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

/**
 * Class NF_Action_Email
 */
final class NF_Actions_Email extends NF_Abstracts_Action
{
    /**
    * @var string
    */
    protected $_name  = 'email';

    /**
    * @var array
    */
    protected $_tags = array();

    /**
    * @var string
    */
    protected $_timing = 'late';

    /**
    * @var int
    */
    protected $_priority = 10;

    /**
    * Constructor
    */
    public function __construct()
    {
        parent::__construct();

        $this->_nicename = esc_html__( 'Email', 'ninja-forms' );

        $settings = Ninja_Forms::config( 'ActionEmailSettings' );

        $this->_settings = array_merge( $this->_settings, $settings );

        $this->_backwards_compatibility();
    }

    /*
    * PUBLIC METHODS
    */

    public function process( $action_settings, $form_id, $data )
    {
        $action_settings = $this->sanitize_address_fields( $action_settings );

        $errors = $this->check_for_errors( $action_settings );

        $headers = $this->_get_headers( $action_settings );

        if ( has_filter( 'ninja_forms_get_fields_sorted' ) ) {
            $fields_by_key = array();
            foreach( $data[ 'fields' ] as $field ){
                if( is_null( $field ) ) continue;
                if( is_array( $field ) ){
                    if( ! isset( $field[ 'key' ] ) ) continue;
                    $key = $field[ 'key' ];
                } else {
                    $key = $field->get_setting('key');
                }
                $fields_by_key[ $key ] = $field;
            }
            $sorted = apply_filters( 'ninja_forms_get_fields_sorted', array(), $data[ 'fields' ], $fields_by_key, $form_id );
            if( ! empty( $sorted ) )
                $data[ 'fields' ] = $sorted;
        }

        $attachments = $this->_get_attachments( $action_settings, $data );

        if( 'html' == $action_settings[ 'email_format' ] ) {
            $message = wpautop( $action_settings['email_message'] );
        } else {
            $message = $this->format_plain_text_message( $action_settings[ 'email_message_plain' ] );
        }

        $message = apply_filters( 'ninja_forms_action_email_message', $message, $data, $action_settings );

        try {
            /**
             * Hook into the email send to override functionality.
             * @return bool True if already sent. False to fallback to default behavior. Throw a new Exception if there is an error.
             */
            if( ! $sent = apply_filters( 'ninja_forms_action_email_send', false, $action_settings, $message, $headers, $attachments ) ){
              $sent = wp_mail($action_settings['to'], strip_tags( $action_settings['email_subject'] ), $message, $headers, $attachments);
            }
        } catch ( Exception $e ){
            $sent = false;
            $errors[ 'email_not_sent' ] = $e->getMessage();
        }

        if( is_user_logged_in() && current_user_can( 'manage_options' ) ) {
            $data[ 'actions' ][ 'email' ][ 'to' ] = $action_settings[ 'to' ];
            $data[ 'actions' ][ 'email' ][ 'headers' ] = $headers;
            $data[ 'actions' ][ 'email' ][ 'attachments' ] = $attachments;
        }

        $data[ 'actions' ][ 'email' ][ 'sent' ] = $sent;

        // Only show errors to Administrators.
        if( $errors && current_user_can( 'manage_options' ) ){
            $data[ 'errors' ][ 'form' ] = $errors;
        }

        if ( ! empty( $attachments ) ) {
            $this->_drop_csv();
        }

        return $data;
    }

    /**
     * Sanitizes email address settings
     * @since 3.2.2
     *
     * @param  array $action_settings
     * @return array
     */
    protected function sanitize_address_fields( $action_settings )
    {
        // Build a look array to compare our email address settings to.
        $email_address_settings = array( 'to', 'from_address', 'reply_to', 'cc', 'bcc' );

        // Loop over the look up values.
        foreach( $email_address_settings as $setting ) {
            // If the loop up values are not set in the action settings continue.
            if ( ! isset( $action_settings[ $setting ] ) ) continue;

            // If action settings do not match the look up values continue.
            if ( ! $action_settings[ $setting ] ) continue;

            // This is the array that will contain the sanitized email address values.
            $sanitized_array = array();

            /*
             * Checks to see action settings is array,
             * if not explodes to comma delimited array.
             */
            if( is_array( $action_settings[ $setting ] ) ) {
                $email_addresses = $action_settings[ $setting ];
            } else {
                $email_addresses = explode( ',', $action_settings[ $setting ] );
            }

            // Loop over our email addresses.
            foreach( $email_addresses as $email ) {

                // Updated to trim values in case there is a value with spaces/tabs/etc to remove whitespace
                $email = trim( $email );
                if ( empty( $email ) ) continue;

                // Build our array of the email addresses.
                $sanitized_array[] = $email;
            }
            // Sanitized our array of settings.
            $action_settings[ $setting ] = implode( ',' ,$sanitized_array );
        }
        return $action_settings;
    }

    protected function check_for_errors( $action_settings )
    {
        $errors = array();

        $email_address_settings = array( 'to', 'from_address', 'reply_to', 'cc', 'bcc' );

        foreach( $email_address_settings as $setting ){
            if( ! isset( $action_settings[ $setting ] ) ) continue;
            if( ! $action_settings[ $setting ] ) continue;


            $email_addresses = is_array( $action_settings[ $setting ] ) ? $action_settings[ $setting ] : explode( ',', $action_settings[ $setting ] );

            foreach( (array) $email_addresses as $email ){
                $email = trim( $email );
                if ( false !== strpos( $email, '<' ) && false !== strpos( $email, '>' ) ) {
                    preg_match('/(?:<)([^>]*)(?:>)/', $email, $email);
                    $email = $email[ 1 ];
                }
                if( ! is_email( $email ) ) {
                    $errors[ 'invalid_email' ] = sprintf( esc_html__( 'Your email action "%s" has an invalid value for the "%s" setting. Please check this setting and try again.', 'ninja-forms'), $action_settings[ 'label' ], $setting );
                }
            }
        }

        return $errors;
    }

    private function _get_headers( $settings )
    {
        $headers = array();

        $headers[] = 'Content-Type: text/' . $settings[ 'email_format' ];
        $headers[] = 'charset=UTF-8';
        $headers[] = 'X-Ninja-Forms:ninja-forms'; // Flag for transactional email.

        $headers[] = $this->_format_from( $settings );

        $headers = array_merge( $headers, $this->_format_recipients( $settings ) );

        return $headers;
    }

    private function _get_attachments( $settings, $data )
    {
        $attachments = array();

        if( isset( $settings[ 'attach_csv' ] ) && 1 == $settings[ 'attach_csv' ] ){
            $attachments[] = $this->_create_csv( $data[ 'fields' ] );
        }

        if( ! isset( $settings[ 'id' ] ) ) $settings[ 'id' ] = '';

        // Allow admins to attach files from media library
        if (isset($settings['file_attachment']) && 0 < strlen($settings['file_attachment'])) {
            $file_path = '';
            $media_id = attachment_url_to_postid($settings['file_attachment']);

            if($media_id !== 0) {
                $file_path = get_attached_file($media_id);
                if (0 < strlen($file_path)) {
                    $attachments[] = $file_path;
                }
            }
        }

        $attachments = apply_filters( 'ninja_forms_action_email_attachments', $attachments, $data, $settings );

        return $attachments;
    }

    private function _format_from( $settings )
    {
        $from_name = get_bloginfo( 'name', 'raw' );
        $from_name = apply_filters( 'ninja_forms_action_email_from_name', $from_name );
        $from_name = ( $settings[ 'from_name' ] ) ? $settings[ 'from_name' ] : $from_name;

        $from_address = get_bloginfo( 'admin_email' );
        $from_address = apply_filters( 'ninja_forms_action_email_from_address', $from_address );
        $from_address = ( $settings[ 'from_address' ] ) ? $settings[ 'from_address' ] : $from_address;

        return $this->_format_recipient( 'from', $from_address, $from_name );
    }

    private function _format_recipients( $settings )
    {
        $headers = array();

        $recipient_settings = array(
            'Cc' => $settings[ 'cc' ],
            'Bcc' => $settings[ 'bcc' ],
            'Reply-to' => $settings[ 'reply_to' ],
        );

        foreach( $recipient_settings as $type => $emails ){

            $emails = explode( ',', $emails );

            foreach( $emails as $email ) {

                if( ! $email ) continue;

                $matches = array();
                if (preg_match('/^"?(?<name>[^<"]+)"? <(?<email>[^>]+)>$/', $email, $matches)) {
                    $headers[] = $this->_format_recipient($type, $matches['email'], $matches['name']);
                } else {
                    $headers[] = $this->_format_recipient($type, $email);
                }
            }
        }

        return $headers;
    }

    private function _format_recipient( $type, $email, $name = '' )
    {
        $type = ucfirst( $type );

        if( ! $name ) $name = $email;

        $recipient = "$type: $name <$email>";

        return $recipient;
    }

    private function _create_csv( $fields )
    {
        $csv_array = array();

        // Get our current date.
        $date_format = Ninja_Forms()->get_setting( 'date_format' );
        $today = date( $date_format, current_time( 'timestamp' ) );
        $csv_array[ 0 ][] = 'Date Submitted';
        $csv_array[ 1 ][] = $today;

        foreach( $fields as $field ){

            $ignore = array(
                'hr',
                'submit',
                'html',
                'creditcardcvc',
                'creditcardexpiration',
                'creditcardfullname',
                'creditcardnumber',
                'creditcardzip',
            );

            $ignore = apply_filters( 'ninja_forms_csv_ignore_fields', $ignore );

            if( ! isset( $field[ 'label' ] ) ) continue;
            if( in_array( $field[ 'type' ], $ignore ) ) continue;

            $label = ( '' != $field[ 'admin_label' ] ) ? $field[ 'admin_label' ] : $field[ 'label' ];

            $value = WPN_Helper::stripslashes( $field[ 'value' ] );
            if ( empty( $value ) && ! isset( $value ) ) {
                $value = '';
            }
            if ( is_array( $value ) ) {
                $value = implode( ',', $value );
            }

            // add filter to add single quote if first character in value is '='
            $value = apply_filters( 'ninja_forms_subs_export_field_value_' . $field[ 'type' ], $value, $field );

            $csv_array[ 0 ][] = $label;
            $csv_array[ 1 ][] = $value;
        }

        $csv_content = WPN_Helper::str_putcsv( $csv_array,
            apply_filters( 'ninja_forms_sub_csv_delimiter', ',' ),
            apply_filters( 'ninja_forms_sub_csv_enclosure', '"' ),
            apply_filters( 'ninja_forms_sub_csv_terminator', "\n" )
        );

        $upload_dir = wp_upload_dir();
        $path = trailingslashit( $upload_dir['path'] );

        // create temporary file
        $path = tempnam( $path, 'Sub' );
        $temp_file = fopen( $path, 'r+' );

        // write to temp file
        fwrite( $temp_file, $csv_content );
        fclose( $temp_file );

        // find the directory we will be using for the final file
        $path = pathinfo( $path );
        $dir = $path['dirname'];
        $basename = $path['basename'];

        // create name for file
        $new_name = apply_filters( 'ninja_forms_submission_csv_name', 'ninja-forms-submission' );

        // remove a file if it already exists
        if( file_exists( $dir.'/'.$new_name.'.csv' ) ) {
            unlink( $dir.'/'.$new_name.'.csv' );
        }

        // move file
        rename( $dir.'/'.$basename, $dir.'/'.$new_name.'.csv' );
        return $dir.'/'.$new_name.'.csv';
    }

    /**
     * Function to delete csv file from temp directory after Email Action has completed.
     */
    private function _drop_csv()
    {
        $upload_dir = wp_upload_dir();
        $path = trailingslashit( $upload_dir['path'] );

        // create name for file
        $new_name = apply_filters( 'ninja_forms_submission_csv_name', 'ninja-forms-submission' );

        // remove a file if it already exists
        if( file_exists( $path.'/'.$new_name.'.csv' ) ) {
            unlink( $path.'/'.$new_name.'.csv' );
        }
    }

    /*
     * Backwards Compatibility
     */

    private function _backwards_compatibility()
    {
        add_filter( 'ninja_forms_sub_csv_delimiter',        array( $this, 'ninja_forms_sub_csv_delimiter'        ), 10, 1 );
        add_filter( 'ninja_sub_csv_enclosure',              array( $this, 'ninja_sub_csv_enclosure'              ), 10, 1 );
        add_filter( 'ninja_sub_csv_terminator',             array( $this, 'ninja_sub_csv_terminator'             ), 10, 1 );
        add_filter( 'ninja_forms_action_email_attachments', array( $this, 'ninja_forms_action_email_attachments' ), 10, 3 );
    }

    public function ninja_forms_sub_csv_delimiter( $delimiter )
    {
        return apply_filters( 'nf_sub_csv_delimiter', $delimiter );
    }

    public function ninja_sub_csv_enclosure( $enclosure )
    {
        return apply_filters( 'nf_sub_csv_enclosure', $enclosure );
    }

    public function ninja_sub_csv_terminator( $terminator )
    {
        return apply_filters( 'nf_sub_csv_terminator', $terminator );
    }

    public function ninja_forms_action_email_attachments( $attachments, $form_data, $action_settings )
    {
        return apply_filters( 'nf_email_notification_attachments', $attachments, $action_settings[ 'id' ] );
    }

    private function format_plain_text_message( $message )
    {
        $message =  str_replace( array( '<table>', '</table>', '<tr><td>', '' ), '', $message );
        $message =  str_replace( '</td><td>', ' ', $message );
        $message =  str_replace( '</td></tr>', "\r\n", $message );
        return strip_tags( $message );
    }
}