// 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 ent, DO NOT EDIT.

package ent

import (
	"context"
	"errors"
	"fmt"

	"entgo.io/ent/dialect/gremlin"
	"entgo.io/ent/dialect/gremlin/graph/dsl"
	"entgo.io/ent/dialect/gremlin/graph/dsl/__"
	"entgo.io/ent/dialect/gremlin/graph/dsl/g"
	"entgo.io/ent/dialect/gremlin/graph/dsl/p"
	"entgo.io/ent/entc/integration/gremlin/ent/item"
	"entgo.io/ent/entc/integration/gremlin/ent/predicate"
)

// ItemUpdate is the builder for updating Item entities.
type ItemUpdate struct {
	config
	hooks    []Hook
	mutation *ItemMutation
}

// Where appends a list predicates to the ItemUpdate builder.
func (iu *ItemUpdate) Where(ps ...predicate.Item) *ItemUpdate {
	iu.mutation.Where(ps...)
	return iu
}

// SetText sets the "text" field.
func (iu *ItemUpdate) SetText(s string) *ItemUpdate {
	iu.mutation.SetText(s)
	return iu
}

// SetNillableText sets the "text" field if the given value is not nil.
func (iu *ItemUpdate) SetNillableText(s *string) *ItemUpdate {
	if s != nil {
		iu.SetText(*s)
	}
	return iu
}

// ClearText clears the value of the "text" field.
func (iu *ItemUpdate) ClearText() *ItemUpdate {
	iu.mutation.ClearText()
	return iu
}

// Mutation returns the ItemMutation object of the builder.
func (iu *ItemUpdate) Mutation() *ItemMutation {
	return iu.mutation
}

// Save executes the query and returns the number of nodes affected by the update operation.
func (iu *ItemUpdate) Save(ctx context.Context) (int, error) {
	return withHooks[int, ItemMutation](ctx, iu.gremlinSave, iu.mutation, iu.hooks)
}

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

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

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

// check runs all checks and user-defined validators on the builder.
func (iu *ItemUpdate) check() error {
	if v, ok := iu.mutation.Text(); ok {
		if err := item.TextValidator(v); err != nil {
			return &ValidationError{Name: "text", err: fmt.Errorf(`ent: validator failed for field "Item.text": %w`, err)}
		}
	}
	return nil
}

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

func (iu *ItemUpdate) gremlin() *dsl.Traversal {
	type constraint struct {
		pred *dsl.Traversal // constraint predicate.
		test *dsl.Traversal // test matches and its constant.
	}
	constraints := make([]*constraint, 0, 1)
	v := g.V().HasLabel(item.Label)
	for _, p := range iu.mutation.predicates {
		p(v)
	}
	var (
		rv = v.Clone()
		_  = rv

		trs []*dsl.Traversal
	)
	if value, ok := iu.mutation.Text(); ok {
		constraints = append(constraints, &constraint{
			pred: g.V().Has(item.Label, item.FieldText, value).Count(),
			test: __.Is(p.NEQ(0)).Constant(NewErrUniqueField(item.Label, item.FieldText, value)),
		})
		v.Property(dsl.Single, item.FieldText, value)
	}
	var properties []any
	if iu.mutation.TextCleared() {
		properties = append(properties, item.FieldText)
	}
	if len(properties) > 0 {
		v.SideEffect(__.Properties(properties...).Drop())
	}
	v.Count()
	if len(constraints) > 0 {
		constraints = append(constraints, &constraint{
			pred: rv.Count(),
			test: __.Is(p.GT(1)).Constant(&ConstraintError{msg: "update traversal contains more than one vertex"}),
		})
		v = constraints[0].pred.Coalesce(constraints[0].test, v)
		for _, cr := range constraints[1:] {
			v = cr.pred.Coalesce(cr.test, v)
		}
	}
	trs = append(trs, v)
	return dsl.Join(trs...)
}

// ItemUpdateOne is the builder for updating a single Item entity.
type ItemUpdateOne struct {
	config
	fields   []string
	hooks    []Hook
	mutation *ItemMutation
}

// SetText sets the "text" field.
func (iuo *ItemUpdateOne) SetText(s string) *ItemUpdateOne {
	iuo.mutation.SetText(s)
	return iuo
}

// SetNillableText sets the "text" field if the given value is not nil.
func (iuo *ItemUpdateOne) SetNillableText(s *string) *ItemUpdateOne {
	if s != nil {
		iuo.SetText(*s)
	}
	return iuo
}

// ClearText clears the value of the "text" field.
func (iuo *ItemUpdateOne) ClearText() *ItemUpdateOne {
	iuo.mutation.ClearText()
	return iuo
}

// Mutation returns the ItemMutation object of the builder.
func (iuo *ItemUpdateOne) Mutation() *ItemMutation {
	return iuo.mutation
}

// Where appends a list predicates to the ItemUpdate builder.
func (iuo *ItemUpdateOne) Where(ps ...predicate.Item) *ItemUpdateOne {
	iuo.mutation.Where(ps...)
	return iuo
}

// Select allows selecting one or more fields (columns) of the returned entity.
// The default is selecting all fields defined in the entity schema.
func (iuo *ItemUpdateOne) Select(field string, fields ...string) *ItemUpdateOne {
	iuo.fields = append([]string{field}, fields...)
	return iuo
}

// Save executes the query and returns the updated Item entity.
func (iuo *ItemUpdateOne) Save(ctx context.Context) (*Item, error) {
	return withHooks[*Item, ItemMutation](ctx, iuo.gremlinSave, iuo.mutation, iuo.hooks)
}

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

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

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

// check runs all checks and user-defined validators on the builder.
func (iuo *ItemUpdateOne) check() error {
	if v, ok := iuo.mutation.Text(); ok {
		if err := item.TextValidator(v); err != nil {
			return &ValidationError{Name: "text", err: fmt.Errorf(`ent: validator failed for field "Item.text": %w`, err)}
		}
	}
	return nil
}

func (iuo *ItemUpdateOne) gremlinSave(ctx context.Context) (*Item, error) {
	if err := iuo.check(); err != nil {
		return nil, err
	}
	res := &gremlin.Response{}
	id, ok := iuo.mutation.ID()
	if !ok {
		return nil, &ValidationError{Name: "id", err: errors.New(`ent: missing "Item.id" for update`)}
	}
	query, bindings := iuo.gremlin(id).Query()
	if err := iuo.driver.Exec(ctx, query, bindings, res); err != nil {
		return nil, err
	}
	if err, ok := isConstantError(res); ok {
		return nil, err
	}
	iuo.mutation.done = true
	i := &Item{config: iuo.config}
	if err := i.FromResponse(res); err != nil {
		return nil, err
	}
	return i, nil
}

func (iuo *ItemUpdateOne) gremlin(id string) *dsl.Traversal {
	type constraint struct {
		pred *dsl.Traversal // constraint predicate.
		test *dsl.Traversal // test matches and its constant.
	}
	constraints := make([]*constraint, 0, 1)
	v := g.V(id)
	var (
		rv = v.Clone()
		_  = rv

		trs []*dsl.Traversal
	)
	if value, ok := iuo.mutation.Text(); ok {
		constraints = append(constraints, &constraint{
			pred: g.V().Has(item.Label, item.FieldText, value).Count(),
			test: __.Is(p.NEQ(0)).Constant(NewErrUniqueField(item.Label, item.FieldText, value)),
		})
		v.Property(dsl.Single, item.FieldText, value)
	}
	var properties []any
	if iuo.mutation.TextCleared() {
		properties = append(properties, item.FieldText)
	}
	if len(properties) > 0 {
		v.SideEffect(__.Properties(properties...).Drop())
	}
	if len(iuo.fields) > 0 {
		fields := make([]any, 0, len(iuo.fields)+1)
		fields = append(fields, true)
		for _, f := range iuo.fields {
			fields = append(fields, f)
		}
		v.ValueMap(fields...)
	} else {
		v.ValueMap(true)
	}
	if len(constraints) > 0 {
		v = constraints[0].pred.Coalesce(constraints[0].test, v)
		for _, cr := range constraints[1:] {
			v = cr.pred.Coalesce(cr.test, v)
		}
	}
	trs = append(trs, v)
	return dsl.Join(trs...)
}
