import { describe, expect, it } from 'vitest';
import { buildPier } from '../src/core/geometry';
import { parseProject, serializeProject, SCHEMA_VERSION, type ProjectFile } from '../src/core/project';
import { loadP1 } from './helpers';

function sampleProject(): ProjectFile {
  const p1 = loadP1();
  // 20 piers: P1 plus 19 variants with different names and coping widths, so the file has a realistic size.
  const piers = Array.from({ length: 20 }, (_, i) => {
    const input = i === 0 ? p1 : { ...p1, name: `P${i + 1}`, copingWidthMm: 3100 + i * 10 };
    return { id: `pier-${i + 1}`, input };
  });
  return {
    schemaVersion: SCHEMA_VERSION,
    project: { name: '운곡교 교각', bridge: '운곡교', client: '', author: '', crs: 'KATEC', memo: '' },
    source: { fileName: '운곡교P1입력.xlsx', sheets: ['교각', 'IP', '받침'] },
    piers,
    history: [{ version: '0.1.00', note: '최초 저장', at: '2026-10-22T00:00:00Z' }],
  };
}

describe('project file round trip (spec §8, plan B3)', () => {
  it('save → open gives the same inputs, without the source workbook', () => {
    const original = sampleProject();
    const text = serializeProject(original);
    const reopened = parseProject(text);
    expect(reopened).toEqual(original);
  });

  it('regenerated models match the originals after reopening (20 piers)', () => {
    const original = sampleProject();
    const reopened = parseProject(serializeProject(original));
    original.piers.forEach((p, i) => {
      expect(buildPier(reopened.piers[i].input)).toEqual(buildPier(p.input));
    });
  });

  it('refuses another schema version instead of loading it', () => {
    const text = serializeProject({ ...sampleProject(), schemaVersion: 99 });
    expect(() => parseProject(text)).toThrow('지원하지 않는 파일 버전');
  });

  it('refuses a damaged file and names the broken pier', () => {
    const project = sampleProject();
    const broken = { ...project, piers: [project.piers[0], { id: 'pier-2', input: null }] };
    expect(() => parseProject(JSON.stringify(broken))).toThrow('교각 2');
    expect(() => parseProject('{ not json')).toThrow('JSON');
  });

  it('keeps defaults and an unregenerated draft through save and open', () => {
    const original = sampleProject();
    const p1 = original.piers[0];
    original.piers[0] = { ...p1, defaults: p1.input, draft: { ...p1.input, copingWidthMm: 3300 } };
    const reopened = parseProject(serializeProject(original));
    expect(reopened.piers[0].draft?.copingWidthMm).toBe(3300);
    expect(reopened.piers[0].input.copingWidthMm).toBe(3100);
  });

  it('a file saved before change tracking (no defaults or draft) still opens', () => {
    const legacy = sampleProject();
    const text = JSON.stringify({ ...legacy, piers: legacy.piers.map((p) => ({ id: p.id, input: p.input })) });
    const reopened = parseProject(text);
    expect(reopened.piers[0].defaults).toBeUndefined();
    expect(reopened.piers[0].draft).toBeUndefined();
  });
});

describe('③ 공통 설정 in the project file', () => {
  it('fck and fy are kept through save and open; older files get the defaults through the app', () => {
    const p = sampleProject();
    const withCommon = { ...p, common: { fck: 35, grade: { D: 300, H: 400, S: 500 } } };
    expect(parseProject(serializeProject(withCommon)).common).toEqual({ fck: 35, grade: { D: 300, H: 400, S: 500 } });
    expect(parseProject(serializeProject(p)).common).toBeUndefined();
  });
});