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

import { buildChapterQuestForScene } from '../../data/questFlow';
import { AnimationState, type GameState, WorldType } from '../../types';
import { advanceChapterState, resolveCurrentChapterState } from './chapterDirector';

function createState(signalCount: number): GameState {
  return {
    worldType: null,
    customWorldProfile: null,
    playerCharacter: null,
    runtimeStats: {
      playTimeMs: 0,
      lastPlayTickAt: null,
      hostileNpcsDefeated: 0,
      questsAccepted: 0,
      itemsUsed: 0,
      scenesTraveled: 0,
    },
    currentScene: 'Story',
    storyHistory: [],
    storyEngineMemory: {
      discoveredFactIds: [],
      inferredFactIds: [],
      activeThreadIds: ['thread-1'],
      resolvedScarIds: [],
      recentCarrierIds: [],
      recentSignalIds: Array.from({ length: signalCount }, (_, index) => `signal-${index + 1}`),
      recentCompanionReactions: [],
      currentChapter: null,
      currentJourneyBeatId: null,
      companionArcStates: [],
      worldMutations: [],
      chronicle: [],
      factionTensionStates: [],
      currentCampEvent: null,
      currentSetpieceDirective: null,
      continueGameDigest: null,
    },
    chapterState: null,
    characterChats: {},
    animationState: AnimationState.IDLE,
    currentEncounter: null,
    npcInteractionActive: false,
    currentScenePreset: null,
    sceneHostileNpcs: [],
    playerX: 0,
    playerOffsetY: 0,
    playerFacing: 'right',
    playerActionMode: 'idle',
    scrollWorld: false,
    inBattle: false,
    playerHp: 0,
    playerMaxHp: 0,
    playerMana: 0,
    playerMaxMana: 0,
    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,
  };
}

function createSceneChapterState() {
  const quest = buildChapterQuestForScene({
    scene: {
      id: 'scene-court',
      name: '宫苑内庭',
      description: '回廊深处静得过分。',
      npcs: [
        {
          id: 'npc-maid',
          name: '旧宫侍女',
          description: '她总知道哪条回廊最近不该过去。',
          avatar: '侍',
          role: '宫人',
          hostile: false,
        },
        {
          id: 'hostile-shadow',
          name: '旧宫戍影',
          description: '巡行在回廊里的敌影。',
          avatar: '戍',
          role: '敌对角色',
          monsterPresetId: 'monster-11',
          hostile: true,
        },
      ],
      treasureHints: ['回廊暗格里的香囊'],
    },
    worldType: WorldType.WUXIA,
  });

  if (!quest) {
    throw new Error('Expected chapter quest');
  }

  return {
    ...createState(0),
    currentScenePreset: {
      id: 'scene-court',
      name: '宫苑内庭',
      description: '回廊深处静得过分。',
      imageSrc: '/scene.png',
      treasureHints: ['回廊暗格里的香囊'],
      npcs: [],
    },
    quests: [quest],
  } satisfies GameState;
}

describe('chapterDirector', () => {
  it('resolves chapter stages from signal intensity', () => {
    expect(resolveCurrentChapterState({ state: createState(1) }).stage).toBe('opening');
    expect(resolveCurrentChapterState({ state: createState(4) }).stage).toBe('expansion');
    expect(resolveCurrentChapterState({ state: createState(10) }).stage).toBe('climax');
  });

  it('keeps chapter id stable when stage and theme do not change', () => {
    const previous = resolveCurrentChapterState({ state: createState(4) });
    const next = advanceChapterState({
      previousChapter: previous,
      nextChapter: resolveCurrentChapterState({ state: createState(4) }),
    });

    expect(next.id).toBe(previous.id);
  });

  it('binds the current chapter to the current scene chapter quest', () => {
    const openingState = createSceneChapterState();
    const openingChapter = resolveCurrentChapterState({ state: openingState });
    expect(openingChapter.id).toBe('chapter:scene:scene-court');
    expect(openingChapter.sceneId).toBe('scene-court');
    expect(openingChapter.chapterQuestId).toBe('quest:chapter:scene-court');
    expect(openingChapter.stage).toBe('opening');

    const turningState: GameState = {
      ...openingState,
      quests: [
        {
          ...openingState.quests[0]!,
          steps: openingState.quests[0]!.steps?.map((step) =>
            step.id === 'step_scene_opening'
              ? { ...step, progress: step.requiredCount }
              : step.id === 'step_scene_pressure'
                ? { ...step, progress: step.requiredCount }
                : step,
          ),
          activeStepId: 'step_scene_turning',
        },
      ],
    };
    expect(resolveCurrentChapterState({ state: turningState }).stage).toBe('turning_point');

    const climaxState: GameState = {
      ...turningState,
      quests: [
        {
          ...turningState.quests[0]!,
          steps: turningState.quests[0]!.steps?.map((step) => ({
            ...step,
            progress: step.requiredCount,
          })),
          activeStepId: null,
          status: 'ready_to_turn_in',
        },
      ],
    };
    expect(resolveCurrentChapterState({ state: climaxState }).stage).toBe('climax');

    const aftermathState: GameState = {
      ...climaxState,
      quests: [
        {
          ...climaxState.quests[0]!,
          status: 'turned_in',
        },
      ],
    };
    expect(resolveCurrentChapterState({ state: aftermathState }).stage).toBe('aftermath');
  });
});