<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	File: qa-include/qa-page-admin-categories.php
	Description: Controller for admin page for editing categories


	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 2
	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.

	More about this license: http://www.question2answer.org/license.php
*/

	if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
		header('Location: ../');
		exit;
	}

	require_once QA_INCLUDE_DIR.'app/admin.php';
	require_once QA_INCLUDE_DIR.'db/selects.php';
	require_once QA_INCLUDE_DIR.'db/admin.php';


//	Get relevant list of categories

	$editcategoryid=qa_post_text('edit');
	if (!isset($editcategoryid))
		$editcategoryid=qa_get('edit');
	if (!isset($editcategoryid))
		$editcategoryid=qa_get('addsub');

	$categories=qa_db_select_with_pending(qa_db_category_nav_selectspec($editcategoryid, true, false, true));


//	Check admin privileges (do late to allow one DB query)

	if (!qa_admin_check_privileges($qa_content))
		return $qa_content;


//	Work out the appropriate state for the page

	$editcategory=@$categories[$editcategoryid];

	if (isset($editcategory)) {
		$parentid=qa_get('addsub');
		if (isset($parentid))
			$editcategory=array('parentid' => $parentid);

	} else {
		if (qa_clicked('doaddcategory'))
			$editcategory=array();

		elseif (qa_clicked('dosavecategory')) {
			$parentid=qa_post_text('parent');
			$editcategory=array('parentid' => strlen($parentid) ? $parentid : null);
		}
	}

	$setmissing=qa_post_text('missing') || qa_get('missing');

	$setparent=(!$setmissing) && (qa_post_text('setparent') || qa_get('setparent')) && isset($editcategory['categoryid']);

	$hassubcategory=false;
	foreach ($categories as $category)
		if (!strcmp($category['parentid'], $editcategoryid))
			$hassubcategory=true;


//	Process saving options

	$savedoptions=false;
	$securityexpired=false;

	if (qa_clicked('dosaveoptions')) {
		if (!qa_check_form_security_code('admin/categories', qa_post_text('code')))
			$securityexpired=true;

		else {
			qa_set_option('allow_no_category', (int)qa_post_text('option_allow_no_category'));
			qa_set_option('allow_no_sub_category', (int)qa_post_text('option_allow_no_sub_category'));
			$savedoptions=true;
		}
	}


//	Process saving an old or new category

	if (qa_clicked('docancel')) {
		if ($setmissing || $setparent)
			qa_redirect(qa_request(), array('edit' => $editcategory['categoryid']));
		elseif (isset($editcategory['categoryid']))
			qa_redirect(qa_request());
		else
			qa_redirect(qa_request(), array('edit' => @$editcategory['parentid']));

	} elseif (qa_clicked('dosetmissing')) {
		if (!qa_check_form_security_code('admin/categories', qa_post_text('code')))
			$securityexpired=true;

		else {
			$inreassign=qa_get_category_field_value('reassign');
			qa_db_category_reassign($editcategory['categoryid'], $inreassign);
			qa_redirect(qa_request(), array('recalc' => 1, 'edit' => $editcategory['categoryid']));
		}

	} elseif (qa_clicked('dosavecategory')) {
		if (!qa_check_form_security_code('admin/categories', qa_post_text('code')))
			$securityexpired=true;

		elseif (qa_post_text('dodelete')) {

			if (!$hassubcategory) {
				$inreassign=qa_get_category_field_value('reassign');
				qa_db_category_reassign($editcategory['categoryid'], $inreassign);
				qa_db_category_delete($editcategory['categoryid']);
				qa_redirect(qa_request(), array('recalc' => 1, 'edit' => $editcategory['parentid']));
			}

		} else {
			require_once QA_INCLUDE_DIR.'util/string.php';

			$inname=qa_post_text('name');
			$incontent=qa_post_text('content');
			$inparentid=$setparent ? qa_get_category_field_value('parent') : $editcategory['parentid'];
			$inposition=qa_post_text('position');
			$errors=array();

		//	Check the parent ID

			$incategories=qa_db_select_with_pending(qa_db_category_nav_selectspec($inparentid, true));

		//	Verify the name is legitimate for that parent ID

			if (empty($inname))
				$errors['name']=qa_lang('main/field_required');
			elseif (qa_strlen($inname)>QA_DB_MAX_CAT_PAGE_TITLE_LENGTH)
				$errors['name']=qa_lang_sub('main/max_length_x', QA_DB_MAX_CAT_PAGE_TITLE_LENGTH);
			else {
				foreach ($incategories as $category)
					if (
						(!strcmp($category['parentid'], $inparentid)) &&
						strcmp($category['categoryid'], @$editcategory['categoryid']) &&
						qa_strtolower($category['title']) == qa_strtolower($inname)
					)
						$errors['name']=qa_lang('admin/category_already_used');
			}

		//	Verify the slug is legitimate for that parent ID

			for ($attempt=0; $attempt<100; $attempt++) {
				switch ($attempt) {
					case 0:
						$inslug=qa_post_text('slug');
						if (!isset($inslug))
							$inslug=implode('-', qa_string_to_words($inname));
						break;

					case 1:
						$inslug=qa_lang_sub('admin/category_default_slug', $inslug);
						break;

					default:
						$inslug=qa_lang_sub('admin/category_default_slug', $attempt-1);
						break;
				}

				$matchcategoryid=qa_db_category_slug_to_id($inparentid, $inslug); // query against DB since MySQL ignores accents, etc...

				if (!isset($inparentid))
					$matchpage=qa_db_single_select(qa_db_page_full_selectspec($inslug, false));
				else
					$matchpage=null;

				if (empty($inslug))
					$errors['slug']=qa_lang('main/field_required');
				elseif (qa_strlen($inslug)>QA_DB_MAX_CAT_PAGE_TAGS_LENGTH)
					$errors['slug']=qa_lang_sub('main/max_length_x', QA_DB_MAX_CAT_PAGE_TAGS_LENGTH);
				elseif (preg_match('/[\\+\\/]/', $inslug))
					$errors['slug']=qa_lang_sub('admin/slug_bad_chars', '+ /');
				elseif ( (!isset($inparentid)) && qa_admin_is_slug_reserved($inslug)) // only top level is a problem
					$errors['slug']=qa_lang('admin/slug_reserved');
				elseif (isset($matchcategoryid) && strcmp($matchcategoryid, @$editcategory['categoryid']))
					$errors['slug']=qa_lang('admin/category_already_used');
				elseif (isset($matchpage))
					$errors['slug']=qa_lang('admin/page_already_used');
				else
					unset($errors['slug']);

				if (isset($editcategory['categoryid']) || !isset($errors['slug'])) // don't try other options if editing existing category
					break;
			}

		//	Perform appropriate database action

			if (empty($errors)) {
				if (isset($editcategory['categoryid'])) { // changing existing category
					qa_db_category_rename($editcategory['categoryid'], $inname, $inslug);

					$recalc=false;

					if ($setparent) {
						qa_db_category_set_parent($editcategory['categoryid'], $inparentid);
						$recalc=true;
					} else {
						qa_db_category_set_content($editcategory['categoryid'], $incontent);
						qa_db_category_set_position($editcategory['categoryid'], $inposition);
						$recalc=($hassubcategory && ($inslug !== $editcategory['tags']));
					}

					qa_redirect(qa_request(), array('edit' => $editcategory['categoryid'], 'saved' => true, 'recalc' => (int)$recalc));

				} else { // creating a new one
					$categoryid=qa_db_category_create($inparentid, $inname, $inslug);

					qa_db_category_set_content($categoryid, $incontent);

					if (isset($inposition))
						qa_db_category_set_position($categoryid, $inposition);

					qa_redirect(qa_request(), array('edit' => $inparentid, 'added' => true));
				}
			}
		}
	}


//	Prepare content for theme

	$qa_content=qa_content_prepare();

	$qa_content['title']=qa_lang_html('admin/admin_title').' - '.qa_lang_html('admin/categories_title');
	$qa_content['error']=$securityexpired ? qa_lang_html('admin/form_security_expired') : qa_admin_page_error();

	if ($setmissing) {
		$qa_content['form']=array(
			'tags' => 'method="post" action="'.qa_path_html(qa_request()).'"',

			'style' => 'tall',

			'fields' => array(
				'reassign' => array(
					'label' => isset($editcategory)
						? qa_lang_html_sub('admin/category_no_sub_to', qa_html($editcategory['title']))
						: qa_lang_html('admin/category_none_to'),
					'loose' => true,
				),
			),

			'buttons' => array(
				'save' => array(
					'tags' => 'id="dosaveoptions"', // just used for qa_recalc_click()
					'label' => qa_lang_html('main/save_button'),
				),

				'cancel' => array(
					'tags' => 'name="docancel"',
					'label' => qa_lang_html('main/cancel_button'),
				),
			),

			'hidden' => array(
				'dosetmissing' => '1', // for IE
				'edit' => @$editcategory['categoryid'],
				'missing' => '1',
				'code' => qa_get_form_security_code('admin/categories'),
			),
		);

		qa_set_up_category_field($qa_content, $qa_content['form']['fields']['reassign'], 'reassign',
			$categories, @$editcategory['categoryid'], qa_opt('allow_no_category'), qa_opt('allow_no_sub_category'));


	} elseif (isset($editcategory)) {

		$qa_content['form']=array(
			'tags' => 'method="post" action="'.qa_path_html(qa_request()).'"',

			'style' => 'tall',

			'ok' => qa_get('saved') ? qa_lang_html('admin/category_saved') : (qa_get('added') ? qa_lang_html('admin/category_added') : null),

			'fields' => array(
				'name' => array(
					'id' => 'name_display',
					'tags' => 'name="name" id="name"',
					'label' => qa_lang_html(count($categories) ? 'admin/category_name' : 'admin/category_name_first'),
					'value' => qa_html(isset($inname) ? $inname : @$editcategory['title']),
					'error' => qa_html(@$errors['name']),
				),

				'questions' => array(),

				'delete' => array(),

				'reassign' => array(),

				'slug' => array(
					'id' => 'slug_display',
					'tags' => 'name="slug"',
					'label' => qa_lang_html('admin/category_slug'),
					'value' => qa_html(isset($inslug) ? $inslug : @$editcategory['tags']),
					'error' => qa_html(@$errors['slug']),
				),

				'content' => array(
					'id' => 'content_display',
					'tags' => 'name="content"',
					'label' => qa_lang_html('admin/category_description'),
					'value' => qa_html(isset($incontent) ? $incontent : @$editcategory['content']),
					'error' => qa_html(@$errors['content']),
					'rows' => 2,
				),
			),

			'buttons' => array(
				'save' => array(
					'tags' => 'id="dosaveoptions"', // just used for qa_recalc_click
					'label' => qa_lang_html(isset($editcategory['categoryid']) ? 'main/save_button' : 'admin/add_category_button'),
				),

				'cancel' => array(
					'tags' => 'name="docancel"',
					'label' => qa_lang_html('main/cancel_button'),
				),
			),

			'hidden' => array(
				'dosavecategory' => '1', // for IE
				'edit' => @$editcategory['categoryid'],
				'parent' =>  @$editcategory['parentid'],
				'setparent' => (int)$setparent,
				'code' => qa_get_form_security_code('admin/categories'),
			),
		);


		if ($setparent) {
			unset($qa_content['form']['fields']['delete']);
			unset($qa_content['form']['fields']['reassign']);
			unset($qa_content['form']['fields']['questions']);
			unset($qa_content['form']['fields']['content']);

			$qa_content['form']['fields']['parent']=array(
				'label' => qa_lang_html('admin/category_parent'),
			);

			$childdepth=qa_db_category_child_depth($editcategory['categoryid']);

			qa_set_up_category_field($qa_content, $qa_content['form']['fields']['parent'], 'parent',
				isset($incategories) ? $incategories : $categories, isset($inparentid) ? $inparentid : @$editcategory['parentid'],
				true, true, QA_CATEGORY_DEPTH-1-$childdepth, @$editcategory['categoryid']);

			$qa_content['form']['fields']['parent']['options']['']=qa_lang_html('admin/category_top_level');

			@$qa_content['form']['fields']['parent']['note'].=qa_lang_html_sub('admin/category_max_depth_x', QA_CATEGORY_DEPTH);

		} elseif (isset($editcategory['categoryid'])) { // existing category
			if ($hassubcategory) {
				$qa_content['form']['fields']['name']['note']=qa_lang_html('admin/category_no_delete_subs');
				unset($qa_content['form']['fields']['delete']);
				unset($qa_content['form']['fields']['reassign']);

			} else {
				$qa_content['form']['fields']['delete']=array(
					'tags' => 'name="dodelete" id="dodelete"',
					'label' =>
						'<span id="reassign_shown">'.qa_lang_html('admin/delete_category_reassign').'</span>'.
						'<span id="reassign_hidden" style="display:none;">'.qa_lang_html('admin/delete_category').'</span>',
					'value' => 0,
					'type' => 'checkbox',
				);

				$qa_content['form']['fields']['reassign']=array(
					'id' => 'reassign_display',
					'tags' => 'name="reassign"',
				);

				qa_set_up_category_field($qa_content, $qa_content['form']['fields']['reassign'], 'reassign',
					$categories, $editcategory['parentid'], true, true, null, $editcategory['categoryid']);
			}

			$qa_content['form']['fields']['questions']=array(
				'label' => qa_lang_html('admin/total_qs'),
				'type' => 'static',
				'value' => '<a href="'.qa_path_html('questions/'.qa_category_path_request($categories, $editcategory['categoryid'])).'">'.
								( ($editcategory['qcount']==1)
									? qa_lang_html_sub('main/1_question', '1', '1')
									: qa_lang_html_sub('main/x_questions', number_format($editcategory['qcount']))
								).'</a>',
			);

			if ($hassubcategory && !qa_opt('allow_no_sub_category')) {
				$nosubcount=qa_db_count_categoryid_qs($editcategory['categoryid']);

				if ($nosubcount)
					$qa_content['form']['fields']['questions']['error']=
						strtr(qa_lang_html('admin/category_no_sub_error'), array(
							'^q' => number_format($nosubcount),
							'^1' => '<a href="'.qa_path_html(qa_request(), array('edit' => $editcategory['categoryid'], 'missing' => 1)).'">',
							'^2' => '</a>',
						));
			}

			qa_set_display_rules($qa_content, array(
				'position_display' => '!dodelete',
				'slug_display' => '!dodelete',
				'content_display' => '!dodelete',
				'parent_display' => '!dodelete',
				'children_display' => '!dodelete',
				'reassign_display' => 'dodelete',
				'reassign_shown' => 'dodelete',
				'reassign_hidden' => '!dodelete',
			));

		} else { // new category
			unset($qa_content['form']['fields']['delete']);
			unset($qa_content['form']['fields']['reassign']);
			unset($qa_content['form']['fields']['slug']);
			unset($qa_content['form']['fields']['questions']);

			$qa_content['focusid']='name';
		}

		if (!$setparent) {
			$pathhtml=qa_category_path_html($categories, @$editcategory['parentid']);

			if (count($categories)) {
				$qa_content['form']['fields']['parent']=array(
					'id' => 'parent_display',
					'label' => qa_lang_html('admin/category_parent'),
					'type' => 'static',
					'value' => (strlen($pathhtml) ? $pathhtml : qa_lang_html('admin/category_top_level')),
				);

				$qa_content['form']['fields']['parent']['value']=
					'<a href="'.qa_path_html(qa_request(), array('edit' => @$editcategory['parentid'])).'">'.
					$qa_content['form']['fields']['parent']['value'].'</a>';

				if (isset($editcategory['categoryid']))
					$qa_content['form']['fields']['parent']['value'].=' - '.
						'<a href="'.qa_path_html(qa_request(), array('edit' => $editcategory['categoryid'], 'setparent' => 1)).
						'" style="white-space: nowrap;">'.qa_lang_html('admin/category_move_parent').'</a>';
			}

			$positionoptions=array();

			$previous=null;
			$passedself=false;

			foreach ($categories as $key => $category)
				if (!strcmp($category['parentid'], @$editcategory['parentid'])) {
					if (isset($previous))
						$positionhtml=qa_lang_html_sub('admin/after_x', qa_html($passedself ? $category['title'] : $previous['title']));
					else
						$positionhtml=qa_lang_html('admin/first');

					$positionoptions[$category['position']]=$positionhtml;

					if (!strcmp($category['categoryid'], @$editcategory['categoryid']))
						$passedself=true;

					$previous=$category;
				}

			if (isset($editcategory['position']))
				$positionvalue=$positionoptions[$editcategory['position']];

			else {
				$positionvalue=isset($previous) ? qa_lang_html_sub('admin/after_x', qa_html($previous['title'])) : qa_lang_html('admin/first');
				$positionoptions[1+@max(array_keys($positionoptions))]=$positionvalue;
			}

			$qa_content['form']['fields']['position']=array(
				'id' => 'position_display',
				'tags' => 'name="position"',
				'label' => qa_lang_html('admin/position'),
				'type' => 'select',
				'options' => $positionoptions,
				'value' => $positionvalue,
			);

			if (isset($editcategory['categoryid'])) {
				$catdepth=count(qa_category_path($categories, $editcategory['categoryid']));

				if ($catdepth<QA_CATEGORY_DEPTH) {
					$childrenhtml='';

					foreach ($categories as $category)
						if (!strcmp($category['parentid'], $editcategory['categoryid']))
							$childrenhtml.=(strlen($childrenhtml) ? ', ' : '').
								'<a href="'.qa_path_html(qa_request(), array('edit' => $category['categoryid'])).'">'.qa_html($category['title']).'</a>'.
								' ('.$category['qcount'].')';

					if (!strlen($childrenhtml))
						$childrenhtml=qa_lang_html('admin/category_no_subs');

					$childrenhtml.=' - <a href="'.qa_path_html(qa_request(), array('addsub' => $editcategory['categoryid'])).
						'" style="white-space: nowrap;"><b>'.qa_lang_html('admin/category_add_sub').'</b></a>';

					$qa_content['form']['fields']['children']=array(
						'id' => 'children_display',
						'label' => qa_lang_html('admin/category_subs'),
						'type' => 'static',
						'value' => $childrenhtml,
					);
				} else {
					$qa_content['form']['fields']['name']['note']=qa_lang_html_sub('admin/category_no_add_subs_x', QA_CATEGORY_DEPTH);
				}

			}
		}

	} else {
		$qa_content['form']=array(
			'tags' => 'method="post" action="'.qa_path_html(qa_request()).'"',

			'ok' => $savedoptions ? qa_lang_html('admin/options_saved') : null,

			'style' => 'tall',

			'fields' => array(
				'intro' => array(
					'label' => qa_lang_html('admin/categories_introduction'),
					'type' => 'static',
				),
			),

			'buttons' => array(
				'save' => array(
					'tags' => 'name="dosaveoptions" id="dosaveoptions"',
					'label' => qa_lang_html('main/save_button'),
				),

				'add' => array(
					'tags' => 'name="doaddcategory"',
					'label' => qa_lang_html('admin/add_category_button'),
				),
			),

			'hidden' => array(
				'code' => qa_get_form_security_code('admin/categories'),
			),
		);

		if (count($categories)) {
			unset($qa_content['form']['fields']['intro']);

			$navcategoryhtml='';

			foreach ($categories as $category)
				if (!isset($category['parentid']))
					$navcategoryhtml.='<a href="'.qa_path_html('admin/categories', array('edit' => $category['categoryid'])).'">'.
						qa_html($category['title']).'</a> - '.qa_lang_html_sub('main/x_questions', $category['qcount']).'<br/>';

			$qa_content['form']['fields']['nav']=array(
				'label' => qa_lang_html('admin/top_level_categories'),
				'type' => 'static',
				'value' => $navcategoryhtml,
			);

			$qa_content['form']['fields']['allow_no_category']=array(
				'label' => qa_lang_html('options/allow_no_category'),
				'tags' => 'name="option_allow_no_category"',
				'type' => 'checkbox',
				'value' => qa_opt('allow_no_category'),
			);

			if (!qa_opt('allow_no_category')) {
				$nocatcount=qa_db_count_categoryid_qs(null);

				if ($nocatcount)
					$qa_content['form']['fields']['allow_no_category']['error']=
						strtr(qa_lang_html('admin/category_none_error'), array(
							'^q' => number_format($nocatcount),
							'^1' => '<a href="'.qa_path_html(qa_request(), array('missing' => 1)).'">',
							'^2' => '</a>',
						));
			}

			$qa_content['form']['fields']['allow_no_sub_category']=array(
				'label' => qa_lang_html('options/allow_no_sub_category'),
				'tags' => 'name="option_allow_no_sub_category"',
				'type' => 'checkbox',
				'value' => qa_opt('allow_no_sub_category'),
			);

		} else
			unset($qa_content['form']['buttons']['save']);
	}

	if (qa_get('recalc')) {
		$qa_content['form']['ok']='<span id="recalc_ok">'.qa_lang_html('admin/recalc_categories').'</span>';
		$qa_content['form']['hidden']['code_recalc']=qa_get_form_security_code('admin/recalc');

		$qa_content['script_rel'][]='qa-content/qa-admin.js?'.QA_VERSION;
		$qa_content['script_var']['qa_warning_recalc']=qa_lang('admin/stop_recalc_warning');

		$qa_content['script_onloads'][]=array(
			"qa_recalc_click('dorecalccategories', document.getElementById('dosaveoptions'), null, 'recalc_ok');"
		);
	}

	$qa_content['navigation']['sub']=qa_admin_sub_navigation();


	return $qa_content;


/*
	Omit PHP closing tag to help avoid accidental output
*/