"""Integration tests for AI Chat Builder endpoints.

These tests mock the AI provider to avoid real API calls.
"""
import pytest
from unittest.mock import AsyncMock, patch, PropertyMock

pytestmark = pytest.mark.asyncio


@pytest.fixture(autouse=True)
def _enable_ai():
    """Ensure ai_enabled returns True even without API keys in CI."""
    with patch(
        "app.core.config.Settings.ai_enabled",
        new_callable=PropertyMock,
        return_value=True,
    ):
        yield


@pytest.fixture
def mock_ai_provider():
    """Mock AI provider that returns realistic responses."""
    provider = AsyncMock()
    provider.generate_text = AsyncMock(return_value=(
        "Great question! Let's build a troubleshooting flow for DNS resolution issues. "
        "To start, I need to understand the scope.\n\n"
        "Who is the target audience for this flow? Are we targeting:\n"
        "- Tier 1 help desk (basic checks only)\n"
        "- Tier 2 desktop support (intermediate diagnostics)\n"
        "- Tier 3 systems engineers (deep DNS troubleshooting)\n\n"
        "[PHASE:scoping]",
        500,  # input tokens
        200,  # output tokens
    ))
    return provider


async def test_create_chat_session(client, auth_headers, mock_ai_provider):
    """POST /ai/chat/sessions creates a session and returns AI greeting."""
    with patch("app.core.ai_chat_service.get_ai_provider", return_value=mock_ai_provider):
        resp = await client.post(
            "/api/v1/ai/chat/sessions",
            json={"flow_type": "troubleshooting"},
            headers=auth_headers,
        )

    assert resp.status_code == 201
    data = resp.json()
    assert "session_id" in data
    assert "greeting" in data
    assert data["current_phase"] == "scoping"
    assert len(data["greeting"]) > 0


async def test_send_message(client, auth_headers, mock_ai_provider):
    """POST /ai/chat/sessions/{id}/messages returns AI response."""
    # Create session first
    with patch("app.core.ai_chat_service.get_ai_provider", return_value=mock_ai_provider):
        create_resp = await client.post(
            "/api/v1/ai/chat/sessions",
            json={"flow_type": "troubleshooting"},
            headers=auth_headers,
        )
    session_id = create_resp.json()["session_id"]

    # Mock response with tree update — must pass validate_generated_tree (min 5 nodes)
    import json
    tree_obj = {
        "id": "root", "type": "decision",
        "question": "What DNS symptom is the user experiencing?",
        "options": [
            {"id": "opt-1", "label": "Cannot resolve any domains", "next_node_id": "dns-check"},
            {"id": "opt-2", "label": "Intermittent failures", "next_node_id": "dns-cache-fix"},
        ],
        "children": [
            {
                "id": "dns-check", "type": "decision",
                "question": "Is the DNS Client service running?",
                "options": [
                    {"id": "dc-1", "label": "Yes", "next_node_id": "dns-fwd-fix"},
                    {"id": "dc-2", "label": "No", "next_node_id": "dns-svc-fix"},
                ],
                "children": [
                    {"id": "dns-fwd-fix", "type": "solution", "title": "Check DNS Forwarders",
                     "description": "DNS forwarders may be misconfigured",
                     "resolution_steps": ["Check forwarder config"]},
                    {"id": "dns-svc-fix", "type": "solution", "title": "Restart DNS Service",
                     "description": "DNS Client service is stopped",
                     "resolution_steps": ["Start-Service Dnscache"]},
                ],
            },
            {"id": "dns-cache-fix", "type": "solution", "title": "Stale DNS Cache",
             "description": "DNS cache has stale entries",
             "resolution_steps": ["ipconfig /flushdns"]},
        ],
    }
    tree_json = json.dumps(tree_obj)
    mock_ai_provider.generate_text = AsyncMock(return_value=(
        "Good, targeting Tier 2 support. Let's start with the first diagnostic question.\n\n"
        "The root question should be: 'What DNS symptom is the user experiencing?'\n\n"
        f"[TREE_UPDATE]\n{tree_json}\n[/TREE_UPDATE]\n\n"
        "[PHASE:discovery]",
        800,
        400,
    ))

    with patch("app.core.ai_chat_service.get_ai_provider", return_value=mock_ai_provider):
        resp = await client.post(
            f"/api/v1/ai/chat/sessions/{session_id}/messages",
            json={"content": "This is for Tier 2 support, hybrid environment with on-prem AD."},
            headers=auth_headers,
        )

    assert resp.status_code == 200
    data = resp.json()
    assert "content" in data
    assert data["current_phase"] == "discovery"
    assert data["working_tree"] is not None
    assert data["working_tree"]["type"] == "decision"
    # Markers should be stripped from content
    assert "[TREE_UPDATE]" not in data["content"]
    assert "[PHASE:" not in data["content"]


async def test_get_session(client, auth_headers, mock_ai_provider):
    """GET /ai/chat/sessions/{id} returns full session state."""
    with patch("app.core.ai_chat_service.get_ai_provider", return_value=mock_ai_provider):
        create_resp = await client.post(
            "/api/v1/ai/chat/sessions",
            json={"flow_type": "troubleshooting"},
            headers=auth_headers,
        )
    session_id = create_resp.json()["session_id"]

    resp = await client.get(
        f"/api/v1/ai/chat/sessions/{session_id}",
        headers=auth_headers,
    )

    assert resp.status_code == 200
    data = resp.json()
    assert data["session_id"] == session_id
    assert data["status"] == "active"
    assert data["flow_type"] == "troubleshooting"
    # Hidden primer message should be filtered out
    assert all(
        msg.get("role") == "assistant" or not msg.get("hidden")
        for msg in data["conversation_history"]
    )


async def test_abandon_session(client, auth_headers, mock_ai_provider):
    """DELETE /ai/chat/sessions/{id} sets status to abandoned."""
    with patch("app.core.ai_chat_service.get_ai_provider", return_value=mock_ai_provider):
        create_resp = await client.post(
            "/api/v1/ai/chat/sessions",
            json={"flow_type": "troubleshooting"},
            headers=auth_headers,
        )
    session_id = create_resp.json()["session_id"]

    resp = await client.delete(
        f"/api/v1/ai/chat/sessions/{session_id}",
        headers=auth_headers,
    )
    assert resp.status_code == 204

    # Verify session is abandoned
    get_resp = await client.get(
        f"/api/v1/ai/chat/sessions/{session_id}",
        headers=auth_headers,
    )
    assert get_resp.json()["status"] == "abandoned"


async def test_session_not_found(client, auth_headers):
    """Accessing nonexistent session returns 404."""
    import uuid
    fake_id = str(uuid.uuid4())
    resp = await client.get(
        f"/api/v1/ai/chat/sessions/{fake_id}",
        headers=auth_headers,
    )
    assert resp.status_code == 404


async def test_ai_disabled_returns_503(client, auth_headers):
    """When AI is not configured, endpoints return 503."""
    with patch("app.api.endpoints.ai_chat.settings") as mock_settings:
        mock_settings.ai_enabled = False
        resp = await client.post(
            "/api/v1/ai/chat/sessions",
            json={"flow_type": "troubleshooting"},
            headers=auth_headers,
        )
    assert resp.status_code == 503