<?php

new WPCOM_JSON_API_List_Terms_Endpoint( array(
	'description' => 'Get a list of a site\'s terms by taxonomy.',
	'group'       => 'taxonomy',
	'stat'        => 'terms',
	'method'      => 'GET',
	'path'        => '/sites/%s/taxonomies/%s/terms',
	'path_labels' => array(
		'$site'     => '(int|string) Site ID or domain',
		'$taxonomy' => '(string) Taxonomy',
	),
	'query_parameters' => array(
		'number'   => '(int=100) The number of terms to return. Limit: 1000.',
		'offset'   => '(int=0) 0-indexed offset.',
		'page'     => '(int) Return the Nth 1-indexed page of terms. Takes precedence over the <code>offset</code> parameter.',
		'search'   => '(string) Limit response to include only terms whose names or slugs match the provided search query.',
		'order'    => array(
			'ASC'  => 'Return terms in ascending order.',
			'DESC' => 'Return terms in descending order.',
		),
		'order_by' => array(
			'name'  => 'Order by the name of each tag.',
			'count' => 'Order by the number of posts in each tag.',
		),
	),
	'response_format' => array(
		'found' => '(int) The number of terms returned.',
		'terms' => '(array) Array of tag objects.',
	),
	'example_request'  => 'https://public-api.wordpress.com/rest/v1/sites/en.blog.wordpress.com/taxonomies/post_tags/terms?number=5'
) );

class WPCOM_JSON_API_List_Terms_Endpoint extends WPCOM_JSON_API_Endpoint {
	// /sites/%s/taxonomies/%s/terms -> $blog_id, $taxonomy
	function callback( $path = '', $blog_id = 0, $taxonomy = 'category' ) {
		$blog_id = $this->api->switch_to_blog_and_validate_user( $this->api->get_blog_id( $blog_id ) );
		if ( is_wp_error( $blog_id ) ) {
			return $blog_id;
		}

		if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
			$this->load_theme_functions();
		}

		$taxonomy_meta = get_taxonomy( $taxonomy );
		if ( false === $taxonomy_meta || ( ! $taxonomy_meta->public && 
				! current_user_can( $taxonomy_meta->cap->assign_terms ) ) ) {
			return new WP_Error( 'invalid_taxonomy', 'The taxonomy does not exist', 400 );
		}

		$args = $this->query_args();
		$args = $this->process_args( $args );

		$formatted_terms = $this->get_formatted_terms( $taxonomy, $args );

		if ( ! empty( $formatted_terms ) ) {
			/** This action is documented in json-endpoints/class.wpcom-json-api-site-settings-endpoint.php */
			do_action( 'wpcom_json_api_objects', 'terms', count( $formatted_terms ) );
		}

		return array(
			'found' => (int) $this->get_found( $taxonomy, $args ),
			'terms' => (array) $formatted_terms
		);
	}

	function process_args( $args ) {
		$args['get'] = 'all';

		if ( $args['number'] < 1 ) {
			$args['number'] = 100;
		} elseif ( 1000 < $args['number'] ) {
			return new WP_Error( 'invalid_number', 'The number parameter must be less than or equal to 1000.', 400 );
		}

		if ( isset( $args['page'] ) ) {
			if ( $args['page'] < 1 ) {
				$args['page'] = 1;
			}

			$args['offset'] = ( $args['page'] - 1 ) * $args['number'];
			unset( $args['page'] );
		}

		if ( $args['offset'] < 0 ) {
			$args['offset'] = 0;
		}

		$args['orderby'] = $args['order_by'];
		unset( $args['order_by'] );

		unset( $args['context'], $args['pretty'], $args['http_envelope'], $args['fields'] );
		return $args;
	}

	function get_found( $taxonomy, $args ) {
		unset( $args['offset'] );
		return wp_count_terms( $taxonomy, $args );
	}

	function get_formatted_terms( $taxonomy, $args ) {
		$terms = get_terms( $taxonomy, $args );

		$formatted_terms = array();
		foreach ( $terms as $term ) {
			$formatted_terms[] = $this->format_taxonomy( $term, $taxonomy, 'display' );
		}

		return $formatted_terms;
	}
}
