#!/usr/bin/env python3
"""
Tests for POST /api/peers (peer provisioning) and DELETE /api/peers/<name>.

The new provisioning flow (added in the auth system) requires:
  - POST /api/peers body includes 'password'
  - On success: auth_manager, email_manager, calendar_manager, file_manager
    each have their create methods called once
  - On failure of any downstream service: earlier steps are rolled back
  - DELETE /api/peers/<name> must also tear down all four service accounts

All external managers are mocked so Docker and real services are never touched.
admin_client is an authenticated admin session.
"""

import os
import sys
import json
from pathlib import Path
from unittest.mock import patch, MagicMock, call

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent / 'api'))

from app import app
from auth_manager import AuthManager


# ── helpers ───────────────────────────────────────────────────────────────────

def _make_auth_manager(tmp_path):
    data_dir = str(tmp_path / 'data')
    config_dir = str(tmp_path / 'config')
    os.makedirs(data_dir, exist_ok=True)
    os.makedirs(config_dir, exist_ok=True)
    mgr = AuthManager(data_dir=data_dir, config_dir=config_dir)
    mgr.create_user('admin', 'AdminPass123!', 'admin')
    return mgr


def _login(client, username='admin', password='AdminPass123!'):
    return client.post(
        '/api/auth/login',
        data=json.dumps({'username': username, 'password': password}),
        content_type='application/json',
    )


def _peer_payload(**overrides):
    base = {
        'name': 'alice',
        'public_key': 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=',
        'password': 'AlicePass123!',
    }
    base.update(overrides)
    return base


def _post_peer(client, payload=None):
    if payload is None:
        payload = _peer_payload()
    return client.post(
        '/api/peers',
        data=json.dumps(payload),
        content_type='application/json',
    )


def _delete_peer(client, name='alice'):
    return client.delete(f'/api/peers/{name}')


# ── fixtures ──────────────────────────────────────────────────────────────────

@pytest.fixture
def auth_mgr(tmp_path):
    return _make_auth_manager(tmp_path)


@pytest.fixture
def mock_email_mgr():
    m = MagicMock()
    m.create_email_user.return_value = True
    m.delete_email_user.return_value = True
    return m


@pytest.fixture
def mock_calendar_mgr():
    m = MagicMock()
    m.create_calendar_user.return_value = True
    m.delete_calendar_user.return_value = True
    return m


@pytest.fixture
def mock_file_mgr():
    m = MagicMock()
    m.create_user.return_value = True
    m.delete_user.return_value = True
    return m


@pytest.fixture
def mock_wg_mgr():
    m = MagicMock()
    m.add_peer.return_value = {'success': True, 'ip': '10.0.0.5'}
    m.remove_peer.return_value = True
    m._get_configured_address.return_value = '10.0.0.1/24'
    return m


@pytest.fixture
def mock_peer_registry():
    m = MagicMock()
    m.add_peer.return_value = True
    m.remove_peer.return_value = True
    m.get_peer.return_value = {
        'peer': 'alice',
        'ip': '10.0.0.5',
        'public_key': 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=',
        'service_access': ['mail', 'calendar', 'files', 'webdav'],
    }
    m.list_peers.return_value = []
    return m


@pytest.fixture
def admin_client(auth_mgr, mock_email_mgr, mock_calendar_mgr,
                 mock_file_mgr, mock_wg_mgr, mock_peer_registry):
    """Authenticated admin client with all service managers mocked."""
    app.config['TESTING'] = True
    app.config['SECRET_KEY'] = 'test-secret'

    patches = [
        patch('app.auth_manager', auth_mgr),
        patch('app.email_manager', mock_email_mgr),
        patch('app.calendar_manager', mock_calendar_mgr),
        patch('app.file_manager', mock_file_mgr),
        patch('app.wireguard_manager', mock_wg_mgr),
        patch('app.peer_registry', mock_peer_registry),
        # Prevent firewall_manager from running real iptables commands
        patch('app.firewall_manager'),
    ]

    try:
        import auth_routes
        patches.append(
            patch.object(auth_routes, 'auth_manager', auth_mgr, create=True)
        )
    except (ImportError, AttributeError):
        pass

    started = [p.start() for p in patches]
    try:
        with app.test_client() as client:
            r = _login(client)
            assert r.status_code == 200, f'admin login failed: {r.status_code} {r.data}'
            yield client
    finally:
        for p in patches:
            p.stop()


# ── POST /api/peers — happy path ──────────────────────────────────────────────

def test_create_peer_returns_201(admin_client):
    r = _post_peer(admin_client)
    assert r.status_code == 201


def test_create_peer_provisions_all_services(
        admin_client, auth_mgr,
        mock_email_mgr, mock_calendar_mgr, mock_file_mgr):
    """All four service create methods must be called exactly once."""
    _post_peer(admin_client)
    # auth provisioning — check user was created in the real auth_mgr
    # (we use the real auth_mgr so we can inspect the result directly)
    alice = auth_mgr.get_user('alice')
    assert alice is not None, 'auth_manager.create_user was not called for alice'

    mock_email_mgr.create_email_user.assert_called_once()
    mock_calendar_mgr.create_calendar_user.assert_called_once()
    mock_file_mgr.create_user.assert_called_once()


def test_create_peer_response_has_ip(admin_client):
    r = _post_peer(admin_client)
    data = json.loads(r.data)
    assert 'ip' in data or 'message' in data  # either shape is acceptable


# ── POST /api/peers — validation ──────────────────────────────────────────────

def test_create_peer_requires_password(admin_client):
    payload = _peer_payload()
    del payload['password']
    r = _post_peer(admin_client, payload)
    assert r.status_code == 400


def test_create_peer_password_too_short(admin_client):
    r = _post_peer(admin_client, _peer_payload(password='abc'))
    assert r.status_code == 400


def test_create_peer_requires_name(admin_client):
    payload = _peer_payload()
    del payload['name']
    r = _post_peer(admin_client, payload)
    assert r.status_code == 400


def test_create_peer_requires_public_key(admin_client):
    payload = _peer_payload()
    del payload['public_key']
    r = _post_peer(admin_client, payload)
    assert r.status_code == 400


# ── POST /api/peers — rollback on failure ─────────────────────────────────────

def test_create_peer_rollback_on_email_failure(
        auth_mgr, mock_email_mgr, mock_calendar_mgr,
        mock_file_mgr, mock_wg_mgr, mock_peer_registry):
    """If email_manager.create_email_user raises, auth user must be deleted (rollback)."""
    mock_email_mgr.create_email_user.side_effect = RuntimeError('SMTP server down')

    app.config['TESTING'] = True
    app.config['SECRET_KEY'] = 'test-secret'

    patches = [
        patch('app.auth_manager', auth_mgr),
        patch('app.email_manager', mock_email_mgr),
        patch('app.calendar_manager', mock_calendar_mgr),
        patch('app.file_manager', mock_file_mgr),
        patch('app.wireguard_manager', mock_wg_mgr),
        patch('app.peer_registry', mock_peer_registry),
        patch('app.firewall_manager'),
    ]
    try:
        import auth_routes
        patches.append(
            patch.object(auth_routes, 'auth_manager', auth_mgr, create=True)
        )
    except (ImportError, AttributeError):
        pass

    started = [p.start() for p in patches]
    try:
        with app.test_client() as client:
            r = _login(client)
            assert r.status_code == 200
            _post_peer(client)
            # alice must not remain in the auth store (rolled back)
            alice = auth_mgr.get_user('alice')
            assert alice is None, (
                'auth user alice was not rolled back after email_manager failure'
            )
    finally:
        for p in patches:
            p.stop()


def test_create_peer_rollback_on_wireguard_failure(
        auth_mgr, mock_email_mgr, mock_calendar_mgr,
        mock_file_mgr, mock_wg_mgr, mock_peer_registry):
    """If peer_registry.add_peer (WireGuard side) fails, all four service accounts
    must be deleted."""
    mock_peer_registry.add_peer.return_value = False

    app.config['TESTING'] = True
    app.config['SECRET_KEY'] = 'test-secret'

    patches = [
        patch('app.auth_manager', auth_mgr),
        patch('app.email_manager', mock_email_mgr),
        patch('app.calendar_manager', mock_calendar_mgr),
        patch('app.file_manager', mock_file_mgr),
        patch('app.wireguard_manager', mock_wg_mgr),
        patch('app.peer_registry', mock_peer_registry),
        patch('app.firewall_manager'),
    ]
    try:
        import auth_routes
        patches.append(
            patch.object(auth_routes, 'auth_manager', auth_mgr, create=True)
        )
    except (ImportError, AttributeError):
        pass

    started = [p.start() for p in patches]
    try:
        with app.test_client() as client:
            r = _login(client)
            assert r.status_code == 200
            _post_peer(client)

            # All service delete methods should have been called for cleanup
            mock_email_mgr.delete_email_user.assert_called()
            mock_calendar_mgr.delete_calendar_user.assert_called()
            mock_file_mgr.delete_user.assert_called()
    finally:
        for p in patches:
            p.stop()


# ── DELETE /api/peers/<name> ──────────────────────────────────────────────────

def test_delete_peer_returns_200(admin_client):
    r = _delete_peer(admin_client, 'alice')
    assert r.status_code == 200


def test_delete_peer_cleans_all_services(
        auth_mgr, mock_email_mgr, mock_calendar_mgr,
        mock_file_mgr, mock_wg_mgr, mock_peer_registry):
    """DELETE /api/peers/<name> must call delete on all four service managers."""
    app.config['TESTING'] = True
    app.config['SECRET_KEY'] = 'test-secret'

    patches = [
        patch('app.auth_manager', auth_mgr),
        patch('app.email_manager', mock_email_mgr),
        patch('app.calendar_manager', mock_calendar_mgr),
        patch('app.file_manager', mock_file_mgr),
        patch('app.wireguard_manager', mock_wg_mgr),
        patch('app.peer_registry', mock_peer_registry),
        patch('app.firewall_manager'),
    ]
    try:
        import auth_routes
        patches.append(
            patch.object(auth_routes, 'auth_manager', auth_mgr, create=True)
        )
    except (ImportError, AttributeError):
        pass

    started = [p.start() for p in patches]
    try:
        with app.test_client() as client:
            r = _login(client)
            assert r.status_code == 200

            # Seed the auth store so auth_manager.delete_user has something to delete
            auth_mgr.create_user('alice', 'AlicePass123!', 'peer')

            _delete_peer(client, 'alice')

            # All four service delete methods must have been invoked
            mock_email_mgr.delete_email_user.assert_called()
            mock_calendar_mgr.delete_calendar_user.assert_called()
            mock_file_mgr.delete_user.assert_called()
            alice = auth_mgr.get_user('alice')
            assert alice is None, 'auth user alice was not removed on peer delete'
    finally:
        for p in patches:
            p.stop()


def test_delete_nonexistent_peer_returns_gracefully(admin_client, mock_peer_registry):
    mock_peer_registry.get_peer.return_value = None
    mock_peer_registry.remove_peer.return_value = False
    r = _delete_peer(admin_client, 'nobody')
    # Route must not 500 when the peer simply doesn't exist
    assert r.status_code in (200, 404)