from __future__ import annotations

from unittest.mock import AsyncMock, MagicMock, patch
from datetime import datetime, timezone

import pytest

from howl.db.queries import SenderMatch
from howl.llm.schemas import EmailClassification
from howl.pipeline import classifier
from howl.pipeline.actions import ActionExecutor
from howl.pipeline.processor import EmailProcessor


# ---------------------------------------------------------------------------
# ActionExecutor tests (dry_run mode — no actual HTTP calls)
# ---------------------------------------------------------------------------

def test_action_executor_dry_run_does_not_call_graph(settings, mock_graph):
    from howl.db.models import EmailLog
    assert settings.dry_run is True  # conftest sets dry_run=True

    executor = ActionExecutor(mock_graph, settings)

    log_entry = MagicMock(spec=EmailLog)
    log_entry.mailbox = "test@example.com"
    log_entry.graph_message_id = "msg-001"
    log_entry.sender_name = "Alice"
    log_entry.sender_address = "alice@test.com"
    log_entry.subject = "Test"

    executor.execute(log_entry, "move_customer")
    mock_graph.move_message.assert_not_called()
    mock_graph.get_or_create_folder.assert_not_called()


def test_action_executor_move_customer_live(settings, mock_graph):
    settings = settings.model_copy(update={"dry_run": False})
    from howl.db.models import EmailLog

    executor = ActionExecutor(mock_graph, settings)
    log_entry = MagicMock(spec=EmailLog)
    log_entry.mailbox = "test@example.com"
    log_entry.graph_message_id = "msg-001"
    log_entry.sender_name = "Alice"
    log_entry.sender_address = "alice@test.com"
    log_entry.subject = "Test"

    executor.execute(log_entry, "move_customer")
    mock_graph.get_or_create_folder.assert_called_once_with("test@example.com", settings.folder_customers)
    mock_graph.move_message.assert_called_once()


def test_action_executor_escalate_sends_notification(settings, mock_graph):
    settings = settings.model_copy(update={
        "dry_run": False,
        "notification_webhook_url": "https://hooks.example.com/notify",
    })
    from howl.db.models import EmailLog

    executor = ActionExecutor(mock_graph, settings)
    log_entry = MagicMock(spec=EmailLog)
    log_entry.mailbox = "test@example.com"
    log_entry.graph_message_id = "msg-escalate"
    log_entry.sender_name = "Bob"
    log_entry.sender_address = "bob@client.com"
    log_entry.subject = "URGENT"

    with patch("httpx.post") as mock_post:
        mock_post.return_value = MagicMock(status_code=200, raise_for_status=MagicMock())
        executor.execute(log_entry, "escalate")

    mock_graph.flag_message.assert_called_once()
    mock_post.assert_called_once()
    call_kwargs = mock_post.call_args
    assert call_kwargs[0][0] == "https://hooks.example.com/notify"
    assert "text" in call_kwargs[1]["json"]
    assert call_kwargs[1]["timeout"] == 10


# ---------------------------------------------------------------------------
# Full pipeline integration (all external calls mocked)
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_processor_process_message_happy_path(
    settings, mock_graph, mock_llm, customer_message, customer_match
):
    """Full pipeline: message → DB lookup → LLM → classify → action → log."""
    processor = EmailProcessor(mock_graph, mock_llm, settings)

    inserted_log = MagicMock()
    inserted_log.id = "log-uuid-001"
    inserted_log.retry_count = 0

    with (
        patch("howl.pipeline.processor.db_engine") as mock_db_engine,
        patch("howl.pipeline.processor.queries") as mock_queries,
    ):
        # Set up async session context manager
        mock_session = AsyncMock()
        mock_db_engine.async_session.return_value.__aenter__ = AsyncMock(return_value=mock_session)
        mock_db_engine.async_session.return_value.__aexit__ = AsyncMock(return_value=False)

        mock_queries.is_already_processed = AsyncMock(return_value=False)
        mock_queries.insert_email_log = AsyncMock(return_value=inserted_log)
        mock_queries.lookup_sender = AsyncMock(return_value=customer_match)
        mock_queries.update_email_log = AsyncMock()

        await processor.process_message(customer_message)

    # Verify DB was consulted for idempotency
    mock_queries.is_already_processed.assert_called_once_with(mock_session, customer_message.id)

    # Verify email log was created
    mock_queries.insert_email_log.assert_called_once()

    # Verify sender was looked up
    mock_queries.lookup_sender.assert_called_once_with(mock_session, customer_message.sender_address)

    # Verify LLM was called
    mock_llm.classify.assert_called_once()

    # Verify log was updated with completed status
    final_update_calls = [
        c for c in mock_queries.update_email_log.call_args_list
        if c.kwargs.get("status") == "completed" or (len(c.args) > 2 and "completed" in str(c))
    ]
    # At minimum update_email_log should have been called
    assert mock_queries.update_email_log.call_count >= 2


@pytest.mark.asyncio
async def test_processor_skips_already_processed_message(
    settings, mock_graph, mock_llm, customer_message
):
    processor = EmailProcessor(mock_graph, mock_llm, settings)

    with (
        patch("howl.pipeline.processor.db_engine") as mock_db_engine,
        patch("howl.pipeline.processor.queries") as mock_queries,
    ):
        mock_session = AsyncMock()
        mock_db_engine.async_session.return_value.__aenter__ = AsyncMock(return_value=mock_session)
        mock_db_engine.async_session.return_value.__aexit__ = AsyncMock(return_value=False)
        mock_queries.is_already_processed = AsyncMock(return_value=True)

        await processor.process_message(customer_message)

    # Should not proceed past idempotency check
    mock_llm.classify.assert_not_called()
    mock_graph.move_message.assert_not_called()


@pytest.mark.asyncio
async def test_processor_handles_llm_failure_gracefully(
    settings, mock_graph, mock_llm, customer_message, customer_match
):
    """If LLM throws, the pipeline should catch it and log failure — not crash."""
    mock_llm.classify.side_effect = RuntimeError("Anthropic API timeout")

    processor = EmailProcessor(mock_graph, mock_llm, settings)
    inserted_log = MagicMock()
    inserted_log.id = "log-uuid-002"
    inserted_log.retry_count = 0

    with (
        patch("howl.pipeline.processor.db_engine") as mock_db_engine,
        patch("howl.pipeline.processor.queries") as mock_queries,
    ):
        mock_session = AsyncMock()
        mock_db_engine.async_session.return_value.__aenter__ = AsyncMock(return_value=mock_session)
        mock_db_engine.async_session.return_value.__aexit__ = AsyncMock(return_value=False)
        mock_queries.is_already_processed = AsyncMock(return_value=False)
        mock_queries.insert_email_log = AsyncMock(return_value=inserted_log)
        mock_queries.lookup_sender = AsyncMock(return_value=customer_match)
        mock_queries.update_email_log = AsyncMock()

        # Should NOT raise
        await processor.process_message(customer_message)

    # Should have logged failure
    failed_updates = [
        c for c in mock_queries.update_email_log.call_args_list
        if c.kwargs.get("status") == "failed"
    ]
    assert len(failed_updates) >= 1