import { describe, it, expect } from 'vitest'
import { readFileSync } from 'node:fs'
import { fileURLToPath } from 'node:url'
import { dirname, join } from 'node:path'
import { parseICS } from '../src/lib/ical-io.js'

const __dirname = dirname(fileURLToPath(import.meta.url))
const GOLDEN = readFileSync(join(__dirname, 'golden-org.ics'), 'utf-8')

describe('parseICS', () => {
  const { meta, events } = parseICS(GOLDEN)

  it('parses calendar meta', () => {
    expect(meta.prodid).toBe('-//Allocate//iCal4j 1.0//EN')
    expect(meta.version).toBe('2.0')
    expect(meta.calscale).toBe('GREGORIAN')
    expect(meta.vtimezones.length).toBe(1)
  })

  it('parses all 61 events', () => {
    expect(events).toHaveLength(61)
  })

  it('parses first event fields correctly', () => {
    const e = events[0]
    expect(e.summary).toBe('ACC INFO SYS, Tutorial')
    expect(e.location).toBe('CA_B_B471')
    expect(e.dtstartDate).toBe('2026-07-27')
    expect(e.dtstartTime).toBe('18:00')
    expect(e.dtendTime).toBe('20:00')
    expect(e.tzid).toBe('Australia/Melbourne')
    expect(e.rrule).toBeNull()
    expect(e.exdates).toEqual([])
  })

  it('preserves description with escaped commas', () => {
    const e = events[0]
    expect(e.description).toContain('ACF2400_CA_S2_ON-CAMPUS')
    expect(e.description).toContain('ACC INFO SYS')
  })

  it('captures dtstamp in _raw', () => {
    expect(events[0]._raw.dtstamp).toBe('20260711T085008Z')
  })

  it('events have UIDs', () => {
    expect(events[0].uid).toBe('uid0')
    expect(events[60].uid).toBe('uid60')
  })
})