#include "Application.h"
#include "Core/EditorLoggingSetup.h"
#include "Core/EditorWindowTitle.h"
#include "Layers/EditorLayer.h"
#include "Core/EditorContext.h"
#include "Core/EditorEvents.h"
#include "Core/EventBus.h"
#include "Platform/Win32Utf8.h"
#include "Platform/WindowsProcessDiagnostics.h"
#include <windows.h>

namespace XCEngine {
namespace Editor {

Application& Application::Get() {
    static Application instance;
    return instance;
}

bool Application::InitializeWindowRenderer(HWND hwnd) {
    if (m_windowRenderer.Initialize(hwnd, 1280, 720)) {
        return true;
    }

    MessageBoxW(hwnd, L"Failed to create D3D12 device", L"Error", MB_OK | MB_ICONERROR);
    return false;
}

void Application::InitializeEditorContext(const std::string& projectPath) {
    m_editorContext = std::make_shared<EditorContext>();
    m_editorContext->SetProjectPath(projectPath);
    m_exitRequestedHandlerId = m_editorContext->GetEventBus().Subscribe<EditorExitRequestedEvent>(
        [this](const EditorExitRequestedEvent&) {
            if (m_hwnd) {
                PostMessageW(m_hwnd, WM_CLOSE, 0, 0);
            }
        });
}

void Application::InitializeImGui(HWND hwnd) {
    m_imguiSession.Initialize(m_editorContext->GetProjectPath());
    m_imguiBackend.Initialize(hwnd, m_windowRenderer.GetDevice(), m_windowRenderer.GetSrvHeap());
}

void Application::AttachEditorLayer() {
    m_editorLayer = new EditorLayer();
    m_editorLayer->SetContext(m_editorContext);
    m_layerStack.pushLayer(std::unique_ptr<Core::Layer>(m_editorLayer));
    m_layerStack.onAttach();
}

void Application::DetachEditorLayer() {
    m_layerStack.onDetach();
    m_editorLayer = nullptr;
}

void Application::ShutdownEditorContext() {
    if (m_editorContext && m_exitRequestedHandlerId) {
        m_editorContext->GetEventBus().Unsubscribe<EditorExitRequestedEvent>(m_exitRequestedHandlerId);
        m_exitRequestedHandlerId = 0;
    }

    m_editorContext.reset();
}

void Application::RenderEditorFrame() {
    static constexpr float kClearColor[4] = { 0.22f, 0.22f, 0.22f, 1.0f };

    m_imguiBackend.BeginFrame();
    m_layerStack.onImGuiRender();
    UpdateWindowTitle();
    ImGui::Render();
    m_windowRenderer.Render(m_imguiBackend, kClearColor);
}

bool Application::Initialize(HWND hwnd) {
    Platform::InstallCrashExceptionFilter();
    Platform::RedirectStderrToExecutableLog();

    const std::string exeDir = Platform::GetExecutableDirectoryUtf8();
    ConfigureEditorLogging(exeDir);

    m_hwnd = hwnd;

    if (!InitializeWindowRenderer(hwnd)) {
        return false;
    }

    InitializeEditorContext(exeDir);
    InitializeImGui(hwnd);
    AttachEditorLayer();
    return true;
}

void Application::Shutdown() {
    DetachEditorLayer();
    m_imguiBackend.Shutdown();
    m_imguiSession.Shutdown();
    ShutdownEditorContext();
    m_windowRenderer.Shutdown();
}

void Application::Render() {
    RenderEditorFrame();
}

void Application::UpdateWindowTitle() {
    if (!m_hwnd || !m_editorContext) {
        return;
    }

    const std::wstring title = Platform::Utf8ToWide(BuildEditorWindowTitle(*m_editorContext));
    if (title != m_lastWindowTitle) {
        SetWindowTextW(m_hwnd, title.c_str());
        m_lastWindowTitle = title;
    }
}

void Application::OnResize(int width, int height) {
    m_windowRenderer.Resize(width, height);
}

}
}