<?php
namespace FrontGlut\Core;

defined( 'ABSPATH' ) || exit;

/**
 * Email templates with {placeholders}, HTML wrapper, optional async sending.
 */
class Mailer {

	public static function init() {
		add_action( 'frontglut_send_mail', array( __CLASS__, 'deliver' ), 10, 3 );
		add_filter( 'frontglut_default_settings', function ( $d ) {
			$d['emails'] = array( 'async' => 0, 'from_name' => '', 'from_email' => '', 'footer' => '' );
			foreach ( self::templates() as $key => $t ) {
				$d['emails'][ $key ] = array( 'enabled' => 1, 'subject' => $t['subject'], 'body' => $t['body'] );
			}
			return $d;
		} );
	}

	/** Registry of templates. Modules add via filter frontglut_email_templates. */
	public static function templates() {
		return apply_filters( 'frontglut_email_templates', array(
			'welcome'          => array( 'label' => __( 'Welcome (new user)', 'frontglut' ), 'subject' => 'Welcome to {site_name}', 'body' => "Hi {name},\n\nYour account on {site_name} is ready. You can log in here: {login_url}", 'vars' => 'name, username, login_url' ),
			'verify_email'     => array( 'label' => __( 'Email verification', 'frontglut' ), 'subject' => 'Confirm your email for {site_name}', 'body' => "Hi {name},\n\nPlease confirm your email address: {verify_url}", 'vars' => 'name, verify_url' ),
			'account_approved' => array( 'label' => __( 'Account approved', 'frontglut' ), 'subject' => 'Your account was approved', 'body' => "Hi {name},\n\nAn administrator approved your account. Log in: {login_url}", 'vars' => 'name, login_url' ),
			'admin_new_user'   => array( 'label' => __( 'Admin: new registration', 'frontglut' ), 'subject' => 'New registration: {username}', 'body' => "A new user registered on {site_name}.\n\nUsername: {username}\nEmail: {email}\nReview: {review_url}", 'vars' => 'username, email, review_url' ),
			'admin_new_post'   => array( 'label' => __( 'Admin: new submission', 'frontglut' ), 'subject' => 'New submission: {post_title}', 'body' => "A new submission is waiting on {site_name}.\n\nTitle: {post_title}\nBy: {author}\nStatus: {status}\nReview: {review_url}", 'vars' => 'post_title, author, status, review_url' ),
			'post_received'    => array( 'label' => __( 'Submitter: submission received', 'frontglut' ), 'subject' => 'We received "{post_title}"', 'body' => "Hi {author},\n\nThanks! Your submission \"{post_title}\" was received and is {status}.", 'vars' => 'post_title, author, status' ),
			'post_approved'    => array( 'label' => __( 'Submitter: approved', 'frontglut' ), 'subject' => '"{post_title}" is live', 'body' => "Hi {author},\n\nYour submission \"{post_title}\" was approved: {post_url}", 'vars' => 'post_title, author, post_url' ),
			'post_rejected'    => array( 'label' => __( 'Submitter: rejected', 'frontglut' ), 'subject' => '"{post_title}" needs changes', 'body' => "Hi {author},\n\nYour submission \"{post_title}\" was not approved.\nReason: {reason}\nEdit it here: {edit_url}", 'vars' => 'post_title, author, reason, edit_url' ),
		) );
	}

	public static function vars_defaults() {
		return array(
			'site_name'  => wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES ),
			'site_url'   => home_url( '/' ),
			'login_url'  => wp_login_url(),
		);
	}

	public static function replace( $text, array $vars ) {
		$vars = array_merge( self::vars_defaults(), $vars );
		$map  = array();
		foreach ( $vars as $k => $v ) {
			$map[ '{' . $k . '}' ] = is_scalar( $v ) ? (string) $v : '';
		}
		return strtr( (string) $text, $map );
	}

	/** Send a registered template. */
	public static function send_template( $key, $to, array $vars = array() ) {
		$cfg = Settings::get( 'emails.' . $key );
		if ( ! is_array( $cfg ) || empty( $cfg['enabled'] ) || ! $to ) {
			return false;
		}
		$subject = self::replace( $cfg['subject'], $vars );
		$body    = self::replace( $cfg['body'], $vars );
		return self::send( $to, $subject, $body );
	}

	/** Send (or queue) a plain-text body wrapped into an HTML layout. */
	public static function send( $to, $subject, $body ) {
		$to = (array) $to;
		if ( Settings::get( 'emails.async' ) ) {
			wp_schedule_single_event( time() + 5, 'frontglut_send_mail', array( $to, $subject, $body ) );
			return true;
		}
		return self::deliver( $to, $subject, $body );
	}

	public static function deliver( $to, $subject, $body ) {
		$headers = array( 'Content-Type: text/html; charset=UTF-8' );
		$fn      = Settings::get( 'emails.from_name' );
		$fe      = Settings::get( 'emails.from_email' );
		if ( $fe && is_email( $fe ) ) {
			$headers[] = 'From: ' . ( $fn ? wp_specialchars_decode( $fn ) : wp_specialchars_decode( get_bloginfo( 'name' ) ) ) . ' <' . $fe . '>';
		}
		return wp_mail( $to, wp_specialchars_decode( $subject, ENT_QUOTES ), self::layout( $body ), $headers );
	}

	public static function layout( $body ) {
		$html = wpautop( make_clickable( esc_html( $body ) ) );
		$foot = Settings::get( 'emails.footer' );
		$out  = '<div style="background:#f4f5f7;padding:24px;font-family:system-ui,Arial,sans-serif"><div style="max-width:560px;margin:auto;background:#fff;border-radius:10px;padding:28px;color:#1b1f27;line-height:1.55">';
		$out .= '<div style="font-weight:700;font-size:16px;margin-bottom:14px">' . esc_html( get_bloginfo( 'name' ) ) . '</div>' . $html;
		if ( $foot ) {
			$out .= '<hr style="border:0;border-top:1px solid #e5e7eb;margin:20px 0"><div style="color:#6b7280;font-size:12px">' . wp_kses_post( $foot ) . '</div>';
		}
		return $out . '</div></div>';
	}
}