import type { MempoolTransaction } from './mempoolSpaceTypes'

const MEMPOOL_API_BASE = 'https://mempool.space/api'

export async function getTransaction(txid: string): Promise<MempoolTransaction | null> {
  try {
    const response = await fetch(`${MEMPOOL_API_BASE}/tx/${txid}`)

    if (!response.ok) {
      if (response.status === 404) {
        console.warn('Transaction not found on mempool.space', { txid })
        return null
      }
      throw new Error(`Failed to fetch transaction: ${response.status} ${response.statusText}`)
    }

    const transaction = await response.json() as MempoolTransaction
    return transaction
  } catch (error) {
    console.error('Error fetching transaction from mempool.space', {
      txid,
      error: error instanceof Error ? error.message : 'Unknown error',
      timestamp: new Date().toISOString(),
    })
    return null
  }
}

export async function getConfirmations(blockHeight: number): Promise<number> {
  try {
    const response = await fetch(`${MEMPOOL_API_BASE}/blocks/tip/height`)
    if (!response.ok) {
      return 0
    }
    const currentHeight = await response.json() as number
    return Math.max(0, currentHeight - blockHeight + 1)
  } catch (error) {
    console.error('Error getting current block height', {
      error: error instanceof Error ? error.message : 'Unknown error',
    })
    return 0
  }
}