
            'type' => $type,
        ];

        $_SESSION['FILEDATA'] = $filedata;

        $this->filedata = $filedata;

        $this->mode = 'crop';

        // TRANS: Avatar upload form instruction after uploading a file.
        return _m('Pick a square area of the image to be your avatar.');
    }

    /**
     * Handle the results of jcrop.
     *
     * @return string
     * @throws NoResultException
     * @throws ServerException
     * @throws UnsupportedMediaException
     *
     * @throws ClientException
     */
    public function cropAvatar()
    {
        $filedata = $_SESSION['FILEDATA'];

        if (empty($filedata)) {
            // TRANS: Server error displayed if an avatar upload went wrong somehow server side.
            throw new ServerException(_m('Lost our file data.'));
        }

        $file_d = min($filedata['width'], $filedata['height']);

        $dest_x = $this->arg('avatar_crop_x') ? $this->arg('avatar_crop_x') : 0;
        $dest_y = $this->arg('avatar_crop_y') ? $this->arg('avatar_crop_y') : 0;
        $dest_w = $this->arg('avatar_crop_w') ? $this->arg('avatar_crop_w') : $file_d;
        $dest_h = $this->arg('avatar_crop_h') ? $this->arg('avatar_crop_h') : $file_d;
        $size = (int)(min($dest_w, $dest_h, common_config('avatar', 'maxsize')));

        $box = ['width' => $size, 'height' => $size,
            'x' => $dest_x, 'y' => $dest_y,
            'w' => $dest_w, 'h' => $dest_h,];

        $imagefile = new ImageFile(-1, $filedata['filepath']);
        $filename = Avatar::filename(
            $this->scoped->getID(),
            image_type_to_extension($imagefile->preferredType()),
            $size,
            common_timestamp()
        );
        try {
            $imagefile->resizeTo(Avatar::path($filename), $box);
        } catch (UseFileAsThumbnailException $e) {
            common_debug('Using uploaded avatar directly without resizing, copying it to: ' . $filename);
            if (!copy($filedata['filepath'], Avatar::path($filename))) {
                common_debug('Tried to copy image file ' . $filedata['filepath'] . ' to destination ' . Avatar::path($filename));
                throw new ServerException('Could not copy file to destination.');
            }
        }

        if ($this->scoped->setOriginal($filename)) {
            @unlink($filedata['filepath']);
            unset($_SESSION['FILEDATA']);
            $this->mode = 'upload';
            // TRANS: Success message for having updated a user avatar.
            return _m('Avatar updated.');
        }

        // TRANS: Error displayed on the avatar upload page if the avatar could not be updated for an unknown reason.
        throw new ServerException(_m('Failed updating avatar.'));
    }

    /**
     * Get rid of the current avatar.
     *
     * @return string
     * @throws Exception
     *
     */
    public function deleteAvatar()
    {
        Avatar::deleteFromProfile($this->scoped);

        // TRANS: Success message for deleting a user avatar.
        return _m('Avatar deleted.');
    }

    /**
     * Add the jCrop stylesheet
     *
     * @return void
     */
    public function showStylesheets()
    {
        parent::showStylesheets();
        $this->cssLink('js/extlib/jquery-jcrop/css/jcrop.css', 'base', 'screen, projection, tv');
    }

    /**
     * Add the jCrop scripts
     *
     * @return void
     */
    public function showScripts()
    {
        parent::showScripts();

        if ($this->mode == 'crop') {
            $this->script('extlib/jquery-jcrop/jcrop.js');
            $this->script('jcrop.go.js');
        }

        $this->autofocus('avatarfile');
    }
}