"""Phase 0 tests for the CutPlan model."""
import json

from woodshop.cutplan import CutPlan, ShopSettings, build_cut_plan, validate_cut_plan
from woodshop.scene import Scene


def test_lumber_plan_packs_and_validates():
    s = Scene()
    for _ in range(3):
        s.place("2x4", 40)
    plan = build_cut_plan(s)
    sticks = [sp for sp in plan.stock_pieces if not sp.is_sheet]
    assert len(sticks) == 2
    assert sum(len(sp.placements) for sp in sticks) == 3
    assert plan.score["stock_count"] == 2
    assert validate_cut_plan(plan) == []


def test_kerf_prevents_two_48_in_one_stick():
    s = Scene()
    s.place("2x4", 48)
    s.place("2x4", 48)
    assert build_cut_plan(s).score["stock_count"] == 2


def test_tenon_extends_cut_item_length():
    s = Scene()
    s.place("2x4", 24)
    s.add_feature("p1", "tenon", face="end_b", depth_in=2)
    item = build_cut_plan(s).items[0]
    assert item.length_in == 26 and "tenon" in item.note


def test_plywood_plan_and_validate():
    s = Scene()
    s.place("ply-3/4", 40, width_in=20)
    s.place("ply-3/4", 40, width_in=20)
    plan = build_cut_plan(s)
    sheets = [sp for sp in plan.stock_pieces if sp.is_sheet]
    assert len(sheets) == 1 and len(sheets[0].placements) == 2
    assert validate_cut_plan(plan) == []


def test_oversize_lumber_warns_and_is_unplaced():
    s = Scene()
    s.place("2x4", 120)                     # longer than a 96" stick
    plan = build_cut_plan(s)
    assert plan.unplaced and plan.warnings
    assert validate_cut_plan(plan) == []    # flagged, so still valid


def test_stable_ids_present():
    s = Scene()
    s.place("2x4", 40)
    plan = build_cut_plan(s)
    assert all(it.id for it in plan.items)
    assert all(sp.id for sp in plan.stock_pieces)
    assert all(p.id for sp in plan.stock_pieces for p in sp.placements)


def test_json_roundtrip():
    s = Scene()
    s.place("2x4", 40)
    s.place("ply-3/4", 40, width_in=20)
    plan = build_cut_plan(s)
    plan2 = CutPlan.from_dict(json.loads(json.dumps(plan.to_dict())))
    assert plan2.settings.kerf_in == plan.settings.kerf_in
    assert [sp.id for sp in plan2.stock_pieces] == [sp.id for sp in plan.stock_pieces]
    assert plan2.score["stock_count"] == plan.score["stock_count"]
    assert validate_cut_plan(plan2) == []


def test_plywood_rotation_fits_panel():
    s = Scene()
    s.place("ply-3/4", 30, width_in=60)     # 60" wide > 48" sheet — needs rotating
    plan = build_cut_plan(s)                 # rotation allowed by default
    sheets = [sp for sp in plan.stock_pieces if sp.is_sheet]
    assert len(sheets) == 1
    p = sheets[0].placements[0]
    assert p.rotated and p.len_in == 60 and p.wid_in == 30
    assert validate_cut_plan(plan) == []


def test_rotation_disabled_flags_unfit():
    s = Scene()
    s.place("ply-3/4", 30, width_in=60)
    plan = build_cut_plan(s, settings=ShopSettings(allow_plywood_rotation=False))
    assert plan.unplaced and plan.warnings


def test_best_cut_plan_is_no_worse():
    from woodshop.cutplan import _plan_key, best_cut_plan
    s = Scene()
    for ln in (50, 46, 30, 30, 20):
        s.place("2x4", ln)
    best = best_cut_plan(s)
    base = build_cut_plan(s, strategy="decreasing")
    assert _plan_key(best) <= _plan_key(base)
    assert best.strategy == "optimized"
    assert validate_cut_plan(best) == []


def test_custom_settings_kerf():
    s = Scene()
    s.place("2x4", 48)
    s.place("2x4", 48)
    # zero kerf -> both 48" fit in one 96" stick
    assert build_cut_plan(s, settings=ShopSettings(kerf_in=0.0)).score["stock_count"] == 1