// 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
  paidMarginPct: 100,        // company margin on top of the hunter payout, as a percentage
  paidMinBlock: 100,         // completions per block
  paidMaxConcurrent: 0,      // 0 = no limit; supply is elastic now that paid missions add capacity
  paidHouseFloatPol: 25,     // POL kept back for house missions, never counted as sellable
};
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));
  const reserve = r4(hp * n);                                   // exact: no draw, so no buffer needed
  const margin = r4(reserve * (Number(c.paidMarginPct) / 100));
  return { hunterPol: hp, completions: n, reserve, margin, total: r4(reserve + margin) };
}

// ---- 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;
  for (const m of paidMissions()) {
    const remaining = Math.max(0, Number(m.budget || 0) - usedOf(m.id));
    left += remaining;
    pol += remaining * Number(m.hunterPol || 0);
  }
  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, outstanding, canSell, extraAllowance, isPaid, usedOf, paidMissions };