<?php

namespace MintyPHP\Service\Access;

use MintyPHP\Service\Tenant\TenantScopeService;

class TenantAuthorizationPolicy implements AuthorizationPolicyInterface
{
    use AuthorizationPolicyContextTrait;

    public const ABILITY_ADMIN_TENANTS_VIEW = 'admin.tenants.view';
    public const ABILITY_ADMIN_TENANTS_CREATE = 'admin.tenants.create';
    public const ABILITY_ADMIN_TENANTS_EDIT_CONTEXT = 'admin.tenants.edit.context';
    public const ABILITY_ADMIN_TENANTS_EDIT_SUBMIT = 'admin.tenants.edit.submit';
    public const ABILITY_ADMIN_TENANTS_DELETE = 'admin.tenants.delete';
    public const ABILITY_ADMIN_TENANTS_CUSTOM_FIELDS_MANAGE = 'admin.tenants.custom_fields.manage';
    public const ABILITY_ADMIN_TENANTS_AVATAR_VIEW = 'admin.tenants.avatar.view';
    public const ABILITY_ADMIN_TENANTS_MEDIA_UPDATE = 'admin.tenants.media.update';

    public function __construct(
        private readonly PermissionService $permissionService,
        private readonly TenantScopeService $scopeGateway
    ) {
    }

    public function supports(string $ability): bool
    {
        return in_array($ability, [
            self::ABILITY_ADMIN_TENANTS_VIEW,
            self::ABILITY_ADMIN_TENANTS_CREATE,
            self::ABILITY_ADMIN_TENANTS_EDIT_CONTEXT,
            self::ABILITY_ADMIN_TENANTS_EDIT_SUBMIT,
            self::ABILITY_ADMIN_TENANTS_DELETE,
            self::ABILITY_ADMIN_TENANTS_CUSTOM_FIELDS_MANAGE,
            self::ABILITY_ADMIN_TENANTS_AVATAR_VIEW,
            self::ABILITY_ADMIN_TENANTS_MEDIA_UPDATE,
        ], true);
    }

    public function authorize(string $ability, array $context = []): AuthorizationDecision
    {
        return match ($ability) {
            self::ABILITY_ADMIN_TENANTS_VIEW => $this->authorizeAdminTenantsView($context),
            self::ABILITY_ADMIN_TENANTS_CREATE => $this->authorizeAdminTenantsCreate($context),
            self::ABILITY_ADMIN_TENANTS_EDIT_CONTEXT => $this->authorizeAdminTenantsEditContext($context),
            self::ABILITY_ADMIN_TENANTS_EDIT_SUBMIT => $this->authorizeAdminTenantsEditSubmit($context),
            self::ABILITY_ADMIN_TENANTS_DELETE => $this->authorizeAdminTenantsDelete($context),
            self::ABILITY_ADMIN_TENANTS_CUSTOM_FIELDS_MANAGE => $this->authorizeAdminTenantCustomFieldsManage($context),
            self::ABILITY_ADMIN_TENANTS_AVATAR_VIEW => $this->authorizeAdminTenantAvatarView($context),
            self::ABILITY_ADMIN_TENANTS_MEDIA_UPDATE => $this->authorizeAdminTenantMediaUpdate($context),
            default => AuthorizationDecision::deny(500, 'authorization_ability_not_supported'),
        };
    }

    private function authorizeAdminTenantsEditContext(array $context): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        $targetTenantId = $this->targetTenantId($context);
        if ($actorUserId <= 0 || $targetTenantId <= 0) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        if (!$this->scopeGateway->canAccess('tenants', $targetTenantId, $actorUserId)) {
            return AuthorizationDecision::deny(403, 'permission_denied');
        }

        $canViewTenant = $this->hasPermission($actorUserId, PermissionService::TENANTS_VIEW);
        $canUpdateTenant = $this->hasPermission($actorUserId, PermissionService::TENANTS_UPDATE);
        $canViewPage = $canViewTenant || $canUpdateTenant;
        if (!$canViewPage) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        $capabilities = [
            'can_view_page' => $canViewPage,
            'can_update_tenant' => $canUpdateTenant,
            'can_manage_custom_fields' => $this->hasPermission($actorUserId, PermissionService::CUSTOM_FIELDS_MANAGE),
            'can_manage_sso' => $this->hasPermission($actorUserId, PermissionService::TENANTS_SSO_MANAGE),
            'can_delete_tenant' => $this->hasPermission($actorUserId, PermissionService::TENANTS_DELETE),
        ];

        return AuthorizationDecision::allow(['capabilities' => $capabilities]);
    }

    private function authorizeAdminTenantsView(array $context): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        if (!$this->hasPermission($actorUserId, PermissionService::TENANTS_VIEW)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        return AuthorizationDecision::allow([
            'capabilities' => [
                'can_view_page' => true,
                'can_create_tenant' => $this->hasPermission($actorUserId, PermissionService::TENANTS_CREATE),
                'can_manage_custom_fields' => $this->hasPermission($actorUserId, PermissionService::CUSTOM_FIELDS_MANAGE),
                'can_manage_sso' => $this->hasPermission($actorUserId, PermissionService::TENANTS_SSO_MANAGE),
                'allowed_tenant_ids' => $this->scopeGateway->getUserTenantIds($actorUserId),
                'is_strict_scope' => $this->scopeGateway->isStrict(),
                'has_global_access' => $this->scopeGateway->hasGlobalAccess($actorUserId),
            ],
        ]);
    }

    private function authorizeAdminTenantsCreate(array $context): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        if (!$this->hasPermission($actorUserId, PermissionService::TENANTS_CREATE)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        return AuthorizationDecision::allow([
            'capabilities' => [
                'can_manage_custom_fields' => $this->hasPermission($actorUserId, PermissionService::CUSTOM_FIELDS_MANAGE),
                'can_manage_sso' => $this->hasPermission($actorUserId, PermissionService::TENANTS_SSO_MANAGE),
            ],
        ]);
    }

    private function authorizeAdminTenantsEditSubmit(array $context): AuthorizationDecision
    {
        $contextDecision = $this->authorizeAdminTenantsEditContext($context);
        if (!$contextDecision->isAllowed()) {
            return $contextDecision;
        }

        $capabilities = $this->capabilitiesFromDecision($contextDecision);
        if (!($capabilities['can_update_tenant'] ?? false)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        $input = is_array($context['input'] ?? null) ? $context['input'] : [];
        if ($this->containsSsoFields($input) && !($capabilities['can_manage_sso'] ?? false)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        return AuthorizationDecision::allow(['capabilities' => $capabilities]);
    }

    private function authorizeAdminTenantsDelete(array $context): AuthorizationDecision
    {
        return $this->authorizeTenantWithPermission($context, PermissionService::TENANTS_DELETE);
    }

    private function authorizeAdminTenantCustomFieldsManage(array $context): AuthorizationDecision
    {
        return $this->authorizeTenantWithPermission($context, PermissionService::CUSTOM_FIELDS_MANAGE);
    }

    private function authorizeAdminTenantAvatarView(array $context): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        if (!$this->hasPermission($actorUserId, PermissionService::TENANTS_VIEW)
            && !$this->hasPermission($actorUserId, PermissionService::TENANTS_UPDATE)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        return $this->authorizeTenantScopeOnly($context);
    }

    private function authorizeAdminTenantMediaUpdate(array $context): AuthorizationDecision
    {
        return $this->authorizeTenantWithPermission($context, PermissionService::TENANTS_UPDATE);
    }

    private function authorizeTenantWithPermission(array $context, string $permissionKey): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        if (!$this->hasPermission($actorUserId, $permissionKey)) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        return $this->authorizeTenantScopeOnly($context);
    }

    private function authorizeTenantScopeOnly(array $context): AuthorizationDecision
    {
        $actorUserId = $this->actorUserId($context);
        $targetTenantId = $this->targetTenantId($context);
        if ($actorUserId <= 0 || $targetTenantId <= 0) {
            return AuthorizationDecision::deny(403, 'forbidden');
        }

        if (!$this->scopeGateway->canAccess('tenants', $targetTenantId, $actorUserId)) {
            return AuthorizationDecision::deny(403, 'permission_denied');
        }

        return AuthorizationDecision::allow();
    }

    private function containsSsoFields(array $input): bool
    {
        $ssoFields = [
            'microsoft_enabled',
            'enforce_microsoft_login',
            'sync_profile_on_login',
            'sync_profile_fields',
            'entra_tenant_id',
            'allowed_domains',
            'use_shared_app',
            'client_id_override',
            'client_secret_override',
            'clear_client_secret_override',
            'microsoft_auto_remember_mode',
        ];

        foreach ($ssoFields as $field) {
            if (array_key_exists($field, $input)) {
                return true;
            }
        }

        return false;
    }

    private function targetTenantId(array $context): int
    {
        return (int) ($context['target_tenant_id'] ?? 0);
    }
}