add model for notification

internal/model/notification.go

@@ -0,0 +1,88 @@
+package model
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+)
+
+type NotificationType int
+
+const (
+	NotificationTypeFollow NotificationType = iota
+	NotificationTypeFollowRequest
+	NotificationTypeMention
+	NotificationTypeReblog
+	NotificationTypeFavourite
+	NotificationTypePoll
+	NotificationTypeStatus
+)
+
+func ParseNotificationType(notificationType string) (NotificationType, error) {
+	switch notificationType {
+	case "follow":
+		return NotificationTypeFollow, nil
+	case "follow_request":
+		return NotificationTypeFollowRequest, nil
+	case "mention":
+		return NotificationTypeMention, nil
+	case "reblog":
+		return NotificationTypeReblog, nil
+	case "favourite":
+		return NotificationTypeFavourite, nil
+	case "poll":
+		return NotificationTypePoll, nil
+	case "status":
+		return NotificationTypeStatus, nil
+	}
+
+	return NotificationType(-1), errors.New("invalid notification type")
+}
+
+func (n NotificationType) String() string {
+	switch n {
+	case NotificationTypeFollow:
+		return "Someone followed you"
+	case NotificationTypeFollowRequest:
+		return "Someone requested to follow you"
+	case NotificationTypeMention:
+		return "Someone mentioned you in their status"
+	case NotificationTypeReblog:
+		return "Someone reposted one of your statuses"
+	case NotificationTypeFavourite:
+		return "Someone liked one of your statuses"
+	case NotificationTypePoll:
+		return "A poll you have voted in (or created) has ended"
+	case NotificationTypeStatus:
+		return "Someone you enabled notifications for has posted a status"
+	}
+
+	return ""
+}
+
+func (n *NotificationType) UnmarshalJSON(data []byte) error {
+	var (
+		value string
+		err   error
+	)
+
+	if err = json.Unmarshal(data, &value); err != nil {
+		return fmt.Errorf("unable to unmarshal the data; %w", err)
+	}
+
+	*n, err = ParseNotificationType(value)
+	if err != nil {
+		return fmt.Errorf("unable to parse %q as a notification type; %w", value, err)
+	}
+
+	return nil
+}
+
+type Notification struct {
+	Account   *Account         `json:"account"`
+	CreatedAt time.Time        `json:"created_at"`
+	ID        string           `json:"id"`
+	Status    *Status          `json:"status"`
+	Type      NotificationType `json:"type"`
+}