"""pairing.py DTO 单元测试。

覆盖 ``PairingId`` / ``PairingStatus`` / ``DmDecision`` / ``DmPolicy`` /
``PairingRecord`` / ``PairingQuery`` / ``BotLoopBudget`` /
``CreatePairingResult`` / ``BatchPairingCmd`` / ``CleanExpiredPairingsCmd`` /
``PairingStatsQuery`` / ``PairingTrendPoint`` / ``PairingStatsResult`` 的
字段赋值、默认值、不可变语义与 ``__post_init__`` 校验逻辑。
"""

from __future__ import annotations

import dataclasses
from datetime import datetime

import pytest
from yuxi.channels.contract.dtos.channel import ChannelType
from yuxi.channels.contract.dtos.common import Operator, OperatorRole
from yuxi.channels.contract.dtos.pairing import (
    BatchPairingCmd,
    BotLoopBudget,
    CleanExpiredPairingsCmd,
    CreatePairingResult,
    DmDecision,
    DmPolicy,
    PairingId,
    PairingQuery,
    PairingRecord,
    PairingStatsQuery,
    PairingStatsResult,
    PairingStatus,
    PairingTrendPoint,
)
from yuxi.channels.contract.errors import ValidationError

pytestmark = pytest.mark.unit


def _make_operator() -> Operator:
    return Operator(user_id="admin-1", role=OperatorRole.ADMIN_USER)


@pytest.mark.unit
class TestPairingId:
    """配对 ID DTO 测试。"""

    def test_value_is_assigned(self):
        # Act
        pid = PairingId(value="pair-001")
        # Assert
        assert pid.value == "pair-001"


@pytest.mark.unit
class TestPairingStatus:
    """配对状态枚举测试。"""

    def test_str_values(self):
        assert PairingStatus.PENDING == "pending"
        assert PairingStatus.APPROVED == "approved"
        assert PairingStatus.REJECTED == "rejected"
        assert PairingStatus.EXPIRED == "expired"
        assert PairingStatus.REVOKED == "revoked"


@pytest.mark.unit
class TestDmDecision:
    """DM 决策枚举测试。"""

    def test_str_values(self):
        assert DmDecision.ALLOW == "allow"
        assert DmDecision.DENY == "deny"
        assert DmDecision.PENDING_PAIRING == "pending_pairing"
        assert DmDecision.WHITELIST == "whitelist"


@pytest.mark.unit
class TestDmPolicy:
    """DM 策略枚举测试。"""

    def test_str_values(self):
        assert DmPolicy.ALLOW == "allow"
        assert DmPolicy.DENY == "deny"
        assert DmPolicy.PAIRING_REQUIRED == "pairing_required"
        assert DmPolicy.WHITELIST == "whitelist"


@pytest.mark.unit
class TestPairingRecord:
    """配对记录 DTO 测试。"""

    def test_fields_are_assigned_with_defaults(self):
        # Act
        record = PairingRecord(
            pairing_id="pair-1",
            channel_account_id="acc-1",
            peer_id="peer-1",
            status=PairingStatus.PENDING,
        )
        # Assert
        assert record.channel_type is None
        assert record.approver_id is None
        assert record.version == 1

    def test_is_frozen(self):
        # Arrange
        record = PairingRecord(
            pairing_id="p1",
            channel_account_id="a1",
            peer_id="peer",
            status=PairingStatus.PENDING,
        )
        # Act / Assert
        with pytest.raises(dataclasses.FrozenInstanceError):
            record.status = PairingStatus.APPROVED  # type: ignore[misc]


@pytest.mark.unit
class TestPairingQuery:
    """配对查询 DTO 测试。"""

    def test_defaults(self):
        # Act
        query = PairingQuery()
        # Assert
        assert query.limit == 100
        assert query.offset == 0
        assert query.status is None


@pytest.mark.unit
class TestBotLoopBudget:
    """机器人循环预算 DTO 测试。"""

    def test_defaults(self):
        # Act
        budget = BotLoopBudget(max_replies_per_hour=100, cooldown_seconds=60)
        # Assert
        assert budget.current_count == 0
        assert budget.last_reply_at is None


@pytest.mark.unit
class TestBatchPairingCmd:
    """批量配对命令 DTO 测试。"""

    def test_valid_construction(self):
        # Act
        cmd = BatchPairingCmd(
            pairing_ids=("pair-1", "pair-2"),
            operator=_make_operator(),
        )
        # Assert
        assert cmd.reason is None

    def test_empty_pairing_ids_raises(self):
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            BatchPairingCmd(pairing_ids=(), operator=_make_operator())
        assert exc_info.value.field == "pairing_ids"

    def test_too_many_pairing_ids_raises(self):
        # Arrange
        ids = tuple(f"pair-{i}" for i in range(501))
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            BatchPairingCmd(pairing_ids=ids, operator=_make_operator())
        assert exc_info.value.field == "pairing_ids"

    def test_reason_too_long_raises(self):
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            BatchPairingCmd(
                pairing_ids=("pair-1",),
                operator=_make_operator(),
                reason="x" * 513,
            )
        assert exc_info.value.field == "reason"


@pytest.mark.unit
class TestCleanExpiredPairingsCmd:
    """清理过期配对命令 DTO 测试。"""

    def test_defaults(self):
        # Act
        cmd = CleanExpiredPairingsCmd(operator=_make_operator())
        # Assert
        assert cmd.max_count == 500
        assert cmd.channel_type is None

    def test_max_count_below_min_raises(self):
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            CleanExpiredPairingsCmd(operator=_make_operator(), max_count=0)
        assert exc_info.value.field == "max_count"

    def test_max_count_above_max_raises(self):
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            CleanExpiredPairingsCmd(operator=_make_operator(), max_count=1001)
        assert exc_info.value.field == "max_count"


@pytest.mark.unit
class TestPairingStatsQuery:
    """配对统计查询 DTO 测试。"""

    def test_defaults(self):
        # Act
        query = PairingStatsQuery()
        # Assert
        assert query.granularity == "day"

    def test_invalid_granularity_raises(self):
        # Act / Assert
        with pytest.raises(ValidationError) as exc_info:
            PairingStatsQuery(granularity="minute")
        assert exc_info.value.field == "granularity"