<?php
namespace WordPressDotOrg\FiveForTheFuture\XProfile;

use WordPressDotOrg\FiveForTheFuture\Contributor;
use wpdb;

/*
 * The IDs of the xprofile fields we need. Better to use the numerical IDs than the field labels,
 * because those are more likely to change.
 */
const FIELD_IDS = array(
	'sponsored'      => 24,
	'hours_per_week' => 29,
	'team_names'     => 30,
);

defined( 'WPINC' ) || die();

/**
 * Pull relevant data from profiles.wordpress.org.
 *
 * Note that this does not unserialize anything, it just pulls the raw values from the database table. If you
 * want unserialized data, use `prepare_xprofile_contribution_data()`.
 *
 * @global wpdb $wpdb
 *
 * @param array $user_ids
 *
 * @return array
 */
function get_xprofile_contribution_data( array $user_ids ) {
	global $wpdb;

	$sql = $wpdb->prepare( '
		SELECT user_id, field_id, value
		FROM bpmain_bp_xprofile_data
		WHERE user_id IN ( %1$s )
		AND field_id IN ( %2$s )',
		implode( ', ', array_map( 'absint', $user_ids ) ),
		implode( ', ', array_map( 'absint', array_values( FIELD_IDS ) ) )
	);

	return $wpdb->get_results( $sql, ARRAY_A ); // phpcs:ignore WordPress.DB.PreparedSQL -- prepare called above.
}

/**
 * Reindex the values by user ID, normalize it, and format it.
 *
 * This makes the data much easier to work with in many cases.
 *
 * @param array $raw_data
 *
 * @return array
 */
function prepare_xprofile_contribution_data( array $raw_data ) {
	$prepared_data     = array();
	$field_keys_by_id = array_flip( FIELD_IDS );

	foreach ( $raw_data as $datum ) {
		$user_id     = $datum['user_id'];
		$field_key   = $field_keys_by_id[ (int) $datum['field_id'] ];
		$field_value = maybe_unserialize( $datum['value'] );

		if ( ! isset( $prepared_data[ $user_id ]['sponsored'] ) ) {
			$prepared_data[ $user_id ]['sponsored'] = false;
		}

		if ( 'sponsored' === $field_key ) {
			$prepared_data[ $user_id ]['sponsored'] = 'Yes' === $field_value;
		} else {
			$prepared_data[ $user_id ][ $field_key ] = $field_value;
		}
	}

	return $prepared_data;
}

/**
 * Aggregate the raw xprofile data for all contributors linked to a given pledge.
 *
 * @param int $pledge_id
 *
 * @return array
 */
function get_aggregate_contributor_data_for_pledge( $pledge_id ) {
	$contributor_posts = Contributor\get_pledge_contributors( $pledge_id, 'publish' );

	// All of their contributors might have declined the invitation and had their posts deleted.
	if ( ! $contributor_posts ) {
		return array(
			'contributors' => 0,
			'hours'        => 0,
			'teams'        => array(),
		);
	}

	$contributor_users = Contributor\get_contributor_user_objects( $contributor_posts );
	$user_ids          = wp_list_pluck( $contributor_users, 'ID' );

	$data = get_xprofile_contribution_data( $user_ids );

	$initial = array(
		'contributors' => count( $user_ids ),
		'hours'        => 0,
		'teams'        => array(),
	);

	$aggregate_data = array_reduce( $data, function( $carry, $item ) {
		switch ( $item['field_id'] ) {
			case FIELD_IDS['hours_per_week']:
				$carry['hours'] += absint( $item['value'] );
				break;

			case FIELD_IDS['team_names']:
				$value          = (array) maybe_unserialize( $item['value'] );
				$carry['teams'] = array_merge( $carry['teams'], $value );
				break;
		}

		return $carry;
	}, $initial );

	$aggregate_data['teams'] = array_map(
		function( $team ) {
			// Fix for renamed team.
			if ( 'Theme Review Team' === $team ) {
				$team = 'Themes Team';
			}

			return $team;
		},
		$aggregate_data['teams']
	);
	$aggregate_data['teams'] = array_unique( $aggregate_data['teams'] );
	sort( $aggregate_data['teams'] );

	return $aggregate_data;
}

/**
 * Fetch the profile data for a specific user.
 *
 * @param int $user_id
 *
 * @return array
 */
function get_contributor_user_data( $user_id ) {
	$formatted_data = array();
	$raw_data       = get_xprofile_contribution_data( array( $user_id ) );

	$defaults = array(
		'hours_per_week' => 0,
		'team_names'     => array(),
	);

	foreach ( $raw_data as $datum ) {
		$key = array_search( $datum['field_id'], FIELD_IDS );

		switch ( $key ) {
			case 'hours_per_week':
				$formatted_data[ $key ] = absint( $datum['value'] );
				break;

			case 'team_names':
				$formatted_data[ $key ] = maybe_unserialize( $datum['value'] );
		}
	}

	$formatted_data = array_merge( $defaults, $formatted_data );

	return $formatted_data;
}