StreakController.groovy

def longestStreak() {
        Integer best = 0

        Map<String, Integer> currentStreaks = new HashMap<>()
        Map<String, Date> startStreaks = new HashMap<>()

        Mtch.list().sort { it.matchId }.each { Mtch m ->
            def winner = m.winner.trim().toLowerCase() == "radiant" ? m.radiantTeam : m.direTeam
            def loser = m.winner.trim().toLowerCase() == "radiant" ? m.direTeam : m.radiantTeam

            // Winner first - can be the start of a streak
            Integer currentStreak = currentStreaks.get(winner)
            if (currentStreak) {
                currentStreaks[winner] += 1
            }
            else {
                currentStreaks[winner] = 1
                startStreaks[winner] = m.date
            }

            // Loser next - can only be the end of a streak
            currentStreak = currentStreaks.get(loser)
            if (currentStreak > best) {
                print "Team ${loser} has lost after winning ${currentStreak} in a row. They lost to ${winner} in " +
                        "${m.matchId} - (${m.event}). Their streak was from " +
                        "${startStreaks[loser].format("yyyy-MM-dd")} to ${m.date.format("yyyy-MM-dd")}"

                best = currentStreak
            }
            currentStreaks.remove(loser)
            startStreaks.remove(loser)

        }

        currentStreaks.entrySet().sort{ it.value }.each {
            if (it.value > best) {
                print "Team ${it.key} has not yet lost after winning ${it.value} in a row. Their " +
                        "streak was from ${startStreaks[it.key]} to ${new Date().format("yyyy-MM-dd")}"

                best = it.value
            }
        }
        []
    }

    def longStreaks() {
        final Integer THRESHOLD = 15
        Map<String, Integer> currentStreaks = new HashMap<>()
        Map<String, Date> startStreaks = new HashMap<>()

        Mtch.list().sort { it.matchId }.each { Mtch m ->
            def winner = m.winner.trim().toLowerCase() == "radiant" ? m.radiantTeam : m.direTeam
            def loser = m.winner.trim().toLowerCase() == "radiant" ? m.direTeam : m.radiantTeam

            // Winner first - can be the start of a streak
            Integer currentStreak = currentStreaks.get(winner)
            if (currentStreak) {
                currentStreaks[winner] += 1
            }
            else {
                currentStreaks[winner] = 1
                startStreaks[winner] = m.date
            }

            // Loser next - can only be the end of a streak
            currentStreak = currentStreaks.get(loser)
            if (currentStreak > THRESHOLD) {
                print "Team ${loser} has lost after winning ${currentStreak} in a row. They lost to ${winner} in " +
                        "${m.matchId} - (${m.event}). Their streak was from " +
                        "${startStreaks[loser].format("yyyy-MM-dd")} to ${m.date.format("yyyy-MM-dd")}"
            }
            currentStreaks.remove(loser)
            startStreaks.remove(loser)
        }

        currentStreaks.entrySet().sort{ it.value }.each {
            if (it.value > THRESHOLD) {
                print "Team ${it.key} has not yet lost, after winning ${it.value} in a row. Their " +
                        "streak was from ${startStreaks[it.key]} to ${new Date().format("yyyy-MM-dd")}"
            }
        }
        []
    }