service.go

// Copyright 2021 Saferwall. All rights reserved.
// Use of this source code is governed by Apache v2 license
// license that can be found in the LICENSE file.

package activity

import (
	"context"
	"encoding/json"
	"time"

	"github.com/saferwall/saferwall-api/internal/entity"
	"github.com/saferwall/saferwall-api/pkg/log"
)

// Service encapsulates usecase logic for users.
type Service interface {
	Get(ctx context.Context, id string, fields []string) (Activity, error)
	Query(ctx context.Context, offset, limit int) ([]interface{}, error)
	Count(ctx context.Context) (int, error)
	Create(ctx context.Context, input CreateActivityRequest) (Activity, error)
	Update(ctx context.Context, id string, input UpdateActivityRequest) (Activity, error)
	Delete(ctx context.Context, id string) (Activity, error)
	DeleteWith(ctx context.Context, kind, username, target string) error
}

// Activity represents the data about an activity.
type Activity struct {
	entity.Activity
}

type service struct {
	repo   Repository
	logger log.Logger
}

// CreateActivityRequest represents a user creation request.
type CreateActivityRequest struct {
	Kind     string `json:"kind" validate:"required,alpha"`
	Username string `json:"username" validate:"required,alpha"`
	Target   string `json:"target" validate:"required,alpha"`
	Source   string `json:"src" validate:"required,alpha"`
}

// UpdateActivityRequest represents a user update request.
type UpdateActivityRequest struct {
	Target string `json:"target" validate:"required,alpha"`
}

// NewService creates a new user service.
func NewService(repo Repository, logger log.Logger) Service {
	return service{repo, logger}
}

// Get returns the user with the specified user ID.
func (s service) Get(ctx context.Context, id string, fields []string) (Activity, error) {
	activity, err := s.repo.Get(ctx, id, fields)
	if err != nil {
		return Activity{}, err
	}
	return Activity{activity}, nil
}

// Create creates a new activity.
func (s service) Create(ctx context.Context, req CreateActivityRequest) (
	Activity, error) {

	id := entity.ID()
	now := time.Now()
	err := s.repo.Create(ctx, entity.Activity{
		ID:        id,
		Kind:      req.Kind,
		Type:      "activity",
		Username:  req.Username,
		Target:    req.Target,
		Timestamp: now.Unix(),
		Source:    req.Source,
	})
	if err != nil {
		return Activity{}, err
	}
	return s.Get(ctx, id, nil)
}

// Update updates the activity with the specified ID.
func (s service) Update(ctx context.Context, id string, req UpdateActivityRequest) (
	Activity, error) {

	activity, err := s.Get(ctx, id, nil)
	if err != nil {
		return activity, err
	}

	data, err := json.Marshal(req)
	if err != nil {
		return activity, err
	}
	err = json.Unmarshal(data, &activity)
	if err != nil {
		return activity, err
	}

	// check if activity.Username == id
	if err := s.repo.Update(ctx, id, activity.Activity); err != nil {
		return activity, err
	}

	return activity, nil
}

// Delete deletes the activity with the specified ID.
func (s service) Delete(ctx context.Context, id string) (Activity, error) {
	activity, err := s.Get(ctx, id, nil)
	if err != nil {
		return Activity{}, err
	}
	if err = s.repo.Delete(ctx, id); err != nil {
		return Activity{}, err
	}
	return activity, nil
}

// Count returns the number of activities.
func (s service) Count(ctx context.Context) (int, error) {
	return s.repo.Count(ctx)
}

// Query returns the activities with the specified offset and limit.
func (s service) Query(ctx context.Context, offset, limit int) (
	[]interface{}, error) {

	result, err := s.repo.Query(ctx, offset, limit)
	if err != nil {
		return nil, err
	}
	return result, nil
}

// Delete an activity given its kind, username and target.
func (s service) DeleteWith(ctx context.Context, kind, username, target string) error {
	err := s.repo.DeleteWith(ctx, kind, username, target)
	return err
}