#define IMGUI_DISABLE_INCLUDE_IMCONFIG_H
#define IMGUI_HAS_DOCK 1

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

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

static HMODULE fixLib = nullptr;
static SetBoolFn SetFixEnabled = nullptr;
static SetBoolFn SetFOVFixEnabled = nullptr;
static SetBoolFn SetAspectRatioFixEnabled = nullptr;
static SetBoolFn SetDOFFixEnabled = nullptr;
static SetBoolFn SetVignettingFixEnabled = nullptr;
static SetBoolFn SetFogFixEnabled = nullptr;
static InitDLL InitializeLogger = nullptr;
static SetIntFn SetFOV = nullptr;
static GetFloatFn GetFOVIn = nullptr;
static GetFloatFn GetCompensadedFOV = nullptr;
static GetFloatFn GetFOVOut = nullptr;

// Plugin variables for checkboxes and sliders
static bool fov_fix_enabled = false;
static bool aspect_ratio_fix_enabled = false;
static bool DOF_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* FOV_FIX_SETTING = "FOVFIX=";
const char* ASPECT_FIX_SETTING = "AspectFIX=";
const char* DOF_FIX_SETTING = "DOFFIX=";
const char* VIGNETTING_FIX_SETTING = "VignettingFIX=";
const char* FOG_FIX_SETTING = "FogFIX=";
const char* WORLD_FOV_SETTING = "WorldFOV=";
const char* FIX_VERSION = "1.0.2";
const char* FIX_INFORMATIONS = "This fix allows to:\n - Control FOV.\n - Disable pillarboxing in cutscenes.\n - Disable depth of field.\n - Disable vignetting.\n - Disable fog.\n\nDisabling pillarboxing will compensate FOV for ultrawide.\nDisabling Fog will not entirely remove it.";
const char* DONATION_URL = "https://buymeacoffee.com/k4sh44";

// Ensure that our Core DLL will be called only once
bool IsAlreadyInitialized()
{
    // Declare a lock
    HANDLE hMap = OpenFileMappingA(FILE_MAP_ALL_ACCESS, FALSE, "Local\\WuchangFixSharedSection");

    // If lock is not yet initialized
    if (hMap == nullptr)
    {
        // We create the lock only once
        hMap = CreateFileMappingA(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, 1, "Local\\WuchangFixSharedSection");

        if (hMap == nullptr) // We ensure the lock is valid
            return true;

        return false; // First time created we return false
    }

    // Otherwise we return true
    CloseHandle(hMap);
    return true;
}

// Load and unload game core dll functions /!\ necessary
static void LoadFixDLL()
{
    if (IsAlreadyInitialized())
        return; // déjà lancé dans un autre chargement

    std::thread([]() {
        // Game process is not ready at launch and memory is not yet initialized
        // We do want the core dll to be called and initialized a few seconds after game launch
        std::this_thread::sleep_for(std::chrono::milliseconds(6000));

        if (GetModuleHandleA("WuchangFFCore.dll") == nullptr) {
            fixLib = LoadLibraryA("WuchangFFCore.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");
            SetAspectRatioFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetAspectRatioFixEnabled");
            SetDOFFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetDOFFixEnabled");
            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");;

            // Apply initial values loaded from settings
            if (SetFOV) SetFOV(worldFOVvalue);
            if (SetFOVFixEnabled) SetFOVFixEnabled(fov_fix_enabled, true);
            if (SetAspectRatioFixEnabled) SetAspectRatioFixEnabled(aspect_ratio_fix_enabled, true);
            if (SetDOFFixEnabled) SetDOFFixEnabled(DOF_fix_enabled, true);
            if (SetVignettingFixEnabled) SetVignettingFixEnabled(Vignetting_fix_enabled, true);
            if (SetFogFixEnabled) SetFogFixEnabled(Fog_fix_enabled, true);
            if (SetFixEnabled) SetFixEnabled(fix_enabled, true);
        }
    }).detach(); // This thread will not block others
}

// Addon functions
static void SaveSettings()
{
    std::ofstream file(SETTINGS_FILE);
    if (file.is_open())
    {
        file << GENERAL_FIX_SETTING << (fix_enabled ? "1" : "0") << "\n";
        file << FOV_FIX_SETTING << (fov_fix_enabled ? "1" : "0") << "\n";
        file << ASPECT_FIX_SETTING << (aspect_ratio_fix_enabled ? "1" : "0") << "\n";
        file << DOF_FIX_SETTING << (DOF_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(FOV_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(FOV_FIX_SETTING));
                fov_fix_enabled = (val == "1" || val == "true");
            }
            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(ASPECT_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(ASPECT_FIX_SETTING));
                aspect_ratio_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(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();
    }
}

static void displayFixInformations() {
    // Fix version
    ImGui::SetNextWindowSize(ImVec2(420, 210), ImGuiCond_Once);
    ImGui::Begin("Informations", &popup_Informations); //
    ImGui::SetCursorPos(ImVec2(10, 36));
    ImGui::Text("Version : %s", FIX_VERSION);
    ImGui::SetCursorPos(ImVec2(10, 76));
    ImGui::Text(FIX_INFORMATIONS);
    ImGui::End();
}

// Initialize ImGui widgets for Reshade
static void on_overlay_draw(reshade::api::effect_runtime* runtime)
{
    ImGui::SetNextWindowPos(ImVec2(100, 200), ImGuiCond_Once);
    ImGui::SetNextWindowSize(ImVec2(350, 150), ImGuiCond_Once);

    // Donation ?
    ImGui::SetCursorPos(ImVec2(10, 36));
    ImGui::Text("Like my work ?");
    ImGui::SetCursorPos(ImVec2(130, 33));
    if (ImGui::Button("consider donation"))
    {
        ShellExecuteA(NULL, "open", DONATION_URL, NULL, NULL, SW_SHOWNORMAL);
    }

    // Fix informations
    ImGui::SetCursorPos(ImVec2(270, 33));
    if (ImGui::Button("Fix informations"))
        popup_Informations = true;

    if (popup_Informations)
        displayFixInformations();

    // Generic fix
    ImGui::SetCursorPos(ImVec2(10, 60));
    ImGui::BeginChild("AllFixesHeader", ImVec2(220, 0), false); // true = border
    if (ImGui::CollapsingHeader("Enable fixes", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        if (ImGui::Checkbox("Fix enabled", &fix_enabled)) {
            if (SetFixEnabled) SetFixEnabled(fix_enabled, false);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // FOV adjustment
    ImGui::SetCursorPos(ImVec2(10, 120));
    ImGui::BeginChild("FOVHeader", ImVec2(220, 0), false); // true = bordure
    if (ImGui::CollapsingHeader("In game additional FOV", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        ImGui::SetNextItemWidth(150.0f);
        if (ImGui::SliderInt("", &worldFOVvalue, -20, 50)) {}
        if (ImGui::IsItemDeactivatedAfterEdit()) {
            if (SetFOV) SetFOV(worldFOVvalue);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // Individual fixes
    ImGui::SetCursorPos(ImVec2(240, 60));
    ImGui::BeginChild("IndividualFixesHeader", ImVec2(250, 0), false);
    if (ImGui::CollapsingHeader("Individual fixes", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        if (ImGui::Checkbox("Enable FOV fix", &fov_fix_enabled)) {
            if (SetFOVFixEnabled) SetFOVFixEnabled(fov_fix_enabled, false);
            SaveSettings();
        }

        ImGui::SetCursorPos(ImVec2(5, 55));
        if (ImGui::Checkbox("Enable aspect fix", &aspect_ratio_fix_enabled)) {
            if (SetAspectRatioFixEnabled) SetAspectRatioFixEnabled(aspect_ratio_fix_enabled, false);
            SaveSettings();
        }

        if (ImGui::IsItemHovered()) {
            ImGui::BeginTooltip();
            ImGui::Text("Aspect ratio fix is only usefull for ultrawide displays.");
            ImGui::Text("No need to enable it if you play at 16/9.");
            ImGui::EndTooltip();
        }

        ImGui::SetCursorPos(ImVec2(5, 80));
        if (ImGui::Checkbox("Depth of field Fix", &DOF_fix_enabled)) {
            if (SetDOFFixEnabled) SetDOFFixEnabled(DOF_fix_enabled, false);
            SaveSettings();
        }

        ImGui::SetCursorPos(ImVec2(5, 105));
        if (ImGui::Checkbox("Vignetting Fix", &Vignetting_fix_enabled)) {
            if (SetVignettingFixEnabled) SetVignettingFixEnabled(Vignetting_fix_enabled, false);
            SaveSettings();
        }

        ImGui::SetCursorPos(ImVec2(145, 105));
        if (ImGui::Checkbox("Fog Fix", &Fog_fix_enabled)) {
            if (SetFogFixEnabled) SetFogFixEnabled(Fog_fix_enabled, false);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // Fix status
    ImGui::SetCursorPos(ImVec2(10, 220));
    ImGui::BeginChild("INFOSHeader", ImVec2(480, 80), true); // true = border
    if (ImGui::CollapsingHeader("Fix informations", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        if (GetFOVIn && GetCompensadedFOV && GetFOVOut)
            ImGui::Text("FOV In: %.2f, Compensated : %.2f, Out : %.2f", GetFOVIn(), GetCompensadedFOV(), GetFOVOut());
    }
    ImGui::EndChild();
}

// 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("Wuchang Fallen Feathers", &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;
}