<?php

namespace Kirby\Panel;

use Kirby\Form\Form;
use Kirby\Http\Uri;
use Kirby\Toolkit\A;

/**
 * Provides information about the model for the Panel
 * @since 3.6.0
 *
 * @package   Kirby Panel
 * @author    Nico Hoffmann <nico@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier
 * @license   https://getkirby.com/license
 */
abstract class Model
{
    /**
     * @var \Kirby\Cms\ModelWithContent
     */
    protected $model;

    /**
     * @param \Kirby\Cms\ModelWithContent $model
     */
    public function __construct($model)
    {
        $this->model = $model;
    }

    /**
     * Get the content values for the model
     *
     * @return array
     */
    public function content(): array
    {
        return Form::for($this->model)->values();
    }

    /**
     * Returns the drag text from a custom callback
     * if the callback is defined in the config
     * @internal
     *
     * @param string $type markdown or kirbytext
     * @param mixed ...$args
     * @return string|null
     */
    public function dragTextFromCallback(string $type, ...$args): ?string
    {
        $option   = 'panel.' . $type . '.' . $this->model::CLASS_ALIAS . 'DragText';
        $callback = option($option);

        if (
            empty($callback) === false &&
            is_a($callback, 'Closure') === true &&
            ($dragText = $callback($this->model, ...$args)) !== null
        ) {
            return $dragText;
        }

        return null;
    }

    /**
     * Returns the correct drag text type
     * depending on the given type or the
     * configuration
     *
     * @internal
     *
     * @param string|null $type (`auto`|`kirbytext`|`markdown`)
     * @return string
     */
    public function dragTextType(string $type = null): string
    {
        $type ??= 'auto';

        if ($type === 'auto') {
            $type = option('panel.kirbytext', true) ? 'kirbytext' : 'markdown';
        }

        return $type === 'markdown' ? 'markdown' : 'kirbytext';
    }

    /**
     * Returns the setup for a dropdown option
     * which is used in the changes dropdown
     * for example.
     *
     * @return array
     */
    public function dropdownOption(): array
    {
        return [
            'icon' => 'page',
            'link' => $this->url(),
            'text' => $this->model->id(),
        ];
    }

    /**
     * Returns the Panel image definition
     *
     * @internal
     *
     * @param string|array|false|null $settings
     * @return array|null
     */
    public function image($settings = [], string $layout = 'list'): ?array
    {
        // completely switched off
        if ($settings === false) {
            return null;
        }

        // skip image thumbnail if option
        // is explicitly set to show the icon
        if ($settings === 'icon') {
            $settings = [
                'query' => false
            ];
        } elseif (is_string($settings) === true) {
            // convert string settings to proper array
            $settings = [
                'query' => $settings
            ];
        }

        // merge with defaults and blueprint option
        $settings = array_merge(
            $this->imageDefaults(),
            $settings ?? [],
            $this->model->blueprint()->image() ?? [],
        );

        if ($image = $this->imageSource($settings['query'] ?? null)) {
            // main url
            $settings['url'] = $image->url();

            // only create srcsets for resizable files
            if ($image->isResizable() === true) {
                $settings['src'] = static::imagePlaceholder();

                switch ($layout) {
                    case 'cards':
                        $sizes = [352, 864, 1408];
                        break;
                    case 'cardlets':
                        $sizes = [96, 192];
                        break;
                    case 'list':
                    default:
                        $sizes = [38, 76];
                        break;
                }

                if (($settings['cover'] ?? false) === false || $layout === 'cards') {
                    $settings['srcset'] = $image->srcset($sizes);
                } else {
                    $settings['srcset'] = $image->srcset([
                        '1x' => [
                            'width'  => $sizes[0],
                            'height' => $sizes[0],
                            'crop'   => 'center'
                        ],
                        '2x' => [
                            'width'  => $sizes[1],
                            'height' => $sizes[1],
                            'crop'   => 'center'
                        ]
                    ]);
                }
            } elseif ($image->isViewable() === true) {
                $settings['src'] = $image->url();
            }
        }

        if (isset($settings['query']) === true) {
            unset($settings['query']);
        }

        // resolve remaining options defined as query
        return A::map($settings, function ($option) {
            if (is_string($option) === false) {
                return $option;
            }

            return $this->model->toString($option);
        });
    }

    /**
     * Default settings for Panel image
     *
     * @return array
     */
    protected function imageDefaults(): array
    {
        return [
            'back'  => 'pattern',
            'color' => 'gray-500',
            'cover' => false,
            'icon'  => 'page',
            'ratio' => '3/2',
        ];
    }

    /**
     * Data URI placeholder string for Panel image
     *
     * @internal
     *
     * @return string
     */
    public static function imagePlaceholder(): string
    {
        return 'data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw';
    }

    /**
     * Returns the image file object based on provided query
     *
     * @internal
     *
     * @param string|null $query
     * @return \Kirby\Cms\File|\Kirby\Filesystem\Asset|null
     */
    protected function imageSource(?string $query = null)
    {
        $image = $this->model->query($query ?? null);

        // validate the query result
        if (
            is_a($image, 'Kirby\Cms\File') === true ||
            is_a($image, 'Kirby\Filesystem\Asset') === true
        ) {
            return $image;
        }

        return null;
    }

    /**
     * Checks for disabled dropdown options according
     * to the given permissions
     *
     * @param string $action
     * @param array $options
     * @param array $permissions
     * @return bool
     */
    public function isDisabledDropdownOption(string $action, array $options, array $permissions): bool
    {
        $option = $options[$action] ?? true;
        return $permissions[$action] === false || $option === false || $option === 'false';
    }

    /**
     * Returns lock info for the Panel
     *
     * @return array|false array with lock info,
     *                     false if locking is not supported
     */
    public function lock()
    {
        if ($lock = $this->model->lock()) {
            if ($lock->isUnlocked() === true) {
                return ['state' => 'unlock'];
            }

            if ($lock->isLocked() === true) {
                return [
                    'state' => 'lock',
                    'data'  => $lock->get()
                ];
            }

            return ['state' => null];
        }

        return false;
    }

    /**
     * Returns an array of all actions
     * that can be performed in the Panel
     * This also checks for the lock status
     *
     * @param array $unlock An array of options that will be force-unlocked
     * @return array
     */
    public function options(array $unlock = []): array
    {
        $options = $this->model->permissions()->toArray();

        if ($this->model->isLocked()) {
            foreach ($options as $key => $value) {
                if (in_array($key, $unlock)) {
                    continue;
                }

                $options[$key] = false;
            }
        }

        return $options;
    }

    /**
     * Returns the full path without leading slash
     *
     * @return string
     */
    abstract public function path(): string;

    /**
     * Prepares the response data for page pickers
     * and page fields
     *
     * @param array|null $params
     * @return array
     */
    public function pickerData(array $params = []): array
    {
        return [
            'id'       => $this->model->id(),
            'image'    => $this->image(
                $params['image'] ?? [],
                $params['layout'] ?? 'list'
            ),
            'info'     => $this->model->toSafeString($params['info'] ?? false),
            'link'     => $this->url(true),
            'sortable' => true,
            'text'     => $this->model->toSafeString($params['text'] ?? false),
        ];
    }

    /**
     * Returns the data array for the
     * view's component props
     *
     * @internal
     *
     * @return array
     */
    public function props(): array
    {
        $blueprint = $this->model->blueprint();
        $tabs      = $blueprint->tabs();
        $tab       = $blueprint->tab(get('tab')) ?? $tabs[0] ?? null;

        $props = [
            'lock'        => $this->lock(),
            'permissions' => $this->model->permissions()->toArray(),
            'tabs'        => $tabs,
        ];

        // only send the tab if it exists
        // this will let the vue component define
        // a proper default value
        if ($tab) {
            $props['tab'] = $tab;
        }

        return $props;
    }

    /**
     * Returns link url and tooltip
     * for model (e.g. used for prev/next
     * navigation)
     *
     * @internal
     *
     * @param string $tooltip
     * @return array
     */
    public function toLink(string $tooltip = 'title'): array
    {
        return [
            'link'    => $this->url(true),
            'tooltip' => (string)$this->model->{$tooltip}()
        ];
    }

    /**
     * Returns link url and tooltip
     * for optional sibling model and
     * preserves tab selection
     *
     * @internal
     *
     * @param \Kirby\Cms\ModelWithContent|null $model
     * @param string $tooltip
     * @return array
     */
    protected function toPrevNextLink($model = null, string $tooltip = 'title'): ?array
    {
        if ($model === null) {
            return null;
        }

        $data = $model->panel()->toLink($tooltip);

        if ($tab = get('tab')) {
            $uri = new Uri($data['link'], [
                'query' => ['tab' => $tab]
            ]);

            $data['link'] = $uri->toString();
        }

        return $data;
    }

    /**
     * Returns the url to the editing view
     * in the Panel
     *
     * @internal
     *
     * @param bool $relative
     * @return string
     */
    public function url(bool $relative = false): string
    {
        if ($relative === true) {
            return '/' . $this->path();
        }

        return $this->model->kirby()->url('panel') . '/' . $this->path();
    }

    /**
     * Returns the data array for
     * this model's Panel view
     *
     * @internal
     *
     * @return array
     */
    abstract public function view(): array;
}