<?php
/**
 * Requirement Functions
 *
 * @package     GamiPress\Requirement_Functions
 * @author      GamiPress <contact@gamipress.com>, Ruben Garcia <rubengcdev@gmail.com>
 * @since       1.0.5
 */
// Exit if accessed directly
if( !defined( 'ABSPATH' ) ) exit;

/**
 * Check if post is a registered GamiPress requirement.
 *
 * @since  1.3.0
 *
 * @param  object|int $post Post object or ID.
 * @return bool             True if post is an requirement, otherwise false.
 */
function gamipress_is_requirement( $post = null ) {

    // Assume we are working with a requirement object
    $return = true;

    // If post type is NOT a registered requirement type, it cannot be a requirement
    if ( ! in_array( gamipress_get_post_type( $post ), gamipress_get_requirement_types_slugs() ) ) {
        $return = false;
    }

    // If we pass both previous tests, this is a valid requirement (with filter to override)
    return apply_filters( 'gamipress_is_requirement', $return, $post );
}


/**
 * Get GamiPress Requirement Types
 *
 * Returns a multidimensional array of slug, single name and plural name for all requirement types.
 *
 * @since  1.0.5
 *
 * @return array An array of our registered requirement types
 */
function gamipress_get_requirement_types() {

    return GamiPress()->requirement_types;

}

/**
 * Get GamiPress Requirement Type Slugs
 *
 * @since  1.0.5
 *
 * @return array An array of all our registered requirement type slugs (empty array if none)
 */
function gamipress_get_requirement_types_slugs() {

    // Assume we have no registered requirement types
    $requirement_type_slugs = array();

    // If we do have any requirement types, loop through each and add their slug to our array
    foreach ( GamiPress()->requirement_types as $slug => $data ) {
        $requirement_type_slugs[] = $slug;
    }

    // Finally, return our data
    return $requirement_type_slugs;

}

/**
 * Build a requirement object
 *
 * @since   1.0.5
 * @updated 1.5.1 Added the order key (based on menu_order)
 *
 * @param int $requirement_id
 *
 * @return array
 */
function gamipress_get_requirement_object( $requirement_id = 0 ) {

    $requirement_type = gamipress_get_post_type( $requirement_id );

    // Setup our default requirements array, assume we require nothing
    $requirement = array(
        'ID'                        => $requirement_id,
        'title'                     => gamipress_get_post_field( 'post_title', $requirement_id ),
        'order'                     => gamipress_get_post_field( 'menu_order', $requirement_id ),
        'count'                     => absint( gamipress_get_post_meta( $requirement_id, '_gamipress_count' ) ),
        'limit'                     => absint( gamipress_get_post_meta( $requirement_id, '_gamipress_limit' ) ),
        'limit_type'                => gamipress_get_post_meta( $requirement_id, '_gamipress_limit_type' ),
        'trigger_type'              => gamipress_get_post_meta( $requirement_id, '_gamipress_trigger_type' ),
        'optional'                  => (bool) gamipress_get_post_meta( $requirement_id, '_gamipress_optional' ),
        'url'                       => gamipress_get_post_meta( $requirement_id, '_gamipress_url' ),
        // Points vars
        'points_condition'          => gamipress_get_post_meta( $requirement_id, '_gamipress_points_condition' ),
        'points_required'           => absint( gamipress_get_post_meta( $requirement_id, '_gamipress_points_required' ) ),
        'points_type_required'      => gamipress_get_post_meta( $requirement_id, '_gamipress_points_type_required' ),
        // Rank vars
        'rank_required'             => absint( gamipress_get_post_meta( $requirement_id, '_gamipress_rank_required' ) ),
        'rank_type_required'        => gamipress_get_post_meta( $requirement_id, '_gamipress_rank_type_required' ),
        // Post type vars
        'post_type_required'        => gamipress_get_post_meta( $requirement_id, '_gamipress_post_type_required' ),
        // User role vars
        'user_role_required'        => gamipress_get_post_meta( $requirement_id, '_gamipress_user_role_required' ),
        // Achievement vars
        'achievement_type'          => gamipress_get_post_meta( $requirement_id, '_gamipress_achievement_type' ),
        'achievement_post'          => absint( gamipress_get_post_meta( $requirement_id, '_gamipress_achievement_post' ) ),
        'achievement_post_site_id'  => get_current_blog_id(),
        // Meta vars
        'meta_key_required'         => gamipress_get_post_meta( $requirement_id, '_gamipress_meta_key_required' ),
        'meta_value_required'       => gamipress_get_post_meta( $requirement_id, '_gamipress_meta_value_required' ),
    );

    // Initialize points condition for backward compatibility
    if( empty( $requirement['points_condition'] ) ) {
        $requirement['points_condition'] = 'greater_or_equal';
    }

    // Specific points award/deduct data
    if( $requirement_type === 'points-award' || $requirement_type === 'points-deduct' ) {
        $requirement['points']              = absint( gamipress_get_post_meta( $requirement_id, '_gamipress_points' ) );
        $requirement['points_type']         = gamipress_get_post_meta( $requirement_id, '_gamipress_points_type' );
        $requirement['maximum_earnings']    = gamipress_get_post_meta( $requirement_id, '_gamipress_maximum_earnings' );

        if( $requirement['maximum_earnings'] === '' ) {
            $requirement['maximum_earnings'] = 0;
        } else {
            $requirement['maximum_earnings'] = absint( $requirement['maximum_earnings'] );
        }
    }

    // Check the achievement post site ID
    if ( in_array( $requirement['trigger_type'], array_keys( gamipress_get_specific_activity_triggers() ) ) ) {

        if ( $requirement['achievement_post'] > 0  ) {

            $achievement_post_site_id = gamipress_get_post_meta( $requirement_id, '_gamipress_achievement_post_site_id' );

            if( ! empty( $achievement_post_site_id ) ) {
                $requirement['achievement_post_site_id'] = absint( $achievement_post_site_id );
            }
        }

    }

    // Available filter for overriding elsewhere
    return apply_filters( 'gamipress_requirement_object', $requirement, $requirement_id );

}

/**
 * Helper function to query requirements
 *
 * @since 1.8.8
 *
 * @param array $query_args
 *
 * @return array|object|null
 */
function gamipress_query_requirements( $query_args = array() ) {

    $query_args = wp_parse_args( $query_args, array(
        'fields'        => 'all',
        'post_status'   => 'publish',
        'meta_query'    => array(),
    ) );

    global $wpdb;

    $posts      = GamiPress()->db->posts;
    $postmeta   = GamiPress()->db->postmeta;

    // SELECT
    $select = 'SELECT *';

    // Setup fields to return
    if( $query_args['fields'] === 'ids' ) {
        $select = 'SELECT p.ID';
    }

    // FROM
    $from = array( "FROM {$posts} AS p" );

    // WHERE
    $where = array( '1=1' );

    // Post type
    $requirement_types = gamipress_get_requirement_types_slugs();
    $where[] = "p.post_type IN ( '" . implode( "', '", $requirement_types ) . "' )";

    // Post status
    $where[] = "p.post_status = '" . $query_args['post_status'] . "'";

    // Meta query
    if( is_array( $query_args['meta_query'] ) && ! empty( $query_args['meta_query'] ) ) {

        $i = 1;

        foreach ( $query_args['meta_query'] as $meta_key => $meta_value ) {

            $meta_key = sanitize_text_field( $meta_key );

            $from[] = "LEFT JOIN {$postmeta} AS pm{$i} ON ( p.ID = pm{$i}.post_id AND pm{$i}.meta_key = '{$meta_key}' )";

            // Check for array meta values
            if( is_array( $meta_value ) ) {

                foreach( $meta_value as $k => $value ) {
                    $meta_value[$k] = sanitize_text_field( $value );
                }

                $where[] = "pm{$i}.meta_value IN ( '" . implode( "', '", $meta_value ) . "' )";

            } else {
                $meta_value = sanitize_text_field( $meta_value );

                $where[] = "pm{$i}.meta_value = '{$meta_value}'";
            }



            $i++;

        }

    }

    // ORDER BY
    $order_by = array( "p.menu_order ASC" );

    // Setup vars
    $from = implode( ' ', $from );
    $where = "WHERE " . implode( ' AND ', $where );
    $order_by = "ORDER BY " . implode( ', ', $order_by );

    // Get all requirements with this trigger and post assigned
    $results = $wpdb->get_results( "{$select} {$from} {$where} {$order_by}" );

    return $results;

}

/**
 * Helper function to determine if user is able to earn a requirement
 *
 * @since 1.9.0
 *
 * @param int $requirement_id   The requirement ID
 * @param int $user_id          The user ID
 *
 * @return bool
 */
function gamipress_can_user_earn_requirement( $requirement_id = 0, $user_id = 0 ) {

    if( $user_id === 0 ) {
        $user_id = get_current_user_id();
    }

    $post_type = gamipress_get_post_type( $requirement_id );
    $can_earn = false;

    switch( $post_type ) {
        case 'points-award':
        case 'points-deduct':
            $maximum_earnings = absint( gamipress_get_post_meta( $requirement_id, '_gamipress_maximum_earnings' ) );

            // An unlimited maximum of earnings means points deducts could be earned anyway
            if( $maximum_earnings > 0 ) {
                $earned_times = gamipress_get_earnings_count( array(
                    'user_id' => absint( $user_id ),
                    'post_id' => absint( $requirement_id ),
                ) );

                // User has earned it more times than required times, so is earned
                if( $earned_times < $maximum_earnings ) {
                    $can_earn = true;
                }
            } else {
                // If maximum earnings is unlimited, then can be earned
                $can_earn = true;
            }
            break;
        case 'step':
            $achievement = gamipress_get_step_achievement( $requirement_id );

            // First check if user has not exceeded the maximum earnings allowed for this achievement
            if( $achievement && ! gamipress_achievement_user_exceeded_max_earnings( $user_id, $achievement->ID ) ) {

                // Next, check if user has earned the step based on the last time he has completed the achievement
                if( gamipress_get_earnings_count( array(
                        'user_id'   => $user_id,
                        'post_id'   => $requirement_id,
                        'since'     => gamipress_achievement_last_user_activity( $achievement->ID, $user_id )
                    ) ) === 0 ) {
                    $can_earn = true;
                }

            }
            break;
        case 'rank-requirement':
            $rank = gamipress_get_rank_requirement_rank( $requirement_id );
            
            // First check if user has earned the rank
            if( $rank && ! gamipress_has_user_earned_achievement( $rank->ID, $user_id ) ) {

                // Next, check if has earned the rank requirement
                if( ! gamipress_has_user_earned_achievement( $requirement_id, $user_id ) ) {
                    $can_earn = true;
                }
            }
            break;
    }

    // Check if user deserves limit requirements for this requirement
    if( $can_earn ) {

        $trigger_type = gamipress_get_post_meta( $requirement_id, '_gamipress_trigger_type' );
        
        if( ! in_array( $trigger_type, gamipress_get_activity_triggers_excluded_from_activity_limit() ) ) {

            // Check if is limited over time
            $since = gamipress_get_achievement_limit_timestamp( $requirement_id );
            
            if( $since > 0 ) {

                // Activity count limit over time
                $count = absint( gamipress_get_post_meta( $requirement_id, '_gamipress_count' ) );
                
                // Activity count limited to a timestamp
                $activity_count = absint( gamipress_get_achievement_activity_count_limited( $user_id, $requirement_id, $since ) );
                
                // Force bail if user exceeds the limit over time
                if( $activity_count >= $count ) {
                    $can_earn = false;
                }

            }

        }

    }

    /**
     * Filter available to override if user is able to earn a requirement
     *
     * @since 1.9.0
     *
     * @param bool  $can_earn           If user can earn this requirement or not
     * @param int   $requirement_id     The requirement ID
     * @param int   $user_id            The user ID
     *
     * @return bool
     */
    return apply_filters( 'gamipress_can_user_earn_requirement', $can_earn, $requirement_id, $user_id );

}

/**
 * Get the reward requirements count
 *
 * @since 1.0.0
 *
 * @param integer   $post_id    The reward ID to check (achievement, rank or points type)
 * @param string    $post_type  The children post type (step, rank-requirement, points-award or points-deduct)
 *
 * @return integer
 */
function gamipress_get_reward_requirements_count( $post_id, $post_type = '' ) {

    global $wpdb;

    $post_id = absint( $post_id );

    // Bail if post ID not valid
    if( $post_id === 0 ) return 0;

    // Bail if post type is not a valid requirement type
    if( ! in_array( $post_type, gamipress_get_requirement_types_slugs() ) ) return 0;

    $cache = gamipress_get_cache( 'reward_requirement_count', array(), false );

    // If result already cached, return it
    if( isset( $cache[$post_id] ) && isset( $cache[$post_id][$post_type] ) ) {
        return absint( $cache[$post_id][$post_type] );
    }

    $posts_table = GamiPress()->db->posts;

    $count = absint( $wpdb->get_var(
        "SELECT COUNT(*) 
                FROM {$posts_table} 
                WHERE 1=1
                AND post_parent = '{$post_id}'
                AND post_type = '{$post_type}'
                AND post_status = 'publish'"
    ) );

    // Cache function result
    if( ! isset( $cache[$post_id] ) ){
        $cache[$post_id] = array();
    }

    $cache[$post_id][$post_type] = $count;

    gamipress_set_cache( 'reward_requirement_count', $cache );

    // Return requirements count
    return $count;

}

/**
 * Get the achievement steps count
 *
 * @since 1.0.0
 *
 * @param integer $achievement_id
 *
 * @return integer
 */
function gamipress_get_achievement_steps_count( $achievement_id ) {
    return gamipress_get_reward_requirements_count( $achievement_id, 'step' );
}

/**
 * Get the rank requirements count
 *
 * @since 1.0.0
 *
 * @param integer $rank_id
 *
 * @return integer
 */
function gamipress_get_rank_requirements_count( $rank_id ) {
    return gamipress_get_reward_requirements_count( $rank_id, 'rank-requirement' );
}

/**
 * Get the points awards count
 *
 * @since 1.0.0
 *
 * @param integer $points_type_id
 *
 * @return integer
 */
function gamipress_get_points_awards_count( $points_type_id ) {
    return gamipress_get_reward_requirements_count( $points_type_id, 'points-award' );
}

/**
 * Get the points deducts count
 *
 * @since 1.0.0
 *
 * @param integer $points_type_id
 *
 * @return integer
 */
function gamipress_get_points_deducts_count( $points_type_id ) {
    return gamipress_get_reward_requirements_count( $points_type_id, 'points-deduct' );
}