package main

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

const (
    opponentRock     string = "A"
    opponentPaper    string = "B"
    opponentScissors string = "C"
)

const (
    myRock     string = "X"
    myPaper    string = "Y"
    myScissors string = "Z"
)

func getShapeScore(shape string) int {
    switch shape {
    case myRock:
        return 1
    case myPaper:
        return 2
    case myScissors:
        return 3
    default:
        return 0
    }
}

func getPairResult(opponentShape string, myShape string) int {
    // both rock
    if opponentShape == opponentRock && myShape == myRock {
        return 3
    }
    // both paper
    if opponentShape == opponentPaper && myShape == myPaper {
        return 3
    }
    // both scissors
    if opponentShape == opponentScissors && myShape == myScissors {
        return 3
    }

    // opponentShape is rock
    if opponentShape == opponentRock && myShape == myPaper {
        return 6
    }
    if opponentShape == opponentRock && myShape == myScissors {
        return 0
    }

    // opponentShape is paper
    if opponentShape == opponentPaper && myShape == myScissors {
        return 6
    }
    if opponentShape == opponentPaper && myShape == myRock {
        return 0
    }

    // opponentShape is scissors
    if opponentShape == opponentScissors && myShape == myRock {
        return 6
    }
    if opponentShape == opponentScissors && myShape == myPaper {
        return 0
    }

    return 0
}

func calculateTotalScore(filename string) int {
    file, err := os.Open(filename)
    if err != nil {
        fmt.Println(err.Error())
        return 0
    }

    defer file.Close()

    var line string
    var totalScore int

    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        line = scanner.Text()

        opponentShape := line[0:1]
        myShape := line[2:3]

        shapeScore := getShapeScore(myShape)

        pairResult := getPairResult(opponentShape, myShape)

        totalScore = totalScore + shapeScore + pairResult
    }

    return totalScore
}

func main() {
    filename := os.Args[2]
    score := calculateTotalScore(filename)

    fmt.Println(score)
}