import { formatSessionDurationRange } from './trainingDurationUtils'

export function frameworkSessionDurationLabel(row) {
  return formatSessionDurationRange(row?.session_duration_min, row?.session_duration_max, {
    empty: 'Dauer nicht angegeben',
  })
}

function parseIdList(raw) {
  if (Array.isArray(raw)) {
    return raw.map((x) => String(x)).filter(Boolean)
  }
  if (typeof raw === 'string' && raw.trim().startsWith('[')) {
    try {
      const arr = JSON.parse(raw)
      if (Array.isArray(arr)) return arr.map((x) => String(x))
    } catch {
      /* ignore */
    }
  }
  return []
}

function rowMatchesDuration(row, targetMin, toleranceMin = 10) {
  if (targetMin == null || targetMin === '' || Number.isNaN(Number(targetMin))) return true
  const t = Number(targetMin)
  const lo = row.session_duration_min != null ? Number(row.session_duration_min) : null
  const hi = row.session_duration_max != null ? Number(row.session_duration_max) : null
  if (lo == null && hi == null) return true
  if (lo != null && hi != null) {
    return t >= lo - toleranceMin && t <= hi + toleranceMin
  }
  const single = lo ?? hi
  return single != null && Math.abs(single - t) <= toleranceMin
}

/**
 * Client-Filter für Rahmenprogramm-Auswahl (Liste / Import-Dialog).
 */
export function filterFrameworkPrograms(rows, filters = {}) {
  const q = (filters.query || '').trim().toLowerCase()
  const focusIds = new Set((filters.focusAreaIds || []).map(String))
  const typeIds = new Set((filters.trainingTypeIds || []).map(String))
  const tgIds = new Set((filters.targetGroupIds || []).map(String))
  const durationTarget = filters.durationTargetMin

  return (rows || []).filter((r) => {
    if (q) {
      const blob = [
        r.title,
        r.description,
        r.goal_titles_agg,
        r.focus_area_names_agg,
        r.style_direction_names_agg,
        r.training_type_names_agg,
        r.target_group_names_agg,
      ]
        .filter(Boolean)
        .join(' ')
        .toLowerCase()
      if (!blob.includes(q)) return false
    }

    if (focusIds.size) {
      const fa = parseIdList(r.focus_area_ids)
      if (!fa.some((id) => focusIds.has(id))) return false
    }
    if (typeIds.size) {
      const tt = parseIdList(r.training_type_ids)
      if (!tt.some((id) => typeIds.has(id))) return false
    }
    if (tgIds.size) {
      const tg = parseIdList(r.target_group_ids)
      if (!tg.some((id) => tgIds.has(id))) return false
    }

    if (!rowMatchesDuration(r, durationTarget)) return false
    return true
  })
}

export function frameworkProgramOptionLabel(row) {
  const title = (row?.title || '').trim() || `Rahmen #${row?.id}`
  const dur = frameworkSessionDurationLabel(row)
  const slots = row?.slots_count != null ? `${row.slots_count} Slot(s)` : ''
  const bits = [dur !== 'Dauer nicht angegeben' ? dur : null, slots].filter(Boolean)
  return bits.length ? `${title} · ${bits.join(' · ')}` : title
}