wordpress: add custom fields to post editor

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/*
Plugin Name: Patti
Description: Modify Wordpress Add New Post for Adding Patti Data
Version: 1.0
Author: Ankit Agrawal
*/

/****************************************************************************/
/************************* ADD PATTI CUSTOM FIELDS  *************************/
add_action( 'admin_init', 'patti_admin' );
function patti_admin() {
	//add_meta_box( $id, $title, $callback, $post_type, $context, $priority, $callback_args ); 
	add_meta_box( 'patti_meta_box','Location Details','display_patti_meta_box','post', 'normal', 'high' );
	add_meta_box( 'patti_image_video', 'Image & Video', 'display_patti_image_video_meta_box', 'post', 'normal', 'high' );
}

//add meta box for patti topics and location
function display_patti_meta_box( $patti ) {
	$patti_tags = get_post_meta( $patti->ID, 'patti_tags', true );
	$patti_state = get_post_meta( $patti->ID, 'patti_state', true );
	$patti_city = get_post_meta( $patti->ID, 'patti_city', true );
?>
	<table>
	
		<tr>
			<td style="width: 150px">State</td>
				<td>
					<select style="width: 100px" name="patti_state">
						<?php
						// Generate all items of drop-down list of states
						$states = array(
							'Select State',
							'Uttar Pradesh',
							'Delhi',
							'Himachal Pradesh',
							'Maharashtra'
						);
						
						foreach ( $states as $state ) {	?>
							<option value="<?php echo $state; ?>"
							<?php echo selected( $state, $patti_state ); ?>>
							<?php echo $state; ?>
						<?php } ?>
					</select>
				</td>
		</tr>
		
		<tr>
			<td style="width: 150px">City</td>
				<td>
					<select style="width: 100px" name="patti_city">
						<?php
						// Generate all items of drop-down list of states
						$cities = array(
							'Select City',
							'Delhi',
							'Mumbai',
							'Lucknow',
							'Agra'
						);
						
						foreach ( $cities as $city ) {	?>
							<option value="<?php echo $city; ?>"
							<?php echo selected( $city, $patti_city); ?>>
							<?php echo $city; ?>
						<?php } ?>
					</select>
				</td>
		</tr>
		
	</table>
<?php }

//add metabox for patti image and video
function display_patti_image_video_meta_box( $patti ) {
	$patti_image = esc_url( get_post_meta( $patti->ID, 'patti_image', true ) );
	$patti_video = esc_url( get_post_meta( $patti->ID, 'patti_video', true ) );
?>
	<table>
	
		<tr>
			<td style="width: 150px">Image Path:</td>
			<td>
				<input id="patti_image" type="text" size="100" name="patti_image" value="<?php echo $patti_image; ?>" />
				<input id="upload_logo_button" type="button" class="button" value="<?php _e( 'Upload Image', 'patti' ); ?>" />
			</td>
		</tr>
		
		<tr>
			<td style="width: 150px">Video Path:</td>
				<td><input type="text" size="100" name="patti_video" value="<?php echo $patti_video; ?>" /></td>
		</tr>
		
	</table>
<?php }


//save patti fields
add_action( 'save_post','add_patti_fields', 10, 2 );
function add_patti_fields( $patti_id,$patti ) {
	// Check post type for post
	if ( $patti->post_type == 'post' ) {
	
		//implictly set content type to patti
		update_post_meta( $patti_id, 'content_type', 'patti');
		
		// Store data in post meta table if present in post data
		if ( isset( $_POST['patti_tags'] ) &&	$_POST['patti_tags'] != '' ) {
			update_post_meta( $patti_id, 'patti_tags',$_POST['patti_tags'] );
		}
		
		if ( isset( $_POST['patti_state'] ) &&	$_POST['patti_state'] != '' ) {
			update_post_meta( $patti_id, 'patti_state',	$_POST['patti_state'] );
		}
		
		if ( isset( $_POST['patti_city'] ) &&	$_POST['patti_city'] != '' ) {
			update_post_meta( $patti_id, 'patti_city',	$_POST['patti_city'] );
		}
		
		if ( isset( $_POST['patti_image'] ) &&	$_POST['patti_image'] != '' ) {
			update_post_meta( $patti_id, 'patti_image',	$_POST['patti_image'] );
		}
		
		if ( isset( $_POST['patti_video'] ) &&	$_POST['patti_video'] != '' ) {
			update_post_meta( $patti_id, 'patti_video',	$_POST['patti_video'] );
		}
		
	}
}

/****************************************************************************/
/****************************************************************************/


/*****************************************************************************/
/********************* ADD MEDIA UPLOADER **************************/
// load wordpress media uploader
function patti_enqueue_scripts() {
	wp_register_script( 'patti-upload', plugins_url() .'/Patti/patti-upload.js', array('jquery','media-upload','thickbox') );
	wp_enqueue_script('jquery');
	wp_enqueue_script('thickbox');
	wp_enqueue_style('thickbox');
	wp_enqueue_script('media-upload');
	wp_enqueue_script('patti-upload');
}
add_action('admin_enqueue_scripts', 'patti_enqueue_scripts');

// modify media uploader settings
function patti_options_setup() {
	global $pagenow;
	if ( 'media-upload.php' == $pagenow || 'async-upload.php' == $pagenow ) {
		// Now we'll replace the 'Insert into Post Button' inside Thickbox
		add_filter( 'gettext', 'replace_thickbox_text'  , 1, 3 );
	}
}
add_action( 'admin_init', 'patti_options_setup' );
function replace_thickbox_text($translated_text, $text, $domain) {
	if ('Insert into Post' == $text) {
		$referer = strpos( wp_get_referer(), 'patti-settings-image' );
		if ( $referer != '' ) {
			return __('Insert this image into Patti', 'patti' );
		}
	}
	return $translated_text;
}

/*******************************************************************/
/*****************************************************************************/


/****************************************************************************/
/********************* DISABLE DEFAULTS **********************/

//disable media buttons
add_action('admin_head', 'patti_remove_mediabuttons');
function patti_remove_mediabuttons()
{
	global $post;
	if($post->post_type == 'post' && current_user_can('publish_posts') )
	{
		remove_action( 'media_buttons', 'media_buttons' );
	}
}

//disable rich text editor
add_filter( 'user_can_richedit', 'disable_for_cpt' );
function disable_for_cpt( $default ) {
	global $post;
	if ( 'post' == get_post_type( $post ) )
		return false;
	return $default;
} 

/****************************************************************************/