// Advertiser-funded missions (Marty, 2026-09-24).
//
// A member buys a mission: they pay POL into the faucet wallet, and hunters who complete it are
// dripped out of what they paid. Two rules follow from that, and everything here exists to hold
// them:
//
//   1. A paid completion is NOT house spend. It does not count against dailyCapPol, and it does
//      not use up one of the hunter's missionsPerDay. Each live paid mission raises that hunter's
//      allowance by one, because the company is not funding it. ("Each additional mission paid by
//      an advertiser should allow +1 above the cap.")
//
//   2. THE SOLVENCY RULE. The faucet is one wallet holding house float AND every advertiser's
//      unspent reserve. If reserves ever exceed the balance we have sold delivery we cannot pay
//      for, and a hunter completes a mission only to watch the drip fail. So:
//
//          faucet balance  >=  house float  +  sum(outstanding reserves)
//
//      checked before a sale is accepted, never after.
//
// Money in is split at purchase: the hunter payout is reserved, the rest is company margin the
// P&L can recognise. The advertiser sets the hunter payout themselves (base 0.30, they may pay
// more to get completed sooner), so the reserve is exact rather than estimated. No draw, no
// variance, no guessing.
'use strict';
const store = require('./store');

const DEFAULTS = {
  paidEnabled: 1,
  paidBaseHunterPol: 0.30,   // the floor an advertiser may set as the hunter's payout
  // The company's share, on the SAME BASIS as InstantAdPay's platform 20%: a percentage of what
  // the advertiser pays, not a mark-up on the reserve. So at 20 the hunters get 80% of the
  // purchase and the house keeps 20, which is the number members already understand.
  paidMarginPct: 20,
  paidMinBlock: 100,         // completions per block
  paidMaxConcurrent: 0,      // 0 = no limit; supply is elastic now that paid missions add capacity
  // Every drip is its own transaction and the faucet pays the gas. Measured at 0.0060 POL across
  // recent payouts (21,000 gas, the plain-transfer floor); held at 0.01 so a busy chain cannot
  // turn a sold mission into a shortfall. Without this the gas came quietly out of house money.
  paidGasPol: 0.01,
  // Marty, 2026-09-24: happy to hold more back than the arithmetic demands. Applied to drips and
  // gas together, so a failed-and-retried send or a price spike is already covered.
  paidReserveBufferPct: 10,
  paidHouseFloatPol: 50,     // POL kept back for house missions, never counted as sellable
  // Priced in dollars because that is what a buyer judges; converted at the InstantAdPay
  // contract's own rate at purchase (Marty, 2026-09-24).
  paidBlockCents: 3000,      // $30 a block
  paidListingCents: 1000,    // $10, once per mission, charged AT APPROVAL after the review is done
  paidListingFreeBlocks: 4,  // a first order this size or larger gets the listing free
};
function cfg() { return Object.assign({}, DEFAULTS, store.read('settings', {})); }
const r4 = n => Math.round(Number(n) * 10000) / 10000;

// ---- what a block costs -----------------------------------------------------------------
// hunterPol is what each completing hunter receives; the advertiser pays that plus the margin.
function quote(hunterPol, completions) {
  const c = cfg();
  const hp = r4(Math.max(Number(c.paidBaseHunterPol), Number(hunterPol) || 0));
  const n = Math.max(Number(c.paidMinBlock), Math.round(Number(completions) || 0));
  // What must actually be held: the drips, the gas to send them, and the safety buffer.
  const drips = r4(hp * n);
  const gas = r4(Number(c.paidGasPol) * n);
  const buf = Math.max(0, Number(c.paidReserveBufferPct) || 0);
  const reserve = r4((drips + gas) * (1 + buf / 100));
  // Margin is a share of what the advertiser pays, the same basis as InstantAdPay's platform 20%.
  const pct = Math.min(90, Math.max(0, Number(c.paidMarginPct) || 0));
  const total = r4(reserve / (1 - pct / 100));
  return { hunterPol: hp, completions: n, drips, gas, bufferPct: buf, reserve,
    margin: r4(total - reserve), total, marginPct: pct };
}

// How many completions a block buys. The inverse of quote(): the advertiser fixes the spend and
// the payout they want hunters to get, and the completion count falls out.
//
// NOTE, because it is easy to get backwards: with a fixed-price block the house margin is the
// same whatever the payout. Raising the payout trades completions for SPEED at the same price,
// it does not earn the house more. Margin only moves with the number of blocks sold. So the
// upsell is "more blocks", and a higher payout is the reason a buyer needs more of them.
function blockFor(hunterPol, totalPol) {
  const c = cfg();
  const hp = r4(Math.max(Number(c.paidBaseHunterPol), Number(hunterPol) || 0));
  const gas = Number(c.paidGasPol) || 0;
  const buf = 1 + (Math.max(0, Number(c.paidReserveBufferPct) || 0) / 100);
  const pct = Math.min(90, Math.max(0, Number(c.paidMarginPct) || 0));
  const reserve = Number(totalPol) * (1 - pct / 100);
  const n = Math.floor(reserve / ((hp + gas) * buf));
  return Object.assign(quote(hp, n), { requestedPol: r4(Number(totalPol)) });
}

// What this order costs all in. The listing fee is charged ONCE per mission, at approval, because
// it pays for the review that has already happened by then. It is never charged again on that
// mission, and a first order of paidListingFreeBlocks or more waives it: a serious first buyer
// should not be taxed for the privilege.
function orderTotal(blocks, alreadyListed) {
  const c = cfg();
  const n = Math.max(1, Math.round(Number(blocks) || 1));
  const blockCents = Number(c.paidBlockCents) * n;
  const waived = alreadyListed || n >= Number(c.paidListingFreeBlocks);
  const listingCents = waived ? 0 : Number(c.paidListingCents);
  return { blocks: n, blockCents, listingCents, totalCents: blockCents + listingCents,
    listingWaived: waived, listingReason: alreadyListed ? 'already listed' : (waived ? 'waived, ' + n + ' blocks' : 'first order') };
}

// ---- reserves ---------------------------------------------------------------------------
const paidMissions = () => store.read('missions', []).filter(m => m.paid);

// completions already granted against a mission (failed ones do not count, they never paid)
function usedOf(missionId) {
  return store.read('payouts', []).filter(p => p.missionId === missionId && p.status !== 'failed' && !p.prize && !p.ref).length;
}

// what every live paid mission still owes its hunters
function outstanding() {
  let pol = 0, left = 0;
  const c = cfg();
  const gas = Number(c.paidGasPol) || 0;
  const buf = 1 + (Math.max(0, Number(c.paidReserveBufferPct) || 0) / 100);
  for (const m of paidMissions()) {
    const remaining = Math.max(0, Number(m.budget || 0) - usedOf(m.id));
    left += remaining;
    // reserved on the same basis it was sold on: drip + gas + buffer, per completion still owed
    pol += remaining * (Number(m.hunterPol || 0) + gas) * buf;
  }
  return { reservePol: r4(pol), completionsLeft: left, missions: paidMissions().length };
}

// THE guard. Given the faucet's real balance, can we take this sale?
function canSell(balancePol, addReservePol) {
  const c = cfg();
  const o = outstanding();
  const float = Number(c.paidHouseFloatPol) || 0;
  const committed = r4(o.reservePol + float + Number(addReservePol || 0));
  const bal = r4(Number(balancePol) || 0);
  return {
    ok: bal >= committed,
    balance: bal, committed, houseFloat: float,
    alreadyReserved: o.reservePol, adding: r4(Number(addReservePol) || 0),
    shortBy: bal >= committed ? 0 : r4(committed - bal),
  };
}

// ---- the hunter's allowance ---------------------------------------------------------------
// Base allowance is the company-funded missionsPerDay. Every live paid mission the hunter has
// not yet done adds one, because that completion costs the company nothing.
function extraAllowance(doneIds) {
  const done = doneIds instanceof Set ? doneIds : new Set(doneIds || []);
  return paidMissions().filter(m => m.active && !done.has(m.id) && Math.max(0, Number(m.budget || 0) - usedOf(m.id)) > 0).length;
}

function isPaid(missionId) {
  const m = store.read('missions', []).find(x => x.id === missionId);
  return !!(m && m.paid);
}

module.exports = { cfg, quote, blockFor, orderTotal, outstanding, canSell, extraAllowance, isPaid, usedOf, paidMissions };