/**
 * RobloxShim v3 (для main-thread sandbox) — Roblox API + DataModel.
 *
 * Этап 3: добавлено виртуальное дерево DataModel поверх плоской сцены.
 *   - game.Workspace.Children = массив RbxPart обёрток над примитивами
 *   - script.Parent для target-скриптов = реальный RbxPart
 *   - RbxPart.Touched — RbxSignal который фейерится из BabylonScene при overlap
 *   - RbxPart.Position/Size/Color/Anchored/CanCollide — пишутся через setProp(part, ...)
 *     методы, которые шлют partSet в main thread (применяется к Babylon-сцене)
 *   - Humanoid с Health setter → playerSet команда
 *
 * ВАЖНО про wasmoon: не используем Object.defineProperty getters на JS-объектах
 * передаваемых в Lua — wasmoon их некорректно оборачивает (js_promise). Вместо
 * этого — обычные поля, которые юзер читает напрямую. Запись свойств происходит
 * через `__rbxl_part_set(part, prop, value)` — она шлёт partSet и обновляет поле.
 */

// ---------- Scheduler (для task.delay/defer) ----------
const SCHEDULER = {
    sleeping: [],   // [{wakeAt, run}]
    now: () => performance.now(),
};

// ---------- Базовые сигналы ----------
const HEARTBEAT_SIGNAL = makeSignal();
const STEPPED_SIGNAL = makeSignal();

function makeSignal() {
    const sig = {
        __isSignal: true,
        connections: [],
    };
    sig.Connect = function (fn) {
        if (typeof fn !== 'function') return { Disconnect() {}, disconnect() {}, Connected: false };
        sig.connections.push(fn);
        const conn = { Connected: true };
        conn.Disconnect = function () {
            const i = sig.connections.indexOf(fn);
            if (i >= 0) sig.connections.splice(i, 1);
            conn.Connected = false;
        };
        conn.disconnect = conn.Disconnect;
        return conn;
    };
    sig.connect = sig.Connect;
    sig.Fire = function (...args) {
        for (const fn of [...sig.connections]) {
            try { fn(...args); } catch (e) {
                // eslint-disable-next-line no-console
                console.error('[Signal handler]', e);
            }
        }
    };
    sig.fire = sig.Fire;
    sig.Wait = () => null;
    sig.wait = sig.Wait;
    return sig;
}

// ---------- Vector3 / Color3 / UDim2 / Vector2 / CFrame ----------
class RbxVector3 {
    constructor(x = 0, y = 0, z = 0) { this.X = +x; this.Y = +y; this.Z = +z; }
    static new(x, y, z) { return new RbxVector3(x, y, z); }
    get Magnitude() { return Math.hypot(this.X, this.Y, this.Z); }
    get magnitude() { return Math.hypot(this.X, this.Y, this.Z); }
    get Unit() {
        const m = Math.hypot(this.X, this.Y, this.Z) || 1;
        return new RbxVector3(this.X / m, this.Y / m, this.Z / m);
    }
    get unit() { return this.Unit; }
    Normalize() { return this.Unit; }
    Dot(b) { return this.X * b.X + this.Y * b.Y + this.Z * b.Z; }
    Cross(b) {
        return new RbxVector3(
            this.Y * b.Z - this.Z * b.Y,
            this.Z * b.X - this.X * b.Z,
            this.X * b.Y - this.Y * b.X,
        );
    }
    Lerp(b, t) {
        return new RbxVector3(
            this.X + (b.X - this.X) * t,
            this.Y + (b.Y - this.Y) * t,
            this.Z + (b.Z - this.Z) * t,
        );
    }
}
RbxVector3.zero = new RbxVector3(0, 0, 0);
RbxVector3.one = new RbxVector3(1, 1, 1);
RbxVector3.xAxis = new RbxVector3(1, 0, 0);
RbxVector3.yAxis = new RbxVector3(0, 1, 0);
RbxVector3.zAxis = new RbxVector3(0, 0, 1);

class RbxColor3 {
    constructor(r = 0, g = 0, b = 0) { this.R = +r; this.G = +g; this.B = +b; }
    static new(r, g, b) { return new RbxColor3(r, g, b); }
    static fromRGB(r, g, b) { return new RbxColor3((r || 0) / 255, (g || 0) / 255, (b || 0) / 255); }
    static fromHSV(h, s, v) {
        const i = Math.floor(h * 6); const f = h * 6 - i;
        const p = v * (1 - s); const q = v * (1 - f * s); const t = v * (1 - (1 - f) * s);
        const [r, g, b] = [[v, t, p], [q, v, p], [p, v, t], [p, q, v], [t, p, v], [v, p, q]][i % 6];
        return new RbxColor3(r, g, b);
    }
    static fromHex(hex) {
        const s = String(hex || '').replace('#', '');
        if (s.length !== 6) return new RbxColor3();
        return new RbxColor3(
            parseInt(s.slice(0, 2), 16) / 255,
            parseInt(s.slice(2, 4), 16) / 255,
            parseInt(s.slice(4, 6), 16) / 255,
        );
    }
    Lerp(b, t) {
        return new RbxColor3(
            this.R + (b.R - this.R) * t,
            this.G + (b.G - this.G) * t,
            this.B + (b.B - this.B) * t,
        );
    }
    toHex() {
        const h = (n) => Math.round(Math.max(0, Math.min(1, n)) * 255).toString(16).padStart(2, '0');
        return '#' + h(this.R) + h(this.G) + h(this.B);
    }
}

class RbxUDim {
    constructor(s = 0, o = 0) { this.Scale = +s; this.Offset = +o; }
    static new(s, o) { return new RbxUDim(s, o); }
}
class RbxUDim2 {
    constructor(sx = 0, ox = 0, sy = 0, oy = 0) {
        this.X = new RbxUDim(sx, ox); this.Y = new RbxUDim(sy, oy);
    }
    static new(sx, ox, sy, oy) { return new RbxUDim2(sx, ox, sy, oy); }
    static fromScale(sx, sy) { return new RbxUDim2(sx, 0, sy, 0); }
    static fromOffset(ox, oy) { return new RbxUDim2(0, ox, 0, oy); }
}
class RbxVector2 {
    constructor(x = 0, y = 0) { this.X = +x; this.Y = +y; }
    static new(x, y) { return new RbxVector2(x, y); }
}
class RbxCFrame {
    constructor(x = 0, y = 0, z = 0) {
        this.X = +x; this.Y = +y; this.Z = +z;
        this.Position = new RbxVector3(x, y, z);
        this.p = this.Position;
    }
    static new(x, y, z) { return new RbxCFrame(x || 0, y || 0, z || 0); }
    static lookAt(eye, _t) { return new RbxCFrame(eye?.X || 0, eye?.Y || 0, eye?.Z || 0); }
    static Angles() { return new RbxCFrame(); }
    static fromEulerAnglesXYZ() { return new RbxCFrame(); }
}

// ---------- Instance / Part ----------
let _instanceMethods = null;
function makeInstanceMethods() {
    if (_instanceMethods) return _instanceMethods;
    _instanceMethods = {
        GetChildren: function () { return [...(this.Children || [])]; },
        GetDescendants: function () {
            const out = [];
            const visit = (n) => {
                for (const c of n.Children || []) { out.push(c); visit(c); }
            };
            visit(this);
            return out;
        },
        FindFirstChild: function (name, recursive) {
            for (const c of this.Children || []) {
                if (c.Name === name) return c;
                if (recursive) {
                    const f = c.FindFirstChild && c.FindFirstChild(name, true);
                    if (f) return f;
                }
            }
            return undefined;
        },
        FindFirstChildOfClass: function (cls) {
            for (const c of this.Children || []) {
                if (c.ClassName === cls) return c;
            }
            return undefined;
        },
        FindFirstAncestor: function (name) {
            let p = this.Parent;
            while (p) { if (p.Name === name) return p; p = p.Parent; }
            return undefined;
        },
        FindFirstAncestorOfClass: function (cls) {
            let p = this.Parent;
            while (p) { if (p.ClassName === cls) return p; p = p.Parent; }
            return undefined;
        },
        WaitForChild: function (name) { return this.FindFirstChild(name); },
        IsA: function (cls) { return this.ClassName === cls || cls === 'Instance'; },
        GetFullName: function () {
            const parts = [];
            let p = this;
            while (p && p.ClassName !== 'DataModel') {
                parts.unshift(p.Name);
                p = p.Parent;
            }
            return parts.join('.');
        },
        Destroy: function () {
            this.Destroyed = true;
            // Если это Part с примитивом — шлём sceneDelete
            if (this.__primId != null && this.__sendDestroy) {
                try { this.__sendDestroy(this.__primId); } catch (_) {}
            }
            if (this.Parent && this.Parent.Children) {
                const i = this.Parent.Children.indexOf(this);
                if (i >= 0) this.Parent.Children.splice(i, 1);
                this.Parent = undefined;
            }
        },
        Clone: function () { return undefined; },
        GetAttribute: function (n) { return (this.Attributes || {})[n]; },
        SetAttribute: function (n, v) {
            if (!this.Attributes) this.Attributes = {};
            this.Attributes[n] = v;
        },
        GetPropertyChangedSignal: function () { return this.Changed; },
    };
    return _instanceMethods;
}

function newInstance(className, name) {
    const m = makeInstanceMethods();
    return {
        ClassName: className || 'Instance',
        Name: name || className || 'Instance',
        Parent: undefined,
        Children: [],
        Destroyed: false,
        Attributes: {},
        ChildAdded: makeSignal(),
        ChildRemoved: makeSignal(),
        AncestryChanged: makeSignal(),
        Changed: makeSignal(),
        GetChildren: m.GetChildren,
        GetDescendants: m.GetDescendants,
        FindFirstChild: m.FindFirstChild,
        FindFirstChildOfClass: m.FindFirstChildOfClass,
        FindFirstAncestor: m.FindFirstAncestor,
        FindFirstAncestorOfClass: m.FindFirstAncestorOfClass,
        WaitForChild: m.WaitForChild,
        IsA: m.IsA,
        GetFullName: m.GetFullName,
        Destroy: m.Destroy,
        Clone: m.Clone,
        GetAttribute: m.GetAttribute,
        SetAttribute: m.SetAttribute,
        GetPropertyChangedSignal: m.GetPropertyChangedSignal,
    };
}

/**
 * Создать RbxPart-обёртку. Возвращает plain объект (без getter'ов) —
 * запись свойств идёт через метод __SetProp, которое мы экспортируем
 * глобально как `__rbxl_part_set(part, prop, value)`.
 */
function newPart(primData, sendFn) {
    const p = newInstance('Part', primData.name || `Part_${primData.id}`);
    p.__primId = primData.id;
    p.__sendDestroy = (id) => sendFn('sceneDelete', { primId: id });
    p.Touched = makeSignal();
    p.TouchEnded = makeSignal();
    p.Material = 'Plastic';

    // Внутренний state: реальные значения хранятся здесь, в Lua через getter/setter.
    p._state = {
        Position: new RbxVector3(primData.x || 0, primData.y || 0, primData.z || 0),
        Size: new RbxVector3(primData.sx || 1, primData.sy || 1, primData.sz || 1),
        Color: primData.color ? RbxColor3.fromHex(primData.color) : new RbxColor3(0.5, 0.5, 0.5),
        Anchored: !!primData.anchored,
        CanCollide: primData.canCollide !== false,
        Transparency: primData.opacity != null ? (1 - primData.opacity) : 0,
    };

    // Setter'ы шлют partSet → BabylonScene.primitiveManager через handleLuaCommand.
    // Формат payload должен соответствовать rbxl-lua-integration.js#handleLuaCommand.
    const send = (prop, value) => {
        try { sendFn('partSet', { primId: p.__primId, prop, value }); } catch (_) {}
    };
    Object.defineProperty(p, 'Position', {
        get() { return p._state.Position; },
        set(v) {
            if (!v) return;
            const nv = new RbxVector3(v.X || 0, v.Y || 0, v.Z || 0);
            p._state.Position = nv;
            send('position', { x: nv.X, y: nv.Y, z: nv.Z });
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'Size', {
        get() { return p._state.Size; },
        set(v) {
            if (!v) return;
            const nv = new RbxVector3(v.X || 1, v.Y || 1, v.Z || 1);
            p._state.Size = nv;
            send('size', { sx: nv.X, sy: nv.Y, sz: nv.Z });
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'Color', {
        get() { return p._state.Color; },
        set(v) {
            if (!v) return;
            const nv = v instanceof RbxColor3 ? v : new RbxColor3(v.R || 0, v.G || 0, v.B || 0);
            p._state.Color = nv;
            // handleLuaCommand ожидает строку для color
            send('color', nv.toHex());
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'BrickColor', {
        get() { return { Color: p._state.Color, Name: 'Custom' }; },
        set(v) { if (v && v.Color) p.Color = v.Color; },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'Anchored', {
        get() { return p._state.Anchored; },
        set(v) {
            p._state.Anchored = !!v;
            send('anchored', !!v);
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'CanCollide', {
        get() { return p._state.CanCollide; },
        set(v) {
            p._state.CanCollide = !!v;
            send('canCollide', !!v);
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'Transparency', {
        get() { return p._state.Transparency; },
        set(v) {
            const nv = Math.max(0, Math.min(1, Number(v) || 0));
            p._state.Transparency = nv;
            // handleLuaCommand ожидает number для opacity
            send('opacity', 1 - nv);
        },
        enumerable: true, configurable: true,
    });
    Object.defineProperty(p, 'CFrame', {
        get() {
            const pos = p._state.Position;
            return new RbxCFrame(pos.X, pos.Y, pos.Z);
        },
        set(v) {
            if (v && v.Position) p.Position = v.Position;
            else if (v && v.X != null) p.Position = new RbxVector3(v.X, v.Y, v.Z);
        },
        enumerable: true, configurable: true,
    });
    return p;
}

// ---------- Регистрация в Lua ----------
export function registerRobloxShim(lua, opts) {
    const { send } = opts;
    const global = lua.global;

    // === Базовые типы ===
    global.set('Vector3', {
        new: (x, y, z) => new RbxVector3(x, y, z),
        zero: RbxVector3.zero, one: RbxVector3.one,
        xAxis: RbxVector3.xAxis, yAxis: RbxVector3.yAxis, zAxis: RbxVector3.zAxis,
        FromNormalId: () => new RbxVector3(),
    });
    global.set('Color3', {
        new: (r, g, b) => new RbxColor3(r, g, b),
        fromRGB: (r, g, b) => RbxColor3.fromRGB(r, g, b),
        fromHSV: (h, s, v) => RbxColor3.fromHSV(h, s, v),
        fromHex: (hex) => RbxColor3.fromHex(hex),
    });
    global.set('UDim', { new: (s, o) => new RbxUDim(s, o) });
    global.set('UDim2', {
        new: (sx, ox, sy, oy) => new RbxUDim2(sx, ox, sy, oy),
        fromScale: (sx, sy) => RbxUDim2.fromScale(sx, sy),
        fromOffset: (ox, oy) => RbxUDim2.fromOffset(ox, oy),
    });
    global.set('Vector2', { new: (x, y) => new RbxVector2(x, y) });
    global.set('CFrame', {
        new: (x, y, z) => RbxCFrame.new(x, y, z),
        lookAt: (e, t) => RbxCFrame.lookAt(e, t),
        Angles: RbxCFrame.Angles,
        fromEulerAnglesXYZ: RbxCFrame.fromEulerAnglesXYZ,
    });

    // === Enum ===
    const mkE = (arr) => Object.fromEntries(arr.map(k => [k, { Name: k, Value: k }]));
    global.set('Enum', {
        KeyCode: mkE(['W','A','S','D','Space','LeftShift','LeftControl','F','E','Q','R','T','Y','U','I','O','P','G','H','J','K','L','Z','X','C','V','B','N','M','Tab','Return','Escape','Backspace','Up','Down','Left','Right','One','Two','Three','Four','Five','Six','Seven','Eight','Nine','Zero']),
        UserInputType: mkE(['MouseButton1','MouseButton2','MouseButton3','MouseMovement','MouseWheel','Touch','Keyboard']),
        Material: mkE(['Plastic','Wood','Metal','Neon','Glass','Sand','Ice','Grass','Concrete']),
        HumanoidStateType: mkE(['Running','Jumping','Freefall','Landed','Dead','Climbing','Swimming','Seated']),
        EasingStyle: mkE(['Linear','Sine','Quad','Cubic','Quart','Quint','Bounce','Elastic']),
        EasingDirection: mkE(['In','Out','InOut']),
    });

    // === print / warn ===
    const stringify = (v) => {
        if (v == null) return 'nil';
        if (typeof v === 'string') return v;
        if (typeof v === 'number') return String(v);
        if (typeof v === 'boolean') return v ? 'true' : 'false';
        if (v instanceof RbxVector3) return `${v.X}, ${v.Y}, ${v.Z}`;
        if (v instanceof RbxColor3) return `${v.R}, ${v.G}, ${v.B}`;
        if (typeof v === 'object') {
            if (v.Name) return String(v.Name);
            return '[object]';
        }
        try { return String(v); } catch (_) { return '?'; }
    };
    global.set('print', (...args) => {
        send('log', { level: 'info', text: args.map(stringify).join('\t') });
    });
    global.set('warn', (...args) => {
        send('log', { level: 'warn', text: args.map(stringify).join('\t') });
    });

    // === task.* + wait ===
    // task.wait/wait — реальный yield через coroutines. Юзер пишет:
    //   while true do part.Position = ... ; task.wait(0.1) end
    // Это работает потому что **скрипт сам запускается как coroutine**
    // (см. LuaSharedSandbox._startSingleScript → мы оборачиваем код в pcall,
    // НО для yield нам нужно завернуть в coroutine.create). Делаем это
    // через Lua-prelude: глобальная функция `_run_in_coroutine(fn)`.
    global.set('task', {
        spawn: (fn) => {
            try { if (typeof fn === 'function') fn(); } catch (e) {
                send('log', { level: 'error', text: `[task.spawn] ${e?.message || e}` });
            }
        },
        delay: (sec, fn) => {
            if (typeof fn !== 'function') return;
            SCHEDULER.sleeping.push({
                wakeAt: SCHEDULER.now() + (Number(sec) || 0) * 1000,
                run: () => { try { fn(); } catch (e) {
                    send('log', { level: 'error', text: `[task.delay] ${e?.message || e}` });
                } },
            });
        },
        defer: (fn) => {
            if (typeof fn !== 'function') return;
            SCHEDULER.sleeping.push({
                wakeAt: SCHEDULER.now(),
                run: () => { try { fn(); } catch (_) {} },
            });
        },
        synchronize: () => {},
        desynchronize: () => {},
    });
    // task.wait и wait определяются через Lua coroutine.yield в prelude (см. ниже)

    // === DataModel ===
    const game = newInstance('DataModel', 'game');
    const workspace = newInstance('Workspace', 'Workspace');
    workspace.Parent = game;
    workspace.Gravity = 196.2;
    workspace.CurrentCamera = newInstance('Camera', 'Camera');
    workspace.CurrentCamera.Parent = workspace;
    workspace.Children.push(workspace.CurrentCamera);
    workspace.Terrain = newInstance('Terrain', 'Terrain');
    workspace.Terrain.Parent = workspace;
    workspace.Children.push(workspace.Terrain);
    game.Children.push(workspace);
    game.Workspace = workspace;

    const players = newInstance('Players', 'Players');
    players.Parent = game;
    players.PlayerAdded = makeSignal();
    players.PlayerRemoving = makeSignal();
    game.Children.push(players);
    game.Players = players;

    const localPlayer = newInstance('Player', 'Player');
    localPlayer.Parent = players;
    localPlayer.UserId = 1;
    localPlayer.DisplayName = 'Player';
    players.Children.push(localPlayer);
    players.LocalPlayer = localPlayer;

    const character = newInstance('Model', 'Player');
    character.Parent = localPlayer;
    localPlayer.Children.push(character);
    localPlayer.Character = character;

    const humanoid = newInstance('Humanoid', 'Humanoid');
    humanoid.Parent = character;
    humanoid.Health = 100;
    humanoid.MaxHealth = 100;
    humanoid.WalkSpeed = 16;
    humanoid.JumpPower = 50;
    humanoid.Died = makeSignal();
    humanoid.HealthChanged = makeSignal();
    humanoid.Touched = makeSignal();
    humanoid.StateChanged = makeSignal();
    humanoid.TakeDamage = function (n) {
        const v = Math.max(0, (this.Health || 100) - (Number(n) || 0));
        this.Health = v;
        this.HealthChanged.Fire(v);
        if (v === 0) this.Died.Fire();
        send('playerSet', { prop: 'health', value: v });
    };
    humanoid.MoveTo = function () {};
    humanoid.LoadAnimation = function () { return { Play: () => {}, Stop: () => {}, AdjustSpeed: () => {} }; };
    character.Children.push(humanoid);
    character.Humanoid = humanoid;

    const hrp = newInstance('Part', 'HumanoidRootPart');
    hrp.Parent = character;
    hrp.Position = new RbxVector3(0, 5, 0);
    hrp.Size = new RbxVector3(2, 2, 1);
    character.Children.push(hrp);
    character.HumanoidRootPart = hrp;
    character.PrimaryPart = hrp;

    // === Сервисы ===
    const services = {};
    const makeService = (name) => {
        if (services[name]) return services[name];
        const s = newInstance(name, name);
        s.Parent = game;
        game.Children.push(s);
        services[name] = s;
        game[name] = s;
        return s;
    };
    makeService('ReplicatedStorage');
    makeService('ServerStorage');
    makeService('StarterGui');
    makeService('StarterPack');
    makeService('StarterPlayer');

    const uis = makeService('UserInputService');
    uis.InputBegan = makeSignal();
    uis.InputChanged = makeSignal();
    uis.InputEnded = makeSignal();

    // TweenService — реальная интерполяция через Heartbeat
    const tw = makeService('TweenService');
    const activeTweens = []; // [{inst, props, duration, startAt, startVals, onDone}]
    tw.Create = function (inst, info, propGoals) {
        // info: TweenInfo (duration, EasingStyle, ...) — упрощённо берём только duration
        const duration = (info && (info.Time || info.duration)) || 1;
        const tween = {
            __completed: makeSignal(),
            Completed: undefined,
            Play() {
                if (!inst || !propGoals) return;
                const startVals = {};
                for (const k of Object.keys(propGoals)) {
                    try { startVals[k] = inst[k]; } catch (_) {}
                }
                activeTweens.push({
                    inst, props: propGoals, duration,
                    startAt: performance.now(),
                    startVals,
                    onDone: () => tween.__completed.Fire(),
                });
            },
            Pause() {},
            Cancel() {},
        };
        tween.Completed = tween.__completed;
        return tween;
    };
    function _stepTweens(_dt) {
        if (activeTweens.length === 0) return;
        const now = performance.now();
        for (let i = activeTweens.length - 1; i >= 0; i--) {
            const t = activeTweens[i];
            const elapsed = (now - t.startAt) / 1000;
            const k = Math.min(1, elapsed / t.duration);
            for (const prop of Object.keys(t.props)) {
                const goal = t.props[prop];
                const start = t.startVals[prop];
                if (!start || !goal) continue;
                if (start instanceof RbxVector3 && goal instanceof RbxVector3) {
                    try { t.inst[prop] = start.Lerp(goal, k); } catch (_) {}
                } else if (start instanceof RbxColor3 && goal instanceof RbxColor3) {
                    try { t.inst[prop] = start.Lerp(goal, k); } catch (_) {}
                } else if (typeof start === 'number' && typeof goal === 'number') {
                    try { t.inst[prop] = start + (goal - start) * k; } catch (_) {}
                }
            }
            if (k >= 1) {
                activeTweens.splice(i, 1);
                try { t.onDone(); } catch (_) {}
            }
        }
    }

    const http = makeService('HttpService');
    http.JSONEncode = function (v) { try { return JSON.stringify(v); } catch (_) { return '{}'; } };
    http.JSONDecode = function (s) { try { return JSON.parse(s); } catch (_) { return undefined; } };
    http.GenerateGUID = () => 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
        const r = Math.random() * 16 | 0; return (c === 'x' ? r : (r & 3 | 8)).toString(16);
    });

    makeService('Lighting').Ambient = new RbxColor3(0.5, 0.5, 0.5);
    makeService('Chat');
    makeService('SoundService');
    makeService('PathfindingService');
    makeService('CollectionService');
    makeService('MarketplaceService');

    const ds = makeService('DataStoreService');
    ds.GetDataStore = function () {
        return {
            GetAsync: () => undefined, SetAsync: () => {}, UpdateAsync: () => {},
            RemoveAsync: () => {}, IncrementAsync: () => {},
        };
    };

    const ctx = makeService('ContextActionService');
    ctx.BindAction = () => {};
    ctx.UnbindAction = () => {};

    const runService = makeService('RunService');
    runService.Heartbeat = HEARTBEAT_SIGNAL;
    runService.Stepped = STEPPED_SIGNAL;
    runService.RenderStepped = HEARTBEAT_SIGNAL;
    runService.IsClient = () => true;
    runService.IsServer = () => true;
    runService.IsRunning = () => true;
    runService.IsStudio = () => false;

    game.GetService = function (name) {
        if (name === 'Workspace') return workspace;
        if (name === 'Players') return players;
        return services[name] || makeService(name);
    };
    game.FindService = function (name) { return services[name] || null; };

    global.set('game', game);
    global.set('Game', game);
    global.set('workspace', workspace);
    global.set('Workspace', workspace);

    // === Instance.new ===
    // Счётчик для новых Part'ов, создаваемых через Instance.new("Part"):
    // primitiveManager.addInstance даст уникальный id, мы используем временный
    // отрицательный id пока не пришёл sceneCreate ACK. Но проще: даём свой
    // негативный id, primitiveManager заменит на свой. Для простоты — даём
    // высокий positive id (10000+ random) и primitiveManager его использует
    // если не занят.
    let _nextNewPartId = 100000 + Math.floor(Math.random() * 10000);

    global.set('Instance', {
        new: (className, parent) => {
            let inst;
            if (className === 'Part' || className === 'WedgePart' || className === 'MeshPart') {
                // Реальный примитив на сцене: шлём sceneCreate, регистрируем в partById
                const newId = _nextNewPartId++;
                const fakePrim = {
                    id: newId,
                    name: `Part_${newId}`,
                    x: 0, y: 0, z: 0,
                    sx: 4, sy: 1, sz: 2,
                    color: '#A0A0A0',
                    anchored: true,
                    canCollide: true,
                };
                send('sceneCreate', {
                    primId: newId,
                    type: className === 'WedgePart' ? 'wedge' : 'cube',
                    x: 0, y: 0, z: 0,
                    sx: 4, sy: 1, sz: 2,
                    color: '#A0A0A0',
                    anchored: true,
                    canCollide: true,
                });
                inst = newPart(fakePrim, send);
                partById.set(newId, inst);
            } else if (className === 'RemoteEvent') {
                inst = newInstance('RemoteEvent', 'RemoteEvent');
                inst.OnServerEvent = makeSignal();
                inst.OnClientEvent = makeSignal();
                inst.FireServer = function (...a) { this.OnServerEvent.Fire(localPlayer, ...a); };
                inst.FireClient = function (_p, ...a) { this.OnClientEvent.Fire(...a); };
                inst.FireAllClients = function (...a) { this.OnClientEvent.Fire(...a); };
            } else if (className === 'BindableEvent') {
                inst = newInstance('BindableEvent', 'BindableEvent');
                inst.Event = makeSignal();
                inst.Fire = function (...a) { this.Event.Fire(...a); };
            } else if (className === 'Humanoid') {
                inst = newInstance('Humanoid', 'Humanoid');
                inst.Health = 100; inst.MaxHealth = 100;
                inst.Died = makeSignal(); inst.HealthChanged = makeSignal();
                inst.TakeDamage = function (n) { this.Health = Math.max(0, this.Health - (n || 0)); };
            } else {
                inst = newInstance(className, className);
            }
            if (parent) {
                inst.Parent = parent;
                if (parent.Children) {
                    parent.Children.push(inst);
                    if (parent.ChildAdded) parent.ChildAdded.Fire(inst);
                }
            }
            return inst;
        },
    });

    // === Helpers для скриптов ===
    const partById = new Map();
    global.set('__rbxl_get_part_by_id', (id) => partById.get(Number(id)) || undefined);
    global.set('__rbxl_send_error', (id, errStr) => {
        send('log', { level: 'error', text: `[Lua ${id}] ${errStr || 'unknown error'}` });
    });

    // === Coroutines registry + task.wait через yield ===
    // Каждый скрипт стартует как coroutine. Когда юзер пишет task.wait(sec),
    // мы делаем coroutine.yield(sec). Main-loop резюмирует когда время вышло.
    const coroutines = new Map(); // id → coroutine
    const waitingCoros = []; // [{coId, wakeAt}]
    global.set('__rbxl_register_coroutine', (id, co) => {
        coroutines.set(String(id), co);
    });
    global.set('__rbxl_unregister_coroutine', (id) => {
        coroutines.delete(String(id));
    });
    global.set('__rbxl_get_co', (id) => coroutines.get(String(id)) || undefined);
    global.set('__rbxl_schedule_resume', (coId, delaySec) => {
        waitingCoros.push({
            coId: String(coId),
            wakeAt: SCHEDULER.now() + (Number(delaySec) || 0) * 1000,
        });
    });

    // Lua-prelude: task.wait через coroutine.yield + готовая resume-функция.
    // Главное: __rbxl_resume_co определена в Lua и вызывается из JS через
    // lua.global.get('__rbxl_resume_co') — это безопаснее чем doStringSync
    // потому что не парсит код заново и не создаёт re-entrant проблем.
    // Lua-side helper для логов (используется в task.wait/resume для отладки)
    global.set('__log', (level, text) => {
        send('log', { level: String(level || 'info'), text: String(text || '') });
    });

    lua.doStringSync(`
        local function rbx_wait(sec)
            sec = sec or 0
            local ret = coroutine.yield(sec)
            return ret or sec
        end
        if type(task) == 'table' then
            task.wait = rbx_wait
        else
            task = { wait = rbx_wait }
        end
        wait = rbx_wait

        function __rbxl_resume_co(co)
            if not co or coroutine.status(co) ~= 'suspended' then return nil end
            local ok, ret = coroutine.resume(co)
            if not ok then return false, tostring(ret) end
            if coroutine.status(co) == 'dead' then return nil end
            if type(ret) == 'number' then return ret end
            return 0
        end
    `);
    // Добавим Lua-side helper для лога
    global.set('__log', (level, text) => {
        send('log', { level: String(level || 'info'), text: String(text || '') });
    });
    // Достаём ссылку на Lua-функцию один раз; вызовы безопасны (не doStringSync)
    const luaResumeCo = lua.global.get('__rbxl_resume_co');

    // === Setter Part-свойств (Position/Size/Color/...) ===
    // Юзер пишет: part.Position = Vector3.new(0, 10, 0)
    // В Lua-side это просто rawset. Но мы хотим, чтобы JS-сторона узнала и применила.
    // Решение: каждые N секунд (или по требованию) — сканируем partById и сравниваем
    // _state. Это дорого. ПРОСТЕЕ: научим юзера использовать part:SetPosition(v).
    //
    // Для Этапа 3 сделаем proxy через явный метод. В Этапе 4 — введём
    // metatable на Lua-стороне (более чистый путь).

    // Возвращаем api для main-loop
    return {
        onSceneSnapshot(snap) {
            try {
                const prims = snap?.primitives || [];
                // Сохраняем Camera/Terrain
                const kept = workspace.Children.filter(c =>
                    c.ClassName === 'Camera' || c.ClassName === 'Terrain'
                );
                workspace.Children.length = 0;
                workspace.Children.push(...kept);
                partById.clear();
                for (const p of prims) {
                    if (!p || p.id == null) continue;
                    const part = newPart(p, send);  // setters внутри шлют через send
                    part.Parent = workspace;
                    workspace.Children.push(part);
                    partById.set(Number(p.id), part);
                }
                // eslint-disable-next-line no-console
                console.log(`[shim] DataModel: workspace has ${workspace.Children.length} children, ${partById.size} parts`);
            } catch (e) {
                send('log', { level: 'error', text: `[shim onSceneSnapshot] ${e?.message || e}` });
            }
        },
        onGuiSnapshot() {},
        onDataSnapshot() {},

        tickScheduler(_dt) {
            // 0. Tweens
            _stepTweens(_dt);
            const now = SCHEDULER.now();
            // 1. task.delay / task.defer
            if (SCHEDULER.sleeping.length > 0) {
                const ready = [];
                const rest = [];
                for (const t of SCHEDULER.sleeping) {
                    if (t.wakeAt <= now) ready.push(t); else rest.push(t);
                }
                SCHEDULER.sleeping = rest;
                for (const t of ready) {
                    try { t.run(); } catch (_) {}
                }
            }
            // 2. Резюм coroutine'ов которые task.wait()
            const dueCoros = [];
            for (let i = waitingCoros.length - 1; i >= 0; i--) {
                if (waitingCoros[i].wakeAt <= now) {
                    dueCoros.push(waitingCoros[i]);
                    waitingCoros.splice(i, 1);
                }
            }
            for (const entry of dueCoros) {
                const co = coroutines.get(entry.coId);
                if (!co) continue;
                try {
                    const result = luaResumeCo(co);
                    if (result === null || result === undefined) {
                        coroutines.delete(entry.coId);
                    } else if (typeof result === 'number') {
                        waitingCoros.push({
                            coId: entry.coId,
                            wakeAt: SCHEDULER.now() + result * 1000,
                        });
                    } else if (result === false) {
                        coroutines.delete(entry.coId);
                    }
                } catch (e) {
                    send('log', { level: 'error', text: `[coroutine ${entry.coId}] ${e?.message || e}` });
                    coroutines.delete(entry.coId);
                }
            }
        },
        fireHeartbeat(dt) {
            try { HEARTBEAT_SIGNAL.Fire(dt); } catch (_) {}
            try { STEPPED_SIGNAL.Fire(performance.now() / 1000, dt); } catch (_) {}
        },
        fireTargetEvent(p) {
            if (!p) return;
            const id = p.primId ?? p.target;
            const part = partById.get(Number(id));
            if (!part) return;
            if (p.kind === 'touch' || p.kind === 'touched') {
                part.Touched.Fire(hrp);
            } else if (p.kind === 'untouch' || p.kind === 'untouched') {
                part.TouchEnded.Fire(hrp);
            }
        },
        fireGlobalEvent(p) {
            if (!p) return;
            if (p.type === 'playerTouch' && p.target != null) {
                let primId = null;
                if (typeof p.target === 'number') primId = p.target;
                else if (typeof p.target === 'string') {
                    const m = /^primitive:(\d+)$/.exec(p.target);
                    if (m) primId = +m[1];
                } else if (typeof p.target === 'object') {
                    primId = p.target.id ?? p.target.ref ?? null;
                }
                if (primId != null) {
                    const part = partById.get(Number(primId));
                    if (part?.Touched) part.Touched.Fire(hrp);
                    if (humanoid.Touched) humanoid.Touched.Fire(part);
                }
            }
        },
        // Доступ к ключевым объектам (для тестов и отладки)
        partById, localPlayer, humanoid, character, workspace, players, game,
    };
}