<?php
/**
 * Settings: defaults, loading and sanitizing.
 *
 * @package AviSupportAssistant
 */

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

/**
 * Default plugin settings.
 *
 * @return array
 */
function avca_get_defaults() {
	return array(
		// General.
		'enabled'         => 1,
		'bot_name'        => __( 'Support Assistant', 'avi-support-assistant' ),
		'subtitle'        => __( 'We are here to help', 'avi-support-assistant' ),
		'tooltip'         => __( 'Chat with us', 'avi-support-assistant' ),

		// Appearance.
		'launcher'        => 'robot',
		'bot_icon'        => '',
		'color'           => '#0b63ce',
		'theme'           => 'light',
		'position'        => 'left',

		// Conversation.
		'welcome'         => __( 'Hi there! 👋 Ask me a question or pick one below.', 'avi-support-assistant' ),
		'fallback'        => __( "Sorry, I don't have an answer for that yet. Please try asking in a different way, or pick one of the questions below.", 'avi-support-assistant' ),
		'max_suggestions' => 0,
		'quick_links'     => '',
		'faqs'            => array(
			array(
				'question' => __( 'What are your business hours?', 'avi-support-assistant' ),
				'keywords' => __( 'hours, timing, open, close, working time', 'avi-support-assistant' ),
				'answer'   => __( 'We are open Monday to Saturday, 9:30 AM to 6:30 PM.', 'avi-support-assistant' ),
			),
			array(
				'question' => __( 'Where are you located?', 'avi-support-assistant' ),
				'keywords' => __( 'address, location, office, where', 'avi-support-assistant' ),
				'answer'   => __( 'Please update this answer with your office address.', 'avi-support-assistant' ),
			),
			array(
				'question' => __( 'How can I get a quote?', 'avi-support-assistant' ),
				'keywords' => __( 'quote, price, pricing, cost, rate, charges', 'avi-support-assistant' ),
				'answer'   => __( 'Share your requirements through our contact page and we will send a quote within one working day.', 'avi-support-assistant' ),
			),
		),

		// Search & leads.
		'site_search'     => 1,
		'search_types'    => array( 'post', 'page' ),
		'lead_form'       => 1,
		'lead_phone'      => 1,
		'lead_prompt'     => __( "Couldn't find what you need? Leave your details and our team will get back to you.", 'avi-support-assistant' ),
		'lead_button'     => __( 'Leave my details', 'avi-support-assistant' ),
		'lead_thanks'     => __( 'Thank you! Our team will get back to you soon.', 'avi-support-assistant' ),
		'lead_email'      => '',
		'log_unanswered'  => 1,

		// Contact options.
		'call_number'     => '',
		'call_label'      => __( 'Call us', 'avi-support-assistant' ),
		'callback'        => 0,
		'callback_label'  => __( 'Request a callback', 'avi-support-assistant' ),
		'whatsapp_number' => '',
		'whatsapp_label'  => __( 'Chat on WhatsApp', 'avi-support-assistant' ),
		'whatsapp_text'   => __( 'Hello! I have a question.', 'avi-support-assistant' ),
		'contact_show'    => 'always',

		// Display rules.
		'auto_open'       => 0,
		'devices'         => 'all',
		'exclude_pages'   => '',
		'delete_data'     => 0,
	);
}

/**
 * Get plugin settings merged with defaults.
 *
 * @return array
 */
function avca_get_settings() {
	$saved    = get_option( AVCA_OPTION, array() );
	$settings = wp_parse_args( is_array( $saved ) ? $saved : array(), avca_get_defaults() );

	return array_intersect_key( $settings, avca_get_defaults() );
}

/**
 * Get one setting.
 *
 * @param string $key Setting key.
 * @return mixed
 */
function avca_get_setting( $key ) {
	$settings = avca_get_settings();
	return isset( $settings[ $key ] ) ? $settings[ $key ] : null;
}

/**
 * Allowed values for choice settings.
 *
 * @return array
 */
function avca_get_choices() {
	return array(
		'launcher'     => array(
			'robot'  => __( 'Robot mascot', 'avi-support-assistant' ),
			'bubble' => __( 'Round chat bubble', 'avi-support-assistant' ),
			'pill'   => __( 'Button with label', 'avi-support-assistant' ),
		),
		'theme'        => array(
			'light' => __( 'Light', 'avi-support-assistant' ),
			'dark'  => __( 'Dark', 'avi-support-assistant' ),
		),
		'position'     => array(
			'left'  => __( 'Bottom left', 'avi-support-assistant' ),
			'right' => __( 'Bottom right', 'avi-support-assistant' ),
		),
		'contact_show' => array(
			'always'    => __( 'Always, with the suggested questions', 'avi-support-assistant' ),
			'no_answer' => __( 'Only when the bot has no answer', 'avi-support-assistant' ),
		),
		'devices'      => array(
			'all'     => __( 'All devices', 'avi-support-assistant' ),
			'desktop' => __( 'Desktop and tablet only', 'avi-support-assistant' ),
			'mobile'  => __( 'Mobile only', 'avi-support-assistant' ),
		),
	);
}

/**
 * Public post types that site search can use.
 *
 * @return array Post type name => label.
 */
function avca_get_searchable_post_types() {
	$types = array();

	foreach ( get_post_types( array( 'public' => true ), 'objects' ) as $type ) {
		if ( 'attachment' === $type->name ) {
			continue;
		}
		$types[ $type->name ] = $type->labels->name;
	}

	return $types;
}

/**
 * Sanitize settings input.
 *
 * @param array $input Raw input.
 * @return array Sanitized settings.
 */
function avca_sanitize_settings( $input ) {
	$input     = is_array( $input ) ? $input : array();
	$defaults  = avca_get_defaults();
	$sanitized = array();

	foreach ( array( 'enabled', 'site_search', 'lead_form', 'lead_phone', 'log_unanswered', 'delete_data', 'callback' ) as $key ) {
		$sanitized[ $key ] = empty( $input[ $key ] ) ? 0 : 1;
	}

	foreach ( avca_get_choices() as $key => $choices ) {
		$value             = isset( $input[ $key ] ) ? sanitize_key( $input[ $key ] ) : '';
		$sanitized[ $key ] = isset( $choices[ $value ] ) ? $value : $defaults[ $key ];
	}

	foreach ( array( 'bot_name', 'subtitle', 'tooltip', 'lead_button', 'call_label', 'callback_label', 'whatsapp_label' ) as $key ) {
		$sanitized[ $key ] = isset( $input[ $key ] ) ? sanitize_text_field( $input[ $key ] ) : '';
	}

	foreach ( array( 'welcome', 'fallback', 'lead_prompt', 'lead_thanks', 'whatsapp_text' ) as $key ) {
		$sanitized[ $key ] = isset( $input[ $key ] ) ? sanitize_textarea_field( $input[ $key ] ) : '';
	}

	// Phone numbers: digits and a leading + only.
	$sanitized['call_number']     = isset( $input['call_number'] ) ? avca_sanitize_phone( $input['call_number'], true ) : '';
	$sanitized['whatsapp_number'] = isset( $input['whatsapp_number'] ) ? avca_sanitize_phone( $input['whatsapp_number'], false ) : '';

	if ( '' !== $sanitized['whatsapp_number'] && ( strlen( $sanitized['whatsapp_number'] ) < 8 || strlen( $sanitized['whatsapp_number'] ) > 15 ) ) {
		add_settings_error( AVCA_OPTION, 'avca_invalid_whatsapp', __( 'Please enter the WhatsApp number with country code, digits only (for example 919876543210).', 'avi-support-assistant' ) );
	}

	$color              = isset( $input['color'] ) ? sanitize_hex_color( $input['color'] ) : '';
	$sanitized['color'] = $color ? $color : $defaults['color'];

	$sanitized['bot_icon'] = isset( $input['bot_icon'] ) ? esc_url_raw( $input['bot_icon'] ) : '';

	$sanitized['max_suggestions'] = isset( $input['max_suggestions'] ) ? min( 50, absint( $input['max_suggestions'] ) ) : 0;
	$sanitized['auto_open']       = isset( $input['auto_open'] ) ? min( 600, absint( $input['auto_open'] ) ) : 0;

	$email                   = isset( $input['lead_email'] ) ? sanitize_email( $input['lead_email'] ) : '';
	$sanitized['lead_email'] = is_email( $email ) ? $email : '';

	if ( isset( $input['lead_email'] ) && '' !== trim( (string) $input['lead_email'] ) && '' === $sanitized['lead_email'] ) {
		add_settings_error( AVCA_OPTION, 'avca_invalid_email', __( 'The lead notification email address is not valid, so leads will be sent to the site admin email.', 'avi-support-assistant' ) );
	}

	$allowed_types             = array_keys( avca_get_searchable_post_types() );
	$types                     = isset( $input['search_types'] ) && is_array( $input['search_types'] ) ? array_map( 'sanitize_key', $input['search_types'] ) : array();
	$sanitized['search_types'] = array_values( array_intersect( $types, $allowed_types ) );

	// Page IDs, comma separated.
	$ids                        = isset( $input['exclude_pages'] ) ? wp_parse_id_list( $input['exclude_pages'] ) : array();
	$sanitized['exclude_pages'] = implode( ', ', array_filter( $ids ) );

	$sanitized['quick_links'] = isset( $input['quick_links'] ) ? avca_sanitize_quick_links( $input['quick_links'] ) : '';

	$sanitized['faqs'] = array();
	$is_pro            = function_exists( 'avca_pro_active' ) && avca_pro_active();
	$max_allowed       = $is_pro ? AVCA_MAX_FAQS : 3;

	if ( ! empty( $input['faqs'] ) && is_array( $input['faqs'] ) ) {
		foreach ( $input['faqs'] as $faq ) {
			if ( ! is_array( $faq ) ) {
				continue;
			}

			$question = isset( $faq['question'] ) ? sanitize_text_field( $faq['question'] ) : '';
			$answer   = isset( $faq['answer'] ) ? sanitize_textarea_field( $faq['answer'] ) : '';

			// Skip incomplete rows.
			if ( '' === $question || '' === $answer ) {
				continue;
			}

			$sanitized['faqs'][] = array(
				'question' => $question,
				'keywords' => isset( $faq['keywords'] ) ? sanitize_text_field( $faq['keywords'] ) : '',
				'answer'   => $answer,
			);

			if ( count( $sanitized['faqs'] ) >= $max_allowed ) {
				if ( ! $is_pro && count( $input['faqs'] ) > 3 ) {
					add_settings_error(
						AVCA_OPTION,
						'avca_faq_limit',
						__( 'Free Plan Limit: Saved the first 3 FAQs. Upgrade to Pro for unlimited FAQs and AI answers.', 'avi-support-assistant' ),
						'info'
					);
				}
				break;
			}
		}
	}

	return $sanitized;
}

/**
 * Sanitize a phone number.
 *
 * @param string $raw        Raw number.
 * @param bool   $allow_plus Keep a leading +.
 * @return string
 */
function avca_sanitize_phone( $raw, $allow_plus ) {
	$raw    = trim( (string) $raw );
	$plus   = $allow_plus && 0 === strpos( $raw, '+' ) ? '+' : '';
	$digits = preg_replace( '/\D+/', '', $raw );

	return '' === $digits ? '' : $plus . $digits;
}

/**
 * Sanitize the quick links textarea: one "Label | URL" per line.
 *
 * @param string $raw Raw textarea value.
 * @return string
 */
function avca_sanitize_quick_links( $raw ) {
	$lines = array();

	foreach ( avca_parse_quick_links( (string) $raw ) as $link ) {
		$lines[] = $link['label'] . ' | ' . $link['url'];
	}

	return implode( "\n", $lines );
}

/**
 * Parse quick links text into label/URL pairs.
 *
 * @param string $raw "Label | URL" per line.
 * @return array[] Each item has label and url.
 */
function avca_parse_quick_links( $raw ) {
	$links = array();

	foreach ( preg_split( '/\r\n|\r|\n/', (string) $raw ) as $line ) {
		$parts = array_map( 'trim', explode( '|', $line, 2 ) );

		if ( 2 !== count( $parts ) ) {
			continue;
		}

		$label = sanitize_text_field( $parts[0] );
		$url   = esc_url_raw( $parts[1] );

		if ( '' === $label || '' === $url ) {
			continue;
		}

		$links[] = array(
			'label' => $label,
			'url'   => $url,
		);

		if ( count( $links ) >= 10 ) {
			break;
		}
	}

	return $links;
}

/**
 * Set default options on activation.
 */
function avca_activate() {
	if ( false === get_option( AVCA_OPTION ) ) {
		add_option( AVCA_OPTION, avca_get_defaults() );
	}

	if ( false === get_option( AVCA_UNANSWERED_OPTION ) ) {
		add_option( AVCA_UNANSWERED_OPTION, array(), '', false );
	}
}