"""TaskTypeStrategy Protocol 与 BaseTaskTypeStrategy 单元测试。"""

from __future__ import annotations

import random

import pytest

from app.question_gen.families import (
    ENUMERATION_FAMILY,
    REASONING_FAMILY,
    RETRIEVAL_FAMILY,
    SPATIAL_FAMILY,
    VISUAL_FAMILY,
)
from app.question_gen.strategy import (
    BaseTaskTypeStrategy,
    SubPattern,
    get_strategy,
    register_strategy,
)


class TestBaseTaskTypeStrategy:
    """BaseTaskTypeStrategy 封装 family 行为。"""

    def test_task_type_and_strategy_name(self):
        """task_type 和 strategy_name 正确返回。"""
        s = BaseTaskTypeStrategy(task_type="Object Recognition", family=RETRIEVAL_FAMILY)
        assert s.task_type == "Object Recognition"
        assert s.strategy_name == "RETRIEVAL"

    def test_sampling_from_family(self):
        """采样参数从绑定的 family 读取。"""
        s = BaseTaskTypeStrategy(task_type="Temporal Reasoning", family=ENUMERATION_FAMILY)
        assert s.sampling_level == 1
        assert s.sampling_constraint.min_l3_nodes == 5

    def test_skill_target_from_family(self):
        """skill_target 从 family 读取。"""
        s = BaseTaskTypeStrategy(task_type="Action Reasoning", family=REASONING_FAMILY)
        assert s.skill_target == "M2"

    def test_leak_probe_template(self):
        """leak_probe_template 从 family.leak_profile 读取。"""
        s = BaseTaskTypeStrategy(task_type="Spatial Reasoning", family=SPATIAL_FAMILY)
        assert s.leak_probe_template == "gate_leak_spatial.md"

    def test_prompt_template_from_family(self):
        """prompt_template 从 family 读取。"""
        s = BaseTaskTypeStrategy(task_type="OCR Problems", family=VISUAL_FAMILY)
        assert s.prompt_template == "visual.md"

    def test_select_sub_pattern_returns_none(self):
        """BaseTaskTypeStrategy 无子模式。"""
        s = BaseTaskTypeStrategy(task_type="Object Recognition", family=RETRIEVAL_FAMILY)
        rng = random.Random(42)
        assert s.select_sub_pattern(rng) is None

    def test_extra_gates_returns_empty(self):
        """BaseTaskTypeStrategy 无额外 gate。"""
        s = BaseTaskTypeStrategy(task_type="Object Recognition", family=RETRIEVAL_FAMILY)
        assert s.extra_gates(None) == []


class TestSamplingLevelMapping:
    """BaseTaskTypeStrategy 的 sampling_level 从 _TASK_TYPE_TO_LEVEL 读取。"""

    def test_l3_types(self):
        """L3 题型。"""
        for tt in ("Object Recognition",):
            s = BaseTaskTypeStrategy(task_type=tt, family=RETRIEVAL_FAMILY)
            assert s.sampling_level == 3, f"{tt} should be L3"

    def test_l2_types(self):
        """L2 题型。"""
        s = BaseTaskTypeStrategy(task_type="Action Reasoning", family=REASONING_FAMILY)
        assert s.sampling_level == 2

    def test_l1_types(self):
        """L1 题型。"""
        s = BaseTaskTypeStrategy(task_type="Temporal Reasoning", family=ENUMERATION_FAMILY)
        assert s.sampling_level == 1


class TestStrategyRegistry:
    """注册表查找。"""

    def test_get_unregistered_returns_base(self):
        """未注册题型返回 BaseTaskTypeStrategy。"""
        s = get_strategy("Spatial Reasoning")
        assert isinstance(s, BaseTaskTypeStrategy)
        assert s.task_type == "Spatial Reasoning"

    def test_register_and_get(self):
        """注册后 get 返回注册的策略。"""
        custom = BaseTaskTypeStrategy(task_type="Object Recognition", family=RETRIEVAL_FAMILY)
        register_strategy(custom)
        assert get_strategy("Object Recognition") is custom


class TestSubPattern:
    """SubPattern 数据类。"""

    def test_frozen(self):
        """SubPattern 不可变。"""
        sp = SubPattern(
            name="test",
            weight=0.5,
            sampling_level_override=None,
            constraint_override=None,
            instruction="test instruction",
            positive_examples=[],
            negative_examples=[],
            distractor_rules="",
        )
        with pytest.raises(AttributeError):
            sp.name = "changed"