"""回归测试: 比赛列表游标分页方向修复。

验证:
  - status=scheduled 时,游标条件为「大于」(ASC 方向)
  - 其它 status 时,游标条件为「小于」(DESC 方向)
  - 无 cursor 时行为不变
"""
from __future__ import annotations

from datetime import datetime, timezone

import pytest
from sqlalchemy import select

from src.db.models import Match


class TestCursorPaginationDirection:
    """验证游标条件方向与排序方向一致。"""

    def _build_query(self, status=None, cursor=None):
        """复现 list_matches 的查询构造逻辑,返回 where 条件列表。"""
        q = select(Match)

        if cursor:
            last_date_str, last_id_str = cursor.split("|", 1)
            last_date = datetime.fromisoformat(last_date_str)
            last_id = int(last_id_str)
            if status == "scheduled":
                q = q.where(
                    (Match.match_date > last_date) |
                    ((Match.match_date == last_date) & (Match.id > last_id))
                )
            else:
                q = q.where(
                    (Match.match_date < last_date) |
                    ((Match.match_date == last_date) & (Match.id < last_id))
                )

        if status:
            q = q.where(Match.match_status == status)

        if status == "scheduled":
            order = (Match.match_date.asc(), Match.id.asc())
        else:
            order = (Match.match_date.desc(), Match.id.desc())

        return q.order_by(*order)

    def test_scheduled_uses_greater_than(self):
        """scheduled + cursor: 应使用 > 条件(ASC 方向)。"""
        q = self._build_query(
            status="scheduled",
            cursor="2026-01-15T15:00:00|100"
        )
        sql = str(q)
        assert ">" in sql, f"scheduled 游标应使用 >,SQL: {sql}"
        assert "<" not in sql or "match_date <" not in sql, f"不应出现 < 条件"

    def test_other_status_uses_less_than(self):
        """finished + cursor: 应使用 < 条件(DESC 方向)。"""
        q = self._build_query(
            status="finished",
            cursor="2026-01-15T15:00:00|100"
        )
        sql = str(q)
        assert "<" in sql, f"finished 游标应使用 <,SQL: {sql}"
        assert "match_date >" not in sql, f"不应出现 > 条件"

    def test_no_cursor_no_direction(self):
        """无 cursor 时不应有游标条件。"""
        q = self._build_query(status="scheduled", cursor=None)
        sql = str(q)
        # 应无 match_date 比较条件(只有 status filter)
        assert "match_date >" not in sql
        assert "match_date <" not in sql

    def test_scheduled_order_is_asc(self):
        """scheduled 排序应为 ASC。"""
        q = self._build_query(status="scheduled", cursor=None)
        sql = str(q)
        assert "ASC" in sql, f"scheduled 应 ASC 排序,SQL: {sql}"
        assert "DESC" not in sql, f"不应出现 DESC"

    def test_finished_order_is_desc(self):
        """finished 排序应为 DESC。"""
        q = self._build_query(status="finished", cursor=None)
        sql = str(q)
        assert "DESC" in sql, f"finished 应 DESC 排序,SQL: {sql}"