<?php
/**
 * Confirmation e-mails. Hooks the `advk_entry_created` action and sends a
 * templated confirmation to the participant plus an optional admin notice.
 */

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

class ADVK_Emails {

	public function hooks() {
		add_action( 'advk_entry_created', array( $this, 'on_entry_created' ), 10, 4 );
	}

	/**
	 * @param int    $id    Entry id.
	 * @param int    $day   Day.
	 * @param string $email Participant email.
	 * @param string $losnr Lot number.
	 */
	public function on_entry_created( $id, $day, $email, $losnr ) {
		$opts = ADVK_Settings::get_options();

		$entry = ADVK_Entries::get( $id );
		if ( ! $entry ) {
			return;
		}

		$prize    = $this->prize_for_day( (int) $day );
		$sitename = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
		$headers  = self::mail_headers( $opts );

		$replace = array(
			'{first}'    => $entry->first_name,
			'{last}'     => $entry->last_name,
			'{email}'    => $entry->email,
			'{day}'      => (int) $day,
			'{prize}'    => $prize,
			'{losnr}'    => $losnr,
			'{sitename}' => $sitename,
		);

		// Participant confirmation (sent as a styled HTML mail).
		if ( ! empty( $opts['email_enabled'] ) && is_email( $email ) ) {
			$subject = strtr( (string) $opts['email_subject'], $replace );
			$body    = strtr( (string) $opts['email_body'], $replace );

			$html = self::html_wrap( $subject, $body, $opts );
			wp_mail( $email, $subject, $html, self::mail_headers( $opts, true ) );
		}

		// Admin notification.
		if ( ! empty( $opts['admin_notify'] ) ) {
			$admin_email = is_email( $opts['admin_email'] ) ? $opts['admin_email'] : get_option( 'admin_email' );
			$subject     = sprintf(
				/* translators: %d: day number */
				__( 'Neue Adventskalender-Teilnahme (Türchen %d)', 'adventura-interactive-advent-calendar' ),
				(int) $day
			);
			$body = sprintf(
				/* translators: 1: name, 2: email, 3: day, 4: result, 5: los number */
				__( "Neue Teilnahme:\n\nName: %1\$s\nE-Mail: %2\$s\nTürchen: %3\$d\nErgebnis: %4\$s richtig\nLos-Nr.: %5\$s", 'adventura-interactive-advent-calendar' ),
				trim( $entry->first_name . ' ' . $entry->last_name ),
				$entry->email,
				(int) $day,
				(int) $entry->correct_count . '/' . (int) $entry->total_questions,
				$losnr
			);

			wp_mail( $admin_email, $subject, $body, $headers );
		}
	}

	/**
	 * Build wp_mail() headers with a custom From name/address so the plugin
	 * mails are not sent as "WordPress <wordpress@…>". Falls back to the site
	 * name and admin address when the settings are empty.
	 *
	 * @param array $opts Plugin options.
	 * @param bool  $html Whether the mail body is HTML.
	 * @return string[]
	 */
	public static function mail_headers( $opts, $html = false ) {
		$name = isset( $opts['email_from_name'] ) ? trim( (string) $opts['email_from_name'] ) : '';
		if ( '' === $name ) {
			$name = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
		}
		$from = isset( $opts['email_from_email'] ) ? $opts['email_from_email'] : '';
		if ( ! is_email( $from ) ) {
			$from = get_option( 'admin_email' );
		}
		$type    = $html ? 'text/html' : 'text/plain';
		$headers = array( 'Content-Type: ' . $type . '; charset=UTF-8' );
		if ( is_email( $from ) ) {
			$headers[] = sprintf( 'From: %s <%s>', $name, $from );
		}
		return $headers;
	}

	/**
	 * Accent colour for the e-mail header, derived from the active theme (or the
	 * custom accent when the custom palette is in use).
	 *
	 * @param array $opts Plugin options.
	 * @return string Hex colour.
	 */
	private static function brand_accent( $opts ) {
		$theme = isset( $opts['theme'] ) ? (string) $opts['theme'] : 'beere';
		if ( 'custom' === $theme ) {
			$hex = sanitize_hex_color( (string) ( $opts['custom_accent'] ?? '' ) );
			if ( $hex ) {
				return $hex;
			}
		}
		$map = array(
			'beere'     => '#b4452e',
			'tanne'     => '#2f6b4f',
			'amber'     => '#b5701f',
			'winter'    => '#2f6ba8',
			'ostern'    => '#4f9a4a',
			'halloween' => '#d67a1e',
		);
		return isset( $map[ $theme ] ) ? $map[ $theme ] : '#b4452e';
	}

	/**
	 * Wrap a plain-text mail body in a simple, mail-client-safe HTML shell
	 * (inline styles, table layout) branded with the site name and accent
	 * colour. The plain text is escaped and its line breaks are preserved.
	 *
	 * @param string $heading     Headline (usually the subject line).
	 * @param string $text        Plain-text body with {placeholders} already replaced.
	 * @param array  $opts        Plugin options.
	 * @param string $footer_html Optional trusted HTML appended in the footer (e.g. an unsubscribe link).
	 * @return string HTML document body.
	 */
	public static function html_wrap( $heading, $text, $opts, $footer_html = '', $cta = null ) {
		$accent   = self::brand_accent( $opts );
		$sitename = esc_html( wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES ) );
		$body     = wpautop( esc_html( (string) $text ) );
		$heading  = esc_html( (string) $heading );
		$font     = "-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif";

		// Optional call-to-action button (e.g. a double-opt-in confirm link).
		$cta_html = '';
		if ( is_array( $cta ) && ! empty( $cta['url'] ) && ! empty( $cta['label'] ) ) {
			$cta_html = '<div style="margin:22px 0 6px;"><a href="' . esc_url( $cta['url'] ) . '" style="display:inline-block;background:' . esc_attr( $accent ) . ';color:#ffffff;text-decoration:none;font-weight:700;font-size:15px;padding:13px 26px;border-radius:10px;">' . esc_html( $cta['label'] ) . '</a></div>';
		}

		// Header: configured logo, otherwise the site name in the accent colour.
		$logo_id   = isset( $opts['email_logo_id'] ) ? (int) $opts['email_logo_id'] : 0;
		$logo_html = '';
		if ( $logo_id ) {
			$src = wp_get_attachment_image_url( $logo_id, 'medium' );
			if ( $src ) {
				$logo_html = '<img src="' . esc_url( $src ) . '" alt="' . esc_attr( $sitename ) . '" style="max-height:54px;max-width:240px;height:auto;width:auto;display:inline-block;" />';
			}
		}
		$header_inner = '' !== $logo_html
			? $logo_html
			: '<span style="font-size:22px;font-weight:800;letter-spacing:.2px;color:' . esc_attr( $accent ) . ';">' . $sitename . '</span>';

		// Footer: configurable text + copyright + optional unsubscribe link.
		$footer_text = isset( $opts['email_footer_text'] ) ? trim( (string) $opts['email_footer_text'] ) : '';
		$footer  = '';
		if ( '' !== $footer_text ) {
			$footer .= '<div style="color:#8a8078;">' . nl2br( esc_html( $footer_text ) ) . '</div>';
		}
		$footer .= '<div style="color:#a89f96;margin-top:' . ( '' !== $footer_text ? '8px' : '0' ) . ';">&copy; ' . esc_html( wp_date( 'Y' ) ) . ' ' . $sitename . '</div>';
		if ( '' !== $footer_html ) {
			$footer .= '<div style="margin-top:10px;">' . $footer_html . '</div>';
		}

		ob_start();
		?>
<div style="margin:0;padding:28px 12px;background:#f2ede6;font-family:<?php echo esc_attr( $font ); ?>;">
	<table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="max-width:600px;margin:0 auto;border-collapse:separate;background:#ffffff;border:1px solid #e8e0d6;border-radius:18px;overflow:hidden;">
		<tr><td style="padding:28px 30px 22px;text-align:center;background:#ffffff;"><?php echo $logo_html !== '' ? $logo_html : $header_inner; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- logo src/site name escaped above. ?></td></tr>
		<tr><td style="height:4px;line-height:4px;font-size:0;background:<?php echo esc_attr( $accent ); ?>;">&nbsp;</td></tr>
		<tr><td style="padding:32px 34px;background:#ffffff;">
			<h1 style="margin:0 0 16px;font-size:22px;line-height:1.3;color:#2a211c;font-weight:800;"><?php echo $heading; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- escaped above. ?></h1>
			<div style="font-size:15.5px;line-height:1.7;color:#4a4038;"><?php echo $body; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- esc_html + wpautop above. ?></div>
			<?php echo $cta_html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- URL/label escaped above. ?>
		</td></tr>
		<tr><td style="padding:20px 34px 26px;background:#faf7f2;border-top:1px solid #eee6da;font-size:12px;line-height:1.65;"><?php echo $footer; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- each part escaped above; footer_html is trusted. ?></td></tr>
	</table>
</div>
		<?php
		return ob_get_clean();
	}

	/**
	 * Prize title for a given day (from the authoritative calendar data).
	 *
	 * @param int $day Day.
	 * @return string
	 */
	private function prize_for_day( $day ) {
		foreach ( ADVK_Data::get_calendar() as $d ) {
			if ( (int) $d['day'] === $day ) {
				// List all prize titles for the door (multi-prize aware).
				if ( isset( $d['prizes'] ) && is_array( $d['prizes'] ) && ! empty( $d['prizes'] ) ) {
					$titles = array();
					foreach ( $d['prizes'] as $p ) {
						$t = isset( $p['title'] ) ? trim( (string) $p['title'] ) : '';
						if ( '' !== $t ) {
							$titles[] = $t;
						}
					}
					if ( ! empty( $titles ) ) {
						return implode( ', ', $titles );
					}
				}
				return isset( $d['prize'] ) ? (string) $d['prize'] : '';
			}
		}
		return '';
	}
}