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

import {getCharacterById} from '../data/characterPresets';
import {AnimationState, type Character, type GameState,WorldType} from '../types';
import {buildCompanionRenderStatesForGameState} from './useNpcInteractionFlow';

vi.mock('../data/characterPresets', () => ({
  getCharacterById: vi.fn(),
}));

function createTestCharacter(id: string, name: string): Character {
  return {
    id,
    name,
    title: '测试同伴',
    description: '用于测试的角色',
    backstory: '测试背景',
    avatar: '/test-avatar.png',
    portrait: '/test-portrait.png',
    assetFolder: 'test-character',
    assetVariant: 'default',
    attributes: {
      strength: 10,
      agility: 10,
      intelligence: 10,
      spirit: 10,
    },
    personality: 'steady',
    skills: [
      {
        id: 'basic-strike',
        name: '试探一击',
        animation: AnimationState.ATTACK,
        damage: 10,
        manaCost: 0,
        cooldownTurns: 0,
        range: 1,
        style: 'steady',
      },
    ],
    adventureOpenings: {},
  };
}

function createBaseState(): GameState {
  return {
    worldType: WorldType.WUXIA,
    customWorldProfile: null,
    playerCharacter: createTestCharacter('player', '主角'),
    runtimeStats: {
      playTimeMs: 0,
      lastPlayTickAt: null,
      hostileNpcsDefeated: 0,
      questsAccepted: 0,
      itemsUsed: 0,
      scenesTraveled: 0,
    },
    currentScene: 'Story',
    storyHistory: [],
    characterChats: {},
    animationState: AnimationState.IDLE,
    currentEncounter: null,
    npcInteractionActive: false,
    currentScenePreset: null,
    sceneHostileNpcs: [],
    playerX: 0,
    playerOffsetY: 0,
    playerFacing: 'right',
    playerActionMode: 'idle',
    scrollWorld: false,
    inBattle: false,
    playerHp: 100,
    playerMaxHp: 100,
    playerMana: 20,
    playerMaxMana: 20,
    playerSkillCooldowns: {},
    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,
  };
}

describe('buildCompanionRenderStatesForGameState', () => {
  beforeEach(() => {
    vi.mocked(getCharacterById).mockReset();
  });

  it('builds render states from the provided transition snapshot', () => {
    const companionCharacter = createTestCharacter('companion-a', '阿青');
    vi.mocked(getCharacterById).mockImplementation((characterId: string) => {
      if (characterId === companionCharacter.id || characterId === 'player') {
        return companionCharacter;
      }
      return null;
    });

    const transitionSnapshot: GameState = {
      ...createBaseState(),
      playerFacing: 'left',
      animationState: AnimationState.ATTACK,
      companions: [
        {
          npcId: 'npc-aqing',
          characterId: companionCharacter.id,
          joinedAtAffinity: 10,
          hp: 36,
          maxHp: 48,
          mana: 12,
          maxMana: 18,
          skillCooldowns: {basicStrike: 1},
          offsetX: 14,
          offsetY: -6,
          transitionMs: 90,
        },
      ],
    };

    const renderStates = buildCompanionRenderStatesForGameState({
      gameState: transitionSnapshot,
      presentationByNpcId: {
        'npc-aqing': {
          animationState: AnimationState.ACQUIRE,
          entryOffsetX: 28,
          entryOffsetY: 12,
          transitionMs: 240,
          recruitToken: 42,
        },
      },
      observeFacingByNpcId: {
        'npc-aqing': 'right',
      },
    });

    expect(renderStates).toHaveLength(1);
    expect(renderStates[0]).toMatchObject({
      npcId: 'npc-aqing',
      character: companionCharacter,
      hp: 36,
      maxHp: 48,
      mana: 12,
      maxMana: 18,
      animationState: AnimationState.ACQUIRE,
      slot: 'upper',
      facing: 'right',
      entryOffsetX: 42,
      entryOffsetY: 6,
      transitionMs: 240,
      recruitToken: 42,
    });
  });

  it('lets callers render a visible snapshot even if the live state already changed', () => {
    const companionCharacter = createTestCharacter('companion-b', '小舟');
    vi.mocked(getCharacterById).mockImplementation((characterId: string) => {
      if (characterId === companionCharacter.id || characterId === 'player') {
        return companionCharacter;
      }
      return null;
    });

    const visibleSnapshot: GameState = {
      ...createBaseState(),
      scrollWorld: true,
      companions: [
        {
          npcId: 'npc-xiaozhou',
          characterId: companionCharacter.id,
          joinedAtAffinity: 18,
          hp: 30,
          maxHp: 30,
          mana: 9,
          maxMana: 12,
          skillCooldowns: {},
        },
      ],
    };
    const liveState: GameState = {
      ...createBaseState(),
      companions: [],
    };

    const visibleRenderStates = buildCompanionRenderStatesForGameState({
      gameState: visibleSnapshot,
    });
    const liveRenderStates = buildCompanionRenderStatesForGameState({
      gameState: liveState,
    });

    expect(visibleRenderStates).toHaveLength(1);
    expect(visibleRenderStates[0]?.animationState).toBe(AnimationState.RUN);
    expect(liveRenderStates).toHaveLength(0);
  });
});