import { describe, it, expect, beforeEach, afterAll } from 'vitest';
import fs from 'fs';
import path from 'path';
import { Score } from '../../shared/types.js';

const DATA_DIR = path.join(process.cwd(), 'server', 'data');
const SESSION_FILE = path.join(DATA_DIR, 'session.json');
const SEED_FILE = path.join(DATA_DIR, 'seed.json');
const BACKUP_FILE = path.join(DATA_DIR, 'session.json.bak');

// Import the store module — initialization runs on import
import * as store from '../store.js';

describe('server/store', () => {
  // Reset session.json from seed before each test for isolation
  beforeEach(() => {
    const seedData = fs.readFileSync(SEED_FILE, 'utf-8');
    fs.writeFileSync(SESSION_FILE, seedData, 'utf-8');
    // Remove backup if it exists
    if (fs.existsSync(BACKUP_FILE)) {
      fs.unlinkSync(BACKUP_FILE);
    }
  });

  // Clean up after all tests
  afterAll(() => {
    // Restore session.json from seed
    const seedData = fs.readFileSync(SEED_FILE, 'utf-8');
    fs.writeFileSync(SESSION_FILE, seedData, 'utf-8');
    if (fs.existsSync(BACKUP_FILE)) {
      fs.unlinkSync(BACKUP_FILE);
    }
  });

  it('getStore() returns valid StoreData', () => {
    const data = store.getStore();
    expect(data).toHaveProperty('session');
    expect(data).toHaveProperty('teams');
    expect(data).toHaveProperty('jurors');
    expect(data).toHaveProperty('scores');
    expect(data.session.id).toBe('unikat-2026');
  });

  it('getStore() returns seed data structure', () => {
    const data = store.getStore();
    expect(data.teams).toHaveLength(11);
    expect(data.jurors).toHaveLength(6);
    expect(data.scores).toEqual([]);
  });

  it('saveStore() creates a .bak backup', () => {
    const data = store.getStore();
    store.saveStore(data);
    expect(fs.existsSync(BACKUP_FILE)).toBe(true);
  });

  it('saveStore() writes data atomically (persists changes)', () => {
    const data = store.getStore();
    data.session.status = 'active';
    store.saveStore(data);

    const reloaded = store.getStore();
    expect(reloaded.session.status).toBe('active');
  });

  it('saveStore() backup contains previous data', () => {
    const originalData = store.getStore();
    const originalStatus = originalData.session.status;

    originalData.session.status = 'active';
    store.saveStore(originalData);

    const backupContent = JSON.parse(fs.readFileSync(BACKUP_FILE, 'utf-8'));
    expect(backupContent.session.status).toBe(originalStatus);
  });

  it('getSession() returns the session', () => {
    const session = store.getSession();
    expect(session.id).toBe('unikat-2026');
    expect(session.status).toBe('setup');
    expect(session.config.criteria).toHaveLength(5);
  });

  it('getTeams() returns all teams', () => {
    const teams = store.getTeams();
    expect(teams).toHaveLength(11);
    expect(teams[0]).toHaveProperty('id');
    expect(teams[0]).toHaveProperty('name');
    expect(teams[0]).toHaveProperty('number');
  });

  it('getJurors() returns all jurors', () => {
    const jurors = store.getJurors();
    expect(jurors).toHaveLength(6);
    expect(jurors[0]).toHaveProperty('id');
    expect(jurors[0]).toHaveProperty('name');
    expect(jurors[0]).toHaveProperty('active');
  });

  it('getScores() returns empty scores array initially', () => {
    const scores = store.getScores();
    expect(Array.isArray(scores)).toBe(true);
    expect(scores).toHaveLength(0);
  });

  it('addScore() adds a new score', () => {
    const score: Score = {
      jurorId: 'finke',
      teamId: 'dual',
      criterionId: 'gesamtidee',
      value: 8,
      updatedAt: new Date().toISOString(),
    };
    store.addScore(score);

    const scores = store.getScores();
    expect(scores).toHaveLength(1);
    expect(scores[0].jurorId).toBe('finke');
    expect(scores[0].teamId).toBe('dual');
    expect(scores[0].criterionId).toBe('gesamtidee');
    expect(scores[0].value).toBe(8);
  });

  it('addScore() updates existing score (match by jurorId+teamId+criterionId)', () => {
    const score1: Score = {
      jurorId: 'finke',
      teamId: 'dual',
      criterionId: 'gesamtidee',
      value: 7,
      updatedAt: '2026-05-19T10:00:00Z',
    };
    store.addScore(score1);

    const score2: Score = {
      jurorId: 'finke',
      teamId: 'dual',
      criterionId: 'gesamtidee',
      value: 9,
      updatedAt: '2026-05-19T10:01:00Z',
    };
    store.addScore(score2);

    const scores = store.getScores();
    const matching = scores.filter(
      (s) =>
        s.jurorId === 'finke' &&
        s.teamId === 'dual' &&
        s.criterionId === 'gesamtidee'
    );
    expect(matching).toHaveLength(1);
    expect(matching[0].value).toBe(9);
    expect(matching[0].updatedAt).toBe('2026-05-19T10:01:00Z');
  });

  it('addScore() does not affect scores for different criteria', () => {
    const score1: Score = {
      jurorId: 'finke',
      teamId: 'dual',
      criterionId: 'gesamtidee',
      value: 7,
      updatedAt: '2026-05-19T10:00:00Z',
    };
    const score2: Score = {
      jurorId: 'finke',
      teamId: 'dual',
      criterionId: 'markt',
      value: 9,
      updatedAt: '2026-05-19T10:01:00Z',
    };
    store.addScore(score1);
    store.addScore(score2);

    const scores = store.getScores();
    expect(scores).toHaveLength(2);
  });

  it('updateSession() merges partial updates', () => {
    const updated = store.updateSession({
      status: 'active',
      startedAt: '2026-05-19T18:00:00Z',
    });
    expect(updated.status).toBe('active');
    expect(updated.startedAt).toBe('2026-05-19T18:00:00Z');
    expect(updated.id).toBe('unikat-2026');
    expect(updated.config.criteria).toHaveLength(5);
  });

  it('updateSession() persists changes', () => {
    store.updateSession({ status: 'active' });
    const session = store.getSession();
    expect(session.status).toBe('active');
  });

  it('updateJuror() updates a juror by ID', () => {
    const updated = store.updateJuror('finke', { active: true });
    expect(updated).not.toBeNull();
    expect(updated!.active).toBe(true);
    expect(updated!.name).toBe('Finke');
    expect(updated!.id).toBe('finke');
  });

  it('updateJuror() persists changes', () => {
    store.updateJuror('finke', { active: true });
    const jurors = store.getJurors();
    const finke = jurors.find((j) => j.id === 'finke');
    expect(finke!.active).toBe(true);
  });

  it('updateJuror() returns null for unknown jurorId', () => {
    const result = store.updateJuror('unknown-juror', { active: true });
    expect(result).toBeNull();
  });

  it('initializes from seed.json if session.json does not exist', () => {
    // Delete session.json
    fs.unlinkSync(SESSION_FILE);
    expect(fs.existsSync(SESSION_FILE)).toBe(false);

    // Manually call the initialization logic by writing seed
    const seedData = fs.readFileSync(SEED_FILE, 'utf-8');
    fs.writeFileSync(SESSION_FILE, seedData, 'utf-8');

    // Verify the store reads correctly
    const data = store.getStore();
    expect(data.session.id).toBe('unikat-2026');
    expect(data.teams).toHaveLength(11);
    expect(data.jurors).toHaveLength(6);
  });
});