import { existsSync } from 'node:fs';

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

import { SERVER_RUNTIME_FUNCTION_IDS } from '../../../packages/shared/src/contracts/rpgRuntimeStoryAction';
import type { Encounter, GameState, InventoryItem } from '../../types';
import {
  ALL_FUNCTION_DOCUMENTATION,
  buildCampTravelHomeOption,
  buildContinueAdventureOption,
  buildNpcGiftModalState,
  buildNpcPreviewTalkOption,
  buildNpcRecruitModalState,
  buildNpcTradeModalState,
  CAMP_TRAVEL_HOME_FUNCTION,
  CONTINUE_ADVENTURE_FUNCTION,
  getFunctionDocumentationById,
  isNpcPreviewTalkOption,
  NPC_PREVIEW_TALK_FUNCTION,
  shouldNpcRecruitOpenModal,
} from './index';
import { RPG_FUNCTION_RUNTIME_OVERVIEW } from './runtimeIndex';

function createEncounter(overrides: Partial<Encounter> = {}): Encounter {
  return {
    id: 'npc-trader',
    kind: 'npc',
    npcName: '梁伯',
    npcDescription: '沿路摆摊的商人。',
    npcAvatar: '梁',
    context: '商贩',
    ...overrides,
  };
}

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

function createModalState(overrides: Partial<GameState> = {}): GameState {
  return {
    playerInventory: [
      createInventoryItem('player-potion', '疗伤药'),
      createInventoryItem('player-charm', '护符'),
    ],
    companions: [
      {
        npcId: 'npc-ally-1',
        characterId: 'ally-1',
        name: '阿青',
        role: '同伴',
        joinedAtAffinity: 12,
      },
    ],
    ...overrides,
  } as GameState;
}

describe('functionCatalog', () => {
  it('keeps function documentation ids unique and source files resolvable', () => {
    const documentationIds = ALL_FUNCTION_DOCUMENTATION.map((entry) => entry.id);

    expect(new Set(documentationIds).size).toBe(documentationIds.length);
    ALL_FUNCTION_DOCUMENTATION.forEach((entry) => {
      expect(existsSync(entry.source), `${entry.id} -> ${entry.source}`).toBe(
        true,
      );
      expect(getFunctionDocumentationById(entry.id)).toEqual(entry);
    });
  });

  it('covers every server runtime function id with documentation metadata', () => {
    SERVER_RUNTIME_FUNCTION_IDS.forEach((functionId) => {
      expect(getFunctionDocumentationById(functionId)).not.toBeNull();
    });
  });

  it('keeps runtime overview aligned with the main function documentation list', () => {
    expect(RPG_FUNCTION_RUNTIME_OVERVIEW.allDocumentation).toEqual(
      ALL_FUNCTION_DOCUMENTATION,
    );
  });

  it('builds flow helper options with the expected function ids', () => {
    const continueOption = buildContinueAdventureOption();
    const campTravelOption = buildCampTravelHomeOption('竹林古道');

    expect(continueOption.functionId).toBe(CONTINUE_ADVENTURE_FUNCTION.id);
    expect(continueOption.priority).toBe(99);
    expect(campTravelOption.functionId).toBe('camp_travel_home_scene');
    expect(campTravelOption.actionText).toBe('前往 竹林古道');
    expect(campTravelOption.detailText).toBe('离开营地，前往 竹林古道。');
    expect(CAMP_TRAVEL_HOME_FUNCTION.runtime?.executor).toContain(
      'server-rs/crates/module-runtime-story/src/session_action.rs',
    );
    expect(CAMP_TRAVEL_HOME_FUNCTION.detailedDescription).toContain(
      '后端 resolver',
    );
  });

  it('builds npc preview talk options from the current encounter', () => {
    const option = buildNpcPreviewTalkOption(createEncounter());

    expect(option.functionId).toBe(NPC_PREVIEW_TALK_FUNCTION.id);
    expect(option.actionText).toBe('与 梁伯 交谈');
    expect(isNpcPreviewTalkOption(option)).toBe(true);
  });

  it('builds modal helper state for trade, gift and recruit flows', () => {
    const state = createModalState();
    const encounter = createEncounter();
    const tradeModal = buildNpcTradeModalState(
      encounter,
      '先看看货',
      'npc-herb',
      'player-potion',
    );
    const giftModal = buildNpcGiftModalState(
      encounter,
      '送你一样东西',
      'player-charm',
    );
    const recruitModal = buildNpcRecruitModalState(
      state,
      encounter,
      '谈谈同行的事',
    );

    expect(tradeModal.selectedNpcItemId).toBe('npc-herb');
    expect(tradeModal.selectedPlayerItemId).toBe('player-potion');
    expect(giftModal.selectedItemId).toBe('player-charm');
    expect(recruitModal.selectedReleaseNpcId).toBe('npc-ally-1');
    expect(shouldNpcRecruitOpenModal(2, 2)).toBe(true);
    expect(shouldNpcRecruitOpenModal(1, 2)).toBe(false);
  });

  it('keeps server-selected trade item ids when opening the trade modal', () => {
    const encounter = createEncounter();
    const tradeModal = buildNpcTradeModalState(
      encounter,
      '交易',
      'npc-herb',
      'usable-item',
    );

    expect(tradeModal.selectedPlayerItemId).toBe('usable-item');
  });
});