#include "core.h"

#include "imgui/imgui.h"
#include "imgui/backends/imgui_impl_glfw.h"
#include "imgui/backends/imgui_impl_opengl3.h"
#include <imgui/imgui_internal.h>

using namespace Engine;

inline void SetupImGuiStyle(bool bStyleDark_, float alpha_)
{
    ImGuiStyle& style = ImGui::GetStyle();

    // light style from Pacôme Danhiez (user itamago) https://github.com/ocornut/imgui/pull/511#issuecomment-175719267
    style.Alpha = 1.0f;
    
    style.FrameRounding = 4.0f;  // Rounded corners for a modern look
    style.WindowRounding = 4.0f;
    style.GrabRounding = 4.0f;
    style.ScrollbarRounding = 4.0f;
    style.ChildRounding = 4.0f;
    style.ItemSpacing = ImVec2(5.0f, 5.0f);
    style.ScaleAllSizes(3.0f);
    
    style.Colors[ImGuiCol_Text] = ImVec4(0.00f, 0.00f, 0.00f, 1.00f);
    style.Colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
    style.Colors[ImGuiCol_WindowBg] = ImVec4(0.94f, 0.94f, 0.94f, 0.94f);
    //style.Colors[ImGuiCol_ChildWindowBg] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
    style.Colors[ImGuiCol_PopupBg] = ImVec4(1.00f, 1.00f, 1.00f, 0.94f);
    style.Colors[ImGuiCol_Border] = ImVec4(0.00f, 0.00f, 0.00f, 0.39f);
    style.Colors[ImGuiCol_BorderShadow] = ImVec4(1.00f, 1.00f, 1.00f, 0.10f);
    style.Colors[ImGuiCol_FrameBg] = ImVec4(1.00f, 1.00f, 1.00f, 0.94f);
    style.Colors[ImGuiCol_FrameBgHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.40f);
    style.Colors[ImGuiCol_FrameBgActive] = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
    style.Colors[ImGuiCol_TitleBg] = ImVec4(0.96f, 0.96f, 0.96f, 1.00f);
    style.Colors[ImGuiCol_TitleBgCollapsed] = ImVec4(1.00f, 1.00f, 1.00f, 0.51f);
    style.Colors[ImGuiCol_TitleBgActive] = ImVec4(0.82f, 0.82f, 0.82f, 1.00f);
    style.Colors[ImGuiCol_MenuBarBg] = ImVec4(0.86f, 0.86f, 0.86f, 1.00f);
    style.Colors[ImGuiCol_ScrollbarBg] = ImVec4(0.98f, 0.98f, 0.98f, 0.53f);
    style.Colors[ImGuiCol_ScrollbarGrab] = ImVec4(0.69f, 0.69f, 0.69f, 1.00f);
    style.Colors[ImGuiCol_ScrollbarGrabHovered] = ImVec4(0.59f, 0.59f, 0.59f, 1.00f);
    style.Colors[ImGuiCol_ScrollbarGrabActive] = ImVec4(0.49f, 0.49f, 0.49f, 1.00f);
    //style.Colors[ImGuiCol_ComboBg] = ImVec4(0.86f, 0.86f, 0.86f, 0.99f);
    style.Colors[ImGuiCol_CheckMark] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    style.Colors[ImGuiCol_SliderGrab] = ImVec4(0.24f, 0.52f, 0.88f, 1.00f);
    style.Colors[ImGuiCol_SliderGrabActive] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    style.Colors[ImGuiCol_Button] = ImVec4(0.26f, 0.59f, 0.98f, 0.40f);
    style.Colors[ImGuiCol_ButtonHovered] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    style.Colors[ImGuiCol_ButtonActive] = ImVec4(0.06f, 0.53f, 0.98f, 1.00f);
    style.Colors[ImGuiCol_Header] = ImVec4(0.26f, 0.59f, 0.98f, 0.31f);
    style.Colors[ImGuiCol_HeaderHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.80f);
    style.Colors[ImGuiCol_HeaderActive] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    //style.Colors[ImGuiCol_Column] = ImVec4(0.39f, 0.39f, 0.39f, 1.00f);
    //style.Colors[ImGuiCol_ColumnHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.78f);
    //style.Colors[ImGuiCol_ColumnActive] = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
    style.Colors[ImGuiCol_ResizeGrip] = ImVec4(1.00f, 1.00f, 1.00f, 0.50f);
    style.Colors[ImGuiCol_ResizeGripHovered] = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
    style.Colors[ImGuiCol_ResizeGripActive] = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
    //style.Colors[ImGuiCol_CloseButton] = ImVec4(0.59f, 0.59f, 0.59f, 0.50f);
    //style.Colors[ImGuiCol_CloseButtonHovered] = ImVec4(0.98f, 0.39f, 0.36f, 1.00f);
    //style.Colors[ImGuiCol_CloseButtonActive] = ImVec4(0.98f, 0.39f, 0.36f, 1.00f);
    //style.Colors[ImGuiCol_PlotLines] = ImVec4(0.39f, 0.39f, 0.39f, 1.00f);
    style.Colors[ImGuiCol_PlotLinesHovered] = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
    style.Colors[ImGuiCol_PlotHistogram] = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
    style.Colors[ImGuiCol_PlotHistogramHovered] = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
    style.Colors[ImGuiCol_TextSelectedBg] = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
    //style.Colors[ImGuiCol_ModalWindowDarkening] = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);

    if (bStyleDark_)
    {
        for (int i = 0; i <= ImGuiCol_COUNT; i++)
        {
            ImVec4& col = style.Colors[i];
            float H, S, V;
            ImGui::ColorConvertRGBtoHSV(col.x, col.y, col.z, H, S, V);

            if (S < 0.1f)
            {
                V = 1.0f - V;
            }
            ImGui::ColorConvertHSVtoRGB(H, S, V, col.x, col.y, col.z);
            if (col.w < 1.00f)
            {
                col.w *= alpha_;
            }
        }
    }
    else
    {
        for (int i = 0; i <= ImGuiCol_COUNT; i++)
        {
            ImVec4& col = style.Colors[i];
            if (col.w < 1.00f)
            {
                col.x *= alpha_;
                col.y *= alpha_;
                col.z *= alpha_;
                col.w *= alpha_;
            }
        }
    }
}