<?php

namespace App\Services\Auth;

use App\Models\ManagedEnvironment;
use App\Models\User;
use App\Support\Auth\Capabilities;
use App\Support\Auth\WorkspaceRole;
use Illuminate\Support\Facades\Log;

/**
 * Capability Resolver
 *
 * Resolves user memberships and capabilities for a given tenant.
 * Caches results per request to avoid N+1 queries.
 */
class CapabilityResolver
{
    private array $loggedDenials = [];

    public function __construct(
        private readonly ManagedEnvironmentAccessScopeResolver $accessScopeResolver,
    ) {}

    /**
     * Get the user's role for a tenant
     */
    public function getRole(User $user, ManagedEnvironment $tenant): ?WorkspaceRole
    {
        $decision = $this->accessScopeResolver->decision($user, $tenant);

        if (! $decision->workspaceMember || $decision->workspaceRole === null) {
            return null;
        }

        return WorkspaceRole::tryFrom($decision->workspaceRole);
    }

    /**
     * Check if user can perform a capability on a tenant
     */
    public function can(User $user, ManagedEnvironment $tenant, string $capability): bool
    {
        if (! Capabilities::isKnown($capability)) {
            throw new \InvalidArgumentException("Unknown capability: {$capability}");
        }

        $decision = $this->accessScopeResolver->decision($user, $tenant, $capability);

        if (! $decision->workspaceMember || ! $decision->managedEnvironmentAllowed) {
            $this->logDenial($user, $tenant, $capability, $decision->failedBoundary);

            return false;
        }

        if ($this->isLocallyDeniedByBackupHealthBrowserFixture($user, $tenant, $capability)) {
            $this->logDenial($user, $tenant, $capability, 'capability');

            return false;
        }

        if (! $decision->capabilityAllowed) {
            $this->logDenial($user, $tenant, $capability, $decision->failedBoundary);
        }

        return $decision->capabilityAllowed;
    }

    private function isLocallyDeniedByBackupHealthBrowserFixture(User $user, ManagedEnvironment $tenant, string $capability): bool
    {
        if (! app()->environment(['local', 'testing'])) {
            return false;
        }

        $fixture = config('tenantpilot.backup_health.browser_smoke_fixture.blocked_drillthrough');

        if (! is_array($fixture)) {
            return false;
        }

        $fixtureUserEmail = config('tenantpilot.backup_health.browser_smoke_fixture.user.email');

        if (! is_string($fixtureUserEmail) || $fixtureUserEmail === '' || $user->email !== $fixtureUserEmail) {
            return false;
        }

        $fixtureTenantExternalId = $fixture['tenant_external_id'] ?? null;

        if (! is_string($fixtureTenantExternalId) || $fixtureTenantExternalId === '' || $tenant->external_id !== $fixtureTenantExternalId) {
            return false;
        }

        $deniedCapabilities = $fixture['capability_denials'] ?? [];

        if (! is_array($deniedCapabilities)) {
            return false;
        }

        return in_array($capability, $deniedCapabilities, true);
    }

    private function logDenial(User $user, ManagedEnvironment $tenant, string $capability, ?string $failedBoundary = null): void
    {
        $key = implode(':', [(string) $user->getKey(), (string) $tenant->getKey(), $capability]);

        if (isset($this->loggedDenials[$key])) {
            return;
        }

        $this->loggedDenials[$key] = true;

        Log::warning('rbac.denied', [
            'capability' => $capability,
            'failed_boundary' => $failedBoundary,
            'workspace_id' => is_numeric($tenant->workspace_id) ? (int) $tenant->workspace_id : null,
            'managed_environment_id' => (int) $tenant->getKey(),
            'actor_user_id' => (int) $user->getKey(),
        ]);
    }

    /**
     * Check if user has any membership for a tenant
     */
    public function isMember(User $user, ManagedEnvironment $tenant): bool
    {
        return $this->accessScopeResolver->canAccess($user, $tenant);
    }

    /**
     * Prime workspace membership and managed-environment scope cache for a set of tenants.
     *
     * Used to avoid N+1 queries for bulk selection authorization while still
     * reflecting membership changes that may have happened earlier in the same
     * request or test process.
     *
     * @param  array<int, int|string>  $tenantIds
     */
    public function primeMemberships(User $user, array $tenantIds): void
    {
        $this->accessScopeResolver->prime($user, $tenantIds);
    }

    /**
     * Clear cached memberships (useful for testing or after membership changes)
     */
    public function clearCache(): void
    {
        $this->accessScopeResolver->clearCache();
    }
}
