Email System

plugins/woocommerce/templates/emails/
├── admin-cancelled-order.php
├── admin-failed-order.php
├── admin-new-order.php
├── customer-completed-order.php
├── customer-invoice.php
├── customer-new-account.php
├── customer-note.php
├── customer-processing-order.php
├── customer-refunded-order.php
├── customer-reset-password.php
├── email-header.php              # Email header
├── email-footer.php              # Email footer
├── email-styles.php              # Inline CSS styles
└── email-addresses.php           # Customer addresses

// Customize completed order email subject
add_filter( 'woocommerce_email_subject_customer_completed_order', function( $subject, $order ) {
    return sprintf( 'Your order #%s has been shipped!', $order->get_order_number() );
}, 10, 2 );

// Customize completed order email heading
add_filter( 'woocommerce_email_heading_customer_completed_order', function( $heading, $order ) {
    return 'Your order is on its way!';
}, 10, 2 );

// Customize new order email subject (admin)
add_filter( 'woocommerce_email_subject_new_order', function( $subject, $order ) {
    return sprintf( 'New order #%s - %s', $order->get_order_number(), $order->get_billing_email() );
}, 10, 2 );

// Add content before email header
add_action( 'woocommerce_email_header', function( $email_heading, $email ) {
    if ( $email->id === 'customer_completed_order' ) {
        echo '<p style="text-align:center; font-weight:bold;">🎉 Thank you for your purchase!</p>';
    }
}, 10, 2 );

// Add content after order details
add_action( 'woocommerce_email_after_order_table', function( $order, $sent_to_admin, $plain_text, $email ) {
    if ( $email->id === 'customer_processing_order' ) {
        echo '<p>Your order will be processed within 24 hours.</p>';
    }
}, 10, 4 );

// Add content before email footer
add_action( 'woocommerce_email_footer', function( $email ) {
    echo '<p>Follow us on social media: @yourstore</p>';
} );

// Customize email styles
add_filter( 'woocommerce_email_styles', function( $css ) {
    $css .= '
        #template_header {
            background-color: #843cfb !important;
            border-bottom: 0 !important;
        }
        #template_header h1 {
            color: #ffffff !important;
        }
        a {
            color: #843cfb !important;
        }
    ';
    return $css;
} );

// Programmatically set email template colors
add_filter( 'woocommerce_email_background_color', function( $color ) {
    return '#f5f5f5';
} );

add_filter( 'woocommerce_email_base_color', function( $color ) {
    return '#843cfb';
} );

add_filter( 'woocommerce_email_body_background_color', function( $color ) {
    return '#ffffff';
} );

add_filter( 'woocommerce_email_text_color', function( $color ) {
    return '#333333';
} );

// Get all email classes
$emails = WC()->mailer()->get_emails();

// Send a specific email
if ( isset( $emails['WC_Email_Customer_Completed_Order'] ) ) {
    $emails['WC_Email_Customer_Completed_Order']->trigger( $order_id );
}

// Add email preview query parameter
add_action( 'template_redirect', function() {
    if ( isset( $_GET['preview_email'] ) && current_user_can( 'manage_woocommerce' ) ) {
        $order_id = isset( $_GET['order_id'] ) ? intval( $_GET['order_id'] ) : 0;
        $order = wc_get_order( $order_id );
        
        if ( ! $order ) {
            wp_die( 'Invalid order ID' );
        }
        
        $emails = WC()->mailer()->get_emails();
        $email_type = sanitize_key( $_GET['preview_email'] );
        
        if ( isset( $emails[ $email_type ] ) ) {
            echo $emails[ $email_type ]->get_content_html();
            exit;
        }
    }
} );

// Preview URL:
// /wp-admin/?preview_email=WC_Email_Customer_Completed_Order&order_id=123

// Add PDF invoice to completed order email
add_filter( 'woocommerce_email_attachments', function( $attachments, $email_id, $order ) {
    if ( $email_id === 'customer_completed_order' ) {
        $invoice_path = '/path/to/invoice-' . $order->get_id() . '.pdf';
        
        if ( file_exists( $invoice_path ) ) {
            $attachments[] = $invoice_path;
        }
    }
    
    return $attachments;
}, 10, 3 );

// Prevent completed order email for free orders
add_filter( 'woocommerce_email_enabled_customer_completed_order', function( $enabled, $order ) {
    if ( $order->get_total() == 0 ) {
        return false;
    }
    return $enabled;
}, 10, 2 );

// Add BCC to new order emails
add_filter( 'woocommerce_email_headers', function( $headers, $email_id, $order ) {
    if ( $email_id === 'new_order' ) {
        $headers .= "BCC: [email protected]\r\n";
    }
    return $headers;
}, 10, 3 );

// Get email object
$emails = WC()->mailer()->get_emails();
$completed_email = $emails['WC_Email_Customer_Completed_Order'];

// Get settings
$enabled = $completed_email->is_enabled();
$subject = $completed_email->get_subject();
$heading = $completed_email->get_heading();

// Update settings
$completed_email->update_option( 'subject', 'New subject line' );
$completed_email->update_option( 'heading', 'New heading' );