/*

 * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>

 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/Badge.h>

#include <AK/OwnPtr.h>

#include <AK/StringView.h>

#include <AK/Weakable.h>

#include <LibJS/Bytecode/Builtins.h>

#include <LibJS/Heap/Cell.h>

#include <LibJS/Heap/CellAllocator.h>

#include <LibJS/Runtime/Intrinsics.h>

#include <LibJS/Runtime/Value.h>

namespace JS {

// 9.3 Realms, https://tc39.es/ecma262/#realm-record

class Realm final : public Cell {

    JS_CELL(Realm, Cell);

    JS_DECLARE_ALLOCATOR(Realm);

public:

    struct HostDefined {

        virtual ~HostDefined() = default;

        virtual void visit_edges(Cell::Visitor&) { }

    };

    static ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> initialize_host_defined_realm(VM&, Function<Object*(Realm&)> create_global_object, Function<Object*(Realm&)> create_global_this_value);

    [[nodiscard]] Object& global_object() const { return *m_global_object; }

    [[nodiscard]] GlobalEnvironment& global_environment() const { return *m_global_environment; }

    [[nodiscard]] Intrinsics const& intrinsics() const { return *m_intrinsics; }

    [[nodiscard]] Intrinsics& intrinsics() { return *m_intrinsics; }

    void set_intrinsics(Badge<Intrinsics>, Intrinsics& intrinsics)

    {

        VERIFY(!m_intrinsics);

        m_intrinsics = &intrinsics;

    }

    HostDefined* host_defined() { return m_host_defined; }

    void set_host_defined(OwnPtr<HostDefined> host_defined) { m_host_defined = move(host_defined); }

    void define_builtin(Bytecode::Builtin builtin, NonnullGCPtr<NativeFunction> value)

    {

        m_builtins[to_underlying(builtin)] = value;

    }

    NonnullGCPtr<NativeFunction> get_builtin_value(Bytecode::Builtin builtin)

    {

        return *m_builtins[to_underlying(builtin)];

    }

private:

    Realm() = default;

    virtual void visit_edges(Visitor&) override;

    GCPtr<Intrinsics> m_intrinsics;                // [[Intrinsics]]

    GCPtr<Object> m_global_object;                 // [[GlobalObject]]

    GCPtr<GlobalEnvironment> m_global_environment; // [[GlobalEnv]]

    OwnPtr<HostDefined> m_host_defined;            // [[HostDefined]]

    AK::Array<GCPtr<NativeFunction>, to_underlying(Bytecode::Builtin::__Count)> m_builtins;

};

}