/*
  Copyright (C) 2017 Michal Kosciesza <michal@mkiol.net>

  This file is part of Kaktus.

  Kaktus is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  Kaktus is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with Kaktus.  If not, see <http://www.gnu.org/licenses/>.
*/

import QtQuick 2.0
import Sailfish.Silica 1.0

Rectangle {
    id: root

    property string text

    //Source: http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
    function hash(text, index) {
        var hash = 0, i, chr, len
        if (text.length === 0 || text.length < index) return hash
        for (i = index, len = text.length; i < len; i++) {
            chr   = text.charCodeAt(i)
            hash  = ((hash << 5) - hash) + chr
        }
        return Math.abs(hash)%255
    }

    Component.onCompleted: {
        var r = text.length > 0 ? hash(text,0)/255 : 1
        var g = text.length > 1 ? hash(text,1)/255 : 1
        var b = text.length > 2 ? hash(text,2)/255 : 1
        var base = Qt.rgba(r, g, b, .8)
        var colorBg = Qt.darker(base, 1.5)
        var colorFg = Qt.lighter(base, 3.0)
        color = colorBg
        label.color = colorFg
    }

    Label {
        id: label
        text: root.text.substring(0,1).toUpperCase()
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        font.pixelSize: root.height * 0.8
        anchors.fill: parent
    }
}