import { Character, InventoryItem, TimedBuildBuff } from "../types";

export type InventoryUseEffect = {
  hpRestore: number;
  manaRestore: number;
  cooldownReduction: number;
  buildBuffs: TimedBuildBuff[];
};

function getRarityMultiplier(rarity: InventoryItem["rarity"]) {
  switch (rarity) {
    case "legendary":
      return 2.4;
    case "epic":
      return 1.9;
    case "rare":
      return 1.55;
    case "uncommon":
      return 1.2;
    default:
      return 1;
  }
}

export function isInventoryItemUsable(item: InventoryItem) {
  return (
    Boolean(item.useProfile) ||
    item.tags.includes("healing") ||
    item.tags.includes("mana")
  );
}

export function resolveInventoryItemUseEffect(
  item: InventoryItem,
  character: Character,
): InventoryUseEffect | null {
  if (!isInventoryItemUsable(item)) return null;

  if (item.useProfile) {
    return {
      hpRestore: item.useProfile.hpRestore ?? 0,
      manaRestore: item.useProfile.manaRestore ?? 0,
      cooldownReduction: item.useProfile.cooldownReduction ?? 0,
      buildBuffs: item.useProfile.buildBuffs ?? [],
    };
  }

  const rarityMultiplier = getRarityMultiplier(item.rarity);
  const hasHealing =
    item.tags.includes("healing") ||
    /药|包|补给|恢复|疗伤|meat|apple|mushroom|water/i.test(item.name);
  const hasMana =
    item.tags.includes("mana") ||
    /灵液|法力|mana|crystal|essence|spirit/i.test(item.name);

  const hpRestore = hasHealing
    ? Math.max(
        10,
        Math.round((14 + character.attributes.spirit * 1.4) * rarityMultiplier),
      )
    : 0;
  const manaRestore = hasMana
    ? Math.max(
        8,
        Math.round(
          (12 + character.attributes.intelligence * 1.4) * rarityMultiplier,
        ),
      )
    : 0;
  const cooldownReduction = /凝神|回气|醒神|booster|essence/i.test(item.name)
    ? 1
    : 0;

  if (hpRestore <= 0 && manaRestore <= 0 && cooldownReduction <= 0) {
    return null;
  }

  return {
    hpRestore,
    manaRestore,
    cooldownReduction,
    buildBuffs: [],
  };
}

export function buildInventoryUseResultText(
  item: InventoryItem,
  effect: InventoryUseEffect,
) {
  const parts = [
    effect.hpRestore > 0 ? `恢复 ${effect.hpRestore} 点气血` : null,
    effect.manaRestore > 0 ? `恢复 ${effect.manaRestore} 点灵力` : null,
    effect.cooldownReduction > 0
      ? `额外推进 ${effect.cooldownReduction} 回合冷却`
      : null,
    effect.buildBuffs.length > 0
      ? `获得 ${effect.buildBuffs.map(buff => buff.name).join("、")}`
      : null,
  ].filter(Boolean);

  return `你取出${item.name}立刻使用，${parts.join("，")}。`;
}