"""Unit tests for AgentRegistry."""
import pytest
from unittest.mock import AsyncMock, MagicMock
from agent_service.agents.registry import AgentRegistry


def _make_registry():
    return AgentRegistry()


def _make_agent(name='test_agent'):
    agent = MagicMock()
    agent.name = name
    return agent


# ── register / get_agent_instance ───────────────────────────────────────────

def test_register_stores_instance():
    reg = _make_registry()
    agent = _make_agent()
    reg.register('test_agent', agent)
    assert reg.get_agent_instance('test_agent') is agent


def test_register_missing_returns_none():
    reg = _make_registry()
    assert reg.get_agent_instance('nonexistent') is None


def test_register_activates_agent():
    reg = _make_registry()
    reg.register('test_agent', _make_agent())
    assert 'test_agent' in reg._active


def test_register_assigns_default_capability():
    reg = _make_registry()
    reg.register('test_agent', _make_agent())
    assert reg._capabilities.get('test_agent')


def test_register_known_agent_uses_default_description():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent('crm_agent'))
    assert 'crm' in reg._capabilities['crm_agent'].lower() or \
           'lead' in reg._capabilities['crm_agent'].lower()


def test_register_multiple_agents():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent('crm_agent'))
    reg.register('sales_agent', _make_agent('sales_agent'))
    assert len(reg._agents) == 2


# ── is_active ────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_is_active_after_register():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    assert await reg.is_active('crm_agent') is True


@pytest.mark.asyncio
async def test_is_active_unknown_agent():
    reg = _make_registry()
    assert await reg.is_active('ghost_agent') is False


# ── get_active_agents ────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_get_active_agents_returns_only_registered():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    reg._active.add('ghost_agent')  # active but no instance
    result = await reg.get_active_agents()
    keys = {r['agent_key'] for r in result}
    assert 'crm_agent' in keys
    assert 'ghost_agent' not in keys


@pytest.mark.asyncio
async def test_get_active_agents_includes_capabilities():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    result = await reg.get_active_agents()
    assert any('capabilities_summary' in r for r in result)


@pytest.mark.asyncio
async def test_get_active_agents_empty_registry():
    reg = _make_registry()
    result = await reg.get_active_agents()
    assert result == []


# ── get_all ──────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_get_all_includes_all_registered():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    reg.register('sales_agent', _make_agent())
    result = await reg.get_all()
    names = {r['name'] for r in result}
    assert 'crm_agent' in names
    assert 'sales_agent' in names


@pytest.mark.asyncio
async def test_get_all_marks_active_flag():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    result = await reg.get_all()
    crm = next(r for r in result if r['name'] == 'crm_agent')
    assert crm['active'] is True
    assert crm['has_instance'] is True


# ── sync ─────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_sync_replaces_active_set():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    reg.register('sales_agent', _make_agent())
    await reg.sync(['sales_agent'])
    assert await reg.is_active('sales_agent') is True
    assert await reg.is_active('crm_agent') is False


@pytest.mark.asyncio
async def test_sync_with_empty_list_deactivates_all():
    reg = _make_registry()
    reg.register('crm_agent', _make_agent())
    await reg.sync([])
    assert await reg.is_active('crm_agent') is False


# ── load_from_odoo ───────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_load_from_odoo_sets_active_agents():
    reg = _make_registry()
    odoo = MagicMock()
    odoo.search_read = AsyncMock(return_value=[
        {'agent_name': 'crm_agent', 'domain': 'CRM leads', 'backend': 'local'},
        {'agent_name': 'sales_agent', 'domain': '', 'backend': 'cloud'},
    ])
    await reg.load_from_odoo(odoo)
    assert 'crm_agent' in reg._active
    assert 'sales_agent' in reg._active


@pytest.mark.asyncio
async def test_load_from_odoo_uses_domain_when_present():
    reg = _make_registry()
    odoo = MagicMock()
    odoo.search_read = AsyncMock(return_value=[
        {'agent_name': 'crm_agent', 'domain': 'Custom CRM description', 'backend': 'local'},
    ])
    await reg.load_from_odoo(odoo)
    assert reg._capabilities['crm_agent'] == 'Custom CRM description'


@pytest.mark.asyncio
async def test_load_from_odoo_falls_back_to_default_when_no_domain():
    reg = _make_registry()
    odoo = MagicMock()
    odoo.search_read = AsyncMock(return_value=[
        {'agent_name': 'crm_agent', 'domain': '', 'backend': 'local'},
    ])
    await reg.load_from_odoo(odoo)
    assert reg._capabilities.get('crm_agent')


@pytest.mark.asyncio
async def test_load_from_odoo_handles_exception_gracefully():
    reg = _make_registry()
    odoo = MagicMock()
    odoo.search_read = AsyncMock(side_effect=Exception('DB error'))
    await reg.load_from_odoo(odoo)
    assert reg._active == set()