#include "Platform/Win32/EditorWindow.h"
#include "Platform/Win32/EditorWindowConstants.h"
#include "Platform/Win32/EditorWindowStyle.h"

#include <XCEngine/UI/DrawData.h>

#include <algorithm>

#include <windowsx.h>

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

using namespace EditorWindowSupport;
using ::XCEngine::UI::UIColor;
using ::XCEngine::UI::UIDrawList;
using ::XCEngine::UI::UIPoint;
using ::XCEngine::UI::UIRect;

Host::BorderlessWindowChromeHitTarget EditorWindow::HitTestBorderlessWindowChrome(
    LPARAM lParam) const {
    if (!IsBorderlessWindowEnabled() || m_window.hwnd == nullptr) {
        return Host::BorderlessWindowChromeHitTarget::None;
    }

    RECT clientRect = {};
    if (!GetClientRect(m_window.hwnd, &clientRect)) {
        return Host::BorderlessWindowChromeHitTarget::None;
    }

    const float clientWidthDips =
        PixelsToDips(static_cast<float>((std::max)(clientRect.right - clientRect.left, 1L)));
    const Host::BorderlessWindowChromeLayout layout =
        ResolveBorderlessWindowChromeLayout(clientWidthDips);
    return Host::HitTestBorderlessWindowChrome(
        layout,
        ConvertClientPixelsToDips(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)));
}

Host::BorderlessWindowChromeLayout EditorWindow::ResolveBorderlessWindowChromeLayout(
    float clientWidthDips) const {
    return Host::BuildBorderlessWindowChromeLayout(
        UIRect(0.0f, 0.0f, clientWidthDips, kBorderlessTitleBarHeightDips),
        0.0f);
}

void EditorWindow::AppendBorderlessWindowChrome(
    UIDrawList& drawList,
    float clientWidthDips) const {
    if (!IsBorderlessWindowEnabled()) {
        return;
    }

    const Host::BorderlessWindowChromeLayout layout =
        ResolveBorderlessWindowChromeLayout(clientWidthDips);
    const float iconExtent = 16.0f;
    const float iconInsetLeft = 8.0f;
    const float iconTextGap = 8.0f;
    const float iconX = layout.titleBarRect.x + iconInsetLeft;
    const float iconY =
        layout.titleBarRect.y +
        (std::max)(0.0f, (layout.titleBarRect.height - iconExtent) * 0.5f);
    drawList.AddFilledRect(layout.titleBarRect, kShellSurfaceColor);
    drawList.AddLine(
        UIPoint(layout.titleBarRect.x, layout.titleBarRect.y + layout.titleBarRect.height),
        UIPoint(
            layout.titleBarRect.x + layout.titleBarRect.width,
            layout.titleBarRect.y + layout.titleBarRect.height),
        kShellBorderColor,
        1.0f);
    if (m_render.titleBarLogoIcon.IsValid()) {
        drawList.AddImage(
            UIRect(iconX, iconY, iconExtent, iconExtent),
            m_render.titleBarLogoIcon,
            UIColor(1.0f, 1.0f, 1.0f, 1.0f));
    }

    const std::string& titleText =
        m_window.titleText.empty() ? std::string("XCEngine Editor") : m_window.titleText;
    drawList.AddText(
        UIPoint(
            iconX + (m_render.titleBarLogoIcon.IsValid() ? (iconExtent + iconTextGap) : 4.0f),
            layout.titleBarRect.y +
                (std::max)(
                    0.0f,
                    (layout.titleBarRect.height - kBorderlessTitleBarFontSize) * 0.5f - 1.0f)),
        titleText,
        kShellTextColor,
        kBorderlessTitleBarFontSize);
    Host::AppendBorderlessWindowChrome(
        drawList,
        layout,
        m_chrome.chromeState,
        IsBorderlessWindowMaximized());
}

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