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

define('MSZ_FORUM_PERM_LIST_FORUM', 0x00000001); // can see stats, but will get error when trying to view
define('MSZ_FORUM_PERM_VIEW_FORUM', 0x00000002);

define('MSZ_FORUM_PERM_CREATE_TOPIC',           0x00000400);
//define('MSZ_FORUM_PERM_DELETE_TOPIC',         0x00000800); // use MSZ_FORUM_PERM_DELETE_ANY_POST instead
define('MSZ_FORUM_PERM_MOVE_TOPIC',             0x00001000);
define('MSZ_FORUM_PERM_LOCK_TOPIC',             0x00002000);
define('MSZ_FORUM_PERM_STICKY_TOPIC',           0x00004000);
define('MSZ_FORUM_PERM_ANNOUNCE_TOPIC',         0x00008000);
define('MSZ_FORUM_PERM_GLOBAL_ANNOUNCE_TOPIC',  0x00010000);
define('MSZ_FORUM_PERM_BUMP_TOPIC',             0x00020000);
//define('MSZ_FORUM_PERM_PRIORITY_VOTE',        0x00040000); // feature postponed, perhaps reuse if it makes sense to

define('MSZ_FORUM_PERM_CREATE_POST',     0x00100000);
define('MSZ_FORUM_PERM_EDIT_POST',       0x00200000);
define('MSZ_FORUM_PERM_EDIT_ANY_POST',   0x00400000);
define('MSZ_FORUM_PERM_DELETE_POST',     0x00800000);
define('MSZ_FORUM_PERM_DELETE_ANY_POST', 0x01000000);

// shorthands, never use these to SET!!!!!!!
define('MSZ_FORUM_PERM_SET_READ', MSZ_FORUM_PERM_LIST_FORUM | MSZ_FORUM_PERM_VIEW_FORUM);
define(
    'MSZ_FORUM_PERM_SET_WRITE',
    MSZ_FORUM_PERM_CREATE_TOPIC
    | MSZ_FORUM_PERM_MOVE_TOPIC
    | MSZ_FORUM_PERM_LOCK_TOPIC
    | MSZ_FORUM_PERM_STICKY_TOPIC
    | MSZ_FORUM_PERM_ANNOUNCE_TOPIC
    | MSZ_FORUM_PERM_GLOBAL_ANNOUNCE_TOPIC
    | MSZ_FORUM_PERM_CREATE_POST
    | MSZ_FORUM_PERM_EDIT_POST
    | MSZ_FORUM_PERM_EDIT_ANY_POST
    | MSZ_FORUM_PERM_DELETE_POST
    | MSZ_FORUM_PERM_DELETE_ANY_POST
    | MSZ_FORUM_PERM_BUMP_TOPIC
);

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

function forum_perms_get_user(?int $forum, int $user): array {
    $perms = perms_get_blank(MSZ_FORUM_PERM_MODES);

    if($user < 0 || $forum < 0) {
        return $perms;
    }

    static $memo = [];
    $memoId = "{$forum}-{$user}";

    if(array_key_exists($memoId, $memo)) {
        return $memo[$memoId];
    }

    if($forum > 0) {
        $perms = forum_perms_get_user(
            forum_get_parent_id($forum),
            $user
        );
    }

    $getPerms = \Misuzu\DB::prepare(sprintf(
        '
            SELECT %s
            FROM `msz_forum_permissions`
            WHERE (`forum_id` = :forum_id OR `forum_id` IS NULL)
            AND (
                (`user_id` IS NULL AND `role_id` IS NULL)
                OR (`user_id` = :user_id_1 AND `role_id` IS NULL)
                OR (
                    `user_id` IS NULL
                    AND `role_id` IN (
                        SELECT `role_id`
                        FROM `msz_user_roles`
                        WHERE `user_id` = :user_id_2
                    )
                )
            )
        ',
        perms_get_select(MSZ_FORUM_PERM_MODES)
    ));
    $getPerms->bind('forum_id', $forum);
    $getPerms->bind('user_id_1', $user);
    $getPerms->bind('user_id_2', $user);

    $userPerms = $getPerms->fetch();
    foreach($perms as $key => $value)
        $perms[$key] |= $userPerms[$key] ?? 0;

    return $memo[$memoId] = $perms;
}

function forum_perms_get_role(?int $forum, int $role): array {
    $perms = perms_get_blank(MSZ_FORUM_PERM_MODES);

    if($role < 1 || $forum < 0) {
        return $perms;
    }

    static $memo = [];
    $memoId = "{$forum}-{$role}";

    if(array_key_exists($memoId, $memo)) {
        return $memo[$memoId];
    }

    if($forum > 0) {
        $perms = forum_perms_get_role(
            forum_get_parent_id($forum),
            $role
        );
    }

    $getPerms = \Misuzu\DB::prepare(sprintf(
        '
            SELECT %s
            FROM `msz_forum_permissions`
            WHERE (`forum_id` = :forum_id OR `forum_id` IS NULL)
            AND `role_id` = :role_id
            AND `user_id` IS NULL
        ',
        perms_get_select(MSZ_FORUM_PERM_MODES)
    ));
    $getPerms->bind('forum_id', $forum);
    $getPerms->bind('role_id', $role);

    $userPerms = $getPerms->fetch();
    foreach($perms as $key => $value)
        $perms[$key] |= $userPerms[$key] ?? 0;

    return $memo[$memoId] = $perms;
}

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

    $getPerms = \Misuzu\DB::prepare(sprintf(
        '
            SELECT `%s`
            FROM `msz_forum_permissions`
            WHERE `forum_id` %s
            AND `user_id` = :user_id
            AND `role_id` IS NULL
        ',
        implode('`, `', perms_get_keys(MSZ_FORUM_PERM_MODES)),
        $forum === null ? 'IS NULL' : '= :forum_id'
    ));

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

    $getPerms->bind('user_id', $user);
    $perms = $getPerms->fetch();

    if(empty($perms)) {
        return perms_create(MSZ_FORUM_PERM_MODES);
    }

    return $perms;
}

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

    $getPerms = \Misuzu\DB::prepare(sprintf(
        '
            SELECT `%s`
            FROM `msz_forum_permissions`
            WHERE `forum_id` %s
            AND `user_id` IS NULL
            AND `role_id` %s
        ',
        implode('`, `', perms_get_keys(MSZ_FORUM_PERM_MODES)),
        $forum === null ? 'IS NULL' : '= :forum_id',
        $role === null ? 'IS NULL' : '= :role_id'
    ));

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

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

    $perms = $getPerms->fetch();

    if(empty($perms)) {
        return perms_create(MSZ_FORUM_PERM_MODES);
    }

    return $perms;
}

function forum_perms_check_user(
    string $prefix,
    ?int $forumId,
    ?int $userId,
    int $perm,
    bool $strict = false
): bool {
    return perms_check(forum_perms_get_user($forumId, $userId)[$prefix] ?? 0, $perm, $strict);
}