import { Day } from '@/shared/model/day'
import { parsePage, ParseResult, WeekInfo } from '@/app/parser/schedule'
import contentTypeParser from 'content-type'
import { JSDOM } from 'jsdom'
// import { content as mockContent } from './mock'
import { reportParserError } from '@/app/logger'
import { PROXY_URL } from '@/shared/constants/urls'

export type ScheduleResult = {
  days: Day[]
  currentWk?: number
  availableWeeks?: WeekInfo[]
}

// ПС-7: 146
export async function getSchedule(groupID: number, groupName: string, wk?: number, parseWeekNavigation: boolean = true): Promise<ScheduleResult> {
  const url = `${PROXY_URL}/?mn=2&obj=${groupID}${wk ? `&wk=${wk}` : ''}`
  const page = await fetch(url)
  // const page = { text: async () => mockContent, status: 200, headers: { get: (s: string) => s && 'text/html' } }
  const content = await page.text()
  const contentType = page.headers.get('content-type')
  if (page.status === 200 && contentType && contentTypeParser.parse(contentType).type === 'text/html') {
    let dom: JSDOM | null = null
    try {
      dom = new JSDOM(content, { url })
      const root = dom.window.document
      const result = parsePage(root, groupName, url, parseWeekNavigation)
      const scheduleResult = {
        days: result.days,
        currentWk: result.currentWk || wk,
        availableWeeks: result.availableWeeks
      }
      // Явно очищаем JSDOM для освобождения памяти
      dom.window.close()
      dom = null
      return scheduleResult
    } catch(e) {
      // Очищаем JSDOM даже в случае ошибки
      if (dom) {
        dom.window.close()
      }
      console.error(`Error while parsing ${PROXY_URL}`)
      reportParserError(new Date().toISOString(), 'Не удалось сделать парсинг для группы', groupName)
      throw e
    }
  } else {
    console.error(page.status, contentType)
    console.error(content.length > 500 ? content.slice(0, 500 - 3) + '...' : content)
    reportParserError(new Date().toISOString(), 'Не удалось получить страницу для группы', groupName)
    throw new Error(`Error while fetching ${PROXY_URL}`)
  }
}