#include "XCUIDemoPanel.h"

#include <imgui.h>

#include <algorithm>

namespace XCEngine {
namespace NewEditor {

namespace {

constexpr float kCanvasHudHeight = 82.0f;
constexpr float kCanvasHudPadding = 10.0f;
constexpr char kPreviewDebugSource[] = "new_editor.panels.xcui_demo";

} // namespace

void XCUIDemoPanel::Render() {
    ImGui::SetNextWindowSize(ImVec2(1040.0f, 720.0f), ImGuiCond_Appearing);
    ImGui::SetNextWindowDockID(ImGui::GetID("XCNewEditorDockSpace"), ImGuiCond_Appearing);

    bool open = true;
    if (!ImGui::Begin(GetName().c_str(), &open)) {
        ImGui::End();
        if (!open) {
            SetVisible(false);
        }
        return;
    }

    if (ImGui::Button("Reload Documents")) {
        m_lastReloadSucceeded = m_runtime.ReloadDocuments();
    }
    ImGui::SameLine();
    ImGui::Checkbox("Canvas HUD", &m_showCanvasHud);
    ImGui::SameLine();
    ImGui::Checkbox("Debug Rects", &m_showDebugRects);
    ImGui::SameLine();
    ImGui::TextUnformatted(m_lastReloadSucceeded ? "Reload: OK" : "Reload: Failed");
    ImGui::Separator();

    const float diagnosticsHeight = 232.0f;
    const ImVec2 hostRegion = ImGui::GetContentRegionAvail();
    const float canvasHeight = (std::max)(140.0f, hostRegion.y - diagnosticsHeight);
    const float topInset = m_showCanvasHud ? (kCanvasHudHeight + kCanvasHudPadding) : 0.0f;
    const XCUIDemoPanelFrameComposition& composition = ComposeFrame(
        XCUIDemoPanelFrameComposeOptions{
            canvasHeight,
            topInset,
            m_hostedPreviewEnabled,
            m_showCanvasHud,
            m_showDebugRects,
            0u,
            "XCUIDemoCanvasHost"});
    const ::XCEngine::Editor::XCUIBackend::XCUIDemoFrameStats& stats = composition.frame->stats;

    ImGui::Separator();
    ImGui::BeginChild("XCUIDemoDiagnostics", ImVec2(0.0f, 0.0f), false, ImGuiWindowFlags_NoScrollbar);
    ImGui::SeparatorText("Preview");
    ImGui::Text(
        "Path: %s | state: %s",
        composition.previewPathLabel.c_str(),
        composition.previewStateLabel.c_str());
    ImGui::Text(
        "Presenter: presented %s | submit->native %s",
        composition.previewStats.presented ? "yes" : "no",
        composition.previewStats.queuedToNativePass ? "yes" : "no");
    ImGui::Text(
        "Submitted: %zu lists / %zu cmds | Flushed: %zu lists / %zu cmds",
        composition.previewStats.submittedDrawListCount,
        composition.previewStats.submittedCommandCount,
        composition.previewStats.flushedDrawListCount,
        composition.previewStats.flushedCommandCount);
    ImGui::TextWrapped(
        "Source: %s",
        composition.hasHostedSurfaceDescriptor && !composition.hostedSurfaceDescriptor.debugSource.empty()
            ? composition.hostedSurfaceDescriptor.debugSource.c_str()
            : kPreviewDebugSource);
    if (composition.nativeHostedPreview) {
        ImGui::Text(
            "Surface descriptor: %s | image published: %s | queued frame index: %zu",
            composition.hasHostedSurfaceDescriptor ? "yes" : "no",
            composition.showHostedSurfaceImage ? "yes" : "no",
            composition.hasHostedSurfaceDescriptor ? composition.hostedSurfaceDescriptor.queuedFrameIndex : 0u);
        if (composition.hasHostedSurfaceDescriptor) {
            ImGui::Text(
                "Surface: %ux%u | logical: %.0f x %.0f | rendered rect: %.0f, %.0f %.0f x %.0f",
                composition.hostedSurfaceDescriptor.image.surfaceWidth,
                composition.hostedSurfaceDescriptor.image.surfaceHeight,
                composition.hostedSurfaceDescriptor.logicalSize.width,
                composition.hostedSurfaceDescriptor.logicalSize.height,
                composition.hostedSurfaceDescriptor.image.renderedCanvasRect.x,
                composition.hostedSurfaceDescriptor.image.renderedCanvasRect.y,
                composition.hostedSurfaceDescriptor.image.renderedCanvasRect.width,
                composition.hostedSurfaceDescriptor.image.renderedCanvasRect.height);
        } else {
            ImGui::TextDisabled("No native surface descriptor has been published back yet.");
        }
    } else {
        ImGui::TextDisabled("Legacy path renders directly into the panel draw list. No native surface descriptor exists.");
    }

    ImGui::SeparatorText("Runtime");
    ImGui::Text("Status: %s", stats.statusMessage.c_str());
    ImGui::Text(
        "Tree gen: %llu | elements: %zu | dirty roots: %zu",
        static_cast<unsigned long long>(stats.treeGeneration),
        stats.elementCount,
        stats.dirtyRootCount);
    ImGui::Text(
        "Draw lists: %zu | draw cmds: %zu | dependencies: %zu",
        stats.drawListCount,
        stats.commandCount,
        stats.dependencyCount);
    ImGui::Text(
        "Hovered: %s | Focused: %s",
        stats.hoveredElementId.empty() ? "none" : stats.hoveredElementId.c_str(),
        stats.focusedElementId.empty() ? "none" : stats.focusedElementId.c_str());
    ImGui::Text(
        "Last command: %s | Accent: %s",
        stats.lastCommandId.empty() ? "none" : stats.lastCommandId.c_str(),
        stats.accentEnabled ? "on" : "off");
    ImGui::Text(
        "Canvas: %.0f x %.0f",
        composition.input.canvasRect.width,
        composition.input.canvasRect.height);

    ImGui::SeparatorText("Input");
    ImGui::Text(
        "Pointer: %.0f, %.0f | inside %s | down %s | pressed %s | released %s",
        composition.input.pointerPosition.x,
        composition.input.pointerPosition.y,
        composition.input.pointerInside ? "yes" : "no",
        composition.input.pointerDown ? "yes" : "no",
        composition.input.pointerPressed ? "yes" : "no",
        composition.input.pointerReleased ? "yes" : "no");
    ImGui::Text(
        "Focus %s | capture mouse %s | capture keyboard %s | text input %s | events %zu",
        composition.input.windowFocused ? "yes" : "no",
        composition.input.wantCaptureMouse ? "yes" : "no",
        composition.input.wantCaptureKeyboard ? "yes" : "no",
        composition.input.wantTextInput ? "yes" : "no",
        composition.input.events.size());
    ImGui::EndChild();

    ImGui::End();

    if (!open) {
        SetVisible(false);
    }
}

} // namespace NewEditor
} // namespace XCEngine