/**
 * Scrape English Wikipedia for World Cup data and write JSON files to
 * app/data/wikipedia/{year}/.
 *
 * Usage:
 *   pnpm scrape                  # all years, matches + squads
 *   pnpm scrape 2022             # single year, matches + squads
 *   pnpm scrape 2022 --matches   # matches + meta + stadiums only
 *   pnpm scrape 2022 --squads    # squads only
 */
import { mkdirSync, writeFileSync } from 'fs'
import path from 'path'
import { fileURLToPath } from 'url'
import {
  fetchWikiHtml, scrapeYear, scrapeSquads,
  type Match, type Stadium, type Group, type Meta, type Squad,
} from '../lib/wiki-scraper'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const DATA_DIR = path.join(__dirname, '../app/data/wikipedia')

const YEARS = [
  1930,1934,1938,1950,1954,1958,1962,1966,1970,1974,
  1978,1982,1986,1990,1994,1998,2002,2006,2010,2014,2018,2022,
]

const delay = (ms: number) => new Promise(r => setTimeout(r, ms))

// ── File output ────────────────────────────────────────────────────────────

function writeMatches(
  year: number,
  matches: Match[],
  stadiums: Map<string, Stadium>,
  groups: Map<string, Set<string>>,
  meta: Meta,
): void {
  const dir = path.join(DATA_DIR, String(year))
  mkdirSync(dir, { recursive: true })

  writeFileSync(path.join(dir, 'worldcup.meta.json'),    JSON.stringify(meta, null, 2),             'utf-8')
  writeFileSync(path.join(dir, 'worldcup.json'),         JSON.stringify({ matches }, null, 2),      'utf-8')

  if (stadiums.size > 0)
    writeFileSync(path.join(dir, 'worldcup.stadiums.json'),
      JSON.stringify({ stadiums: Array.from(stadiums.values()) }, null, 2), 'utf-8')

  const groupList: Group[] = []
  groups.forEach((teams, name) => groupList.push({ name, teams: Array.from(teams) }))
  if (groupList.length > 0)
    writeFileSync(path.join(dir, 'worldcup.groups.json'),
      JSON.stringify({ groups: groupList }, null, 2), 'utf-8')
}

function writeSquads(year: number, squads: Squad[]): void {
  if (squads.length === 0) return
  const dir = path.join(DATA_DIR, String(year))
  mkdirSync(dir, { recursive: true })
  writeFileSync(path.join(dir, 'worldcup.squads.json'), JSON.stringify(squads, null, 2), 'utf-8')
}

// ── Entry point ────────────────────────────────────────────────────────────

async function main() {
  const args = process.argv.slice(2)
  const yearArg = args.find(a => /^\d{4}$/.test(a))
  const doMatches = args.includes('--matches') || !args.includes('--squads')
  const doSquads  = args.includes('--squads')  || !args.includes('--matches')

  const yearsToScrape = yearArg ? [parseInt(yearArg)] : YEARS
  const modeLabel = [doMatches && 'matches', doSquads && 'squads'].filter(Boolean).join(' + ')

  console.log(`Scraping ${yearsToScrape.length} World Cup(s) from Wikipedia [${modeLabel}]...`)

  for (const year of yearsToScrape) {
    process.stdout.write(`  ${year}... `)

    if (doMatches) {
      const mainHtml = await fetchWikiHtml(`${year}_FIFA_World_Cup`)
      if (!mainHtml) { console.log('FAILED (main page)'); continue }
      const { matches, stadiums, groups, meta } = await scrapeYear(year, mainHtml)
      writeMatches(year, matches, stadiums, groups, meta)
      process.stdout.write(`${matches.length} matches`)
      await delay(600)
    }

    if (doSquads) {
      const squadHtml = await fetchWikiHtml(`${year}_FIFA_World_Cup_squads`)
      const squads = squadHtml ? scrapeSquads(squadHtml) : []
      writeSquads(year, squads)
      process.stdout.write(`${doMatches ? ', ' : ''}${squads.length} squads`)
      await delay(600)
    }

    console.log()
  }

  console.log('\nDone! Files written to app/data/wikipedia/{year}/')
}

main().catch(e => { console.error(e); process.exit(1) })