// Copyright (c) Facebook, Inc. and its affiliates. 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.

// Code generated (@generated) by entc, DO NOT EDIT.

package entv2

import (
	"context"
	"fmt"

	"github.com/facebookincubator/ent/dialect/sql"
	"github.com/facebookincubator/ent/entc/integration/migrate/entv2/pet"
	"github.com/facebookincubator/ent/entc/integration/migrate/entv2/predicate"
)

// PetUpdate is the builder for updating Pet entities.
type PetUpdate struct {
	config
	predicates []predicate.Pet
}

// Where adds a new predicate for the builder.
func (pu *PetUpdate) Where(ps ...predicate.Pet) *PetUpdate {
	pu.predicates = append(pu.predicates, ps...)
	return pu
}

// Save executes the query and returns the number of rows/vertices matched by this operation.
func (pu *PetUpdate) Save(ctx context.Context) (int, error) {
	return pu.sqlSave(ctx)
}

// SaveX is like Save, but panics if an error occurs.
func (pu *PetUpdate) SaveX(ctx context.Context) int {
	affected, err := pu.Save(ctx)
	if err != nil {
		panic(err)
	}
	return affected
}

// Exec executes the query.
func (pu *PetUpdate) Exec(ctx context.Context) error {
	_, err := pu.Save(ctx)
	return err
}

// ExecX is like Exec, but panics if an error occurs.
func (pu *PetUpdate) ExecX(ctx context.Context) {
	if err := pu.Exec(ctx); err != nil {
		panic(err)
	}
}

func (pu *PetUpdate) sqlSave(ctx context.Context) (n int, err error) {
	selector := sql.Select(pet.FieldID).From(sql.Table(pet.Table))
	for _, p := range pu.predicates {
		p(selector)
	}
	rows := &sql.Rows{}
	query, args := selector.Query()
	if err = pu.driver.Query(ctx, query, args, rows); err != nil {
		return 0, err
	}
	defer rows.Close()
	var ids []int
	for rows.Next() {
		var id int
		if err := rows.Scan(&id); err != nil {
			return 0, fmt.Errorf("entv2: failed reading id: %v", err)
		}
		ids = append(ids, id)
	}
	if len(ids) == 0 {
		return 0, nil
	}

	tx, err := pu.driver.Tx(ctx)
	if err != nil {
		return 0, err
	}
	if err = tx.Commit(); err != nil {
		return 0, err
	}
	return len(ids), nil
}

// PetUpdateOne is the builder for updating a single Pet entity.
type PetUpdateOne struct {
	config
	id int
}

// Save executes the query and returns the updated entity.
func (puo *PetUpdateOne) Save(ctx context.Context) (*Pet, error) {
	return puo.sqlSave(ctx)
}

// SaveX is like Save, but panics if an error occurs.
func (puo *PetUpdateOne) SaveX(ctx context.Context) *Pet {
	pe, err := puo.Save(ctx)
	if err != nil {
		panic(err)
	}
	return pe
}

// Exec executes the query on the entity.
func (puo *PetUpdateOne) Exec(ctx context.Context) error {
	_, err := puo.Save(ctx)
	return err
}

// ExecX is like Exec, but panics if an error occurs.
func (puo *PetUpdateOne) ExecX(ctx context.Context) {
	if err := puo.Exec(ctx); err != nil {
		panic(err)
	}
}

func (puo *PetUpdateOne) sqlSave(ctx context.Context) (pe *Pet, err error) {
	selector := sql.Select(pet.Columns...).From(sql.Table(pet.Table))
	pet.ID(puo.id)(selector)
	rows := &sql.Rows{}
	query, args := selector.Query()
	if err = puo.driver.Query(ctx, query, args, rows); err != nil {
		return nil, err
	}
	defer rows.Close()
	var ids []int
	for rows.Next() {
		var id int
		pe = &Pet{config: puo.config}
		if err := pe.FromRows(rows); err != nil {
			return nil, fmt.Errorf("entv2: failed scanning row into Pet: %v", err)
		}
		id = pe.ID
		ids = append(ids, id)
	}
	switch n := len(ids); {
	case n == 0:
		return nil, &ErrNotFound{fmt.Sprintf("Pet with id: %v", puo.id)}
	case n > 1:
		return nil, fmt.Errorf("entv2: more than one Pet with the same id: %v", puo.id)
	}

	tx, err := puo.driver.Tx(ctx)
	if err != nil {
		return nil, err
	}
	if err = tx.Commit(); err != nil {
		return nil, err
	}
	return pe, nil
}