import { describe, expect, it } from 'vitest';
import { buildContent } from '../../content/schema';
import { createGameState, enqueueAction, startAction } from '../../engine/game';
import { createSave, serializeSave } from '../../engine/save';
import { createMemoryBackend, loadGame, saveGame } from '../persistence';

const DEFAULT_GROUP = { id: 'test', label: 'Test' };

function testContent() {
  return buildContent({
    resources: [{ id: 'gold', name: 'Gold', startAmount: 0 }],
    actions: [
      {
        id: 'forage',
        name: 'Forage',
        group: DEFAULT_GROUP,
        durationMs: 3000,
        yields: [{ resourceId: 'gold', amount: 1 }],
      },
    ],
  });
}

function queueTestContent() {
  return buildContent({
    resources: [{ id: 'gold', name: 'Gold', startAmount: 0 }],
    actions: [
      {
        id: 'a',
        name: 'A',
        group: DEFAULT_GROUP,
        durationMs: 3000,
        yields: [{ resourceId: 'gold', amount: 1 }],
      },
      {
        id: 'b',
        name: 'B',
        group: DEFAULT_GROUP,
        durationMs: 3000,
        yields: [{ resourceId: 'gold', amount: 1 }],
      },
    ],
  });
}

describe('loadGame()', () => {
  it('returns a fresh game when no save exists', async () => {
    const content = testContent();
    const result = await loadGame(content, createMemoryBackend(), 1000);
    expect(result.state.resources.gold).toBe(0);
    expect(result.offlineMs).toBe(0);
  });

  it('round-trips a saved game and credits offline progress', async () => {
    const content = testContent();
    const state = createGameState(content);
    state.resources.gold = 10;
    startAction(state, content, 'forage');
    const backend = createMemoryBackend();
    await saveGame(state, backend, 1000);

    const result = await loadGame(content, backend, 1000 + 9000); // 9s offline
    expect(result.offlineMs).toBe(9000);
    expect(result.state.resources.gold).toBe(11); // 10 + one completion
    expect(result.state.activeActionId).toBeNull();
  });

  it('falls back to a fresh game on a corrupt save instead of throwing', async () => {
    const content = testContent();
    const result = await loadGame(content, createMemoryBackend('@@@garbage@@@'), 1000);
    expect(result.state.resources.gold).toBe(0);
    expect(result.offlineMs).toBe(0);
  });

  it('restores actionQueue on load', async () => {
    const content = queueTestContent();
    const state = createGameState(content);
    enqueueAction(state, content, 'a');
    enqueueAction(state, content, 'b');
    const backend = createMemoryBackend();
    await saveGame(state, backend, 1000);

    const result = await loadGame(content, backend, 1000);
    expect(result.state.activeActionId).toBe('a');
    expect(result.state.actionQueue).toEqual(['b']);
  });

  it('restores story fields on load', async () => {
    const content = testContent();
    const backend = createMemoryBackend();
    const state = createGameState(content);
    state.storyFlags = { route_b: true };
    state.currentStoryNodeId = 'fork_choice';
    state.seenStoryNodeIds = ['boot_intro'];
    await saveGame(state, backend, 1000);
    const loaded = await loadGame(content, backend, 1000);
    expect(loaded.state.storyFlags.route_b).toBe(true);
    expect(loaded.state.currentStoryNodeId).toBe('fork_choice');
  });

  it('drops an active action that no longer exists in content', async () => {
    const content = testContent();
    const stale = serializeSave(
      createSave(
        {
          resources: { gold: 1 },
          activeActionId: 'ghost-action',
          actionElapsedMs: 0,
          actionQueue: [],
          storyFlags: {},
          currentStoryNodeId: '',
          seenStoryNodeIds: [],
          enabledLoopActionIds: {},
        },
        1000,
      ),
    );
    const result = await loadGame(content, createMemoryBackend(stale), 1000);
    expect(result.state.activeActionId).toBeNull();
  });
});