import * as _ from "@preserves/core";

export const $Instance = Symbol.for("Instance");

export const Instance = _.Record.makeConstructor<{"_field0": string, "_field1": _val}, _ptr>()($Instance, ["_field0","_field1"]);

export type Instance = _.Record<(typeof $Instance), [string, _val], _ptr>;

export type _ptr = never;

export type _val = _.Value<_ptr>;


export function isInstance(v: any): v is Instance {
    return (
        _.Record.isRecord<_val, _.Tuple<_val>, _ptr>(v) &&
        _.is(v.label, $Instance) &&
        ((v.length === 2) && typeof v[0] === 'string' && true)
    );
}

export function asInstance(v: any): Instance {
    if (!isInstance(v)) {throw new TypeError(`Invalid Instance: ${_.stringify(v)}`);} else {return v;};
}

export function decodeInstance(d: _.TypedDecoder<_ptr>): Instance | undefined {
    let result;
    if (d.openRecord()) {
        let _tmp0: any;
        _tmp0 = _.asLiteral(d.nextSymbol(), $Instance);
        if (_tmp0 !== void 0) {
            let _tmp1, _tmp2, _tmp3: any;
            _tmp2 = d.nextString();
            if (_tmp2 !== void 0) {
                _tmp3 = d.next();
                if (_tmp3 !== void 0) {if (d.closeCompound()) _tmp1 = [_tmp2, _tmp3];};
            };
            if (_tmp1 !== void 0) result = _.Record<(typeof $Instance), [string, _val]>(_tmp0 as any, _tmp1 as any);
        };
    };
    return result;
}

export const _decodePtr = () => { throw new _.DecodeError("Pointers forbidden"); };