#include <AK/String.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/FileReaderSync.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/FileAPI/Blob.h>
#include <LibWeb/FileAPI/FileReaderSync.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

void FileReaderSyncConstructor::initialize(JS::Realm& realm, JS::NativeFunction& object)
{
    auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;

    
    object.define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "FileReaderSync"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<FileReaderSyncPrototype>(realm, "FileReaderSync"_fly_string), 0);
}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> FileReaderSyncConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "FileReaderSyncConstructor::construct");
    auto& vm = constructor.vm();
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // To internally create a new object implementing the interface FileReaderSync:

    // 3.2. Let prototype be ? Get(newTarget, "prototype").
    auto prototype = TRY(new_target.get(vm.names.prototype));

    // 3.3. If Type(prototype) is not Object, then:
    if (!prototype.is_object()) {
        // 1. Let targetRealm be ? GetFunctionRealm(newTarget).
        auto* target_realm = TRY(JS::get_function_realm(vm, new_target));

        // 2. Set prototype to the interface prototype object for interface in targetRealm.
        VERIFY(target_realm);
        prototype = &Bindings::ensure_web_prototype<FileReaderSyncPrototype>(*target_realm, "FileReaderSync"_fly_string);
    }

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return FileAPI::FileReaderSync::construct_impl(realm); }));

    // 7. Set instance.[[Prototype]] to prototype.
    VERIFY(prototype.is_object());
    impl->set_prototype(&prototype.as_object());

    // FIXME: Steps 8...11. of the "internally create a new object implementing the interface FileReaderSync" algorithm
    // (https://webidl.spec.whatwg.org/#js-platform-objects) are currently not handled, or are handled within FileAPI::FileReaderSync::construct_impl().

    return *impl;
}

void FileReaderSyncPrototype::initialize(JS::Realm& realm, JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable;

    object.set_prototype(realm.intrinsics().object_prototype());
    object.define_native_function(realm, "readAsArrayBuffer"_utf16_fly_string, read_as_array_buffer, 1, default_attributes);

    object.define_native_function(realm, "readAsText"_utf16_fly_string, read_as_text, 1, default_attributes);

    object.define_native_function(realm, "readAsBinaryString"_utf16_fly_string, read_as_binary_string, 1, default_attributes);

    object.define_native_function(realm, "readAsDataURL"_utf16_fly_string, read_as_data_url, 1, default_attributes);

    object.define_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "FileReaderSync"_utf16), JS::Attribute::Configurable);
}

void FileReaderSyncPrototype::define_unforgeable_attributes(JS::Realm& realm, [[maybe_unused]] JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;
}

[[maybe_unused]] static JS::ThrowCompletionOr<FileAPI::FileReaderSync*> impl_from(JS::VM& vm, JS::Value js_value)
{

    if (auto impl = js_value.as_if<FileAPI::FileReaderSync>())
        return impl.ptr();
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "FileReaderSync");
}

[[maybe_unused]] static JS::ThrowCompletionOr<FileAPI::FileReaderSync*> impl_from(JS::VM& vm)
{
    auto this_value = vm.this_value();
    if (this_value.is_nullish())
        this_value = &vm.current_realm()->global_object();
    return impl_from(vm, this_value);
}

JS_DEFINE_NATIVE_FUNCTION(FileReaderSyncPrototype::read_as_array_buffer)
{
    WebIDL::log_trace(vm, "FileReaderSyncPrototype::read_as_array_buffer");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] FileAPI::FileReaderSync* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "readAsArrayBuffer");

    auto arg0 = vm.argument(0);
    auto blob = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<FileAPI::Blob>> {
        if (auto impl = arg0.as_if<FileAPI::Blob>())
            return *impl;
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Blob");
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->read_as_array_buffer(blob); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(FileReaderSyncPrototype::read_as_text)
{
    WebIDL::log_trace(vm, "FileReaderSyncPrototype::read_as_text");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] FileAPI::FileReaderSync* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "readAsText");

    auto arg0 = vm.argument(0);
    auto blob = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<FileAPI::Blob>> {
        if (auto impl = arg0.as_if<FileAPI::Blob>())
            return *impl;
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Blob");
    }(); }));

    auto arg1 = vm.argument(1);
    Optional<String> encoding {};
    if (!arg1.is_undefined())
        encoding = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, arg1));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->read_as_text(blob, encoding); }));
    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(FileReaderSyncPrototype::read_as_binary_string)
{
    WebIDL::log_trace(vm, "FileReaderSyncPrototype::read_as_binary_string");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] FileAPI::FileReaderSync* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "readAsBinaryString");

    auto arg0 = vm.argument(0);
    auto blob = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<FileAPI::Blob>> {
        if (auto impl = arg0.as_if<FileAPI::Blob>())
            return *impl;
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Blob");
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->read_as_binary_string(blob); }));
    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(FileReaderSyncPrototype::read_as_data_url)
{
    WebIDL::log_trace(vm, "FileReaderSyncPrototype::read_as_data_url");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    [[maybe_unused]] FileAPI::FileReaderSync* idl_object = TRY(impl_from(vm));

    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "readAsDataURL");

    auto arg0 = vm.argument(0);
    auto blob = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::Ref<FileAPI::Blob>> {
        if (auto impl = arg0.as_if<FileAPI::Blob>())
            return *impl;
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Blob");
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->read_as_data_url(blob); }));
    return WebIDL::primitive_string_from_string(vm, R);
}

} // namespace Web::Bindings