"""Host and Blender stroke configuration must stay in sync."""

from __future__ import annotations

import ast
import json
from pathlib import Path

import pytest
import yaml

from orisys_sensor_design import stroke_pattern
from orisys_sensor_design.manifest import repo_root

SCRIPT = repo_root() / "blender" / "scripts" / "camera_grid_stroke.py"


def _constant(name: str):
    tree = ast.parse(SCRIPT.read_text(encoding="utf-8"))
    for node in tree.body:
        if isinstance(node, ast.Assign) and any(
            isinstance(target, ast.Name) and target.id == name for target in node.targets
        ):
            return ast.literal_eval(node.value)
    raise AssertionError(name)


def test_generator_contract():
    assert _constant("DEFAULT_PARAMS") == stroke_pattern.STROKE_DEFAULTS
    assert _constant("MODE") == stroke_pattern.STROKE_MODE


@pytest.mark.parametrize("sensor", ["finger", "finger-xynova"])
def test_revision_settings(sensor):
    path = repo_root() / "sensors" / sensor / "r01" / "design.yaml"
    block = yaml.safe_load(path.read_text(encoding="utf-8"))["stroke_pattern"]
    assert stroke_pattern.resolve_stroke_settings(block) == stroke_pattern.STROKE_DEFAULTS


@pytest.mark.parametrize("block", [
    {"width_min_mm": 0.2}, {"width_ratio": 0}, {"width_ratio": 0.9},
    {"length_ratio": 1}, {"seed": 1.5}, {"proposals": 0},
    {"orientation_mode": "unknown"},
])
def test_invalid_settings(block):
    assert stroke_pattern.validate_stroke_block(block)
    with pytest.raises(stroke_pattern.StrokePatternConfigError):
        stroke_pattern.resolve_stroke_settings(block)


def test_params_round_trip(tmp_path: Path):
    settings = stroke_pattern.resolve_stroke_settings({"seed": 13})
    path = stroke_pattern.write_stroke_params(settings, tmp_path)
    assert json.loads(path.read_text(encoding="utf-8")) == settings