// Author:  cirakg & claude ai
// Summary: M0 placeholder home screen showing the app name and version.
//
// HomeView: the M0 placeholder home screen. It draws the app name and version
// in the centre of the screen. Milestone M4 replaces it with the entry list.
//
// Performance note: everything that allocates (loading the name string,
// building the version text) happens once in initialize(), not in onUpdate().

import Toybox.Graphics;
import Toybox.Lang;
import Toybox.WatchUi;

class HomeView extends WatchUi.View {

    private var _title as String;
    private var _version as String;
    // Set after the first complete draw, so start-up diagnostics run once.
    private var _firstFrameDone as Boolean = false;

    function initialize() {
        View.initialize();
        _title = WatchUi.loadResource(Rez.Strings.AppName) as String;
        _version = "v" + AppInfo.VERSION;
    }

    function onUpdate(dc as Graphics.Dc) as Void {
        var centerX = dc.getWidth() / 2;
        var centerY = dc.getHeight() / 2;
        var justify = Graphics.TEXT_JUSTIFY_CENTER | Graphics.TEXT_JUSTIFY_VCENTER;

        dc.setColor(Graphics.COLOR_WHITE, Graphics.COLOR_BLACK);
        dc.clear();
        dc.drawText(centerX, centerY, Graphics.FONT_MEDIUM, _title, justify);
        dc.drawText(centerX, centerY + dc.getFontHeight(Graphics.FONT_MEDIUM), Graphics.FONT_XTINY, _version, justify);

        if (!_firstFrameDone) {
            _firstFrameDone = true;
            Diag.firstFrame();
        }
    }
}