From ef205e009f21faaf6a178a2f729d3d63b88bf5ae Mon Sep 17 00:00:00 2001
From: xlune <ichikawa@xlune.com>
Date: Mon, 28 May 2018 16:16:17 +0900
Subject: [PATCH] Add kadai4

---
 kadai4/xlune/main.go                 |  12 +++
 kadai4/xlune/omikuji/omikuji.go      | 115 +++++++++++++++++++++++++++
 kadai4/xlune/omikuji/omikuji_test.go |  50 ++++++++++++
 3 files changed, 177 insertions(+)
 create mode 100644 kadai4/xlune/main.go
 create mode 100644 kadai4/xlune/omikuji/omikuji.go
 create mode 100644 kadai4/xlune/omikuji/omikuji_test.go

diff --git a/kadai4/xlune/main.go b/kadai4/xlune/main.go
new file mode 100644
index 0000000..d753ed5
--- /dev/null
+++ b/kadai4/xlune/main.go
@@ -0,0 +1,12 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/xlune/dojo1/kadai4/xlune/omikuji"
+)
+
+func main() {
+	http.HandleFunc("/", omikuji.Handler)
+	http.ListenAndServe(":8080", nil)
+}
diff --git a/kadai4/xlune/omikuji/omikuji.go b/kadai4/xlune/omikuji/omikuji.go
new file mode 100644
index 0000000..c9f50f1
--- /dev/null
+++ b/kadai4/xlune/omikuji/omikuji.go
@@ -0,0 +1,115 @@
+package omikuji
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// Fortune おみくじ結果タイプ
+type Fortune int
+
+// JSONTime JSON出力時間
+type JSONTime struct {
+	time.Time
+}
+
+const (
+	// Kyo 凶
+	Kyo Fortune = iota
+	// Kichi 吉
+	Kichi
+	// Chukichi 中吉
+	Chukichi
+	// Daikichi 大吉
+	Daikichi
+)
+
+// Result 返却データ
+type Result struct {
+	Label string   `json:"label"`
+	Type  Fortune  `json:"type"`
+	Date  JSONTime `json:"date"`
+}
+
+// MarshalJSON JSON文字列生成
+func (t JSONTime) MarshalJSON() ([]byte, error) {
+	timeStr := fmt.Sprintf("\"%s\"", t.Time.Format("2006-01-02 15:04:05"))
+	return []byte(timeStr), nil
+}
+
+// UnmarshalJSON JSON文字列生成パース
+func (t *JSONTime) UnmarshalJSON(data []byte) (err error) {
+	timeObj, err := strToTime(strings.Trim(string(data), "\""))
+	if err != nil {
+		return err
+	}
+	t.Time = timeObj
+	return nil
+}
+
+// Handler ハンドラ実装
+func Handler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+
+	dateStr, ok := r.URL.Query()["date"]
+	dateTime := time.Now()
+
+	if ok && len(dateStr) > 0 {
+		t, err := strToTime(dateStr[0])
+		if err == nil {
+			dateTime = t
+		}
+	}
+
+	fortune := getFortune(dateTime)
+	result := Result{
+		Type:  fortune,
+		Label: getLabel(fortune),
+		Date:  JSONTime{dateTime},
+	}
+
+	if err := json.NewEncoder(w).Encode(result); err != nil {
+		log.Println("Error:", err)
+	}
+}
+
+func getFortune(t time.Time) Fortune {
+	// 1/1 - 1/3 は大吉
+	if t.Month() == time.January && t.Day() <= 3 {
+		return Daikichi
+	}
+	// Seed指定でランダム選択
+	rand.Seed(t.UnixNano())
+	n := rand.Intn(4)
+	return Fortune(n)
+}
+
+func getLabel(f Fortune) string {
+	switch f {
+	case Kichi:
+		return "吉"
+	case Chukichi:
+		return "中吉"
+	case Daikichi:
+		return "大吉"
+	default:
+		return "凶"
+	}
+}
+
+func strToTime(str string) (time.Time, error) {
+	t, err := time.Parse("2006-01-02 15:04:05", str)
+	if err != nil {
+		t, err = time.Parse("2006/01/02 15:04:05", str)
+		if err != nil {
+			return time.Time{}, err
+		}
+	}
+	return t, nil
+}
diff --git a/kadai4/xlune/omikuji/omikuji_test.go b/kadai4/xlune/omikuji/omikuji_test.go
new file mode 100644
index 0000000..b322f52
--- /dev/null
+++ b/kadai4/xlune/omikuji/omikuji_test.go
@@ -0,0 +1,50 @@
+package omikuji_test
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/xlune/dojo1/kadai4/xlune/omikuji"
+)
+
+var handlerTests = []struct {
+	date    string
+	fortune omikuji.Fortune
+}{
+	{"2017-01-01 00:00:00", omikuji.Daikichi},
+	{"2017-01-01 23:59:59", omikuji.Daikichi},
+	{"2017-01-02 00:00:00", omikuji.Daikichi},
+	{"2017-01-02 23:59:59", omikuji.Daikichi},
+	{"2017-01-03 00:00:00", omikuji.Daikichi},
+	{"2017-01-03 23:59:59", omikuji.Daikichi},
+	{"2018-04-01 01:23:45", omikuji.Chukichi},
+	{"2019-08-08 22:23:45", omikuji.Kyo},
+	{"2020-10-06 10:10:10", omikuji.Daikichi},
+	{"2021-12-22 11:11:09", omikuji.Kichi},
+}
+
+func TestHandler(t *testing.T) {
+	for _, h := range handlerTests {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest("GET", "/", nil)
+		q := r.URL.Query()
+		q.Add("date", h.date)
+		r.URL.RawQuery = q.Encode()
+		omikuji.Handler(w, r)
+		rw := w.Result()
+		defer rw.Body.Close()
+		if rw.StatusCode != http.StatusOK {
+			t.Fatal("unexpected status code")
+		}
+		var res omikuji.Result
+		dec := json.NewDecoder(rw.Body)
+		if err := dec.Decode(&res); err != nil {
+			t.Fatal("json decode error")
+		}
+		if res.Type != h.fortune {
+			t.Fatal("unexpected error")
+		}
+	}
+}