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

const { scenes } = vi.hoisted(() => ({
  scenes: [
    {
      id: 'scene-1',
      name: 'Camp',
      description: 'A quiet camp.',
      imageSrc: '/camp.png',
      connectedSceneIds: ['scene-2'],
      monsterIds: [],
      npcs: [],
      treasureHints: [],
    },
    {
      id: 'scene-2',
      name: 'Trail',
      description: 'A mountain trail.',
      imageSrc: '/trail.png',
      connectedSceneIds: ['scene-1'],
      monsterIds: [],
      npcs: [],
      treasureHints: [],
    },
  ],
}));

vi.mock('../../data/scenePresets', () => ({
  getScenePresetById: (_worldType: unknown, sceneId: string) =>
    scenes.find(scene => scene.id === sceneId) ?? null,
  getSceneFriendlyNpcs: (scene: { npcs?: unknown[] } | null | undefined) => scene?.npcs ?? [],
  getSceneHostileNpcs: () => [],
  getScenePresetsByWorld: () => scenes,
  getWorldCampScenePreset: () => scenes[0] ?? null,
}));

import {
  buildInitialNpcState,
  MAX_COMPANIONS,
} from '../../data/npcInteractions';
import { getScenePresetsByWorld } from '../../data/scenePresets';
import {
  AnimationState,
  type Character,
  type CompanionState,
  type Encounter,
  type GameState,
  type InventoryItem,
  type StoryOption,
  WorldType,
} from '../../types';
import {
  buildMapTravelResolution,
  resolveNpcInteractionDecision,
} from './storyGenerationState';

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

function createCompanion(npcId: string): CompanionState {
  return {
    npcId,
    characterId: `character-${npcId}`,
    joinedAtAffinity: 10,
    hp: 10,
    maxHp: 10,
    mana: 5,
    maxMana: 5,
    skillCooldowns: {},
  };
}

function createBaseState(): GameState {
  const scenes = getScenePresetsByWorld(WorldType.WUXIA);

  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: createEncounter(),
    npcInteractionActive: false,
    currentScenePreset: scenes[0] ?? 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: 10,
    playerInventory: [createInventoryItem('player-potion', 'Potion')],
    playerEquipment: {
      weapon: null,
      armor: null,
      relic: null,
    },
    npcStates: {
      'npc-trader': {
        ...buildInitialNpcState(createEncounter(), WorldType.WUXIA),
        inventory: [createInventoryItem('npc-herb', 'Herb')],
      },
    },
    quests: [],
    roster: [],
    companions: [],
    currentBattleNpcId: null,
    currentNpcBattleMode: null,
    currentNpcBattleOutcome: null,
    sparReturnEncounter: null,
    sparPlayerHpBefore: null,
    sparPlayerMaxHpBefore: null,
    sparStoryHistoryBefore: null,
  };
}

function createInteractionOption(action: Extract<NonNullable<StoryOption['interaction']>, { kind: 'npc' }>['action']): StoryOption {
  return {
    functionId: `npc_${action}`,
    actionText: action,
    text: action,
    visuals: {
      playerAnimation: AnimationState.IDLE,
      playerMoveMeters: 0,
      playerOffsetY: 0,
      playerFacing: 'right',
      scrollWorld: false,
      monsterChanges: [],
    },
    interaction: {
      kind: 'npc',
      npcId: 'npc-trader',
      action,
    },
  };
}

describe('storyGenerationState', () => {
  it('opens the trade modal with the first npc and player inventory items selected', () => {
    const decision = resolveNpcInteractionDecision(
      createBaseState(),
      createInteractionOption('trade'),
    );

    expect(decision.kind).toBe('trade_modal');
    if (decision.kind !== 'trade_modal') {
      throw new Error('Expected trade modal decision');
    }

    expect(decision.modal.selectedNpcItemId).toBe('npc-herb');
    expect(decision.modal.selectedPlayerItemId).toBe('player-potion');
    expect(decision.modal.selectedQuantity).toBe(1);
  });

  it('skips zero-quantity player items when opening the trade modal', () => {
    const decision = resolveNpcInteractionDecision(
      {
        ...createBaseState(),
        playerInventory: [
          createInventoryItem('empty-slot', 'Empty Slot', { quantity: 0 }),
          createInventoryItem('player-herb', 'Herb'),
        ],
      },
      createInteractionOption('trade'),
    );

    expect(decision.kind).toBe('trade_modal');
    if (decision.kind !== 'trade_modal') {
      throw new Error('Expected trade modal decision');
    }

    expect(decision.modal.selectedPlayerItemId).toBe('player-herb');
  });

  it('forces a recruit replacement modal when the active party is full', () => {
    const state = {
      ...createBaseState(),
      companions: Array.from({ length: MAX_COMPANIONS }, (_, index) => createCompanion(`npc-${index + 1}`)),
    };

    const decision = resolveNpcInteractionDecision(
      state,
      createInteractionOption('recruit'),
    );

    expect(decision.kind).toBe('recruit_modal');
    if (decision.kind !== 'recruit_modal') {
      throw new Error('Expected recruit modal decision');
    }

    expect(decision.modal.selectedReleaseNpcId).toBe('npc-1');
  });

  it('opens the gift modal with the preferred gift candidate selected', () => {
    const state = {
      ...createBaseState(),
      playerInventory: [
        createInventoryItem('empty-slot', 'Empty Slot', { quantity: 0 }),
        createInventoryItem('jade-token', 'Jade Token', {
          rarity: 'rare',
          category: '专属',
          tags: ['merchant'],
        }),
      ],
    };

    const decision = resolveNpcInteractionDecision(
      state,
      createInteractionOption('gift'),
    );

    expect(decision.kind).toBe('gift_modal');
    if (decision.kind !== 'gift_modal') {
      throw new Error('Expected gift modal decision');
    }

    expect(decision.modal.selectedItemId).toBe('jade-token');
  });

  it('does not open the gift modal when there are no gift candidates', () => {
    const state = {
      ...createBaseState(),
      playerInventory: [],
    };

    const decision = resolveNpcInteractionDecision(
      state,
      createInteractionOption('gift'),
    );

    expect(decision.kind).toBe('none');
  });

  it('builds a map travel transition that increments runtime stats and clears battle state', () => {
    const scenes = getScenePresetsByWorld(WorldType.WUXIA);
    const sourceScene = scenes[0];
    const targetScene = scenes[1]!;
    const state = {
      ...createBaseState(),
      currentScenePreset: sourceScene ?? null,
      inBattle: true,
      currentBattleNpcId: 'battle-npc',
      currentNpcBattleMode: 'fight' as const,
      currentNpcBattleOutcome: 'fight_victory' as const,
      sparReturnEncounter: createEncounter(),
    };

    const resolution = buildMapTravelResolution(state, targetScene.id);

    expect(resolution).not.toBeNull();
    if (!resolution) {
      throw new Error('Expected map travel resolution');
    }

    expect(resolution.nextState.currentScenePreset?.id).toBe(targetScene.id);
    expect(resolution.nextState.npcInteractionActive).toBe(false);
    expect(resolution.nextState.inBattle).toBe(false);
    expect(resolution.nextState.currentBattleNpcId).toBeNull();
    expect(resolution.nextState.currentNpcBattleMode).toBeNull();
    expect(resolution.nextState.runtimeStats.scenesTraveled).toBe(1);
  });
});