import pytest

from data_query_agent.sql_guard import SQLGuard, SQLValidationError


def test_allows_one_select_and_tracks_cte_sources() -> None:
    guard = SQLGuard(frozenset({"loghubods"}))
    refs = guard.validate(
        "WITH daily AS (SELECT uid FROM loghubods.events WHERE ds='20260810') SELECT count(*) FROM daily"
    )
    assert [(ref.project, ref.name) for ref in refs] == [("loghubods", "events")]


@pytest.mark.parametrize(
    "sql",
    [
        "DELETE FROM loghubods.events WHERE ds='20260810'",
        "SELECT * FROM loghubods.events; SELECT * FROM loghubods.users",
        "CREATE TABLE x AS SELECT 1",
    ],
)
def test_rejects_non_read_only_or_multiple_statements(sql: str) -> None:
    with pytest.raises(SQLValidationError):
        SQLGuard(frozenset({"loghubods"})).validate(sql)


def test_rejects_cross_project() -> None:
    with pytest.raises(SQLValidationError, match="跨项目"):
        SQLGuard(frozenset({"loghubods"})).validate("SELECT * FROM other_project.events")


def test_partition_predicate_is_required() -> None:
    with pytest.raises(SQLValidationError, match="分区"):
        SQLGuard.validate_partition_predicates(
            "SELECT uid FROM events WHERE uid > 0", {"events": ["ds"]}
        )
    SQLGuard.validate_partition_predicates(
        "SELECT uid FROM events WHERE ds BETWEEN '20260801' AND '20260810'", {"events": ["ds"]}
    )


def test_each_partitioned_join_source_must_be_filtered() -> None:
    partitions = {"events": ["ds"], "users": ["ds"]}
    with pytest.raises(SQLValidationError, match="users"):
        SQLGuard.validate_partition_predicates(
            "SELECT a.uid FROM events a JOIN users b ON a.uid=b.uid WHERE a.ds='20260810'",
            partitions,
        )
    SQLGuard.validate_partition_predicates(
        "SELECT a.uid FROM events a JOIN users b ON a.uid=b.uid AND b.ds='20260810' WHERE a.ds='20260810'",
        partitions,
    )


def test_video_action_applet_partition_requires_dt_but_not_business() -> None:
    partitions = {"loghubods.video_action_log_applet": ["dt", "business"]}
    SQLGuard.validate_partition_predicates(
        "SELECT mid FROM loghubods.video_action_log_applet v "
        "WHERE v.dt='20260810' AND v.businesstype='videoView'",
        partitions,
    )
    with pytest.raises(SQLValidationError, match=r"video_action_log_applet\(dt\)"):
        SQLGuard.validate_partition_predicates(
            "SELECT mid FROM loghubods.video_action_log_applet v WHERE v.businesstype='videoView'",
            partitions,
        )


def test_offline_product_efficiency_requires_extparams_root_session() -> None:
    bad = """
    SELECT SUBSTR(u.rootsessionid, LENGTH(u.rootsessionid) - 2, 1) bucket,
           COUNT(DISTINCT u.machinecode) dau
    FROM loghubods.useractive_log u
    WHERE u.dt='20260808'
    GROUP BY SUBSTR(u.rootsessionid, LENGTH(u.rootsessionid) - 2, 1)
    """
    with pytest.raises(SQLValidationError, match="extparams.*rootSessionId"):
        SQLGuard.validate_product_efficiency_contract(bad, "offline")

    good = """
    SELECT SUBSTR(root_session_id, LENGTH(root_session_id) - 2, 1) bucket,
           COUNT(DISTINCT machinecode) dau
    FROM (
      SELECT machinecode, GET_JSON_OBJECT(extparams, '$.rootSessionId') root_session_id
      FROM loghubods.useractive_log
      WHERE dt='20260808'
    ) u
    GROUP BY SUBSTR(root_session_id, LENGTH(root_session_id) - 2, 1)
    """
    SQLGuard.validate_product_efficiency_contract(good, "offline")


def test_realtime_product_efficiency_does_not_use_offline_contract() -> None:
    SQLGuard.validate_product_efficiency_contract("SELECT 1", "realtime")


def test_realtime_product_efficiency_rejects_video_business_filter() -> None:
    sql = """
    SELECT mid, GET_JSON_OBJECT(extparams, '$.rootSessionId') root_session_id
    FROM loghubods.video_action_log_flow v
    WHERE v.year='2026' AND v.month='08' AND v.dt='12'
      AND v.business='applet'
      AND v.apptype='4' AND v.businesstype='videoView'
    """
    with pytest.raises(SQLValidationError, match="禁止使用 business"):
        SQLGuard.validate_product_efficiency_contract(sql, "realtime")


@pytest.mark.parametrize(
    "business_filter",
    ["v.business='applet'", "v.business IN ('videoView', 'videoPlay', 'videoShareFriend')"],
)
def test_offline_product_efficiency_rejects_video_business_filter(business_filter: str) -> None:
    sql = f"""
    WITH dau AS (
      SELECT machinecode, GET_JSON_OBJECT(extparams, '$.rootSessionId') root_session_id
      FROM loghubods.useractive_log
      WHERE dt='20260810'
    ), video AS (
      SELECT mid, GET_JSON_OBJECT(extparams, '$.rootSessionId') root_session_id
      FROM loghubods.video_action_log_applet v
      WHERE v.dt='20260810'
        AND {business_filter}
        AND v.businesstype IN ('videoView', 'videoPlay', 'videoShareFriend')
    )
    SELECT COUNT(*) FROM dau JOIN video ON dau.root_session_id=video.root_session_id
    """
    with pytest.raises(SQLValidationError, match="禁止使用 business"):
        SQLGuard.validate_product_efficiency_contract(sql, "offline")