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ch7/3/ch7_3.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"sort"
+)
+
+type Ranker interface {
+	Ranking() []string
+}
+
+type testWriter struct{}
+
+func (p testWriter) Write(bs []byte) (int, error) {
+	if len(bs) == 0 {
+		return 0, nil
+	}
+	for i := 0; i < len(bs); i++ {
+		fmt.Print(string(bs[i]))
+	}
+	return len(bs), nil
+}
+
+func RankPrinter(ranker Ranker, writer io.Writer) {
+	rankSize := len(ranker.Ranking())
+	for i, teams := range ranker.Ranking() {
+		writer.Write([]byte(teams))
+		if i != rankSize-1 {
+			writer.Write([]byte("\n"))
+		}
+	}
+}
+
+type Team struct {
+	Name    string
+	Players []string
+}
+
+type League struct {
+	name  string
+	Teams map[string]Team
+	Wins  map[string]int
+}
+
+func (l *League) MatchResult(firstTeam string, firstScore int, secondTeam string, secondScore int) {
+	if _, ok := l.Teams[firstTeam]; ok {
+		return
+	}
+	if _, ok := l.Teams[secondTeam]; ok {
+		return
+	}
+	if firstScore == secondScore {
+		return
+	}
+	if firstScore > secondScore {
+		l.Wins[firstTeam]++
+	} else if secondScore > firstScore {
+		l.Wins[secondTeam]++
+	}
+}
+
+func (l League) Ranking() []string {
+	teamRanking := make([]string, 0, len(l.Wins))
+	for winsK := range l.Wins {
+		teamRanking = append(teamRanking, winsK)
+	}
+	sort.Slice(teamRanking, func(i, j int) bool {
+		return l.Wins[teamRanking[i]] < l.Wins[teamRanking[j]]
+	})
+	return teamRanking
+}
+
+func main() {
+	league := League{"newLeague", map[string]Team{}, map[string]int{"first": 1, "second": 2, "third": 6, "fourth": 3, "fifth": 4}}
+	league.MatchResult("third", 5, "second", 4)
+	fmt.Println(league)
+	fmt.Println(league.Ranking())
+	writer := testWriter{}
+	RankPrinter(league, writer)
+}