#include "Windowing/Frame/EditorWindowFrameOrchestrator.h"

#include "Composition/EditorContext.h"
#include "Composition/EditorShellRuntime.h"
#include "Composition/EditorShellVariant.h"
#include "Windowing/EditorWindowShared.h"

#include <XCEditor/Foundation/UIEditorRuntimeTrace.h>
#include <XCEditor/Workspace/UIEditorWorkspaceController.h>
#include <XCEngine/UI/DrawData.h>

#include <sstream>

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

using ::XCEngine::UI::UIDrawData;
using ::XCEngine::UI::UIDrawList;
using ::XCEngine::UI::UIInputEvent;
using ::XCEngine::UI::UIInputEventType;
using ::XCEngine::UI::UIPoint;

namespace {

bool IsVerboseRuntimeTraceEnabled() {
    static const bool s_enabled = IsEditorWindowVerboseRuntimeTraceEnabled();
    return s_enabled;
}

std::string DescribeInputEventType(const UIInputEvent& event) {
    switch (event.type) {
    case UIInputEventType::PointerMove: return "PointerMove";
    case UIInputEventType::PointerEnter: return "PointerEnter";
    case UIInputEventType::PointerLeave: return "PointerLeave";
    case UIInputEventType::PointerButtonDown: return "PointerDown";
    case UIInputEventType::PointerButtonUp: return "PointerUp";
    case UIInputEventType::PointerWheel: return "PointerWheel";
    case UIInputEventType::KeyDown: return "KeyDown";
    case UIInputEventType::KeyUp: return "KeyUp";
    case UIInputEventType::Character: return "Character";
    case UIInputEventType::FocusGained: return "FocusGained";
    case UIInputEventType::FocusLost: return "FocusLost";
    default: return "Unknown";
    }
}

} // namespace

EditorWindowFrameTransferRequests EditorWindowFrameOrchestrator::UpdateAndAppend(
    EditorContext& editorContext,
    UIEditorWorkspaceController& workspaceController,
    EditorShellRuntime& shellRuntime,
    const ::XCEngine::UI::UIRect& workspaceBounds,
    const std::vector<UIInputEvent>& frameEvents,
    const std::optional<EditorWindowScreenPoint>& cursorScreenPoint,
    std::string_view captureStatusText,
    bool primary,
    bool globalTabDragActive,
    bool useDetachedTitleBarTabStrip,
    UIDrawData& drawData) const {
    LogInputTrace(
        editorContext,
        workspaceController,
        shellRuntime.GetShellInteractionState(),
        frameEvents);

    shellRuntime.Update(
        editorContext,
        workspaceController,
        workspaceBounds,
        frameEvents,
        captureStatusText,
        primary ? EditorShellVariant::Primary : EditorShellVariant::DetachedWindow,
        useDetachedTitleBarTabStrip,
        useDetachedTitleBarTabStrip ? kBorderlessTitleBarHeightDips : 0.0f,
        primary ? 0.0f : kBorderlessTitleBarHeightDips);
    const UIEditorShellInteractionFrame& shellFrame = shellRuntime.GetShellFrame();
    const UIEditorDockHostInteractionState& dockHostInteractionState =
        shellRuntime.GetShellInteractionState().workspaceInteractionState.dockHostInteractionState;

    LogFrameInteractionTrace(workspaceController, frameEvents, shellFrame);
    EditorWindowFrameTransferRequests transferRequests =
        BuildShellTransferRequests(
            globalTabDragActive,
            cursorScreenPoint,
            dockHostInteractionState,
            shellFrame);
    if (const std::optional<EditorUtilityWindowKind> requestedKind =
            editorContext.ConsumeOpenUtilityWindowRequest();
        requestedKind.has_value()) {
        transferRequests.utility.openUtilityWindow = EditorWindowOpenUtilityWindowRequest{
            .kind = *requestedKind,
            .useCursorPlacement = cursorScreenPoint.has_value(),
        };
        if (transferRequests.utility.openUtilityWindow->useCursorPlacement) {
            transferRequests.utility.openUtilityWindow->screenPoint = *cursorScreenPoint;
        }
    }

    for (const WorkspaceTraceEntry& entry : shellRuntime.GetTraceEntries()) {
        AppendUIEditorRuntimeTrace(entry.channel, entry.message);
    }

    shellRuntime.Append(drawData);
    return transferRequests;
}

void EditorWindowFrameOrchestrator::AppendInvalidFrame(
    EditorContext& editorContext,
    UIDrawList& drawList) const {
    drawList.AddText(
        UIPoint(28.0f, 28.0f),
        "Editor shell asset invalid.",
        kShellTextColor,
        16.0f);
    drawList.AddText(
        UIPoint(28.0f, 54.0f),
        editorContext.GetValidationMessage().empty()
            ? std::string("Unknown validation error.")
            : editorContext.GetValidationMessage(),
        kShellMutedTextColor,
        12.0f);
}

std::string EditorWindowFrameOrchestrator::DescribeInputEvents(
    const std::vector<UIInputEvent>& events) const {
    std::ostringstream stream = {};
    stream << "events=[";
    for (std::size_t index = 0; index < events.size(); ++index) {
        if (index > 0u) {
            stream << " | ";
        }

        const UIInputEvent& event = events[index];
        stream << DescribeInputEventType(event)
               << '@'
               << static_cast<int>(event.position.x)
               << ','
               << static_cast<int>(event.position.y);
    }
    stream << ']';
    return stream.str();
}

void EditorWindowFrameOrchestrator::LogInputTrace(
    EditorContext& editorContext,
    const UIEditorWorkspaceController& workspaceController,
    const UIEditorShellInteractionState& shellInteractionState,
    const std::vector<UIInputEvent>& frameEvents) const {
    if (frameEvents.empty() || !IsVerboseRuntimeTraceEnabled()) {
        return;
    }

    AppendUIEditorRuntimeTrace(
        "input",
        DescribeInputEvents(frameEvents) + " | " +
            editorContext.DescribeWorkspaceState(
                workspaceController,
                shellInteractionState));
}

void EditorWindowFrameOrchestrator::LogFrameInteractionTrace(
    const UIEditorWorkspaceController& workspaceController,
    const std::vector<UIInputEvent>& frameEvents,
    const UIEditorShellInteractionFrame& shellFrame) const {
    if (!IsVerboseRuntimeTraceEnabled() ||
        (frameEvents.empty() &&
         !shellFrame.result.workspaceResult.dockHostResult.layoutChanged &&
         !shellFrame.result.workspaceResult.dockHostResult.commandExecuted)) {
        return;
    }

    std::ostringstream frameTrace = {};
    frameTrace << "result consumed="
               << (shellFrame.result.consumed ? "true" : "false")
               << " layoutChanged="
               << (shellFrame.result.workspaceResult.dockHostResult.layoutChanged ? "true"
                                                                                  : "false")
               << " commandExecuted="
               << (shellFrame.result.workspaceResult.dockHostResult.commandExecuted ? "true"
                                                                                     : "false")
               << " active="
               << workspaceController.GetWorkspace().activePanelId
               << " message="
               << shellFrame.result.workspaceResult.dockHostResult.layoutResult.message;
    AppendUIEditorRuntimeTrace("frame", frameTrace.str());
}

EditorWindowFrameTransferRequests EditorWindowFrameOrchestrator::BuildShellTransferRequests(
    bool globalTabDragActive,
    const std::optional<EditorWindowScreenPoint>& cursorScreenPoint,
    const UIEditorDockHostInteractionState& dockHostInteractionState,
    const UIEditorShellInteractionFrame& shellFrame) const {
    EditorWindowFrameTransferRequests transferRequests = {};
    if (!cursorScreenPoint.has_value()) {
        return transferRequests;
    }

    if (!globalTabDragActive &&
        !dockHostInteractionState.activeTabDragNodeId.empty() &&
        !dockHostInteractionState.activeTabDragPanelId.empty()) {
        transferRequests.workspace.beginGlobalTabDrag = EditorWindowPanelTransferRequest{
            dockHostInteractionState.activeTabDragNodeId,
            dockHostInteractionState.activeTabDragPanelId,
            *cursorScreenPoint,
        };
    }

    if (shellFrame.result.workspaceResult.dockHostResult.detachRequested) {
        transferRequests.workspace.detachPanel = EditorWindowPanelTransferRequest{
            shellFrame.result.workspaceResult.dockHostResult.detachedNodeId,
            shellFrame.result.workspaceResult.dockHostResult.detachedPanelId,
            *cursorScreenPoint,
        };
    }

    return transferRequests;
}

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