#!/usr/bin/env node
// The Beacon — headless smoke test
//
// Loads game.js in a sandboxed vm context with a minimal DOM stub, then asserts
// invariants that should hold after booting, clicking, buying buildings, firing
// events, and round-tripping a save. Designed to run without any npm deps — pure
// Node built-ins only, so the CI runner doesn't need a package.json.
//
// Run: `node scripts/smoke.mjs` (exits non-zero on failure)

import fs from 'node:fs';
import vm from 'node:vm';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const GAME_JS = path.resolve(__dirname, '..', 'game.js');

// ---------- minimal DOM stub ----------
// The game never inspects elements beyond the methods below. If a new rendering
// path needs a new method, stub it here rather than pulling in jsdom.
function makeElement() {
    const el = {
        style: {},
        classList: { add: () => {}, remove: () => {}, contains: () => false, toggle: () => {} },
        textContent: '',
        innerHTML: '',
        title: '',
        value: '',
        disabled: false,
        children: [],
        firstChild: null,
        lastChild: null,
        parentNode: null,
        parentElement: null,
        appendChild(c) { this.children.push(c); c.parentNode = this; c.parentElement = this; return c; },
        removeChild(c) { this.children = this.children.filter(x => x !== c); return c; },
        insertBefore(c) { this.children.unshift(c); c.parentNode = this; c.parentElement = this; return c; },
        addEventListener: () => {},
        removeEventListener: () => {},
        querySelector: () => null,
        querySelectorAll: () => [],
        getBoundingClientRect: () => ({ top: 0, left: 0, right: 100, bottom: 20, width: 100, height: 20 }),
        closest() { return this; },
        remove() { if (this.parentNode) this.parentNode.removeChild(this); },
        get offsetHeight() { return 0; },
    };
    return el;
}

function makeDocument() {
    const body = makeElement();
    return {
        body,
        getElementById: () => makeElement(),
        createElement: () => makeElement(),
        querySelector: () => null,
        querySelectorAll: () => [],
        addEventListener: () => {},
    };
}

// ---------- sandbox ----------
const storage = new Map();
const sandbox = {
    document: makeDocument(),
    window: null,   // set below
    localStorage: {
        getItem: (k) => (storage.has(k) ? storage.get(k) : null),
        setItem: (k, v) => storage.set(k, String(v)),
        removeItem: (k) => storage.delete(k),
        clear: () => storage.clear(),
    },
    setTimeout: () => 0,
    clearTimeout: () => {},
    setInterval: () => 0,
    clearInterval: () => {},
    requestAnimationFrame: (cb) => { cb(0); return 0; },
    console,
    Math, Date, JSON, Object, Array, String, Number, Boolean, Error, Symbol, Map, Set,
    isNaN, isFinite, parseInt, parseFloat,
    Infinity, NaN,
    alert: () => {},
    confirm: () => true,
    prompt: () => null,
    location: { reload: () => {} },
    navigator: { clipboard: { writeText: async () => {} } },
    Blob: class Blob { constructor() {} },
    URL: { createObjectURL: () => '', revokeObjectURL: () => {} },
    FileReader: class FileReader {},
    addEventListener: () => {},
    removeEventListener: () => {},
};
sandbox.window = sandbox;  // game.js uses `window.addEventListener`
sandbox.globalThis = sandbox;

vm.createContext(sandbox);
const src = fs.readFileSync(GAME_JS, 'utf8');
// game.js uses `const G = {...}` which is a lexical declaration — it isn't
// visible as a sandbox property after runInContext. We append an explicit
// export block that hoists the interesting symbols onto globalThis so the
// test harness can reach them without patching game.js itself.
const exportTail = `
;(function () {
    const pick = (name) => {
        try { return eval(name); } catch (_) { return undefined; }
    };
    globalThis.__smokeExport = {
        G: pick('G'),
        CONFIG: pick('CONFIG'),
        BDEF: pick('BDEF'),
        PDEFS: pick('PDEFS'),
        EVENTS: pick('EVENTS'),
        PHASES: pick('PHASES'),
        tick: pick('tick'),
        updateRates: pick('updateRates'),
        writeCode: pick('writeCode'),
        autoType: pick('autoType'),
        buyBuilding: pick('buyBuilding'),
        buyProject: pick('buyProject'),
        saveGame: pick('saveGame'),
        loadGame: pick('loadGame'),
        initGame: pick('initGame'),
        triggerEvent: pick('triggerEvent'),
        resolveEvent: pick('resolveEvent'),
        getClickPower: pick('getClickPower'),
    };
})();`;
vm.runInContext(src + exportTail, sandbox, { filename: 'game.js' });
const exported = sandbox.__smokeExport;

// ---------- test harness ----------
let failures = 0;
let passes = 0;
function assert(cond, msg) {
    if (cond) {
        passes++;
        console.log(`  ok   ${msg}`);
    } else {
        failures++;
        console.error(`  FAIL ${msg}`);
    }
}
function section(name) { console.log(`\n${name}`); }

const { G, CONFIG, BDEF, PDEFS, EVENTS } = exported;

// ============================================================
// 1. BOOT — loading game.js must not throw, and core tables exist
// ============================================================
section('boot');
assert(typeof G === 'object' && G !== null, 'G global is defined');
assert(typeof exported.tick === 'function', 'tick() is defined');
assert(typeof exported.updateRates === 'function', 'updateRates() is defined');
assert(typeof exported.writeCode === 'function', 'writeCode() is defined');
assert(typeof exported.buyBuilding === 'function', 'buyBuilding() is defined');
assert(typeof exported.saveGame === 'function', 'saveGame() is defined');
assert(typeof exported.loadGame === 'function', 'loadGame() is defined');
assert(Array.isArray(BDEF) && BDEF.length > 0, 'BDEF is a non-empty array');
assert(Array.isArray(PDEFS) && PDEFS.length > 0, 'PDEFS is a non-empty array');
assert(Array.isArray(EVENTS) && EVENTS.length > 0, 'EVENTS is a non-empty array');
assert(G.flags && typeof G.flags === 'object', 'G.flags is initialized (not undefined)');

// Initialize as the browser would
G.startedAt = Date.now();
exported.updateRates();

// ============================================================
// 2. BASIC TICK — no NaN, no throw, rates sane
// ============================================================
section('basic tick loop');
for (let i = 0; i < 50; i++) exported.tick();
assert(!isNaN(G.code), 'G.code is not NaN after 50 ticks');
assert(!isNaN(G.compute), 'G.compute is not NaN after 50 ticks');
assert(G.code >= 0, 'G.code is non-negative');
assert(G.tick > 0, 'G.tick advanced');

// ============================================================
// 3. WRITE CODE — manual click produces code
// ============================================================
section('writeCode()');
const codeBefore = G.code;
exported.writeCode();
assert(G.code > codeBefore, 'writeCode() increases G.code');
assert(G.totalClicks === 1, 'writeCode() increments totalClicks');

// ============================================================
// 4. BUILDING PURCHASE — can afford and buy an autocoder
// ============================================================
section('buyBuilding(autocoder)');
G.code = 1000;
const priorCount = G.buildings.autocoder || 0;
exported.buyBuilding('autocoder');
assert(G.buildings.autocoder === priorCount + 1, 'autocoder count incremented');
assert(G.code < 1000, 'code was spent');
exported.updateRates();
assert(G.codeRate > 0, 'codeRate > 0 after buying an autocoder');

// ============================================================
// 5. GUARDRAIL — codeBoost is a PERSISTENT multiplier, not a per-tick rate
// Any debuff that does `G.codeBoost *= 0.7` inside a function that runs every
// tick will decay codeBoost exponentially. This caught #54's community_drama
// bug: its applyFn mutated codeBoost directly, so 100 ticks of the drama
// debuff left codeBoost at ~3e-16 instead of the intended 0.7.
// ============================================================
section('guardrail: codeBoost does not decay from any debuff');
G.code = 0;
G.codeBoost = 1;
G.activeDebuffs = [];
// Fire every event that sets up a debuff and has a non-zero weight predicate
// if we force the gating condition. We enable the predicates by temporarily
// setting the fields they check; actual event weight() doesn't matter here.
G.ciFlag = 1;
G.deployFlag = 1;
G.buildings.ezra = 1;
G.buildings.bilbo = 1;
G.buildings.allegro = 1;
G.buildings.datacenter = 1;
G.buildings.community = 1;
G.harmony = 40;
G.totalCompute = 5000;
G.totalImpact = 20000;
for (const ev of EVENTS) {
    try { ev.effect(); } catch (_) { /* alignment events may branch; ignore */ }
}
const boostAfterAllEvents = G.codeBoost;
for (let i = 0; i < 200; i++) exported.updateRates();
assert(
    Math.abs(G.codeBoost - boostAfterAllEvents) < 1e-9,
    `codeBoost stable under updateRates() (before=${boostAfterAllEvents}, after=${G.codeBoost})`
);
// Clean up
G.activeDebuffs = [];
G.buildings.ezra = 0; G.buildings.bilbo = 0; G.buildings.allegro = 0;
G.buildings.datacenter = 0; G.buildings.community = 0;
G.ciFlag = 0; G.deployFlag = 0;

// ============================================================
// 6. GUARDRAIL — updateRates() is idempotent per tick
// Calling updateRates twice with the same inputs should produce the same rates.
// (Catches accidental += against a non-reset field.)
// ============================================================
section('guardrail: updateRates is idempotent');
G.buildings.autocoder = 5;
G.codeBoost = 1;
exported.updateRates();
const firstCodeRate = G.codeRate;
const firstComputeRate = G.computeRate;
exported.updateRates();
assert(G.codeRate === firstCodeRate, `codeRate stable across updateRates (${firstCodeRate} vs ${G.codeRate})`);
assert(G.computeRate === firstComputeRate, 'computeRate stable across updateRates');

// ============================================================
// 7. SAVE / LOAD ROUND-TRIP — core scalar fields survive
// ============================================================
section('save/load round-trip');
G.code = 12345;
G.totalCode = 98765;
G.phase = 3;
G.buildings.autocoder = 7;
G.codeBoost = 1.5;
G.flags = { creativity: true };
exported.saveGame();
// Reset to defaults by scrubbing a few fields
G.code = 0;
G.totalCode = 0;
G.phase = 1;
G.buildings.autocoder = 0;
G.codeBoost = 1;
G.flags = {};
const ok = exported.loadGame();
assert(ok, 'loadGame() returned truthy');
assert(G.code === 12345, `G.code restored (got ${G.code})`);
assert(G.totalCode === 98765, `G.totalCode restored (got ${G.totalCode})`);
assert(G.phase === 3, `G.phase restored (got ${G.phase})`);
assert(G.buildings.autocoder === 7, `autocoder count restored (got ${G.buildings.autocoder})`);
assert(Math.abs(G.codeBoost - 1.5) < 1e-9, `codeBoost restored (got ${G.codeBoost})`);
assert(G.flags && G.flags.creativity === true, 'flags.creativity restored');

// ============================================================
// 8. SUMMARY
// ============================================================
console.log(`\n---\n${passes} passed, ${failures} failed`);
if (failures > 0) {
    process.exitCode = 1;
}