#include "Platform/Win32/WindowManager/Internal.h"

#include "Bootstrap/EditorResources.h"
#include "State/EditorContext.h"
#include "Platform/Win32/EditorWindow.h"

#include <XCEditor/Foundation/UIEditorRuntimeTrace.h>

#include <algorithm>
#include <utility>

namespace XCEngine::UI::Editor::App {

EditorWindowManager::EditorWindowManager(
    EditorWindowHostConfig hostConfig,
    std::filesystem::path repoRoot,
    EditorContext& editorContext)
    : m_hostRuntime(std::make_unique<Internal::EditorWindowHostRuntime>(
          hostConfig,
          std::move(repoRoot),
          editorContext)) {
    m_workspaceCoordinator =
        std::make_unique<Internal::EditorWindowWorkspaceCoordinator>(*m_hostRuntime);
}

EditorWindowManager::~EditorWindowManager() = default;

EditorWindow* EditorWindowManager::CreateEditorWindow(
    UIEditorWorkspaceController workspaceController,
    const CreateParams& params) {
    return m_hostRuntime->CreateEditorWindow(std::move(workspaceController), params);
}

void EditorWindowManager::HandlePendingNativeWindowCreated(HWND hwnd) {
    m_hostRuntime->HandlePendingNativeWindowCreated(hwnd);
}

void EditorWindowManager::Shutdown() {
    m_workspaceCoordinator->EndGlobalTabDragSession();
    m_hostRuntime->Shutdown();
}

EditorWindow* EditorWindowManager::FindWindow(HWND hwnd) {
    return m_hostRuntime->FindWindow(hwnd);
}

const EditorWindow* EditorWindowManager::FindWindow(HWND hwnd) const {
    return m_hostRuntime->FindWindow(hwnd);
}

EditorWindow* EditorWindowManager::FindWindow(std::string_view windowId) {
    return m_hostRuntime->FindWindow(windowId);
}

const EditorWindow* EditorWindowManager::FindWindow(std::string_view windowId) const {
    return m_hostRuntime->FindWindow(windowId);
}

EditorWindow* EditorWindowManager::FindPrimaryWindow() {
    return m_hostRuntime->FindPrimaryWindow();
}

const EditorWindow* EditorWindowManager::FindPrimaryWindow() const {
    return m_hostRuntime->FindPrimaryWindow();
}

bool EditorWindowManager::HasWindows() const {
    return m_hostRuntime->HasWindows();
}

void EditorWindowManager::DestroyClosedWindows() {
    m_hostRuntime->DestroyClosedWindows();
}

void EditorWindowManager::RenderAllWindows() {
    m_hostRuntime->RenderAllWindows(
        m_workspaceCoordinator->IsGlobalTabDragActive(),
        *m_workspaceCoordinator);
}

bool EditorWindowManager::IsGlobalTabDragActive() const {
    return m_workspaceCoordinator->IsGlobalTabDragActive();
}

bool EditorWindowManager::OwnsActiveGlobalTabDrag(std::string_view windowId) const {
    return m_workspaceCoordinator->OwnsActiveGlobalTabDrag(windowId);
}

void EditorWindowManager::EndGlobalTabDragSession() {
    m_workspaceCoordinator->EndGlobalTabDragSession();
}

void EditorWindowManager::HandleDestroyedWindow(HWND hwnd) {
    m_hostRuntime->HandleDestroyedWindow(hwnd);
}

void EditorWindowManager::HandleWindowFrameTransferRequests(
    EditorWindow& sourceWindow,
    EditorWindowFrameTransferRequests&& transferRequests) {
    m_workspaceCoordinator->HandleWindowFrameTransferRequests(
        sourceWindow,
        std::move(transferRequests));
}

bool EditorWindowManager::HandleGlobalTabDragPointerMove(HWND hwnd) {
    return m_workspaceCoordinator->HandleGlobalTabDragPointerMove(hwnd);
}

bool EditorWindowManager::HandleGlobalTabDragPointerButtonUp(HWND hwnd) {
    return m_workspaceCoordinator->HandleGlobalTabDragPointerButtonUp(hwnd);
}

} // namespace XCEngine::UI::Editor::App

namespace XCEngine::UI::Editor::App::Internal {

EditorWindowHostRuntime::EditorWindowHostRuntime(
    EditorWindowHostConfig hostConfig,
    std::filesystem::path repoRoot,
    EditorContext& editorContext)
    : m_hostConfig(hostConfig),
      m_repoRoot(std::move(repoRoot)),
      m_editorContext(editorContext) {}

EditorWindowHostRuntime::~EditorWindowHostRuntime() = default;

EditorWindow* EditorWindowHostRuntime::CreateEditorWindow(
    UIEditorWorkspaceController workspaceController,
    const CreateParams& params) {
    auto windowPtr = std::make_unique<EditorWindow>(
        params.windowId,
        params.title.empty() ? std::wstring(L"XCEngine Editor") : params.title,
        params.primary,
        std::move(workspaceController));
    EditorWindow* const rawWindow = windowPtr.get();
    m_windows.push_back(std::move(windowPtr));

    const auto eraseRawWindow = [this, rawWindow]() {
        const auto it = std::find_if(
            m_windows.begin(),
            m_windows.end(),
            [rawWindow](const std::unique_ptr<EditorWindow>& candidate) {
                return candidate.get() == rawWindow;
            });
        if (it != m_windows.end()) {
            m_windows.erase(it);
        }
    };

    m_pendingCreateWindow = rawWindow;
    const HWND hwnd = CreateWindowExW(
        WS_EX_APPWINDOW,
        m_hostConfig.windowClassName,
        rawWindow->GetTitle().c_str(),
        m_hostConfig.windowStyle,
        params.initialX,
        params.initialY,
        params.initialWidth,
        params.initialHeight,
        nullptr,
        nullptr,
        m_hostConfig.hInstance,
        m_hostConfig.windowUserData);
    m_pendingCreateWindow = nullptr;
    if (hwnd == nullptr) {
        eraseRawWindow();
        return nullptr;
    }

    if (!rawWindow->HasHwnd()) {
        rawWindow->AttachHwnd(hwnd);
    }

    auto failWindowInitialization = [&](std::string_view message) {
        LogRuntimeTrace("window", std::string(message));
        DestroyEditorWindow(*rawWindow);
        eraseRawWindow();
        return static_cast<EditorWindow*>(nullptr);
    };

    const HICON bigIcon = static_cast<HICON>(
        LoadImageW(
            m_hostConfig.hInstance,
            MAKEINTRESOURCEW(IDI_APP_ICON),
            IMAGE_ICON,
            0,
            0,
            LR_DEFAULTSIZE));
    const HICON smallIcon = static_cast<HICON>(
        LoadImageW(
            m_hostConfig.hInstance,
            MAKEINTRESOURCEW(IDI_APP_ICON_SMALL),
            IMAGE_ICON,
            GetSystemMetrics(SM_CXSMICON),
            GetSystemMetrics(SM_CYSMICON),
            LR_DEFAULTCOLOR));
    if (bigIcon != nullptr) {
        SendMessageW(hwnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(bigIcon));
    }
    if (smallIcon != nullptr) {
        SendMessageW(hwnd, WM_SETICON, ICON_SMALL, reinterpret_cast<LPARAM>(smallIcon));
    }

    if (!rawWindow->Initialize(
            m_repoRoot,
            m_editorContext,
            m_editorContext.GetShellAsset().captureRootPath,
            params.autoCaptureOnStartup)) {
        return failWindowInitialization("managed window initialization failed");
    }

    ShowWindow(hwnd, params.showCommand);
    UpdateWindow(hwnd);
    return rawWindow;
}

void EditorWindowHostRuntime::HandlePendingNativeWindowCreated(HWND hwnd) {
    if (m_pendingCreateWindow != nullptr && !m_pendingCreateWindow->HasHwnd()) {
        m_pendingCreateWindow->AttachHwnd(hwnd);
    }
}

void EditorWindowHostRuntime::Shutdown() {
    for (const std::unique_ptr<EditorWindow>& window : m_windows) {
        if (window != nullptr) {
            DestroyEditorWindow(*window);
        }
    }
    m_windows.clear();
    m_pendingCreateWindow = nullptr;
}

bool EditorWindowHostRuntime::HasWindows() const {
    return !m_windows.empty();
}

void EditorWindowHostRuntime::DestroyEditorWindow(EditorWindow& window) {
    const HWND hwnd = window.GetHwnd();
    if (GetCapture() == hwnd) {
        ReleaseCapture();
    }

    window.Shutdown();
    if (hwnd != nullptr && IsWindow(hwnd)) {
        DestroyWindow(hwnd);
    }
    window.MarkDestroyed();
}

void EditorWindowHostRuntime::DestroyClosedWindows() {
    for (auto it = m_windows.begin(); it != m_windows.end();) {
        EditorWindow* const window = it->get();
        if (window == nullptr || window->GetHwnd() != nullptr) {
            ++it;
            continue;
        }

        if (m_pendingCreateWindow == window) {
            m_pendingCreateWindow = nullptr;
        }

        window->Shutdown();
        it = m_windows.erase(it);
    }
}

void EditorWindowHostRuntime::RenderAllWindows(
    bool globalTabDragActive,
    EditorWindowWorkspaceCoordinator& workspaceCoordinator) {
    struct WindowFrameTransferBatch {
        EditorWindow* sourceWindow = nullptr;
        EditorWindowFrameTransferRequests requests = {};
    };

    std::vector<WindowFrameTransferBatch> transferBatches = {};
    transferBatches.reserve(m_windows.size());

    for (const std::unique_ptr<EditorWindow>& window : m_windows) {
        if (window == nullptr ||
            window->GetHwnd() == nullptr ||
            window->IsClosing()) {
            continue;
        }

        EditorWindowFrameTransferRequests transferRequests =
            window->RenderFrame(m_editorContext, globalTabDragActive);
        if (!transferRequests.HasPendingRequests()) {
            continue;
        }

        transferBatches.push_back(WindowFrameTransferBatch{
            window.get(),
            std::move(transferRequests),
        });
    }

    for (WindowFrameTransferBatch& batch : transferBatches) {
        if (batch.sourceWindow == nullptr ||
            batch.sourceWindow->GetHwnd() == nullptr ||
            batch.sourceWindow->IsClosing()) {
            continue;
        }

        workspaceCoordinator.HandleWindowFrameTransferRequests(
            *batch.sourceWindow,
            std::move(batch.requests));
    }
}

void EditorWindowHostRuntime::HandleDestroyedWindow(HWND hwnd) {
    if (EditorWindow* window = FindWindow(hwnd); window != nullptr) {
        window->MarkDestroyed();
        if (window->IsPrimary()) {
            for (const std::unique_ptr<EditorWindow>& otherWindow : m_windows) {
                if (otherWindow != nullptr &&
                    otherWindow.get() != window &&
                    otherWindow->GetHwnd() != nullptr &&
                    !otherWindow->IsClosing()) {
                    otherWindow->MarkClosing();
                    PostMessageW(otherWindow->GetHwnd(), WM_CLOSE, 0, 0);
                }
            }
        }
    }
}

EditorWindow* EditorWindowHostRuntime::FindWindow(HWND hwnd) {
    if (hwnd == nullptr) {
        return nullptr;
    }

    for (const std::unique_ptr<EditorWindow>& window : m_windows) {
        if (window != nullptr && window->GetHwnd() == hwnd) {
            return window.get();
        }
    }

    return nullptr;
}

const EditorWindow* EditorWindowHostRuntime::FindWindow(HWND hwnd) const {
    return const_cast<EditorWindowHostRuntime*>(this)->FindWindow(hwnd);
}

EditorWindow* EditorWindowHostRuntime::FindWindow(std::string_view windowId) {
    if (windowId.empty()) {
        return nullptr;
    }

    for (const std::unique_ptr<EditorWindow>& window : m_windows) {
        if (window != nullptr && window->GetWindowId() == windowId) {
            return window.get();
        }
    }

    return nullptr;
}

const EditorWindow* EditorWindowHostRuntime::FindWindow(std::string_view windowId) const {
    return const_cast<EditorWindowHostRuntime*>(this)->FindWindow(windowId);
}

EditorWindow* EditorWindowHostRuntime::FindPrimaryWindow() {
    for (const std::unique_ptr<EditorWindow>& window : m_windows) {
        if (window != nullptr && window->IsPrimary()) {
            return window.get();
        }
    }

    return nullptr;
}

const EditorWindow* EditorWindowHostRuntime::FindPrimaryWindow() const {
    return const_cast<EditorWindowHostRuntime*>(this)->FindPrimaryWindow();
}

void EditorWindowHostRuntime::LogRuntimeTrace(
    std::string_view channel,
    std::string_view message) const {
    AppendUIEditorRuntimeTrace(channel, message);
}

EditorWindowWorkspaceCoordinator::EditorWindowWorkspaceCoordinator(
    EditorWindowHostRuntime& hostRuntime)
    : m_hostRuntime(hostRuntime) {}

EditorWindowWorkspaceCoordinator::~EditorWindowWorkspaceCoordinator() = default;

UIEditorWindowWorkspaceSet EditorWindowWorkspaceCoordinator::BuildWindowWorkspaceSet(
    std::string_view activeWindowId) const {
    UIEditorWindowWorkspaceSet windowSet = {};
    if (const EditorWindow* primaryWindow = m_hostRuntime.FindPrimaryWindow();
        primaryWindow != nullptr &&
        primaryWindow->GetHwnd() != nullptr &&
        !primaryWindow->IsClosing()) {
        windowSet.primaryWindowId = std::string(primaryWindow->GetWindowId());
    }

    for (const std::unique_ptr<EditorWindow>& window : m_hostRuntime.GetWindows()) {
        if (window == nullptr ||
            window->GetHwnd() == nullptr ||
            window->IsClosing()) {
            continue;
        }

        UIEditorWindowWorkspaceState entry = {};
        entry.windowId = std::string(window->GetWindowId());
        entry.workspace = window->GetWorkspaceController().GetWorkspace();
        entry.session = window->GetWorkspaceController().GetSession();
        windowSet.windows.push_back(std::move(entry));
    }

    windowSet.activeWindowId =
        !activeWindowId.empty() &&
            ([this, activeWindowId]() {
                const EditorWindow* activeWindow = m_hostRuntime.FindWindow(activeWindowId);
                return activeWindow != nullptr &&
                    activeWindow->GetHwnd() != nullptr &&
                    !activeWindow->IsClosing();
            })()
        ? std::string(activeWindowId)
        : windowSet.primaryWindowId;

    return windowSet;
}

UIEditorWindowWorkspaceController
EditorWindowWorkspaceCoordinator::BuildLiveWindowWorkspaceController(
    std::string_view activeWindowId) const {
    return UIEditorWindowWorkspaceController(
        m_hostRuntime.GetEditorContext().GetShellAsset().panelRegistry,
        BuildWindowWorkspaceSet(activeWindowId));
}

UIEditorWorkspaceController EditorWindowWorkspaceCoordinator::BuildWorkspaceControllerForWindow(
    const UIEditorWindowWorkspaceState& windowState) const {
    return UIEditorWorkspaceController(
        m_hostRuntime.GetEditorContext().GetShellAsset().panelRegistry,
        windowState.workspace,
        windowState.session);
}

void EditorWindowWorkspaceCoordinator::HandleWindowFrameTransferRequests(
    EditorWindow& sourceWindow,
    EditorWindowFrameTransferRequests&& transferRequests) {
    if (!m_globalTabDragSession.active &&
        transferRequests.beginGlobalTabDrag.has_value() &&
        transferRequests.beginGlobalTabDrag->IsValid()) {
        TryStartGlobalTabDrag(sourceWindow, *transferRequests.beginGlobalTabDrag);
    }

    if (!m_globalTabDragSession.active &&
        transferRequests.detachPanel.has_value() &&
        transferRequests.detachPanel->IsValid()) {
        TryProcessDetachRequest(sourceWindow, *transferRequests.detachPanel);
    }
}

} // namespace XCEngine::UI::Editor::App::Internal