/*
 * Left Treepanel, containing all the resources we manage in this datacenter: server nodes, server storages, VMs and Containers
 */
Ext.define('PVE.tree.ResourceTree', {
    extend: 'Ext.tree.TreePanel',
    alias: ['widget.pveResourceTree'],

    userCls: 'proxmox-tags-circle',

    statics: {
	typeDefaults: {
	    node: {
		iconCls: 'fa fa-building',
		text: gettext('Nodes'),
	    },
	    pool: {
		iconCls: 'fa fa-tags',
		text: gettext('Resource Pool'),
	    },
	    storage: {
		iconCls: 'fa fa-database',
		text: gettext('Storage'),
	    },
	    sdn: {
		iconCls: 'fa fa-th',
		text: gettext('SDN'),
	    },
	    qemu: {
		iconCls: 'fa fa-desktop',
		text: gettext('Virtual Machine'),
	    },
	    lxc: {
		//iconCls: 'x-tree-node-lxc',
		iconCls: 'fa fa-cube',
		text: gettext('LXC Container'),
	    },
	    template: {
		iconCls: 'fa fa-file-o',
	    },
	},
    },

    useArrows: true,

    // private
    nodeSortFn: function(node1, node2) {
	let me = this;
	let n1 = node1.data, n2 = node2.data;

	if (!n1.groupbyid === !n2.groupbyid) {
	    let n1IsGuest = n1.type === 'qemu' || n1.type === 'lxc';
	    let n2IsGuest = n2.type === 'qemu' || n2.type === 'lxc';
	    if (me['group-guest-types'] || !n1IsGuest || !n2IsGuest) {
		// first sort (group) by type
		if (n1.type > n2.type) {
		    return 1;
		} else if (n1.type < n2.type) {
		    return -1;
		}
	    }

	    // then sort (group) by ID
	    if (n1IsGuest) {
		if (me['group-templates'] && (!n1.template !== !n2.template)) {
		    return n1.template ? 1 : -1; // sort templates after regular VMs
		}
		if (me['sort-field'] === 'vmid') {
		    if (n1.vmid > n2.vmid) { // prefer VMID as metric for guests
			return 1;
		    } else if (n1.vmid < n2.vmid) {
			return -1;
		    }
		} else {
		    return n1.name.localeCompare(n2.name);
		}
	    }
	    // same types but not a guest
	    return n1.id > n2.id ? 1 : n1.id < n2.id ? -1 : 0;
	} else if (n1.groupbyid) {
	    return -1;
	} else if (n2.groupbyid) {
	    return 1;
	}
	return 0; // should not happen
    },

    // private: fast binary search
    findInsertIndex: function(node, child, start, end) {
	let me = this;

	let diff = end - start;
	if (diff <= 0) {
	    return start;
	}
	let mid = start + (diff >> 1);

	let res = me.nodeSortFn(child, node.childNodes[mid]);
	if (res <= 0) {
	    return me.findInsertIndex(node, child, start, mid);
	} else {
	    return me.findInsertIndex(node, child, mid + 1, end);
	}
    },

    setIconCls: function(info) {
	let cls = PVE.Utils.get_object_icon_class(info.type, info);
	if (cls !== '') {
	    info.iconCls = cls;
	}
    },

    // add additional elements to text. Currently only the usage indicator for storages
    setText: function(info) {
	let me = this;

	let status = '';
	if (info.type === 'storage') {
	    let usage = info.disk / info.maxdisk;
	    if (usage >= 0.0 && usage <= 1.0) {
		let barHeight = (usage * 100).toFixed(0);
		let remainingHeight = (100 - barHeight).toFixed(0);
		status = '<div class="usage-wrapper">';
		status += `<div class="usage-negative" style="height: ${remainingHeight}%"></div>`;
		status += `<div class="usage" style="height: ${barHeight}%"></div>`;
		status += '</div> ';
	    }
	}
	if (Ext.isNumeric(info.vmid) && info.vmid > 0) {
	    if (PVE.UIOptions.getTreeSortingValue('sort-field') !== 'vmid') {
		info.text = `${info.name} (${String(info.vmid)})`;
	    }
	}

	info.text += PVE.Utils.renderTags(info.tags, PVE.UIOptions.tagOverrides);

	info.text = status + info.text;
    },

    setToolTip: function(info) {
	if (info.type === 'pool' || info.groupbyid !== undefined) {
	    return;
	}

	let qtips = [gettext('Status') + ': ' + (info.qmpstatus || info.status)];
	if (info.lock) {
	    qtips.push(Ext.String.format(gettext('Config locked ({0})'), info.lock));
	}
	if (info.hastate !== 'unmanaged') {
	    qtips.push(gettext('HA State') + ": " + info.hastate);
	}

	info.qtip = qtips.join(', ');
    },

    // private
    addChildSorted: function(node, info) {
	let me = this;

	me.setIconCls(info);
	me.setText(info);
	me.setToolTip(info);

	if (info.groupbyid) {
	    info.text = info.groupbyid;
	    if (info.type === 'type') {
		let defaults = PVE.tree.ResourceTree.typeDefaults[info.groupbyid];
		if (defaults && defaults.text) {
		    info.text = defaults.text;
		}
	    }
	}
	let child = Ext.create('PVETree', info);

	if (node.childNodes) {
	    let pos = me.findInsertIndex(node, child, 0, node.childNodes.length);
	    node.insertBefore(child, node.childNodes[pos]);
	} else {
	    node.insertBefore(child);
	}

	return child;
    },

    // private
    groupChild: function(node, info, groups, level) {
	let me = this;

	let groupBy = groups[level];
	let v = info[groupBy];

	if (v) {
	    let group = node.findChild('groupbyid', v);
	    if (!group) {
		let groupinfo;
		if (info.type === groupBy) {
		    groupinfo = info;
		} else {
		    groupinfo = {
			type: groupBy,
			id: groupBy + "/" + v,
		    };
		    if (groupBy !== 'type') {
			groupinfo[groupBy] = v;
		    }
		}
		groupinfo.leaf = false;
		groupinfo.groupbyid = v;
		group = me.addChildSorted(node, groupinfo);
	    }
	    if (info.type === groupBy) {
		return group;
	    }
	    if (group) {
		return me.groupChild(group, info, groups, level + 1);
	    }
	}

	return me.addChildSorted(node, info);
    },

    saveSortingOptions: function() {
	let me = this;
	let changed = false;
	for (const key of ['sort-field', 'group-templates', 'group-guest-types']) {
	    let newValue = PVE.UIOptions.getTreeSortingValue(key);
	    if (me[key] !== newValue) {
		me[key] = newValue;
		changed = true;
	    }
	}
	return changed;
    },

    initComponent: function() {
	let me = this;
	me.saveSortingOptions();

	let rstore = PVE.data.ResourceStore;
	let sp = Ext.state.Manager.getProvider();

	if (!me.viewFilter) {
	    me.viewFilter = {};
	}

	let pdata = {
	    dataIndex: {},
	    updateCount: 0,
	};

	let store = Ext.create('Ext.data.TreeStore', {
	    model: 'PVETree',
	    root: {
		expanded: true,
		id: 'root',
		text: gettext('Datacenter'),
		iconCls: 'fa fa-server',
	    },
	});

	let stateid = 'rid';

	const changedFields = [
	    'text', 'running', 'template', 'status', 'qmpstatus', 'hastate', 'lock', 'tags',
	];

	let updateTree = function() {
	    store.suspendEvents();

	    let rootnode = me.store.getRootNode();
	    // remember selected node (and all parents)
	    let sm = me.getSelectionModel();
	    let lastsel = sm.getSelection()[0];
	    let parents = [];
	    let sorting_changed = me.saveSortingOptions();
	    for (let node = lastsel; node; node = node.parentNode) {
		parents.push(node);
	    }

	    let groups = me.viewFilter.groups || [];
	    // explicitly check for node/template, as those are not always grouping attributes
	    // also check for name for when the tree is sorted by name
	    let moveCheckAttrs = groups.concat(['node', 'template', 'name']);
	    let filterfn = me.viewFilter.filterfn;

	    let reselect = false; // for disappeared nodes
	    let index = pdata.dataIndex;
	    // remove vanished or moved items and update changed items in-place
	    for (const [key, olditem] of Object.entries(index)) {
		// getById() use find(), which is slow (ExtJS4 DP5)
		let item = rstore.data.get(olditem.data.id);

		let changed = sorting_changed, moved = sorting_changed;
		if (item) {
		    // test if any grouping attributes changed, catches migrated tree-nodes in server view too
		    for (const attr of moveCheckAttrs) {
			if (item.data[attr] !== olditem.data[attr]) {
			    moved = true;
			    break;
			}
		    }

		    // tree item has been updated
		    for (const field of changedFields) {
			if (item.data[field] !== olditem.data[field]) {
			    changed = true;
			    break;
			}
		    }
		    // FIXME: also test filterfn()?
		}

		if (changed) {
		    olditem.beginEdit();
		    let info = olditem.data;
		    Ext.apply(info, item.data);
		    me.setIconCls(info);
		    me.setText(info);
		    me.setToolTip(info);
		    olditem.commit();
		}
		if ((!item || moved) && olditem.isLeaf()) {
		    delete index[key];
		    let parentNode = olditem.parentNode;
		    // a selected item moved (migration) or disappeared (destroyed), so deselect that
		    // node now and try to reselect the moved (or its parent) node later
		    if (lastsel && olditem.data.id === lastsel.data.id) {
			reselect = true;
			sm.deselect(olditem);
		    }
		    // store events are suspended, so remove the item manually
		    store.remove(olditem);
		    parentNode.removeChild(olditem, true);
		}
	    }

	    rstore.each(function(item) { // add new items
		let olditem = index[item.data.id];
		if (olditem) {
		    return;
		}
		if (filterfn && !filterfn(item)) {
		    return;
		}
		let info = Ext.apply({ leaf: true }, item.data);

		let child = me.groupChild(rootnode, info, groups, 0);
		if (child) {
		    index[item.data.id] = child;
		}
	    });

	    store.resumeEvents();
	    store.fireEvent('refresh', store);

	    // select parent node if original selected node vanished
	    if (lastsel && !rootnode.findChild('id', lastsel.data.id, true)) {
		lastsel = rootnode;
		for (const node of parents) {
		    if (rootnode.findChild('id', node.data.id, true)) {
			lastsel = node;
			break;
		    }
		}
		me.selectById(lastsel.data.id);
	    } else if (lastsel && reselect) {
		me.selectById(lastsel.data.id);
	    }

	    // on first tree load set the selection from the stateful provider
	    if (!pdata.updateCount) {
		rootnode.expand();
		me.applyState(sp.get(stateid));
	    }

	    pdata.updateCount++;
	};

	sp.on('statechange', (_sp, key, value) => {
	    if (key === stateid) {
		me.applyState(value);
	    }
	});

	Ext.apply(me, {
	    allowSelection: true,
	    store: store,
	    viewConfig: {
		animate: false, // note: animate cause problems with applyState
	    },
	    listeners: {
		itemcontextmenu: PVE.Utils.createCmdMenu,
		destroy: function() {
		    rstore.un("load", updateTree);
		},
		beforecellmousedown: function(tree, td, cellIndex, record, tr, rowIndex, ev) {
		    let sm = me.getSelectionModel();
		    // disable selection when right clicking except if the record is already selected
		    me.allowSelection = ev.button !== 2 || sm.isSelected(record);
		},
		beforeselect: function(tree, record, index, eopts) {
		    let allow = me.allowSelection;
		    me.allowSelection = true;
		    return allow;
		},
		itemdblclick: PVE.Utils.openTreeConsole,
	    },
	    setViewFilter: function(view) {
		me.viewFilter = view;
		me.clearTree();
		updateTree();
	    },
	    setDatacenterText: function(clustername) {
		let rootnode = me.store.getRootNode();

		let rnodeText = gettext('Datacenter');
		if (clustername !== undefined) {
		    rnodeText += ' (' + clustername + ')';
		}

		rootnode.beginEdit();
		rootnode.data.text = rnodeText;
		rootnode.commit();
	    },
	    clearTree: function() {
		pdata.updateCount = 0;
		let rootnode = me.store.getRootNode();
		rootnode.collapse();
		rootnode.removeAll();
		pdata.dataIndex = {};
		me.getSelectionModel().deselectAll();
	    },
	    selectExpand: function(node) {
		let sm = me.getSelectionModel();
		if (!sm.isSelected(node)) {
		    sm.select(node);
		    for (let iter = node; iter; iter = iter.parentNode) {
			if (!iter.isExpanded()) {
			    iter.expand();
			}
		    }
		    me.getView().focusRow(node);
		}
	    },
	    selectById: function(nodeid) {
		let rootnode = me.store.getRootNode();
		let node;
		if (nodeid === 'root') {
		    node = rootnode;
		} else {
		    node = rootnode.findChild('id', nodeid, true);
		}
		if (node) {
		    me.selectExpand(node);
		}
		return node;
	    },
	    applyState: function(state) {
		if (state && state.value) {
		    me.selectById(state.value);
		} else {
		    me.getSelectionModel().deselectAll();
		}
	    },
	});

	me.callParent();

	me.getSelectionModel().on('select', (_sm, n) => sp.set(stateid, { value: n.data.id }));

	rstore.on("load", updateTree);
	rstore.startUpdate();
    },

});