// server/supabase/functions/audio-purge/queue-adapter.ts
// AudioPurgeQueuePort over the service-role RPCs from
// 20260929000004_audio_retention_on_delete.sql.

import type { SupabaseClient } from '@supabase/supabase-js'
import type { AudioPurgeQueuePort } from './handler.ts'
import type { PurgeQueueEntry } from './policy.ts'

function toId(value: unknown): number | null {
  if (typeof value === 'number' && Number.isSafeInteger(value) && value > 0) return value
  if (typeof value === 'string' && /^[1-9][0-9]{0,15}$/.test(value)) {
    const parsed = Number(value)
    return Number.isSafeInteger(parsed) ? parsed : null
  }
  return null
}

/** Rows returned by claim_audio_purge_batch_v1; malformed rows are skipped (their lease expires). */
export function parseClaimedRows(data: unknown): PurgeQueueEntry[] {
  if (!Array.isArray(data)) return []
  const entries: PurgeQueueEntry[] = []
  for (const row of data) {
    if (typeof row !== 'object' || row === null) continue
    const record = row as Record<string, unknown>
    const id = toId(record.id)
    if (
      id === null
      || typeof record.user_id !== 'string'
      || typeof record.storage_key !== 'string'
      || typeof record.lease_token !== 'string'
    ) continue
    entries.push({ id, userId: record.user_id, storageKey: record.storage_key, leaseToken: record.lease_token })
  }
  return entries
}

type RpcClient = Pick<SupabaseClient, 'rpc'>

export function supabaseAudioPurgeQueue(client: RpcClient): AudioPurgeQueuePort {
  return {
    async claim(limit, leaseSeconds) {
      const { data, error } = await client.rpc('claim_audio_purge_batch_v1', {
        p_limit: limit,
        p_lease_seconds: leaseSeconds,
      })
      if (error) throw new Error('audio_purge_claim_failed')
      return parseClaimedRows(data)
    },
    async complete(ids, leaseToken) {
      const { data, error } = await client.rpc('complete_audio_purge_v1', {
        p_ids: ids,
        p_lease_token: leaseToken,
      })
      if (error) throw new Error('audio_purge_complete_failed')
      return typeof data === 'number' ? data : 0
    },
  }
}