//! Integration tests for Tenant Path (User → Org → Project) with RBAC enforcement
//!
//! This test suite validates the E2E flow of IAM tenant setup and authorization:
//! 1. User creation and organization assignment
//! 2. Project creation scoped to organizations
//! 3. Role-based access control (RBAC) enforcement
//! 4. Cross-tenant isolation (users can't access other tenants' resources)
//! 5. Hierarchical permission evaluation

use std::sync::Arc;

use iam_api::iam_service::{IamAdminService, IamAuthzService};
use iam_authz::{AuthzDecision, AuthzRequest, PolicyCache, PolicyEvaluator};
use iam_store::{Backend, BindingStore, PrincipalStore, RoleStore};
use iam_types::{Permission, PolicyBinding, Principal, PrincipalRef, Resource, Role, Scope};

/// Test helper: Create all required stores and services
fn setup_services() -> (
    IamAdminService,
    IamAuthzService,
    Arc<PrincipalStore>,
    Arc<RoleStore>,
    Arc<BindingStore>,
    Arc<PolicyEvaluator>,
) {
    let backend = Arc::new(Backend::memory());
    let principal_store = Arc::new(PrincipalStore::new(backend.clone()));
    let role_store = Arc::new(RoleStore::new(backend.clone()));
    let binding_store = Arc::new(BindingStore::new(backend));

    let admin_service = IamAdminService::new(
        principal_store.clone(),
        role_store.clone(),
        binding_store.clone(),
    );

    let cache = Arc::new(PolicyCache::default_config());
    let evaluator = Arc::new(
        PolicyEvaluator::new(binding_store.clone(), role_store.clone(), cache).with_config(
            iam_authz::PolicyEvaluatorConfig {
                use_cache: false,
                max_bindings: 1000,
                debug: false,
            },
        ),
    );

    let authz_service = IamAuthzService::new(evaluator.clone(), principal_store.clone());

    (
        admin_service,
        authz_service,
        principal_store,
        role_store,
        binding_store,
        evaluator,
    )
}

/// Test Scenario 1: Complete tenant setup flow
///
/// Validates:
/// - User creation
/// - Organization scope assignment
/// - Project creation within organization
/// - Role binding at org and project levels
/// - Authorization checks for created resources
#[tokio::test]
async fn test_tenant_setup_flow() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    // Step 1: Create User Alice
    let mut alice = Principal::new_user("alice", "Alice Smith");
    alice.email = Some("alice@example.com".to_string());
    alice.org_id = Some("acme-corp".to_string());
    principal_store.create(&alice).await.unwrap();

    // Step 2: Create a custom OrgAdmin role with proper resource patterns
    // Resource path format: org/{org_id}/project/{project_id}/{kind}/{id}
    let org_admin_role = Role::new(
        "OrgAdmin",
        Scope::org("*"),
        vec![Permission::new("*", "org/acme-corp/*")],
    )
    .with_display_name("Organization Administrator")
    .with_description("Full access to organization resources");
    role_store.create(&org_admin_role).await.unwrap();

    // Step 3: Create OrgAdmin role binding for Alice at Org scope
    let org_scope = Scope::org("acme-corp");
    let alice_org_binding = PolicyBinding::new(
        "binding-alice-org-admin",
        PrincipalRef::user("alice"),
        "roles/OrgAdmin",
        org_scope.clone(),
    );
    binding_store.create(&alice_org_binding).await.unwrap();

    // Step 4: Verify Alice can access org-level resources
    let org_resource = Resource::new("organization", "acme-corp", "acme-corp", "acme-corp");

    let request = AuthzRequest::new(alice.clone(), "org:manage", org_resource);
    let decision = evaluator.evaluate(&request).await.unwrap();

    assert!(
        decision.is_allowed(),
        "Alice should be allowed to manage org resources as OrgAdmin"
    );

    // Step 5: Verify Alice can access project resources (OrgAdmin includes projects)
    let project_resource = Resource::new("project", "project-alpha", "acme-corp", "project-alpha");

    let request = AuthzRequest::new(alice.clone(), "project:read", project_resource);
    let decision = evaluator.evaluate(&request).await.unwrap();

    assert!(
        decision.is_allowed(),
        "Alice (OrgAdmin) should be able to read projects in her org"
    );

    // Step 6: Create a compute instance in the project
    let instance = Resource::new("instance", "vm-001", "acme-corp", "project-alpha");

    let request = AuthzRequest::new(alice.clone(), "compute:instances:create", instance);
    let decision = evaluator.evaluate(&request).await.unwrap();

    assert!(
        decision.is_allowed(),
        "Alice (OrgAdmin) should be able to create instances in org projects"
    );
}

/// Test Scenario 2: Cross-tenant isolation
///
/// Validates:
/// - Two users in different organizations
/// - Each user has full access to their own org
/// - Users cannot access resources in other organizations
/// - Proper denial reasons are returned
#[tokio::test]
async fn test_cross_tenant_denial() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    // Create custom org admin roles with proper patterns for each org
    let org1_admin_role = Role::new(
        "Org1Admin",
        Scope::org("org-1"),
        vec![Permission::new("*", "org/org-1/*")],
    );
    role_store.create(&org1_admin_role).await.unwrap();

    let org2_admin_role = Role::new(
        "Org2Admin",
        Scope::org("org-2"),
        vec![Permission::new("*", "org/org-2/*")],
    );
    role_store.create(&org2_admin_role).await.unwrap();

    // Setup User A (Alice) with Org1
    let mut alice = Principal::new_user("alice", "Alice");
    alice.org_id = Some("org-1".to_string());
    principal_store.create(&alice).await.unwrap();

    let alice_binding = PolicyBinding::new(
        "alice-org1-admin",
        PrincipalRef::user("alice"),
        "roles/Org1Admin",
        Scope::org("org-1"),
    );
    binding_store.create(&alice_binding).await.unwrap();

    // Setup User B (Bob) with Org2
    let mut bob = Principal::new_user("bob", "Bob");
    bob.org_id = Some("org-2".to_string());
    principal_store.create(&bob).await.unwrap();

    let bob_binding = PolicyBinding::new(
        "bob-org2-admin",
        PrincipalRef::user("bob"),
        "roles/Org2Admin",
        Scope::org("org-2"),
    );
    binding_store.create(&bob_binding).await.unwrap();

    // Create resources in Org1 / Project1
    let org1_project1_instance = Resource::new("instance", "vm-alice-1", "org-1", "project-1");

    // Test 1: Alice CAN access Org1 resources
    let request = AuthzRequest::new(
        alice.clone(),
        "compute:instances:create",
        org1_project1_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "Alice should access her own org resources"
    );

    // Test 2: Bob CANNOT access Org1 resources (cross-tenant denial)
    let request = AuthzRequest::new(
        bob.clone(),
        "compute:instances:create",
        org1_project1_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "Bob should NOT access Alice's org resources"
    );

    // Verify denial reason mentions no matching policy
    if let AuthzDecision::Deny { reason } = decision {
        assert!(
            reason.contains("No") || reason.contains("not found") || reason.contains("binding"),
            "Denial reason should indicate lack of permissions: {}",
            reason
        );
    }

    // Create resources in Org2 / Project2
    let org2_project2_instance = Resource::new("instance", "vm-bob-1", "org-2", "project-2");

    // Test 3: Bob CAN access Org2 resources
    let request = AuthzRequest::new(
        bob.clone(),
        "compute:instances:create",
        org2_project2_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();

    assert!(
        decision.is_allowed(),
        "Bob should access his own org resources"
    );

    // Test 4: Alice CANNOT access Org2 resources (cross-tenant denial)
    let request = AuthzRequest::new(alice, "compute:instances:create", org2_project2_instance);
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "Alice should NOT access Bob's org resources"
    );
}

/// Test Scenario 3: RBAC enforcement at project level
///
/// Validates:
/// - ProjectAdmin has full access within project
/// - ProjectMember has limited access (own resources + read-only)
/// - Users without roles are denied access
/// - Role inheritance and permission evaluation
#[tokio::test]
async fn test_rbac_project_scope() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    let org_id = "acme-corp";
    let project_id = "project-delta";
    let project_scope = Scope::project(project_id, org_id);

    // Create custom roles with proper patterns
    // ProjectAdmin - full access to project resources
    let project_admin_role = Role::new(
        "ProjectAdmin",
        Scope::project("*", "*"),
        vec![Permission::new(
            "*",
            format!("org/{}/project/{}/*", org_id, project_id),
        )],
    );
    role_store.create(&project_admin_role).await.unwrap();

    // ProjectMember - read access + manage own resources
    let project_member_role = Role::new(
        "ProjectMember",
        Scope::project("*", "*"),
        vec![
            // Full access to own resources (with owner condition)
            Permission::new(
                "compute:instances:*",
                format!("org/{}/project/{}/instance/*", org_id, project_id),
            )
            .with_condition(iam_types::Condition::string_equals(
                "resource.owner",
                "${principal.id}",
            )),
            // Read access to all project resources
            Permission::new(
                "*:*:read",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
            Permission::new(
                "*:*:list",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
        ],
    );
    role_store.create(&project_member_role).await.unwrap();

    // Create three users in the same org/project
    let mut admin_user = Principal::new_user("admin-user", "Project Admin");
    admin_user.org_id = Some(org_id.to_string());
    admin_user.project_id = Some(project_id.to_string());
    principal_store.create(&admin_user).await.unwrap();

    let mut member_user = Principal::new_user("member-user", "Project Member");
    member_user.org_id = Some(org_id.to_string());
    member_user.project_id = Some(project_id.to_string());
    principal_store.create(&member_user).await.unwrap();

    let mut guest_user = Principal::new_user("guest-user", "Guest User");
    guest_user.org_id = Some(org_id.to_string());
    principal_store.create(&guest_user).await.unwrap();

    // Assign ProjectAdmin role to admin_user
    let admin_binding = PolicyBinding::new(
        "admin-project-admin",
        PrincipalRef::user("admin-user"),
        "roles/ProjectAdmin",
        project_scope.clone(),
    );
    binding_store.create(&admin_binding).await.unwrap();

    // Assign ProjectMember role to member_user
    let member_binding = PolicyBinding::new(
        "member-project-member",
        PrincipalRef::user("member-user"),
        "roles/ProjectMember",
        project_scope.clone(),
    );
    binding_store.create(&member_binding).await.unwrap();

    // Note: guest_user has no role binding (should be denied)

    // Create test resources
    let admin_instance =
        Resource::new("instance", "vm-admin-1", org_id, project_id).with_owner("admin-user");
    let member_instance =
        Resource::new("instance", "vm-member-1", org_id, project_id).with_owner("member-user");
    let shared_volume = Resource::new("volume", "vol-shared", org_id, project_id);

    // Test 1: ProjectAdmin can create instances
    let request = AuthzRequest::new(
        admin_user.clone(),
        "compute:instances:create",
        admin_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "ProjectAdmin should create instances"
    );

    // Test 2: ProjectAdmin can delete any instance in project
    let request = AuthzRequest::new(
        admin_user.clone(),
        "compute:instances:delete",
        member_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "ProjectAdmin should delete any project instance"
    );

    // Test 3: ProjectMember can read instances (builtin permission)
    let request = AuthzRequest::new(
        member_user.clone(),
        "compute:instances:read",
        admin_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "ProjectMember should read project instances"
    );

    // Test 4: ProjectMember can list instances (builtin permission)
    let request = AuthzRequest::new(
        member_user.clone(),
        "compute:instances:list",
        shared_volume.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "ProjectMember should list project resources"
    );

    // Test 5: ProjectMember can manage their own instances (owner condition)
    let request = AuthzRequest::new(
        member_user.clone(),
        "compute:instances:create",
        member_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "ProjectMember should create own instances"
    );

    // Test 6: ProjectMember CANNOT delete others' instances (owner condition fails)
    let request = AuthzRequest::new(
        member_user.clone(),
        "compute:instances:delete",
        admin_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "ProjectMember should NOT delete others' instances"
    );

    // Test 7: Guest user (no role) is denied all access
    let request = AuthzRequest::new(
        guest_user.clone(),
        "compute:instances:read",
        shared_volume.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_denied(), "Guest should be denied without roles");

    let request = AuthzRequest::new(
        guest_user.clone(),
        "compute:instances:create",
        Resource::new("instance", "vm-guest", org_id, project_id).with_owner("guest-user"),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "Guest should NOT create instances without role"
    );
}

/// Test Scenario 4: Hierarchical scope inheritance
///
/// Validates:
/// - System scope permissions apply to all orgs/projects
/// - Org scope permissions apply to all projects within org
/// - Project scope permissions are isolated to that project
#[tokio::test]
async fn test_hierarchical_scope_inheritance() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    // Create custom roles
    // SystemAdmin - full access to everything
    let sys_admin_role = Role::new("SystemAdmin", Scope::System, vec![Permission::wildcard()]);
    role_store.create(&sys_admin_role).await.unwrap();

    // Org1Admin - full access to org-1 resources
    let org1_admin_role = Role::new(
        "Org1Admin",
        Scope::org("org-1"),
        vec![Permission::new("*", "org/org-1/*")],
    );
    role_store.create(&org1_admin_role).await.unwrap();

    // Create a system admin
    let sys_admin = Principal::new_user("sysadmin", "System Administrator");
    principal_store.create(&sys_admin).await.unwrap();

    let sys_admin_binding = PolicyBinding::new(
        "sysadmin-system",
        PrincipalRef::user("sysadmin"),
        "roles/SystemAdmin",
        Scope::System,
    );
    binding_store.create(&sys_admin_binding).await.unwrap();

    // Create org admin for org-1 only
    let org_admin = Principal::new_user("orgadmin", "Org Admin");
    principal_store.create(&org_admin).await.unwrap();

    let org_admin_binding = PolicyBinding::new(
        "orgadmin-org1",
        PrincipalRef::user("orgadmin"),
        "roles/Org1Admin",
        Scope::org("org-1"),
    );
    binding_store.create(&org_admin_binding).await.unwrap();

    // Test resources in different orgs/projects
    let org1_proj1_resource = Resource::new("instance", "vm-1", "org-1", "proj-1");
    let org1_proj2_resource = Resource::new("instance", "vm-2", "org-1", "proj-2");
    let org2_proj1_resource = Resource::new("instance", "vm-3", "org-2", "proj-1");

    // Test 1: SystemAdmin can access resources in ANY org/project
    for resource in [
        &org1_proj1_resource,
        &org1_proj2_resource,
        &org2_proj1_resource,
    ] {
        let request = AuthzRequest::new(
            sys_admin.clone(),
            "compute:instances:delete",
            resource.clone(),
        );
        let decision = evaluator.evaluate(&request).await.unwrap();
        assert!(
            decision.is_allowed(),
            "SystemAdmin should access all resources"
        );
    }

    // Test 2: OrgAdmin can access resources in org-1 projects
    for resource in [&org1_proj1_resource, &org1_proj2_resource] {
        let request = AuthzRequest::new(
            org_admin.clone(),
            "compute:instances:delete",
            resource.clone(),
        );
        let decision = evaluator.evaluate(&request).await.unwrap();
        assert!(
            decision.is_allowed(),
            "OrgAdmin should access all projects in their org"
        );
    }

    // Test 3: OrgAdmin CANNOT access resources in org-2
    let request = AuthzRequest::new(
        org_admin.clone(),
        "compute:instances:delete",
        org2_proj1_resource,
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "OrgAdmin should NOT access other orgs"
    );
}

/// Test Scenario 5: Custom role with fine-grained permissions
///
/// Validates:
/// - Creation of custom roles with specific permissions
/// - Permission pattern matching (action and resource patterns)
/// - Custom role assignment and evaluation
#[tokio::test]
async fn test_custom_role_fine_grained_permissions() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    let org_id = "tech-corp";
    let project_id = "backend-services";

    // Create a custom role: "StorageOperator" - can manage volumes but not instances
    let storage_operator_role = Role::new(
        "StorageOperator",
        Scope::project("*", "*"),
        vec![
            Permission::new(
                "storage:volumes:*",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
            Permission::new(
                "storage:snapshots:*",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
            Permission::new(
                "storage:*:read",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
            Permission::new(
                "storage:*:list",
                format!("org/{}/project/{}/*", org_id, project_id),
            ),
        ],
    )
    .with_display_name("Storage Operator")
    .with_description("Can manage storage resources but not compute");

    role_store.create(&storage_operator_role).await.unwrap();

    // Create a user and assign the custom role
    let storage_user = Principal::new_user("storage-ops", "Storage Operator User");
    principal_store.create(&storage_user).await.unwrap();

    let storage_binding = PolicyBinding::new(
        "storage-ops-binding",
        PrincipalRef::user("storage-ops"),
        "roles/StorageOperator",
        Scope::project(project_id, org_id),
    );
    binding_store.create(&storage_binding).await.unwrap();

    // Create test resources
    let volume = Resource::new("volume", "vol-001", org_id, project_id);
    let snapshot = Resource::new("snapshot", "snap-001", org_id, project_id);
    let instance = Resource::new("instance", "vm-001", org_id, project_id);

    // Test 1: Storage operator CAN manage volumes
    let request = AuthzRequest::new(
        storage_user.clone(),
        "storage:volumes:create",
        volume.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "StorageOperator should create volumes"
    );

    let request = AuthzRequest::new(storage_user.clone(), "storage:volumes:delete", volume);
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "StorageOperator should delete volumes"
    );

    // Test 2: Storage operator CAN manage snapshots
    let request = AuthzRequest::new(
        storage_user.clone(),
        "storage:snapshots:create",
        snapshot.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "StorageOperator should create snapshots"
    );

    // Test 3: Storage operator CAN read instances (read permission granted)
    let request = AuthzRequest::new(
        storage_user.clone(),
        "storage:instances:read",
        instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_allowed(),
        "StorageOperator should read instances"
    );

    // Test 4: Storage operator CANNOT create/delete instances (no permission)
    let request = AuthzRequest::new(
        storage_user.clone(),
        "compute:instances:create",
        instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "StorageOperator should NOT create instances"
    );

    let request = AuthzRequest::new(storage_user.clone(), "compute:instances:delete", instance);
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(
        decision.is_denied(),
        "StorageOperator should NOT delete instances"
    );
}

/// Test Scenario 6: Multiple role bindings (role aggregation)
///
/// Validates:
/// - A principal can have multiple role bindings
/// - Permissions from all roles are aggregated
/// - Most permissive role wins
#[tokio::test]
async fn test_multiple_role_bindings() {
    let (_admin_service, _authz_service, principal_store, role_store, binding_store, evaluator) =
        setup_services();

    let org_id = "multi-role-org";
    let project1 = "project-1";
    let project2 = "project-2";

    // Create custom roles
    // ReadOnly for project-1 - read/list/get operations only
    let readonly_role = Role::new(
        "ReadOnly",
        Scope::project("*", "*"),
        vec![
            Permission::new("*:*:read", format!("org/{}/project/{}/*", org_id, project1)),
            Permission::new("*:*:list", format!("org/{}/project/{}/*", org_id, project1)),
            Permission::new("*:*:get", format!("org/{}/project/{}/*", org_id, project1)),
        ],
    );
    role_store.create(&readonly_role).await.unwrap();

    // ProjectAdmin for project-2
    let project_admin_role = Role::new(
        "ProjectAdmin",
        Scope::project("*", "*"),
        vec![Permission::new(
            "*",
            format!("org/{}/project/{}/*", org_id, project2),
        )],
    );
    role_store.create(&project_admin_role).await.unwrap();

    // Create a user
    let user = Principal::new_user("multi-role-user", "Multi Role User");
    principal_store.create(&user).await.unwrap();

    // Assign ReadOnly role in project-1
    let readonly_binding = PolicyBinding::new(
        "readonly-proj1",
        PrincipalRef::user("multi-role-user"),
        "roles/ReadOnly",
        Scope::project(project1, org_id),
    );
    binding_store.create(&readonly_binding).await.unwrap();

    // Assign ProjectAdmin role in project-2
    let admin_binding = PolicyBinding::new(
        "admin-proj2",
        PrincipalRef::user("multi-role-user"),
        "roles/ProjectAdmin",
        Scope::project(project2, org_id),
    );
    binding_store.create(&admin_binding).await.unwrap();

    // Resources in different projects
    let proj1_instance = Resource::new("instance", "vm-1", org_id, project1);
    let proj2_instance = Resource::new("instance", "vm-2", org_id, project2);

    // Test 1: User can only READ in project-1 (ReadOnly role)
    let request = AuthzRequest::new(
        user.clone(),
        "compute:instances:read",
        proj1_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_allowed(), "Should read in project-1");

    let request = AuthzRequest::new(user.clone(), "compute:instances:delete", proj1_instance);
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_denied(), "Should NOT delete in project-1");

    // Test 2: User can do ANYTHING in project-2 (ProjectAdmin role)
    let request = AuthzRequest::new(
        user.clone(),
        "compute:instances:read",
        proj2_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_allowed(), "Should read in project-2");

    let request = AuthzRequest::new(
        user.clone(),
        "compute:instances:delete",
        proj2_instance.clone(),
    );
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_allowed(), "Should delete in project-2");

    let request = AuthzRequest::new(user.clone(), "compute:instances:create", proj2_instance);
    let decision = evaluator.evaluate(&request).await.unwrap();
    assert!(decision.is_allowed(), "Should create in project-2");
}