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'use strict';
'require view';
'require fs';
'require ui';

return view.extend({
	load: function() {
		return Promise.all([
			L.resolveDefault(fs.stat('/sbin/logread'), null),
			L.resolveDefault(fs.stat('/usr/sbin/logread'), null)
		]).then(function(stat) {
			var logger = stat[0] ? stat[0].path : stat[1] ? stat[1].path : null;

			return fs.exec_direct(logger, [ '-e', '^' ]).catch(function(err) {
				ui.addNotification(null, E('p', {}, _('Unable to load log data: ' + err.message)));
				return '';
			});
		});
	},

	render: function(logdata) {
		var loglines = logdata.trim().split(/\n/);


		var scrollDownButton = E('button', { 
				'id': 'scrollDownButton',
				'class': 'cbi-button cbi-button-neutral'
			}, _('Scroll to tail', 'scroll to bottom (the tail) of the log file')
		);
		scrollDownButton.addEventListener('click', function() {
			scrollUpButton.focus();
		});

		var scrollUpButton = E('button', { 
				'id' : 'scrollUpButton',
				'class': 'cbi-button cbi-button-neutral'
			}, _('Scroll to head', 'scroll to top (the head) of the log file')
		);
		scrollUpButton.addEventListener('click', function() {
			scrollDownButton.focus();
		});

		return E([], [
			E('h2', {}, [ _('System Log') ]),
			E('div', { 'id': 'content_syslog' }, [
				E('div', {'style': 'padding-bottom: 20px'}, [scrollDownButton]),
				E('textarea', {
					'id': 'syslog',
					'style': 'font-size:12px',
					'readonly': 'readonly',
					'wrap': 'off',
					'rows': loglines.length + 1
				}, [ loglines.join('\n') ]),
				E('div', {'style': 'padding-bottom: 20px'}, [scrollUpButton])
			])
		]);
	},

	handleSaveApply: null,
	handleSave: null,
	handleReset: null
});