#define IMGUI_DISABLE_INCLUDE_IMCONFIG_H
#define IMGUI_HAS_DOCK 1

#include <imgui.h>
#include <reshade.hpp>
#include <fstream>
#include <string>
#include <Windows.h>

// Screen informations
static int screenWidth = GetSystemMetrics(SM_CXSCREEN);
static int screenHeight = GetSystemMetrics(SM_CYSCREEN);
static float aspectRatio = (float)screenWidth / screenHeight;

// Core game dll functions declarations
typedef void (*SetBoolFn)(bool, bool);
typedef void (*SetIntFn)(int);
typedef float (*GetFloatFn)();
typedef bool (*GetBoolFn)();

static HMODULE fixLib = nullptr;
static LONG g_coreInitialized = 0;
static SetBoolFn SetFixEnabled = nullptr;
static SetBoolFn SetFOVFixEnabled = nullptr;
static SetBoolFn SetFPSFixEnabled = nullptr;
static SetBoolFn SetResolutionFixEnabled = nullptr;
static SetBoolFn SetAspectRatioFixEnabled = nullptr;
static SetBoolFn SetDOFFixEnabled = nullptr;
static SetBoolFn SetCAFixEnabled = nullptr;
static SetBoolFn SetVignettingFixEnabled = nullptr;
static SetBoolFn SetFogFixEnabled = nullptr;
static SetIntFn SetFOV = nullptr;

static GetFloatFn GetFOVIn = nullptr;
static GetFloatFn GetCompensadedFOV = nullptr;
static GetFloatFn GetFOVOut = nullptr;
static GetBoolFn GetConsoleEnabled = nullptr;

// Plugin variables for checkboxes and sliders
static bool fov_fix_enabled = false;
static bool FPS_fix_enabled = false;
static bool Resolution_fix_enabled = false;
static bool Aspect_fix_enabled = false;
static bool DOF_fix_enabled = false;
static bool CA_fix_enabled = false;
static bool Vignetting_fix_enabled = false;
static bool Fog_fix_enabled = false;
static bool fix_enabled = false;
static int worldFOVvalue = 0;

static bool popup_Informations = false;

// Plugin settings
const char* SETTINGS_FILE = "PluginSettings.ini";
const char* GENERAL_FIX_SETTING = "GeneralFIX=";
const char* WORLD_FOV_FIX_SETTING = "WorldFOVFIX=";
const char* FPS_FIX_SETTING = "FPSFIX=";
const char* DOF_FIX_SETTING = "DOFFIX=";
const char* CA_FIX_SETTING = "ChromaticAberrationsFIX=";
const char* VIGNETTING_FIX_SETTING = "VignettingFIX=";
const char* FOG_FIX_SETTING = "FogFIX=";
const char* WORLD_FOV_SETTING = "WorldFOV=";
const char* FIX_VERSION = "1.0.5";
const char* FIX_INFORMATIONS = "This fix allows to:\n - Control FOV in game.\n - Unlock FPS.\n - Disable depth of field.\n - Disable chromatic aberrations.\n - Disable vignetting.\n - Disable FOG.\n - Enable dev console.";
const char* DONATION_URL = "https://buymeacoffee.com/k4sh44";

// Scaling factor based vertical resolution
float scale = 1.f;

// Load and unload game core dll functions /!\ necessary
static void LoadFixDLL()
{
    if (InterlockedCompareExchange(&g_coreInitialized, 1, 0) != 0)
        return;

    if (GetModuleHandleA("MGSDSECore.dll") == nullptr) {
        fixLib = LoadLibraryA("MGSDSECore.dll");

        if (!fixLib) {
            MessageBoxA(nullptr, "Impossible to load game core dll", "Erreur", MB_OK);
            return;
        }

        SetFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFixEnabled");
        SetFOVFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFOVFixEnabled");
        SetFPSFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFPSFixEnabled");
        SetDOFFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetDOFFixEnabled");
        SetCAFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetCAFixEnabled");
        SetVignettingFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetVignettingFixEnabled");
        SetFogFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFogFixEnabled");
        SetFOV = (SetIntFn)GetProcAddress(fixLib, "SetFOV");
        GetFOVIn = (GetFloatFn)GetProcAddress(fixLib, "GetFOVIn");
        GetCompensadedFOV = (GetFloatFn)GetProcAddress(fixLib, "GetCompensatedFOV");
        GetFOVOut = (GetFloatFn)GetProcAddress(fixLib, "GetFOVOut");;
        GetConsoleEnabled = (GetBoolFn)GetProcAddress(fixLib, "GetConsoleEnabled");

        // Apply initial values loaded from settings
        if (SetFOV) SetFOV(worldFOVvalue);
        if (SetFOVFixEnabled) SetFOVFixEnabled(fov_fix_enabled, true);
        if (SetFPSFixEnabled) SetFPSFixEnabled(FPS_fix_enabled, true);
        if (SetDOFFixEnabled) SetDOFFixEnabled(DOF_fix_enabled, true);
        if (SetCAFixEnabled) SetCAFixEnabled(CA_fix_enabled, true);
        if (SetVignettingFixEnabled) SetVignettingFixEnabled(Vignetting_fix_enabled, true);
        if (SetFogFixEnabled) SetFogFixEnabled(Fog_fix_enabled, true);
        if (SetFixEnabled) SetFixEnabled(fix_enabled, true);
    }
}

// Settings functions
static void SaveSettings()
{
    std::ofstream file(SETTINGS_FILE);
    if (file.is_open())
    {
        file << GENERAL_FIX_SETTING << (fix_enabled ? "1" : "0") << "\n";
        file << WORLD_FOV_FIX_SETTING << (fov_fix_enabled ? "1" : "0") << "\n";
        file << FPS_FIX_SETTING << (FPS_fix_enabled ? "1" : "0") << "\n";
        file << DOF_FIX_SETTING << (DOF_fix_enabled ? "1" : "0") << "\n";
        file << CA_FIX_SETTING << (CA_fix_enabled ? "1" : "0") << "\n";
        file << VIGNETTING_FIX_SETTING << (Vignetting_fix_enabled ? "1" : "0") << "\n";
        file << FOG_FIX_SETTING << (Fog_fix_enabled ? "1" : "0") << "\n";
        file << WORLD_FOV_SETTING << worldFOVvalue << "\n";
        file.close();
    }
}

static void LoadSettings()
{
    std::ifstream file(SETTINGS_FILE);
    if (file.is_open())
    {
        std::string line;
        while (std::getline(file, line))
        {
            if (line.find(GENERAL_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(GENERAL_FIX_SETTING));
                fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(WORLD_FOV_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(WORLD_FOV_FIX_SETTING));
                fov_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(FPS_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(FPS_FIX_SETTING));
                FPS_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(DOF_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(DOF_FIX_SETTING));
                DOF_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(CA_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(CA_FIX_SETTING));
                CA_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(VIGNETTING_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(VIGNETTING_FIX_SETTING));
                Vignetting_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(FOG_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(FOG_FIX_SETTING));
                Fog_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(WORLD_FOV_SETTING) == 0)
                worldFOVvalue = std::stoi(line.substr(strlen(WORLD_FOV_SETTING)));

        }
        file.close();
    }
}

// Initialize ImGui widgets for Reshade
static void on_overlay_draw(reshade::api::effect_runtime* runtime)
{
    ImGuiStyle& style = ImGui::GetStyle();
    style.ItemSpacing = ImVec2(8 * scale, 8 * scale);     // Spacing between widgets
    style.FramePadding = ImVec2(3 * scale, 3 * scale);    // Widgets padding
    style.WindowPadding = ImVec2(10 * scale, 10 * scale); // Overlay padding
    style.CellPadding = ImVec2(10 * scale, 10 * scale);   // Table cells padding

    ImGui::SetNextWindowSize(ImVec2(350 * scale, 150 * scale), ImGuiCond_Once);

    // Donation ?
    if (ImGui::Button("Like my work ? Consider donation")) ShellExecuteA(NULL, "open", DONATION_URL, NULL, NULL, SW_SHOWNORMAL);
    ImGui::SameLine();
    // Fix information
    if (ImGui::Button("Fix informations")) popup_Informations = true;

    if (popup_Informations)
    {
        ImGui::Begin("Informations", &popup_Informations);
        ImGui::Text("Version : %s", FIX_VERSION);
        ImGui::Text(FIX_INFORMATIONS);
        ImGui::End();
    }

    if (ImGui::BeginTable("FixesTable", 2, ImGuiTableFlags_SizingStretchSame)) {
        ImGui::TableSetupColumn("LeftFix", ImGuiTableColumnFlags_WidthStretch, 0.4f);
        ImGui::TableSetupColumn("RightFix", ImGuiTableColumnFlags_WidthStretch, 0.6f);
        ImGui::TableNextRow();

        // Drawing a left column with slider and general fix
        ImGui::TableSetColumnIndex(0);
        if (ImGui::CollapsingHeader("Enable fixes", ImGuiTreeNodeFlags_DefaultOpen))
            if (ImGui::Checkbox("Fix enabled", &fix_enabled)) {
                if (SetFixEnabled) SetFixEnabled(fix_enabled, false);
                SaveSettings();
            }

        // Sliders
        if (ImGui::CollapsingHeader("In game additional FOV", ImGuiTreeNodeFlags_DefaultOpen))
        {
            ImGui::SetNextItemWidth(150 * scale);
            if (ImGui::SliderInt("##FOVValue", &worldFOVvalue, -20, 50)) {
                if (SetFOV) SetFOV(worldFOVvalue); SaveSettings();
            }
        }

        // Individual fixes
        ImGui::TableSetColumnIndex(1);
        if (ImGui::CollapsingHeader("Individual fixes", ImGuiTreeNodeFlags_DefaultOpen)) {
            if (ImGui::BeginTable("IndividualFixesTable", 2, ImGuiTableFlags_SizingStretchSame)) {
                ImGui::TableSetupColumn("IndFix1", ImGuiTableColumnFlags_WidthStretch, 0.35f);
                ImGui::TableSetupColumn("IndFix2", ImGuiTableColumnFlags_WidthStretch, 0.65f);
                ImGui::TableNextRow();

                ImGui::TableSetColumnIndex(0);
                if (ImGui::Checkbox("FOV", &fov_fix_enabled)) {
                    if (SetFOVFixEnabled) SetFOVFixEnabled(fov_fix_enabled, false);
                    SaveSettings();
                }

                if (ImGui::Checkbox("Frame time", &FPS_fix_enabled)) {
                    if (SetFPSFixEnabled) SetFPSFixEnabled(FPS_fix_enabled, false);
                    SaveSettings();
                }

                if (ImGui::Checkbox("Fog", &Fog_fix_enabled)) {
                    if (SetFogFixEnabled) SetFogFixEnabled(Fog_fix_enabled, false);
                    SaveSettings();
                }
                if (ImGui::IsItemHovered()) {
                    ImGui::BeginTooltip();
                    ImGui::Text("Enabling this fix is a one way.");
                    ImGui::Text("Reverting it in real time would end in game crash.");
                    ImGui::Text("So disabling this fix is only possible by doing it here and restart the game.");
                    ImGui::EndTooltip();
                }

                ImGui::TableSetColumnIndex(1);
                if (ImGui::Checkbox("Depth of field", &DOF_fix_enabled)) {
                    if (SetDOFFixEnabled) SetDOFFixEnabled(DOF_fix_enabled, false);
                    SaveSettings();
                }

                if (ImGui::Checkbox("Chromatic aberrations", &CA_fix_enabled)) {
                    if (SetCAFixEnabled) SetCAFixEnabled(CA_fix_enabled, false);
                    SaveSettings();
                }

                if (ImGui::Checkbox("Vignetting", &Vignetting_fix_enabled)) {
                    if (SetVignettingFixEnabled) SetVignettingFixEnabled(Vignetting_fix_enabled, false);
                    SaveSettings();
                }
                ImGui::EndTable();
            }
        }
        ImGui::EndTable();
    }
    // Fix status
    if (ImGui::CollapsingHeader("Fix informations", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::Text("Screen width: %d, height: %d, aspect ratio: %.2f", screenWidth, screenHeight, aspectRatio);
        if (GetConsoleEnabled && GetConsoleEnabled())
            ImGui::Text("Console enabled and bound to key Tilde");
        if (GetFOVIn && GetCompensadedFOV && GetFOVOut)
            ImGui::TextColored(ImColor(48, 179, 25), "FOV In: %.2f, Compensated: %.2f, Out: %.2f", GetFOVIn(), GetCompensadedFOV(), GetFOVOut());
    }
}

// Main dll intrance
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID)
{
    switch (ul_reason_for_call)
    {
        case DLL_PROCESS_ATTACH:
            if (!reshade::register_addon(hinstDLL))
                return FALSE;
            LoadSettings();

            reshade::register_overlay("Metal Gear Solid Delta : Snake Eater", &on_overlay_draw);
            reshade::register_event<reshade::addon_event::init_effect_runtime>(
                [](reshade::api::effect_runtime* runtime) {
                    LoadFixDLL();
                });
            break;
        case DLL_PROCESS_DETACH:
            reshade::unregister_addon(hinstDLL);
            break;
    }
    return TRUE;
}