<?php
define('MSZ_FORUM_PERMS_GENERAL', 'forum');

define('MSZ_FORUM_PERM_MODES', [
    MSZ_FORUM_PERMS_GENERAL,
]);

function forum_perms_get_keys(): array
{
    $perms = [];

    foreach (MSZ_FORUM_PERM_MODES as $mode) {
        foreach (MSZ_PERM_SETS as $set) {
            $perms[] = perms_get_key($mode, $set);
        }
    }

    return $perms;
}

function forum_perms_create(): array
{
    $perms = [];

    foreach (forum_perms_get_keys() as $key) {
        $perms[$key] = 0;
    }

    return $perms;
}

function forum_perms_get_user_sql(
    string $prefix,
    string $forum_id_param = ':perm_forum_id',
    string $user_id_user_param = ':perm_user_id_user',
    string $user_id_role_param = ':perm_user_id_role'
): string {
    return sprintf(
        '
            SELECT BIT_OR(`%1$s_perms`)
            FROM `msz_forum_permissions_view`
            WHERE (`forum_id` = %2$s OR `forum_id` IS NULL)
            AND (
                (`user_id` IS NULL AND `role_id` IS NULL)
                OR (`user_id` = %3$s AND `role_id` IS NULL)
                OR (
                    `user_id` IS NULL
                    AND `role_id` IN (
                        SELECT `role_id`
                        FROM `msz_user_roles`
                        WHERE `user_id` = %4$s
                    )
                )
            )
        ',
        $prefix,
        $forum_id_param,
        $user_id_user_param,
        $user_id_role_param
    );
}

function forum_perms_get_user(string $prefix, int $forum, int $user): int
{
    if (!in_array($prefix, MSZ_FORUM_PERM_MODES) || $user < 0) {
        return 0;
    }

    $getPerms = db_prepare(forum_perms_get_user_sql($prefix));
    $getPerms->bindValue('perm_forum_id', $forum);
    $getPerms->bindValue('perm_user_id_user', $user);
    $getPerms->bindValue('perm_user_id_role', $user);
    return $getPerms->execute() ? (int)$getPerms->fetchColumn() : 0;
}

function forum_perms_get_role(string $prefix, int $forum, int $role): int
{
    if (!in_array($prefix, MSZ_FORUM_PERM_MODES) || $role < 1) {
        return 0;
    }

    $getPerms = db_prepare("
        SELECT BIT_OR(`{$prefix}_perms`)
        FROM `msz_forum_permissions_view`
        WHERE (`forum_id` = :forum_id OR `forum_id` IS NULL)
        AND `role_id` = :role_id
        AND `user_id` IS NULL
    ");
    $getPerms->bindValue('forum_id', $forum);
    $getPerms->bindValue('role_id', $role);
    return $getPerms->execute() ? (int)$getPerms->fetchColumn() : 0;
}

function forum_perms_get_user_raw(?int $forum, int $user): array
{
    if ($user < 1) {
        return forum_perms_create();
    }

    $getPerms = db_prepare(sprintf('
        SELECT
            `' . implode('`, `', forum_perms_get_keys()) . '`
        FROM `msz_forum_permissions`
        WHERE `forum_id` %s
        AND `user_id` = :user_id
        AND `role_id` IS NULL
    ', $forum === null ? 'IS NULL' : '= :forum_id'));

    if ($forum !== null) {
        $getPerms->bindValue('forum_id', $forum);
    }

    $getPerms->bindValue('user_id', $user);
    $perms = db_fetch($getPerms);

    if (empty($perms)) {
        return forum_perms_create();
    }

    return $perms;
}

function forum_perms_get_role_raw(?int $forum, ?int $role): array
{
    if ($role < 1 && $role !== null) {
        return forum_perms_create();
    }

    $getPerms = db_prepare(sprintf(
        '
            SELECT
                `' . implode('`, `', forum_perms_get_keys()) . '`
            FROM `msz_forum_permissions`
            WHERE `forum_id` %s
            AND `user_id` IS NULL
            AND `role_id` %s
        ',
        $forum === null ? 'IS NULL' : '= :forum_id',
        $role === null ? 'IS NULL' : '= :role_id'
    ));

    if ($forum !== null) {
        $getPerms->bindValue('forum_id', $forum);
    }

    if ($role !== null) {
        $getPerms->bindValue('role_id', $role);
    }

    $perms = db_fetch($getPerms);

    if (empty($perms)) {
        return forum_perms_create();
    }

    return $perms;
}