<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Custom WooCommerce email notifications for deposits.
 */
class APD_Emails {

	public function __construct() {
		add_filter( 'woocommerce_email_classes', array( $this, 'register_emails' ) );
		add_action( 'apd_deposit_payment_complete', array( $this, 'trigger_deposit_received' ), 10, 2 );
		add_action( 'apd_full_payment_complete', array( $this, 'trigger_payment_complete' ), 10, 2 );
	}

	/**
	 * Register custom email classes.
	 *
	 * @param array $email_classes WooCommerce email classes.
	 * @return array
	 */
	public function register_emails( $email_classes ) {
		require_once APD_PLUGIN_DIR . 'includes/emails/class-apd-email-deposit-received.php';
		require_once APD_PLUGIN_DIR . 'includes/emails/class-apd-email-balance-due.php';
		require_once APD_PLUGIN_DIR . 'includes/emails/class-apd-email-payment-complete.php';

		$email_classes['APD_Email_Deposit_Received'] = new APD_Email_Deposit_Received();
		$email_classes['APD_Email_Balance_Due']      = new APD_Email_Balance_Due();
		$email_classes['APD_Email_Payment_Complete'] = new APD_Email_Payment_Complete();

		return $email_classes;
	}

	/**
	 * Trigger deposit received email.
	 *
	 * @param int      $order_id Order ID.
	 * @param WC_Order $order    Order object.
	 */
	public function trigger_deposit_received( $order_id, $order ) {
		if ( 'yes' !== apd_get_option( 'email_deposit_received', 'yes' ) ) {
			return;
		}

		WC()->mailer();
		do_action( 'apd_email_deposit_received_notification', $order_id );
	}

	/**
	 * Trigger full payment complete email.
	 *
	 * @param int      $order_id Order ID.
	 * @param WC_Order $order    Order object.
	 */
	public function trigger_payment_complete( $order_id, $order ) {
		if ( 'yes' !== apd_get_option( 'email_payment_complete', 'yes' ) ) {
			return;
		}

		WC()->mailer();
		do_action( 'apd_email_payment_complete_notification', $order_id );
	}

	/**
	 * Get editable email template defaults.
	 *
	 * @return array<string,array<string,string>>
	 */
	public static function get_email_template_defaults() {
		return array(
			'deposit_received' => array(
				'title'        => __( 'Deposit Received', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'description'  => __( 'Sent to the customer when their deposit payment is confirmed.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'subject'      => __( 'Your deposit payment for Order #{order_number}', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'heading'      => __( 'Deposit Payment Received', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'body'         => implode(
					"\n\n",
					array(
						__( 'Hi {customer_first_name},', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						__( 'Thank you for your deposit payment for order #{order_number}.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						'[deposit_summary]',
						__( 'You can pay your remaining balance from your account page or payment link when you are ready.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
					)
				),
				'button_label' => '',
			),
			'balance_due'      => array(
				'title'        => __( 'Balance Due Reminder', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'description'  => __( 'Sent as a reminder when a customer has an outstanding balance.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'subject'      => __( 'Balance payment due for Order #{order_number}', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'heading'      => __( 'Balance Payment Due', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'body'         => implode(
					"\n\n",
					array(
						__( 'Hi {customer_first_name},', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						__( 'This is a reminder that you still have an outstanding balance for order #{order_number}.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						'[deposit_summary]',
						'[pay_balance_button]',
					)
				),
				'button_label' => __( 'Pay Balance Now', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
			),
			'payment_complete' => array(
				'title'        => __( 'Payment Complete', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'description'  => __( 'Sent when the customer has paid the full remaining balance.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'subject'      => __( 'Payment complete for Order #{order_number}', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'heading'      => __( 'Payment Complete', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
				'body'         => implode(
					"\n\n",
					array(
						__( 'Hi {customer_first_name},', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						__( 'Great news! Your order #{order_number} has been fully paid.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
						'[deposit_summary]',
						__( 'Your order is now complete. Thank you for completing your payment.', 'advanced-partial-payment-or-deposit-for-woocommerce' ),
					)
				),
				'button_label' => '',
			),
		);
	}

	/**
	 * Get template config merged with saved settings.
	 *
	 * @param string $template_id Template key.
	 * @return array<string,string>
	 */
	public static function get_email_template_config( $template_id ) {
		$defaults = self::get_email_template_defaults();
		$settings = get_option( 'apd_settings', array() );
		$default  = $defaults[ $template_id ] ?? array();
		$subject  = $settings[ 'email_' . $template_id . '_subject' ] ?? '';
		$heading  = $settings[ 'email_' . $template_id . '_heading' ] ?? '';
		$body     = $settings[ 'email_' . $template_id . '_body' ] ?? '';
		$button   = $settings[ 'email_' . $template_id . '_button_label' ] ?? '';

		return array(
			'title'        => $default['title'] ?? '',
			'description'  => $default['description'] ?? '',
			'subject'      => '' !== trim( $subject ) ? $subject : ( $default['subject'] ?? '' ),
			'heading'      => '' !== trim( $heading ) ? $heading : ( $default['heading'] ?? '' ),
			'body'         => '' !== trim( wp_strip_all_tags( $body ) ) ? $body : ( $default['body'] ?? '' ),
			'button_label' => '' !== trim( $button ) ? $button : ( $default['button_label'] ?? '' ),
		);
	}

	/**
	 * Get placeholder replacements.
	 *
	 * @param WC_Order    $order           Order object.
	 * @param array|false $deposit_details Deposit details.
	 * @param bool        $formatted       Whether to format amounts with wc_price().
	 * @return array<string,string>
	 */
	public static function get_placeholder_values( $order, $deposit_details = false, $formatted = true ) {
		$first_name = $order ? $order->get_billing_first_name() : '';
		$total      = $deposit_details ? floatval( $deposit_details['total_amount'] ?? 0 ) : 0;
		$deposit    = $deposit_details ? floatval( $deposit_details['deposit_amount'] ?? 0 ) : 0;
		$paid       = $deposit_details ? floatval( $deposit_details['amount_paid'] ?? 0 ) : 0;
		$balance    = $deposit_details ? floatval( $deposit_details['balance_due'] ?? 0 ) : 0;

		if ( $formatted ) {
			$total   = wc_price( $total );
			$deposit = wc_price( $deposit );
			$paid    = wc_price( $paid );
			$balance = wc_price( $balance );
		} else {
			$total   = wc_format_decimal( $total, wc_get_price_decimals() );
			$deposit = wc_format_decimal( $deposit, wc_get_price_decimals() );
			$paid    = wc_format_decimal( $paid, wc_get_price_decimals() );
			$balance = wc_format_decimal( $balance, wc_get_price_decimals() );
		}

		return array(
			'{customer_first_name}' => $first_name,
			'{order_number}'        => $order ? $order->get_order_number() : '',
			'{order_date}'          => $order && $order->get_date_created() ? wc_format_datetime( $order->get_date_created() ) : '',
			'{total_amount}'        => $total,
			'{deposit_amount}'      => $deposit,
			'{amount_paid}'         => $paid,
			'{balance_due}'         => $balance,
			'{pay_balance_url}'     => $order ? $order->get_checkout_payment_url() : '',
			'{site_title}'          => wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES ),
		);
	}

	/**
	 * Render email body content from editable template fields.
	 *
	 * @param string     $template_id Template key.
	 * @param WC_Order   $order       Order object.
	 * @param array|bool $deposit     Deposit details.
	 * @param bool       $plain_text  Whether to render plain text.
	 * @return string
	 */
	public static function render_email_body( $template_id, $order, $deposit = false, $plain_text = false ) {
		$config = self::get_email_template_config( $template_id );
		$body   = $config['body'] ?? '';

		$body = strtr( $body, self::get_placeholder_values( $order, $deposit, ! $plain_text ) );
		$body = strtr(
			$body,
			array(
				'[deposit_summary]'    => self::render_deposit_summary_block( $template_id, $order, $deposit, $plain_text ),
				'[pay_balance_button]' => self::render_pay_balance_block( $template_id, $order, $plain_text ),
			)
		);

		if ( $plain_text ) {
			$body = str_replace( array( "\r\n", "\r" ), "\n", $body );
			return trim( preg_replace( "/\n{3,}/", "\n\n", wp_strip_all_tags( $body ) ) );
		}

		return wpautop( wp_kses_post( $body ) );
	}

	/**
	 * Render summary block token for the email body.
	 *
	 * @param string     $template_id Template key.
	 * @param WC_Order   $order       Order object.
	 * @param array|bool $deposit     Deposit details.
	 * @param bool       $plain_text  Whether to render plain text.
	 * @return string
	 */
	private static function render_deposit_summary_block( $template_id, $order, $deposit, $plain_text = false ) {
		if ( ! $order ) {
			return '';
		}

		// Part of the balance, such as a payment plan's next instalment, when that is all
		// the pay button collects. 0 when the whole balance is due.
		$due_now = 0;
		if ( $deposit && 'balance_due' === $template_id ) {
			$due_now = APD_Order::get_balance_amount_due_now( $order );
			$due_now = round( floatval( $deposit['balance_due'] ?? 0 ) - $due_now, wc_get_price_decimals() ) > 0 ? $due_now : 0;
		}

		if ( $plain_text ) {
			$lines = array();
			/* translators: %s: order number. */
			$lines[] = sprintf( __( 'Order Number: #%s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), $order->get_order_number() );

			if ( $deposit ) {
				if ( 'payment_complete' === $template_id ) {
					/* translators: %s: formatted total amount paid. */
					$lines[] = sprintf( __( 'Total Paid: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['total_amount'] ?? 0 ) );
				} elseif ( 'balance_due' === $template_id ) {
					/* translators: %s: formatted order total. */
					$lines[] = sprintf( __( 'Total Amount: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['total_amount'] ?? 0 ) );
					/* translators: %s: formatted amount already paid. */
					$lines[] = sprintf( __( 'Amount Paid: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['amount_paid'] ?? 0 ) );
					/* translators: %s: formatted balance still due. */
					$lines[] = sprintf( __( 'Balance Due: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['balance_due'] ?? 0 ) );
					if ( $due_now > 0 ) {
						/* translators: %s: formatted amount the next payment collects. */
						$lines[] = sprintf( __( 'Amount Due Now: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $due_now ) );
					}
				} else {
					/* translators: %s: formatted order total. */
					$lines[] = sprintf( __( 'Total Amount: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['total_amount'] ?? 0 ) );
					/* translators: %s: formatted deposit amount paid. */
					$lines[] = sprintf( __( 'Deposit Paid: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['deposit_amount'] ?? 0 ) );
					/* translators: %s: formatted balance still due. */
					$lines[] = sprintf( __( 'Balance Due: %s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), wc_price( $deposit['balance_due'] ?? 0 ) );
				}
			}

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

		ob_start();
		?>
		<table cellspacing="0" cellpadding="6" style="width:100%;border:1px solid #e5e5e5;margin-bottom:20px;" border="1">
			<tr>
				<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Order Number', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
				<td style="padding:12px;">#<?php echo esc_html( $order->get_order_number() ); ?></td>
			</tr>
			<?php if ( $deposit ) : ?>
				<?php if ( 'payment_complete' === $template_id ) : ?>
					<tr>
						<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Total Paid', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;"><?php echo wp_kses_post( wc_price( $deposit['total_amount'] ?? 0 ) ); ?></td>
					</tr>
				<?php elseif ( 'balance_due' === $template_id ) : ?>
					<tr>
						<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Total Amount', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;"><?php echo wp_kses_post( wc_price( $deposit['total_amount'] ?? 0 ) ); ?></td>
					</tr>
					<tr>
						<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Amount Paid', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;"><?php echo wp_kses_post( wc_price( $deposit['amount_paid'] ?? 0 ) ); ?></td>
					</tr>
					<tr>
						<th style="text-align:left;padding:12px;color:#e74c3c;font-weight:bold;"><?php esc_html_e( 'Balance Due', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;color:#e74c3c;font-weight:bold;"><?php echo wp_kses_post( wc_price( $deposit['balance_due'] ?? 0 ) ); ?></td>
					</tr>
					<?php if ( $due_now > 0 ) : ?>
					<tr>
						<th style="text-align:left;padding:12px;font-weight:bold;"><?php esc_html_e( 'Amount Due Now', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;font-weight:bold;"><?php echo wp_kses_post( wc_price( $due_now ) ); ?></td>
					</tr>
					<?php endif; ?>
				<?php else : ?>
					<tr>
						<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Total Amount', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;"><?php echo wp_kses_post( wc_price( $deposit['total_amount'] ?? 0 ) ); ?></td>
					</tr>
					<tr>
						<th style="text-align:left;padding:12px;"><?php esc_html_e( 'Deposit Paid', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;"><?php echo wp_kses_post( wc_price( $deposit['deposit_amount'] ?? 0 ) ); ?></td>
					</tr>
					<tr>
						<th style="text-align:left;padding:12px;color:#e74c3c;font-weight:bold;"><?php esc_html_e( 'Balance Due', 'advanced-partial-payment-or-deposit-for-woocommerce' ); ?></th>
						<td style="padding:12px;color:#e74c3c;font-weight:bold;"><?php echo wp_kses_post( wc_price( $deposit['balance_due'] ?? 0 ) ); ?></td>
					</tr>
				<?php endif; ?>
			<?php endif; ?>
		</table>
		<?php
		return ob_get_clean();
	}

	/**
	 * Render pay balance button token for the email body.
	 *
	 * @param string   $template_id Template key.
	 * @param WC_Order $order       Order object.
	 * @param bool     $plain_text  Whether to render plain text.
	 * @return string
	 */
	private static function render_pay_balance_block( $template_id, $order, $plain_text = false ) {
		if ( 'balance_due' !== $template_id || ! $order ) {
			return '';
		}

		$config = self::get_email_template_config( $template_id );
		$label  = $config['button_label'] ?: __( 'Pay Balance Now', 'advanced-partial-payment-or-deposit-for-woocommerce' );

		// Route through the balance flow, not straight to order-pay. Going direct left
		// the order total at the deposit amount and never marked a balance payment as
		// pending, so the customer was charged the wrong figure and credited nothing.
		$url = class_exists( 'APD_Pay_Balance' )
			? APD_Pay_Balance::get_email_pay_balance_url( $order )
			: $order->get_checkout_payment_url();

		if ( $plain_text ) {
			/* translators: 1: call to action label, 2: payment URL. */
			return sprintf( __( '%1$s: %2$s', 'advanced-partial-payment-or-deposit-for-woocommerce' ), $label, $url );
		}

		return sprintf(
			'<p><a href="%1$s" style="background:#2271b1;color:#fff;padding:10px 20px;text-decoration:none;border-radius:4px;display:inline-block;">%2$s</a></p>',
			esc_url( $url ),
			esc_html( $label )
		);
	}
}