# ============================================================
# 偏好学习升级黄金测试（plan.md §8.3 / 矩阵 66 行）
# 覆盖：项目隔离、解释（得分明细+冷启动/不确定度）、重置、向后兼容。
# ============================================================
from __future__ import annotations

from pathlib import Path

from server.knowledge.preferences import PreferenceStore


def _store(tmp_path: Path) -> PreferenceStore:
    return PreferenceStore(path=str(tmp_path / "pref.json"))


def test_preference_project_isolation(tmp_path: Path):
    """项目隔离：不同项目各算各的分，个人全局不受项目样本影响。"""
    ps = _store(tmp_path)
    ps.record("DELIVERY_FIRST", source="schedule.run", actor="u1", project_id="p1")
    ps.record("DELIVERY_FIRST", source="schedule.run", actor="u1", project_id="p1")
    ps.record("CAPACITY_BALANCE", source="scenario.apply", actor="u1", project_id="p2")
    ps.record("CAPACITY_BALANCE", source="scenario.apply", actor="u1", project_id="p2")
    d1, s1 = ps.preferred_strategy(project_id="p1")
    d2, s2 = ps.preferred_strategy(project_id="p2")
    assert d1 == "DELIVERY_FIRST" and s1["DELIVERY_FIRST"] == 2
    assert d2 == "CAPACITY_BALANCE" and s2["CAPACITY_BALANCE"] == 4
    d0, s0 = ps.preferred_strategy()                  # 个人全局（无项目）
    assert d0 == "COMPREHENSIVE" and s0 == {}


def test_preference_explain_cold_and_high(tmp_path: Path):
    """解释：无样本 → cold；样本充足 → high 且带得分明细与依据条数。"""
    ps = _store(tmp_path)
    cold = ps.explain()
    assert cold["confidence"] == "cold"
    assert cold["sampleCount"] == 0
    for _ in range(4):
        ps.record("DELIVERY_FIRST", source="scenario.apply", actor="u1", project_id="p1")
    warm = ps.explain(project_id="p1")
    assert warm["confidence"] == "high"
    assert warm["strategy"] == "DELIVERY_FIRST"
    assert warm["sampleCount"] == 4
    assert warm["scores"]["DELIVERY_FIRST"] == 8


def test_preference_explain_tie_is_medium(tmp_path: Path):
    """不确定度：并列最高分 → medium（偏好尚不明确）。"""
    ps = _store(tmp_path)
    ps.record("DELIVERY_FIRST", source="scenario.apply", actor="u1", project_id="p1")
    ps.record("CAPACITY_BALANCE", source="scenario.apply", actor="u1", project_id="p1")
    ex = ps.explain(project_id="p1")
    assert ex["confidence"] == "medium"


def test_preference_reset_by_project(tmp_path: Path):
    """重置：只清指定项目样本，其他项目与个人全局保留。"""
    ps = _store(tmp_path)
    ps.record("DELIVERY_FIRST", source="schedule.run", actor="u1", project_id="p1")
    ps.record("CAPACITY_BALANCE", source="schedule.run", actor="u1", project_id="p2")
    ps.record("FIFO", source="schedule.run", actor="u1")
    removed = ps.reset(project_id="p1")
    assert removed == 1
    assert len(ps._samples_for("p1")) == 0
    assert len(ps._samples_for("p2")) == 1
    assert len(ps._samples_for(None)) == 1            # 个人全局保留