/**
 * js/dev/NavDiag.js — in-game diagnostics for the SYSTEM category's NAV chart.
 *
 * Installed by js/main.js on every real page load (index.html). Read-only and
 * defensive: it observes the live game and prints a report — it never mutates
 * state.
 *
 * The jumpgate tech unlocks only when EVERY NAV point of the current system
 * is discovered (js/research/SystemCategory.js — navChart). This tells you
 * exactly which ones are still missing, so "I visited everything but the
 * gates stay locked" resolves in one glance instead of by guesswork.
 *
 * Console commands (DevTools → Console, in the RUNNING game — the space view,
 * not a planet surface):
 *
 *   orbitNav()        → full chart (also logged). Copy-paste the returned
 *                       string when asking for help.
 *   orbitNavBrief()   → one-line summary.
 *
 * If `orbitNav` is NOT DEFINED in your console, the browser served an OLDER
 * js/main.js (stale module cache) — hard-reload with the cache bypassed
 * (Ctrl+Shift+R, or DevTools → Network → Disable cache) and check again. The
 * version marker below changes with each revision.
 */
import { config } from '../config/Config.js';
import { navChart } from '../research/SystemCategory.js';

export const NAV_DIAG_V = 1;

const KIND_LABEL = {
  home: 'central body',
  planet: 'planet',
  station: 'space station',
  gate: 'jump gate',
};

function sceneOf(key) {
  try {
    return globalThis.window?.game?.scene?.getScene(key) ?? null;
  } catch {
    return null;
  }
}

/**
 * The current system's live NAV chart, with readable names + type labels
 * (resolved from the scene's discoverable set — the same names the compass
 * and discovery toasts show).
 */
function chartOf(gs) {
  const systemId = gs?.systemRecord?.id ?? null;
  const system = gs?.systemRecord?.name ?? systemId ?? '?';
  const chart = navChart(gs?.discovery, systemId, gs?.systemContent);
  const names = new Map((gs?.discoverableObjects?.() ?? []).map((o) => [o.id, o]));
  const points = chart.points.map((p) => {
    const o = names.get(p.id);
    const name = o?.name ?? (p.id === 'home' ? gs?.homeWorldName ?? p.id : p.id);
    return { ...p, name, typeLabel: o?.typeLabel ?? KIND_LABEL[p.kind] ?? p.kind };
  });
  return { system, systemId, chart, points };
}

const ABSENT = `[orbit-nav v${NAV_DIAG_V}] GameScene absent — run this from the space view (not a planet surface)`;

/** One-line summary — the same facts a support request needs. */
export function brief() {
  const gs = sceneOf('GameScene');
  if (!gs) {
    console.info(ABSENT);
    return ABSENT;
  }
  const { system, systemId, chart, points } = chartOf(gs);
  const missing = points.filter((p) => !p.discovered).map((p) => p.name);
  const state = chart.complete
    ? 'COMPLETE → jumpgates RESEARCHABLE'
    : 'INCOMPLETE → jumpgates LOCKED';
  const line =
    `[orbit-nav v${NAV_DIAG_V}] ` +
    `system=${system}[${systemId ?? '?'}] ` +
    `chart=${chart.discovered}/${chart.total} ${state} ` +
    `missing=${JSON.stringify(missing)}`;
  console.info(line);
  return line;
}

/** Full report. Logs it, returns the string (copy-paste friendly). */
export function full() {
  const gs = sceneOf('GameScene');
  if (!gs) {
    console.info(ABSENT);
    return ABSENT;
  }
  const { system, systemId, chart, points } = chartOf(gs);
  const dist = config.get('game.discovery.distance', 540);
  const state = chart.complete
    ? 'COMPLETE — the jumpgate tech should be RESEARCHABLE'
    : 'INCOMPLETE — the jumpgate tech is LOCKED';
  const missing = points.filter((p) => !p.discovered);
  const lines = [
    `ORBIT NAV CHART v${NAV_DIAG_V}`,
    `[system] ${system}  [${systemId ?? '?'}]`,
    `[chart] ${chart.discovered} of ${chart.total} NAV points discovered  →  ${state}`,
  ];
  for (const p of points) {
    lines.push(
      `  ${p.discovered ? '✓' : '✗'}  ${p.kind.padEnd(7)}  ${String(p.name).padEnd(22)}  ` +
        `(${p.typeLabel})${p.discovered ? '' : '   ← undiscovered'}`,
    );
  }
  if (missing.length) {
    lines.push(`[missing] ${missing.map((p) => p.name).join(', ')}`);
    lines.push(
      `[tip] fly within ${dist} px of each missing object to discover it — ` +
        'jump gates and free-space stations are the ones easy to fly past',
    );
  } else {
    lines.push(`[ok] every NAV point is discovered — research the jumpgate tech in the console`);
  }
  const text = lines.join('\n');
  console.info(text);
  return text;
}

/** Install the console commands. Idempotent. */
export function installNavDiag() {
  if (typeof globalThis === 'undefined') return;
  if (!globalThis.addEventListener) return;
  globalThis.orbitNav = () => full();
  globalThis.orbitNavBrief = () => brief();
  console.info(`[orbit-nav v${NAV_DIAG_V}] installed — type orbitNav() in the console to see this system's NAV chart`);
}