ui: tape/BackupOverview: rework BackupOverview (again)

instead of showing the snapshots directly under the pool and then the
media-sets, list the media-sets under the pool and only after the
snapshots

this has several advantages:
* we only have to read one set of tape catalog data on expand and not all of
  them everytime (which does not scale)
* we can show media-sets without snapshots, this can happen when we
  inventoried a set of tapes from another pbs instance, or lost the
  catalog data somehow

the disadvantage is that one has to go look for the media set where the
snapshot is included, but we can solve this by implementing a search
function in the future (in the backend)

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/tape/BackupOverview.js

@@ -25,7 +25,7 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 	    }
 
 	    let mediaset = selection[0].data.text;
-	    let uuid = selection[0].data.uuid;
+	    let uuid = selection[0].data['media-set-uuid'];
 	    Ext.create('PBS.TapeManagement.TapeRestoreWindow', {
 		mediaset,
 		uuid,
@@ -38,62 +38,47 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 	},
 
 	loadContent: async function() {
+	    let me = this;
 	    let content_response = await PBS.Async.api2({
-		url: '/api2/extjs/tape/media/content',
+		url: '/api2/extjs/tape/media/list',
 	    });
 	    let data = {};
 
 	    for (const entry of content_response.result.data) {
 		let pool = entry.pool;
-		let [type, group_id, id] = PBS.Utils.parse_snapshot_id(entry.snapshot);
-		let group = `${type}/${group_id}`;
 		let media_set = entry['media-set-name'];
-		let uuid = entry['media-set-uuid'];
-		let ctime = entry['media-set-ctime'];
 		if (data[pool] === undefined) {
 		    data[pool] = {};
 		}
 
-		if (data[pool][group] === undefined) {
-		    data[pool][group] = {};
+		if (data[pool][media_set] === undefined) {
+		    data[pool][media_set] = entry;
+		    data[pool][media_set].text = media_set;
+		    data[pool][media_set].tapes = 1;
+		    data[pool][media_set]['seq-nr'] = undefined;
+		    data[pool][media_set].is_media_set = true;
+		} else {
+		    data[pool][media_set].tapes++;
 		}
-
-		if (data[pool][group][id] === undefined) {
-		    data[pool][group][id] = [];
-		}
-		data[pool][group][id].push({
-		    text: media_set,
-		    uuid,
-		    ctime,
-		    leaf: true,
-		});
 	    }
 
 	    let list = [];
 
-	    for (const [pool, groups] of Object.entries(data)) {
-		let pool_entry = {
+	    for (const [pool, media_sets] of Object.entries(data)) {
+		let pool_entry = Ext.create('Ext.data.TreeModel', {
 		    text: pool,
 		    leaf: false,
-		    children: [],
-		};
-		for (const [group, ids] of Object.entries(groups)) {
-		    let group_entry = {
-			text: group,
-			iconCls: "fa " + PBS.Utils.get_type_icon_cls(group),
-			leaf: false,
-			children: [],
-		    };
-		    for (const [id, media_sets] of Object.entries(ids)) {
-			let id_entry = {
-			    text: `${group}/${id}`,
-			    leaf: false,
-			    children: media_sets,
-			};
-			group_entry.children.push(id_entry);
-		    }
-		    pool_entry.children.push(group_entry);
+		});
+
+		let children = [];
+
+		for (const media_set of Object.values(media_sets)) {
+		    let entry = Ext.create('Ext.data.TreeModel', media_set);
+		    entry.on('beforeexpand', (node) => me.beforeExpand(node));
+		    children.push(entry);
 		}
+
+		pool_entry.set('children', children);
 		list.push(pool_entry);
 	    }
 
@@ -119,6 +104,58 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
 		Proxmox.Utils.setErrorMask(view, error.toString());
 	    }
 	},
+
+	loadMediaSet: async function(node) {
+	    let me = this;
+	    let view = me.getView();
+
+	    Proxmox.Utils.setErrorMask(view, true);
+	    const media_set = node.data['media-set-uuid'];
+
+	    try {
+		let list = await PBS.Async.api2({
+		    method: 'GET',
+		    url: `/api2/extjs/tape/media/content`,
+		    params: {
+			'media-set': media_set,
+		    },
+		});
+
+		list.result.data.sort((a, b) => a.snapshot.localeCompare(b.snapshot));
+
+		for (let entry of list.result.data) {
+		    entry.text = entry.snapshot;
+		    entry.leaf = true;
+		    entry.children = [];
+		    let iconCls = PBS.Utils.get_type_icon_cls(entry.snapshot);
+		    if (iconCls !== '') {
+			entry.iconCls = `fa ${iconCls}`;
+		    }
+		    node.appendChild(entry);
+		}
+
+		if (list.result.data.length === 0) {
+		    node.set('leaf', true);
+		}
+
+		node.set('loaded', true);
+		Proxmox.Utils.setErrorMask(view, false);
+		node.expand();
+	    } catch (error) {
+		Proxmox.Utils.setErrorMask(view, error.toString());
+	    }
+	},
+
+	beforeExpand: function(node, e) {
+	    let me = this;
+	    if (node.isLoaded()) {
+		return true;
+	    }
+
+	    me.loadMediaSet(node);
+
+	    return false;
+	},
     },
 
     listeners: {
@@ -128,8 +165,8 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
     store: {
 	data: [],
 	sorters: function(a, b) {
-	    if (a.data.leaf && b.data.leaf) {
-		return a.data.ctime - b.data.ctime;
+	    if (a.data.is_media_set && b.data.is_media_set) {
+		return a.data['media-set-ctime'] - b.data['media-set-ctime'];
 	    } else {
 		return a.data.text.localeCompare(b.data.text);
 	    }
@@ -161,14 +198,26 @@ Ext.define('PBS.TapeManagement.BackupOverview', {
     columns: [
 	{
 	    xtype: 'treecolumn',
-	    text: gettext('Pool/Group/Snapshot/Media Set'),
+	    text: gettext('Pool/Media Set/Snapshot'),
 	    dataIndex: 'text',
 	    sortable: false,
 	    flex: 3,
 	},
+	{
+	    text: gettext('Number of Tapes'),
+	    dataIndex: 'tapes',
+	    sortable: false,
+	    flex: 1,
+	},
+	{
+	    text: gettext('Tape Number'),
+	    dataIndex: 'seq-nr',
+	    sortable: false,
+	    flex: 1,
+	},
 	{
 	    text: gettext('Media Set UUID'),
-	    dataIndex: 'uuid',
+	    dataIndex: 'media-set-uuid',
 	    sortable: false,
 	    flex: 1,
 	},