import { describe, it, expect } from 'vitest'
import { isWithinSchedule } from '../../../app/utils/schedule_window.js'
import type { ScheduleWindow } from '../../../app/domain/configuration/configuration.js'

describe('isWithinSchedule', () => {
  it('returns true when schedule is undefined', () => {
    expect(isWithinSchedule(undefined)).toBe(true)
  })

  it('returns true when within a normal window (non-midnight-spanning)', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [1, 2, 3, 4, 5], // Mon-Fri
      startHour: 2,
      endHour: 6,
      timezone: 'UTC',
    }
    // Wednesday at 03:00 UTC
    const now = new Date('2025-01-08T03:00:00Z')
    expect(isWithinSchedule(schedule, now)).toBe(true)
  })

  it('returns false when outside a normal window', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [1, 2, 3, 4, 5],
      startHour: 2,
      endHour: 6,
      timezone: 'UTC',
    }
    // Wednesday at 10:00 UTC
    const now = new Date('2025-01-08T10:00:00Z')
    expect(isWithinSchedule(schedule, now)).toBe(false)
  })

  it('returns false when at the endHour boundary (exclusive)', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [1, 2, 3, 4, 5],
      startHour: 2,
      endHour: 6,
      timezone: 'UTC',
    }
    // Wednesday at 06:00 UTC (endHour is exclusive)
    const now = new Date('2025-01-08T06:00:00Z')
    expect(isWithinSchedule(schedule, now)).toBe(false)
  })

  it('handles midnight-spanning window (startHour > endHour)', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [0, 1, 2, 3, 4, 5, 6],
      startHour: 22,
      endHour: 6,
      timezone: 'UTC',
    }
    // At 23:00 UTC - should be within
    expect(isWithinSchedule(schedule, new Date('2025-01-08T23:00:00Z'))).toBe(true)
    // At 03:00 UTC - should be within
    expect(isWithinSchedule(schedule, new Date('2025-01-08T03:00:00Z'))).toBe(true)
    // At 10:00 UTC - should be outside
    expect(isWithinSchedule(schedule, new Date('2025-01-08T10:00:00Z'))).toBe(false)
  })

  it('filters by day of week', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [1, 2, 3, 4, 5], // Mon-Fri only
      startHour: 0,
      endHour: 23,
      timezone: 'UTC',
    }
    // Saturday 2025-01-11 at 10:00 UTC
    const saturday = new Date('2025-01-11T10:00:00Z')
    expect(isWithinSchedule(schedule, saturday)).toBe(false)

    // Monday 2025-01-06 at 10:00 UTC
    const monday = new Date('2025-01-06T10:00:00Z')
    expect(isWithinSchedule(schedule, monday)).toBe(true)
  })

  it('handles IANA timezone conversion', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [0, 1, 2, 3, 4, 5, 6],
      startHour: 2,
      endHour: 6,
      timezone: 'Europe/Paris', // UTC+1 in winter
    }
    // 03:00 UTC = 04:00 Paris time → within [2, 6)
    expect(isWithinSchedule(schedule, new Date('2025-01-08T03:00:00Z'))).toBe(true)
    // 00:00 UTC = 01:00 Paris time → outside [2, 6)
    expect(isWithinSchedule(schedule, new Date('2025-01-08T00:00:00Z'))).toBe(false)
  })

  it('returns true when daysOfWeek is empty (no day restriction)', () => {
    const schedule: ScheduleWindow = {
      daysOfWeek: [],
      startHour: 2,
      endHour: 6,
      timezone: 'UTC',
    }
    // Any day at 03:00 UTC
    expect(isWithinSchedule(schedule, new Date('2025-01-08T03:00:00Z'))).toBe(true)
  })
})