/*
 * Base class for all the multitab config panels
 *
 * How to use this:
 *
 * You create a subclass of this, and then define your wanted tabs
 * as items like this:
 *
 * items: [{
 *  title: "myTitle",
 *  xytpe: "somextype",
 *  iconCls: 'fa fa-icon',
 *  groups: ['somegroup'],
 *  expandedOnInit: true,
 *  itemId: 'someId'
 * }]
 *
 * this has to be in the declarative syntax, else we
 * cannot save them for later
 * (so no Ext.create or Ext.apply of an item in the subclass)
 *
 * the groups array expects the itemids of the items
 * which are the parents, which have to come before they
 * are used
 *
 * if you want following the tree:
 *
 * Option1
 * Option2
 *   -> SubOption1
 *	-> SubSubOption1
 *
 * the suboption1 group array has to look like this:
 * groups: ['itemid-of-option2']
 *
 * and of subsuboption1:
 * groups: ['itemid-of-option2', 'itemid-of-suboption1']
 *
 * setting the expandedOnInit determines if the item/group is expanded
 * initially (false by default)
 */
Ext.define('PMG.panel.Config', {
    extend: 'Ext.panel.Panel',
    alias: 'widget.pmgPanelConfig',

    viewFilter: undefined, // a filter to pass to that ressource grid

    dockedItems: [{
	// this is needed for the overflow handler
	xtype: 'toolbar',
	overflowHandler: 'scroller',
	dock: 'left',
	style: {
	    backgroundColor: '#f5f5f5',
	    padding: 0,
	    margin: 0,
	},
	items: {
	    xtype: 'treelist',
	    itemId: 'menu',
	    ui: 'nav',
	    expanderOnly: true,
	    expanderFirst: false,
	    animation: false,
	    singleExpand: false,
	    listeners: {
		selectionchange: function(treeList, selection) {
		    let view = this.up('panel');
		    view.suspendLayout = true;
		    view.activateCard(selection.data.id);
		    view.suspendLayout = false;
		    view.updateLayout();
		},
		itemclick: function(treelist, info) {
		    var olditem = treelist.getSelection();
		    var newitem = info.node;

		    // when clicking on the expand arrow,
		    // we dont select items, but still want
		    // the original behaviour
		    if (info.select === false) {
			return;
		    }

		    // if you click on a different item which is open,
		    // leave it open
		    // else toggle the clicked item
		    if (olditem.data.id !== newitem.data.id &&
			newitem.data.expanded === true) {
			info.toggle = false;
		    } else {
			info.toggle = true;
		    }
		},
	    },
	},
    }],

    firstItem: '',
    layout: 'card',
    border: 0,

    // used for automated test
    selectById: function(cardid) {
	var me = this;

	var root = me.store.getRoot();
	var selection = root.findChild('id', cardid, true);

	if (selection) {
	    selection.expand();
	    var menu = me.down('#menu');
	    menu.setSelection(selection);
	    return cardid;
	}
	return null;
    },

    activateCard: function(cardid) {
	var me = this;
	if (me.savedItems[cardid]) {
	    var curcard = me.getLayout().getActiveItem();
	    me.add(me.savedItems[cardid]);
	    if (curcard) {
		me.setActiveItem(cardid);
		me.remove(curcard, true);

		// trigger state change

		var ncard = cardid;
		// Note: '' is alias for first tab.
		// First tab can be 'search' or something else
		if (cardid === me.firstItem) {
		    ncard = '';
		}
		if (me.hstateid) {
		   me.sp.set(me.hstateid, { value: ncard });
		}
	    }
	}
    },

    initComponent: function() {
        var me = this;

	var stateid = me.hstateid;

	me.sp = Ext.state.Manager.getProvider();

	var activeTab; // leaving this undefined means items[0] will be the default tab

	if (stateid) {
	    var state = me.sp.get(stateid);
	    if (state && state.value) {
		// if this tab does not exists, it chooses the first
		activeTab = state.value;
	    }
	}

	// include search tab
	me.items = me.items || [];

	me.savedItems = {};
	if (me.items[0]) {
	    me.firstItem = me.items[0].itemId;
	}

	me.store = Ext.create('Ext.data.TreeStore', {
	    root: {
		expanded: true,
	    },
	});
	var root = me.store.getRoot();
	me.items.forEach(function(item) {
	    var treeitem = Ext.create('Ext.data.TreeModel', {
		id: item.itemId,
		text: item.title,
		iconCls: item.iconCls,
		leaf: true,
		expanded: item.expandedOnInit,
	    });
	    item.header = false;
	    if (me.savedItems[item.itemId] !== undefined) {
		throw "itemId already exists, please use another";
	    }
	    me.savedItems[item.itemId] = item;

	    var group;
	    var curnode = root;

	    // get/create the group items
	    while (Ext.isArray(item.groups) && item.groups.length > 0) {
		group = item.groups.shift();

		var child = curnode.findChild('id', group);
		if (child === null) {
		    // did not find the group item
		    // so add it where we are
		    break;
		}
		curnode = child;
	    }

	    // insert the item

	    // lets see if it already exists
	    var node = curnode.findChild('id', item.itemId);

	    if (node === null) {
		curnode.appendChild(treeitem);
	    } else {
		// should not happen!
		throw "id already exists";
	    }
	});

	delete me.items;
	me.defaults = me.defaults || {};
	Ext.apply(me.defaults, {
	    viewFilter: me.viewFilter,
	    border: 0,
	});

	me.callParent();

	var menu = me.down('#menu');
	var selection = root.findChild('id', activeTab, true) || root.firstChild;
	var node = selection;
	while (node !== root) {
	    node.expand();
	    node = node.parentNode;
	}
	menu.setStore(me.store);
	menu.setSelection(selection);

	// on a state change,
	// select the new item
	const statechange = function(sp, key, newState) {
	    // it the state change is for this panel
	    if (stateid && (key === stateid) && newState) {
		// get active item
		var acard = me.getLayout().getActiveItem().itemId;
		// get the itemid of the new value
		var ncard = newState.value || me.firstItem;
		if (ncard && (acard !== ncard)) {
		    // select the chosen item
		    menu.setSelection(root.findChild('id', ncard, true) || root.firstChild);
		}
	    }
	};

	if (stateid) {
	    me.mon(me.sp, 'statechange', statechange);
	}
    },
});