import { listSpielplanSeasons, readSpielplanData, validateSeasonSlug } from '../../utils/spielplan-data.js'

function teamLabel(teamName, teamAgeGroup) {
  const name = String(teamName || '').trim()
  const age = String(teamAgeGroup || '').trim()
  if (!name) return ''
  const isYouth = age.toLowerCase().includes('jugend') || name.toLowerCase().includes('jugend')
  return isYouth ? `(J) ${name}` : name
}

function extractHarheimerTeams(rows) {
  const seen = new Set()
  const teams = []

  const addTeam = (teamName, teamAgeGroup) => {
    const name = String(teamName || '').trim()
    if (!name) return
    const age = String(teamAgeGroup || '').trim()
    const key = `${name}||${age}`
    if (seen.has(key)) return
    seen.add(key)
    teams.push({
      key,
      label: teamLabel(name, age),
      teamName: name,
      teamAgeGroup: age
    })
  }

  for (const row of rows || []) {
    if (String(row.HeimVereinName || '').trim() === 'Harheimer TC') {
      addTeam(row.HeimMannschaft, row.HeimMannschaftAltersklasse)
    }
    if (String(row.GastVereinName || '').trim() === 'Harheimer TC') {
      addTeam(row.GastMannschaft, row.GastMannschaftAltersklasse)
    }
  }

  return teams.sort((a, b) => a.label.localeCompare(b.label, 'de'))
}

export default defineEventHandler(async (event) => {
  const query = getQuery(event)
  if (query.season && !validateSeasonSlug(query.season)) {
    throw createError({
      statusCode: 400,
      message: 'Ungültiger Saison-Slug.'
    })
  }

  const seasons = await listSpielplanSeasons()
  const selectedSeason = String(query.season || seasons[0]?.slug || '')
  const dataResult = await readSpielplanData(selectedSeason ? { season: selectedSeason } : {})

  return {
    success: true,
    selectedSeason,
    seasons,
    teams: extractHarheimerTeams(dataResult.data)
  }
})