// __tests__/monitor/availability-engine.test.ts
import { AvailabilityEngine } from '../../src/lib/monitor/availability-engine'

// Mock getDb
jest.mock('../../src/lib/db', () => ({
  getDb: () => ({
    prepare: () => ({
      get: () => ({ total: 0 }),
      all: () => [],
      run: () => {},
    }),
  }),
}))

describe('AvailabilityEngine', () => {
  const engine = new AvailabilityEngine()

  it('should calculate days in month correctly', () => {
    expect(engine.getDaysInMonth('2026-03')).toBe(31)
    expect(engine.getDaysInMonth('2026-02')).toBe(28)
    expect(engine.getDaysInMonth('2026-04')).toBe(30)
  })

  it('should calculate OEM diag deadline (first tier only)', () => {
    const deadline = engine.calculateOemDiagDeadline('2026-03', '2026-03-10 16:44:01')
    expect(deadline).toBeTruthy()
    // 31 days = 2678400 seconds, 1% = 26784 seconds ≈ 7.44 hours
    const fault = new Date('2026-03-10T16:44:01+08:00')
    const deadlineStr = deadline as string
    const deadlineDate = new Date(deadlineStr.replace(' ', 'T') + '+08:00')
    const diffHours = (deadlineDate.getTime() - fault.getTime()) / (1000 * 3600)
    expect(diffHours).toBeCloseTo(7.44, 1)
  })

  it('should calculate tier deadlines', () => {
    const deadlines = engine.calculateTierDeadlines('2026-03', 'SN123', '2026-03-10 16:44:01')
    expect(deadlines['第一档']).toBeTruthy()
    expect(deadlines['第一档'].deadline).not.toBe('已超出')
    expect(deadlines['第一档'].hours).toBeGreaterThan(0)
  })

  it('should format deadline in UTC+8', () => {
    const deadline = engine.calculateOemDiagDeadline('2026-03', '2026-03-10 16:44:01')
    // 应该是 UTC+8 格式，不是 UTC
    expect(deadline).toMatch(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/)
  })
})