# -*- coding: utf-8 -*-
"""任务系统完善：独占/限额/指派/推荐/字段（自包含内存库）。"""
from __future__ import annotations

from contextlib import asynccontextmanager

import pytest
from fastapi import HTTPException
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine

from app.infrastructure.models import Base, TaskCategory  # noqa: F401
from app.infrastructure.repositories import Database
from app.services.task_service import TaskService


@asynccontextmanager
async def _db():
    engine = create_async_engine("sqlite+aiosqlite:///:memory:")
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    Session = async_sessionmaker(engine, expire_on_commit=False)
    async with Session() as session:
        yield Database(session=session)
    await engine.dispose()


def _task(mode="grab", **kw):
    base = dict(task_code="TK-X", title="任务", mode=mode, status="published",
                category="技术开发", delivery_days=10, headcount=0, exclusive=False)
    base.update(kw)
    return base


@pytest.mark.asyncio
async def test_exclusive_claim_rejects_second():
    """独占任务仅一人可接。"""
    async with _db() as db:
        t = await db.tasks.create(_task(exclusive=True, headcount=1))
        a = {"id": "u1", "username": "opc01", "nickname": "阿健"}
        await TaskService(db).claim(t["task_code"], a, source="scan")
        with pytest.raises(HTTPException):
            await TaskService(db).claim(t["task_code"], {"id": "u2"}, "scan")


@pytest.mark.asyncio
async def test_headcount_limit_rejects_overflow():
    """限额任务达上限后拒绝再接。"""
    async with _db() as db:
        t = await db.tasks.create(_task(headcount=2))
        await TaskService(db).claim(t["task_code"], {"id": "u1"}, "scan")
        await TaskService(db).claim(t["task_code"], {"id": "u2"}, "scan")
        with pytest.raises(HTTPException):
            await TaskService(db).claim(t["task_code"], {"id": "u3"}, "scan")


@pytest.mark.asyncio
async def test_assign_marks_claimed():
    """指派：assign 模式 → claimed(claimed_by=taker) + TaskClaim assigned。"""
    async with _db() as db:
        t = await db.tasks.create(_task(mode="assign"))
        await TaskService(db).assign(t["id"], "u_taker", {"id": "u_pub"})
        assert t is not None
        after = await db.tasks.get(t["id"])
        assert after["status"] == "claimed"
        assert after["claimed_by"] == "u_taker"
        claims = await db.task_claims.list_by_task(t["id"])
        assert claims[0]["status"] == "assigned" and claims[0]["claim_source"] == "assign"


@pytest.mark.asyncio
async def test_assign_rejects_non_assign_mode():
    async with _db() as db:
        t = await db.tasks.create(_task(mode="grab"))
        with pytest.raises(HTTPException):
            await TaskService(db).assign(t["id"], "u_taker", {})


@pytest.mark.asyncio
async def test_recommend_then_select():
    """推荐：→ 候选人 recommended → 选定 → claimed + assigned，其余 withdrawn。"""
    async with _db() as db:
        t = await db.tasks.create(_task(mode="recommend"))
        actor = {"id": "u_pub", "username": "pub"}
        recs = await TaskService(db).recommend(t["id"], ["u1", "u2"], actor)
        assert len(recs) == 2
        assert all(r["status"] == "recommended" for r in recs)
        after = await TaskService(db).select_recommend(t["id"], "u1", actor)
        assert after["status"] == "claimed" and after["claimed_by"] == "u1"
        claims = await db.task_claims.list_by_task(t["id"])
        by_user = {c["claimer_user_id"]: c["status"] for c in claims}
        assert by_user == {"u1": "assigned", "u2": "withdrawn"}


@pytest.mark.asyncio
async def test_list_published_returns_new_fields():
    """大屏取数：list_published 返回新字段。"""
    async with _db() as db:
        t = await db.tasks.create(_task(delivery_days=21, headcount=5, exclusive=False, category_id="tc_08"))
        items = await db.tasks.list_published()
        found = next(i for i in items if i["id"] == t["id"])
        for k in ("delivery_days", "headcount", "exclusive", "published_at", "publisher_id", "category_id"):
            assert k in found


@pytest.mark.asyncio
async def test_publish_sets_published_at():
    async with _db() as db:
        t = await db.tasks.create(_task(status="pending"))
        after = await db.tasks.publish(t["id"])
        assert after["status"] == "published" and after["published_at"]


@pytest.mark.asyncio
async def test_category_list_empty_ok():
    async with _db() as db:
        assert await db.task_categories.list() == []