<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2016 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
namespace Fisharebest\Webtrees\Controller;

use Fisharebest\Webtrees\Database;

/**
 * Base controller for all other controllers
 */
class BaseController {
	// The controller accumulates Javascript (inline and external), and renders it in the footer
	const JS_PRIORITY_HIGH   = 0;
	const JS_PRIORITY_NORMAL = 1;
	const JS_PRIORITY_LOW    = 2;

	/** @var string[][] Inline JavaScript to add to the page. */
	private $inline_javascript = [
		self::JS_PRIORITY_HIGH   => [],
		self::JS_PRIORITY_NORMAL => [],
		self::JS_PRIORITY_LOW    => [],
	];

	/** @var string[] Exteral JavaScript files to load. */
	private $external_javascript = [];

	/**
	 * Startup activity
	 */
	public function __construct() {
	}

	/**
	 * Make a list of external Javascript, so we can render them in the footer
	 *
	 * @param string $script_name
	 *
	 * @return $this
	 */
	public function addExternalJavascript($script_name) {
		$this->external_javascript[$script_name] = true;

		return $this;
	}

	/**
	 * Make a list of inline Javascript, so we can render them in the footer
	 * NOTE: there is no need to use "jQuery(document).ready(function(){...})", etc.
	 * as this Javascript won’t be inserted until the very end of the page.
	 *
	 * @param string $script
	 * @param int    $priority
	 *
	 * @return $this
	 */
	public function addInlineJavascript($script, $priority = self::JS_PRIORITY_NORMAL) {
		$tmp   = &$this->inline_javascript[$priority];
		$tmp[] = $script;

		return $this;
	}

	/**
	 * We've collected up Javascript fragments while rendering the page.
	 * Now display them in order.
	 *
	 * @return string
	 */
	public function getJavascript() {
		$javascript1 = '';
		$javascript2 = '';
		$javascript3 = '';

		// Inline (high priority) javascript
		foreach ($this->inline_javascript[self::JS_PRIORITY_HIGH] as $script) {
			$javascript1 .= $script;
		}

		// External javascript
		foreach (array_keys($this->external_javascript) as $script_name) {
			$javascript2 .= '<script src="' . $script_name . '"></script>';
		}

		// Inline (lower priority) javascript
		foreach ($this->inline_javascript as $priority => $scripts) {
			if ($priority !== self::JS_PRIORITY_HIGH) {
				foreach ($scripts as $script) {
					$javascript3 .= $script;
				}
			}
		}

		// We could, in theory, inject JS at any point in the page (not just the bottom) - prepare for next time
		$this->inline_javascript = [
			self::JS_PRIORITY_HIGH   => [],
			self::JS_PRIORITY_NORMAL => [],
			self::JS_PRIORITY_LOW    => [],
		];
		$this->external_javascript = [];

		return '<script>' . $javascript1 . '</script>' . $javascript2 . '<script>' . $javascript3 . '</script>';
	}

	/**
	 * Print the page header, using the theme
	 *
	 * @return $this
	 */
	public function pageHeader() {
		// We've displayed the header - display the footer automatically
		register_shutdown_function([$this, 'pageFooter']);

		return $this;
	}

	/**
	 * Print the page footer, using the theme
	 */
	public function pageFooter() {
		if (WT_DEBUG_SQL) {
			echo Database::getQueryLog();
		}
		echo $this->getJavascript();
	}
}
