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import java.util.regex._
import java.io._
import scala.io.Source
import scala.collection.mutable.Map

class AccumulatedTime(var instances: Int, var totalTime: Int, var viewTime: Int, var dbTime: Int) {
    def addInstance(total: Int, view: Int, db: Int) {
        instances += 1
        totalTime += total
        viewTime += view
        dbTime += db
    }

    def avgTime = totalTime.toFloat / instances
    def avgViewTime = viewTime.toFloat / instances
    def avgDbTime = dbTime.toFloat / instances

     override def toString = "Total Time: " + totalTime + "ms (View: " + viewTime +"ms DB:" + dbTime + "ms )"
     def avgToString =  "Average Time: " + avgTime + "ms (View: " + avgViewTime +"ms DB:" + avgDbTime + "ms )"
}

object LogParser {
    def main(args: Array[String]) {
        val filename = args(0)
        if(filename != null){
            println("Parsing " + filename)
            parseLogFile(filename)
        }
    }

    def parseLogFile(filename: String) {
        val results = parseLogFileToMap(filename)
        outputCompiledResults(results)
    }

    def outputCompiledResults(results: Map[String, AccumulatedTime]){
        println("Total URIs: " + results.size)

        results.foreach({
                case(uri, time) => {
                        println(uri + " => " + time.instances)
                        println("\t" + time)
                        println("\t" + time.avgToString)

                    }
            })
    }

    def parseLogFileToMap(filename: String): Map[String, AccumulatedTime] = {
        val p = Pattern.compile("Completed in (\\d+)ms \\(View: (\\d+), DB: (\\d+)\\) \\| (\\d+) OK \\[http://app.domain.com(.*)\\?")

        // Pattern is this: "Completed in 100ms (View: 25, DB: 75) | 200 OK [http://app.domain.com?params=here]"

        val times = Map[String, AccumulatedTime]()

        def parseLine(pattern: Pattern, line: String){

            // For each log entry do this
            val m = p.matcher(line)
            if(m.find){
                val totalTime = m.group(1).toInt
                val viewTime = m.group(2).toInt
                val dbTime = m.group(3).toInt
                val responseCode = m.group(4)
                val uri = m.group(5)

                if(times.contains(uri)) {
                    times(uri).addInstance(totalTime, viewTime, dbTime)
                } else {
                    times(uri) = new AccumulatedTime(1, totalTime, viewTime, dbTime)
                }
            }
        }

        val fstream = new FileInputStream(filename)
        val in = new DataInputStream(fstream)
        val br = new BufferedReader(new InputStreamReader(in))

        def readLine(reader: BufferedReader) {
            val line = reader.readLine
            if(line == null){
                println("Finished parse.")
            } else {
                parseLine(p, line)
                readLine(reader)
            }

        }
        readLine(br)
        in.close()

        times

    }

}