"""
Unit tests for machine module models: Machine, NetworkInterface, Binary, Process.

Tests cover:
1. Machine model creation and current() method
2. NetworkInterface model and network detection
3. Binary model lifecycle and state machine
4. Process model lifecycle, hierarchy, and state machine
5. JSONL serialization/deserialization
6. Manager methods
7. Process tracking methods (replacing pid_utils)
"""

import os
import sys
from pathlib import Path
from datetime import timedelta
from unittest.mock import patch

import pytest
from django.test import TestCase
from django.utils import timezone

from archivebox.machine.models import (
    Machine,
    NetworkInterface,
    Binary,
    Process,
    BinaryMachine,
    ProcessMachine,
    MACHINE_RECHECK_INTERVAL,
    PROCESS_RECHECK_INTERVAL,
    PID_REUSE_WINDOW,
)


class TestMachineModel(TestCase):
    """Test the Machine model."""

    def setUp(self):
        """Reset cached machine between tests."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None

    def test_machine_current_creates_machine(self):
        """Machine.current() should create a machine if none exists."""
        machine = Machine.current()

        self.assertIsNotNone(machine)
        self.assertIsNotNone(machine.id)
        self.assertIsNotNone(machine.guid)
        self.assertEqual(machine.hostname, os.uname().nodename)
        self.assertIn(machine.os_family, ['linux', 'darwin', 'windows', 'freebsd'])

    def test_machine_current_returns_cached(self):
        """Machine.current() should return cached machine within recheck interval."""
        machine1 = Machine.current()
        machine2 = Machine.current()

        self.assertEqual(machine1.id, machine2.id)

    def test_machine_current_refreshes_after_interval(self):
        """Machine.current() should refresh after recheck interval."""
        import archivebox.machine.models as models

        machine1 = Machine.current()

        # Manually expire the cache by modifying modified_at
        machine1.modified_at = timezone.now() - timedelta(seconds=MACHINE_RECHECK_INTERVAL + 1)
        machine1.save()
        models._CURRENT_MACHINE = machine1

        machine2 = Machine.current()

        # Should have fetched/updated the machine (same GUID)
        self.assertEqual(machine1.guid, machine2.guid)

    def test_machine_from_jsonl_update(self):
        """Machine.from_json() should update machine config."""
        Machine.current()  # Ensure machine exists
        record = {
            '_method': 'update',
            'key': 'WGET_BINARY',
            'value': '/usr/bin/wget',
        }

        result = Machine.from_json(record)

        self.assertIsNotNone(result)
        self.assertEqual(result.config.get('WGET_BINARY'), '/usr/bin/wget')

    def test_machine_from_jsonl_invalid(self):
        """Machine.from_json() should return None for invalid records."""
        result = Machine.from_json({'invalid': 'record'})
        self.assertIsNone(result)

    def test_machine_manager_current(self):
        """Machine.objects.current() should return current machine."""
        machine = Machine.objects.current()
        self.assertIsNotNone(machine)
        self.assertEqual(machine.id, Machine.current().id)


class TestNetworkInterfaceModel(TestCase):
    """Test the NetworkInterface model."""

    def setUp(self):
        """Reset cached interface between tests."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        models._CURRENT_INTERFACE = None

    def test_networkinterface_current_creates_interface(self):
        """NetworkInterface.current() should create an interface if none exists."""
        interface = NetworkInterface.current()

        self.assertIsNotNone(interface)
        self.assertIsNotNone(interface.id)
        self.assertIsNotNone(interface.machine)
        self.assertIsNotNone(interface.ip_local)

    def test_networkinterface_current_returns_cached(self):
        """NetworkInterface.current() should return cached interface within recheck interval."""
        interface1 = NetworkInterface.current()
        interface2 = NetworkInterface.current()

        self.assertEqual(interface1.id, interface2.id)

    def test_networkinterface_manager_current(self):
        """NetworkInterface.objects.current() should return current interface."""
        interface = NetworkInterface.objects.current()
        self.assertIsNotNone(interface)


class TestBinaryModel(TestCase):
    """Test the Binary model."""

    def setUp(self):
        """Reset cached binaries and create a machine."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        models._CURRENT_BINARIES = {}
        self.machine = Machine.current()

    def test_binary_creation(self):
        """Binary should be created with default values."""
        binary = Binary.objects.create(
            machine=self.machine,
            name='wget',
            binproviders='apt,brew,env',
        )

        self.assertIsNotNone(binary.id)
        self.assertEqual(binary.name, 'wget')
        self.assertEqual(binary.status, Binary.StatusChoices.QUEUED)
        self.assertFalse(binary.is_valid)

    def test_binary_is_valid(self):
        """Binary.is_valid should be True when abspath and version are set."""
        binary = Binary.objects.create(
            machine=self.machine,
            name='wget',
            abspath='/usr/bin/wget',
            version='1.21',
        )

        self.assertTrue(binary.is_valid)

    def test_binary_manager_get_valid_binary(self):
        """BinaryManager.get_valid_binary() should find valid binaries."""
        # Create invalid binary (no abspath)
        Binary.objects.create(machine=self.machine, name='wget')

        # Create valid binary
        Binary.objects.create(
            machine=self.machine,
            name='wget',
            abspath='/usr/bin/wget',
            version='1.21',
        )

        result = Binary.objects.get_valid_binary('wget')

        self.assertIsNotNone(result)
        self.assertEqual(result.abspath, '/usr/bin/wget')

    def test_binary_update_and_requeue(self):
        """Binary.update_and_requeue() should update fields and save."""
        binary = Binary.objects.create(machine=self.machine, name='test')
        old_modified = binary.modified_at

        binary.update_and_requeue(
            status=Binary.StatusChoices.STARTED,
            retry_at=timezone.now() + timedelta(seconds=60),
        )

        binary.refresh_from_db()
        self.assertEqual(binary.status, Binary.StatusChoices.STARTED)
        self.assertGreater(binary.modified_at, old_modified)


class TestBinaryStateMachine(TestCase):
    """Test the BinaryMachine state machine."""

    def setUp(self):
        """Create a machine and binary for state machine tests."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        self.machine = Machine.current()
        self.binary = Binary.objects.create(
            machine=self.machine,
            name='test-binary',
            binproviders='env',
        )

    def test_binary_state_machine_initial_state(self):
        """BinaryMachine should start in queued state."""
        sm = BinaryMachine(self.binary)
        self.assertEqual(sm.current_state.value, Binary.StatusChoices.QUEUED)

    def test_binary_state_machine_can_start(self):
        """BinaryMachine.can_start() should check name and binproviders."""
        sm = BinaryMachine(self.binary)
        self.assertTrue(sm.can_start())

        self.binary.binproviders = ''
        self.binary.save()
        sm = BinaryMachine(self.binary)
        self.assertFalse(sm.can_start())


class TestProcessModel(TestCase):
    """Test the Process model."""

    def setUp(self):
        """Create a machine for process tests."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        models._CURRENT_PROCESS = None
        self.machine = Machine.current()

    def test_process_creation(self):
        """Process should be created with default values."""
        process = Process.objects.create(
            machine=self.machine,
            cmd=['echo', 'hello'],
            pwd='/tmp',
        )

        self.assertIsNotNone(process.id)
        self.assertEqual(process.cmd, ['echo', 'hello'])
        self.assertEqual(process.status, Process.StatusChoices.QUEUED)
        self.assertIsNone(process.pid)
        self.assertIsNone(process.exit_code)

    def test_process_to_jsonl(self):
        """Process.to_json() should serialize correctly."""
        process = Process.objects.create(
            machine=self.machine,
            cmd=['echo', 'hello'],
            pwd='/tmp',
            timeout=60,
        )
        json_data = process.to_json()

        self.assertEqual(json_data['type'], 'Process')
        self.assertEqual(json_data['cmd'], ['echo', 'hello'])
        self.assertEqual(json_data['pwd'], '/tmp')
        self.assertEqual(json_data['timeout'], 60)

    def test_process_update_and_requeue(self):
        """Process.update_and_requeue() should update fields and save."""
        process = Process.objects.create(machine=self.machine, cmd=['test'])
        old_modified = process.modified_at

        process.update_and_requeue(
            status=Process.StatusChoices.RUNNING,
            pid=12345,
            started_at=timezone.now(),
        )

        process.refresh_from_db()
        self.assertEqual(process.status, Process.StatusChoices.RUNNING)
        self.assertEqual(process.pid, 12345)
        self.assertIsNotNone(process.started_at)


class TestProcessCurrent(TestCase):
    """Test Process.current() method."""

    def setUp(self):
        """Reset caches."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        models._CURRENT_PROCESS = None

    def test_process_current_creates_record(self):
        """Process.current() should create a Process for current PID."""
        proc = Process.current()

        self.assertIsNotNone(proc)
        self.assertEqual(proc.pid, os.getpid())
        self.assertEqual(proc.status, Process.StatusChoices.RUNNING)
        self.assertIsNotNone(proc.machine)
        self.assertIsNotNone(proc.started_at)

    def test_process_current_caches(self):
        """Process.current() should cache the result."""
        proc1 = Process.current()
        proc2 = Process.current()

        self.assertEqual(proc1.id, proc2.id)

    def test_process_detect_type_orchestrator(self):
        """_detect_process_type should detect orchestrator."""
        with patch('sys.argv', ['archivebox', 'manage', 'orchestrator']):
            result = Process._detect_process_type()
            self.assertEqual(result, Process.TypeChoices.ORCHESTRATOR)

    def test_process_detect_type_cli(self):
        """_detect_process_type should detect CLI commands."""
        with patch('sys.argv', ['archivebox', 'add', 'http://example.com']):
            result = Process._detect_process_type()
            self.assertEqual(result, Process.TypeChoices.CLI)

    def test_process_detect_type_worker(self):
        """_detect_process_type should detect workers."""
        with patch('sys.argv', ['python', '-m', 'crawl_worker']):
            result = Process._detect_process_type()
            self.assertEqual(result, Process.TypeChoices.WORKER)


class TestProcessHierarchy(TestCase):
    """Test Process parent/child relationships."""

    def setUp(self):
        """Create machine."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        self.machine = Machine.current()

    def test_process_parent_child(self):
        """Process should track parent/child relationships."""
        parent = Process.objects.create(
            machine=self.machine,
            process_type=Process.TypeChoices.CLI,
            status=Process.StatusChoices.RUNNING,
            pid=1,
            started_at=timezone.now(),
        )

        child = Process.objects.create(
            machine=self.machine,
            parent=parent,
            process_type=Process.TypeChoices.WORKER,
            status=Process.StatusChoices.RUNNING,
            pid=2,
            started_at=timezone.now(),
        )

        self.assertEqual(child.parent, parent)
        self.assertIn(child, parent.children.all())

    def test_process_root(self):
        """Process.root should return the root of the hierarchy."""
        root = Process.objects.create(
            machine=self.machine,
            process_type=Process.TypeChoices.CLI,
            status=Process.StatusChoices.RUNNING,
            started_at=timezone.now(),
        )
        child = Process.objects.create(
            machine=self.machine,
            parent=root,
            status=Process.StatusChoices.RUNNING,
            started_at=timezone.now(),
        )
        grandchild = Process.objects.create(
            machine=self.machine,
            parent=child,
            status=Process.StatusChoices.RUNNING,
            started_at=timezone.now(),
        )

        self.assertEqual(grandchild.root, root)
        self.assertEqual(child.root, root)
        self.assertEqual(root.root, root)

    def test_process_depth(self):
        """Process.depth should return depth in tree."""
        root = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            started_at=timezone.now(),
        )
        child = Process.objects.create(
            machine=self.machine,
            parent=root,
            status=Process.StatusChoices.RUNNING,
            started_at=timezone.now(),
        )

        self.assertEqual(root.depth, 0)
        self.assertEqual(child.depth, 1)


class TestProcessLifecycle(TestCase):
    """Test Process lifecycle methods."""

    def setUp(self):
        """Create machine."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        self.machine = Machine.current()

    def test_process_is_running_current_pid(self):
        """is_running should be True for current PID."""
        proc = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            pid=os.getpid(),
            started_at=timezone.now(),
        )

        self.assertTrue(proc.is_running)

    def test_process_is_running_fake_pid(self):
        """is_running should be False for non-existent PID."""
        proc = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            pid=999999,
            started_at=timezone.now(),
        )

        self.assertFalse(proc.is_running)

    def test_process_poll_detects_exit(self):
        """poll() should detect exited process."""
        proc = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            pid=999999,
            started_at=timezone.now(),
        )

        exit_code = proc.poll()

        self.assertIsNotNone(exit_code)
        proc.refresh_from_db()
        self.assertEqual(proc.status, Process.StatusChoices.EXITED)

    def test_process_terminate_dead_process(self):
        """terminate() should handle already-dead process."""
        proc = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            pid=999999,
            started_at=timezone.now(),
        )

        result = proc.terminate()

        self.assertFalse(result)
        proc.refresh_from_db()
        self.assertEqual(proc.status, Process.StatusChoices.EXITED)


class TestProcessClassMethods(TestCase):
    """Test Process class methods for querying."""

    def setUp(self):
        """Create machine."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        self.machine = Machine.current()

    def test_get_running(self):
        """get_running should return running processes."""
        proc = Process.objects.create(
            machine=self.machine,
            process_type=Process.TypeChoices.HOOK,
            status=Process.StatusChoices.RUNNING,
            pid=99999,
            started_at=timezone.now(),
        )

        running = Process.get_running(process_type=Process.TypeChoices.HOOK)

        self.assertIn(proc, running)

    def test_get_running_count(self):
        """get_running_count should count running processes."""
        for i in range(3):
            Process.objects.create(
                machine=self.machine,
                process_type=Process.TypeChoices.HOOK,
                status=Process.StatusChoices.RUNNING,
                pid=99900 + i,
                started_at=timezone.now(),
            )

        count = Process.get_running_count(process_type=Process.TypeChoices.HOOK)
        self.assertGreaterEqual(count, 3)

    def test_cleanup_stale_running(self):
        """cleanup_stale_running should mark stale processes as exited."""
        stale = Process.objects.create(
            machine=self.machine,
            status=Process.StatusChoices.RUNNING,
            pid=999999,
            started_at=timezone.now() - PID_REUSE_WINDOW - timedelta(hours=1),
        )

        cleaned = Process.cleanup_stale_running()

        self.assertGreaterEqual(cleaned, 1)
        stale.refresh_from_db()
        self.assertEqual(stale.status, Process.StatusChoices.EXITED)


class TestProcessStateMachine(TestCase):
    """Test the ProcessMachine state machine."""

    def setUp(self):
        """Create a machine and process for state machine tests."""
        import archivebox.machine.models as models
        models._CURRENT_MACHINE = None
        self.machine = Machine.current()
        self.process = Process.objects.create(
            machine=self.machine,
            cmd=['echo', 'test'],
            pwd='/tmp',
        )

    def test_process_state_machine_initial_state(self):
        """ProcessMachine should start in queued state."""
        sm = ProcessMachine(self.process)
        self.assertEqual(sm.current_state.value, Process.StatusChoices.QUEUED)

    def test_process_state_machine_can_start(self):
        """ProcessMachine.can_start() should check cmd and machine."""
        sm = ProcessMachine(self.process)
        self.assertTrue(sm.can_start())

        self.process.cmd = []
        self.process.save()
        sm = ProcessMachine(self.process)
        self.assertFalse(sm.can_start())

    def test_process_state_machine_is_exited(self):
        """ProcessMachine.is_exited() should check exit_code."""
        sm = ProcessMachine(self.process)
        self.assertFalse(sm.is_exited())

        self.process.exit_code = 0
        self.process.save()
        sm = ProcessMachine(self.process)
        self.assertTrue(sm.is_exited())


if __name__ == '__main__':
    pytest.main([__file__, '-v'])