"""回归测试: P0-1 — form_slice / stats_slice 主客身份反转。

用 mock Match 对象验证:当某队在历史比赛中是「客队」时,
form_slice 必须正确识别该队当时是客场,赛果应为 L(输),
对手名字和进球数不能反转。
"""
from __future__ import annotations

from unittest.mock import MagicMock

import pytest

from src.llm.context_builder import MatchHeader, SliceResult, form_slice, stats_slice


def _make_team(team_id: int, name: str) -> MagicMock:
    t = MagicMock()
    t.id = team_id
    t.name = name
    t.name_zh = None
    return t


def _make_stats(
    home_xg=1.5,
    away_xg=1.0,
    home_shots=12,
    away_shots=8,
    home_sot=4,
    away_sot=3,
    home_poss=55.0,
    available_at=None,
) -> MagicMock:
    s = MagicMock()
    s.home_xg = home_xg
    s.away_xg = away_xg
    s.home_shots = home_shots
    s.away_shots = away_shots
    s.home_shots_on_target = home_sot
    s.away_shots_on_target = away_sot
    s.home_possession = home_poss
    s.available_at = available_at
    return s


def _make_match(
    match_id: int,
    home_team_id: int,
    away_team_id: int,
    home_goals: int,
    away_goals: int,
    home_name: str = "H",
    away_name: str = "A",
    stats=None,
) -> MagicMock:
    m = MagicMock()
    m.id = match_id
    m.home_team_id = home_team_id
    m.away_team_id = away_team_id
    m.home_goals = home_goals
    m.away_goals = away_goals
    m.stats = stats
    m.home_team = _make_team(home_team_id, home_name)
    m.away_team = _make_team(away_team_id, away_name)
    return m


def _make_header(home_id=1, away_id=2, home_name="利物浦", away_name="阿森纳") -> MatchHeader:
    return MatchHeader(
        match_id=999,
        home_name=home_name,
        away_name=away_name,
        league_name="英超",
        season="2025-2026",
        match_date="2026-01-15 20:00 UTC",
        match_dt=None,
        stage=None,
        home_team_id=home_id,
        away_team_id=away_id,
        league_id=1,
    )


class TestFormSliceHomeAwayIdentity:
    """P0-1: form_slice 必须根据每场历史比赛的真实主客来判断赛果。"""

    @pytest.mark.asyncio
    async def test_home_team_away_loss_shows_L(self):
        """
        场景: 本场利物浦是主队(home_id=1),历史上一场它作为客队 1-3 输给曼城。
        正确输出: L 3-1 vs 曼城 (赛果为输,对手为曼城)
        原bug:   W 3-1 vs 曼城 (把客场输球算成主场赢球)
        """
        header = _make_header(home_id=1, away_id=2, home_name="利物浦", away_name="阿森纳")
        hist_match = _make_match(
            match_id=100,
            home_team_id=5,  # 曼城主场
            away_team_id=1,  # 利物浦客场
            home_goals=3,
            away_goals=1,
            home_name="曼城",
            away_name="利物浦",
        )
        import src.llm.slices.form as cb
        orig_get_form = cb._get_form
        async def mock_get_form(db, team_id, before, *, limit):
            return [hist_match] if team_id == 1 else []
        cb._get_form = mock_get_form
        try:
            result = await form_slice(header, limit=5, before=None, db=MagicMock())
        finally:
            cb._get_form = orig_get_form

        text = str(result)
        assert "L 3-1 vs 曼城" in text, f"期望「L 3-1 vs 曼城」,实际输出:\n{text}"
        assert "W 3-1" not in text, f"不应出现 W 3-1(客场输球不能算主场赢):\n{text}"

    @pytest.mark.asyncio
    async def test_away_team_home_win_shows_W_for_that_team(self):
        """
        场景: 本场阿森纳是客队(away_id=2),历史上一场它作为主队 2-0 赢了切尔西。
        从阿森纳视角: is_home=True → W 2-0 vs 切尔西。
        原bug: side 固定为 "away" → _outcome(2,0,"away") = L → 输出 L 2-0 vs 切尔西(反转!)
        """
        header = _make_header(home_id=1, away_id=2, home_name="利物浦", away_name="阿森纳")
        hist_match = _make_match(
            match_id=101,
            home_team_id=2,  # 阿森纳主场
            away_team_id=4,  # 切尔西客场
            home_goals=2,
            away_goals=0,
            home_name="阿森纳",
            away_name="切尔西",
        )
        import src.llm.slices.form as cb
        orig_get_form = cb._get_form
        async def mock_get_form(db, team_id, before, *, limit):
            return [hist_match] if team_id == 2 else []
        cb._get_form = mock_get_form
        try:
            result = await form_slice(header, limit=5, before=None, db=MagicMock())
        finally:
            cb._get_form = orig_get_form

        text = str(result)
        assert "W 2-0 vs 切尔西" in text, f"期望「W 2-0 vs 切尔西」,实际输出:\n{text}"
        assert "L 2-0 vs 切尔西" not in text, f"不应出现 L 2-0(主场赢球不能算客场输):\n{text}"


class TestStatsSliceHomeAwayIdentity:
    """P0-1: stats_slice 进球/失球/xG 必须按历史比赛真实主客取值。"""

    @pytest.mark.asyncio
    async def test_home_team_away_match_goals_not_swapped(self):
        """
        场景: 本场利物浦是主队,历史上一场它作为客队 1-3 输给曼城(xG 0.8 vs 2.5)。
        从利物浦视角: 进球=1(away_goals), 失球=3(home_goals), xG=0.8(away_xg)。
        原bug: side="home" → 进球=3, 失球=1, xG=2.5 —— 全部反了!
        """
        header = _make_header(home_id=1, away_id=2, home_name="利物浦", away_name="阿森纳")
        hist_match = _make_match(
            match_id=200,
            home_team_id=5,  # 曼城主场
            away_team_id=1,  # 利物浦客场
            home_goals=3,
            away_goals=1,
            home_name="曼城",
            away_name="利物浦",
            stats=_make_stats(home_xg=2.5, away_xg=0.8, home_shots=15, away_shots=5,
                              home_sot=6, away_sot=2, home_poss=60.0),
        )
        import src.llm.slices.stats as cb
        orig_get_form = cb._get_form
        async def mock_get_form(db, team_id, before, *, limit):
            return [hist_match] if team_id == 1 else []
        cb._get_form = mock_get_form
        try:
            result = await stats_slice(header, limit=10, before=None, db=MagicMock())
        finally:
            cb._get_form = orig_get_form

        text = str(result)
        # 利物浦客场 1-3 输: 进球 1, 失球 3
        assert "场均进球 1.00" in text, f"期望场均进球 1.00,实际输出:\n{text}"
        assert "场均失球 3.00" in text, f"期望场均失球 3.00,实际输出:\n{text}"
        # 原bug: 进球 3, 失球 1 (反了)
        assert "场均进球 3.00" not in text, f"不应出现场均进球 3.00(反转):\n{text}"
        # xG: 利物浦 away_xg=0.8
        assert "场均 xG 0.80" in text, f"期望场均 xG 0.80,实际输出:\n{text}"
        # shots: 利物浦 away_shots=5
        assert "场均射门 5.0" in text, f"期望场均射门 5.0,实际输出:\n{text}"