<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Replyvane → Support: lets site owners send suggestions, bug reports and
 * questions (with screenshots or log files) to the plugin's developer.
 *
 * Reports are saved on the site (so the owner can see what they sent) and
 * emailed to REPLYVANE_REPORTS_EMAIL. The developer can also collect them
 * centrally by setting REPLYVANE_REPORTS_WEBHOOK. Both are defined in
 * replyvane-chat-support.php and can be overridden in wp-config.php or with the
 * replyvane_reports_email / replyvane_reports_webhook filters.
 */
class Replyvane_Support {

	const SLUG      = 'replyvane-support';
	const POST_TYPE = 'replyvane_report';
	const MAX_FILES = 3;
	const MAX_BYTES = 5242880; // 5 MB per file.

	public static function hooks() {
		add_action( 'init', array( __CLASS__, 'register' ) );
		if ( is_admin() ) {
			add_action( 'admin_menu', array( __CLASS__, 'menu' ), 30 );
			add_action( 'admin_post_replyvane_support', array( __CLASS__, 'handle' ) );
			add_action( 'admin_enqueue_scripts', array( __CLASS__, 'assets' ) );
		}
	}

	public static function assets( $hook ) {
		if ( false === strpos( (string) $hook, self::SLUG ) ) {
			return;
		}
		wp_enqueue_script( 'replyvane-support', REPLYVANE_URL . 'assets/admin-support.js', array(), REPLYVANE_VERSION, true );
	}

	public static function register() {
		register_post_type(
			self::POST_TYPE,
			array(
				'public'       => false,
				'show_ui'      => false,
				'label'        => 'Chatbot support reports',
				'supports'     => array( 'title', 'editor' ),
				'capabilities' => array( 'create_posts' => 'do_not_allow' ),
				'map_meta_cap' => true,
			)
		);
	}

	public static function menu() {
		add_submenu_page( 'replyvane', 'Support', 'Support', 'manage_options', self::SLUG, array( __CLASS__, 'render' ) );
	}

	public static function destination() {
		$email = self::constant_value( array( 'REPLYVANE_REPORTS_EMAIL', 'CHAT_SUPPORT_REPORTS_EMAIL', 'RHC_FAQ_SUPPORT_EMAIL' ) );
		return (string) apply_filters( 'replyvane_reports_email', $email );
	}

	public static function webhook() {
		$hook = self::constant_value( array( 'REPLYVANE_REPORTS_WEBHOOK', 'CHAT_SUPPORT_REPORTS_WEBHOOK', 'RHC_FAQ_SUPPORT_WEBHOOK' ) );
		return (string) apply_filters( 'replyvane_reports_webhook', $hook );
	}

	/** First non-empty value among wp-config.php constants (current name first, then names used by earlier builds). */
	private static function constant_value( array $names ) {
		foreach ( $names as $name ) {
			if ( defined( $name ) && constant( $name ) ) {
				return (string) constant( $name );
			}
		}
		return '';
	}

	private static function url( array $args = array() ) {
		return add_query_arg( array_merge( array( 'page' => self::SLUG ), $args ), admin_url( 'admin.php' ) );
	}

	/** Technical details that help fix problems. No visitor or customer data. */
	public static function system_info() {
		global $wpdb, $wp_version;
		$theme   = wp_get_theme();
		$plugins = array();
		foreach ( (array) get_option( 'active_plugins', array() ) as $file ) {
			$data      = get_file_data( WP_PLUGIN_DIR . '/' . $file, array( 'Name' => 'Plugin Name', 'Version' => 'Version' ) );
			$plugins[] = ( $data['Name'] ? $data['Name'] : $file ) . ( $data['Version'] ? ' ' . $data['Version'] : '' );
		}
		$kb    = Replyvane_Knowledge::stats();
		$lines = array(
			'Site'                 => home_url(),
			'Plugin version'       => REPLYVANE_VERSION,
			'WordPress'            => $wp_version . ( is_multisite() ? ' (multisite)' : '' ),
			'PHP'                  => PHP_VERSION,
			'Database'             => $wpdb->db_version(),
			'Theme'                => $theme->get( 'Name' ) . ' ' . $theme->get( 'Version' ),
			'Permalinks'           => get_option( 'permalink_structure' ) ? get_option( 'permalink_structure' ) : 'Plain',
			'WP-Cron'              => defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ? 'Disabled' : 'Enabled',
			'Answer engine'        => Replyvane_AI::enabled() ? Replyvane_AI::label() : ( 'wp_ai' === Replyvane_Plugin::get( 'engine' ) ? 'WordPress AI chosen, but not available (needs WordPress 7.0+)' : 'Built-in' ),
			'Live chat'            => Replyvane_Plugin::get( 'live_enabled' ) ? 'On' : 'Off',
			'Who sees the chat'    => Replyvane_Plugin::admins_only() ? 'Administrators only' : 'Everyone',
			'Pages read'           => $kb['pages'] . ' (last full scan: ' . ( $kb['last_indexed'] ? $kb['last_indexed'] : 'never' ) . ')',
			'FAQ questions'        => count( Replyvane_Store::items() ),
			'Active plugins'       => implode( ', ', $plugins ),
		);
		$out = '';
		foreach ( $lines as $k => $v ) {
			$out .= $k . ': ' . $v . "\n";
		}
		return trim( $out );
	}

	/** Saves attachments in a folder that can't be opened from the web. */
	private static function store_files() {
		$saved = array();
		if ( empty( $_FILES['files']['name'] ) || ! is_array( $_FILES['files']['name'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			return $saved;
		}
		require_once ABSPATH . 'wp-admin/includes/file.php';
		$dir_filter = function ( $dirs ) {
			$dirs['subdir'] = '/replyvane-support';
			$dirs['path']   = $dirs['basedir'] . '/replyvane-support';
			$dirs['url']    = $dirs['baseurl'] . '/replyvane-support';
			return $dirs;
		};
		add_filter( 'upload_dir', $dir_filter );
		$base = wp_upload_dir();
		wp_mkdir_p( $base['path'] );
		if ( ! file_exists( $base['path'] . '/.htaccess' ) ) {
			file_put_contents( $base['path'] . '/.htaccess', "Require all denied\nDeny from all\n" ); // phpcs:ignore WordPress.WP.AlternativeFunctions
			file_put_contents( $base['path'] . '/index.php', "<?php // Silence.\n" ); // phpcs:ignore WordPress.WP.AlternativeFunctions
		}
		$mimes = array(
			'jpg|jpeg' => 'image/jpeg',
			'png'      => 'image/png',
			'gif'      => 'image/gif',
			'webp'     => 'image/webp',
			'pdf'      => 'application/pdf',
			'txt|log'  => 'text/plain',
		);
		$files = $_FILES['files']; // phpcs:ignore WordPress.Security.NonceVerification,WordPress.Security.ValidatedSanitizedInput
		$count = min( self::MAX_FILES, count( $files['name'] ) );
		for ( $i = 0; $i < $count; $i++ ) {
			if ( empty( $files['tmp_name'][ $i ] ) || UPLOAD_ERR_OK !== (int) $files['error'][ $i ] || (int) $files['size'][ $i ] > self::MAX_BYTES ) {
				continue;
			}
			$one    = array(
				'name'     => wp_unique_filename( $base['path'], wp_generate_password( 8, false ) . '-' . sanitize_file_name( $files['name'][ $i ] ) ),
				'type'     => $files['type'][ $i ],
				'tmp_name' => $files['tmp_name'][ $i ],
				'error'    => $files['error'][ $i ],
				'size'     => $files['size'][ $i ],
			);
			$result = wp_handle_upload(
				$one,
				array(
					'test_form' => false,
					'mimes'     => $mimes,
				)
			);
			if ( ! empty( $result['file'] ) ) {
				$saved[] = $result['file'];
			}
		}
		remove_filter( 'upload_dir', $dir_filter );
		return $saved;
	}

	public static function handle() {
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( 'You are not allowed to do this.' );
		}
		check_admin_referer( 'replyvane_support' );
		$types    = array(
			'suggestion' => 'Suggestion',
			'bug'        => 'Bug report',
			'question'   => 'Question',
		);
		$type     = isset( $_POST['type'] ) ? sanitize_key( wp_unslash( $_POST['type'] ) ) : '';
		$type     = isset( $types[ $type ] ) ? $type : 'suggestion';
		$subject  = isset( $_POST['subject'] ) ? mb_substr( sanitize_text_field( wp_unslash( $_POST['subject'] ) ), 0, 150 ) : '';
		$details  = isset( $_POST['details'] ) ? mb_substr( sanitize_textarea_field( wp_unslash( $_POST['details'] ) ), 0, 8000 ) : '';
		$steps    = isset( $_POST['steps'] ) ? mb_substr( sanitize_textarea_field( wp_unslash( $_POST['steps'] ) ), 0, 4000 ) : '';
		$severity = isset( $_POST['severity'] ) && in_array( $_POST['severity'], array( 'low', 'medium', 'high' ), true ) ? sanitize_key( $_POST['severity'] ) : 'medium';
		$info     = ! empty( $_POST['include_info'] ) ? self::system_info() : '';

		if ( '' === $subject || '' === $details ) {
			set_transient( 'replyvane_support_msg_' . get_current_user_id(), array( 'error', 'Please fill in a subject and a description.' ), 120 );
			wp_safe_redirect( self::url() );
			exit;
		}

		$files = self::store_files();
		$user  = wp_get_current_user();
		$id    = wp_insert_post(
			array(
				'post_type'    => self::POST_TYPE,
				'post_status'  => 'publish',
				'post_title'   => $subject,
				'post_content' => $details,
			)
		);
		update_post_meta( $id, 'type', $type );
		update_post_meta( $id, 'severity', 'bug' === $type ? $severity : '' );
		update_post_meta( $id, 'steps', $steps );
		update_post_meta( $id, 'system_info', $info );
		update_post_meta( $id, 'files', $files );

		// Email to the developer's support inbox.
		$site  = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
		$lines = array(
			$types[ $type ] . ' from ' . $site . ' (' . home_url() . ')',
			'Sent by: ' . $user->display_name . ' <' . $user->user_email . '>',
		);
		if ( 'bug' === $type ) {
			$lines[] = 'How serious: ' . ucfirst( $severity );
		}
		$lines[] = '';
		$lines[] = 'Subject: ' . $subject;
		$lines[] = '';
		$lines[] = $details;
		if ( '' !== $steps ) {
			$lines[] = '';
			$lines[] = 'Steps to reproduce:';
			$lines[] = $steps;
		}
		if ( '' !== $info ) {
			$lines[] = '';
			$lines[] = '--- System information ---';
			$lines[] = $info;
		}
		$text = implode( "\n", $lines );

		$sent_mail = false;
		$to        = self::destination();
		if ( is_email( $to ) ) {
			$headers   = is_email( $user->user_email ) ? array( 'Reply-To: ' . $user->display_name . ' <' . $user->user_email . '>' ) : array();
			$sent_mail = wp_mail( $to, '[Replyvane Chat Support] ' . $types[ $type ] . ': ' . $subject . ' (' . $site . ')', $text, $headers, $files );
		}
		$sent_hook = false;
		$hook      = self::webhook();
		if ( $hook && wp_http_validate_url( $hook ) ) {
			$res       = wp_remote_post(
				$hook,
				array(
					'timeout' => 15,
					'headers' => array( 'Content-Type' => 'application/json' ),
					'body'    => wp_json_encode(
						array(
							'type'        => $type,
							'severity'    => 'bug' === $type ? $severity : '',
							'subject'     => $subject,
							'details'     => $details,
							'steps'       => $steps,
							'system_info' => $info,
							'site'        => home_url(),
							'reporter'    => array(
								'name'  => $user->display_name,
								'email' => $user->user_email,
							),
							'files'       => array_map( 'basename', $files ),
						)
					),
				)
			);
			$sent_hook = ! is_wp_error( $res ) && (int) wp_remote_retrieve_response_code( $res ) < 300;
		}
		$status = $sent_mail || $sent_hook ? 'sent' : 'saved';
		update_post_meta( $id, 'status', $status );

		set_transient(
			'replyvane_support_msg_' . get_current_user_id(),
			'sent' === $status
				? array( 'success', 'Thank you! Your ' . strtolower( $types[ $type ] ) . ' was sent to the plugin\'s support team. Replies come to ' . $user->user_email . '.' )
				: array( 'warning', 'Your ' . strtolower( $types[ $type ] ) . ' was saved on this site, but it could not be sent because no support address is set up or the email failed. See the note on this page.' ),
			120
		);
		wp_safe_redirect( self::url() );
		exit;
	}

	public static function render() {
		$view = isset( $_GET['report'] ) ? absint( $_GET['report'] ) : 0; // phpcs:ignore WordPress.Security.NonceVerification
		$msg  = get_transient( 'replyvane_support_msg_' . get_current_user_id() );
		if ( $msg ) {
			delete_transient( 'replyvane_support_msg_' . get_current_user_id() );
		}
		echo '<div class="wrap"><h1>Support</h1>';
		if ( is_array( $msg ) ) {
			printf( '<div class="notice notice-%s is-dismissible"><p>%s</p></div>', esc_attr( $msg[0] ), esc_html( $msg[1] ) );
		}
		if ( $view ) {
			self::render_report( $view );
			echo '</div>';
			return;
		}
		$user = wp_get_current_user();
		?>
		<p style="max-width:780px">Help us improve the chatbot. Send a suggestion, report a problem, or ask a question. Screenshots help a lot with problems.</p>
		<?php if ( ! is_email( self::destination() ) && ! self::webhook() ) : ?>
			<div class="notice notice-warning inline"><p><strong>No support address is set up yet</strong>, so reports are saved on this site only. The plugin's developer sets it in <code>replyvane-chat-support.php</code> (<code>REPLYVANE_REPORTS_EMAIL</code>).</p></div>
		<?php endif; ?>

		<form method="post" enctype="multipart/form-data" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" style="max-width:780px">
			<input type="hidden" name="action" value="replyvane_support">
			<?php wp_nonce_field( 'replyvane_support' ); ?>
			<table class="form-table" role="presentation">
				<tr><th scope="row">What is it?</th><td>
					<label style="margin-right:14px"><input type="radio" name="type" value="suggestion" checked> Suggestion or idea</label>
					<label style="margin-right:14px"><input type="radio" name="type" value="bug"> Bug or error</label>
					<label><input type="radio" name="type" value="question"> Question</label>
				</td></tr>
				<tr><th scope="row"><label for="sp-subject">Subject</label></th><td><input type="text" id="sp-subject" name="subject" class="large-text" maxlength="150" required placeholder="e.g. Chat button covers my cookie banner"></td></tr>
				<tr><th scope="row"><label for="sp-details">Description</label></th><td><textarea id="sp-details" name="details" rows="7" class="large-text" required placeholder="What would you like to see, or what went wrong? What did you expect to happen?"></textarea></td></tr>
				<tr class="sp-bug"><th scope="row"><label for="sp-steps">Steps to reproduce</label></th><td><textarea id="sp-steps" name="steps" rows="4" class="large-text" placeholder="1. Open the home page&#10;2. Click the chat button&#10;3. …"></textarea></td></tr>
				<tr class="sp-bug"><th scope="row">How serious?</th><td>
					<label style="margin-right:14px"><input type="radio" name="severity" value="low"> Minor</label>
					<label style="margin-right:14px"><input type="radio" name="severity" value="medium" checked> Annoying</label>
					<label><input type="radio" name="severity" value="high"> Chat doesn't work</label>
				</td></tr>
				<tr><th scope="row"><label for="sp-files">Screenshots or files</label></th><td>
					<input type="file" id="sp-files" name="files[]" multiple accept=".png,.jpg,.jpeg,.gif,.webp,.pdf,.txt,.log">
					<p class="description">Up to <?php echo esc_html( self::MAX_FILES ); ?> files, 5 MB each: images, PDF, or .txt/.log files. They are stored in a private folder on this site and attached to the email.</p>
				</td></tr>
				<tr><th scope="row">Technical details</th><td>
					<label><input type="checkbox" name="include_info" value="1" checked> Include technical details about this site (recommended for problems)</label>
					<details style="margin-top:6px"><summary style="cursor:pointer">See exactly what is included</summary><textarea readonly rows="10" class="large-text code" style="margin-top:6px"><?php echo esc_textarea( self::system_info() ); ?></textarea></details>
					<p class="description">Versions, theme, active plugins and chatbot settings. No visitor, customer or chat data.</p>
				</td></tr>
			</table>
			<p class="description">Replies will go to <?php echo esc_html( $user->user_email ); ?>.</p>
			<?php submit_button( 'Send' ); ?>
		</form>
		<?php
		self::render_list();
		echo '</div>';
	}

	private static function render_list() {
		$reports = get_posts(
			array(
				'post_type'      => self::POST_TYPE,
				'posts_per_page' => 50,
				'post_status'    => 'publish',
			)
		);
		echo '<h2>Sent from this site</h2>';
		if ( empty( $reports ) ) {
			echo '<p class="description">Nothing yet.</p>';
			return;
		}
		echo '<table class="widefat striped" style="max-width:900px"><thead><tr><th style="width:150px">Date</th><th style="width:120px">Type</th><th>Subject</th><th style="width:170px">Status</th></tr></thead><tbody>';
		$labels = array(
			'suggestion' => 'Suggestion',
			'bug'        => 'Bug report',
			'question'   => 'Question',
		);
		foreach ( $reports as $r ) {
			$type   = get_post_meta( $r->ID, 'type', true );
			$status = get_post_meta( $r->ID, 'status', true );
			printf(
				'<tr><td>%s</td><td>%s</td><td><a href="%s">%s</a></td><td>%s</td></tr>',
				esc_html( get_the_date( 'M j, Y g:i a', $r ) ),
				esc_html( isset( $labels[ $type ] ) ? $labels[ $type ] : $type ),
				esc_url( self::url( array( 'report' => $r->ID ) ) ),
				esc_html( $r->post_title ),
				esc_html( 'sent' === $status ? 'Sent to support' : 'Saved here only' )
			);
		}
		echo '</tbody></table>';
	}

	private static function render_report( $id ) {
		$r = get_post( $id );
		echo '<p><a href="' . esc_url( self::url() ) . '">&larr; Support</a></p>';
		if ( ! $r || self::POST_TYPE !== $r->post_type ) {
			echo '<p>Report not found.</p>';
			return;
		}
		$steps = get_post_meta( $id, 'steps', true );
		$info  = get_post_meta( $id, 'system_info', true );
		$files = (array) get_post_meta( $id, 'files', true );
		echo '<h2>' . esc_html( $r->post_title ) . '</h2>';
		echo '<p class="description">' . esc_html( get_the_date( 'M j, Y g:i a', $r ) . ' · ' . ( 'sent' === get_post_meta( $id, 'status', true ) ? 'Sent to support' : 'Saved here only' ) ) . '</p>';
		echo '<div style="max-width:780px;background:#fff;border:1px solid #c3c4c7;padding:12px 16px;white-space:pre-wrap">' . esc_html( $r->post_content ) . '</div>';
		if ( $steps ) {
			echo '<h3>Steps to reproduce</h3><div style="max-width:780px;white-space:pre-wrap">' . esc_html( $steps ) . '</div>';
		}
		if ( array_filter( $files ) ) {
			echo '<h3>Attached files</h3><ul style="list-style:disc;margin-left:20px">';
			foreach ( array_filter( $files ) as $f ) {
				echo '<li>' . esc_html( basename( $f ) ) . '</li>';
			}
			echo '</ul>';
		}
		if ( $info ) {
			echo '<h3>Technical details sent</h3><textarea readonly rows="10" class="large-text code" style="max-width:780px">' . esc_textarea( $info ) . '</textarea>';
		}
	}
}