/**
 * PvZ Dynamic Game Configuration & Balance System (PvZConfig)
 * Fetches active balance multipliers from /api/config with fallback defaults and offline localStorage cache.
 */

window.PvZConfig = (function () {
  const DEFAULT_CONFIG = {
    preset: 'Classic 2009',
    economy: {
      sunMultiplier: 1.0,
      startingSun: 50,
      coinDropRate: 1.0,
      sunDropRate: 1.0,
      plantCostMultiplier: 1.0,
      upgradeCostMultiplier: 1.0,
      plantPrices: {
        sunflower: 0,
        peashooter: 0,
        wallnut: 0,
        potatomine: 150,
        snowpea: 350,
        repeater: 500,
        chomper: 450,
        cherrybomb: 400,
        jalapeno: 450,
        sunshroom: 250,
        fumeshroom: 300,
        lilypad: 200,
        gravebuster: 250,
        flowerpot: 200,
        cabbagepult: 400,
        melonpult: 750
      },
      plantSunCosts: {
        sunflower: 50,
        peashooter: 100,
        wallnut: 50,
        potatomine: 25,
        snowpea: 175,
        repeater: 200,
        chomper: 150,
        cherrybomb: 150,
        jalapeno: 125,
        sunshroom: 25,
        fumeshroom: 75,
        lilypad: 25,
        gravebuster: 75,
        flowerpot: 25,
        cabbagepult: 100,
        melonpult: 300
      }
    },
    zombies: {
      hpMultiplier: 1.0,
      speedMultiplier: 1.0,
      damageMultiplier: 1.0,
      waveDensityMultiplier: 1.0,
      types: {
        normal: { hp: 200, speed: 22, damage: 30 },
        conehead: { hp: 300, speed: 22, damage: 30 },
        buckethead: { hp: 600, speed: 22, damage: 30 },
        newspaper: { hp: 300, speed: 18, damage: 30 },
        screendoor: { hp: 650, speed: 20, damage: 30 },
        football: { hp: 600, speed: 42, damage: 35 },
        dancing: { hp: 350, speed: 25, damage: 30 },
        gargantuar: { hp: 3000, speed: 14, damage: 300 },
        zomboss: { hp: 10000, speed: 0, damage: 500 },
        polevaulter: { hp: 180, speed: 44, damage: 30 },
        duckytube: { hp: 120, speed: 24, damage: 30 },
        flag: { hp: 200, speed: 28, damage: 30 }
      }
    },
    plants: {
      damageMultiplier: 1.0,
      hpMultiplier: 1.0,
      cooldownMultiplier: 1.0,
      sunProduceIntervalMultiplier: 1.0
    },
    zenGarden: {
      dropRateMultiplier: 1.0,
      growthRateMultiplier: 1.0,
      fertilizerMultiplier: 1.0,
      waterIntervalMinutes: 30
    },
    events: {
      doubleGold: false,
      fastCooldowns: false,
      infiniteSun: false,
      turboZombies: false,
      activeEventName: 'none'
    }
  };

  let activeConfig = JSON.parse(JSON.stringify(DEFAULT_CONFIG));

  // Try loading cached config from localStorage
  try {
    const cached = localStorage.getItem('pvz_game_config');
    if (cached) {
      const parsed = JSON.parse(cached);
      if (parsed && typeof parsed === 'object') {
        activeConfig = Object.assign({}, DEFAULT_CONFIG, parsed);
      }
    }
  } catch (e) {
    // ignore
  }

  async function fetchConfig() {
    try {
      const controller = new AbortController();
      const timeoutId = setTimeout(() => controller.abort(), 2500);
      const res = await fetch('/api/config', { signal: controller.signal });
      clearTimeout(timeoutId);

      if (res.ok) {
        const data = await res.json();
        if (data && typeof data === 'object') {
          activeConfig = Object.assign({}, DEFAULT_CONFIG, data);
          try {
            localStorage.setItem('pvz_game_config', JSON.stringify(activeConfig));
          } catch (e) {}
        }
      }
    } catch (err) {
      console.warn('[PvZConfig] Using cached/default balance config:', err.message);
    }
    return activeConfig;
  }

  // Auto-fetch on script load
  if (typeof window !== 'undefined') {
    fetchConfig();
  }

  return {
    fetchConfig,
    getConfig: () => activeConfig,
    getPreset: () => activeConfig.preset || 'Classic 2009',

    // Economy
    getEconomy: () => activeConfig.economy || DEFAULT_CONFIG.economy,
    getStartingSun: () => {
      const eco = activeConfig.economy || {};
      const base = typeof eco.startingSun === 'number' ? eco.startingSun : 50;
      return activeConfig.events?.infiniteSun ? Math.max(base, 250) : base;
    },
    getSunMultiplier: () => {
      const eco = activeConfig.economy || {};
      const mult = typeof eco.sunMultiplier === 'number' ? eco.sunMultiplier : 1.0;
      return activeConfig.events?.infiniteSun ? mult * 1.5 : mult;
    },
    getCoinDropRate: () => {
      const eco = activeConfig.economy || {};
      const mult = typeof eco.coinDropRate === 'number' ? eco.coinDropRate : 1.0;
      return activeConfig.events?.doubleGold ? mult * 2.0 : mult;
    },
    getSunDropRate: () => activeConfig.economy?.sunDropRate ?? 1.0,
    getPlantShopPrice: (plantId) => {
      const eco = activeConfig.economy || {};
      const prices = eco.plantPrices || {};
      const base = prices[plantId] ?? (plantId === 'sunflower' || plantId === 'peashooter' || plantId === 'wallnut' ? 0 : 250);
      const mult = eco.plantCostMultiplier ?? 1.0;
      return Math.round(base * mult);
    },
    getPlantSunCost: (plantId, defaultCost = 50) => {
      const eco = activeConfig.economy || {};
      const sunCosts = eco.plantSunCosts || {};
      return sunCosts[plantId] !== undefined ? sunCosts[plantId] : defaultCost;
    },

    // Zombies & Combat
    getZombieGlobal: () => activeConfig.zombies || DEFAULT_CONFIG.zombies,
    getZombieHpMult: () => activeConfig.zombies?.hpMultiplier ?? 1.0,
    getZombieSpeedMult: () => {
      const mult = activeConfig.zombies?.speedMultiplier ?? 1.0;
      return activeConfig.events?.turboZombies ? mult * 1.3 : mult;
    },
    getZombieDamageMult: () => activeConfig.zombies?.damageMultiplier ?? 1.0,
    getWaveDensityMult: () => activeConfig.zombies?.waveDensityMultiplier ?? 1.0,
    getZombieTypeConfig: (type) => {
      const types = activeConfig.zombies?.types || {};
      return types[type] || DEFAULT_CONFIG.zombies.types[type] || { hp: 200, speed: 22, damage: 30 };
    },

    // Plants
    getPlantGlobal: () => activeConfig.plants || DEFAULT_CONFIG.plants,
    getPlantDamageMult: () => activeConfig.plants?.damageMultiplier ?? 1.0,
    getPlantHpMult: () => activeConfig.plants?.hpMultiplier ?? 1.0,
    getPlantCooldownMult: () => {
      const mult = activeConfig.plants?.cooldownMultiplier ?? 1.0;
      return activeConfig.events?.fastCooldowns ? mult * 0.4 : mult;
    },
    getSunIntervalMult: () => activeConfig.plants?.sunProduceIntervalMultiplier ?? 1.0,

    // Zen Garden
    getZenGarden: () => activeConfig.zenGarden || DEFAULT_CONFIG.zenGarden,
    getZenDropRateMult: () => {
      const mult = activeConfig.zenGarden?.dropRateMultiplier ?? 1.0;
      return activeConfig.events?.doubleGold ? mult * 2.0 : mult;
    },
    getZenGrowthRateMult: () => activeConfig.zenGarden?.growthRateMultiplier ?? 1.0,
    getZenFertilizerMult: () => activeConfig.zenGarden?.fertilizerMultiplier ?? 1.0,
    getZenWaterIntervalMinutes: () => activeConfig.zenGarden?.waterIntervalMinutes ?? 30,

    // Events
    getEvents: () => activeConfig.events || DEFAULT_CONFIG.events
  };
})();