// 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.

// Code generated by entc, DO NOT EDIT.

package ent

import (
	"context"
	"fmt"

	"github.com/facebook/ent/dialect/gremlin"
	"github.com/facebook/ent/dialect/gremlin/graph/dsl"
	"github.com/facebook/ent/dialect/gremlin/graph/dsl/g"
	"github.com/facebook/ent/entc/integration/gremlin/ent/goods"
	"github.com/facebook/ent/entc/integration/gremlin/ent/predicate"
)

// GoodsUpdate is the builder for updating Goods entities.
type GoodsUpdate struct {
	config
	hooks    []Hook
	mutation *GoodsMutation
}

// Where adds a new predicate for the builder.
func (gu *GoodsUpdate) Where(ps ...predicate.Goods) *GoodsUpdate {
	gu.mutation.predicates = append(gu.mutation.predicates, ps...)
	return gu
}

// Mutation returns the GoodsMutation object of the builder.
func (gu *GoodsUpdate) Mutation() *GoodsMutation {
	return gu.mutation
}

// Save executes the query and returns the number of nodes affected by the update operation.
func (gu *GoodsUpdate) Save(ctx context.Context) (int, error) {
	var (
		err      error
		affected int
	)
	if len(gu.hooks) == 0 {
		affected, err = gu.gremlinSave(ctx)
	} else {
		var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
			mutation, ok := m.(*GoodsMutation)
			if !ok {
				return nil, fmt.Errorf("unexpected mutation type %T", m)
			}
			gu.mutation = mutation
			affected, err = gu.gremlinSave(ctx)
			mutation.done = true
			return affected, err
		})
		for i := len(gu.hooks) - 1; i >= 0; i-- {
			mut = gu.hooks[i](mut)
		}
		if _, err := mut.Mutate(ctx, gu.mutation); err != nil {
			return 0, err
		}
	}
	return affected, err
}

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

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

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

func (gu *GoodsUpdate) gremlinSave(ctx context.Context) (int, error) {
	res := &gremlin.Response{}
	query, bindings := gu.gremlin().Query()
	if err := gu.driver.Exec(ctx, query, bindings, res); err != nil {
		return 0, err
	}
	if err, ok := isConstantError(res); ok {
		return 0, err
	}
	return res.ReadInt()
}

func (gu *GoodsUpdate) gremlin() *dsl.Traversal {
	v := g.V().HasLabel(goods.Label)
	for _, p := range gu.mutation.predicates {
		p(v)
	}
	var (
		trs []*dsl.Traversal
	)
	v.Count()
	trs = append(trs, v)
	return dsl.Join(trs...)
}

// GoodsUpdateOne is the builder for updating a single Goods entity.
type GoodsUpdateOne struct {
	config
	hooks    []Hook
	mutation *GoodsMutation
}

// Mutation returns the GoodsMutation object of the builder.
func (guo *GoodsUpdateOne) Mutation() *GoodsMutation {
	return guo.mutation
}

// Save executes the query and returns the updated entity.
func (guo *GoodsUpdateOne) Save(ctx context.Context) (*Goods, error) {
	var (
		err  error
		node *Goods
	)
	if len(guo.hooks) == 0 {
		node, err = guo.gremlinSave(ctx)
	} else {
		var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
			mutation, ok := m.(*GoodsMutation)
			if !ok {
				return nil, fmt.Errorf("unexpected mutation type %T", m)
			}
			guo.mutation = mutation
			node, err = guo.gremlinSave(ctx)
			mutation.done = true
			return node, err
		})
		for i := len(guo.hooks) - 1; i >= 0; i-- {
			mut = guo.hooks[i](mut)
		}
		if _, err := mut.Mutate(ctx, guo.mutation); err != nil {
			return nil, err
		}
	}
	return node, err
}

// SaveX is like Save, but panics if an error occurs.
func (guo *GoodsUpdateOne) SaveX(ctx context.Context) *Goods {
	node, err := guo.Save(ctx)
	if err != nil {
		panic(err)
	}
	return node
}

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

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

func (guo *GoodsUpdateOne) gremlinSave(ctx context.Context) (*Goods, error) {
	res := &gremlin.Response{}
	id, ok := guo.mutation.ID()
	if !ok {
		return nil, &ValidationError{Name: "ID", err: fmt.Errorf("missing Goods.ID for update")}
	}
	query, bindings := guo.gremlin(id).Query()
	if err := guo.driver.Exec(ctx, query, bindings, res); err != nil {
		return nil, err
	}
	if err, ok := isConstantError(res); ok {
		return nil, err
	}
	_go := &Goods{config: guo.config}
	if err := _go.FromResponse(res); err != nil {
		return nil, err
	}
	return _go, nil
}

func (guo *GoodsUpdateOne) gremlin(id string) *dsl.Traversal {
	v := g.V(id)
	var (
		trs []*dsl.Traversal
	)
	v.ValueMap(true)
	trs = append(trs, v)
	return dsl.Join(trs...)
}
