import os
import tempfile

import pytest

from agent.task_queue import PersistentTaskQueue


@pytest.fixture
async def task_queue():
    """임시 SQLite DB로 TaskQueue를 생성한다."""
    fd, db_path = tempfile.mkstemp(suffix=".db")
    os.close(fd)
    queue = PersistentTaskQueue(db_path=db_path)
    await queue.initialize()
    yield queue
    await queue.close()
    os.unlink(db_path)


@pytest.mark.asyncio
async def test_enqueue_and_dequeue(task_queue):
    """작업을 enqueue하고 dequeue한다."""
    task_id = await task_queue.enqueue(
        thread_id="thread-1",
        source="gitea",
        payload={"issue_number": 42, "body": "Fix bug"},
    )
    assert task_id is not None

    task = await task_queue.dequeue()
    assert task is not None
    assert task["thread_id"] == "thread-1"
    assert task["status"] == "running"


@pytest.mark.asyncio
async def test_dequeue_empty_returns_none(task_queue):
    """큐가 비어있으면 None을 반환한다."""
    task = await task_queue.dequeue()
    assert task is None


@pytest.mark.asyncio
async def test_fifo_order(task_queue):
    """FIFO 순서로 dequeue한다."""
    await task_queue.enqueue("thread-1", "gitea", {"order": 1})
    await task_queue.enqueue("thread-2", "discord", {"order": 2})

    task1 = await task_queue.dequeue()
    assert task1["payload"]["order"] == 1

    # Complete first task before dequeuing second
    await task_queue.mark_completed(task1["id"])

    task2 = await task_queue.dequeue()
    assert task2["payload"]["order"] == 2


@pytest.mark.asyncio
async def test_concurrency_limit(task_queue):
    """running 작업이 있으면 dequeue하지 않는다."""
    await task_queue.enqueue("thread-1", "gitea", {"msg": "first"})
    await task_queue.enqueue("thread-2", "gitea", {"msg": "second"})

    task1 = await task_queue.dequeue()
    assert task1 is not None

    task2 = await task_queue.dequeue()
    assert task2 is None


@pytest.mark.asyncio
async def test_mark_completed(task_queue):
    """작업을 completed로 표시한다."""
    await task_queue.enqueue("thread-1", "gitea", {})
    task = await task_queue.dequeue()
    assert task is not None

    await task_queue.mark_completed(task["id"], result={"pr_url": "http://..."})

    await task_queue.enqueue("thread-2", "gitea", {})
    task2 = await task_queue.dequeue()
    assert task2 is not None


@pytest.mark.asyncio
async def test_mark_failed(task_queue):
    """작업을 failed로 표시한다."""
    await task_queue.enqueue("thread-1", "gitea", {})
    task = await task_queue.dequeue()

    await task_queue.mark_failed(task["id"], error="Something broke")

    await task_queue.enqueue("thread-2", "gitea", {})
    task2 = await task_queue.dequeue()
    assert task2 is not None


@pytest.mark.asyncio
async def test_get_pending(task_queue):
    """미처리 작업 목록을 반환한다."""
    await task_queue.enqueue("thread-1", "gitea", {})
    await task_queue.enqueue("thread-2", "discord", {})

    pending = await task_queue.get_pending()
    assert len(pending) == 2


@pytest.mark.asyncio
async def test_has_running_task_for_thread(task_queue):
    """특정 스레드에 실행 중인 작업이 있는지 확인한다."""
    await task_queue.enqueue("thread-1", "gitea", {})
    task = await task_queue.dequeue()  # → running

    assert await task_queue.has_running_task("thread-1") is True
    assert await task_queue.has_running_task("thread-2") is False