/*
  单元测试脚本说明：
  该文件对应 project/backend/tests/quality-rules.spec.ts。
  运行脚本 run_unit_tests.ps1 会调用后端 Jest 环境执行正式测试文件。
*/

import {
  allowedNextStatuses,
  canReadTicket,
  canTransition,
  isSlaOverdue,
  resolveDeadline,
  slaStatus,
  validateAttachment
} from '../../project/backend/src/services/quality-rules';

describe('unit: ticket status rules', () => {
  it('allows pending ticket to enter processing', () => {
    expect(canTransition('pending', 'processing')).toBe(true);
  });

  it('rejects pending ticket resolved directly', () => {
    expect(canTransition('pending', 'resolved')).toBe(false);
  });

  it('returns immutable next status list', () => {
    const next = allowedNextStatuses('pending');
    next.push('closed');
    expect(allowedNextStatuses('pending')).toEqual(['processing', 'cancelled']);
  });
});

describe('unit: permission rules', () => {
  const acl = {
    creatorId: 'customer-1',
    ownerId: 'engineer-1',
    companyUserIds: ['customer-1', 'customer-2']
  };

  it('allows admin to read every ticket', () => {
    expect(canReadTicket('admin-1', 'admin', acl)).toBe(true);
  });

  it('rejects unrelated customer', () => {
    expect(canReadTicket('customer-3', 'customer', acl)).toBe(false);
  });
});

describe('unit: SLA rules', () => {
  const createdAt = new Date('2026-06-01T00:00:00.000Z');

  it('calculates urgent deadline within 4 hours', () => {
    expect(resolveDeadline({ priority: 'urgent', createdAt }).toISOString()).toBe('2026-06-01T04:00:00.000Z');
  });

  it('marks ticket warning in last 20 percent time window', () => {
    expect(slaStatus({ priority: 'high', createdAt, now: new Date('2026-06-01T20:00:00.000Z') })).toBe('warning');
  });

  it('marks unresolved ticket overdue after deadline', () => {
    expect(isSlaOverdue({ priority: 'urgent', createdAt, now: new Date('2026-06-01T04:01:00.000Z') })).toBe(true);
  });
});

describe('unit: attachment validation rules', () => {
  it('accepts png attachment under 10MB', () => {
    expect(validateAttachment({ name: 'error.png', sizeMb: 2 }).valid).toBe(true);
  });

  it('rejects unsupported executable file', () => {
    expect(validateAttachment({ name: 'tool.exe', sizeMb: 1 })).toEqual({ valid: false, reason: 'UNSUPPORTED_TYPE' });
  });
});