"""Unit tests for schedule math: d_hat, overlaps, P0 lock, strong feedback."""

from app.schedule_math import (
    d_hat,
    is_strong_feedback,
    overlaps,
    recompute_priors,
    validate_blocks,
)
from app.schedule_reschedule import rules_backup_reschedule


def test_d_hat_shrinkage() -> None:
    # n=3, mean=40, prior=30, m=3 → 0.5*40 + 0.5*30 = 35
    assert abs(d_hat(40.0, 3, 30.0, m=3) - 35.0) < 1e-9
    assert d_hat(None, 0, 45.0, m=3) == 45.0


def test_strong_feedback() -> None:
    assert is_strong_feedback(
        {"did": "done", "actual_min": 20, "quality": 4, "fun": 3}
    )
    assert not is_strong_feedback({"did": "skipped", "actual_min": 20, "quality": 4, "fun": 3})
    assert not is_strong_feedback({"did": "done", "actual_min": None, "quality": 4, "fun": 3})


def test_overlap_and_p0_lock() -> None:
    assert overlaps("09:00", "10:00", "09:30", "10:30")
    assert not overlaps("09:00", "10:00", "10:00", "11:00")
    blocks = [
        {
            "id": "a",
            "start": "09:00",
            "end": "10:00",
            "planned_min": 60,
            "priority": "P0",
            "locked": True,
        }
    ]
    prev = [{"id": "a", "start": "09:00", "end": "10:00", "priority": "P0", "locked": True}]
    moved = [
        {
            "id": "a",
            "start": "11:00",
            "end": "12:00",
            "planned_min": 60,
            "priority": "P0",
            "locked": True,
        }
    ]
    errors_moved, _ = validate_blocks(moved, previous_p0=prev, allow_p0_move=False)
    errors_ok, _ = validate_blocks(blocks, previous_p0=prev, allow_p0_move=False)
    assert errors_moved
    assert not errors_ok


def test_all_grind_soft_warn() -> None:
    duty = [
        {
            "id": "a",
            "start": "09:00",
            "end": "10:00",
            "planned_min": 60,
            "intent": "duty",
            "priority": "P1",
        }
    ]
    errors, warnings = validate_blocks(
        duty,
        must_include_explore_or_restore=True,
        capacity_hint=0.7,
        hard_explore=False,
    )
    assert not errors
    assert any("all-grind" in w for w in warnings)
    errors_hard, _ = validate_blocks(
        duty,
        must_include_explore_or_restore=True,
        capacity_hint=0.7,
        hard_explore=True,
    )
    assert any("all-grind" in e for e in errors_hard)


def test_recompute_priors() -> None:
    blocks = {
        "b1": {"id": "b1", "kind": "earn_ship", "planned_min": 45},
    }
    feedback = [
        {
            "block_id": "b1",
            "did": "done",
            "actual_min": 50,
            "quality": 4,
            "fun": 2,
            "strong": True,
            "would_repeat": "yes",
        }
    ]
    priors = recompute_priors(feedback, blocks, shrink_k=3)
    assert priors["earn_ship"]["n"] == 1
    assert priors["earn_ship"]["d_hat"] > 0


def test_rules_backup_keeps_p0() -> None:
    blocks = [
        {
            "id": "p0",
            "date": "2026-07-19",
            "start": "08:00",
            "end": "08:30",
            "title": "Food",
            "kind": "food_out",
            "intent": "duty",
            "priority": "P0",
            "planned_min": 30,
            "status": "planned",
            "locked": True,
            "notes": "",
            "version_added": 1,
            "source": "user",
        },
        {
            "id": "p2",
            "date": "2026-07-19",
            "start": "14:00",
            "end": "16:00",
            "title": "Flex",
            "kind": "other",
            "intent": "duty",
            "priority": "P2",
            "planned_min": 120,
            "status": "planned",
            "locked": False,
            "notes": "",
            "version_added": 1,
            "source": "user",
        },
    ]
    out = rules_backup_reschedule(
        blocks,
        day="2026-07-19",
        risk_score=2.0,
        capacity_hint=0.4,
    )
    p0 = next(b for b in out if b.id == "p0")
    assert p0.start == "08:00" and p0.end == "08:30"