import { state } from './state.js';
import { ldoc } from './i18n.js';

export function tOff(g) {
  return Math.round((state.TODAY - new Date(g.start)) / 86400000);
}

export function o2d(g, i) {
  const d = new Date(new Date(g.start).getTime() + i * 86400000);
  d.setHours(0,0,0,0);
  return d;
}

export function dTot(g, o) {
  return (g.sets[String(o)] || []).reduce((a, b) => a + b.amount, 0);
}

export function fd(d) {
  return d.toLocaleDateString(ldoc(), { weekday: 'short', day: 'numeric', month: 'short' });
}

export function fs(d) {
  return d.toLocaleDateString(ldoc(), { day: 'numeric', month: 'short' });
}

export function editable(g, o) {
  const t = tOff(g);
  return o === t || o === t - 1;
}

export function now() {
  const n = new Date();
  return String(n.getHours()).padStart(2, '0') + ':' + String(n.getMinutes()).padStart(2, '0');
}

export function heuteColor(tdone, daily) {
  if (tdone === 0) return 'var(--red)';
  if (tdone >= daily * 1.1) return 'var(--blue)';
  if (tdone >= daily) return 'var(--green)';
  return 'var(--amber)';
}

export function isCollapsed(id) {
  return state.collapsed[id] !== false;
}

export function toggleCollapse(id) {
  const wasCollapsed = isCollapsed(id);
  state.collapsed[id] = !wasCollapsed;
  if (wasCollapsed) {
    const g = state.goals.find(x => x.id === id);
    if (g) state.selDay[id] = tOff(g);
  }
}

export function calc(g) {
  const t = tOff(g), tot = g.daily * g.days;
  const dr = Math.max(0, g.days - t - 1);
  const sd = new Date(g.start); sd.setHours(0,0,0,0);
  const end = new Date(sd.getTime() + g.days * 86400000);
  let past = 0;
  for (let i = 0; i < Math.min(t, g.days); i++) past += dTot(g, i);
  const tdone = dTot(g, t), tot2 = past + tdone;
  const dl = dr + 1;
  const remaining = Math.max(0, tot - past);
  const pd = Math.ceil(remaining / Math.max(1, dl));
  const st = Math.max(0, pd - tdone);
  const expectedPast = Math.min(t, g.days) * g.daily;
  const buf = Math.floor((past - expectedPast) + Math.max(0, tdone - g.daily));
  const deficit = Math.min(0, buf);
  const surplus = Math.max(0, buf);
  const dailyDelta = pd - g.daily;
  const pct = Math.min(100, Math.round((tot2 / tot) * 100));
  return { tot, tOff: t, end, dr, done: tot2, tdone, pd, st, buf, deficit, surplus, dailyDelta, net: tdone - pd, pct, ok: tdone >= pd };
}

export function dcls(g, i) {
  const t = tOff(g);
  if (i > t) return 'dot df';
  const v = dTot(g, i);
  const c = v === 0 ? 'dot dm' : v >= g.daily * 1.1 ? 'dot db' : v >= g.daily ? 'dot dd' : 'dot dp';
  return c + (editable(g, i) ? ' de' : ' dl');
}

export function dlbl(g, i) {
  const t = tOff(g);
  if (i > t) return String(i + 1);
  const v = dTot(g, i);
  if (v === 0) return '✕';
  if (v >= g.daily * 1.1) return '+';
  if (v >= g.daily) return '✓';
  return Math.round(v / g.daily * 100) + '%';
}