parse log

main.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

type TPP struct {
	P1 string
	P2 string
	P3 string
}

func (t TPP) String() string {
	return fmt.Sprintf("%s-%s-%s", t.P1, t.P2, t.P3)
}
func (t TPP) Next(s string) TPP {
	return TPP{P1: t.P2, P2: t.P3, P3: s}
}

type userVisit struct {
	user string
	tpp  TPP
}

func (u userVisit) String() string {
	return fmt.Sprintf("%s-%s", u.user, u.tpp.String())
}

func main() {
	f, err := os.Open("input.txt")
	if err != nil {
		panic(fmt.Sprintf("err reading file %v", err))
	}
	s := bufio.NewScanner(f)
	m := make(map[string][]string)
	//lastUserVisit:= make(map[user]TPP)
	for s.Scan() {
		line := s.Text()
		lineItems := strings.Split(line, " ")
		user := lineItems[1]
		page := lineItems[2]
		m[user] = append(m[user], page)

	}
	counters := make(map[TPP]int)
	var max TPP
	var maxVal int
	for _, visits := range m {
		tpp := TPP{}

		for i, visit := range visits {
			tpp = tpp.Next(visit)
			if i < 2 {
				continue
			}
			counters[tpp]++

			if counters[tpp] > maxVal {
				max = tpp
				maxVal = counters[tpp]
			}

		}
	}
	fmt.Println(max)
}