import {
  AnimationState,
  type Encounter,
  type GameState,
  type StoryMoment,
  type StoryOption,
  type TreasureInteractionAction,
} from '../types';
import { formatCurrency } from './economy';
import {
  TREASURE_INSPECT_FUNCTION,
  TREASURE_LEAVE_FUNCTION,
  TREASURE_SECURE_FUNCTION,
} from './functionCatalog';
import { buildRuntimeItemGenerationContext } from './runtimeItemContext';
import { buildDirectedRuntimeReward } from './runtimeItemDirector';
import { flattenDirectedRuntimeRewardItems } from './runtimeItemNarrative';

export type TreasureReward = {
  items: ReturnType<typeof flattenDirectedRuntimeRewardItems>;
  hp: number;
  mana: number;
  currency: number;
  storyHint?: string;
};

function buildTreasureOption(
  functionId: string,
  actionText: string,
  detailText: string,
  action: TreasureInteractionAction,
): StoryOption {
  return {
    functionId,
    actionText,
    detailText,
    visuals: {
      playerAnimation: AnimationState.IDLE,
      playerMoveMeters: 0,
      playerOffsetY: 0,
      playerFacing: 'right',
      scrollWorld: false,
      monsterChanges: [],
    },
    interaction: {
      kind: 'treasure',
      action,
    },
  } as StoryOption;
}

function buildTreasureReward(
  state: GameState,
  encounter: Encounter,
  action: TreasureInteractionAction,
): TreasureReward {
  const context = buildRuntimeItemGenerationContext({
    state,
    generationChannel: 'treasure',
    encounter,
  });
  const directed = buildDirectedRuntimeReward(context, {
    seedKey: `treasure:${encounter.id ?? encounter.npcName}:${action}`,
    variant: action,
    itemCount: action === 'inspect' ? 2 : 2,
    fixedKinds:
      action === 'inspect' ? ['relic', 'consumable'] : ['relic', 'material'],
    fixedPermanence:
      action === 'inspect' ? ['permanent', 'timed'] : ['permanent', 'resource'],
    baseHp: action === 'inspect' ? 10 : 0,
    baseMana: action === 'inspect' ? 12 : 0,
    baseCurrency:
      action === 'inspect'
        ? state.worldType === 'XIANXIA'
          ? 34
          : 48
        : state.worldType === 'XIANXIA'
          ? 22
          : 30,
    storyHint: `${encounter.npcName}里藏着与你当前构筑和现场线索贴合的战利品。`,
  });

  return {
    items: flattenDirectedRuntimeRewardItems(directed),
    hp: directed.hp ?? 0,
    mana: directed.mana ?? 0,
    currency: directed.currency ?? 0,
    storyHint: directed.storyHint,
  };
}

export function buildTreasureEncounterStoryMoment({
  state,
  encounter,
  overrideText,
}: {
  state: GameState;
  encounter: Encounter;
  overrideText?: string;
}): StoryMoment {
  const secureReward = buildTreasureReward(state, encounter, 'secure');
  const inspectReward = buildTreasureReward(state, encounter, 'inspect');

  return {
    text:
      overrideText ??
      `你在 ${encounter.npcName} 前停下脚步。${encounter.npcDescription} 它看起来并非随意遗落，而像是被刻意留在这里。`,
    options: [
      buildTreasureOption(
        TREASURE_SECURE_FUNCTION.id,
        TREASURE_SECURE_FUNCTION.title,
        `直接带走 ${secureReward.items.map((item) => item.name).join('、')}，并获得 ${formatCurrency(secureReward.currency, state.worldType)}。`,
        'secure',
      ),
      buildTreasureOption(
        TREASURE_INSPECT_FUNCTION.id,
        TREASURE_INSPECT_FUNCTION.title,
        `多花些时间搜查，可额外拿到 ${inspectReward.items.map((item) => item.name).join('、')}、${formatCurrency(inspectReward.currency, state.worldType)} 与恢复收益。`,
        'inspect',
      ),
      buildTreasureOption(
        TREASURE_LEAVE_FUNCTION.id,
        TREASURE_LEAVE_FUNCTION.title,
        `先把 ${encounter.npcName} 的位置和迹象记住，暂时不动它。`,
        'leave',
      ),
    ],
  };
}

export function resolveTreasureReward(
  state: GameState,
  encounter: Encounter,
  action: TreasureInteractionAction,
) {
  return buildTreasureReward(state, encounter, action);
}

export function buildTreasureResultText(
  encounter: Encounter,
  action: TreasureInteractionAction,
  reward?: TreasureReward,
) {
  if (action === 'leave') {
    return `你暂时没有触碰 ${encounter.npcName}，只是把它的异常位置和痕迹牢牢记下。`;
  }

  const itemText = reward?.items.length
    ? reward.items.map((item) => item.name).join('、')
    : '零散战利品';
  const restoreParts = [
    (reward?.hp ?? 0) > 0 ? `气血 +${reward?.hp ?? 0}` : null,
    (reward?.mana ?? 0) > 0 ? `灵力 +${reward?.mana ?? 0}` : null,
  ].filter(Boolean);
  const restoreText =
    restoreParts.length > 0 ? `，并恢复 ${restoreParts.join('、')}` : '';
  const currencyText = reward ? `，另得 ${reward.currency} 钱币` : '';
  const storyHint = reward?.storyHint ? ` ${reward.storyHint}` : '';

  if (action === 'inspect') {
    return `你仔细检查了 ${encounter.npcName}，顺着现场痕迹拆开机关与伪装，最终收回 ${itemText}${currencyText}${restoreText}。${storyHint}`;
  }

  return `你迅速收下了 ${encounter.npcName} 中最关键的收获：${itemText}${currencyText}。${storyHint}`;
}