<?php
/**
 * Email notification system for job submissions
 *
 * @package DDHH_Job_Manager
 */

// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

/**
 * Handles email notifications for job submissions
 */
class DDHH_JM_Notifications {

	/**
	 * Setup notification hooks
	 */
	public static function setup_hooks() {
		// Hook into job submission to send admin notification (after metadata is saved)
		add_action( 'ddhh_job_submitted', array( __CLASS__, 'send_admin_new_job_notification_after_submit' ), 10, 2 );

		// Hook into job edit to send admin notification (after metadata is saved)
		add_action( 'ddhh_job_edited', array( __CLASS__, 'send_admin_job_edit_notification_after_submit' ), 10, 2 );

		// Hook into post status transitions to detect job deactivations
		add_action( 'transition_post_status', array( __CLASS__, 'send_admin_job_deactivation_notification' ), 10, 3 );

		// Hook into post status transitions to notify mentors on job publish
		add_action( 'transition_post_status', array( __CLASS__, 'notify_mentors_on_job_publish' ), 10, 3 );

		// Hook into Formidable form submissions to send application notifications
		add_action( 'frm_after_create_entry', array( __CLASS__, 'send_provider_application_notification' ), 30, 2 );
	}

	/**
	 * Send admin notification when a new job is submitted (called after metadata is saved)
	 *
	 * @param int $post_id  Post ID.
	 * @param int $entry_id Entry ID.
	 */
	public static function send_admin_new_job_notification_after_submit( $post_id, $entry_id ) {
		$post = get_post( $post_id );
		if ( ! $post || 'job_offer' !== $post->post_type ) {
			return;
		}

		// Get admin email
		$admin_email = get_option( 'admin_email' );
		if ( ! $admin_email ) {
			error_log( 'DDHH Job Manager: Cannot send admin notification - admin_email option not set' );
			return;
		}

		// Prepare email data
		$job_title = $post->post_title;
		$author    = get_userdata( $post->post_author );
		$author_name = $author ? $author->display_name : 'Unbekannt';
		$author_org  = get_user_meta( $post->post_author, 'ddhh_org_name', true );
		if ( empty( $author_org ) ) {
			$author_org = 'Nicht angegeben';
		}

		// Get post meta fields
		$job_location = get_post_meta( $post->ID, 'job_location', true );
		$job_type     = get_post_meta( $post->ID, 'job_type', true );

		// Get submission date
		$submission_date = get_the_date( 'd.m.Y H:i', $post->ID );

		// Get edit link
		$edit_link = get_edit_post_link( $post->ID, '' );

		// Build email subject
		$subject = sprintf( 'Neues Stellenangebot zur Prüfung: %s', $job_title );

		// Build email body
		$body = sprintf(
			"Ein neues Stellenangebot wurde eingereicht und wartet auf Ihre Prüfung.\n\n" .
			"Titel: %s\n" .
			"Anbieter: %s (%s)\n" .
			"Standort: %s\n" .
			"Art: %s\n" .
			"Eingereicht am: %s\n\n" .
			"Prüfen Sie das Stellenangebot hier:\n%s\n\n" .
			"---\n" .
			"Diese E-Mail wurde automatisch gesendet.",
			$job_title,
			$author_name,
			$author_org,
			$job_location ? $job_location : 'Nicht angegeben',
			$job_type ? $job_type : 'Nicht angegeben',
			$submission_date,
			$edit_link
		);

		// Set email headers
		$headers = array( 'Content-Type: text/html; charset=UTF-8' );

		// Convert plain text to HTML with line breaks
		$html_body = nl2br( esc_html( $body ) );

		// Send email
		$sent = wp_mail( $admin_email, $subject, $html_body, $headers );

		// Log if email fails
		if ( ! $sent ) {
			error_log(
				sprintf(
					'DDHH Job Manager: Failed to send admin notification for job #%d "%s". Email may be disabled in Local WP environment.',
					$post->ID,
					$job_title
				)
			);
		}
	}

	/**
	 * Send admin notification when a job is edited (called after metadata is saved)
	 *
	 * @param int $post_id  Post ID.
	 * @param int $entry_id Entry ID.
	 */
	public static function send_admin_job_edit_notification_after_submit( $post_id, $entry_id ) {
		$post = get_post( $post_id );
		if ( ! $post || 'job_offer' !== $post->post_type ) {
			return;
		}

		// Get admin email
		$admin_email = get_option( 'admin_email' );
		if ( ! $admin_email ) {
			error_log( 'DDHH Job Manager: Cannot send admin notification - admin_email option not set' );
			return;
		}

		// Prepare email data
		$job_title = $post->post_title;
		$author    = get_userdata( $post->post_author );
		$author_name = $author ? $author->display_name : 'Unbekannt';
		$author_org  = get_user_meta( $post->post_author, 'ddhh_org_name', true );
		if ( empty( $author_org ) ) {
			$author_org = 'Nicht angegeben';
		}

		// Get post meta fields
		$job_location = get_post_meta( $post->ID, 'job_location', true );
		$job_type     = get_post_meta( $post->ID, 'job_type', true );

		// Get submission date
		$submission_date = current_time( 'd.m.Y H:i' );

		// Get edit link
		$edit_link = get_edit_post_link( $post->ID, '' );

		// Build email subject
		$subject = sprintf( 'Stellenangebot bearbeitet und wartet auf Prüfung: %s', $job_title );

		// Build email body
		$body = sprintf(
			"Ein Stellenangebot wurde bearbeitet und wartet auf erneute Prüfung.\n\n" .
			"Titel: %s\n" .
			"Anbieter: %s (%s)\n" .
			"Standort: %s\n" .
			"Art: %s\n" .
			"Bearbeitet am: %s\n\n" .
			"Prüfen Sie das Stellenangebot hier:\n%s\n\n" .
			"---\n" .
			"Diese E-Mail wurde automatisch gesendet.",
			$job_title,
			$author_name,
			$author_org,
			$job_location ? $job_location : 'Nicht angegeben',
			$job_type ? $job_type : 'Nicht angegeben',
			$submission_date,
			$edit_link
		);

		// Set email headers
		$headers = array( 'Content-Type: text/html; charset=UTF-8' );

		// Convert plain text to HTML with line breaks
		$html_body = nl2br( esc_html( $body ) );

		// Send email
		$sent = wp_mail( $admin_email, $subject, $html_body, $headers );

		// Log if email fails
		if ( ! $sent ) {
			error_log(
				sprintf(
					'DDHH Job Manager: Failed to send admin edit notification for job #%d "%s". Email may be disabled in Local WP environment.',
					$post->ID,
					$job_title
				)
			);
		}
	}

	/**
	 * Send admin notification when a job is deactivated by provider
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	public static function send_admin_job_deactivation_notification( $new_status, $old_status, $post ) {
		// Only trigger on job_offer posts transitioning from publish to draft
		if ( 'job_offer' !== $post->post_type ) {
			return;
		}

		// Only send notification when published job becomes draft (deactivation)
		// Avoid notification on draft saves or initial draft creation
		if ( 'draft' !== $new_status || 'publish' !== $old_status ) {
			return;
		}

		// Get admin email
		$admin_email = get_option( 'admin_email' );
		if ( ! $admin_email ) {
			error_log( 'DDHH Job Manager: Cannot send deactivation notification - admin_email option not set' );
			return;
		}

		// Prepare email data
		$job_title = $post->post_title;
		$author    = get_userdata( $post->post_author );
		$author_name = $author ? $author->display_name : 'Unbekannt';
		$author_org  = get_user_meta( $post->post_author, 'ddhh_org_name', true );
		if ( empty( $author_org ) ) {
			$author_org = 'Nicht angegeben';
		}

		// Get post meta fields
		$job_location = get_post_meta( $post->ID, 'job_location', true );
		$job_type     = get_post_meta( $post->ID, 'job_type', true );

		// Get deactivation reason from post meta
		$deactivation_reason = get_post_meta( $post->ID, 'job_deactivation_reason', true );
		if ( empty( $deactivation_reason ) ) {
			$deactivation_reason = 'Kein Grund angegeben';
		}

		// Get deactivation date
		$deactivation_date = current_time( 'd.m.Y H:i' );

		// Get edit link
		$edit_link = get_edit_post_link( $post->ID, '' );

		// Build email subject
		$subject = sprintf( 'Stellenangebot deaktiviert: %s', $job_title );

		// Build email body
		$body = sprintf(
			"Ein Stellenangebot wurde vom Anbieter deaktiviert.\n\n" .
			"Titel: %s\n" .
			"Anbieter: %s (%s)\n" .
			"Standort: %s\n" .
			"Art: %s\n" .
			"Deaktiviert am: %s\n\n" .
			"Grund für Deaktivierung:\n%s\n\n" .
			"Stelle ansehen:\n%s\n\n" .
			"---\n" .
			"Diese E-Mail wurde automatisch gesendet.",
			$job_title,
			$author_name,
			$author_org,
			$job_location ? $job_location : 'Nicht angegeben',
			$job_type ? $job_type : 'Nicht angegeben',
			$deactivation_date,
			$deactivation_reason ? $deactivation_reason : 'Nicht angegeben',
			$edit_link
		);

		// Set email headers
		$headers = array( 'Content-Type: text/html; charset=UTF-8' );

		// Convert plain text to HTML with line breaks
		$html_body = nl2br( esc_html( $body ) );

		// Send email
		$sent = wp_mail( $admin_email, $subject, $html_body, $headers );

		// Log if email fails
		if ( ! $sent ) {
			error_log(
				sprintf(
					'DDHH Job Manager: Failed to send admin deactivation notification for job #%d "%s". Email may be disabled in Local WP environment.',
					$post->ID,
					$job_title
				)
			);
		}
	}

	/**
	 * Send provider notification when a mentor applies to their job
	 *
	 * @param int $entry_id Entry ID.
	 * @param int $form_id  Form ID.
	 */
	public static function send_provider_application_notification( $entry_id, $form_id ) {
		// Only process job application form submissions
		$application_form_id = DDHH_JM_Formidable::get_job_application_form_id();
		if ( $form_id !== $application_form_id ) {
			return;
		}

		// Get entry data
		$entry = FrmEntry::getOne( $entry_id, true );
		if ( ! $entry ) {
			return;
		}

		// Extract field values
		$applicant_name    = '';
		$applicant_email   = '';
		$applicant_message = '';
		$job_id            = 0;

		foreach ( $entry->metas as $field_id => $value ) {
			$field = FrmField::getOne( $field_id );
			if ( ! $field ) {
				continue;
			}

			switch ( $field->field_key ) {
				case 'applicant_name':
					$applicant_name = sanitize_text_field( $value );
					break;
				case 'applicant_email':
					$applicant_email = sanitize_email( $value );
					break;
				case 'applicant_message':
					$applicant_message = sanitize_textarea_field( $value );
					break;
				case 'job_id':
					$job_id = absint( $value );
					break;
			}
		}

		// Validate required fields
		if ( empty( $applicant_name ) || empty( $applicant_email ) || empty( $applicant_message ) || empty( $job_id ) ) {
			error_log( 'DDHH Job Manager: Missing required fields in job application submission' );
			return;
		}

		// Get job post
		$post = get_post( $job_id );
		if ( ! $post || 'job_offer' !== $post->post_type ) {
			error_log( sprintf( 'DDHH Job Manager: Invalid job_id %d in application submission', $job_id ) );
			return;
		}

		// Get job details
		$job_title    = $post->post_title;
		$job_location = get_post_meta( $job_id, 'job_location', true );
		$job_type     = get_post_meta( $job_id, 'job_type', true );

		// Get provider contact email from post meta
		$provider_email = get_post_meta( $job_id, 'job_contact_email', true );
		if ( empty( $provider_email ) ) {
			error_log(
				sprintf(
					'DDHH Job Manager: Cannot send application notification for job #%d - job_contact_email not set',
					$job_id
				)
			);
			return;
		}

		// Build email subject
		$subject = sprintf( 'Neue Bewerbung für: %s', $job_title );

		// Build email body
		$body = sprintf(
			"Sie haben eine neue Bewerbung für Ihr Stellenangebot erhalten.\n\n" .
			"Stelle: %s\n" .
			"Standort: %s\n" .
			"Art: %s\n\n" .
			"--- Bewerber ---\n" .
			"Name: %s\n" .
			"E-Mail: %s\n\n" .
			"Nachricht:\n%s\n\n" .
			"---\n" .
			"Bitte antworten Sie direkt an %s.\n\n" .
			"Diese E-Mail wurde automatisch gesendet.",
			$job_title,
			$job_location ? $job_location : 'Nicht angegeben',
			$job_type ? $job_type : 'Nicht angegeben',
			$applicant_name,
			$applicant_email,
			$applicant_message,
			$applicant_email
		);

		// Set email headers
		$headers = array( 'Content-Type: text/html; charset=UTF-8' );

		// Convert plain text to HTML with line breaks
		$html_body = nl2br( esc_html( $body ) );

		// Send email
		$sent = wp_mail( $provider_email, $subject, $html_body, $headers );

		// Log if email fails
		if ( ! $sent ) {
			error_log(
				sprintf(
					'DDHH Job Manager: Failed to send application notification for job #%d "%s". Email may be disabled in Local WP environment.',
					$job_id,
					$job_title
				)
			);
		}
	}

	/**
	 * Notify opted-in mentors when a job is published
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	public static function notify_mentors_on_job_publish( $new_status, $old_status, $post ) {
		// Only trigger on job_offer posts
		if ( 'job_offer' !== $post->post_type ) {
			return;
		}

		// Only send notification on initial publish (not updates to already published posts)
		if ( 'publish' !== $new_status || 'publish' === $old_status ) {
			return;
		}

		// Get opted-in mentors
		$mentor_ids = DDHH_JM_User_Preferences::get_opted_in_mentors();

		// Check if any mentors opted in
		if ( empty( $mentor_ids ) ) {
			error_log(
				sprintf(
					'DDHH Job Manager: No opted-in mentors to notify for job #%d "%s"',
					$post->ID,
					$post->post_title
				)
			);
			return;
		}

		// Schedule async batch notifications
		$batch_count = DDHH_JM_Scheduler::schedule_mentor_notification_batch( $mentor_ids, $post->ID );

		// Log success
		error_log(
			sprintf(
				'DDHH Job Manager: Scheduled %d notification batches for job #%d "%s" to %d mentors',
				$batch_count,
				$post->ID,
				$post->post_title,
				count( $mentor_ids )
			)
		);
	}
}