Implement change order endpoint

server/ajax/list.go

@@ -21,10 +21,6 @@ func (a *Ajax) loadLists(w http.ResponseWriter, r *http.Request) error {
 	})
 }
 
-func (a *Ajax) changeOrder(w http.ResponseWriter, r *http.Request) error {
-	return errors.New("not impl")
-}
-
 func (a *Ajax) addList(w http.ResponseWriter, r *http.Request) error {
 	newList, err := list.New(r)
 	if err != nil {

server/ajax/storage.go

@@ -16,12 +16,18 @@ func (a *Ajax) Cur(r *http.Request) (string, string, []string) {
 	listID := form.Get(r, "list")
 	taskID := form.Get(r, "id")
 	if listID == "" {
-		a.storageGet(path.Join("task", taskID, "map"), &listID)
+		listID, _ = a.taskIDToListID(taskID)
 	}
 	tags, _ := r.URL.Query()["t"]
 	return listID, taskID, tags
 }
 
+func (a *Ajax) taskIDToListID(taskID string) (string, error) {
+	var listID string
+	err := a.storageGet(path.Join("task", taskID, "map"), &listID)
+	return listID, err
+}
+
 func (a *Ajax) storageListLists(filters ...func(t *list.List) bool) ([]*list.List, error) {
 	results, err := a.DB.List(nil, path.Join("list"), path.Join("list", "}"))
 	if err != nil {

server/ajax/task.go

@@ -6,7 +6,9 @@ import (
 	"fmt"
 	"local/todo-server/server/ajax/form"
 	"local/todo-server/server/ajax/task"
+	"log"
 	"net/http"
+	"strconv"
 	"strings"
 )
 
@@ -45,6 +47,10 @@ func (a *Ajax) loadTasks(w http.ResponseWriter, r *http.Request) error {
 	if err != nil {
 		return err
 	}
+	log.Println(listID)
+	for _, task := range tasks {
+		log.Println(task.Index, task.Title)
+	}
 	return json.NewEncoder(w).Encode(map[string]interface{}{"list": tasks})
 }
 
@@ -147,3 +153,56 @@ func (a *Ajax) moveTask(w http.ResponseWriter, r *http.Request) error {
 func (a *Ajax) parseTaskStr(w http.ResponseWriter, r *http.Request) error {
 	return errors.New("not impl")
 }
+
+func (a *Ajax) changeOrder(w http.ResponseWriter, r *http.Request) error {
+	order := form.Get(r, "order")
+	orders := strings.Split(order, "&")
+	sum := 0
+	zero := ""
+	for _, order := range orders {
+		taskIDDelta := strings.Split(order, "=")
+		if len(taskIDDelta) < 2 {
+			continue
+		}
+		taskID := taskIDDelta[0]
+		delta, _ := strconv.Atoi(taskIDDelta[1])
+		if delta < 0 {
+			delta = -1
+		} else {
+			delta = 0
+		}
+		task, err := a.storageGetTask(taskID)
+		if err != nil {
+			return err
+		}
+		listID, err := a.taskIDToListID(taskID)
+		if err != nil {
+			return err
+		}
+		task.Index += delta
+		if err := a.storageSetTask(listID, task); err != nil {
+			return err
+		}
+		if delta == 0 {
+			zero = taskID
+		}
+		sum += delta
+	}
+	if zero == "" || sum == 0 {
+		return nil
+	}
+	task, err := a.storageGetTask(zero)
+	if err != nil {
+		return err
+	}
+	listID, err := a.taskIDToListID(zero)
+	if err != nil {
+		return err
+	}
+	task.Index -= sum
+	if err := a.storageSetTask(listID, task); err != nil {
+		return err
+	}
+	fmt.Fprint(w, `{"total":1}`)
+	return nil
+}

server/ajax/task_test.go

@@ -177,3 +177,33 @@ func TestAjaxMoveTask(t *testing.T) {
 		t.Error(err, task)
 	}
 }
+
+func TestAjaxChangeOrder(t *testing.T) {
+	ajax := mockAjax()
+	ajax.storageSetTask("list", &task.Task{UUID: "b", Title: "c", Index: 5})
+	ajax.storageSetTask("list", &task.Task{UUID: "d", Title: "e", Index: 6})
+	ajax.storageSetTask("list", &task.Task{UUID: "f", Title: "g", Index: 7})
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest("POST", "/", strings.NewReader(`order=b%3d0%26d%3d-1%26f%3d-1%26`))
+	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	ajax.changeOrder(w, r)
+	if v := w.Code; v != http.StatusOK {
+		t.Error(v)
+	}
+	tasks, err := ajax.storageListTasks("list")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(tasks) != 3 {
+		t.Fatal(err)
+	}
+	if tasks[0].UUID != "d" {
+		t.Error(tasks[0])
+	}
+	if tasks[1].UUID != "f" {
+		t.Error(tasks[1])
+	}
+	if tasks[2].UUID != "b" {
+		t.Error(tasks[2])
+	}
+}