<?php

use HTML_Forms\Form;
use HTML_Forms\Submission;

/**
 * @param array $args
 * @return array
 */
function hf_get_forms(array $args = array()) {
    $default_args = array(
        'post_type' => 'html-form',
        'post_status' =>  array( 'publish', 'draft', 'pending', 'future' ),
        'numberposts' => -1,
    );
    $args = array_merge($default_args, $args);
    $posts = get_posts($args);
    $forms = array_map('hf_get_form', $posts);
    return $forms;
}

/**
 * @param $form_id_or_slug int|string|WP_Post
 * @return Form
 * @throws Exception
 */
function hf_get_form( $form_id_or_slug ) {

    if( is_numeric( $form_id_or_slug ) || $form_id_or_slug instanceof WP_Post ) {
        $post = get_post( $form_id_or_slug );

        if( ! $post instanceof WP_Post || $post->post_type !== 'html-form' ) {
            throw new Exception( "Invalid form ID" );
        }
    } else {
        $posts = get_posts(
            array(
                'post_type' => 'html-form',
                'name' => $form_id_or_slug,
                'post_status' => 'publish',
                'numberposts' => 1,
            )
        );

        if( empty( $posts ) ) {
            throw new Exception( 'Invalid form slug' );
        }
        $post = $posts[0];
    }

    // get all post meta in a single call for performance
    $post_meta = get_post_meta( $post->ID );

    // grab & merge form settings
    $default_settings = array(
        'save_submissions' => 1,
        'hide_after_success' => 0,
        'redirect_url' => '',
        'required_fields' =>'',
        'email_fields' => '',
    );
    $default_settings = apply_filters( 'hf_form_default_settings', $default_settings );
    $settings = array();
    if( ! empty( $post_meta['_hf_settings'][0] ) ) {
        $settings = (array) maybe_unserialize( $post_meta['_hf_settings'][0] );
    }
    $settings = array_merge( $default_settings, $settings );

    // grab & merge form messages
    $default_messages = array(
        'success' => __('Thank you! We will be in touch soon.', 'html-forms'),
        'invalid_email' => __( 'Sorry, that email address looks invalid.', 'html-forms' ),
        'required_field_missing' => __( "Please fill in the required fields.", "html-forms" ),
        'error' => __( 'Oops. An error occurred.', 'html-forms' ),
	);
	$default_messages = apply_filters( 'hf_form_default_messages', $default_messages );
    $messages = array();
    foreach( $post_meta as $meta_key => $meta_values ) {
        if( strpos( $meta_key, 'hf_message_' ) === 0 ) {
            $message_key = substr( $meta_key, strlen( 'hf_message_' ) );
            $messages[$message_key] = (string) $meta_values[0];
        }
    }
    $messages = array_merge( $default_messages, $messages );

    // finally, create form instance
    $form = new Form( $post->ID );
    $form->title = $post->post_title;
    $form->slug = $post->post_name;
    $form->markup = $post->post_content;
    $form->settings = $settings;
    $form->messages = $messages;
    return $form;
}

/**
 * @param $form_id
 * @param array $args
 * @return Submission[]
 */
function hf_get_form_submissions( $form_id, array $args = array() ) {
    $default_args = array(
        'offset' => 0,
        'limit' => 1000,
    );
    $args = array_merge( $default_args, $args );

    global $wpdb;
    $table = $wpdb->prefix .'hf_submissions';
    $results = $wpdb->get_results( $wpdb->prepare( "SELECT s.* FROM {$table} s WHERE s.form_id = %d ORDER BY s.submitted_at DESC LIMIT %d, %d;", $form_id, $args['offset'], $args['limit'] ), OBJECT_K );
    $submissions = array();
    foreach( $results as $key => $object ) {
        $submission = Submission::from_object( $object );
        $submissions[$key] = $submission;
    }
    return $submissions;
}

/**
 * @param int $submission_id
 * @return Submission
 */
function hf_get_form_submission( $submission_id ) {
    global $wpdb;
    $table = $wpdb->prefix .'hf_submissions';
    $object = $wpdb->get_row( $wpdb->prepare( "SELECT s.* FROM {$table} s WHERE s.id = %d;", $submission_id ), OBJECT );
    $submission = Submission::from_object( $object );
    return $submission;
}
/**
 * @return array
 */
function hf_get_settings() {
    $default_settings = array(
        'load_stylesheet' => 0,
    );

    $settings = get_option( 'hf_settings', array() );

    // merge with default settings
    $settings = array_merge( $default_settings, $settings );

    /**
    * Filters the global HTML Forms hf_settings
    *
    * @param array $settings
    */
    $settings = apply_filters( 'hf_settings', $settings );

    return $settings;
}

/**
* Get element from array, allows for dot notation eg: "foo.bar"
*
* @param array $array
* @param string $key
* @param mixed $default
* @return mixed
*/
function hf_array_get( $array, $key, $default = null ) {
    if ( is_null( $key ) ) {
        return $array;
    }

    if ( isset( $array[$key] ) ) {
        return $array[$key];
    }

    foreach (explode( '.', $key ) as $segment) {
        if ( ! is_array( $array ) || ! array_key_exists( $segment, $array ) ) {
            return $default;
        }

        $array = $array[$segment];
    }

    return $array;
}

/**
 * Processes template tags like {{user.user_email}}
 *
 * @param string $template
 *
 * @return string
 */
function hf_template( $template ) {
    $replacers = new HTML_Forms\TagReplacers();
    $tags = array(
        'user'          => array( $replacers, 'user' ),
        'post'          => array( $replacers, 'post'),
        'url_params'    => array( $replacers, 'url_params' ),
    ); 

    /**
    * Filters the available tags in HTML Forms templates, like {{user.user_email}}.
    *
    * Can be used to add simple scalar replacements or more advanced replacement functions that accept a parameter.
    *
    * @param array $tags
    */
    $tags = apply_filters( 'hf_template_tags', $tags );

    $template = preg_replace_callback( '/\{\{ *(\w+)(?:\.([\w\.]+))? *(?:\|\| *(\w+))? *\}\}/', function( $matches ) use ( $tags ) {
        $tag = $matches[1];
        $param = ! isset( $matches[2] ) ? "" : $matches[2];
        $default = ! isset( $matches[3] ) ? "" : $matches[3];

        // do not change anything if we have no replacer with that key, could be custom user logic or another plugin.
        if( ! isset( $tags[ $tag] ) ) {
            return $matches[0];
        }

        $replacement = $tags[$tag];
        $value = is_callable( $replacement ) ? call_user_func_array( $replacement, array( $param ) ) : $replacement;
        return ! empty( $value ) ? $value : $default;
    }, $template );

    return $template;    
}

/**
 * @param string $string
 * @param array $data
 *
 * @return string
 */
function hf_replace_data_variables($string, $data = array(), $escape_function = null) {
    $string = preg_replace_callback( '/\[([a-zA-Z0-9\-\._]+)\]/', function($matches) use ($data, $escape_function) {
        $key = $matches[1];
        $replacement = hf_array_get( $data, $key, '' );
        $replacement = hf_field_value( $replacement );
        if ($escape_function !== null && is_callable($escape_function)) {
            $replacement = $escape_function($replacement);
        }
        return $replacement;
    }, $string );
    return $string;
} 

/**
* Returns a formatted field value. Detects file-, array- and date-types.
*
* Caveat: if value is a file, an HTML string is returned (which means email action should use "Content-Type: html" when it includes a file field).
*
* @param string|array $value
* @param int $limit 
* @return string
* @since 1.3.1
*/
function hf_field_value( $value, $limit = 0 ) {
    if( $value === '' ) {
        return $value;
    }

	if( hf_is_file( $value ) ) {
        $file_url = isset( $value['url'] ) ? $value['url'] : '';
        if( isset( $value['attachment_id'] ) ) {
            $file_url = admin_url( sprintf( 'post.php?action=edit&post=%d', $value['attachment_id'] ) );
        }
        $short_name = substr( $value['name'], 0, 20 );
        $suffix = strlen( $value['name'] ) > 20 ? '...' : '';
        return sprintf( '<a href="%s">%s%s</a> (%s)', esc_attr( $file_url ), esc_html( $short_name ), esc_html( $suffix ), hf_human_filesize( $value['size'] ) ); 
    }

    if( hf_is_date( $value ) ) {
        $date_format = get_option( 'date_format' );
        return date( $date_format, strtotime( $value ) );
    } 

    // join array-values with comma
    if( is_array( $value ) ) {
        $value = join( ', ', $value );
    }

    // limit string to certain length
    if( $limit > 0 ) {
        $limited = strlen($value) > $limit;
        $value = substr( $value, 0, $limit );

        if ($limited) {
            $value .= '...';
        }
    }

    // escape
    $value = wp_check_invalid_utf8($value);
    $value = htmlentities($value, ENT_NOQUOTES);
    return $value;
}

/**
* Returns true if value is a "file"
*
* @param mixed $value
* @return bool
*/
function hf_is_file( $value ) {
    return is_array( $value ) 
        && isset( $value['name'] ) 
        && isset( $value['size'] ) 
        && isset( $value['type'] );
}

/**
* Returns true if value looks like a date-string submitted from a <input type="date">
* @param mixed $value
* @return bool
* @since 1.3.1
*/
function hf_is_date( $value ) {
    return is_string( $value ) 
        && strlen( $value ) === 10 
        && preg_match( '/\d{2,4}[-\/]\d{2}[-\/]\d{2,4}/', $value ) > 0 
        && ( $timestamp = strtotime($value) ) 
        && $timestamp != false;
}

/** 
* @return string
*/
function hf_human_filesize($size, $precision = 2) {
    for( $i = 0; ($size / 1024) > 0.9; $i++, $size /= 1024 ) {
        // nothing, loop logic contains everything
    }
    $steps = array( 'B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB' );
    return round($size, $precision) . $steps[$i];
}