#define IMGUI_DISABLE_INCLUDE_IMCONFIG_H
#define IMGUI_HAS_DOCK 1

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

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

static HMODULE fixLib = nullptr;
static SetBoolFn SetFixEnabled = nullptr;
static SetBoolFn SetFOVFixEnabled = nullptr;
static SetBoolFn SetCameraFixEnabled = nullptr;
static SetBoolFn SetSharpnessFixEnabled = nullptr;
static SetIntFn SetFOV = nullptr;
static SetFloatFn SetCamera = nullptr;
static SetFloatFn SetSharpness = nullptr;
static GetFloatFn GetFOVIn = nullptr;
static GetFloatFn GetFOVOut = nullptr;

// Plugin variables for checkboxes and sliders
static bool fix_enabled = false;
static bool fov_fix_enabled = false;
static bool camera_fix_enabled = false;
static bool sharpness_fix_enabled = false;
static int worldFOVvalue = 0;
static float cameraDistancevalue = 0;
static float sharpnessvalue = 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* CAMERA_FIX_SETTING = "CameraFIX=";
const char* SHARPNESS_FIX_SETTING = "SharpnessFIX=";
const char* WORLD_FOV_SETTING = "WorldFOV=";
const char* CAMERA_SETTING = "Camera=";
const char* SHARPNESS_SETTING = "Sharpness=";
const char* FIX_VERSION = "1.0.2";
const char* FIX_INFORMATIONS = "This fix allows to:\r\n - Control in game FOV.\r\n - Control camera distance.\r\n - Disable image sharpening.\r\n\r\nModifying FOV may affect performance.\r\nSharpening, when set to 0 in game still applies some slight effect to images.\r\nSet the slider to 0 to completely deactivate it.\r\nA good range result would be between 0-1.\r\nCamera distance in settings is a scale between 0.9 - 1.1 (-5 to +5 slider).";
const char* DONATION_URL = "https://buymeacoffee.com/k4sh44";

// Load and unload game core dll functions /!\ necessary
static void LoadFixDLL()
{
    if (fixLib) return;
    fixLib = LoadLibraryA("TLOU2Core.dll");

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

    SetFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFixEnabled");
    SetFOVFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetFOVFixEnabled");
    SetCameraFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetCameraFixEnabled");
    SetSharpnessFixEnabled = (SetBoolFn)GetProcAddress(fixLib, "SetSharpnessFixEnabled");
    SetFOV = (SetIntFn)GetProcAddress(fixLib, "SetFOV");
    SetCamera = (SetFloatFn)GetProcAddress(fixLib, "SetCamera");
    SetSharpness = (SetFloatFn)GetProcAddress(fixLib, "SetSharpness");
    GetFOVIn = (GetFloatFn)GetProcAddress(fixLib, "GetFOVIn");
    GetFOVOut = (GetFloatFn)GetProcAddress(fixLib, "GetFOVOut");;

    // Apply initial values loaded from ini settings
    if (SetFOV) SetFOV(worldFOVvalue);
    if (SetCamera) SetCamera(cameraDistancevalue);
    if (SetSharpness) SetSharpness(sharpnessvalue);
    if (SetFOVFixEnabled) SetFOVFixEnabled(fov_fix_enabled, true);
    if (SetCameraFixEnabled) SetCameraFixEnabled(camera_fix_enabled, true);
    if (SetSharpnessFixEnabled) SetSharpnessFixEnabled(sharpness_fix_enabled, true);
    if (SetFixEnabled) SetFixEnabled(fix_enabled, true);
}

// Save settings to ini file
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 << CAMERA_FIX_SETTING << (camera_fix_enabled ? "1" : "0") << "\n";
        file << SHARPNESS_FIX_SETTING << (sharpness_fix_enabled ? "1" : "0") << "\n";
        file << WORLD_FOV_SETTING << worldFOVvalue << "\n";
        file << CAMERA_SETTING << cameraDistancevalue << "\n";
        file << SHARPNESS_SETTING << sharpnessvalue << "\n";

        file.close();
    }
}

// Load settings from ini file
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(CAMERA_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(CAMERA_FIX_SETTING));
                camera_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(SHARPNESS_FIX_SETTING) == 0)
            {
                std::string val = line.substr(strlen(SHARPNESS_FIX_SETTING));
                sharpness_fix_enabled = (val == "1" || val == "true");
            }
            else if (line.find(WORLD_FOV_SETTING) == 0)
                worldFOVvalue = std::stoi(line.substr(strlen(WORLD_FOV_SETTING)));
            else if (line.find(CAMERA_SETTING) == 0)
                cameraDistancevalue = std::stof(line.substr(strlen(CAMERA_SETTING)));
            else if (line.find(SHARPNESS_SETTING) == 0)
                sharpnessvalue = std::stof(line.substr(strlen(SHARPNESS_SETTING)));
        }
        file.close();
    }
}

static void displayFixInformations() {
    // Fix version
    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);
    if (ImGui::CollapsingHeader("In game additional FOV", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        ImGui::SetNextItemWidth(150.0f);
        if (ImGui::SliderInt("##FOVSlider", &worldFOVvalue, -20, 50)) {}
        if (ImGui::IsItemDeactivatedAfterEdit()) {
            if (SetFOV) SetFOV(worldFOVvalue);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // Camera distance adjustment
    ImGui::SetCursorPos(ImVec2(10, 200));
    ImGui::BeginChild("CAMERAHeader", ImVec2(220, 0), false);
    if (ImGui::CollapsingHeader("Camera distance", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        ImGui::SetNextItemWidth(150.0f);
        if (ImGui::SliderFloat("##CAMERASlider", &cameraDistancevalue, 0, 3)) {}
        if (ImGui::IsItemDeactivatedAfterEdit()) {
            if (SetCamera) SetCamera(cameraDistancevalue);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // Sharpness adjustment
    ImGui::SetCursorPos(ImVec2(10, 280));
    ImGui::BeginChild("SHARPNESSHeader", ImVec2(220, 0), false);
    if (ImGui::CollapsingHeader("Sharpness", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        ImGui::SetNextItemWidth(150.0f);
        if (ImGui::SliderFloat("##SHARPNESSSlider", &sharpnessvalue, 0, 3)) {}
        if (ImGui::IsItemDeactivatedAfterEdit()) {
            if (SetSharpness) SetSharpness(sharpnessvalue);
            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 camera Fix", &camera_fix_enabled)) {
            if (SetCameraFixEnabled) SetCameraFixEnabled(camera_fix_enabled, false);
            SaveSettings();
        }

        ImGui::SetCursorPos(ImVec2(5, 80));
        if (ImGui::Checkbox("Enable sharpness Fix", &sharpness_fix_enabled)) {
            if (SetSharpnessFixEnabled) SetSharpnessFixEnabled(sharpness_fix_enabled, false);
            SaveSettings();
        }
    }
    ImGui::EndChild();

    // Fix status
    ImGui::SetCursorPos(ImVec2(10, 350));
    ImGui::BeginChild("INFOSHeader", ImVec2(480, 80), true);
    if (ImGui::CollapsingHeader("Fix informations", ImGuiTreeNodeFlags_DefaultOpen)) {
        ImGui::SetCursorPos(ImVec2(5, 30));
        ImGui::Text("FOV In: %.2f, Out : %.2f", GetFOVIn(), 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("The Last Of Us : Part II", &on_overlay_draw);
        reshade::register_event<reshade::addon_event::init_effect_runtime>(
            [](reshade::api::effect_runtime* runtime) {
                LoadFixDLL();
            });
        break;
    case DLL_PROCESS_DETACH:
        fixLib = nullptr;
        reshade::unregister_addon(hinstDLL);
        break;
    }
    return TRUE;

}