#include "XCUIDemoPanel.h"

#include "UI/UI.h"

#include <XCEngine/UI/DrawData.h>

#include <imgui.h>

namespace {

::XCEngine::UI::UIDrawList BuildXCUIDemoDrawList(
    const ImVec2& canvasMin,
    const ImVec2& canvasSize) {
    using ::XCEngine::UI::UIColor;
    using ::XCEngine::UI::UIDrawList;
    using ::XCEngine::UI::UIPoint;
    using ::XCEngine::UI::UIRect;

    UIDrawList drawList("XCUI Transition Demo");
    drawList.PushClipRect(UIRect(canvasMin.x, canvasMin.y, canvasSize.x, canvasSize.y));
    drawList.AddFilledRect(
        UIRect(canvasMin.x, canvasMin.y, canvasSize.x, canvasSize.y),
        UIColor(0.09f, 0.11f, 0.14f, 1.0f),
        10.0f);
    drawList.AddRectOutline(
        UIRect(canvasMin.x, canvasMin.y, canvasSize.x, canvasSize.y),
        UIColor(0.32f, 0.40f, 0.49f, 1.0f),
        1.0f,
        10.0f);

    const float cardX = canvasMin.x + 18.0f;
    const float cardY = canvasMin.y + 18.0f;
    const float cardWidth = (canvasSize.x - 36.0f) > 120.0f ? (canvasSize.x - 36.0f) : 120.0f;
    drawList.AddFilledRect(
        UIRect(cardX, cardY, cardWidth, 56.0f),
        UIColor(0.15f, 0.20f, 0.27f, 1.0f),
        8.0f);
    drawList.AddFilledRect(
        UIRect(cardX + 14.0f, cardY + 16.0f, 10.0f, 10.0f),
        UIColor(0.18f, 0.76f, 0.58f, 1.0f),
        5.0f);
    drawList.AddText(
        UIPoint(cardX + 32.0f, cardY + 12.0f),
        "XCUI Transition Backend",
        UIColor(0.96f, 0.97f, 0.99f, 1.0f),
        18.0f);
    drawList.AddText(
        UIPoint(cardX + 32.0f, cardY + 33.0f),
        "This panel is generated by XCUI draw commands, then flushed through ImGui.",
        UIColor(0.74f, 0.79f, 0.86f, 1.0f),
        13.0f);

    const float statY = cardY + 76.0f;
    drawList.AddFilledRect(
        UIRect(cardX, statY, 140.0f, 74.0f),
        UIColor(0.11f, 0.16f, 0.22f, 1.0f),
        8.0f);
    drawList.AddFilledRect(
        UIRect(cardX + 158.0f, statY, 180.0f, 74.0f),
        UIColor(0.11f, 0.16f, 0.22f, 1.0f),
        8.0f);
    drawList.AddText(
        UIPoint(cardX + 14.0f, statY + 12.0f),
        "Primitive Set",
        UIColor(0.68f, 0.75f, 0.84f, 1.0f),
        13.0f);
    drawList.AddText(
        UIPoint(cardX + 14.0f, statY + 36.0f),
        "Rect / Border / Text / Image",
        UIColor(0.95f, 0.97f, 0.99f, 1.0f),
        15.0f);
    drawList.AddText(
        UIPoint(cardX + 172.0f, statY + 12.0f),
        "Backend Flow",
        UIColor(0.68f, 0.75f, 0.84f, 1.0f),
        13.0f);
    drawList.AddText(
        UIPoint(cardX + 172.0f, statY + 36.0f),
        "UIDrawList -> ImGuiTransitionBackend -> ImDrawList",
        UIColor(0.95f, 0.97f, 0.99f, 1.0f),
        15.0f);

    const float footerY = canvasMin.y + canvasSize.y - 54.0f;
    if (footerY > statY + 90.0f) {
        drawList.AddFilledRect(
            UIRect(cardX, footerY, cardWidth, 36.0f),
            UIColor(0.14f, 0.17f, 0.22f, 1.0f),
            8.0f);
        drawList.AddText(
            UIPoint(cardX + 14.0f, footerY + 10.0f),
            "Subplan-05 MVP: XCUI owns draw data, ImGui is only the transition renderer.",
            UIColor(0.79f, 0.84f, 0.90f, 1.0f),
            13.0f);
    }

    drawList.PopClipRect();
    return drawList;
}

} // namespace

namespace XCEngine {
namespace Editor {

XCUIDemoPanel::XCUIDemoPanel()
    : Panel("XCUI Demo") {
}

void XCUIDemoPanel::Render() {
    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
    UI::PanelWindowScope panel(m_name.c_str());
    ImGui::PopStyleVar();
    if (!panel.IsOpen()) {
        return;
    }

    UI::PanelContentScope content("XCUIDemoContent", ImVec2(0.0f, 0.0f));
    if (!content.IsOpen()) {
        return;
    }

    const ImVec2 availableSize = ImGui::GetContentRegionAvail();
    if (availableSize.x <= 1.0f || availableSize.y <= 1.0f) {
        ImGui::Dummy(ImVec2(0.0f, 0.0f));
        return;
    }

    const ImVec2 canvasMin = ImGui::GetCursorScreenPos();
    ImGui::InvisibleButton("##XCUIDemoCanvas", availableSize);

    ::XCEngine::UI::UIDrawData drawData = {};
    drawData.AddDrawList(BuildXCUIDemoDrawList(canvasMin, availableSize));

    m_backend.BeginFrame();
    m_backend.Submit(drawData);
    m_backend.EndFrame(ImGui::GetWindowDrawList());
}

} // namespace Editor
} // namespace XCEngine