import type { Base } from '../sim/bases';
import type { HeatLevel } from '../sim/heat';
import { MISSION_SHAPE, type MissionType, type Offer } from '../sim/quests';

/**
 * What each job actually asks of you, in the words the people asking would use.
 * The point is that the four read as different *risks*, not different nouns.
 */
const BRIEFING: Record<MissionType, string> = {
  supply: 'drop the load and come back — quick work at the far end',
  retrieval: 'collect and carry it home; it pays for what arrives intact',
  intel: 'sit still and transmit, a long minute in the open',
  recon: 'eyes on the area — you will come back knowing the roads',
};

/**
 * The quest board. Deliberately words, not numbers: the player is reading a
 * briefing, not a stat sheet. "Barricaded, four minutes ago" is a decision;
 * "heat 0.62" is a spreadsheet.
 */
const LEVEL_WORDS: Record<HeatLevel, string> = {
  clear: 'quiet',
  patrol: 'patrolled',
  barricade: 'barricaded',
  turret: 'fortified',
};

function ago(seconds: number): string {
  if (seconds < 90) return 'just now';
  const minutes = Math.round(seconds / 60);
  return `${minutes} min ago`;
}

function describe(offer: Offer): string {
  const { worst, unknownCount, stalest } = offer.intel;
  const total = offer.route.segments.length;

  if (unknownCount === total) return 'no one has been down that way';
  if (unknownCount > 0) {
    return `${LEVEL_WORDS[worst]} as far as we know · ${unknownCount} of ${total} roads unscouted`;
  }
  return `${LEVEL_WORDS[worst]}${stalest === null ? '' : ` · last word ${ago(stalest)}`}`;
}

export function createBoard() {
  const el = document.createElement('div');
  el.id = 'board';
  document.body.appendChild(el);

  const style = document.createElement('style');
  style.textContent = `
    #board {
      position: fixed; left: 50%; bottom: 36px; transform: translateX(-50%);
      width: min(680px, calc(100vw - 32px));
      font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
      color: #dbe2e8; background: rgba(12,15,19,.92);
      border: 1px solid #2f3944; border-radius: 6px; padding: 14px 16px;
      display: none;
    }
    #board.open { display: block; }
    #board h2 { font-size: 13px; font-weight: 600; margin: 0 0 10px; color: #8fa3b5; }
    #board ol { list-style: none; margin: 0; padding: 0; }
    #board li { padding: 7px 0; border-top: 1px solid #202832; }
    #board .key { color: #4ea3ff; }
    #board .novel { color: #e2b04a; }
    #board .meta { color: #7d8b98; }
    #board footer { margin-top: 10px; color: #6d7883; }
  `;
  document.head.appendChild(style);

  return {
    show(base: Base, offers: Offer[]) {
      el.classList.add('open');
      el.innerHTML = `
        <h2>${base.name} — quest board</h2>
        <ol>${offers
          .map(
            (offer, i) => `
          <li>
            <span class="key">[${i + 1}]</span>
            ${MISSION_SHAPE[offer.type].label} —
            ${offer.novel ? '<span class="novel">new target</span>' : 'known target'}
            · ${(offer.route.length / 1000).toFixed(1)} km
            · ${offer.reward.toFixed(2)} parts
            <div class="meta">${BRIEFING[offer.type]}</div>
            <div class="meta">${describe(offer)}</div>
          </li>`,
          )
          .join('')}</ol>
        <footer>press 1–${offers.length} to accept</footer>`;
    },

    /**
     * What a base has to say to somebody who turns up still carrying a job.
     *
     * There has to be a way out of a mission. A target can end up behind
     * concrete you cannot get round, and until now the only exit was holding R
     * for five seconds — which does not drop the job, it destroys the campaign.
     */
    showActive(base: Base, label: string) {
      el.classList.add('open');
      el.innerHTML = `
        <h2>${base.name}</h2>
        <ol><li>
          You are still carrying: ${label}.
          <div class="meta">Nobody here will take it off your hands, and nobody
          here will hold the board open while you decide.</div>
        </li></ol>
        <footer><span class="key">[X]</span> give it up — we lose ground for it</footer>`;
    },

    hide() {
      el.classList.remove('open');
    },
    get isOpen() {
      return el.classList.contains('open');
    },
  };
}