<?php
/**
 * Frontend functionality for Agentorie Chat.
 *
 * @package    Agentorie_Chat
 * @subpackage Agentorie_Chat/includes
 * @since      1.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Frontend class.
 *
 * @since 1.0.0
 */
class Agentorie_Frontend {

	/**
	 * Single instance.
	 *
	 * @var Agentorie_Frontend|null
	 */
	private static $instance = null;

	/**
	 * Get singleton instance.
	 *
	 * @since 1.0.0
	 * @return Agentorie_Frontend
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 *
	 * @since 1.0.0
	 */
	private function __construct() {
		$this->init_hooks();
	}

	/**
	 * Initialize hooks.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	private function init_hooks() {
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_styles' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
		add_action( 'wp_footer', array( $this, 'render_widget' ) );
	}

	/**
	 * Check if widget should be displayed.
	 *
	 * @since 1.0.0
	 * @return bool True if widget should display.
	 */
	public function should_display_widget() {
		if ( ! agentorie_chat_is_enabled() ) {
			return false;
		}

		// Admin Only mode - only show to logged-in administrators.
		if ( agentorie_chat_get_setting( 'admin_only', false ) && ! current_user_can( 'manage_options' ) ) {
			return false;
		}

		if ( is_admin() ) {
			return false;
		}

		// Hide on the WordPress login and registration screens (checked via $pagenow for 5.8 compatibility).
		if ( isset( $GLOBALS['pagenow'] ) && in_array( $GLOBALS['pagenow'], array( 'wp-login.php', 'wp-register.php' ), true ) ) {
			return false;
		}

		if ( is_customize_preview() ) {
			return false;
		}

		if ( wp_is_mobile() && agentorie_chat_get_setting( 'hide_on_mobile', false ) ) {
			return false;
		}

		if ( $this->is_excluded_page() ) {
			return false;
		}

		return apply_filters( 'agentorie_chat_display_widget', true );
	}

	/**
	 * Check if current page is excluded.
	 *
	 * @since 1.0.0
	 * @return bool True if page is excluded.
	 */
	private function is_excluded_page() {
		$excluded_pages = agentorie_chat_get_setting( 'exclude_pages', '' );

		if ( empty( $excluded_pages ) ) {
			return false;
		}

		$paths = array_map( 'trim', explode( ',', $excluded_pages ) );
		$paths = array_filter( $paths );

		if ( empty( $paths ) ) {
			return false;
		}

		$request_uri  = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
		$current_path = wp_parse_url( $request_uri, PHP_URL_PATH );

		foreach ( $paths as $path ) {
			if ( $current_path === $path ) {
				return true;
			}

			if ( '*' === substr( $path, -1 ) ) {
				$prefix = rtrim( $path, '*' );
				if ( 0 === strpos( $current_path, $prefix ) ) {
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Enqueue frontend styles.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function enqueue_styles() {
		if ( ! $this->should_display_widget() ) {
			return;
		}

		wp_enqueue_style(
			'agentorie-chat-widget',
			AGENTORIE_CHAT_PLUGIN_URL . 'assets/css/widget.css',
			array(),
			AGENTORIE_CHAT_VERSION
		);

		// Add CSP nonce for inline styles if available.
		$csp_nonce = apply_filters( 'agentorie_chat_csp_nonce', '' );
		if ( ! empty( $csp_nonce ) ) {
			wp_style_add_data( 'agentorie-chat-widget', 'nonce', $csp_nonce );
		}

		wp_add_inline_style( 'agentorie-chat-widget', $this->get_appearance_css() );
	}

	/**
	 * Get appearance CSS variables.
	 *
	 * @since 1.0.0
	 * @return string CSS custom properties.
	 */
	private function get_appearance_css() {
		$primary_color      = agentorie_chat_get_setting( 'primary_color', '#6366f1' );
		$primary_text_color = agentorie_chat_get_setting( 'primary_text_color', '#ffffff' );
		$user_bubble_color  = agentorie_chat_get_setting( 'user_bubble_color', '#6366f1' );
		$user_text_color    = agentorie_chat_get_setting( 'user_text_color', '#ffffff' );
		$bot_bubble_color   = agentorie_chat_get_setting( 'bot_bubble_color', '#f3f4f6' );
		$bot_text_color     = agentorie_chat_get_setting( 'bot_text_color', '#1f2937' );
		$background_color   = agentorie_chat_get_setting( 'background_color', '#ffffff' );

		$primary_dark = $this->darken_color( $primary_color, 15 );

		$button_sizes = array(
			'small'  => '50px',
			'medium' => '60px',
			'large'  => '70px',
		);
		$button_size  = agentorie_chat_get_setting( 'button_size', 'medium' );
		$button_px    = isset( $button_sizes[ $button_size ] ) ? $button_sizes[ $button_size ] : '60px';

		$chat_width    = agentorie_chat_get_setting( 'chat_width', '380' );
		$chat_height   = agentorie_chat_get_setting( 'chat_height', '550' );
		$border_radius = agentorie_chat_get_setting( 'border_radius', '16' );

		$shadows      = array(
			'none'   => 'none',
			'light'  => '0 4px 20px rgba(0, 0, 0, 0.08)',
			'medium' => '0 10px 40px rgba(0, 0, 0, 0.15)',
			'strong' => '0 20px 60px rgba(0, 0, 0, 0.25)',
		);
		$shadow_style = agentorie_chat_get_setting( 'shadow_style', 'medium' );
		$shadow       = isset( $shadows[ $shadow_style ] ) ? $shadows[ $shadow_style ] : $shadows['medium'];

		$button_margin_bottom = agentorie_chat_get_setting( 'button_margin_bottom', '20' );
		$welcome_font_weight  = agentorie_chat_get_setting( 'welcome_font_weight', '600' );

		$css = ':root {
			--agentorie-primary: ' . esc_attr( $primary_color ) . ';
			--agentorie-primary-dark: ' . esc_attr( $primary_dark ) . ';
			--agentorie-primary-text: ' . esc_attr( $primary_text_color ) . ';
			--agentorie-user-bubble: ' . esc_attr( $user_bubble_color ) . ';
			--agentorie-user-text: ' . esc_attr( $user_text_color ) . ';
			--agentorie-bot-bubble: ' . esc_attr( $bot_bubble_color ) . ';
			--agentorie-bot-text: ' . esc_attr( $bot_text_color ) . ';
			--agentorie-background: ' . esc_attr( $background_color ) . ';
			--agentorie-button-size: ' . esc_attr( $button_px ) . ';
			--agentorie-button-margin-bottom: ' . esc_attr( $button_margin_bottom ) . 'px;
			--agentorie-chat-width: ' . esc_attr( $chat_width ) . 'px;
			--agentorie-chat-height: ' . esc_attr( $chat_height ) . ( is_numeric( $chat_height ) ? 'px' : '' ) . ';
			--agentorie-border-radius: ' . esc_attr( $border_radius ) . 'px;
			--agentorie-shadow: ' . esc_attr( $shadow ) . ';
			--agentorie-welcome-weight: ' . esc_attr( $welcome_font_weight ) . ';
		}';

		return $css;
	}

	/**
	 * Darken a hex color by percentage.
	 *
	 * @since 1.0.0
	 * @param string $hex     Hex color code.
	 * @param int    $percent Percentage to darken.
	 * @return string Darkened hex color.
	 */
	private function darken_color( $hex, $percent ) {
		$hex = ltrim( $hex, '#' );

		if ( 6 !== strlen( $hex ) ) {
			return '#' . $hex;
		}

		$r = hexdec( substr( $hex, 0, 2 ) );
		$g = hexdec( substr( $hex, 2, 2 ) );
		$b = hexdec( substr( $hex, 4, 2 ) );

		$r = max( 0, (int) floor( $r * ( 1 - $percent / 100 ) ) );
		$g = max( 0, (int) floor( $g * ( 1 - $percent / 100 ) ) );
		$b = max( 0, (int) floor( $b * ( 1 - $percent / 100 ) ) );

		return sprintf( '#%02x%02x%02x', $r, $g, $b );
	}

	/**
	 * Enqueue frontend scripts.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function enqueue_scripts() {
		if ( ! $this->should_display_widget() ) {
			return;
		}

		wp_enqueue_script(
			'agentorie-chat-widget',
			AGENTORIE_CHAT_PLUGIN_URL . 'assets/js/widget.js',
			array(),
			AGENTORIE_CHAT_VERSION,
			array(
				'in_footer' => true,
				'strategy'  => 'defer',
			)
		);

		// Add CSP nonce if available (for sites with strict Content-Security-Policy).
		$csp_nonce = apply_filters( 'agentorie_chat_csp_nonce', '' );
		if ( ! empty( $csp_nonce ) ) {
			wp_script_add_data( 'agentorie-chat-widget', 'nonce', $csp_nonce );
		}

		wp_localize_script( 'agentorie-chat-widget', 'agentorieWidget', $this->get_widget_config() );

		// The real-time scripts (Socket.io and the WebSocket module) are not enqueued here:
		// widget.js loads them from the plugin folder only when they are needed, that is
		// when the visitor opens the chat or already has a conversation in progress.
	}

	/**
	 * Get widget configuration for JavaScript.
	 *
	 * @since 1.0.0
	 * @return array Widget configuration.
	 */
	private function get_widget_config() {
		// Voice features - based on user settings only.
		// SaaS handles authorization (subscription or demo).
		$stt_enabled = (bool) agentorie_chat_get_setting( 'speech_to_text', false );
		$tts_enabled = (bool) agentorie_chat_get_setting( 'text_to_speech', false );

		// Build authorized languages list (BCP-47 codes).
		$default_lang         = agentorie_chat_get_setting( 'default_language', 'en-US' );
		$authorized_languages = array( $default_lang );

		// Add languages from pack (active_languages) or legacy individual features (lang_XX-YY).
		$active_languages_setting = agentorie_chat_get_setting( 'active_languages', array() );
		if ( is_array( $active_languages_setting ) && ! empty( $active_languages_setting ) ) {
			foreach ( $active_languages_setting as $lang_code ) {
				if ( ! in_array( $lang_code, $authorized_languages, true ) ) {
					$authorized_languages[] = $lang_code;
				}
			}
		} else {
			$license_features = agentorie_chat_get_setting( 'license_features', array() );
			if ( is_array( $license_features ) ) {
				foreach ( $license_features as $feature ) {
					if ( 0 === strpos( $feature, 'lang_' ) && 0 !== strpos( $feature, 'lang_pack_' ) ) {
						$lang_code = substr( $feature, 5 );
						if ( ! in_array( $lang_code, $authorized_languages, true ) ) {
							$authorized_languages[] = $lang_code;
						}
					}
				}
			}
		}

		// Add demo language if active AND demos remaining.
		$demo_lang_active    = agentorie_chat_get_setting( 'demo_lang_active', '' );
		$demo_lang_remaining = (int) agentorie_chat_get_setting( 'demo_lang_remaining', 0 );
		if ( ! empty( $demo_lang_active ) && $demo_lang_remaining > 0 && ! in_array( $demo_lang_active, $authorized_languages, true ) ) {
			$authorized_languages[] = $demo_lang_active;
		}

		// Build labels and badges for authorized languages only.
		$all_languages   = Agentorie_Admin::get_supported_languages();
		$language_labels = array();
		$language_badges = array();

		foreach ( $authorized_languages as $code ) {
			$language_labels[ $code ] = isset( $all_languages[ $code ] ) ? $all_languages[ $code ] : $code;
			$parts                    = explode( '-', $code );
			$language_badges[ $code ] = strtoupper( end( $parts ) );
		}

		// WebSocket configuration.
		$websocket_enabled = agentorie_chat_get_setting( 'websocket_enabled', true );

		// Test mode: admin users get exclude_from_stats = true.
		$is_excluded_ip = Agentorie_API_Helpers::is_excluded_ip();

		// SaaS URL for translate endpoint.
		$saas_url = defined( 'AGENTORIE_CHAT_SAAS_URL' )
			? AGENTORIE_CHAT_SAAS_URL
			: 'https://app.agentorie.com';

		return array(
			'ajaxUrl'             => admin_url( 'admin-ajax.php' ),
			'restUrl'             => esc_url_raw( rest_url( 'agentorie-chat/v1/' ) ),
			'saasUrl'             => esc_url_raw( $saas_url ),
			'nonce'               => wp_create_nonce( 'agentorie_chat_public_nonce' ),
			'rateLimit'           => (int) agentorie_chat_get_setting( 'rate_limit', 10 ),
			'authorizedLanguages' => array_values( $authorized_languages ),
			'languageLabels'      => $language_labels,
			'languageBadges'      => $language_badges,
			'isExcludedIP'        => $is_excluded_ip,
			'config'              => array(
				'botName'                    => agentorie_chat_get_setting( 'bot_name', 'Stella' ),
				'botSubtitle'                => agentorie_chat_get_setting( 'bot_subtitle', __( 'Virtual Assistant', 'agentorie-chat' ) ),
				'botAvatar'                  => agentorie_chat_get_setting( 'bot_avatar', '' ),
				'adminName'                  => agentorie_chat_get_setting( 'livechat_advisor_name', __( 'Advisor', 'agentorie-chat' ) ),
				'adminAvatar'                => agentorie_chat_get_setting( 'livechat_advisor_avatar', '👤' ),
				'welcomeTitle'               => agentorie_chat_get_setting( 'welcome_title', __( 'Hello 👋', 'agentorie-chat' ) ),
				'welcomeMessage'             => agentorie_chat_get_setting( 'welcome_message', __( 'I am here to answer your questions.', 'agentorie-chat' ) ),
				'position'                   => agentorie_chat_get_setting( 'widget_position', 'bottom-right' ),
				'displayDelay'               => absint( agentorie_chat_get_setting( 'widget_delay_seconds', 0 ) ) * 1000,
				'conversationRetentionHours' => absint( agentorie_chat_get_setting( 'conversation_retention_hours', 6 ) ),
			),
			'appearance'          => array(
				'buttonIcon'       => agentorie_chat_get_setting( 'button_icon', '💬' ),
				'buttonStyle'      => agentorie_chat_get_setting( 'button_style', 'solid' ),
				'buttonEffect'     => agentorie_chat_get_setting( 'button_effect', 'none' ),
				'buttonAnimation'  => agentorie_chat_get_setting( 'button_animation', 'pulse' ),
				'headerStyle'      => agentorie_chat_get_setting( 'header_style', 'solid' ),
				'headerEffect'     => agentorie_chat_get_setting( 'header_effect', 'none' ),
				'showHeaderAvatar' => (bool) agentorie_chat_get_setting( 'show_header_avatar', true ),
				'showClientAvatar' => (bool) agentorie_chat_get_setting( 'show_client_avatar', false ),
				'clientAvatar'     => agentorie_chat_get_setting( 'client_avatar', '👤' ),
				'showLangSelector' => (bool) agentorie_chat_get_setting( 'show_lang_selector', true ),
			),
			'voice'               => array(
				'enabled'          => $stt_enabled || $tts_enabled,
				'sttEnabled'       => $stt_enabled,
				'ttsEnabled'       => $tts_enabled,
				'autoSend'         => true,
				'silenceDetection' => true,
				'silenceDuration'  => 1500,
				'defaultLanguage'  => agentorie_chat_get_setting( 'default_language', 'fr-FR' ),
			),
			'websocket'           => array(
				'enabled' => $websocket_enabled,
				'scripts' => $websocket_enabled ? array(
					add_query_arg( 'ver', '4.8.2', AGENTORIE_CHAT_PLUGIN_URL . 'assets/js/vendor/socket.io.min.js' ),
					add_query_arg( 'ver', AGENTORIE_CHAT_VERSION, AGENTORIE_CHAT_PLUGIN_URL . 'assets/js/widget-websocket.js' ),
				) : array(),
				'nonce'   => (string) apply_filters( 'agentorie_chat_csp_nonce', '' ),
			),
			'strings'             => $this->get_widget_strings(),
			'i18n'                => $this->get_i18n_strings(),
			'sourceTexts'         => array(
				'bot_subtitle'       => agentorie_chat_get_setting( 'bot_subtitle', __( 'Virtual Assistant', 'agentorie-chat' ) ),
				'availability_text'  => agentorie_chat_get_setting( 'availability_text', __( 'Available 24/7', 'agentorie-chat' ) ),
				'welcome_title'      => agentorie_chat_get_setting( 'welcome_title', __( 'Hello 👋', 'agentorie-chat' ) ),
				'welcome_message'    => agentorie_chat_get_setting( 'welcome_message', __( 'I am here to answer your questions.', 'agentorie-chat' ) ),
				'placeholder'        => agentorie_chat_get_setting( 'input_placeholder', __( 'Type your message...', 'agentorie-chat' ) ),
				'placeholder_voice'  => agentorie_chat_get_setting( 'voice_placeholder', __( 'Speak or write your message...', 'agentorie-chat' ) ),
				'reset_title'        => __( 'Reset conversation', 'agentorie-chat' ),
				'change_language'    => __( 'Change language', 'agentorie-chat' ),
				'record_voice_title' => __( 'Record voice message', 'agentorie-chat' ),
				'select_language'    => agentorie_chat_get_setting( 'lang_selector_title', __( 'Select your language', 'agentorie-chat' ) ),
			),
		);
	}

	/**
	 * Get widget-specific strings for JavaScript.
	 *
	 * @since 1.0.0
	 * @return array Strings for widget JS.
	 */
	private function get_widget_strings() {
		return array(
			'errorGeneric'       => __( 'Sorry, an error occurred. Please try again.', 'agentorie-chat' ),
			'errorConnection'    => __( 'Connection error. Please check your internet connection.', 'agentorie-chat' ),
			'rateLimitError'     => __( 'Too many messages. Please wait {seconds} seconds.', 'agentorie-chat' ),
			'reconnecting'       => __( 'Reconnecting...', 'agentorie-chat' ),
			/* translators: %1$s: admin display name, %2$s: bot/assistant name */
			'releaseNotice'      => __( '%1$s has handed you back to %2$s', 'agentorie-chat' ),
			'typeMessage'        => __( 'Type your message...', 'agentorie-chat' ),
			'takeControlFirst'   => __( 'Take control to send messages...', 'agentorie-chat' ),
			/* translators: %s: admin display name who took over the conversation */
			'takeoverNotice'     => __( '%s is now assisting you', 'agentorie-chat' ),
			'finishSetup'        => __( 'Finish Setup', 'agentorie-chat' ),
			'onboardingComplete' => __( 'Setup complete! Your chatbot is now ready for visitors.', 'agentorie-chat' ),
		);
	}

	/**
	 * Get i18n strings for JavaScript.
	 *
	 * @since 1.0.0
	 * @return array Internationalization strings.
	 */
	private function get_i18n_strings() {
		return array(
			'placeholder'       => __( 'Type your message...', 'agentorie-chat' ),
			'send'              => __( 'Send', 'agentorie-chat' ),
			'close'             => __( 'Close', 'agentorie-chat' ),
			'minimize'          => __( 'Minimize', 'agentorie-chat' ),
			'newConversation'   => __( 'New conversation', 'agentorie-chat' ),
			'advisorTakeover'   => __( 'An advisor is now assisting you', 'agentorie-chat' ),
			'connectionError'   => __( 'Connection error. Please try again.', 'agentorie-chat' ),
			'rateLimited'       => __( 'Please wait a moment before sending another message.', 'agentorie-chat' ),
			'rateLimitError'    => __( 'Too many messages. Please wait {seconds} seconds.', 'agentorie-chat' ),
			'limitReached'      => __( 'Message limit reached. Please try again later.', 'agentorie-chat' ),
			'conversationLimit' => __( 'This conversation has reached its message limit. Please start a new conversation.', 'agentorie-chat' ),
			'startRecording'    => __( 'Start recording', 'agentorie-chat' ),
			'stopRecording'     => __( 'Stop recording', 'agentorie-chat' ),
			'listening'         => __( 'Listening...', 'agentorie-chat' ),
			'processing'        => __( 'Processing...', 'agentorie-chat' ),
			'listenMessage'     => __( 'Listen to message', 'agentorie-chat' ),
			'justNow'           => __( 'Just now', 'agentorie-chat' ),
			'selectLanguage'    => __( 'Select your language', 'agentorie-chat' ),
			/* translators: %d: number of minutes ago */
			'minutesAgo'        => __( '%d min ago', 'agentorie-chat' ),
			'contactForm'       => array(
				'title'   => __( 'Contact Us', 'agentorie-chat' ),
				'name'    => __( 'Your name', 'agentorie-chat' ),
				'email'   => __( 'Your email', 'agentorie-chat' ),
				'phone'   => __( 'Your phone (optional)', 'agentorie-chat' ),
				'message' => __( 'Your message', 'agentorie-chat' ),
				'submit'  => __( 'Send', 'agentorie-chat' ),
				'success' => __( 'Thank you! We will contact you soon.', 'agentorie-chat' ),
				'error'   => __( 'An error occurred. Please try again.', 'agentorie-chat' ),
			),
		);
	}

	/**
	 * Render the chat widget.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function render_widget() {
		if ( ! $this->should_display_widget() ) {
			return;
		}

		$bot_name      = agentorie_chat_get_setting( 'bot_name', 'Stella' );
		$bot_subtitle  = agentorie_chat_get_setting( 'bot_subtitle', __( 'Virtual Assistant', 'agentorie-chat' ) );
		$bot_avatar    = agentorie_chat_get_setting( 'bot_avatar', '' );
		$position      = agentorie_chat_get_setting( 'widget_position', 'bottom-right' );
		$primary_color = agentorie_chat_get_setting( 'widget_primary_color', '#6366f1' );
		$text_color    = agentorie_chat_get_setting( 'widget_text_color', '#ffffff' );
		$stt_enabled   = (bool) agentorie_chat_get_setting( 'speech_to_text', false );
		$tts_enabled   = (bool) agentorie_chat_get_setting( 'text_to_speech', false );

		$template = locate_template( 'agentorie-chat/widget.php' );

		try {
			if ( $template ) {
				include $template;
			} else {
				include AGENTORIE_CHAT_PLUGIN_DIR . 'assets/template-widget.php';
			}
		} catch ( Exception $e ) {
			Agentorie_Logger::error(
				'Widget render failed',
				array(
					'error'    => $e->getMessage(),
					'template' => $template ? $template : 'default',
				)
			);
		}
	}
}