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#include "inspect.hpp"
#include "compat/assert.hpp"
#include "compat/defs.hpp"
#include "entity/accessor.hpp"
#include "imgui-raii.hpp"
#include <Corrade/Containers/ArrayView.h>
#include <Corrade/Containers/String.h>
#include <Corrade/Containers/StringIterable.h>
#include <Magnum/Math/Vector.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/Math/Vector3.h>
#include <Magnum/Math/Vector4.h>
#include <algorithm>
namespace floormat::entities {
namespace {
using erased_constraints::is_magnum_vector;
String label_left(StringView label)
{
float width = ImGui::CalcItemWidth(), x = ImGui::GetCursorPosX();
ImGui::Text("%s", label.data());
ImGui::SameLine();
ImGui::SetCursorPosX(x + width*.5f + ImGui::GetStyle().ItemInnerSpacing.x);
ImGui::SetNextItemWidth(-1);
return ""_s.join(StringIterable({ "##"_s, label }));
}
template<typename T> struct IGDT_;
template<> struct IGDT_<std::uint8_t> : std::integral_constant<int, ImGuiDataType_U8> {};
template<> struct IGDT_<std::int8_t> : std::integral_constant<int, ImGuiDataType_S8> {};
template<> struct IGDT_<std::uint16_t> : std::integral_constant<int, ImGuiDataType_U16> {};
template<> struct IGDT_<std::int16_t> : std::integral_constant<int, ImGuiDataType_S16> {};
template<> struct IGDT_<std::uint32_t> : std::integral_constant<int, ImGuiDataType_U32> {};
template<> struct IGDT_<std::int32_t> : std::integral_constant<int, ImGuiDataType_S32> {};
template<> struct IGDT_<float> : std::integral_constant<int, ImGuiDataType_Float> {};
template<typename T> constexpr auto IGDT = IGDT_<T>::value;
using namespace imgui;
using namespace entities;
template<typename T> requires std::is_integral_v<T> constexpr bool eqv(T a, T b) { return a == b; }
inline bool eqv(float a, float b) { return std::fabs(a - b) < 1e-8f; }
inline bool eqv(const String& a, const String& b) { return a == b; }
template<typename T, std::size_t N> constexpr bool eqv(const Math::Vector<N, T>& a, const Math::Vector<N, T>& b) { return a == b; }
int corrade_string_resize_callback(ImGuiInputTextCallbackData* data)
{
if (data->EventFlag == ImGuiInputTextFlags_CallbackResize)
{
auto* my_str = reinterpret_cast<String*>(data->UserData);
fm_assert(my_str->begin() == data->Buf);
String tmp = std::move(*my_str);
*my_str = String{ValueInit, (std::size_t)data->BufSize};
auto len = std::min(tmp.size(), my_str->size());
for (std::size_t i = 0; i < len; i++)
(*my_str)[i] = tmp[i];
data->Buf = my_str->begin();
}
return 0;
}
template<typename T>
void do_inspect_field(void* datum, const erased_accessor& accessor, field_repr repr,
const ArrayView<const std::pair<StringView, std::size_t>>& list)
{
if (list.isEmpty())
fm_assert(accessor.check_field_type<T>());
fm_assert(!list.isEmpty() == (repr == field_repr::cbx));
bool should_disable;
switch (accessor.is_enabled(datum))
{
using enum field_status;
case hidden: return;
case readonly: should_disable = true; break;
case enabled: should_disable = false; break;
}
should_disable = should_disable || !accessor.can_write();
[[maybe_unused]] auto disabler = begin_disabled(should_disable);
bool ret = false;
const auto label = label_left(accessor.field_name);
T value{};
accessor.read_fun(datum, accessor.reader, &value);
auto orig = value;
if constexpr(std::is_same_v<T, String>)
{
ret = ImGui::InputText(label.data(), value.begin(), value.size(), ImGuiInputTextFlags_CallbackResize, corrade_string_resize_callback, &value);
if (auto max_len = accessor.get_max_length(datum); value.size() > max_len)
value = value.prefix(max_len);
}
else if constexpr(std::is_same_v<T, bool>)
ret = ImGui::Checkbox(label.data(), &value);
else if constexpr (!is_magnum_vector<T>)
{
auto [min, max] = accessor.get_range(datum).convert<T>();
constexpr auto igdt = IGDT<T>;
T step(1), *step_ = !std::is_floating_point_v<T> ? &step : nullptr;
switch (repr)
{
default: fm_warn_once("invalid repr enum value '%zu'", (std::size_t)repr); break;
case field_repr::input: ret = ImGui::InputScalar(label.data(), igdt, &value, &step_); break;
case field_repr::slider: ret = ImGui::SliderScalar(label.data(), igdt, &value, &min, &max); break;
case field_repr::drag: ret = ImGui::DragScalar(label.data(), igdt, &value, 1, &min, &max); break;
case field_repr::cbx: {
if constexpr(std::is_integral_v<T>)
{
const char* preview = "<invalid>";
const auto old_value = (std::size_t)static_cast<std::make_unsigned_t<T>>(value);
for (const auto& [str, x] : list)
if (x == old_value)
{
preview = str.data();
break;
}
for (auto b = begin_combo(label.data(), preview);
const auto& [str, x] : list)
{
const bool is_selected = x == (std::size_t)old_value;
if (ImGui::Selectable(str.data(), is_selected))
value = T(x);
if (is_selected)
ImGui::SetItemDefaultFocus();
}
break;
}
}
}
value = std::clamp(value, min, max);
}
else
{
using U = typename T::Type;
auto [min, max] = accessor.get_range(datum).convert<T>();
constexpr auto igdt = IGDT<U>;
T step = T(U(1)), *step_ = !std::is_floating_point_v<U> ? &step : nullptr;
switch (repr)
{
default:
fm_warn_once("invalid repr enum value '%zu'", (std::size_t)repr);
break;
case field_repr::input:
ret = ImGui::InputScalarN(label.data(), igdt, &value, T::Size, &step_);
break;
case field_repr::drag:
fm_warn_once("can't use imgui input drag mode for vector type");
[[fallthrough]];
case field_repr::slider:
ret = ImGui::SliderScalarN(label.data(), igdt, &value, T::Size, &min, &max);
break;
}
for (std::size_t i = 0; i < T::Size; i++)
value[i] = std::clamp(value[i], min[i], max[i]);
}
ImGui::NewLine();
if (ret && !should_disable && !eqv(value, orig))
if (accessor.is_enabled(datum) >= field_status::enabled && accessor.can_write())
accessor.write_fun(datum, accessor.writer, &value);
}
} // namespace
#define MAKE_SPEC(type, repr) \
template<> \
void inspect_field<type>(void* datum, const erased_accessor& accessor, \
const ArrayView<const std::pair<StringView, std::size_t>>& list) \
{ \
do_inspect_field<type>(datum, accessor, (repr), list); \
}
#define MAKE_SPEC2(type, repr) \
template<> \
void inspect_field<field_repr_<type, field_repr, repr>>(void* datum, const erased_accessor& accessor, \
const ArrayView<const std::pair<StringView, std::size_t>>& list) \
{ \
do_inspect_field<type>(datum, accessor, (repr), list); \
}
#define MAKE_SPEC_REPRS(type) \
MAKE_SPEC2(type, field_repr::input) \
MAKE_SPEC2(type, field_repr::slider) \
MAKE_SPEC2(type, field_repr::drag) \
MAKE_SPEC(type, field_repr::input)
#define MAKE_SPEC_REPRS2(type) \
MAKE_SPEC_REPRS(Math::Vector2<type>) \
MAKE_SPEC_REPRS(Math::Vector3<type>) \
MAKE_SPEC_REPRS(Math::Vector4<type>) \
MAKE_SPEC_REPRS(type) \
MAKE_SPEC2(type, field_repr::cbx)
MAKE_SPEC_REPRS2(std::uint8_t)
MAKE_SPEC_REPRS2(std::int8_t)
MAKE_SPEC_REPRS2(std::uint16_t)
MAKE_SPEC_REPRS2(std::int16_t)
MAKE_SPEC_REPRS2(std::uint32_t)
MAKE_SPEC_REPRS2(std::int32_t)
MAKE_SPEC_REPRS2(float)
MAKE_SPEC(bool, field_repr::input)
MAKE_SPEC(String, field_repr::input)
} // namespace floormat::entities
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