// version DEPRECATED. SEE PLUGIN INSTEAD
add_action(
    'init',
    function () {
		add_shortcode( 'gfsearch', 'gfsearch_shortcode' );
	}
);

/**
 * Processes the gfsearch shortcode to perform searching and displaying Gravity Forms entries
 * based on specified criteria and attributes.
 *
 * Notes:
 * This method allows searching for specific forms, multiple forms, or all forms. Custom formatting,
 * sorting, filtering, limiting results, and handling specific search conditions is supported.
 * Detailed formatting instructions are outlined above.
 *
 * Supported attributes include search fields, result limits, sorting directions, numeric comparisons,
 * and unique results handling.
 *
 * @param array  $atts An associative array of attributes, or default values.
 *
 * @param string $content Content of the shortcode, typically search values separated by '|'.
 *
 * @return string|false Formatted search results or false if search fails due to missing attributes or invalid setup.
 */
function gfsearch_shortcode( $atts, $content = null ) {
	/**
	 * Notes:
	 *
	 * For the target use 0 to search all forms or a form ID to search a specific form or a comma separated list of form IDs to
	 * search the specified forms.
	 *
	 * You can pass multiple id's to the search and display attributes, separated by a comma, in order to search or display multiple fields. If you are searching
	 * for multiple fields enter the corresponding value as the content for the shortcode with each value to search for separated by a | symbol. Make sure you have the
	 * same amount of values as fields you are searching and make sure they are in the same order.
	 *
	 * If you want custom formating for the display: Configure the attribute with the format you would like for the display and surround each entry property by curly braces
	 * i.e. display="This is example text before one field: {13} and this is some more ({14}), and this-{15} is the last field!). Each id {13}, {14}, and {15} will be replaced by
	 * the correct value and the rest of the string will stay the same. Just make sure not to enter any characters that would break the shortcode such as " or []. Limited HTML is allowed.
	 * Any entry property key can be used as a placeholder to be replaced with the value. For example, you can use {id} or {created_by} or a field id {13}, etc. See https://docs.gravityforms.com/entry-object/.
	 *
	 * When using this shortcode with Gravity View, you may need to prefix non-numeric keys with "gfs:" to prevent Gravity View from parsing them as merge tags.
	 * For example, use {gfs:id} instead of {id} when working with Gravity View. Both formats are supported by this shortcode.
	 *
	 * The search and display fields can be a field ID, entry property, or entry meta key.
	 *
	 * If you are searching for multiple values (fields) in the same entry you can use the search_mode attribute to determine if the entry must meet all the conditions
	 * or not. Default is all conditions. If you pass in the value any (search_mode="any") then the result will be returned if any condition matches.
	 *
	 * To perform a global search on the form for any field with the specified value, leave the corresponding search id blank. To just display the values from a field leave out the search attribute and the
	 * shortcode content.
	 *
	 * To check for multiple values for one field enter the field multiple times in the search attribute, with the desired values separated by a comma as the shortcode content and set the
	 * search_mode attribute to "any".
	 *
	 * If you would like to search for results where the value is greater or less than the provided search value use the greater_than or less_than attributes.
	 * The attribute expects the field id first and then the number to filter by separated by a space and comma. For example greater_than="4, 500" will filter out
	 * all entries where field 4 has a value of less than 500.
	 *
	 * If you want to sort the entries use the sort_key, sort_direction, and sort_is_num. <br>
	 * sort_key: The field ID, entry property, or entry meta key to sort the results. <br>
	 * sort_direction: The direction to sort the results. Can be ASC, DESC, or RAND. Case-insensitive. Default is DESC <br>
	 * sort_is_num: Indicates if the values of the specified key are numeric. Should be used in conjunction with the sort_key attribute. Default is true.
	 *              To set to false use the string false (sort_is_num="false") or an empty value such as 0 or an empty string.
	 *
	 * If you want to have a secondary sort within the first use the secondary_sort_key and secondary_sort_direction attributes. They work similar to the primary sorting attributes, the only difference being
	 * there is no random option for the sorting direction. There is also no "is_numeric" attribute. It is unnecessary here. Note also this attribute will be ignored if the primary sort direction is RAND.
	 *
	 * If you only want unique values use the attribute unique and give it any value (aside from 0 or an empty string).
	 *
	 * If you want to return a specific amount of results use the limit attribute. The default is one result. If you want to display all the results use the
	 * value 'all' (limit="all"), case-insensitive. If you enter a number greater than the total amount of results all of them will be returned. If you enter 0 or an empty string
	 * the default value will be used.
	 *
	 * You can specify the separator between results with the separator attribute (i.e. separator=&lt;br&gt;). Limited HTML (such as &lt;br&gt;) is allowed here.
	 *
	 * If you want to search for empty values, meaning where the specified field in the search attribute is empty, leave the content of the shortcode blank
	 * and use the search_empty attribute. You can give it any non-empty value (0, empty string, etc.). The default is false so if there is a search field
	 * with no value nothing will be returned.
	 *
	 * If you want to specify a default value to display when no results are found, use the default attribute (i.e. default="No results found").
	 * This value will be displayed if either no entries match the search criteria or if all entries are filtered out during processing.
	 * The default value is also used for individual blank values within entries. For example, if multiple entries are returned and some have
	 * values for the display fields while others don't, or if multiple fields are being displayed and some have values while others don't,
	 * the default value will be used for those individual blank values.
	 *
	 * If you want to turn each result into a link to the relevant entry in the admin panel, use the link attribute with any non-empty value
	 * (i.e. link="true"). This will wrap each result in an HTML anchor tag that links to the entry view page in the WordPress admin.
	 */

	$result = apply_filters( 'gogv_shortcode_process', $content );
	if ( $result !== $content ) {
		return $result;
	}

	$atts = shortcode_atts(
        [
			'target'                   => '0',
			'search'                   => '',
			'greater_than'             => false,
			'less_than'                => false,
			'display'                  => '',
			'sort_key'                 => 'id',
			'sort_direction'           => 'DESC',
			'sort_is_num'              => true,
			'secondary_sort_key'       => '',
			'secondary_sort_direction' => 'DESC',
			'unique'                   => false,
			'limit'                    => '1',
			'search_mode'              => 'all',
			'separator'                => '',
			'search_empty'             => false,
			'default'                  => '',
			'link'                     => false,
		],
		$atts,
		'gfsearch'
        );

	// Allow everything wp_kses_post allows plus <a> and its attributes
	$allowed_tags      = wp_kses_allowed_html( 'post' );
	$allowed_tags['a'] = [
		'href'   => true,
		'title'  => true,
		'target' => true,
		'rel'    => true,
		'class'  => true,
		'id'     => true,
		'style'  => true,
	];

	$content = html_entity_decode( $content, ENT_QUOTES );

	$form_id = array_map( 'intval', explode( ',', $atts['target'] ) );

	$search_criteria                          = [];
	$search_criteria['status']                = 'active';
	$search_criteria['field_filters']         = [];
	$search_criteria['field_filters']['mode'] = in_array( strtolower( $atts['search_mode'] ), [ 'all', 'any' ], true ) ? strtolower( $atts['search_mode'] ) : 'all';

	if ( ! empty( $atts['search'] ) && empty( $atts['display'] ) && ! $atts['search_empty'] ) {
		return '';
	}

	$search_ids = array_map( 'sanitize_text_field', explode( ',', $atts['search'] ) );
	$search_ids = array_map( 'trim', $search_ids );

	$content_values = array_map( 'trim', explode( '|', $content ) );

	foreach ( $search_ids as $index => $search_id ) {
		if ( empty( $search_id ) ) {
			continue;
		}
		$current_field = GFAPI::get_field( $form_id[0], $search_id );
		if ( 'number' === $current_field['type'] ) {
			$content_values[ $index ] = str_replace( ',', '', $content_values[ $index ] );
		}
		$search_criteria['field_filters'][] = [
			'key'   => $search_id,
			'value' => GFCommon::replace_variables( $content_values[ $index ], [], [] ),
		];
	}

	$sorting = [
		'key'        => sanitize_text_field( $atts['sort_key'] ),
		'direction'  => in_array( strtoupper( $atts['sort_direction'] ), [ 'ASC', 'DESC', 'RAND' ], true ) ? strtoupper( $atts['sort_direction'] ) : 'DESC',
		'is_numeric' => ! ( strtolower( $atts['sort_is_num'] ) === 'false' ) && $atts['sort_is_num'],
	];

	$secondary_sort_key       = sanitize_text_field( $atts['secondary_sort_key'] );
	$secondary_sort_direction = in_array( strtoupper( $atts['secondary_sort_direction'] ), [ 'ASC', 'DESC' ], true )
		? strtoupper( $atts['secondary_sort_direction'] )
		: 'DESC';

	$paging_offset = 0;
	$total_count   = 0;

	if ( 'all' !== strtolower( $atts['limit'] ) ) {
		$original_limit = empty( $atts['limit'] ) ? 1 : (int) $atts['limit'];

		if ( $secondary_sort_key ) {
			$atts['limit'] = 'all';
		}
	}

	if ( empty( $atts['limit'] ) ) {
		$page_size = 1;
	} elseif ( 'all' === strtolower( $atts['limit'] ) ) {
		$page_size = 25;
	} else {
		$page_size = min( intVal( $atts['limit'] ), 25 );
	}
	$paging = [
		'offset'    => $paging_offset,
		'page_size' => $page_size,
	];

	$entries = GFAPI::get_entries( $form_id, $search_criteria, $sorting, $paging, $total_count );

	if ( 'all' === $atts['limit'] || intVal( $atts['limit'] ) > 25 ) {
		$count = count( $entries );
		while ( $total_count > $count ) {
			$paging_offset += 25;
			$paging         = [
				'offset'    => $paging_offset,
				'page_size' => 25,
			];
			$new_entries    = GFAPI::get_entries( $form_id, $search_criteria, $sorting, $paging, $total_count );
			array_push( $entries, ...$new_entries ); // $entries = array_merge( $entries, $new_entries );
			if ( is_numeric( $atts['limit'] ) && count( $entries ) > $atts['limit'] ) {
				break;
			}
		}
		if ( is_numeric( $atts['limit'] ) ) {
			$entries = array_slice( $entries, 0, intVal( $atts['limit'] ) );
		}
	}

	if ( empty( $entries ) ) {
		return wp_kses_post( $atts['default'] );
	}

	if ( ! empty( $secondary_sort_key ) && 'RAND' !== $sorting['direction'] ) {
		$grouped_entries = [];
		foreach ( $entries as $entry ) {
			$primary_key_value                       = $entry[ $sorting['key'] ] ?? ''; // Use the primary sort key as the group key
			$grouped_entries[ $primary_key_value ][] = $entry;
		}

		// Sort each group based on the secondary sort key
		foreach ( $grouped_entries as &$group ) {
			usort(
                $group,
                function ( $entry1, $entry2 ) use ( $secondary_sort_key, $secondary_sort_direction ) {
					$value1 = $entry1[ $secondary_sort_key ] ?? '';
					$value2 = $entry2[ $secondary_sort_key ] ?? '';

					// For non-numeric values, use string comparison
					if ( ! is_numeric( $value1 ) || ! is_numeric( $value2 ) ) {
						if ( strtoupper( $secondary_sort_direction ) === 'ASC' ) {
							return strcasecmp( $value1, $value2 ); // Ascending order for strings
						}

						return strcasecmp( $value2, $value1 ); // Descending order for strings
					}

					// If numeric, compare numerically
					$value1 = (float) $value1;
					$value2 = (float) $value2;

					if ( strtoupper( $secondary_sort_direction ) === 'ASC' ) {
						return $value1 <=> $value2; // Ascending order for numbers
					}

					return $value2 <=> $value1; // Descending order for numbers
				}
                );
		}

		unset( $group ); // Clean up the reference variable to avoid potential bugs

		// Flatten groups back into a single array, retaining primary sort order
		$entries = [];
		foreach ( $grouped_entries as $group ) {
			$entries = array_merge( $entries, $group );
		}
	}

	if ( isset( $original_limit ) && $original_limit < count( $entries ) ) {
		$entries = array_slice( $entries, 0, $original_limit );
	}

	if ( $atts['greater_than'] ) {
		$greater_than = array_map( 'trim', explode( ',', $atts['greater_than'] ) );
		$entries      = array_filter(
            $entries,
            function ( $entry ) use ( $greater_than ) {
				if ( $entry[ intval( $greater_than[0] ) ] > floatval( $greater_than[1] ) ) {
					return true;
				}
				return false;
			}
            );
	}
	if ( $atts['less_than'] ) {
		$less_than = array_map( 'trim', explode( ',', $atts['less_than'] ) );
		$entries   = array_filter(
            $entries,
            function ( $entry ) use ( $less_than ) {
				if ( $entry[ intval( $less_than[0] ) ] < floatval( $less_than[1] ) ) {
					return true;
				}
				return false;
			}
            );
	}

	$results = [];

	$regex = '/{(gfs:)?([^{}]+)}/';
	preg_match_all( $regex, $atts['display'], $matches );

	if ( empty( $matches[0] ) ) {
		$display_ids = array_map( 'sanitize_text_field', explode( ',', $atts['display'] ) );
		$display_ids = array_map( 'trim', $display_ids );
	} else {
		// Extract the actual IDs, removing the prefix if present
		$display_ids = array_map(
				function ( $individual_match ) {
					// Remove the curly braces
					$content = str_replace( [ '{', '}' ], '', $individual_match );
					// Remove the gfs: prefix if present
					return str_replace( 'gfs:', '', $content );
				},
            $matches[0]
		);
		$display_ids = array_map( 'sanitize_text_field', $display_ids );
	}

	$multi_input_present = false;
	foreach ( $entries as $entry ) {
		$entry_results = [];
		foreach ( $display_ids as $display_id ) {

			$field = GFAPI::get_field( $entry['form_id'], $display_id );
			// phpcs:disable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
			if ( 'number' === $field->type ) {
				$field_value = GFCommon::format_number( $entry[ $display_id ], $field->numberFormat, $entry['currency'], true );
			} elseif ( 'date' === $field->type ) {
				$field_value = GFCommon::date_display( $entry[ $display_id ], 'Y-m-d', $field->dateFormat );
			} elseif ( is_multi_input_field( $field ) ) {
				$multi_input_present = true;
				$ids                 = array_column( $field['inputs'], 'id' );
				$field_results       = [];
				foreach ( $ids as $id ) {
					if ( ! empty( $entry[ $id ] ) ) {
						$field_results[] = $entry[ $id ];
					}
				}
				$field_value = implode( ' ', $field_results );
			} else {
				$field_value = $entry[ $display_id ];
			}

			// Use default value if field value is empty
			if ( '' === $field_value || is_null( $field_value ) ) {
				$field_value = wp_kses_post( $atts['default'] );
			}

			$entry_results[ $display_id ] = $field_value;
		}

		// We only need to filter if the default value is empty
		if ( '' === $atts['default'] || is_null( $atts['default'] ) ) {
			$entry_results = array_filter( $entry_results, fn( $value ) => '' !== $value && ! is_null( $value ) );
		}
		if ( ! empty( $matches[0] ) ) {
			$display_format = wp_kses( $atts['display'], $allowed_tags );
			foreach ( $display_ids as $display_id ) {
				// Replace both {id} and {gfs:id} formats with the value
				// If the field was filtered out (because default was empty), use empty string
				$value          = $entry_results[ $display_id ] ?? '';
				$display_format = str_replace( '{' . $display_id . '}', $value, $display_format );
				$display_format = str_replace( '{gfs:' . $display_id . '}', $value, $display_format );
			}
			$result_text = $display_format;
			if ( $atts['link'] ) {
				$result_text = '<a target="_blank" href="' . admin_url( 'admin.php?page=gf_entries&view=entry&id=' . $entry['form_id'] . '&lid=' . $entry['id'] ) . '">' . $result_text . '</a>';
			}
			$results[] = $result_text;
		} else {
			$result_text = implode( ', ', $entry_results );
			if ( $atts['link'] ) {
				$result_text = '<a target="_blank"  href="' . admin_url( 'admin.php?page=gf_entries&view=entry&id=' . $entry['form_id'] . '&lid=' . $entry['id'] ) . '">' . $result_text . '</a>';
			}
			$results[] = $result_text;
		}
	}

	if ( $atts['unique'] ) {
		$results = array_unique( $results );
	}

	$results = array_map( 'trim', $results );
	$results = array_filter( $results, fn( $value ) => '' !== $value && ! is_null( $value ) );

	if ( empty( $results ) ) {
		return wp_kses_post( $atts['default'] );
	}

	if ( empty( $atts['separator'] ) ) {
		$separator = ( count( $display_ids ) > 1 || $multi_input_present ) ? '; ' : ', ';
	} else {
		$separator = wp_kses_post( $atts['separator'] );
	}

	return wp_kses( implode( $separator, $results ), $allowed_tags );
}

/**
 * Determines if a given field is a multi-input field.
 *
 * @param mixed $field The field configuration array. Expected to contain 'type' and optionally 'inputType' keys.
 *
 * @return bool True if the field is a multi-input field, false otherwise.
 */
function is_multi_input_field( $field ): bool {
	return 'name' === $field['type'] || 'address' === $field['type'] || 'checkbox' === $field['type'] || ( ( 'image_choice' === $field['type'] || 'multi_choice' === $field['type'] ) && 'checkbox' === $field['inputType'] );
}