// Ways the term can end early. Checked once per day after the economy has moved.
//
//   default      debt above the limit: immediate
//   impeachment  civil rights and opinion both very low for N days in a row: certain
//   coup         army loyalty and stability both very low: a daily chance that grows each day in the zone
//   revolution   unrest very high and opinion very low: same growing daily chance
//
// Entering a danger zone queues an urgent telegram (state.alerts) and pauses the game
// until the player acknowledges it. state.risk counts the days spent in each zone.

import { nextFloat } from "./rng.js";

function alert(state, kind) {
  state.alerts.push({ kind, day: state.day });
  state.pending.alert = true;
}

// Returns the game-over type or null. Mutates state.risk, state.alerts and the RNG.
export function checkGameOver(state, bal) {
  const g = bal.gameOver;
  const ind = state.indicators;
  const risk = state.risk;
  const debtRatio = (state.economy.debt / state.economy.gdp) * 100;

  // Zone bookkeeping: count consecutive days inside, fade (or reset) outside.
  const track = (name, inZone, fade) => {
    if (inZone) {
      risk[name] += 1;
      if (risk[name] === 1) alert(state, name);
    } else {
      risk[name] = fade === "reset" ? 0 : Math.max(0, risk[name] - fade);
    }
  };
  const chance = (name, perDay) => risk[name] > 0 && nextFloat(state) < Math.min(1, perDay * risk[name]);

  if (debtRatio >= g.default.warnAbove) {
    if (!risk.defaultZone) {
      risk.defaultZone = true;
      alert(state, "default");
    }
  } else if (debtRatio < g.default.warnAbove - 10) {
    risk.defaultZone = false;
  }

  const inImpeachment = ind.civilRights < g.impeachment.civilRightsBelow && ind.opinion < g.impeachment.opinionBelow;
  const inCoup = (ind.armyLoyalty < g.coup.armyBelow && ind.stability < g.coup.stabilityBelow) || ind.armyLoyalty < (g.coup.armyAlone ?? 0);
  const inRevolution = ind.unrest > g.revolution.unrestAbove && ind.opinion < g.revolution.opinionBelow;
  track("impeachment", inImpeachment, "reset");
  track("coup", inCoup, 1);
  track("revolution", inRevolution, 1);

  if (debtRatio > g.default.debtAbove) return "default";
  if (risk.impeachment >= g.impeachment.days) return "impeachment";
  if (inCoup && chance("coup", g.coup.chancePerDay)) return "coup";
  if (inRevolution && chance("revolution", g.revolution.chancePerDay)) return "revolution";
  return null;
}

// The player has read the telegram at the front of the queue.
export function dismissAlert(state) {
  state.alerts.shift();
  state.pending.alert = state.alerts.length > 0;
}