log.swift

//  Copyright © 2020 Michael Gubik. All rights reserved. Created on 2020-05-16.

import Foundation
#if TEST
import Sentry
#endif

// maybe look into os_log: https://stackoverflow.com/a/25951564/11588848

private enum LogLevel: String {
    case info = "infø"
    case warn = "warn"
    case error = "errør"
}

private var runtimeFingerprint = UUID().uuidString

public func log(_ any: Any? = nil, function: String = #function, file: String = #file, line: Int = #line) {
    log(level: .info, any, function: function, file: file, line: line)
}

public func logWarn(_ any: Any? = nil, function: String = #function, file: String = #file, line: Int = #line) {
    log(level: .warn, any, function: function, file: file, line: line)
}

public func logError(_ any: Any? = nil, function: String = #function, file: String = #file, line: Int = #line) {
    log(level: .error, any, function: function, file: file, line: line)
}

public func logSubmit() {
    #if TEST
    let event = Event(level: .info)
    let date = DateFormatter.isoDateFormatter.string(from: Date())
    event.message = "operation start - logSubmit - \(date)"
    event.fingerprint = [runtimeFingerprint]
    SentrySDK.capture(event: event)
    #endif
}

private func log(level: LogLevel, _ any: Any?, function: String, file: String, line: Int) {
    let logLevel = level
    let message = String(describing: any ?? "")
    let time = DateFormatter.debugLogTimeFormatter.string(from: Date())
    let file = NSURL(fileURLWithPath: file).lastPathComponent ?? "nil"
    let level = level.rawValue.uppercased() + emoji(for: level)
    let sep = message.isEmpty ? "" : ">>"
    let numLeadingSpaces = message.prefix(while: { $0 == " " }).count
    let prompt = "[\(level)] \(time) \(function) \(file):\(line)] \(sep) "
    let paddingForNewlines = String.init(repeating: " ", count: numLeadingSpaces + prompt.count)
    let indentedMessage = message.replacingOccurrences(of: "\n", with: "\n\(paddingForNewlines)")
    print("\(prompt)\(indentedMessage)")
    
    #if TEST
    if logLevel == .error {
        let event = Event(level: .error)
        event.message = "\(time) \(function) \(file):\(line)] \(sep) \(message)"
        SentrySDK.capture(event: event)
    } else {
        let crumb = Breadcrumb(level: logLevelToSentryLevel(logLevel), category: "")
        crumb.message = "\(time) \(function) \(file):\(line)] \(sep) \(message)"
        SentrySDK.addBreadcrumb(crumb: crumb)
    }
    #endif
}

private func emoji(for logLevel: LogLevel) -> String {
    switch logLevel {
    case .warn:
        return "⚠️"
    case .error:
        return "🛑"
    default:
        return ""
    }
}

#if TEST
private func logLevelToSentryLevel(_ logLevel: LogLevel) -> SentryLevel {
    var sentryLevel = SentryLevel.none
    switch logLevel {
    case .info:
        sentryLevel = .info
    case .warn:
        sentryLevel = .warning
    case .error:
        sentryLevel = .error
    default:
        break
    }
    return sentryLevel
}
#endif

private extension DateFormatter {
    static let debugLogTimeFormatter: DateFormatter  = {
        let timeFormatter = DateFormatter()
        timeFormatter.dateFormat = "HH:mm:ss.SSS"
        return timeFormatter
    }()
    
    #if TEST
    static let isoDateFormatter: DateFormatter  = {
        let timeFormatter = DateFormatter()
        timeFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
        return timeFormatter
    }()
    #endif
}