import { describe, expect, it } from 'vitest';

import type { Character, Encounter, GameState, InventoryItem } from '../types';
import { AnimationState, WorldType } from '../types';
import {
  buildGiftCandidateSummary,
  buildInitialNpcState,
  buildNpcEncounterStoryMoment,
  buildNpcHelpReward,
  buildNpcTradeTransactionActionText,
  syncNpcTradeInventory,
} from './npcInteractions';

function createCharacter(): Character {
  return {
    id: 'hero',
    name: 'Hero',
    title: 'Wanderer',
    description: 'A reliable test hero.',
    backstory: 'Travels the land.',
    avatar: '/hero.png',
    portrait: '/hero-portrait.png',
    assetFolder: 'hero',
    assetVariant: 'default',
    attributes: {
      strength: 10,
      agility: 9,
      intelligence: 8,
      spirit: 7,
    },
    personality: 'steady',
    skills: [],
    adventureOpenings: {},
  };
}

function createEncounter(): Encounter {
  return {
    id: 'npc-trader',
    kind: 'npc',
    npcName: 'Trader Lin',
    npcDescription: 'A traveling merchant.',
    npcAvatar: 'T',
    context: 'merchant',
  };
}

function createInventoryItem(
  id: string,
  name: string,
  overrides: Partial<InventoryItem> = {},
): InventoryItem {
  return {
    id,
    name,
    description: `${name} description`,
    quantity: 1,
    category: 'misc',
    rarity: 'common',
    tags: [],
    value: 1,
    ...overrides,
  };
}

function createGameState(
  encounter: Encounter,
  overrides: Partial<GameState> = {},
): GameState {
  return {
    worldType: WorldType.WUXIA,
    customWorldProfile: null,
    playerCharacter: createCharacter(),
    runtimeStats: {
      playTimeMs: 0,
      lastPlayTickAt: null,
      hostileNpcsDefeated: 0,
      questsAccepted: 0,
      itemsUsed: 0,
      scenesTraveled: 0,
    },
    currentScene: 'Story',
    storyHistory: [],
    characterChats: {},
    animationState: AnimationState.IDLE,
    currentEncounter: encounter,
    npcInteractionActive: true,
    currentScenePreset: {
      id: 'scene-camp',
      name: 'Camp',
      description: 'A temporary camp.',
      imageSrc: '/camp.png',
      npcs: [],
      treasureHints: [],
    },
    sceneHostileNpcs: [],
    playerX: 0,
    playerOffsetY: 0,
    playerFacing: 'right',
    playerActionMode: 'idle',
    scrollWorld: false,
    inBattle: false,
    playerHp: 80,
    playerMaxHp: 100,
    playerMana: 40,
    playerMaxMana: 60,
    playerSkillCooldowns: {},
    activeBuildBuffs: [],
    activeCombatEffects: [],
    playerCurrency: 0,
    playerInventory: [],
    playerEquipment: {
      weapon: null,
      armor: null,
      relic: null,
    },
    npcStates: {},
    quests: [],
    roster: [],
    companions: [],
    currentBattleNpcId: null,
    currentNpcBattleMode: null,
    currentNpcBattleOutcome: null,
    sparReturnEncounter: null,
    sparPlayerHpBefore: null,
    sparPlayerMaxHpBefore: null,
    sparStoryHistoryBefore: null,
    ...overrides,
  };
}

describe('npcInteractions', () => {
  it('builds a readable fallback summary for empty gift candidates', () => {
    expect(buildGiftCandidateSummary([])).toBe('暂无合适礼物');
  });

  it('includes gift candidate context in the npc gift option detail text', () => {
    const encounter = createEncounter();
    const story = buildNpcEncounterStoryMoment({
      encounter,
      npcState: buildInitialNpcState(encounter, WorldType.WUXIA),
      playerCharacter: createCharacter(),
      playerInventory: [
        createInventoryItem('jade-token', 'Jade Token', {
          rarity: 'rare',
          category: '专属',
          tags: ['merchant'],
        }),
        createInventoryItem('tea-brick', 'Tea Brick'),
      ],
      activeQuests: [],
      scene: {
        id: 'scene-1',
        name: 'Camp',
        npcs: [],
        treasureHints: [],
      },
      worldType: WorldType.WUXIA,
      partySize: 0,
    });

    const giftOption = story.options.find((option) => option.functionId === 'npc_gift');
    expect(giftOption).toBeTruthy();
    expect(giftOption?.detailText).toContain('Jade Token');
    expect(giftOption?.detailText).toContain('Tea Brick');
  });

  it('omits the npc gift option when the player has no gift candidates', () => {
    const encounter = createEncounter();
    const story = buildNpcEncounterStoryMoment({
      encounter,
      npcState: buildInitialNpcState(encounter, WorldType.WUXIA),
      playerCharacter: createCharacter(),
      playerInventory: [],
      activeQuests: [],
      scene: {
        id: 'scene-1',
        name: 'Camp',
        npcs: [],
        treasureHints: [],
      },
      worldType: WorldType.WUXIA,
      partySize: 0,
    });

    expect(story.options.some((option) => option.functionId === 'npc_gift')).toBe(false);
  });

  it('uses ai-first copy for quest offers instead of prebuilding a fallback quest preview', () => {
    const encounter = createEncounter();
    const story = buildNpcEncounterStoryMoment({
      encounter,
      npcState: buildInitialNpcState(encounter, WorldType.WUXIA),
      playerCharacter: createCharacter(),
      playerInventory: [],
      activeQuests: [],
      scene: {
        id: 'scene-ruins',
        name: '遗迹外缘',
        npcs: [],
        treasureHints: ['半截封泥'],
      },
      worldType: WorldType.WUXIA,
      partySize: 0,
    });

    const questOption = story.options.find((option) => option.functionId === 'npc_quest_accept');
    expect(questOption).toBeTruthy();
    expect(questOption?.detailText).toContain('AI 剧情引擎');
    expect(questOption?.detailText).not.toContain('完成后可获得');
  });

  it('builds hostile npc encounters as a direct declaration dialogue with only escape and fight', () => {
    const encounter = createEncounter();
    const hostileState = {
      ...buildInitialNpcState(encounter, WorldType.WUXIA),
      affinity: -12,
    };
    const story = buildNpcEncounterStoryMoment({
      encounter,
      npcState: hostileState,
      playerCharacter: createCharacter(),
      playerInventory: [],
      activeQuests: [],
      scene: {
        id: 'scene-pass',
        name: '断桥口',
        npcs: [],
        treasureHints: [],
      },
      worldType: WorldType.WUXIA,
      partySize: 0,
    });

    expect(story.displayMode).toBe('dialogue');
    expect(story.dialogue).toEqual([
      expect.objectContaining({
        speaker: 'npc',
        speakerName: 'Trader Lin',
      }),
    ]);
    expect(story.options.map((option) => option.functionId)).toEqual([
      'battle_escape_breakout',
      'npc_fight',
    ]);
    expect(story.options.map((option) => option.actionText)).toEqual([
      '逃跑',
      '与他对战',
    ]);
  });

  it('builds concrete trade action text for story continuation', () => {
    const encounter = createEncounter();

    expect(
      buildNpcTradeTransactionActionText({
        encounter,
        mode: 'buy',
        item: createInventoryItem('jade-token', 'Jade Token'),
        quantity: 2,
      }),
    ).toBe('从Trader Lin手里买下Jade Token x2');

    expect(
      buildNpcTradeTransactionActionText({
        encounter,
        mode: 'sell',
        item: createInventoryItem('tea-brick', 'Tea Brick'),
        quantity: 1,
      }),
    ).toBe('把Tea Brick卖给Trader Lin');
  });

  it('syncs generic trade stock to the current build while preserving sold-in items', () => {
    const encounter: Encounter = {
      ...createEncounter(),
      context: '商贩',
    };
    const state = createGameState(encounter);
    const syncedState = syncNpcTradeInventory(state, encounter, {
      ...buildInitialNpcState(encounter, WorldType.WUXIA),
      inventory: [createInventoryItem('sold-tea', 'Tea Brick')],
      tradeStockSignature: 'stale-build',
    });

    expect(syncedState.tradeStockSignature).not.toBe('stale-build');
    expect(syncedState.inventory.some(item => item.id === 'sold-tea')).toBe(true);
    expect(
      syncedState.inventory.some(
        item => item.runtimeMetadata?.generationChannel === 'npc_trade',
      ),
    ).toBe(true);
  });

  it('builds npc help rewards from the runtime director', () => {
    const encounter: Encounter = {
      ...createEncounter(),
      context: '商贩',
    };
    const reward = buildNpcHelpReward(encounter, createGameState(encounter));

    expect(reward.items.length).toBeGreaterThan(0);
    expect(reward.items[0]?.runtimeMetadata?.generationChannel).toBe('npc_reward');
    expect(reward.storyHint).toBeTruthy();
  });
});