/**
 * js/dev/BuildDiag.js — in-game diagnostics for the Build console.
 *
 * Installed by js/main.js on every real page load (index.html). It is
 * deliberately read-only and defensive: it observes the live game and
 * prints a report — it never mutates state.
 *
 * Console commands (DevTools → Console, in the RUNNING game):
 *
 *   orbitDiag()          → full report (also logged). Copy-paste the
 *                          returned string when asking for help.
 *   orbitDiagBrief()     → one-line summary.
 *
 * The Build console ALSO logs the brief line itself every time it opens
 * (`[orbit-diag v…] planet=… L1=… L2=…`), so you do not have to remember
 * the command.
 *
 * If `orbitDiag` 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 { defById, rowState, missingRequirements, isShipScoped } from '../build/BuildModel.js';

export const DIAG_V = 4;

const _errors = [];
const _errCap = (msg) => {
  if (_errors.length < 8) _errors.push(String(msg).slice(0, 300));
};

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

function builtMapOf(gs) {
  const b = gs?.buildState?.built;
  if (!b || typeof b.entries !== 'function') return null;
  return Object.fromEntries([...b.entries()].map(([k, v]) => [k, [...v]]));
}

function homeNameOf(gs) {
  return gs?.planet?.discoveryName ?? gs?.homeWorldName ?? null;
}

function tetherFor(gs, name) {
  const list = gs?.tetherField?.tethers;
  if (!Array.isArray(list) || !name) return null;
  const hit = list.find((t) => t.label === name) ?? list.find((t) => t.x === 0 && t.y === 0);
  return hit ? { id: hit.id, level: hit.level, label: hit.label } : null;
}

/**
 * The exact row state the Build window paints for one build id, using
 * the same pure functions and context as js/ui/BuildWindow.js (SHIP-
 * scoped builds — the mining arms/storage — read isBuiltAnywhere, the
 * window's ctx does too).
 */
function rowFor(gs, ss, id) {
  const planet = ss?.planetName ?? homeNameOf(gs);
  const def = defById(id);
  if (!def || !planet) return 'NO DEF/PLANET';
  const shipScoped = isShipScoped(def);
  const ctx = {
    isResearchUnlocked: (c, n) => gs?.researchState?.isUnlocked?.(c, n) ?? false,
    tetherLevel: () => gs?.tetherLevelFor?.(planet) ?? 0,
    isBuilt: () =>
      shipScoped
        ? gs?.buildState?.isBuiltAnywhere?.(id) ?? false
        : gs?.buildState?.isBuilt?.(planet, id) ?? false,
  };
  const active = gs?.buildState?.getActive?.();
  const activeOnPlanet = active && active.planet === planet ? active : null;
  const st = rowState(def, ctx, activeOnPlanet, id);
  const missing = missingRequirements(def, ctx);
  return st.toUpperCase() + (missing.length ? ` (needs: ${missing.join(' + ')})` : '');
}

function saveBank() {
  try {
    const raw = globalThis.localStorage?.getItem?.('orbit.saves.v1');
    if (!raw) return null;
    const bank = JSON.parse(raw);
    const slots = Object.entries(bank.slots ?? {}).map(([slot, rec]) => ({
      slot,
      seed: rec?.record?.seed ?? rec?.seed ?? null,
      savedAt: rec?.savedAt ?? rec?.record?.savedAt ?? null,
      builds: rec?.record?.builds ?? null,
    }));
    return { key: 'orbit.saves.v1', slots };
  } catch (e) {
    return { error: String(e.message ?? e) };
  }
}

function pendingRestore() {
  try {
    const raw = globalThis.localStorage?.getItem?.('orbit.pendingRestore');
    if (!raw) return null;
    const rec = JSON.parse(raw);
    return { present: true, seed: rec?.seed ?? null, builds: rec?.builds ?? null };
  } catch (e) {
    return { error: String(e.message ?? e) };
  }
}

function dataFacts() {
  const out = { buildsLoaded: !!config.get('builds.categories', null) };
  const l1 = defById('tether-l1');
  const l2 = defById('tether-l2');
  out['tether-l1'] = l1
    ? { starting: l1.starting ?? null, repeatable: l1.repeatable ?? false }
    : 'NOT IN DATA (stale data/builds.json?)';
  out['tether-l2'] = l2
    ? {
        cost: l2.cost ?? null,
        duration: l2.duration ?? null,
        requires: l2.requires ?? null,
        planetRequires: l2.planetRequires ?? null,
      }
    : 'NOT IN DATA (stale data/builds.json?)';
  for (const id of ['mining-arm-improved', 'mining-arm-advanced', 'mining-storage-improved']) {
    const d = defById(id);
    out[id] = d
      ? { cost: d.cost ?? null, duration: d.duration ?? null, requires: d.requires ?? null, targets: d.targets ?? null, effects: d.effects ?? null }
      : 'NOT IN DATA (stale data/builds.json?)';
  }
  return out;
}

/** The ship's derived mining stats (the build effects land here). */
function miningStatsOf(gs) {
  const st = gs?.ship?.stats;
  return st
    ? { rate: st.miningSpeed ?? null, hold: gs?.ship?.minerals ?? null, cap: st.mineralStorage ?? null }
    : null;
}

/** One-line summary — the same facts a support request needs. */
export function brief() {
  const gs = sceneOf('GameScene');
  const ss = sceneOf('SurfaceScene');
  const home = homeNameOf(gs);
  const planet = ss?.planetName ?? home;
  const bm = builtMapOf(gs);
  const isHome = planet != null && planet === home;
  const t = tetherFor(gs, planet);
  const line =
    `[orbit-diag v${DIAG_V}] ` +
    `planet=${planet ?? '?'} home=${home ?? '?'} isHome=${isHome ? 'YES' : 'no'} ` +
    `builtMap=${JSON.stringify(bm ?? null)} ` +
    `tether=${t ? `${t.id}:L${t.level}` : 'NONE'} ` +
    `L1=${rowFor(gs, ss, 'tether-l1')} L2=${rowFor(gs, ss, 'tether-l2')} ` +
    `L3=${rowFor(gs, ss, 'tether-l3')} ` +
    `mining=${JSON.stringify(miningStatsOf(gs) ?? null)} ` +
    `jsSeed=${typeof gs?._seedStartingBuilds === 'function'} ` +
    `dataL1starting=${JSON.stringify(defById('tether-l1')?.starting ?? null)} ` +
    `errors=${_errors.length}`;
  console.info(line);
  return line;
}

/** Full report. Logs it, returns the string (copy-paste friendly). */
export function full() {
  const gs = sceneOf('GameScene');
  const ss = sceneOf('SurfaceScene');
  const home = homeNameOf(gs);
  const planet = ss?.planetName ?? home;
  const scenes = {};
  for (const k of ['MenuScene', 'GameScene', 'SurfaceScene']) {
    const s = sceneOf(k);
    scenes[k] = s ? (s.status ?? 'present') : 'absent';
  }
  const lines = [
    `ORBIT BUILD DIAG v${DIAG_V}`,
    `[env] url=${globalThis.location?.href ?? '?'} ua=${String(globalThis.navigator?.userAgent ?? '?').slice(0, 90)}`,
    `[js] GameScene=${gs ? 'present' : 'ABSENT'} seedFn=${typeof gs?._seedStartingBuilds === 'function'} ` +
      `beginBuild=${typeof gs?.beginBuild === 'function'} buildState=${!!gs?.buildState}`,
    `[data] ${JSON.stringify(dataFacts())}`,
    `[run] home=${home ?? 'n/a'} currentPlanet=${planet ?? 'n/a (not on surface)'} ` +
      `ssGameSceneIsGs=${ss ? String(!!gs && ss.gameScene === gs) : 'n/a'} ` +
      `pendingRestore=${JSON.stringify(pendingRestore())}`,
    `[state] builtMap=${JSON.stringify(builtMapOf(gs) ?? null)}`,
    `        homeTether=${JSON.stringify(tetherFor(gs, home) ?? null)} ` +
      `planetTether=${JSON.stringify(tetherFor(gs, planet) ?? null)}`,
    `        miningStats=${JSON.stringify(miningStatsOf(gs) ?? null)}`,
    `        researchTetherL2=${gs?.researchState?.isUnlocked?.('exploration', 'tether_l2') ?? 'n/a'} ` +
      `researchTetherL3=${gs?.researchState?.isUnlocked?.('exploration', 'tether_l3') ?? 'n/a'} ` +
      `researchMining=${JSON.stringify({
        improved_arm: gs?.researchState?.isUnlocked?.('mining', 'improved_arm') ?? 'n/a',
        advanced_arm: gs?.researchState?.isUnlocked?.('mining', 'advanced_arm') ?? 'n/a',
        improved_storage: gs?.researchState?.isUnlocked?.('mining', 'improved_storage') ?? 'n/a',
      })} ` +
      `activeBuild=${JSON.stringify(gs?.buildState?.getActive?.() ?? null)}`,
    `[rows]  L1=${rowFor(gs, ss, 'tether-l1')}`,
    `        L2=${rowFor(gs, ss, 'tether-l2')}`,
    `        L3=${rowFor(gs, ss, 'tether-l3')}`,
    `        ARM-I=${rowFor(gs, ss, 'mining-arm-improved')}`,
    `        ARM-A=${rowFor(gs, ss, 'mining-arm-advanced')}`,
    `        STORE=${rowFor(gs, ss, 'mining-storage-improved')}`,
    `[saves] ${JSON.stringify(saveBank())}`,
    `[scenes] ${JSON.stringify(scenes)}`,
    `[errors since boot] ${_errors.length ? _errors.join(' | ') : 'none'}`,
  ];
  const text = lines.join('\n');
  console.info(text);
  return text;
}

/** Install the console commands. Idempotent. */
export function installBuildDiag() {
  if (typeof globalThis === 'undefined') return;
  if (!globalThis.addEventListener) return;
  globalThis.addEventListener('error', (e) => _errCap(e.message));
  globalThis.addEventListener('unhandledrejection', (e) => _errCap(`rejection: ${e.reason}`));
  globalThis.orbitDiag = () => full();
  globalThis.orbitDiagBrief = () => brief();
  console.info(`[orbit-diag v${DIAG_V}] installed — type orbitDiag() in the console for a full report`);
}