/*
 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/FlyString.h>
#include <AK/StringBuilder.h>
#include <LibJS/Runtime/Completion.h>
#include <LibWeb/Bindings/LocationObject.h>
#include <LibWeb/Bindings/WindowObject.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Window.h>

namespace Web::Bindings {

LocationObject::LocationObject(JS::GlobalObject& global_object)
    : Object(*global_object.object_prototype())
{
}

void LocationObject::initialize(JS::GlobalObject& global_object)
{
    auto& vm = global_object.vm();

    Object::initialize(global_object);
    u8 attr = JS::Attribute::Writable | JS::Attribute::Enumerable;
    define_native_accessor("href", href_getter, href_setter, attr);
    define_native_accessor("host", host_getter, {}, attr);
    define_native_accessor("hostname", hostname_getter, {}, attr);
    define_native_accessor("pathname", pathname_getter, {}, attr);
    define_native_accessor("hash", hash_getter, {}, attr);
    define_native_accessor("search", search_getter, {}, attr);
    define_native_accessor("protocol", protocol_getter, {}, attr);
    define_native_accessor("port", port_getter, {}, attr);

    define_native_function("reload", reload, 0, JS::Attribute::Enumerable);
    define_native_function("replace", replace, 1, JS::Attribute::Enumerable);

    define_native_function(vm.names.toString, href_getter, 0, JS::Attribute::Enumerable);
}

LocationObject::~LocationObject()
{
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::href_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    return JS::js_string(vm, window.impl().associated_document().url().to_string());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::href_setter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    auto new_href = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
    auto href_url = window.impl().associated_document().parse_url(new_href);
    if (!href_url.is_valid()) {
        vm.throw_exception<JS::URIError>(global_object, String::formatted("Invalid URL '{}'", new_href));
        return {};
    }
    window.impl().did_set_location_href({}, href_url);
    return JS::js_undefined();
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::pathname_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    return JS::js_string(vm, window.impl().associated_document().url().path());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::hostname_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    return JS::js_string(vm, window.impl().associated_document().url().host());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::host_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    auto url = window.impl().associated_document().url();
    return JS::js_string(vm, String::formatted("{}:{}", url.host(), url.port_or_default()));
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::hash_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    auto fragment = window.impl().associated_document().url().fragment();
    if (!fragment.length())
        return JS::js_string(vm, "");
    StringBuilder builder;
    builder.append('#');
    builder.append(fragment);
    return JS::js_string(vm, builder.to_string());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::search_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    auto query = window.impl().associated_document().url().query();
    if (!query.length())
        return JS::js_string(vm, "");
    StringBuilder builder;
    builder.append('?');
    builder.append(query);
    return JS::js_string(vm, builder.to_string());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::protocol_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    StringBuilder builder;
    builder.append(window.impl().associated_document().url().protocol());
    builder.append(':');
    return JS::js_string(vm, builder.to_string());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::port_getter)
{
    auto& window = static_cast<WindowObject&>(global_object);
    return JS::Value(window.impl().associated_document().url().port_or_default());
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::reload)
{
    auto& window = static_cast<WindowObject&>(global_object);
    window.impl().did_call_location_reload({});
    return JS::js_undefined();
}

JS_DEFINE_NATIVE_FUNCTION(LocationObject::replace)
{
    auto& window = static_cast<WindowObject&>(global_object);
    auto url = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
    // FIXME: This needs spec compliance work.
    window.impl().did_call_location_replace({}, move(url));
    return JS::js_undefined();
}

// https://html.spec.whatwg.org/multipage/history.html#location-setprototypeof
JS::ThrowCompletionOr<bool> LocationObject::internal_set_prototype_of(Object* prototype)
{
    // 1. Return ! SetImmutablePrototype(this, V).
    return MUST(set_immutable_prototype(prototype));
}

// https://html.spec.whatwg.org/multipage/history.html#location-isextensible
JS::ThrowCompletionOr<bool> LocationObject::internal_is_extensible() const
{
    // 1. Return true.
    return true;
}

// https://html.spec.whatwg.org/multipage/history.html#location-preventextensions
JS::ThrowCompletionOr<bool> LocationObject::internal_prevent_extensions()
{
    // 1. Return false.
    return false;
}

}