<?php

namespace app\service;

use app\model\Role;
use app\model\User;
use app\service\DepartmentService as DeptSvc;
use app\service\PermissionCatalog;

class AdminScopeService
{
    public static function permissions(array $authUser): array
    {
        $perms = $authUser['role_permissions'] ?? [];
        if (!is_array($perms)) {
            $perms = [];
        }

        return PermissionCatalog::normalize($perms);
    }

    public static function hasPermission(array $authUser, string $key): bool
    {
        $perms = self::permissions($authUser);

        // 超级管理员 / 旧 admin 角色：全部放行
        if (($authUser['role'] ?? '') === 'admin' && empty($authUser['role_id'])) {
            return true;
        }
        if (($authUser['role_slug'] ?? '') === 'super_admin') {
            return true;
        }

        return PermissionCatalog::hasCode($perms, $key);
    }

    public static function hasAny(array $authUser, array $keys): bool
    {
        foreach ($keys as $key) {
            if (self::hasPermission($authUser, $key)) {
                return true;
            }
        }

        return false;
    }

    public static function canAccessAdmin(array $authUser): bool
    {
        if (($authUser['role'] ?? '') === 'admin') {
            return true;
        }

        return self::hasPermission($authUser, 'can_access_admin');
    }

    public static function requirePermission(array $authUser, string $key): void
    {
        if (!self::hasPermission($authUser, $key)) {
            throw new \think\exception\HttpResponseException(json([
                'code'    => 1,
                'message' => '无操作权限',
                'data'    => null,
            ], 403));
        }
    }

    public static function requireAny(array $authUser, array $keys): void
    {
        if (!self::hasAny($authUser, $keys)) {
            throw new \think\exception\HttpResponseException(json([
                'code'    => 1,
                'message' => '无操作权限',
                'data'    => null,
            ], 403));
        }
    }

    /**
     * @return int[]|null null 表示可见全部用户
     */
    public static function visibleUserIds(array $authUser): ?array
    {
        if (self::hasPermission($authUser, 'btn:conv:view_all')
            || self::hasPermission($authUser, 'can_view_all_conversations')) {
            return null;
        }

        if (self::hasPermission($authUser, 'btn:conv:view_subordinate')
            || self::hasPermission($authUser, 'can_view_subordinate_conversations')) {
            $departmentId = (int) ($authUser['department_id'] ?? 0);
            if ($departmentId <= 0) {
                return [(int) $authUser['id']];
            }

            $deptIds = DeptSvc::descendantIds($departmentId);
            $userIds = DeptSvc::userIdsInDepartments($deptIds);

            return array_values(array_unique(array_map('intval', $userIds)));
        }

        if (($authUser['role'] ?? '') === 'admin') {
            return null;
        }

        return [(int) $authUser['id']];
    }

    public static function canViewUser(array $authUser, int $targetUserId): bool
    {
        $visible = self::visibleUserIds($authUser);
        if ($visible === null) {
            return true;
        }

        return in_array($targetUserId, $visible, true);
    }

    public static function canViewConversation(array $authUser, int $conversationUserId): bool
    {
        return self::canViewUser($authUser, $conversationUserId);
    }

    public static function applyUserScope($query, array $authUser, string $alias = 'u')
    {
        $visible = self::visibleUserIds($authUser);
        if ($visible !== null) {
            $query->whereIn("{$alias}.id", $visible ?: [0]);
        }

        return $query;
    }

    public static function applyConversationScope($query, array $authUser, string $conversationAlias = 'c')
    {
        $visible = self::visibleUserIds($authUser);
        if ($visible !== null) {
            $query->whereIn("{$conversationAlias}.user_id", $visible ?: [0]);
        }

        return $query;
    }

    public static function syncLegacyRoleField(int $userId, ?int $roleId): void
    {
        if (!$roleId) {
            return;
        }

        $role = Role::find($roleId);
        if (!$role) {
            return;
        }

        $permissions = PermissionCatalog::normalize($role->permissions ?? []);
        $legacyRole = !empty($permissions['can_access_admin']) ? 'admin' : 'user';
        User::where('id', $userId)->update(['role' => $legacyRole]);
    }
}