const STORAGE_KEY = "ants-simulation-config";

const defaults = {
    worldSize: 1024,
    antsStartCount: 4,
    antBudget: 512,
    seedWorld: true,
    simulationStepsPerSecond: 60,
    scentThreshold: 0.01,
    scentFadeOutFactor: 0.001,
    scentBlurRadius: 0.1,
    scentMaxStorage: 1e6,
    scentPerMarker: 200,
    scentMaxPerCell: 10,
    antSpeed: 1,
    antRotationAngle: Math.PI / 30,
    brushRadius: 20,
    brushMaterial: -1,
    cameraZoom: 0,
    gravityDirection: "down" as const,
    viewMode: "side" as "side" | "top",
    // per-channel pheromone params
    repellentFadeOutFactor: 0.0005,
    repellentBlurRadius: 0.05,
    repellentMaxPerCell: 10,
    repellentThreshold: 0.01,
};

type ConfigType = typeof defaults;

function loadSaved(): Partial<ConfigType> {
    try {
        const raw = localStorage.getItem(STORAGE_KEY);
        if (raw) return JSON.parse(raw);
    } catch {
        // corrupted data, ignore
    }
    return {};
}

const saved = loadSaved();
const Config: ConfigType = { ...defaults, ...saved };

export function saveConfig(): void {
    const toSave: Partial<ConfigType> = {};
    for (const key of Object.keys(defaults) as (keyof ConfigType)[]) {
        if (Config[key] !== defaults[key]) {
            // biome-ignore lint/suspicious/noExplicitAny: generic key/value copy
            (toSave as any)[key] = Config[key];
        }
    }
    if (Object.keys(toSave).length > 0) {
        localStorage.setItem(STORAGE_KEY, JSON.stringify(toSave));
    } else {
        localStorage.removeItem(STORAGE_KEY);
    }
}

export function resetConfig(): void {
    Object.assign(Config, defaults);
    localStorage.clear();
}

export { defaults };
export default Config;