"""任务域：状态机、乐观锁、视图、搜索、租户隔离。

这些用例覆盖的是"用户能感觉到的错"，不是代码覆盖率：
状态乱跳、两个人同时改、别人的任务突然出现、今天的清单里混进明天的任务。
"""

from __future__ import annotations

from datetime import datetime, timedelta, timezone
from zoneinfo import ZoneInfo

from httpx import AsyncClient

from .conftest import create_workspace, login, unwrap

TZ = ZoneInfo("Asia/Shanghai")


def items_url(ws_id: str) -> str:
    return f"/api/v1/workspaces/{ws_id}/items"


async def _new_item(client: AsyncClient, user: dict, ws_id: str, **overrides) -> dict:
    payload = {"title": "写周报", **overrides}
    return unwrap(await client.post(items_url(ws_id), json=payload, headers=user["headers"]))


async def test_create_task_defaults_to_inbox(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"])

    assert item["status"] == "inbox"
    assert item["kind"] == "task"
    assert item["version"] == 1
    assert item["creator_id"] == user["user_id"]

    inbox = unwrap(
        await client.get(items_url(ws["id"]), params={"view": "inbox"}, headers=user["headers"])
    )
    assert [i["id"] for i in inbox["items"]] == [item["id"]]


async def test_status_machine_happy_path_sets_completed_at(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"])

    for target in ("todo", "doing", "done"):
        item = unwrap(
            await client.post(
                f"{items_url(ws['id'])}/{item['id']}/status",
                json={"status": target, "version": item["version"]},
                headers=user["headers"],
            )
        )
        assert item["status"] == target
    assert item["completed_at"] is not None

    # 重开：completed_at 必须被清掉，否则"完成时间"会一直挂着
    item = unwrap(
        await client.post(
            f"{items_url(ws['id'])}/{item['id']}/status",
            json={"status": "todo", "version": item["version"]},
            headers=user["headers"],
        )
    )
    assert item["status"] == "todo"
    assert item["completed_at"] is None


async def test_illegal_transition_is_rejected(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"])

    resp = await client.post(
        f"{items_url(ws['id'])}/{item['id']}/status",
        json={"status": "done", "version": item["version"]},  # inbox 不能直接 done
        headers=user["headers"],
    )
    body = resp.json()
    assert body["code"] == 5002
    assert body["data"]["from"] == "inbox"
    assert "todo" in body["data"]["allowed"]


async def test_stale_version_is_rejected_not_silently_overwritten(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"])

    first = unwrap(
        await client.patch(
            f"{items_url(ws['id'])}/{item['id']}",
            json={"version": item["version"], "title": "写周报（周四）"},
            headers=user["headers"],
        )
    )
    assert first["version"] == item["version"] + 1

    resp = await client.patch(
        f"{items_url(ws['id'])}/{item['id']}",
        json={"version": item["version"], "title": "覆盖别人的修改"},
        headers=user["headers"],
    )
    body = resp.json()
    assert resp.status_code == 409
    assert body["code"] == 4009
    assert body["data"]["current_version"] == first["version"]


async def test_other_tenant_cannot_read_or_list_my_task(client: AsyncClient) -> None:
    me = await login(client)
    other = await login(client)
    ws = await create_workspace(client, me, "我的空间")
    other_ws = await create_workspace(client, other, "别人的空间")
    item = await _new_item(client, me, ws["id"], title="机密方案")

    resp = await client.get(f"{items_url(ws['id'])}/{item['id']}", headers=other["headers"])
    assert resp.json()["code"] == 3003  # 不是成员，连工作区都进不去

    listed = unwrap(
        await client.get(
            items_url(other_ws["id"]), params={"view": "all"}, headers=other["headers"]
        )
    )
    assert listed["items"] == []


async def test_search_by_keyword_and_filter_by_tag(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    await _new_item(client, user, ws["id"], title="整理季度合同", tag_names=["合同", "法务"])
    await _new_item(client, user, ws["id"], title="买咖啡豆")

    found = unwrap(
        await client.get(
            items_url(ws["id"]), params={"q": "合同", "view": "all"}, headers=user["headers"]
        )
    )
    assert [i["title"] for i in found["items"]] == ["整理季度合同"]
    assert {t["name"] for t in found["items"][0]["tags"]} == {"合同", "法务"}

    tagged = unwrap(
        await client.get(
            items_url(ws["id"]), params={"tag": "法务", "view": "all"}, headers=user["headers"]
        )
    )
    assert [i["title"] for i in tagged["items"]] == ["整理季度合同"]

    all_tags = unwrap(
        await client.get(f"/api/v1/workspaces/{ws['id']}/tags", headers=user["headers"])
    )
    assert {t["name"] for t in all_tags["items"]} == {"合同", "法务"}


async def test_today_view_uses_local_timezone_boundaries(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")

    now_local = datetime.now(TZ)
    today_2330 = now_local.replace(hour=23, minute=30, second=0, microsecond=0)
    tomorrow_0030 = (now_local + timedelta(days=1)).replace(
        hour=0, minute=30, second=0, microsecond=0
    )

    await _new_item(
        client,
        user,
        ws["id"],
        title="今晚交",
        status="todo",
        due_at=today_2330.astimezone(timezone.utc).isoformat(),
    )
    await _new_item(
        client,
        user,
        ws["id"],
        title="明早交",
        status="todo",
        due_at=tomorrow_0030.astimezone(timezone.utc).isoformat(),
    )

    today = unwrap(
        await client.get(items_url(ws["id"]), params={"view": "today"}, headers=user["headers"])
    )
    assert [i["title"] for i in today["items"]] == ["今晚交"]


async def test_soft_delete_hides_from_lists_but_keeps_row(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"], status="todo")

    unwrap(
        await client.delete(
            f"{items_url(ws['id'])}/{item['id']}",
            params={"version": item["version"]},
            headers=user["headers"],
        )
    )
    active = unwrap(
        await client.get(items_url(ws["id"]), params={"view": "active"}, headers=user["headers"])
    )
    assert active["items"] == []

    deleted = unwrap(
        await client.get(items_url(ws["id"]), params={"view": "deleted"}, headers=user["headers"])
    )
    assert [i["id"] for i in deleted["items"]] == [item["id"]]


async def test_comments_and_activity_stream(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    item = await _new_item(client, user, ws["id"])

    unwrap(
        await client.post(
            f"{items_url(ws['id'])}/{item['id']}/status",
            json={"status": "todo", "version": item["version"]},
            headers=user["headers"],
        )
    )
    unwrap(
        await client.post(
            f"{items_url(ws['id'])}/{item['id']}/comments",
            json={"body_md": "先找财务要模板"},
            headers=user["headers"],
        )
    )

    detail = unwrap(
        await client.get(f"{items_url(ws['id'])}/{item['id']}", headers=user["headers"])
    )
    actions = [a["action"] for a in detail["activities"]]
    assert actions[0] == "commented"
    assert "status_changed" in actions
    assert "created" in actions

    status_change = next(a for a in detail["activities"] if a["action"] == "status_changed")
    assert status_change["payload"] == {"from": "inbox", "to": "todo"}


async def test_cursor_pagination_does_not_repeat_rows(client: AsyncClient) -> None:
    user = await login(client)
    ws = await create_workspace(client, user, "个人")
    for index in range(3):
        await _new_item(client, user, ws["id"], title=f"任务{index}", status="todo")

    first = unwrap(
        await client.get(
            items_url(ws["id"]), params={"view": "all", "limit": 2}, headers=user["headers"]
        )
    )
    assert len(first["items"]) == 2
    assert first["has_more"] is True
    assert first["next_cursor"]

    second = unwrap(
        await client.get(
            items_url(ws["id"]),
            params={"view": "all", "limit": 2, "cursor": first["next_cursor"]},
            headers=user["headers"],
        )
    )
    ids_first = {i["id"] for i in first["items"]}
    ids_second = {i["id"] for i in second["items"]}
    assert ids_first.isdisjoint(ids_second)
    assert len(ids_second) == 1
    assert second["has_more"] is False