// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.

package mixin

import (
	"time"

	"github.com/facebookincubator/ent"
	"github.com/facebookincubator/ent/schema/field"
)

// Schema is the default implementation for the ent.Mixin interface.
// It should be embedded in end-user mixin as follows:
//
//	type M struct {
//		mixin.Schema
//	}
//
type Schema struct{}

// Fields of the mixin.
func (Schema) Fields() []ent.Field { return nil }

// Edges of the mixin.
func (Schema) Edges() []ent.Edge { return nil }

// Indexes of the mixin.
func (Schema) Indexes() []ent.Index { return nil }

// Hooks of the mixin.
func (Schema) Hooks() []ent.Hook { return nil }

// time mixin must implement `Mixin` interface.
var _ ent.Mixin = (*Schema)(nil)

// CreateTime adds created at time field.
type CreateTime struct{ Schema }

// Fields of the create time mixin.
func (CreateTime) Fields() []ent.Field {
	return []ent.Field{
		field.Time("create_time").
			Default(time.Now).
			Immutable(),
	}
}

// create time mixin must implement `Mixin` interface.
var _ ent.Mixin = (*CreateTime)(nil)

// UpdateTime adds updated at time field.
type UpdateTime struct{ Schema }

// Fields of the update time mixin.
func (UpdateTime) Fields() []ent.Field {
	return []ent.Field{
		field.Time("update_time").
			Default(time.Now).
			UpdateDefault(time.Now).
			Immutable(),
	}
}

// create time mixin must implement `Mixin` interface.
var _ ent.Mixin = (*UpdateTime)(nil)

// Time composes create/update time mixin.
type Time struct{ Schema }

// Fields of the time mixin.
func (Time) Fields() []ent.Field {
	return append(
		CreateTime{}.Fields(),
		UpdateTime{}.Fields()...,
	)
}

// time mixin must implement `Mixin` interface.
var _ ent.Mixin = (*Time)(nil)