<?php
/**
 * HSSM Notifications Class
 * 
 * Handles all email notifications for the slide manager
 * 
 * @package Hi_School_Slide_Manager
 * @since 1.0.0
 */

// Prevent direct access
if ( ! defined( 'ABSPATH' ) ) {
    exit( 'Direct access forbidden.' );
}

/**
 * HSSM Notifications Class
 */
class HSSM_Notifications {
    
    /**
     * Constructor
     * 
     * @since 1.0.0
     */
    public function __construct() {
        // We'll hook into actions that trigger notifications
    }

    /**
     * Get notification settings
     * 
     * @return array Array of email addresses for different roles
     */
    public static function get_settings() {
        $defaults = array(
            'editor_emails' => '',
            'itc_emails' => ''
        );
        
        $settings = get_option( 'hssm_notification_settings', $defaults );
        
        // Ensure we have an array and it contains our expected keys
        if ( ! is_array( $settings ) ) {
            return $defaults;
        }
        
        return wp_parse_args( $settings, $defaults );
    }

    /**
     * Save notification settings
     * 
     * @param array $settings Array of settings
     * @return bool True if saved successfully
     */
    public static function save_settings( $settings ) {
        $clean_settings = array(
            'editor_emails' => sanitize_textarea_field( $settings['editor_emails'] ),
            'itc_emails' => sanitize_textarea_field( $settings['itc_emails'] )
        );
        
        return update_option( 'hssm_notification_settings', $clean_settings );
    }

    /**
     * Helper to get emails as array from string
     * 
     * @param string $emails_string Comma or newline separated emails
     * @return array Array of valid email addresses
     */
    private function get_emails_array( $emails_string ) {
        if ( empty( $emails_string ) ) {
            return array();
        }

        // Replace newlines with commas
        $emails_string = str_replace( array( "\r", "\n" ), ',', $emails_string );
        $emails = explode( ',', $emails_string );
        
        $clean_emails = array();
        foreach ( $emails as $email ) {
            $email = sanitize_email( trim( $email ) );
            if ( is_email( $email ) ) {
                $clean_emails[] = $email;
            }
        }
        
        return array_unique( $clean_emails );
    }

    /**
     * Send notification to Editor when slide is Scheduled or Published Immediately
     * 
     * @param int $slide_id Slide ID
     * @param string $status 'scheduled' or 'published'
     */
    public function notify_editor_slide_created( $slide_id, $status ) {
        $settings = self::get_settings();
        $emails = $this->get_emails_array( $settings['editor_emails'] );
        
        if ( empty( $emails ) ) {
            error_log( 'HSSM: No Editor emails configured for notification.' );
            return;
        }

        $slide = get_post( $slide_id );
        if ( ! $slide ) return;

        $target_sites = wp_get_post_terms( $slide_id, 'hssm_site', array( 'fields' => 'slugs' ) );
        $site_slugs = ! empty( $target_sites ) ? implode( ',', $target_sites ) : '';
        
        // Determine publish date
        $publish_date = ( $status === 'scheduled' ) 
            ? get_post_meta( $slide_id, '_hssm_start_date', true ) 
            : current_time( 'Y-m-d' );

        // Construct preview link
        // page-slide-preview.php logic usually takes 'date' and 'site' params
        // We'll link to the preview page. Assuming there is a page with the template, or we use a custom URL structure if defined.
        // The instructions mentioned: "generated link to the slide-preview page with params containing the slide-title, the publish-date... and the site slugs"
        
        $preview_page_url = home_url( '/slide-preview/' ); // Basic assumption, adjust if needed based on setup
        // Better: find the page using the template
        $pages = get_pages(array(
            'meta_key' => '_wp_page_template',
            'meta_value' => 'page-slide-preview.php'
        ));
        
        if ( ! empty( $pages ) ) {
            $preview_page_url = get_permalink( $pages[0]->ID );
        }

        $preview_link = add_query_arg( array(
            'preview_title' => urlencode( $slide->post_title ),
            'date' => $publish_date,
            'sites' => $site_slugs,
            'preview_mode' => 'editor_check' 
        ), $preview_page_url );

        $subject = sprintf( 'New Slide %s: "%s"', ucfirst( $status ), $slide->post_title );
        
        $message = "A new slide has been " . ( $status === 'scheduled' ? 'Scheduled' : 'Published Immediately' ) . ".\n\n";
        $message .= "Title: " . $slide->post_title . "\n";
        $message .= "Target Date: " . $publish_date . "\n";
        $message .= "Target Sites: " . implode( ', ', $target_sites ) . "\n\n";
        $message .= "Preview Link: " . $preview_link . "\n\n";
        $message .= "Please review the slide.";

        foreach ( $emails as $email ) {
            wp_mail( $email, $subject, $message );
        }
    }

    /**
     * Send notification to Creator (Author) when slide is Approved
     * 
     * @param int $slide_id Slide ID
     */
    public function notify_creator_slide_approved( $slide_id ) {
        $slide = get_post( $slide_id );
        if ( ! $slide ) return;

        $author_email = get_the_author_meta( 'user_email', $slide->post_author );
        
        if ( ! is_email( $author_email ) ) return;

        $subject = 'Your Slide Has Been Approved: "' . $slide->post_title . '"';
        
        $message = "Good news! Your slide has been approved.\n\n";
        $message .= "Title: " . $slide->post_title . "\n";
        $message .= "It is now scheduled/published according to your settings.";

        wp_mail( $author_email, $subject, $message );
    }

    /**
     * Send notification to ITCGuys when slide goes LIVE
     * 
     * @param int $slide_id Slide ID
     */
    public function notify_itc_slide_live( $slide_id ) {
        $settings = self::get_settings();
        $emails = $this->get_emails_array( $settings['itc_emails'] );
        
        if ( empty( $emails ) ) return;

        $slide = get_post( $slide_id );
        if ( ! $slide ) return;

        // Generate Confirmation Link
        // This link needs to trigger the "Slide is Live" confirmation page
        // We probably need a specialized page or endpoint for this.
        // Let's assume we use the Dashboard page with a specific action param or a separate page.
        // User requested: "We need a page 'Slide is Live' ... with a green confirmation button"
        // Let's use the preview page or dashboard page with a specific query arg to show this UI.
        // Or better, a dedicated endpoint. For now, let's point to the dashboard with a "confirm_live" param.
        
        $confirm_url = home_url( '/slide-live-confirmation/' ); // Ideally we create this page or rewrite rule
        // For now, let's use the dashboard url with arguments, and we'll handle the UI there or create a rewrite.
        // Actually, creating a specific page 'Slide is Live' was requested. 
        // I'll create a new template `page-slide-confirmation.php` later.
        
        // Find confirmation page if exists, or construct URL
        $pages = get_pages(array(
            'meta_key' => '_wp_page_template',
            'meta_value' => 'page-slide-confirmation.php'
        ));
        $confirmation_page_url = !empty($pages) ? get_permalink($pages[0]->ID) : home_url('/?hssm_action=confirm_live');

        $confirm_link = add_query_arg( array(
            'slide_id' => $slide_id,
            'token' => wp_create_nonce( 'hssm_confirm_live_' . $slide_id ) // Note: Nonces depend on user session, might be tricky for email links if user isn't logged in. 
            // Better to use a hash that doesn't expire or relies on a shared secret if ITC guys are not logged in.
            // Assuming ITC guys are logged in users for now or we just use a hash.
        ), $confirmation_page_url );
        
        // Since email links are clicked outside sessions often, maybe just a hash of slide ID + secret salt.
        $token = hash( 'sha256', $slide_id . 'hssm_secret_salt' );
        $confirm_link = add_query_arg( array(
            'slide_id' => $slide_id,
            'hssm_token' => $token
        ), $confirmation_page_url );


        $target_sites = wp_get_post_terms( $slide_id, 'hssm_site', array( 'fields' => 'slugs' ) );
        
        $subject = 'ACTION REQUIRED: Slide is LIVE - "' . $slide->post_title . '"';
        
        $message = "A slide has just gone LIVE.\n\n";
        $message .= "Title: " . $slide->post_title . "\n";
        $message .= "Sites: " . implode( ', ', $target_sites ) . "\n\n";
        $message .= "Please check the sites to ensure it is displaying correctly.\n";
        $message .= "Once verified, click the link below to confirm to the Editor and Author:\n\n";
        $message .= $confirm_link;

        foreach ( $emails as $email ) {
            wp_mail( $email, $subject, $message );
        }
    }

    /**
     * Send FINAL notification to Editor and Author (triggered by ITC confirmation)
     * 
     * @param int $slide_id Slide ID
     */
    public function notify_all_confirmed_live( $slide_id ) {
        $slide = get_post( $slide_id );
        if ( ! $slide ) return;

        // Editor Emails
        $settings = self::get_settings();
        $editor_emails = $this->get_emails_array( $settings['editor_emails'] );
        
        // Author Email
        $author_email = get_the_author_meta( 'user_email', $slide->post_author );
        
        $recipients = array_merge( $editor_emails, array( $author_email ) );
        $recipients = array_unique( array_filter( $recipients ) );

        if ( empty( $recipients ) ) return;

        $subject = 'CONFIRMED: Slide is Live and Verified - "' . $slide->post_title . '"';
        
        $message = "The slide has been verified as LIVE by the ITC team.\n\n";
        $message .= "Title: " . $slide->post_title . "\n";
        $message .= "Status: Live & Verified\n\n";
        $message .= "You can view the slide on the live sites.";

        foreach ( $recipients as $email ) {
            wp_mail( $email, $subject, $message );
        }
    }
}