<?php
defined( 'ABSPATH' ) || die( 'No script kiddies please!' );

// generate a unique code, allows for lenght parameter
if ( ! function_exists( 'dnxcf_get_unique_code' ) ) {

	function dnxcf_get_unique_code( $length = '' ) {
		$code = md5( uniqid( rand(), true ) );

		if ( $length != '' ) {
			return substr( $code, 0, $length );
		} else {
			return $code;
		}
	}
}

// set default options for the plugin
function dnxcf_set_options() {
	$defaults = array(
		'dnxcf_pid_key'         => dnxcf_get_unique_code( 12 ),
		'dnxcf_recv_name'       => 'admin',
		'dnxcf_recv_email'      => get_bloginfo( 'admin_email' ),
		'dnxcf_from_email'      => 'info@some.url',
		'dnxcf_from_name'       => 'webmaster',
		'dnxcf_subject'         => array(
			__( 'I want to make a comment.', 'dnxcf' ),
			__( 'I want to ask a question.', 'dnxcf' ),
			__( 'I am interested in a product.', 'dnxcf' ),
			__( 'I have to report a problem.', 'dnxcf' ),
			__( 'Other (explain below)', 'dnxcf' ),
		),
		// 1 = text/plain
		// 2 = text/html
		'dnxcf_content_type'    => '1',
		'dnxcf_privacy'         => '',
		'dnxcf_DB_VERSION'      => '2',
	);
	return $defaults;
}

// helper function that starts up the DB
function dnxcf_db_init() {
	global $dnxcf_options;
	$dnxcf_options = get_option( 'dnxcf_options' );
	if ( false === $dnxcf_options ) {
		$dnxcf_options = dnxcf_set_options();
	}
	update_option( 'dnxcf_options', $dnxcf_options );
}

// helper function that performs a DB version update when needed
function dnxcf_db_update( $db_version ) {
	global $dnxcf_options;
	$db_defaults = dnxcf_set_options();
	$merge = wp_parse_args( $dnxcf_options, $db_defaults );
	// update DB version
	$merge['dnxcf_DB_VERSION'] = $db_version;
	update_option( 'dnxcf_options', $merge );
}

// helper function that performs a DB check and then an init/update action
function dnxcf_db_check() {
	global $dnxcf_options;
	if ( false === $dnxcf_options ) {
		dnxcf_db_init();
	}
	$old_db_version = $dnxcf_options['dnxcf_DB_VERSION'];
	$new_db_version = DNXCF_CURRENT_DB_VERSION;
	if ( empty( $old_db_version ) ) {
		dnxcf_db_init();
	}
	if ( intval( $old_db_version ) < intval( $new_db_version ) ) {
		dnxcf_db_update( $new_db_version );
	}
}

// helper function that sets the current DB Version for comparison
/*
 * Latest DB version: 5
*/
function dnxcf_set_db_version() {
	// Define plugin database version. This should only change when new settings are added.
	if ( ! defined( 'DNXCF_CURRENT_DB_VERSION' ) ) {
		define( 'DNXCF_CURRENT_DB_VERSION', 5 );
	}
}

// set the "from" email name to a custom option specified by the user
function dnxcf_update_from_name() {
	global $dnxcf_options;
	$dnxcf_options = get_option( 'dnxcf_options' );
	$dnxcf_defaults = dnxcf_set_options();
	$from_name = $dnxcf_options['dnxcf_from_name'];
	$orig_name = 'WordPress';

	$name = ( $orig_name != $from_name ) ? $from_name : false;
	return $name;
}
if ( dnxcf_update_from_name() ) {
	add_filter( 'wp_mail_from_name', 'dnxcf_update_from_name' );
}


// set the "from" email address to a custom option specified by the user
function dnxcf_update_from_email() {
	global $dnxcf_options;
	$dnxcf_options = get_option( 'dnxcf_options' );
	$dnxcf_defaults = dnxcf_set_options();
	$from_mail = $dnxcf_options['dnxcf_from_email'];
	$orig_mail = $dnxcf_defaults['dnxcf_from_email'];

	$mail = ( $orig_mail != $from_mail ) ? $from_mail : false;
	return $mail;
}
if ( dnxcf_update_from_email() ) {
	add_filter( 'wp_mail_from', 'dnxcf_update_from_email' );
}

/*
 * Set the content type for the email
*/
function dnxcf_update_content_type() {
	global $dnxcf_options;
	$dnxcf_options = get_option( 'dnxcf_options' );

	// 1 = text/plain
	// 2 = text/html
	$content_type = ( '1' == $dnxcf_options['dnxcf_content_type'] ) ? 'text/plain' : 'text/html';

	return $content_type;
}
add_filter( 'wp_mail_content_type', 'dnxcf_update_content_type' );