import type {
  ConsumableItem,
  MeleeWeaponItem,
  RangedWeaponItem,
  ArmourItem,
  AmmoItem,
  FlamethrowerItem
} from "../types";
import { GAME_CONFIG } from "../config/GameConfig";

// =============================================================================
// Per-Type Template Lists (Immutable)
// =============================================================================

export const CONSUMABLES = {
  health_potion: {
    name: "Health Potion",
    textureKey: "items",
    spriteIndex: 57,
    healAmount: 5,
    stackable: true,
  },
  throwing_dagger: {
    name: "Throwing Dagger",
    textureKey: "items",
    spriteIndex: 15,
    attack: 4,
    throwable: true,
    stackable: true,
  },
  upgrade_scroll: {
    name: "Upgrade Scroll",
    textureKey: "items",
    spriteIndex: 79,
    stackable: true,
  },
} as const;

export const RANGED_WEAPONS = {
  pistol: {
    name: "Pistol",
    textureKey: "weapons",
    spriteIndex: 1,
    attack: 10,
    range: 8,
    magazineSize: 6,
    ammoType: "9mm",
    projectileSpeed: 15,
    fireSound: "shoot",
  },
} as const;

export const MELEE_WEAPONS = {
  iron_sword: {
    name: "Iron Sword",
    textureKey: "items",
    spriteIndex: 2,
    attack: 2,
  },
} as const;

export const AMMO = {
  ammo_9mm: {
    name: "9mm Ammo",
    textureKey: "weapons",
    spriteIndex: 23,
    ammoType: "9mm",
    stackable: true,
  },
} as const;

export const ARMOUR = {
  leather_armor: {
    name: "Leather Armor",
    textureKey: "items",
    spriteIndex: 25,
    defense: 2,
  },
} as const;

// Combined lookup for rendering (e.g., projectile sprites)
export const ALL_TEMPLATES = {
  ...CONSUMABLES,
  ...RANGED_WEAPONS,
  ...MELEE_WEAPONS,
  ...AMMO,
  ...ARMOUR,
} as const;

// =============================================================================
// Type-Safe IDs (derived from templates)
// =============================================================================

export type ConsumableId = keyof typeof CONSUMABLES;
export type RangedWeaponId = keyof typeof RANGED_WEAPONS;
export type MeleeWeaponId = keyof typeof MELEE_WEAPONS;
export type AmmoId = keyof typeof AMMO;
export type ArmourId = keyof typeof ARMOUR;
export type ItemTemplateId = keyof typeof ALL_TEMPLATES;

// =============================================================================
// Factory Functions
// =============================================================================

import {
  ALL_VARIANTS,
  type ArmourVariantId,
  type WeaponVariantId,
  type ConsumableVariantId
} from "./ItemVariants";

export function createConsumable(
  id: ConsumableId,
  quantity = 1,
  variant?: ConsumableVariantId
): ConsumableItem {
  const t = CONSUMABLES[id];
  const v = variant ? ALL_VARIANTS[variant] : null;

  // Apply effect multiplier for consumables
  const effectMult = v?.statModifiers.effectMultiplier ?? 1;
  const baseHealAmount = "healAmount" in t ? t.healAmount : undefined;
  const finalHealAmount = baseHealAmount ? Math.floor(baseHealAmount * effectMult) : undefined;

  const name = v ? `${v.prefix} ${t.name}` : t.name;

  return {
    id,
    name,
    type: "Consumable",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    stackable: t.stackable ?? false,
    quantity,
    variant,
    stats: {
      hp: finalHealAmount,
      attack: "attack" in t ? t.attack : undefined,
    },
    throwable: "throwable" in t ? t.throwable : undefined,
  };
}

export function createRangedWeapon(
  id: RangedWeaponId,
  variant?: WeaponVariantId
): RangedWeaponItem {
  const t = RANGED_WEAPONS[id];
  const v = variant ? ALL_VARIANTS[variant] : null;

  const name = v ? `${v.prefix} ${t.name}` : t.name;
  const attackBonus = (v?.statModifiers as { attack?: number })?.attack ?? 0;

  return {
    id,
    name,
    type: "Weapon",
    weaponType: "ranged",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    currentAmmo: t.magazineSize,
    reloadingTurnsLeft: 0,
    variant,
    stats: {
      attack: t.attack + attackBonus,
      range: t.range,
      magazineSize: t.magazineSize,
      ammoType: t.ammoType,
      projectileSpeed: t.projectileSpeed,
      fireSound: t.fireSound,
    },
  };
}

export function createMeleeWeapon(
  id: MeleeWeaponId,
  variant?: WeaponVariantId
): MeleeWeaponItem {
  const t = MELEE_WEAPONS[id];
  const v = variant ? ALL_VARIANTS[variant] : null;

  const name = v ? `${v.prefix} ${t.name}` : t.name;
  const attackBonus = (v?.statModifiers as { attack?: number })?.attack ?? 0;

  return {
    id,
    name,
    type: "Weapon",
    weaponType: "melee",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    variant,
    stats: {
      attack: t.attack + attackBonus,
    },
  };
}

export function createAmmo(id: AmmoId, quantity = 10): AmmoItem {
  const t = AMMO[id];
  return {
    id,
    name: t.name,
    type: "Ammo",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    ammoType: t.ammoType,
    stackable: true,
    quantity,
  };
}

export function createArmour(
  id: ArmourId,
  variant?: ArmourVariantId
): ArmourItem {
  const t = ARMOUR[id];
  const v = variant ? ALL_VARIANTS[variant] : null;

  const name = v ? `${v.prefix} ${t.name}` : t.name;
  const defenseBonus = v?.statModifiers.defense ?? 0;

  return {
    id,
    name,
    type: "BodyArmour",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    variant,
    stats: {
      defense: t.defense + defenseBonus,
    },
  };
}

export function createUpgradeScroll(quantity = 1): ConsumableItem {
  const t = CONSUMABLES["upgrade_scroll"];
  return {
    id: "upgrade_scroll",
    name: t.name,
    type: "Consumable",
    textureKey: t.textureKey,
    spriteIndex: t.spriteIndex,
    stackable: true,
    quantity,
  };
}

export function createFlamethrower(): FlamethrowerItem {
  const config = GAME_CONFIG.gameplay.flamethrower;
  return {
    id: "flamethrower",
    name: "Flamethrower",
    type: "Weapon",
    weaponType: "flamethrower",
    textureKey: "weapons",
    spriteIndex: 5,
    charges: config.maxCharges,
    maxCharges: config.maxCharges,
    lastRechargeTurn: 0,
    stats: {
      attack: config.initialDamage,
      range: config.range,
    },
  };
}

// Legacy export for backward compatibility during migration
export const ITEMS = ALL_TEMPLATES;