#include <AK/String.h>
#include <AK/TypeCasts.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/PromiseConstructor.h>
#include <LibJS/Runtime/PropertyKey.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ClipboardItem.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Clipboard/ClipboardItem.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Promise.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

void ClipboardItemConstructor::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(1), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "ClipboardItem"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<ClipboardItemPrototype>(realm, "ClipboardItem"_fly_string), 0);
    object.define_native_function(realm, "supports"_utf16_fly_string, supports, 1, JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable);

}

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

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

    // 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<ClipboardItemPrototype>(*target_realm, "ClipboardItem"_fly_string);
    }

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

    auto arg0 = vm.argument(0);
    auto items = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<GC::OrderedRootHashMap<String, GC::Ref<WebIDL::Promise>>> {
        // An ECMAScript value O is converted to an IDL record<K, V> value as follows:
        // 1. If Type(O) is not Object, throw a TypeError.
        if (!arg0.is_object())
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, arg0);

        auto& record_object0 = arg0.as_object();

        // 2. Let result be a new empty instance of record<K, V>.
        GC::OrderedRootHashMap<String, GC::Ref<WebIDL::Promise>> record;

        // 3. Let keys be ? O.[[OwnPropertyKeys]]().
        auto keys = TRY(record_object0.internal_own_property_keys());

        // 4. For each key of keys:
        for (auto& key : keys) {
            auto property_key = MUST(JS::PropertyKey::from_value(vm, key));

            // 1. Let desc be ? O.[[GetOwnProperty]](key).
            auto desc = TRY(record_object0.internal_get_own_property(property_key));

            // 2. If desc is not undefined and desc.[[Enumerable]] is true:
            if (!desc.has_value() || !desc->enumerable.has_value() || !desc->enumerable.value())
                continue;

            // 1. Let typedKey be key converted to an IDL value of type K.
            auto typed_key = TRY([&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, key));
    }());

            // 2. Let value be ? Get(O, key).
            auto value = TRY(record_object0.get(property_key));

            // 3. Let typedValue be value converted to an IDL value of type V.
            auto typed_value = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        auto& realm = *vm.current_realm();

        // 1. Let promiseCapability be ? NewPromiseCapability(%Promise%).
        auto promise_capability0 = TRY(JS::new_promise_capability(vm, realm.intrinsics().promise_constructor()));

        // 2. Perform ? Call(promiseCapability.[[Resolve]], undefined, « V »).
        TRY(JS::call(vm, *promise_capability0->resolve(), JS::js_undefined(), value));

        // 3. Return promiseCapability.
        return promise_capability0;
    }());

            // 4. Set result[typedKey] to typedValue.
            record.set(typed_key, typed_value);
        }

        // 5. Return result.
        return record;
    }(); }));

    auto arg1 = vm.argument(1);
    ClipboardItemOptions options = ClipboardItemOptions {};
    if (!arg1.is_undefined())
        options = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_clipboard_item_options(vm, arg1); }));

    auto impl = TRY(throw_dom_exception_if_needed(vm, [&] { return Clipboard::ClipboardItem::construct_impl(realm, items, options); }));

    // 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 ClipboardItem" algorithm
    // (https://webidl.spec.whatwg.org/#js-platform-objects) are currently not handled, or are handled within Clipboard::ClipboardItem::construct_impl().

    return *impl;
}

void ClipboardItemPrototype::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());

    auto presentation_style_id = "presentationStyle"_utf16_fly_string;
    auto native_presentation_style_getter = JS::NativeFunction::create(realm, presentation_style_getter, 0, presentation_style_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_presentation_style_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto presentation_style_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(presentation_style_id, native_presentation_style_getter, native_presentation_style_setter, presentation_style_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto types_id = "types"_utf16_fly_string;
    auto native_types_getter = JS::NativeFunction::create(realm, types_getter, 0, types_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_types_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto types_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(types_id, native_types_getter, native_types_setter, types_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    object.define_native_function(realm, "getType"_utf16_fly_string, get_type, 1, default_attributes);

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

void ClipboardItemPrototype::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<Clipboard::ClipboardItem*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<Clipboard::ClipboardItem*> 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(ClipboardItemConstructor::supports)
{
    WebIDL::log_trace(vm, "ClipboardItemConstructor::supports");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    if (vm.argument_count() < 1)
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "supports");

    auto arg0 = vm.argument(0);
    auto type = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return Clipboard::ClipboardItem::supports(vm, type); }));
    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(ClipboardItemPrototype::presentation_style_getter)
{
    WebIDL::log_trace(vm, "ClipboardItemPrototype::presentation_style_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->presentation_style(); }));

    return JS::PrimitiveString::create(vm, idl_enum_to_string(R));
}

JS_DEFINE_NATIVE_FUNCTION(ClipboardItemPrototype::types_getter)
{
    WebIDL::log_trace(vm, "ClipboardItemPrototype::types_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->types(); }));

    return [&]() -> JS::Value {
        // An IDL sequence<T> value S is converted to a JavaScript value as follows:
        // 1. Let n be the length of S.
        auto sequence_length = R.size();

        // 2. Let A be a new Array object created as if by the expression [].
        auto sequence_array = MUST(JS::Array::create(realm, sequence_length));

        // 3. Initialize i to be 0.
        // 4. While i < n:
        for (size_t sequence_index = 0; sequence_index < sequence_length; ++sequence_index) {
            // 1. Let V be the value in S at index i.
            auto& sequence_element = R.at(sequence_index);

            // 2. Let E be the result of converting V to a JavaScript value.
            JS::Value js_sequence_element = WebIDL::primitive_string_from_string(vm, sequence_element);

            // 3. Let P be the result of calling ! ToString(i).
            // 4. Perform ! CreateDataPropertyOrThrow(A, P, E).
            MUST(sequence_array->create_data_property(JS::PropertyKey { sequence_index }, js_sequence_element));

            // 5. Set i to i + 1.
        }

        MUST(sequence_array->set_integrity_level(JS::Object::IntegrityLevel::Frozen));

        // 5. Return A.
        return sequence_array;
    }();
}

JS_DEFINE_NATIVE_FUNCTION(ClipboardItemPrototype::get_type)
{
    WebIDL::log_trace(vm, "ClipboardItemPrototype::get_type");
    [[maybe_unused]] auto& realm = *vm.current_realm();
    auto steps = [&realm, &vm]() -> JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> {
        (void)realm;
    [[maybe_unused]] Clipboard::ClipboardItem* idl_object = TRY(impl_from(vm));

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

    auto arg0 = vm.argument(0);
    auto type = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, arg0));
    }(); }));

    [[maybe_unused]] auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->get_type(type); }));
        return R;
    };

    auto maybe_R = steps();

    // And then, if an exception E was thrown:
    // 1. If op has a return type that is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
    // 2. Otherwise, end these steps and allow the exception to propagate.
    if (maybe_R.is_throw_completion())
        return WebIDL::create_rejected_promise(realm, maybe_R.error_value())->promise();

    return GC::Ref { as<JS::Promise>(*maybe_R.release_value()->promise()) };
}

// https://webidl.spec.whatwg.org/#idl-enumeration
JS::ThrowCompletionOr<PresentationStyle> convert_to_idl_value_for_presentation_style(JS::VM& vm, JS::Value value)
{
    // 1. Let S be the result of calling ? ToString(V).
    auto value_as_string = TRY(value.to_utf16_string(vm));

    // 2. If S is not one of E’s enumeration values, then throw a TypeError.
    // 3. Return the enumeration value of type E that is equal to S.
    if (value_as_string == "unspecified"sv)
        return PresentationStyle::Unspecified;
    if (value_as_string == "inline"sv)
        return PresentationStyle::Inline;
    if (value_as_string == "attachment"sv)
        return PresentationStyle::Attachment;
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidEnumerationValue, value_as_string, "PresentationStyle");
}

// https://webidl.spec.whatwg.org/#idl-enumeration
Utf16String idl_enum_to_string(PresentationStyle value)
{
    // The result of converting an IDL enumeration type value to a JavaScript value is the String value that represents the same sequence of code units as the enumeration value.
    switch (value) {
    case PresentationStyle::Unspecified:
        return "unspecified"_utf16;
    case PresentationStyle::Inline:
        return "inline"_utf16;
    case PresentationStyle::Attachment:
        return "attachment"_utf16;
    }
    VERIFY_NOT_REACHED();
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<ClipboardItemOptions> convert_to_idl_value_for_clipboard_item_options(JS::VM& vm, JS::Value js_dict)
{
    // 1. If jsDict is not an Object and jsDict is neither undefined nor null, then throw a TypeError.
    if (!js_dict.is_object() && !js_dict.is_nullish())
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "ClipboardItemOptions");

    // 2. Let idlDict be an empty ordered map, representing a dictionary of type D.
    // 3. Let dictionaries be a list consisting of D and all of D’s inherited dictionaries, in order from least to most derived.
    // 4. For each dictionary dictionary in dictionaries, in order:
    // NB: We defer construction until the return initializer because some members may not be default-constructible. Inherited dictionaries are represented by the generated C++ struct inheritance.

    // 5. Return idlDict.
    return ClipboardItemOptions {
        .presentation_style = TRY([&]() -> JS::ThrowCompletionOr<PresentationStyle> {
            // 1. Let key be the identifier of member.
            // 2. If jsDict is either undefined or null, then:
            //     1. Let jsMemberValue be undefined.
            // 3. Otherwise,
            //     1. Let jsMemberValue be ? Get(jsDict, key).
            auto js_member_value = JS::js_undefined();
            if (js_dict.is_object())
                js_member_value = TRY(js_dict.as_object().get("presentationStyle"_utf16_fly_string));

            // 4. If jsMemberValue is not undefined, then:
            if (!js_member_value.is_undefined()) {
                // 1. Let idlMemberValue be the result of converting jsMemberValue to an IDL value whose type is the type member is declared to be of.
                auto idl_member_value = TRY(throw_dom_exception_if_needed(vm, [&] { return convert_to_idl_value_for_presentation_style(vm, js_member_value); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 5. Otherwise, if jsMemberValue is undefined but member has a default value, then:
            // 1. Let idlMemberValue be the result of converting member's default value to an IDL value whose type is the type member is declared to be of.
            auto idl_member_value = PresentationStyle::Unspecified;

            // 2. Set idlDict[key] to idlMemberValue.
            return idl_member_value;
        }()),
    };
}

} // namespace Web::Bindings