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

/**
 * Returns the admin sections and the panes inside each one.
 *
 * @return array
 */
function cwp_ai_sections() {
	static $sections = null;

	if ( null !== $sections ) {
		return $sections;
	}

	$sections = apply_filters(
		'cwp_ai_sections',
		array(
			'home'          => array(
				'label' => 'Home',
				'icon'  => 'admin-home',
				'desc'  => 'How your assistant is doing, and what needs you',
				'panes' => array(
					'overview' => array(
						'label'  => 'Overview',
						'render' => 'cwp_ai_render_home',
						'order'  => 10,
					),
					'how'      => array(
						'label'  => 'How it works',
						'render' => 'cwp_ai_render_how_it_works',
						'order'  => 20,
					),
				),
			),
			'knowledge'     => array(
				'label' => 'Knowledge',
				'icon'  => 'welcome-learn-more',
				'desc'  => 'What your assistant knows and how it answers',
				'panes' => array(
					'entries' => array(
						'label'  => 'Entries',
						'render' => function () {
							cwp_ai_render_knowledge_pane( array( 'all' ) );
						},
						'order'  => 10,
					),
					'add'     => array(
						'label'  => 'Add and import',
						'render' => function () {
							cwp_ai_render_knowledge_pane( (array) apply_filters( 'cwp_ai_knowledge_add_panels', array( 'qa', 'csv-import' ) ) );
						},
						'order'  => 20,
					),
					'test'    => array(
						'label'  => 'Test answers',
						'render' => function () {
							$ctx = cwp_ai_admin_context();
							cwp_ai_render_vector_tab( $ctx['qa_pairs'] );
						},
						'order'  => 40,
					),
				),
			),
			'conversations' => array(
				'label' => 'Conversations',
				'icon'  => 'format-chat',
				'desc'  => 'Enquiries from your visitors',
				'panes' => array(
					'enquiries' => array(
						'label'  => 'Enquiries',
						'render' => 'cwp_ai_render_leads_entries',
						'order'  => 10,
					),
				),
			),
			'design'        => array(
				'label' => 'Design',
				'icon'  => 'art',
				'desc'  => 'How the chat looks and what it offers',
				'panes' => array(
					'look' => array(
						'label'  => 'Look and feel',
						'render' => 'cwp_ai_render_appearance_tab',
						'order'  => 10,
					),
					'form' => array(
						'label'  => 'Contact form',
						'render' => 'cwp_ai_render_form_setup',
						'order'  => 20,
					),
				),
			),
			'analytics'     => array(
				'label' => 'Analytics',
				'icon'  => 'chart-area',
				'desc'  => 'What visitors ask and do',
				'panes' => array(
					'overview' => array(
						'label'  => 'Overview',
						'render' => 'cwp_ai_render_analytics_tab',
						'order'  => 10,
					),
					'speed'    => array(
						'label'  => 'Site speed',
						'render' => 'cwp_ai_render_performance_tab',
						'order'  => 90,
					),
				),
			),
			'settings'      => array(
				'label' => 'Settings',
				'icon'  => 'admin-settings',
				'desc'  => 'Where it shows, who sees it and your account',
				'panes' => array(
					'general' => array(
						'label'  => 'General',
						'render' => 'cwp_ai_render_settings_general',
						'order'  => 10,
					),
					'account' => array(
						'label'  => 'Account',
						'render' => 'cwp_ai_render_settings_account',
						'order'  => 90,
					),
				),
			),
		)
	);

	foreach ( $sections as $key => $section ) {
		$panes = (array) ( $section['panes'] ?? array() );

		uasort(
			$panes,
			function ( $a, $b ) {
				return (int) ( $a['order'] ?? 50 ) <=> (int) ( $b['order'] ?? 50 );
			}
		);

		$sections[ $key ]['panes'] = $panes;
	}

	return $sections;
}

/**
 * Maps an old screen name, or a section name, to its section and pane.
 *
 * @param string $name Screen name.
 * @return array{0:string,1:string}
 */
function cwp_ai_route( $name ) {
	$map = (array) apply_filters(
		'cwp_ai_route_aliases',
		array(
			'setup'       => array( 'setup', '' ),
			'home'        => array( 'home', '' ),
			'knowledge'   => array( 'knowledge', '' ),
			'vector'      => array( 'knowledge', 'test' ),
			'leads'       => array( 'conversations', 'enquiries' ),
			'enquiries'   => array( 'conversations', 'enquiries' ),
			'appearance'  => array( 'design', 'look' ),
			'form'        => array( 'design', 'form' ),
			'analytics'   => array( 'analytics', '' ),
			'performance' => array( 'analytics', 'speed' ),
			'settings'    => array( 'settings', '' ),
			'usage'       => array( 'settings', 'account' ),
			'transfer'    => array( 'settings', 'account' ),
		)
	);

	if ( false !== strpos( $name, '/' ) ) {
		list( $section, $pane ) = explode( '/', $name, 2 );

		return isset( cwp_ai_sections()[ $section ] ) ? array( $section, sanitize_key( $pane ) ) : array( 'home', '' );
	}

	if ( isset( $map[ $name ] ) ) {
		return $map[ $name ];
	}

	return isset( cwp_ai_sections()[ $name ] ) ? array( $name, '' ) : array( 'home', '' );
}

/**
 * Returns the admin page slug for a section.
 *
 * @param string $section Section name.
 * @return string
 */
function cwp_ai_admin_slug( $section ) {
	return 'home' === $section ? 'cloudy-ai-chatbot' : 'cloudy-ai-chatbot-' . $section;
}

/**
 * Returns the admin address of a screen, accepting old screen names too.
 *
 * @param string $name Section, pane shortcut or old screen name.
 * @param string $pane Pane inside the section.
 * @return string
 */
function cwp_ai_admin_url( $name, $pane = '' ) {
	list( $section, $mapped ) = cwp_ai_route( $name );

	$pane = '' !== $pane ? $pane : $mapped;
	$url  = admin_url( 'admin.php?page=' . cwp_ai_admin_slug( $section ) );

	return '' !== $pane ? add_query_arg( 'pane', $pane, $url ) : $url;
}

/**
 * Tells whether an admin page hook belongs to this plugin.
 *
 * @param string $hook The admin page hook.
 * @return bool
 */
function cwp_ai_is_admin_screen( $hook ) {
	return 'toplevel_page_cloudy-ai-chatbot' === $hook || false !== strpos( (string) $hook, '_page_cloudy-ai-chatbot' );
}

/**
 * Returns the section being viewed.
 *
 * @return string
 */
function cwp_ai_current_tab() {
    // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only page switch.
	$page = isset( $_GET['page'] ) ? sanitize_key( wp_unslash( $_GET['page'] ) ) : '';
    // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only page switch.
	$step = isset( $_GET['step'] ) ? sanitize_key( wp_unslash( $_GET['step'] ) ) : '';

	if ( 'cloudy-ai-chatbot' === $page ) {
		return '' !== $step ? 'setup' : 'home';
	}

	$name = 0 === strpos( $page, 'cloudy-ai-chatbot-' ) ? substr( $page, strlen( 'cloudy-ai-chatbot-' ) ) : 'home';

	return 'setup' === $name ? 'setup' : cwp_ai_route( $name )[0];
}

/**
 * Returns the pane being viewed inside the current section.
 *
 * @return string
 */
function cwp_ai_current_pane() {
	$section = cwp_ai_current_tab();
	$panes   = cwp_ai_sections()[ $section ]['panes'] ?? array();
    // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only page switch.
	$pane = isset( $_GET['pane'] ) ? sanitize_key( wp_unslash( $_GET['pane'] ) ) : '';

	if ( isset( $panes[ $pane ] ) ) {
		return $pane;
	}

	$keys = array_keys( $panes );

	return $keys ? $keys[0] : '';
}

/**
 * Returns the sections and their menu labels.
 *
 * @return array
 */
function cwp_ai_admin_tab_labels() {
	return array_map(
		function ( $section ) {
			return (string) $section['label'];
		},
		cwp_ai_sections()
	);
}

add_action(
	'admin_init',
	function () {
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only redirect of an old address.
		$page = isset( $_GET['page'] ) ? sanitize_key( wp_unslash( $_GET['page'] ) ) : '';

		if ( 0 !== strpos( $page, 'cloudy-ai-chatbot-' ) ) {
			return;
		}

		$name = substr( $page, strlen( 'cloudy-ai-chatbot-' ) );

		if ( 'setup' === $name || isset( cwp_ai_sections()[ $name ] ) ) {
			return;
		}

		wp_safe_redirect( cwp_ai_admin_url( $name ) );
		exit;
	}
);

add_action(
	'admin_menu',
	function () {
		add_menu_page(
			'Cloudy AI Chatbot',
			'Cloudy AI Chatbot',
			'manage_options',
			'cloudy-ai-chatbot',
			'cwp_ai_render_admin_page',
			'dashicons-format-chat',
			30
		);

		foreach ( cwp_ai_admin_tab_labels() as $section => $label ) {
			add_submenu_page(
				'cloudy-ai-chatbot',
				$label,
				$label,
				'manage_options',
				cwp_ai_admin_slug( $section ),
				'cwp_ai_render_admin_page'
			);
		}

		$hidden = (array) apply_filters( 'cwp_ai_hidden_screens', array( 'setup', 'vector', 'leads', 'appearance', 'performance', 'transfer', 'usage' ) );

		foreach ( $hidden as $name ) {
			$hook = add_submenu_page( '', 'Cloudy AI Chatbot', 'Cloudy AI Chatbot', 'manage_options', 'cloudy-ai-chatbot-' . $name, 'cwp_ai_render_admin_page' );

			if ( $hook ) {
				add_action( 'load-' . $hook, 'cwp_ai_set_hidden_screen_title' );
			}
		}
	}
);

/**
 * Gives screens that are not in the menu a page title, which WordPress cannot find for them.
 */
function cwp_ai_set_hidden_screen_title() {
	global $title;

	if ( empty( $title ) ) {
		$title = 'Cloudy AI Chatbot'; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- WordPress reads the admin page title from this global.
	}
}

/**
 * Returns what several screens need, read once per page view.
 *
 * @return array
 */
function cwp_ai_admin_context() {
	static $ctx = null;

	if ( null === $ctx ) {
		$ctx = array(
			'qa_pairs' => (array) cwp_ai_knowledge()->all(),
		);
	}

	return $ctx;
}

/**
 * Prints the knowledge screen with only the panels that belong to one pane.
 *
 * @param string[] $panels Panel names to show.
 */
function cwp_ai_render_knowledge_pane( $panels ) {
	$ctx = cwp_ai_admin_context();

	echo '<div class="cwp-pane-only" data-panels="' . esc_attr( implode( ',', $panels ) ) . '">';
	cwp_ai_render_knowledge_tab( $ctx['qa_pairs'] );
	echo '</div>';
}

/**
 * Prints the plugin's admin page for the current section and pane.
 */
function cwp_ai_render_admin_page() {
	$section = cwp_ai_current_tab();
	$theme   = get_user_meta( get_current_user_id(), 'cwp_ai_admin_theme', true );
	$theme   = 'light' === $theme ? 'light' : 'dark';

	if ( 'home' === $section && apply_filters( 'cwp_ai_needs_setup', ! get_option( 'cwp_ai_setup_done' ) && ! cwp_ai_knowledge()->count() ) ) {
		$section = 'setup';
	}

	echo '<div class="wrap cwp-ai-admin" data-theme="' . esc_attr( $theme ) . '">';

	if ( 'setup' === $section ) {
		?>
		<div class="cwp-statusbar">
			<button type="button" class="cwp-theme-toggle" id="cwp-theme-toggle" aria-pressed="<?php echo esc_attr( 'dark' === $theme ? 'true' : 'false' ); ?>" title="Switch between light and dark">
				<span class="dashicons <?php echo esc_attr( 'dark' === $theme ? 'dashicons-visibility' : 'dashicons-hidden' ); ?>"></span>
				<span class="cwp-theme-label"><?php echo esc_html( 'dark' === $theme ? 'Light' : 'Dark' ); ?></span>
			</button>
		</div>
		<div class="tab-content">
			<?php call_user_func( apply_filters( 'cwp_ai_wizard_renderer', 'cwp_ai_render_wizard' ), null, cwp_ai_backend_url() ); ?>
		</div>
		<?php
		echo '</div>';
		return;
	}

	$pane   = cwp_ai_current_pane();
	$render = cwp_ai_sections()[ $section ]['panes'][ $pane ]['render'] ?? null;

	cwp_ai_render_shell( $section, $theme );

	echo '<div class="tab-content" data-pane="' . esc_attr( $section . '/' . $pane ) . '">';

	if ( is_callable( $render ) ) {
		call_user_func( $render );
	}

	echo '</div>';

	cwp_ai_render_shell_end();

	echo '</div>';
}