81 lines
2.0 KiB
Swift
81 lines
2.0 KiB
Swift
import Foundation
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let fmtDbl = { String(format: "%10.3f", $0) }
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Task.detached {
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let formatter = DateFormatter()
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formatter.dateFormat = "yyyy-MM-dd"
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let (data, _) = try await URLSession.shared.bytes(from: URL(fileURLWithPath: CommandLine.arguments[1]))
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var rowStats = [(Date, Double, Int)]()
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var invalidPeriods = 0
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var invalidStart: Date?
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var sumFile = 0.0
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var readings = 0
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var longestInvalid = 0
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var longestInvalidStart: Date?
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var longestInvalidEnd: Date?
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for try await line in data.lines {
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let lineSplit = line.components(separatedBy: "\t")
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guard !lineSplit.isEmpty, let date = formatter.date(from: lineSplit[0]) else {
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fatalError("Invalid date \(lineSplit[0])")
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}
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let data = Array(lineSplit.dropFirst())
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let parsed = stride(from: 0, to: data.endIndex, by: 2).map({idx -> (Double, Int) in
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let slice = data[idx..<idx+2]
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return (Double(slice[idx]) ?? 0, Int(slice[idx+1]) ?? 0)
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})
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var sum = 0.0
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var numValid = 0
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for (val, flag) in parsed {
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if flag <= 0 {
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if invalidStart == nil {
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invalidStart = date
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}
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invalidPeriods += 1
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} else {
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if invalidPeriods > longestInvalid {
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longestInvalid = invalidPeriods
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longestInvalidStart = invalidStart
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longestInvalidEnd = date
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}
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sumFile += val
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sum += val
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numValid += 1
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readings += 1
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invalidPeriods = 0
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invalidStart = nil
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}
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}
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if numValid != 0 {
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rowStats.append((date, sum / Double(numValid), parsed.count - numValid))
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}
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}
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for stat in rowStats.lazy.reversed().prefix(5) {
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print("\(stat.0): Average: \(fmtDbl(stat.1)); Valid Readings: \(24 - stat.2); Invalid Readings: \(stat.2)")
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}
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print("""
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Sum File: \(fmtDbl(sumFile))
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Average: \(fmtDbl(sumFile / Double(readings)))
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Readings: \(readings)
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Longest Invalid: \(longestInvalid) (\(longestInvalidStart!) - \(longestInvalidEnd!))
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""")
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exit(0)
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}
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dispatchMain()
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