import { createClient } from '@/lib/supabase/server'
import { NextResponse } from 'next/server'
import { generateResultatrapport } from '@/lib/reports/resultatrapport'
import { requireCompanyId } from '@/lib/company/context'
import { parseReportDateRange } from '@/lib/reports/date-range'

export async function GET(request: Request) {
  const supabase = await createClient()
  const { data: { user } } = await supabase.auth.getUser()

  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  const companyId = await requireCompanyId(supabase, user.id)

  const { searchParams } = new URL(request.url)
  const periodId = searchParams.get('period_id')

  if (!periodId) {
    return NextResponse.json({ error: 'period_id is required' }, { status: 400 })
  }

  const { data: period } = await supabase
    .from('fiscal_periods')
    .select('period_start, period_end')
    .eq('id', periodId)
    .eq('company_id', companyId)
    .single()

  let range: { fromDate?: string; toDate?: string } = {}
  if (period) {
    const parsed = parseReportDateRange(searchParams, period)
    if (!parsed.ok) {
      return NextResponse.json({ error: parsed.error }, { status: 400 })
    }
    range = parsed.range
  }

  try {
    const result = await generateResultatrapport(supabase, companyId, periodId, range)
    return NextResponse.json({ data: result })
  } catch (err) {
    return NextResponse.json(
      { error: err instanceof Error ? err.message : 'Failed to generate resultatrapport' },
      { status: 500 }
    )
  }
}