#include "EditorContext.h"

#include "Composition/EditorShellAssetBuilder.h"

#include <algorithm>
#include <sstream>
#include <utility>

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

namespace {

using ::XCEngine::UI::Editor::BuildEditorShellShortcutManager;
constexpr std::size_t kMaxConsoleEntries = 256u;

std::string ComposeStatusText(
    std::string_view status,
    std::string_view message) {
    if (status.empty()) {
        return std::string(message);
    }

    if (message.empty()) {
        return std::string(status);
    }

    return std::string(status) + ": " + std::string(message);
}

} // namespace

bool EditorContext::Initialize(const std::filesystem::path& repoRoot) {
    m_shellAsset = BuildEditorShellAsset(repoRoot);
    m_shellValidation = ValidateEditorShellAsset(m_shellAsset);
    if (!m_shellValidation.IsValid()) {
        return false;
    }

    m_session = {};
    m_session.repoRoot = repoRoot;
    m_session.projectRoot = (repoRoot / "project").lexically_normal();
    m_hostCommandBridge.BindSession(m_session);
    m_shortcutManager = BuildEditorShellShortcutManager(m_shellAsset);
    m_shortcutManager.SetHostCommandHandler(&m_hostCommandBridge);
    m_shellServices = {};
    m_shellServices.commandDispatcher = &m_shortcutManager.GetCommandDispatcher();
    m_shellServices.shortcutManager = &m_shortcutManager;
    SetReadyStatus();
    return true;
}

void EditorContext::AttachTextMeasurer(
    const UIEditorTextMeasurer& textMeasurer) {
    m_shellServices.textMeasurer = &textMeasurer;
}

void EditorContext::SetExitRequestHandler(std::function<void()> handler) {
    m_hostCommandBridge.SetExitRequestHandler(std::move(handler));
}

void EditorContext::SyncSessionFromWorkspace(
    const UIEditorWorkspaceController& workspaceController) {
    SyncEditorSessionFromWorkspace(m_session, workspaceController);
}

bool EditorContext::IsValid() const {
    return m_shellValidation.IsValid();
}

const std::string& EditorContext::GetValidationMessage() const {
    return m_shellValidation.message;
}

const EditorShellAsset& EditorContext::GetShellAsset() const {
    return m_shellAsset;
}

const EditorSession& EditorContext::GetSession() const {
    return m_session;
}

void EditorContext::SetSelection(EditorSelectionState selection) {
    m_session.selection = std::move(selection);
}

void EditorContext::ClearSelection() {
    m_session.selection = {};
}

UIEditorWorkspaceController EditorContext::BuildWorkspaceController() const {
    return UIEditorWorkspaceController(
        m_shellAsset.panelRegistry,
        m_shellAsset.workspace,
        m_shellAsset.workspaceSession);
}

const UIEditorShellInteractionServices& EditorContext::GetShellServices() const {
    return m_shellServices;
}

UIEditorShellInteractionDefinition EditorContext::BuildShellDefinition(
    const UIEditorWorkspaceController& workspaceController,
    std::string_view captureText,
    EditorShellVariant variant) const {
    return BuildEditorShellInteractionDefinition(
        m_shellAsset,
        workspaceController,
        ComposeStatusText(m_lastStatus, m_lastMessage),
        captureText,
        variant);
}

void EditorContext::SetReadyStatus() {
    SetStatus("Ready", "Old editor shell baseline loaded.");
}

void EditorContext::SetStatus(
    std::string status,
    std::string message) {
    if (m_lastStatus != status || m_lastMessage != message) {
        AppendConsoleEntry(status, message);
    }
    m_lastStatus = std::move(status);
    m_lastMessage = std::move(message);
}

void EditorContext::UpdateStatusFromShellResult(
    const UIEditorWorkspaceController& workspaceController,
    const UIEditorShellInteractionResult& result) {
    if (result.commandDispatched) {
        SetStatus(
            std::string(GetUIEditorCommandDispatchStatusName(result.commandDispatchResult.status)),
            result.commandDispatchResult.message.empty()
                ? result.commandDispatchResult.displayName
                : result.commandDispatchResult.message);
        return;
    }

    if (result.workspaceResult.dockHostResult.layoutChanged) {
        SetStatus("Layout", result.workspaceResult.dockHostResult.layoutResult.message);
        return;
    }

    if (result.workspaceResult.dockHostResult.commandExecuted) {
        SetStatus("Workspace", result.workspaceResult.dockHostResult.commandResult.message);
        return;
    }

    if (!result.viewportPanelId.empty()) {
        std::string message = {};
        if (result.viewportInputFrame.captureStarted) {
            message = "Viewport capture started.";
        } else if (result.viewportInputFrame.captureEnded) {
            message = "Viewport capture ended.";
        } else if (result.viewportInputFrame.focusGained) {
            message = "Viewport focused.";
        } else if (result.viewportInputFrame.focusLost) {
            message = "Viewport focus lost.";
        } else if (result.viewportInputFrame.pointerPressedInside) {
            message = "Viewport pointer down.";
        } else if (result.viewportInputFrame.pointerReleasedInside) {
            message = "Viewport pointer up.";
        } else if (result.viewportInputFrame.pointerMoved) {
            message = "Viewport pointer move.";
        } else if (result.viewportInputFrame.wheelDelta != 0.0f) {
            message = "Viewport wheel.";
        }

        if (!message.empty()) {
            SetStatus(result.viewportPanelId, std::move(message));
        }
        return;
    }

    if (result.menuMutation.changed) {
        if (!result.itemId.empty() && !result.menuMutation.openedPopupId.empty()) {
            SetStatus("Menu", result.itemId + " opened child popup.");
        } else if (!result.menuId.empty() && !result.menuMutation.openedPopupId.empty()) {
            SetStatus("Menu", result.menuId + " opened.");
        } else {
            SetStatus("Menu", "Popup chain dismissed.");
        }
    }
}

void EditorContext::AppendConsoleEntry(
    std::string channel,
    std::string message) {
    EditorConsoleEntry entry = {};
    entry.channel = std::move(channel);
    entry.message = std::move(message);
    m_session.consoleEntries.push_back(std::move(entry));
    if (m_session.consoleEntries.size() > kMaxConsoleEntries) {
        m_session.consoleEntries.erase(m_session.consoleEntries.begin());
    }
}

std::string EditorContext::DescribeWorkspaceState(
    const UIEditorWorkspaceController& workspaceController,
    const UIEditorShellInteractionState& interactionState) const {
    std::ostringstream stream = {};
    stream << "active=" << workspaceController.GetWorkspace().activePanelId;
    const auto visiblePanels =
        CollectUIEditorWorkspaceVisiblePanels(
            workspaceController.GetWorkspace(),
            workspaceController.GetSession());
    stream << " visible=[";
    for (std::size_t index = 0; index < visiblePanels.size(); ++index) {
        if (index > 0u) {
            stream << ',';
        }
        stream << visiblePanels[index].panelId;
    }
    stream << ']';

    const auto& dockState =
        interactionState.workspaceInteractionState.dockHostInteractionState;
    stream << " dragNode=" << dockState.activeTabDragNodeId;
    stream << " dragPanel=" << dockState.activeTabDragPanelId;
    if (dockState.dockHostState.dropPreview.visible) {
        stream << " dropTarget=" << dockState.dockHostState.dropPreview.targetNodeId;
    }
    return stream.str();
}

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