Context analysis: Co-Occurrence

main/Requests/Analytics/VCCoOccurrence.swift

@@ -0,0 +1,88 @@
+import UIKit
+
+class VCCoOccurrence: UIViewController, UITableViewDataSource {
+	var fqdn: String!
+	private var dataSource: [ContextAnalysisResult] = []
+	
+	@IBOutlet private var tableView: UITableView!
+	@IBOutlet private var timeSegment: UISegmentedControl!
+	private let availableTimes = [0, 5, 15, 30]
+	private var selectedTime = -1 {
+		didSet { logTimeDelta = log(CGFloat(max(2, selectedTime+1))) }
+	}
+	private var logTimeDelta: CGFloat = 1
+	private var logMaxCount: CGFloat = 1
+	
+	override func viewDidLoad() {
+		super.viewDidLoad()
+		selectedTime = Pref.ContextAnalyis.CoOccurrenceTime ?? 5 // calls `didSet` and `logTimeDelta`
+		timeSegment.removeAllSegments() // clear IB values
+		for (i, time) in availableTimes.enumerated() {
+			timeSegment.insertSegment(withTitle: TimeFormat(.abbreviated).from(seconds: time), at: i, animated: false)
+			if time == selectedTime {
+				timeSegment.selectedSegmentIndex = i
+			}
+		}
+		reloadDataSource()
+	}
+	
+	func reloadDataSource() {
+		dataSource = [("Loading …", 0, 0, 0)]
+		logMaxCount = 1
+		tableView.reloadData()
+		let domain = fqdn!
+		let time = Timestamp(selectedTime)
+		DispatchQueue.global().async { [weak self] in
+			guard let db = AppDB, let times = db.dnsLogsUniqTs(domain), times.count > 0 else {
+				return // should never happen, or what did you tap then?
+			}
+			guard let result = db.contextAnalysis(coOccurrence: times, plusMinus: time, exclude: domain) else {
+				return
+			}
+			self?.dataSource = result
+			self?.logMaxCount = log(CGFloat(result.reduce(0) { max($0, $1.count)  }))
+			DispatchQueue.main.sync { [weak self] in
+				self?.tableView.reloadData()
+			}
+		}
+	}
+	
+	@IBAction func didChangeTime(_ sender: UISegmentedControl) {
+		selectedTime = availableTimes[sender.selectedSegmentIndex]
+		Pref.ContextAnalyis.CoOccurrenceTime = selectedTime
+		reloadDataSource()
+	}
+	
+	@IBAction func didClose(_ sender: UIBarButtonItem) {
+		dismiss(animated: true)
+	}
+	
+	
+	// MARK: - Table View Data Source
+	
+	func tableView(_ _: UITableView, numberOfRowsInSection _: Int) -> Int {
+		dataSource.count
+	}
+	
+	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+		let cell = tableView.dequeueReusableCell(withIdentifier: "CoOccurrenceCell") as! CoOccurrenceCell
+		let src = dataSource[indexPath.row]
+		cell.title.text = src.domain
+		cell.rank.text = "\(indexPath.row + 1)."
+		cell.count.text = "\(src.count)"
+		cell.avgdiff.text = String(format: "%.2fs", src.avg)
+		
+		cell.countMeter.percent = (log(CGFloat(src.count)) / logMaxCount)
+		cell.avgdiffMeter.percent = 1 - (log(CGFloat(src.avg + 1)) / logTimeDelta)
+		return cell
+	}
+}
+
+class CoOccurrenceCell: UITableViewCell {
+	@IBOutlet var title: UILabel!
+	@IBOutlet var rank: TagLabel!
+	@IBOutlet var count: TagLabel!
+	@IBOutlet var avgdiff: TagLabel!
+	@IBOutlet var countMeter: MeterBar!
+	@IBOutlet var avgdiffMeter: MeterBar!
+}