/**
 * Configuration & Settings Management
 * Handles default values, slider bounds, custom defaults, and localStorage persistence.
 */

export const FACTORY_DEFAULTS = {
  // Starting entity counts & limits
  initialSheep: 25,
  initialWolves: 3,
  initialPlants: 35,
  maxPlantCap: 90,           // Hard cap to keep CPU lightweight and meadow balanced

  // Sheep behavioral attributes
  sheepHungerDepletionRate: 1.2, // per second (sheep graze frequently)
  sheepGrazingReach: 18,         // radius in pixels to snap up plants
  sheepMatingCooldown: 22,       // seconds between sheep births

  // Wolf behavioral attributes & combat exertion
  wolfLungeCost: 7,              // Health expended per attack bite (fatigue/struggle)
  wolfHungerDepletionRate: 1.3,  // per second
  wolfAttackDamage: 38,          // damage per bite to sheep
  wolfMatingCooldown: 35,        // seconds between wolf litters
  wolfMatingThreshold: 86,       // minimum hunger required to seek mate

  // Plant & flora dynamics
  plantSeedRate: 8,              // % chance for clustered mature plants to disperse seed
  plantDryRate: 2.2,             // moisture loss per second in clear weather
  rainFrequency: 45,             // 0 - 100%
  decaySpeed: 1.0,               // 0.2x to 3.0x multiplier on carcass decomposition

  // Movement speeds (preset balance)
  sheepMaxSpeed: 1.8,
  sheepFleeSpeed: 2.8,
  sheepPerceptionRadius: 160,
  wolfMaxSpeed: 2.2,
  wolfChaseSpeed: 4.1,
  wolfPerceptionRadius: 280,
  wolfAttackCooldown: 0.65,

  // World constraints
  worldWidth: 1280,
  worldHeight: 760,
  boundaryMargin: 40,

  // Continuous Mode (Screen Saver / Endless Ecosystem)
  continuousMode: false,
  continuousSheepInterval: 14,
  continuousWolfInterval: 32,
  continuousMaxGroupSize: 3,
};

const STORAGE_KEY = 'LifeSimulator_Config_v2';
const CUSTOM_DEFAULTS_KEY = 'LifeSimulator_Custom_Defaults_v2';

export class ConfigManager {
  constructor() {
    this.current = this.load();
  }

  load() {
    try {
      const saved = localStorage.getItem(STORAGE_KEY);
      if (saved) {
        const parsed = JSON.parse(saved);
        return { ...FACTORY_DEFAULTS, ...parsed };
      }
    } catch (e) {
      console.warn('Failed to load settings from localStorage:', e);
    }
    return { ...FACTORY_DEFAULTS };
  }

  save(newConfig) {
    this.current = { ...this.current, ...newConfig };
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(this.current));
    } catch (e) {
      console.warn('Failed to save settings to localStorage:', e);
    }
    return this.current;
  }

  saveAsNewDefaults(config) {
    this.current = { ...this.current, ...config };
    try {
      localStorage.setItem(CUSTOM_DEFAULTS_KEY, JSON.stringify(this.current));
      localStorage.setItem(STORAGE_KEY, JSON.stringify(this.current));
    } catch (e) {
      console.warn('Failed to save custom defaults:', e);
    }
    return this.current;
  }

  resetToDefaults() {
    // Check if user set custom defaults, otherwise use factory defaults
    let base = FACTORY_DEFAULTS;
    try {
      const custom = localStorage.getItem(CUSTOM_DEFAULTS_KEY);
      if (custom) {
        base = { ...FACTORY_DEFAULTS, ...JSON.parse(custom) };
      }
    } catch (e) {
      console.warn('Failed to read custom defaults:', e);
    }

    this.current = { ...base };
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(this.current));
    } catch (e) {
      console.warn('Failed to reset settings:', e);
    }
    return this.current;
  }

  resetToFactory() {
    this.current = { ...FACTORY_DEFAULTS };
    try {
      localStorage.removeItem(CUSTOM_DEFAULTS_KEY);
      localStorage.setItem(STORAGE_KEY, JSON.stringify(this.current));
    } catch (e) {
      console.warn('Failed to reset to factory defaults:', e);
    }
    return this.current;
  }
}

export const configManager = new ConfigManager();