Adding StatsFileDownloadsTimeIntervalData to contain File Download data.

Author: ScoutHarris

WordPressKit/Time Interval/StatsFileDownloadsTimeIntervalData.swift

@@ -0,0 +1,66 @@
+public struct StatsFileDownloadsTimeIntervalData {
+    public let period: StatsPeriodUnit
+    public let periodEndDate: Date
+    
+    public let totalDownloadsCount: Int
+    public let otherDownloadsCount: Int
+    public let fileDownloads: [StatsFileDownload]
+    
+    public init(period: StatsPeriodUnit,
+                periodEndDate: Date,
+                fileDownloads: [StatsFileDownload],
+                totalDownloadsCount: Int,
+                otherDownloadsCount: Int) {
+        self.period = period
+        self.periodEndDate = periodEndDate
+        self.fileDownloads = fileDownloads
+        self.totalDownloadsCount = totalDownloadsCount
+        self.otherDownloadsCount = otherDownloadsCount
+    }
+}
+
+public struct StatsFileDownload {
+    public let file: String
+    public let downloadCount: Int
+    
+    public init(file: String,
+                downloadCount: Int) {
+        self.file = file
+        self.downloadCount = downloadCount
+    }
+}
+
+extension StatsFileDownloadsTimeIntervalData: StatsTimeIntervalData {
+    public static var pathComponent: String {
+        return "stats/file-downloads"
+    }
+    
+    public static func queryProperties(with date: Date, period: StatsPeriodUnit, maxCount: Int) -> [String: String] {
+        // num = number of periods to include in the query. default: 1.
+        return ["num": String(maxCount)]
+    }
+    
+    public init?(date: Date, period: StatsPeriodUnit, jsonDictionary: [String : AnyObject]) {
+        guard
+            let unwrappedDays = type(of: self).unwrapDaysDictionary(jsonDictionary: jsonDictionary),
+            let fileDownloadsDict = unwrappedDays["files"] as? [[String: AnyObject]]
+            else {
+                return nil
+        }
+        
+        let fileDownloads: [StatsFileDownload] = fileDownloadsDict.compactMap {
+            // TODO: these keys are a total guess. Verify/update when the endpoint is actually live.
+            guard let file = $0["file"] as? String, let downloads = $0["downloads"] as? Int else {
+                return nil
+            }
+            
+            return StatsFileDownload(file: file, downloadCount: downloads)
+        }
+        
+        self.periodEndDate = date
+        self.period = period
+        self.fileDownloads = fileDownloads
+        self.totalDownloadsCount = unwrappedDays["total_downloads"] as? Int ?? 0
+        self.otherDownloadsCount = unwrappedDays["other_downloads"] as? Int ?? 0
+    }
+}