"""P1-B 回归测试: 非法 cursor → 400 + code=INVALID_CURSOR。

运行: pytest tests/test_p1_b_invalid_cursor.py -v
(_parse_cursor 为纯函数,无 DB/网络依赖;HTTP 层仅测非法格式。)
"""
from __future__ import annotations

from datetime import datetime, timezone

import pytest
from fastapi import HTTPException
from fastapi.testclient import TestClient

from src.api.app import app
from src.api.deps import require_admin
from src.api.routes.matches import _parse_cursor


class TestParseCursorPure:
    """P1-B 纯函数:_parse_cursor 解析与非法校验。"""

    def test_valid_cursor(self):
        d, mid = _parse_cursor("2026-01-01T15:00:00+00:00|42")
        assert d == datetime(2026, 1, 1, 15, 0, tzinfo=timezone.utc)
        assert mid == 42

    def test_missing_pipe_raises_400(self):
        with pytest.raises(HTTPException) as ei:
            _parse_cursor("no-pipe-here")
        assert ei.value.status_code == 400
        assert ei.value.detail["code"] == "INVALID_CURSOR"

    def test_empty_date_raises_400(self):
        with pytest.raises(HTTPException) as ei:
            _parse_cursor("|5")
        assert ei.value.status_code == 400
        assert ei.value.detail["code"] == "INVALID_CURSOR"

    def test_non_numeric_id_raises_400(self):
        with pytest.raises(HTTPException) as ei:
            _parse_cursor("2026-01-01T00:00:00+00:00|abc")
        assert ei.value.status_code == 400
        assert ei.value.detail["code"] == "INVALID_CURSOR"

    def test_invalid_date_raises_400(self):
        with pytest.raises(HTTPException) as ei:
            _parse_cursor("not-a-date|1")
        assert ei.value.status_code == 400
        assert ei.value.detail["code"] == "INVALID_CURSOR"

    def test_extra_pipe_raises_400(self):
        """含额外 | 时 id 部分为 "42|extra",int() 失败 → 400。"""
        with pytest.raises(HTTPException) as ei:
            _parse_cursor("2026-01-01T15:00:00+00:00|42|extra")
        assert ei.value.status_code == 400
        assert ei.value.detail["code"] == "INVALID_CURSOR"


class TestInvalidCursorHTTP:
    """P1-B HTTP 层:非法 cursor → 400 + code=INVALID_CURSOR。"""

    @pytest.fixture
    def client(self):
        app.dependency_overrides[require_admin] = lambda: None
        return TestClient(app)

    def test_malformed_cursor_400(self, client):
        resp = client.get("/api/v1/matches?cursor=garbage")
        assert resp.status_code == 400
        assert resp.json()["detail"]["code"] == "INVALID_CURSOR"

    def test_missing_id_400(self, client):
        resp = client.get("/api/v1/matches?cursor=2026-01-01T00:00:00|")
        assert resp.status_code == 400
        assert resp.json()["detail"]["code"] == "INVALID_CURSOR"