Ext.define('PVE.form.MemoryField', {
    extend: 'Ext.form.field.Number',
    alias: 'widget.pveMemoryField',

    allowBlank: false,

    hotplug: false,

    minValue: 32,

    maxValue: 4178944,

    step: 32,

    value: '512', // qm backend default

    allowDecimals: false,

    allowExponential: false,

    computeUpDown: function(value) {
	var me = this;

	if (!me.hotplug) {
	    return { up: value + me.step, down: value - me.step };
	}

	var dimm_size = 512;
	var prev_dimm_size = 0;
	var min_size = 1024;
	var current_size = min_size;
	var value_up = min_size;
	var value_down = min_size;
	var value_start = min_size;

	var i, j;
	for (j = 0; j < 9; j++) {
	    for (i = 0; i < 32; i++) {
		if (value >= current_size && value < current_size + dimm_size) {
		    value_start = current_size;
		    value_up = current_size + dimm_size;
		    value_down = current_size - (i === 0 ? prev_dimm_size : dimm_size);
		}
		current_size += dimm_size;
	    }
	    prev_dimm_size = dimm_size;
	    dimm_size = dimm_size*2;
	}

	return { up: value_up, down: value_down, start: value_start };
    },

    onSpinUp: function() {
	var me = this;
	if (!me.readOnly) {
	    var res = me.computeUpDown(me.getValue());
	    me.setValue(Ext.Number.constrain(res.up, me.minValue, me.maxValue));
	}
    },

    onSpinDown: function() {
	var me = this;
	if (!me.readOnly) {
	    var res = me.computeUpDown(me.getValue());
	    me.setValue(Ext.Number.constrain(res.down, me.minValue, me.maxValue));
	}
    },

    initComponent: function() {
        var me = this;

	if (me.hotplug) {
	    me.minValue = 1024;

	    me.on('blur', function(field) {
		var value = me.getValue();
		var res = me.computeUpDown(value);
		if (value === res.start || value === res.up || value === res.down) {
		    return;
		}
		field.setValue(res.up);
	    });
	}

        me.callParent();
    },
});