// The faucet: pays due drips from the dedicated hot wallet. Amoy first, mainnet when Marty flips it.
//
//   HUNT_WALLET_KEY   the hot wallet's private key (env only; never on disk in the repo or volume)
//   HUNT_RPC          e.g. https://polygon-amoy-bor-rpc.publicnode.com (Amoy) or a mainnet RPC
//   HUNT_CHAIN_ID     80002 (Amoy) or 137 (mainnet)
//
// Every send is one plain POL transfer, recorded on the ledger with its tx hash. A failure marks
// the entry 'failed' with the reason and never retries by itself (a human looks). The balance is
// read on every tick; below lowBalancePol the alert fires once per day.
'use strict';
const { ethers } = require('ethers');
const rewards = require('./rewards');
const store = require('./store');

let provider = null, wallet = null, ticking = false;

function enabled() { return !!(process.env.HUNT_WALLET_KEY && process.env.HUNT_RPC); }
function init() {
  if (!enabled()) return false;
  provider = new ethers.JsonRpcProvider(process.env.HUNT_RPC, Number(process.env.HUNT_CHAIN_ID) || undefined);
  wallet = new ethers.Wallet(process.env.HUNT_WALLET_KEY.trim(), provider);
  return true;
}
function address() { return wallet ? wallet.address : null; }
async function balance() { if (!provider || !wallet) return null; const b = await provider.getBalance(wallet.address); return Number(ethers.formatEther(b)); }

async function tick(notify) {
  if (!wallet || ticking) return { paid: 0 };
  ticking = true;
  let paid = 0;
  try {
    const due = rewards.payable();
    for (const p of due) {
      if (!p.wallet || !/^0x[a-f0-9]{40}$/i.test(p.wallet)) { rewards.mark(p.id, { status: 'failed', error: 'no wallet on the account' }); continue; }
      try {
        const tx = await wallet.sendTransaction({ to: p.wallet, value: ethers.parseEther(String(p.pol)) });
        rewards.mark(p.id, { status: 'sent', tx: tx.hash });
        const rc = await tx.wait(1);
        rewards.mark(p.id, { status: rc && rc.status === 1 ? 'paid' : 'failed', paidAt: Date.now(), error: rc && rc.status === 1 ? null : 'reverted' });
        if (rc && rc.status === 1) { paid++; if (notify) await notify('paid', Object.assign({}, p, { tx: tx.hash })); }
      } catch (e) {
        rewards.mark(p.id, { status: 'failed', error: String(e.message || e).slice(0, 200) });
        if (notify) await notify('failed', Object.assign({}, p, { error: String(e.message || e).slice(0, 200) }));
      }
    }
    // low-balance alert, once a day
    const bal = await balance();
    if (bal != null) {
      const s = rewards.settings(); const st = store.read('faucet-state', {});
      const day = new Date().toLocaleDateString('en-CA', { timeZone: 'America/Chicago' });
      if (bal < Number(s.lowBalancePol) && st.lowAlertDay !== day) { st.lowAlertDay = day; store.write('faucet-state', st); if (notify) await notify('low', { balance: bal, threshold: s.lowBalancePol, address: wallet.address }); }
      store.update('faucet-state', {}, x => Object.assign(x, { balance: bal, checkedAt: Date.now() }));
    }
  } finally { ticking = false; }
  return { paid };
}

module.exports = { enabled, init, address, balance, tick };