<?php

namespace Colymba\BulkManager;

use SilverStripe\Core\ClassInfo;
use SilverStripe\Core\Config\Config;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Forms\CheckboxField;
use SilverStripe\Forms\DropdownField;
use SilverStripe\Forms\GridField\GridField_HTMLProvider;
use SilverStripe\Forms\GridField\GridField_ColumnProvider;
use SilverStripe\Forms\GridField\GridField_URLHandler;
use SilverStripe\View\ArrayData;
use SilverStripe\View\Requirements;

/**
 * GridField component for editing attached models in bulk.
 *
 * @author colymba
 */
class BulkManager implements GridField_HTMLProvider, GridField_ColumnProvider, GridField_URLHandler
{
    /**
     * component configuration.
     *
     * 'editableFields' => fields editable on the Model
     * 'actions' => maps of action name and configuration
     *
     * @var array
     */
    protected $config = array(
        'editableFields' => null,
        'actions' => array(),
    );

    /**
     * GridFieldBulkManager component constructor.
     *
     * @param array $editableFields List of editable fields
     * @param bool  $defaultActions Use default actions list. False to start fresh.
     */
    public function __construct($editableFields = null, $defaultActions = true)
    {
        if ($editableFields != null) {
            $this->setConfig('editableFields', $editableFields);
        }

        if ($defaultActions) {
            $this->config['actions'] = array(
                'bulkEdit' => array(
                    'label' => _t('GRIDFIELD_BULK_MANAGER.EDIT_SELECT_LABEL', 'Edit'),
                    'handler' => 'Colymba\\BulkManager\\BulkAction\\EditHandler',
                    'config' => array(
                        'isAjax' => false,
                        'icon' => 'pencil',
                        'isDestructive' => false,
                    ),
                ),
                'unLink' => array(
                    'label' => _t('GRIDFIELD_BULK_MANAGER.UNLINK_SELECT_LABEL', 'UnLink'),
                    'handler' => 'Colymba\\BulkManager\\BulkAction\\UnlinkHandler',
                    'config' => array(
                        'isAjax' => true,
                        'icon' => 'chain--minus',
                        'isDestructive' => false,
                    ),
                ),
                'delete' => array(
                    'label' => _t('GRIDFIELD_BULK_MANAGER.DELETE_SELECT_LABEL', 'Delete'),
                    'handler' => 'Colymba\\BulkManager\\BulkAction\\DeleteHandler',
                    'config' => array(
                        'isAjax' => true,
                        'icon' => 'decline',
                        'isDestructive' => true,
                    ),
                )
            );
        }
    }

    /* **********************************************************************
     * Components settings and custom methodes
     * */

    /**
     * Sets the component configuration parameter.
     *
     * @param string $reference
     * @param mixed  $value
     */
    public function setConfig($reference, $value)
    {
        if (!array_key_exists($reference, $this->config)) {
            user_error("Unknown option reference: $reference", E_USER_ERROR);
        }

        if ($reference == 'actions') {
            user_error('Bulk actions must be edited via addBulkAction() and removeBulkAction()', E_USER_ERROR);
        }

        if (($reference == 'editableFields') && !is_array($value)) {
            $value = array($value);
        }

        $this->config[$reference] = $value;

        return $this;
    }

    /**
     * Returns one $config parameter of the full $config.
     *
     * @param string $reference $congif parameter to return
     *
     * @return mixed
     */
    public function getConfig($reference = false)
    {
        if ($reference) {
            return $this->config[$reference];
        } else {
            return $this->config;
        }
    }

    /**
     * Lets you add custom bulk actions to the bulk manager interface.
     *
     * @todo  add config options for front-end: isAjax, icon
     *
     * @param string $name    Bulk action's name. Used by RequestHandler.
     * @param string $label   Dropdown menu action's label. Default to ucfirst($name).
     * @param string $handler RequestHandler class name for this action. Default to 'GridFieldBulkAction'.ucfirst($name).'Handler'
     * @param array  $config  Front-end configuration array( 'isAjax' => true, 'icon' => 'accept', 'isDestructive' => false )
     *
     * @return GridFieldBulkManager Current GridFieldBulkManager instance
     */
    public function addBulkAction($name, $label = null, $handler = null, $config = null)
    {
        if (array_key_exists($name, $this->config['actions'])) {
            user_error("Bulk action '$name' already exists.", E_USER_ERROR);
        }

        if (!$label) {
            $label = ucfirst($name);
        }

        if (!$handler) {
            $handler = 'Colymba\\BulkManager\\BulkAction\\' . ucfirst($name) . 'Handler';
        }

        if (!ClassInfo::exists($handler)) {
            user_error("Bulk action handler for $name not found: $handler", E_USER_ERROR);
        }

        if ($config && !is_array($config)) {
            user_error('Bulk action front-end config should be an array of key => value pairs.', E_USER_ERROR);
        } else {
            $config = array(
                'isAjax' => isset($config['isAjax']) ? $config['isAjax'] : true,
                'icon' => isset($config['icon']) ? $config['icon'] : 'accept',
                'isDestructive' => isset($config['isDestructive']) ? $config['isDestructive'] : false,
            );
        }

        $this->config['actions'][$name] = array(
            'label' => $label,
            'handler' => $handler,
            'config' => $config,
        );

        return $this;
    }

    /**
     * Removes a bulk actions from the bulk manager interface.
     *
     * @param string $name Bulk action's name
     *
     * @return GridFieldBulkManager Current GridFieldBulkManager instance
     */
    public function removeBulkAction($name)
    {
        if (!array_key_exists($name, $this->config['actions'])) {
            user_error("Bulk action '$name' doesn't exists.", E_USER_ERROR);
        }

        unset($this->config['actions'][$name]);

        return $this;
    }

    /* **********************************************************************
     * GridField_ColumnProvider
     * */

    /**
     * Add bulk select column.
     *
     * @param GridField $gridField Current GridField instance
     * @param array     $columns   Columns list
     */
    public function augmentColumns($gridField, &$columns)
    {
        if (!in_array('BulkSelect', $columns)) {
            $columns[] = 'BulkSelect';
        }
    }

    /**
     * Which columns are handled by the component.
     *
     * @param GridField $gridField Current GridField instance
     *
     * @return array List of handled column names
     */
    public function getColumnsHandled($gridField)
    {
        return array('BulkSelect');
    }

    /**
     * Sets the column's content.
     *
     * @param GridField  $gridField  Current GridField instance
     * @param DataObject $record     Record intance for this row
     * @param string     $columnName Column's name for which we need content
     *
     * @return mixed Column's field content
     */
    public function getColumnContent($gridField, $record, $columnName)
    {
        $cb = CheckboxField::create('bulkSelect_' . $record->ID)
            ->addExtraClass('bulkSelect no-change-track')
            ->setAttribute('data-record', $record->ID);

        return $cb->Field();
    }

    /**
     * Set the column's HTML attributes.
     *
     * @param GridField  $gridField  Current GridField instance
     * @param DataObject $record     Record intance for this row
     * @param string     $columnName Column's name for which we need attributes
     *
     * @return array List of HTML attributes
     */
    public function getColumnAttributes($gridField, $record, $columnName)
    {
        return array('class' => 'col-bulkSelect');
    }

    /**
     * Set the column's meta data.
     *
     * @param GridField $gridField  Current GridField instance
     * @param string    $columnName Column's name for which we need meta data
     *
     * @return array List of meta data
     */
    public function getColumnMetadata($gridField, $columnName)
    {
        if ($columnName == 'BulkSelect') {
            return array('title' => 'Select');
        }
    }

    /* **********************************************************************
     * GridField_HTMLProvider
     * */

    /**
     * @param GridField $gridField
     *
     * @return array
     */
    public function getHTMLFragments($gridField)
    {
        Requirements::javascript('colymba/gridfield-bulk-editing-tools:client/dist/js/bulkTools.js');
        Requirements::css('colymba/gridfield-bulk-editing-tools:client/dist/styles/bulkTools.css');
        Requirements::add_i18n_javascript('colymba/gridfield-bulk-editing-tools:lang');

        if (!count($this->config['actions'])) {
            user_error('Trying to use GridFieldBulkManager without any bulk action.', E_USER_ERROR);
        }

        $actionsListSource = array();
        $actionsConfig = array();

        foreach ($this->config['actions'] as $action => $actionData) {
            $actionsListSource[$action] = $actionData['label'];
            $actionsConfig[$action] = $actionData['config'];
        }

        reset($this->config['actions']);
        $firstAction = key($this->config['actions']);

        $dropDownActionsList = DropdownField::create('bulkActionName', '')
            ->setSource($actionsListSource)
            ->addExtraClass('bulkActionName no-change-track no-chosen')
            ->setAttribute('id', '');

        $templateData = array(
            'Menu' => $dropDownActionsList,
            'Button' => array(
                'Label' => _t('GRIDFIELD_BULK_MANAGER.ACTION_BTN_LABEL', 'Go'),
                'DataURL' => $gridField->Link('bulkAction'),
                'Icon' => $this->config['actions'][$firstAction]['config']['icon'],
                'DataConfig' => json_encode($actionsConfig),
            ),
            'Select' => array(
                'Label' => _t('GRIDFIELD_BULK_MANAGER.SELECT_ALL_LABEL', 'Select all'),
            ),
            'Colspan' => (count($gridField->getColumns()) - 1),
        );

        $templateData = new ArrayData($templateData);

        return array(
            'header' => $templateData->renderWith('BulkManagerButtons'),
        );
    }

    /* **********************************************************************
     * GridField_URLHandler
     * */

    /**
     * Returns an action => handler list.
     *
     * @param GridField $gridField
     *
     * @return array
     */
    public function getURLHandlers($gridField)
    {
        return array(
            'bulkAction' => 'handleBulkAction',
        );
    }

    /**
     * Pass control over to the RequestHandler
     * loop through the handlers provided in config['actions']
     * and find matching url_handlers.
     *
     * $url_handlers rule should not use wildcards like '$Action' => '$Action'
     * but have more specific path defined
     *
     * @param GridField      $gridField
     * @param HTTPRequest $request
     *
     * @return mixed
     */
    public function handleBulkAction($gridField, $request)
    {
        $controller = $gridField->getForm()->getController();

        foreach ($this->config['actions'] as $name => $data) {
            $handlerClass = $data['handler'];
            $urlHandlers = Config::inst()->get($handlerClass, 'url_handlers', Config::UNINHERITED);

            if ($urlHandlers) {
                foreach ($urlHandlers as $rule => $action) {
                    if ($request->match($rule, false)) {
                        //print_r('matched ' . $handlerClass . ' to ' . $rule);
                        $handler = Injector::inst()->create($handlerClass, $gridField, $this, $controller);

                        return $handler->handleRequest($request);
                    }
                }
            }
        }

        user_error('Unable to find matching bulk action handler for ' . $request->remaining() . '.', E_USER_ERROR);
    }
}