#!/usr/bin/env python3
"""
Tests for PUT /api/peers/<peer_name>.

Key scenarios:
- 404 when peer_registry.get_peer returns None
- 200 on successful update
- config_needs_reinstall=True in response when internet_access changes
- config_needs_reinstall=False (config_changed=False) when only description changes
"""

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

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

from app import app


class TestUpdatePeer(unittest.TestCase):

    def setUp(self):
        app.config['TESTING'] = True
        self.client = app.test_client()

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_returns_404_when_peer_not_found(self, mock_reg, mock_fw):
        mock_reg.get_peer.return_value = None
        r = self.client.put(
            '/api/peers/ghost',
            data=json.dumps({'description': 'updated'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 404)
        data = json.loads(r.data)
        self.assertIn('error', data)

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_returns_200_on_success(self, mock_reg, mock_fw):
        existing = {
            'peer': 'alice',
            'ip': '10.0.0.2',
            'internet_access': True,
            'public_key': 'KEY==',
        }
        mock_reg.get_peer.return_value = existing
        mock_reg.update_peer.return_value = True
        mock_reg.list_peers.return_value = [existing]
        mock_fw.apply_peer_rules.return_value = None
        mock_fw.apply_all_dns_rules.return_value = None

        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'description': 'my laptop'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 200)
        data = json.loads(r.data)
        self.assertIn('message', data)

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_config_changed_true_when_internet_access_changes(
        self, mock_reg, mock_fw
    ):
        existing = {
            'peer': 'alice',
            'ip': '10.0.0.2',
            'internet_access': True,
            'public_key': 'KEY==',
        }
        mock_reg.get_peer.return_value = existing
        mock_reg.update_peer.return_value = True
        mock_reg.list_peers.return_value = [existing]
        mock_fw.apply_peer_rules.return_value = None
        mock_fw.apply_all_dns_rules.return_value = None

        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'internet_access': False}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 200)
        data = json.loads(r.data)
        self.assertTrue(data['config_changed'])

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_config_changed_false_when_only_description_changes(
        self, mock_reg, mock_fw
    ):
        existing = {
            'peer': 'alice',
            'ip': '10.0.0.2',
            'internet_access': True,
            'public_key': 'KEY==',
        }
        mock_reg.get_peer.return_value = existing
        mock_reg.update_peer.return_value = True
        mock_reg.list_peers.return_value = [existing]
        mock_fw.apply_peer_rules.return_value = None
        mock_fw.apply_all_dns_rules.return_value = None

        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'description': 'just a label'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 200)
        data = json.loads(r.data)
        self.assertFalse(data['config_changed'])

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_returns_500_when_update_fails(self, mock_reg, mock_fw):
        existing = {
            'peer': 'alice',
            'ip': '10.0.0.2',
            'internet_access': True,
            'public_key': 'KEY==',
        }
        mock_reg.get_peer.return_value = existing
        mock_reg.update_peer.return_value = False

        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'description': 'fail'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 500)
        self.assertIn('error', json.loads(r.data))

    @patch('app.firewall_manager')
    @patch('app.peer_registry')
    def test_update_peer_config_changed_true_when_ip_changes(self, mock_reg, mock_fw):
        existing = {
            'peer': 'alice',
            'ip': '10.0.0.2',
            'internet_access': True,
            'public_key': 'KEY==',
        }
        mock_reg.get_peer.return_value = existing
        mock_reg.update_peer.return_value = True
        mock_reg.list_peers.return_value = [existing]
        mock_fw.apply_peer_rules.return_value = None
        mock_fw.apply_all_dns_rules.return_value = None

        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'ip': '10.0.0.99'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 200)
        data = json.loads(r.data)
        self.assertTrue(data['config_changed'])

    @patch('app.peer_registry')
    def test_update_peer_returns_500_on_exception(self, mock_reg):
        mock_reg.get_peer.side_effect = Exception('disk error')
        r = self.client.put(
            '/api/peers/alice',
            data=json.dumps({'description': 'test'}),
            content_type='application/json',
        )
        self.assertEqual(r.status_code, 500)
        self.assertIn('error', json.loads(r.data))


if __name__ == '__main__':
    unittest.main()