<?php
namespace FrontGlut\Modules\Engage;

use FrontGlut\Support\Request;
use FrontGlut\Core\Ajax;
use FrontGlut\Core\Assets;
use FrontGlut\Core\Audit;
use FrontGlut\Core\Caps;
use FrontGlut\Core\Mailer;
use FrontGlut\Core\Notify;
use FrontGlut\Core\Settings;
use FrontGlut\Modules\Dashboard\Dashboard;
use FrontGlut\Modules\Forms\Forms;
use FrontGlut\Support\Ui;

defined( 'ABSPATH' ) || exit;

// phpcs:disable PluginCheck.Security.DirectDB.UnescapedDBParameter,WordPress.DB.DirectDatabaseQuery,WordPress.DB.SlowDBQuery -- queries target the plugin's own prefixed tables (names are constants, values are prepared).

/** Notifications centre, announcements, followers, knowledge base (+ messages & tickets). */
class Engage {

	public function boot() {
		( new Tickets() )->boot();
		( new Messages() )->boot();
		add_action( 'init', array( $this, 'register_cpts' ) );
		add_filter( 'frontglut_menu_items', array( $this, 'menu' ) );
		add_filter( 'frontglut_widgets', array( $this, 'widgets' ) );
		add_filter( 'frontglut_topbar_html', array( $this, 'bell' ) );
		add_filter( 'frontglut_managed_post_types', function ( $t ) {
			$t[] = 'frontglut_kb';
			return $t;
		} );
		add_filter( 'frontglut_can_submit', function ( $ok, $pt ) {
			return 'frontglut_kb' === $pt ? Caps::can( 'frontglut_moderate' ) : $ok;
		}, 10, 2 );
		add_filter( 'frontglut_can_edit_post', function ( $ok, $post ) {
			return 'frontglut_kb' === $post->post_type ? Caps::can( 'frontglut_moderate' ) : $ok;
		}, 10, 2 );
		add_filter( 'frontglut_post_status', function ( $s, $f, $uid, $pt ) {
			return 'frontglut_kb' === $pt ? 'publish' : $s;
		}, 10, 4 );
		add_filter( 'frontglut_section_for_post_type', function ( $s, $pt ) {
			return 'frontglut_kb' === $pt ? 'kb' : $s;
		}, 10, 2 );
		add_shortcode( 'frontglut_kb', array( $this, 'sc_kb' ) );
		add_shortcode( 'frontglut_follow', array( $this, 'sc_follow' ) );
		add_action( 'frontglut_daily', array( $this, 'digest' ) );
		foreach ( array( 'notif_read', 'notif_delete', 'notice_send', 'notice_delete', 'follow_toggle' ) as $a ) {
			Ajax::register( $a, array( $this, 'ajax_' . $a ), array( 'cap' => 'notice_send' === $a || 'notice_delete' === $a ? 'frontglut_send_notices' : null ) );
		}
		add_action( 'woocommerce_after_single_product_summary', function () {
			global $product;
			if ( $product && class_exists( '\FrontGlut\Modules\Vendors\Vendors' ) && ( $v = \FrontGlut\Modules\Vendors\Vendors::product_vendor( $product->get_id() ) ) ) {
				echo wp_kses( do_shortcode( '[frontglut_follow id="' . (int) $v . '" type="store"]' ), Ui::allowed_html() );
			}
		}, 5 );
		add_filter( 'the_content', function ( $c ) {
			if ( is_singular( 'post' ) && in_the_loop() && is_main_query() && get_post_meta( get_the_ID(), '_frontglut_form', true ) ) {
				$c .= do_shortcode( '[frontglut_follow id="' . (int) get_post_field( 'post_author', get_the_ID() ) . '" type="author"]' );
			}
			return $c;
		} );
	}

	public function register_cpts() {
		register_post_type( 'frontglut_kb', array( 'labels' => array( 'name' => __( 'Knowledge base', 'frontglut' ), 'singular_name' => __( 'Article', 'frontglut' ) ), 'public' => true, 'has_archive' => false, 'show_in_rest' => true, 'supports' => array( 'title', 'editor', 'thumbnail' ), 'rewrite' => array( 'slug' => 'help' ), 'show_in_menu' => 'frontglut', 'taxonomies' => array( 'frontglut_kb_cat' ) ) );
		register_taxonomy( 'frontglut_kb_cat', 'frontglut_kb', array( 'labels' => array( 'name' => __( 'KB categories', 'frontglut' ) ), 'hierarchical' => true, 'public' => true, 'show_in_rest' => true, 'rewrite' => array( 'slug' => 'help-topic' ) ) );
		register_post_type( 'frontglut_notice', array( 'labels' => array( 'name' => 'Announcements' ), 'public' => false, 'supports' => array( 'title', 'editor' ) ) );
		if ( ! get_option( 'frontglut_kb_form' ) || ! Forms::get( (int) get_option( 'frontglut_kb_form' ) ) ) {
			$id = Forms::save( array( 'type' => 'post', 'title' => 'Knowledge base article', 'settings' => Forms::post_settings( array( 'post_type' => 'frontglut_kb', 'status' => 'publish', 'editor' => 'lite', 'notify_admin' => 0, 'notify_user' => 0 ) ), 'fields' => array(
				Forms::f( 'title', 'text', __( 'Title', 'frontglut' ), array( 'required' => 1, 'storage' => 'post_title' ) ),
				Forms::f( 'content', 'editor', __( 'Answer', 'frontglut' ), array( 'required' => 1, 'storage' => 'post_content' ) ),
				Forms::f( 'topic', 'taxonomy', __( 'Topic', 'frontglut' ), array( 'storage' => 'tax', 'taxonomy' => 'frontglut_kb_cat', 'ui' => 'checkboxes' ) ),
			) ) );
			update_option( 'frontglut_kb_form', $id, false );
		}
	}

	public function menu( $i ) {
		$i['notifications'] = array( 'label' => __( 'Notifications', 'frontglut' ), 'icon' => 'bell', 'group' => 'comms', 'order' => 60, 'render' => array( $this, 'screen_notifications' ), 'badge' => array( 'FrontGlut\\Core\\Notify', 'unread' ) );
		$i['notices']       = array( 'label' => __( 'Announcements', 'frontglut' ), 'icon' => 'megaphone', 'group' => 'comms', 'order' => 64, 'cap' => 'frontglut_send_notices', 'render' => array( $this, 'screen_notices' ) );
		$i['kb']            = array( 'label' => __( 'Knowledge base', 'frontglut' ), 'icon' => 'book', 'group' => 'comms', 'order' => 65, 'cap' => 'frontglut_moderate', 'render' => function () {
			$posts = \FrontGlut\Core\Plugin::instance()->modules()->get( 'posts' );
			return $posts ? $posts->manage_screen( 'kb', 'frontglut_kb', __( 'Knowledge base', 'frontglut' ), (int) get_option( 'frontglut_kb_form' ) ) : '';
		} );
		return $i;
	}

	public function widgets( $w ) {
		$w['announcements'] = array( 'title' => __( 'Announcements', 'frontglut' ), 'order' => 3, 'size' => 2, 'render' => array( $this, 'widget_notices' ) );
		$w['recent_notifs'] = array( 'title' => __( 'Recent notifications', 'frontglut' ), 'order' => 45, 'size' => 1, 'render' => function () {
			$n = Notify::latest( get_current_user_id(), 5 );
			if ( ! $n ) {
				return '<p>' . esc_html__( 'You are all caught up.', 'frontglut' ) . '</p>';
			}
			$h = '<ul class="frontglut-checklist">';
			foreach ( $n as $x ) {
				$h .= '<li>' . ( $x['is_read'] ? '' : '<strong>' ) . ( $x['url'] ? '<a href="' . esc_url( $x['url'] ) . '">' . esc_html( $x['title'] ) . '</a>' : esc_html( $x['title'] ) ) . ( $x['is_read'] ? '' : '</strong>' ) . '</li>';
			}
			return $h . '</ul><p>' . Ui::btn( __( 'All notifications', 'frontglut' ), Dashboard::url( 'notifications' ), 'frontglut-sm' ) . '</p>';
		} );
		return $w;
	}

	public function bell( $h ) {
		$n = Notify::unread();
		return $h . '<a class="frontglut-icon-btn" href="' . esc_url( Dashboard::url( 'notifications' ) ) . '" aria-label="' . esc_attr__( 'Notifications', 'frontglut' ) . '">' . Ui::icon( 'bell' ) . ( $n ? '<i>' . (int) min( 99, $n ) . '</i>' : '' ) . '</a>';
	}

	/* ---------------- notifications ---------------- */
	public function screen_notifications() {
		$uid = get_current_user_id();
		$pg  = Request::page();
		$list = Notify::latest( $uid, 20, ( $pg - 1 ) * 20 );
		global $wpdb;
		$tot  = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->prefix}frontglut_notifications WHERE user_id = %d", $uid ) ); // phpcs:ignore WordPress.DB.PreparedSQL
		$rows = array();
		foreach ( $list as $n ) {
			$rows[] = array( 'msg' => ( $n['is_read'] ? '' : '<strong>' ) . ( $n['url'] ? '<a href="' . esc_url( $n['url'] ) . '">' . esc_html( $n['title'] ) . '</a>' : esc_html( $n['title'] ) ) . ( $n['is_read'] ? '' : '</strong>' ) . ( $n['message'] ? '<br><small>' . esc_html( $n['message'] ) . '</small>' : '' ), 'when' => Ui::date( $n['created'] ), 'act' => ( $n['is_read'] ? '' : Ui::action_btn( __( 'Mark read', 'frontglut' ), 'notif_read', array( 'id' => $n['id'] ) ) ) . Ui::action_btn( __( 'Delete', 'frontglut' ), 'notif_delete', array( 'id' => $n['id'] ), 'frontglut-danger', false, 'remove' ) );
		}
		return Ui::header( __( 'Notifications', 'frontglut' ), Ui::action_btn( __( 'Mark all as read', 'frontglut' ), 'notif_read', array( 'id' => 0 ) ) ) . Ui::table( array( 'msg' => __( 'Notification', 'frontglut' ), 'when' => __( 'When', 'frontglut' ), 'act' => '' ), $rows, array( 'empty' => __( 'No notifications.', 'frontglut' ) ) ) . Ui::pager( $tot, 20, $pg );
	}

	public function ajax_notif_read( $req ) {
		Notify::mark_read( get_current_user_id(), (int) ( $req['id'] ?? 0 ) );
		return array();
	}

	public function ajax_notif_delete( $req ) {
		global $wpdb;
		$wpdb->delete( $wpdb->prefix . 'frontglut_notifications', array( 'id' => (int) ( $req['id'] ?? 0 ), 'user_id' => get_current_user_id() ) );
		wp_cache_delete( 'frontglut_unread_' . get_current_user_id(), 'frontglut' );
		return array();
	}

	/* ---------------- announcements ---------------- */
	public function widget_notices() {
		$u = wp_get_current_user();
		$q = get_posts( array( 'post_type' => 'frontglut_notice', 'post_status' => 'publish', 'numberposts' => 20, 'orderby' => 'date', 'order' => 'DESC' ) );
		$h = '';
		$shown = 0;
		foreach ( $q as $p ) {
			$roles = (array) get_post_meta( $p->ID, '_frontglut_roles', true );
			if ( $roles && ! array_intersect( $roles, (array) $u->roles ) && ! current_user_can( 'manage_options' ) ) {
				continue;
			}
			$h .= '<div class="frontglut-notice"><strong>' . esc_html( $p->post_title ) . '</strong><br>' . wp_kses_post( wpautop( $p->post_content ) ) . '<small>' . esc_html( get_the_date( '', $p ) ) . '</small></div>';
			if ( ++$shown >= 3 ) {
				break;
			}
		}
		return $h;
	}

	public function screen_notices() {
		$roles = '<div class="frontglut-choices">';
		foreach ( wp_roles()->roles as $k => $r ) {
			$roles .= '<label class="frontglut-choice"><input type="checkbox" name="roles[]" value="' . esc_attr( $k ) . '"> ' . esc_html( translate_user_role( $r['name'] ) ) . '</label>';
		}
		$roles .= '</div>';
		$f = Ui::form_open( 'notice_send', array( 'after' => 'reload' ) ) . '<div class="frontglut-field"><label class="frontglut-label">' . esc_html__( 'Title', 'frontglut' ) . '</label><input class="frontglut-input" name="title" required></div><div class="frontglut-field"><label class="frontglut-label">' . esc_html__( 'Message', 'frontglut' ) . '</label><textarea class="frontglut-input" name="message" rows="4" required></textarea></div><div class="frontglut-field"><label class="frontglut-label">' . esc_html__( 'Audience (none = everyone)', 'frontglut' ) . '</label>' . $roles . '</div><div class="frontglut-field"><label class="frontglut-choice"><input type="checkbox" name="push" value="1" checked> ' . esc_html__( 'Also send a notification (bell) to each recipient', 'frontglut' ) . '</label></div><div class="frontglut-field"><label class="frontglut-choice"><input type="checkbox" name="email" value="1"> ' . esc_html__( 'Also email recipients', 'frontglut' ) . '</label></div>' . Ui::form_close( __( 'Publish announcement', 'frontglut' ) );
		$rows = array();
		foreach ( get_posts( array( 'post_type' => 'frontglut_notice', 'post_status' => 'publish', 'numberposts' => 30 ) ) as $p ) {
			$rows[] = array( 'title' => esc_html( $p->post_title ), 'aud' => esc_html( implode( ', ', (array) get_post_meta( $p->ID, '_frontglut_roles', true ) ) ?: __( 'Everyone', 'frontglut' ) ), 'date' => Ui::date( $p->post_date ), 'act' => Ui::action_btn( __( 'Delete', 'frontglut' ), 'notice_delete', array( 'id' => $p->ID ), 'frontglut-danger', true ) );
		}
		return Ui::header( __( 'Announcements', 'frontglut' ) ) . '<div class="frontglut-panel">' . $f . '</div>' . Ui::table( array( 'title' => __( 'Announcement', 'frontglut' ), 'aud' => __( 'Audience', 'frontglut' ), 'date' => __( 'Date', 'frontglut' ), 'act' => '' ), $rows, array( 'empty' => __( 'No announcements yet.', 'frontglut' ) ) );
	}

	public function ajax_notice_send( $req ) {
		$title = sanitize_text_field( $req['title'] ?? '' );
		$msg   = sanitize_textarea_field( $req['message'] ?? '' );
		if ( '' === $title || '' === $msg ) {
			Ajax::fail( __( 'Title and message are required.', 'frontglut' ) );
		}
		$roles = array_values( array_intersect( array_map( 'sanitize_key', (array) ( $req['roles'] ?? array() ) ), array_keys( wp_roles()->roles ) ) );
		$id = wp_insert_post( array( 'post_type' => 'frontglut_notice', 'post_status' => 'publish', 'post_title' => $title, 'post_content' => $msg ) );
		update_post_meta( $id, '_frontglut_roles', $roles );
		$args = array( 'fields' => array( 'ID', 'user_email' ), 'number' => 500 );
		if ( $roles ) {
			$args['role__in'] = $roles;
		}
		$n = 0;
		if ( ! empty( $req['push'] ) || ! empty( $req['email'] ) ) {
			foreach ( get_users( $args ) as $u ) {
				if ( ! empty( $req['push'] ) ) {
					Notify::send( $u->ID, $title, wp_trim_words( $msg, 20 ), Dashboard::url(), 'announce' );
				}
				if ( ! empty( $req['email'] ) ) {
					Mailer::send( $u->user_email, $title, $msg );
				}
				$n++;
			}
		}
		Audit::log( 'announcement', (string) $id, "$n recipients" );
		/* translators: %s: value. */
		return array( 'message' => sprintf( __( 'Published to %d recipients.', 'frontglut' ), $n ) );
	}

	public function ajax_notice_delete( $req ) {
		$p = get_post( (int) ( $req['id'] ?? 0 ) );
		if ( $p && 'frontglut_notice' === $p->post_type ) {
			wp_delete_post( $p->ID, true );
		}
		return array( 'message' => __( 'Deleted.', 'frontglut' ) );
	}

	/* ---------------- followers ---------------- */
	public function sc_follow( $atts ) {
		$a = shortcode_atts( array( 'id' => 0, 'type' => 'author' ), $atts );
		$id = (int) $a['id'];
		if ( ! $id || ! get_userdata( $id ) ) {
			return '';
		}
		Assets::need();
		$type = 'store' === $a['type'] ? 'store' : 'author';
		if ( ! is_user_logged_in() ) {
			return '<p class="frontglut-follow"><a class="frontglut-btn frontglut-sm" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . esc_html( 'store' === $type ? __( 'Log in to follow this store', 'frontglut' ) : __( 'Log in to follow this author', 'frontglut' ) ) . '</a></p>';
		}
		global $wpdb;
		$on = (bool) $wpdb->get_var( $wpdb->prepare( "SELECT id FROM {$wpdb->prefix}frontglut_follows WHERE user_id = %d AND target_id = %d AND type = %s", get_current_user_id(), $id, $type ) ); // phpcs:ignore WordPress.DB.PreparedSQL
		$cnt = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->prefix}frontglut_follows WHERE target_id = %d AND type = %s", $id, $type ) ); // phpcs:ignore WordPress.DB.PreparedSQL
		/* translators: %s: value. */
		return '<p class="frontglut-follow"><button type="button" class="frontglut-btn frontglut-sm ' . ( $on ? '' : 'frontglut-primary' ) . '" data-frontglut-do="follow_toggle" data-id="' . $id . '" data-type="' . esc_attr( $type ) . '" data-frontglut-after="reload">' . esc_html( $on ? __( 'Following ✓', 'frontglut' ) : __( 'Follow', 'frontglut' ) ) . '</button> <small>' . esc_html( sprintf( _n( '%d follower', '%d followers', $cnt, 'frontglut' ), $cnt ) ) . '</small></p>';
	}

	public function ajax_follow_toggle( $req ) {
		global $wpdb;
		$id   = (int) ( $req['id'] ?? 0 );
		$type = 'store' === ( $req['type'] ?? '' ) ? 'store' : 'author';
		$uid  = get_current_user_id();
		if ( ! $id || $id === $uid || ! get_userdata( $id ) ) {
			Ajax::fail( __( 'Invalid request.', 'frontglut' ) );
		}
		$t = $wpdb->prefix . 'frontglut_follows';
		if ( $wpdb->get_var( $wpdb->prepare( "SELECT id FROM $t WHERE user_id = %d AND target_id = %d AND type = %s", $uid, $id, $type ) ) ) { // phpcs:ignore WordPress.DB.PreparedSQL
			$wpdb->delete( $t, array( 'user_id' => $uid, 'target_id' => $id, 'type' => $type ) );
			return array( 'message' => __( 'Unfollowed.', 'frontglut' ) );
		}
		$wpdb->insert( $t, array( 'user_id' => $uid, 'target_id' => $id, 'type' => $type, 'created' => current_time( 'mysql', true ) ) );
		/* translators: %s: value. */
		Notify::send( $id, sprintf( __( '%s followed you', 'frontglut' ), wp_get_current_user()->display_name ), '', Dashboard::url() );
		return array( 'message' => __( 'Following!', 'frontglut' ) );
	}

	/** Daily digest of new products/posts from followed stores/authors. */
	public function digest() {
		global $wpdb;
		$since = gmdate( 'Y-m-d H:i:s', time() - DAY_IN_SECONDS );
		$rows  = $wpdb->get_results( "SELECT user_id, target_id, type FROM {$wpdb->prefix}frontglut_follows", ARRAY_A ); // phpcs:ignore WordPress.DB.PreparedSQL
		$by    = array();
		foreach ( $rows as $r ) {
			$by[ $r['user_id'] ][] = $r;
		}
		foreach ( $by as $uid => $follows ) {
			$lines = array();
			foreach ( $follows as $f ) {
				$posts = get_posts( array( 'author' => $f['target_id'], 'post_type' => 'store' === $f['type'] ? 'product' : 'post', 'post_status' => 'publish', 'date_query' => array( array( 'after' => $since, 'column' => 'post_date_gmt' ) ), 'numberposts' => 5 ) );
				foreach ( $posts as $p ) {
					$lines[] = '• ' . get_the_title( $p ) . ' — ' . get_permalink( $p );
				}
			}
			$u = get_userdata( $uid );
			if ( $lines && $u ) {
				/* translators: %s: value. */
				Mailer::send( $u->user_email, sprintf( __( 'New from the stores and authors you follow — %s', 'frontglut' ), get_bloginfo( 'name' ) ), implode( "\n", $lines ) );
			}
		}
	}

	/* ---------------- knowledge base ---------------- */
	public function sc_kb( $atts ) {
		Assets::need();
		$q   = Request::route( 'kq', 'text', '' );
		$cat = Request::route( 'kc', 'int', 0 );
		$args = array( 'post_type' => 'frontglut_kb', 'post_status' => 'publish', 'posts_per_page' => 30, 's' => $q );
		if ( $cat ) {
			$args['tax_query'] = array( array( 'taxonomy' => 'frontglut_kb_cat', 'terms' => array( $cat ) ) );
		}
		$h = '<div class="frontglut-box frontglut-wide" style="max-width:900px"><form method="get" class="frontglut-filters"><input class="frontglut-input" type="search" name="kq" value="' . esc_attr( $q ) . '" placeholder="' . esc_attr__( 'Search help articles…', 'frontglut' ) . '"><button class="frontglut-btn">' . esc_html__( 'Search', 'frontglut' ) . '</button></form><div class="frontglut-pills">';
		$h .= '<a class="' . ( $cat ? '' : 'is-active' ) . '" href="' . esc_url( remove_query_arg( 'kc' ) ) . '">' . esc_html__( 'All', 'frontglut' ) . '</a>';
		foreach ( (array) get_terms( array( 'taxonomy' => 'frontglut_kb_cat', 'hide_empty' => true ) ) as $t ) {
			if ( ! is_wp_error( $t ) ) {
				$h .= '<a class="' . ( $cat === (int) $t->term_id ? 'is-active' : '' ) . '" href="' . esc_url( add_query_arg( 'kc', $t->term_id ) ) . '">' . esc_html( $t->name ) . '</a>';
			}
		}
		$h .= '</div>';
		$posts = get_posts( $args );
		foreach ( $posts as $p ) {
			$h .= '<article class="frontglut-panel"><h3><a href="' . esc_url( get_permalink( $p ) ) . '">' . esc_html( get_the_title( $p ) ) . '</a></h3><p>' . esc_html( wp_trim_words( wp_strip_all_tags( $p->post_content ), 30 ) ) . '</p></article>';
		}
		return $h . ( $posts ? '' : '<p>' . esc_html__( 'No articles found.', 'frontglut' ) . '</p>' ) . '</div>';
	}
}