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

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

#include <XCEditor/Foundation/UIEditorRuntimeTrace.h>

#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;

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) {
            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) {
            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) {
                    PostMessageW(otherWindow->GetHwnd(), WM_CLOSE, 0, 0);
                }
            }
        }
    }
}

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;

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