#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/DOMRectReadOnly.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/IntersectionObserverEntry.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/Geometry/DOMRectReadOnly.h>
#include <LibWeb/IntersectionObserver/IntersectionObserverEntry.h>
#include <LibWeb/WebIDL/Tracing.h>

namespace Web::Bindings {

void IntersectionObserverEntryConstructor::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, "IntersectionObserverEntry"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<IntersectionObserverEntryPrototype>(realm, "IntersectionObserverEntry"_fly_string), 0);
}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> IntersectionObserverEntryConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "IntersectionObserverEntryConstructor::construct");
    return constructor.vm().throw_completion<JS::TypeError>(JS::ErrorType::NotAConstructor, "IntersectionObserverEntry");
}

void IntersectionObserverEntryPrototype::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 time_id = "time"_utf16_fly_string;
    auto native_time_getter = JS::NativeFunction::create(realm, time_getter, 0, time_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_time_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto time_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(time_id, native_time_getter, native_time_setter, time_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 root_bounds_id = "rootBounds"_utf16_fly_string;
    auto native_root_bounds_getter = JS::NativeFunction::create(realm, root_bounds_getter, 0, root_bounds_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_root_bounds_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto root_bounds_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(root_bounds_id, native_root_bounds_getter, native_root_bounds_setter, root_bounds_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 bounding_client_rect_id = "boundingClientRect"_utf16_fly_string;
    auto native_bounding_client_rect_getter = JS::NativeFunction::create(realm, bounding_client_rect_getter, 0, bounding_client_rect_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_bounding_client_rect_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto bounding_client_rect_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(bounding_client_rect_id, native_bounding_client_rect_getter, native_bounding_client_rect_setter, bounding_client_rect_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 intersection_rect_id = "intersectionRect"_utf16_fly_string;
    auto native_intersection_rect_getter = JS::NativeFunction::create(realm, intersection_rect_getter, 0, intersection_rect_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_intersection_rect_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto intersection_rect_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(intersection_rect_id, native_intersection_rect_getter, native_intersection_rect_setter, intersection_rect_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 is_intersecting_id = "isIntersecting"_utf16_fly_string;
    auto native_is_intersecting_getter = JS::NativeFunction::create(realm, is_intersecting_getter, 0, is_intersecting_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_is_intersecting_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto is_intersecting_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(is_intersecting_id, native_is_intersecting_getter, native_is_intersecting_setter, is_intersecting_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 intersection_ratio_id = "intersectionRatio"_utf16_fly_string;
    auto native_intersection_ratio_getter = JS::NativeFunction::create(realm, intersection_ratio_getter, 0, intersection_ratio_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_intersection_ratio_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto intersection_ratio_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(intersection_ratio_id, native_intersection_ratio_getter, native_intersection_ratio_setter, intersection_ratio_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 target_id = "target"_utf16_fly_string;
    auto native_target_getter = JS::NativeFunction::create(realm, target_getter, 0, target_id, &realm, "get"sv);
    GC::Ptr<JS::NativeFunction> native_target_setter;

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto target_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(target_id, native_target_getter, native_target_setter, target_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_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "IntersectionObserverEntry"_utf16), JS::Attribute::Configurable);
}

void IntersectionObserverEntryPrototype::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<IntersectionObserver::IntersectionObserverEntry*> impl_from(JS::VM& vm, JS::Value js_value)
{

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

[[maybe_unused]] static JS::ThrowCompletionOr<IntersectionObserver::IntersectionObserverEntry*> 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(IntersectionObserverEntryPrototype::time_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::time_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->time(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::root_bounds_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::root_bounds_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->root_bounds(); }));

    return [&]() -> JS::Value {
        // 1. If the IDL nullable type T? value is null, then the JavaScript value is null.
        if (!R)
            return JS::js_null();

        // 2. Otherwise, the JavaScript value is the result of converting the IDL nullable type value to the inner IDL type T.
        return JS::Value(JS::Value(R));
    }();
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::bounding_client_rect_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::bounding_client_rect_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->bounding_client_rect(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::intersection_rect_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::intersection_rect_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->intersection_rect(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::is_intersecting_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::is_intersecting_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->is_intersecting(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::intersection_ratio_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::intersection_ratio_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->intersection_ratio(); }));

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(IntersectionObserverEntryPrototype::target_getter)
{
    WebIDL::log_trace(vm, "IntersectionObserverEntryPrototype::target_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->target(); }));

    return JS::Value(R);
}

// https://webidl.spec.whatwg.org/#es-dictionary
JS::ThrowCompletionOr<IntersectionObserverEntryInit> convert_to_idl_value_for_intersection_observer_entry_init(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, "IntersectionObserverEntryInit");

    // 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 IntersectionObserverEntryInit {
        .bounding_client_rect = TRY([&]() -> JS::ThrowCompletionOr<DOMRectInit> {
            // 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("boundingClientRect"_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_dom_rect_init(vm, js_member_value); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "boundingClientRect");
        }()),
        .intersection_ratio = TRY([&]() -> JS::ThrowCompletionOr<double> {
            // 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("intersectionRatio"_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 [&]() -> JS::ThrowCompletionOr<double> {
        auto x = TRY(js_member_value.to_double(vm));
        if (isinf(x) || isnan(x))
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidRestrictedFloatingPointParameter, "intersectionRatio");
        return x;
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "intersectionRatio");
        }()),
        .intersection_rect = TRY([&]() -> JS::ThrowCompletionOr<DOMRectInit> {
            // 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("intersectionRect"_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_dom_rect_init(vm, js_member_value); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "intersectionRect");
        }()),
        .is_intersecting = TRY([&]() -> JS::ThrowCompletionOr<bool> {
            // 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("isIntersecting"_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 js_member_value.to_boolean(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "isIntersecting");
        }()),
        .root_bounds = TRY([&]() -> JS::ThrowCompletionOr<Optional<DOMRectInit>> {
            // 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("rootBounds"_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 [&]() -> JS::ThrowCompletionOr<Optional<DOMRectInit>> {
        Optional<DOMRectInit> value;

        if (!js_member_value.is_nullish()) {

            value = TRY(convert_to_idl_value_for_dom_rect_init(vm, js_member_value));
        }
        return value;
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "rootBounds");
        }()),
        .target = TRY([&]() -> JS::ThrowCompletionOr<GC::Ref<DOM::Element>> {
            // 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("target"_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 [&]() -> JS::ThrowCompletionOr<GC::Ref<DOM::Element>> {
        if (auto impl = js_member_value.as_if<DOM::Element>())
            return *impl;
        return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Element");
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "target");
        }()),
        .time = TRY([&]() -> JS::ThrowCompletionOr<double> {
            // 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("time"_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 [&]() -> JS::ThrowCompletionOr<double> {
        auto x = TRY(js_member_value.to_double(vm));
        if (isinf(x) || isnan(x))
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::InvalidRestrictedFloatingPointParameter, "time");
        return x;
    }(); }));

                // 2. Set idlDict[key] to idlMemberValue.
                return idl_member_value;
            }
            // 6. Otherwise, if jsMemberValue is undefined and member is required, then throw a TypeError.
            return vm.throw_completion<JS::TypeError>(JS::ErrorType::MissingRequiredProperty, "time");
        }()),
    };
}

} // namespace Web::Bindings