pf1e-simulator/tests/test_monster_loader.py

"""Golden and validation tests for the hand-authored monster JSON loader."""

from __future__ import annotations

import json
from pathlib import Path

import pytest

from pf1e_simulator.dice import DiceExpr
from pf1e_simulator.loaders.monster import MonsterLoadError, load_monster

MONSTERS_DIR = Path(__file__).resolve().parents[1] / "data" / "monsters"
PCS_DIR = Path(__file__).resolve().parents[1] / "data" / "pcs"


@pytest.mark.parametrize(
    "stem",
    ["esha", "harvie", "ierlieth", "jeanne", "misty", "nairda", "oni", "tammara"],
)
def test_pc_sheet_loads(stem: str) -> None:
    """Every transposed PC sheet loads through the strict monster JSON path."""
    combatant = load_monster(PCS_DIR / f"{stem}.json")
    assert combatant.attacks
    assert combatant.hp_max >= 1
    assert combatant.ac.total >= 10
    assert combatant.speed_land_ft >= 0


def test_pc_sheets_golden_spots() -> None:
    esha = load_monster(PCS_DIR / "esha.json")
    assert esha.name == "Esha Randu"
    assert [a.name for a in esha.attacks] == [
        "Lance",
        "Composite Shortbow +3",
        "Earth Breaker",
    ]
    assert esha.attacks[0].reach_ft == 10
    assert esha.attacks[1].range_increment_ft == 70

    harvie = load_monster(PCS_DIR / "harvie.json")
    assert harvie.size == "Small"
    assert harvie.speed_fly_ft == 80

    oni = load_monster(PCS_DIR / "oni.json")
    assert "Pioche" in oni.notes
    assert "Weapon" in oni.notes

    tammara = load_monster(PCS_DIR / "tammara.json")
    assert tammara.initiative_mod == 7


def _write(tmp_path: Path, payload: dict[str, object]) -> Path:
    target = tmp_path / "monster.json"
    target.write_text(json.dumps(payload), encoding="utf-8")
    return target


def _valid_payload() -> dict[str, object]:
    return {
        "name": "Testling",
        "level": 1,
        "abilities": {
            "str_score": 10,
            "dex_score": 10,
            "con_score": 10,
            "int_score": 10,
            "wis_score": 10,
            "cha_score": 10,
        },
        "hp_max": 5,
        "ac": {"total": 12, "touch": 10, "flat_footed": 12},
        "bab": 0,
        "initiative_mod": 1,
        "speed_land_ft": 20,
        "saves": {"fort": 1, "ref": 2, "will": 3},
        "attacks": [
            {
                "name": "Bite",
                "kind": "melee",
                "attack_bonus": 1,
                "damage": [{"formula": "1d4", "types": ["piercing"]}],
            }
        ],
    }


def test_goblin_golden() -> None:
    goblin = load_monster(MONSTERS_DIR / "goblin.json")
    assert goblin.name == "Goblin"
    assert goblin.size == "Small"
    assert goblin.cr == "1/3"
    assert goblin.xp == 135
    assert goblin.hp_max == 6
    assert goblin.ac.total == 16
    assert goblin.ac.touch == 13
    assert goblin.ac.flat_footed == 14
    assert goblin.initiative_mod == 6
    assert goblin.speed_land_ft == 30
    assert goblin.saves.fort == 3
    assert goblin.saves.ref == 2
    assert goblin.saves.will == -1
    assert goblin.abilities.dex_score == 15
    assert len(goblin.attacks) == 2

    sword = next(a for a in goblin.attacks if a.name == "short sword")
    assert sword.kind == "melee"
    assert sword.attack_bonus == 2
    assert sword.crit_range == 19
    assert sword.crit_mult == 2
    assert sword.damage[0].formula == DiceExpr(count=1, sides=4)

    bow = next(a for a in goblin.attacks if a.name == "short bow")
    assert bow.kind == "ranged"
    assert bow.attack_bonus == 4
    assert bow.crit_mult == 3
    assert bow.range_increment_ft == 60


def test_orc_golden() -> None:
    orc = load_monster(MONSTERS_DIR / "orc.json")
    assert orc.name == "Orc"
    assert orc.size == "Medium"
    assert orc.hp_max == 6
    assert orc.ac.total == 13
    assert "Ferocity" in orc.notes  # documented Phase 0 omission

    falchion = next(a for a in orc.attacks if a.name == "falchion")
    assert falchion.attack_bonus == 5
    assert falchion.damage[0].formula == DiceExpr(count=2, sides=4)
    assert falchion.damage_bonus == 4
    assert falchion.crit_range == 18
    assert falchion.crit_mult == 2

    javelin = next(a for a in orc.attacks if a.name == "javelin")
    assert javelin.kind == "ranged"
    assert javelin.range_increment_ft == 30
    assert javelin.damage_bonus == 3


def test_monster_attack_ids_auto_assigned() -> None:
    goblin = load_monster(MONSTERS_DIR / "goblin.json")
    assert [a.id for a in goblin.attacks] == ["goblin:0", "goblin:1"]


def test_valid_minimal_monster_loads(tmp_path: Path) -> None:
    monster = load_monster(_write(tmp_path, _valid_payload()))
    assert monster.name == "Testling"
    assert monster.attacks[0].id == "monster:0"  # falls back to file stem


def test_rejects_crit_mult_one(tmp_path: Path) -> None:
    payload = _valid_payload()
    payload["attacks"] = [
        {
            "name": "Bite",
            "kind": "melee",
            "attack_bonus": 1,
            "damage": [{"formula": "1d4", "types": ["piercing"]}],
            "crit_mult": 1,
        }
    ]
    with pytest.raises(MonsterLoadError):
        load_monster(_write(tmp_path, payload))


def test_rejects_zero_hp(tmp_path: Path) -> None:
    payload = _valid_payload()
    payload["hp_max"] = 0
    with pytest.raises(MonsterLoadError):
        load_monster(_write(tmp_path, payload))


def test_rejects_unknown_key(tmp_path: Path) -> None:
    payload = _valid_payload()
    payload["bogus_field"] = 1
    with pytest.raises(MonsterLoadError):
        load_monster(_write(tmp_path, payload))


def test_rejects_bad_formula(tmp_path: Path) -> None:
    payload = _valid_payload()
    payload["attacks"] = [
        {
            "name": "Bite",
            "kind": "melee",
            "attack_bonus": 1,
            "damage": [{"formula": "banana", "types": ["piercing"]}],
        }
    ]
    with pytest.raises(MonsterLoadError):
        load_monster(_write(tmp_path, payload))