{{ define "where" }}

{{ template "header" $.Package }}

{{ template "import" $ }}

// ID filters vertices based on their identifier.
func ID(id {{ $.ID.Type }}) ent.Predicate {
	return ent.Predicate{
		SQL: func(s *sql.Selector) {
			{{- if $.ID.IsString }}id, _ := strconv.Atoi(id){{- end }}
			s.Where(sql.EQ(s.C({{ $.ID.Constant }}), id))
		},
		Gremlin: func(t *dsl.Traversal) {
			t.HasID(id)
		},
	}
}

{{ range $_, $op := ops $.ID }}
	{{ $r := "id" }}{{ if $op.Variadic }}{{ $r = "ids" }}{{ end }}
	{{ $func := printf "ID%s" $op.Name }}
	// {{ $func }} applies the {{ $op.Name }} predicate on the ID field.
	func {{ $func }}({{ $r }} {{ if $op.Variadic }}...{{ end }}{{ $.ID.Type }}) ent.Predicate {
		return ent.Predicate{
			SQL: func(s *sql.Selector) {
				{{- if $op.Variadic }}
					// if not arguments were provided, append the FALSE constants,
					// since we can't apply "IN ()". This will make this predicate falsy.
					if len({{ $r }}) == 0 {
						s.Where(sql.False())
						return
					}
					v := make([]interface{}, len({{ $r }}))
					for i := range v {
						{{ if $.ID.IsString }}v[i], _ = strconv.Atoi({{ $r }}[i]){{ else }}v[i] = {{ $r }}[i]{{ end }}
					}
				{{- else if $.ID.IsString }}
					v, _ := strconv.Atoi({{ $r }})
				{{- end }}
				s.Where(sql.{{ $op.Name }}(s.C({{ $.ID.Constant }}), v{{ if $op.Variadic }}...{{ end }}))
			},
			Gremlin: func(t *dsl.Traversal) {
				{{- if $op.Variadic }}
					v := make([]interface{}, len({{ $r }}))
					for i := range v {
						v[i] = {{ $r }}[i]
					}
				{{- end }}
				t.HasID(p.{{ $op.Gremlin }}({{ if $op.Variadic }}v...{{ else }}{{ $r }}{{ end }}))
			},
		}
	}
{{ end }}

{{ range $_, $f := $.Fields }}
	{{ $func := pascal $f.Name }}
	// {{ $func }} applies equality check predicate on the {{ quote $f.Name }} field. It's identical to {{ $func }}EQ.
	func {{ $func }}(v {{ $f.Type }}) ent.Predicate {
		return ent.Predicate{
			SQL: func(s *sql.Selector) {
				s.Where(sql.EQ(s.C({{ $f.Constant }}), v))
			},
			Gremlin: func(t *dsl.Traversal) {
				t.Has(Label, {{ $f.Constant }}, p.EQ(v))
			},
		}
	}
{{ end }}

{{ range $_, $f := $.Fields }}
	{{ range $_, $op := (ops $f) }}
	{{ $r := "v" }}{{ if $op.Variadic }}{{ $r = "vs" }}{{ end }}
	{{ $func := print (pascal $f.Name) ($op.Name) }}
	// {{ $func }} applies the {{ $op.Name }} predicate on the {{ quote $f.Name }} field.
	func {{ $func }}({{ $r }} {{ if $op.Variadic }}...{{ end }}{{ $f.Type }}) ent.Predicate {
		{{- if $op.Variadic }}
			v := make([]interface{}, len({{ $r }}))
			for i := range v {
				v[i] = {{ $r }}[i]
			}
		{{- end }}
		return ent.Predicate{
			SQL: func(s *sql.Selector) {
				{{- if $op.Variadic }}
					// if not arguments were provided, append the FALSE constants,
					// since we can't apply "IN ()". This will make this predicate falsy.
					if len({{ $r }}) == 0 {
						s.Where(sql.False())
						return
					}
				{{- end }}
				s.Where(sql.{{ $op.Name }}(s.C({{ $f.Constant }}), v{{ if $op.Variadic }}...{{ end }}))
			},
			Gremlin: func(t *dsl.Traversal) {
				t.Has(Label, {{ $f.Constant }}, p.{{ $op.Gremlin }}(v{{ if $op.Variadic }}...{{ end }}))
			},
		}
	}
	{{ end }}
{{ end }}

{{ range $_, $e := $.Edges }}
	{{ $func := pascal $e.Name | printf "Has%s" }}
	{{ $label := $e.Constant }}
	{{ $direction := "Out" }}
	{{ $inverse_direction := "In" }}
	{{ if $e.IsInverse }}
		{{	$direction = "In" }}
		{{ $inverse_direction = "Out" }}
		{{/* avoid circular dependecies */}}
		{{ $label = $e.InverseConstant }}
	{{ end }}
	// {{ $func }} applies the HasEdge predicate on the {{ quote $e.Name }} edge.
	func {{ $func }}() ent.Predicate {
		return ent.Predicate{
			SQL: func(s *sql.Selector) {
				{{- if $e.M2M  }}
					t1 := s.Table()
					s.Where(
						sql.In(
							t1.C({{ $.ID.Constant }}),
							sql.Select({{ $e.PKConstant }}[{{ if $e.IsInverse }}1{{ else }}0{{ end }}]).From(sql.Table({{ $e.TableConstant }})),
						),
					)
				{{- else if or $e.M2O (and $e.O2O $e.IsInverse) }}{{/* M2O || (O2O with inverse edge) */}}
					t1 := s.Table()
					s.Where(sql.NotNull(t1.C({{ $e.ColumnConstant }})))
				{{- else }}{{/* O2M || (O2O with assoc edge) */}}
					t1 := s.Table()
					s.Where(
						sql.In(
							t1.C({{ $.ID.Constant }}),
							sql.Select({{ $e.ColumnConstant }}).
								From(sql.Table({{ $e.TableConstant }})).
								Where(sql.NotNull({{ $e.ColumnConstant }})),
						),
					)
				{{- end }}
			},
			Gremlin: func(t *dsl.Traversal) {
				{{- /* if it's an edge with self-reference, take the two vertices */}}
				{{- if $e.SelfRef }}
					t.Both({{ $label }})
				{{- else }}
					t.{{ $direction }}E({{ $label }}).{{ $direction }}V()
				{{- end }}
			},
		}
	}
	{{ $func = printf "%sWith" $func }}
	// {{ $func }} applies the HasEdge predicate on the {{ quote $e.Name }} edge with a given conditions (other predicates).
	func {{ $func }}(preds ...ent.Predicate) ent.Predicate {
		return ent.Predicate{
			SQL: func(s *sql.Selector) {
				{{- if $e.M2M  }}
					{{ $i := 1 }}{{ $j := 0 }}{{- if $e.IsInverse }}{{ $i = 0 }}{{ $j = 1 }}{{ end -}}
					t1 := s.Table()
					t2 := sql.Table(
						{{- if ne $.Table $e.Type.Table -}}
							{{ $e.InverseTableConstant }}
						{{- else -}}
							Table
						{{- end -}}
					)
					t3 := sql.Table({{ $e.TableConstant }})
					t4 := sql.Select(t3.C({{ $e.PKConstant }}[{{ $j }}])).
						From(t3).
						Join(t2).
						On(t3.C({{ $e.PKConstant }}[{{ $i }}]), t2.C({{ $e.Type.ID.Constant }}))
					t5 := sql.Select().From(t2)
					for _, p := range preds {
						p.SQL(t5)
					}
					t4.FromSelect(t5)
					s.Where(sql.In(t1.C({{ $.ID.Constant }}), t4))
				{{- else if or $e.M2O (and $e.O2O $e.IsInverse) }}{{/* M2O || (O2O with inverse edge) */}}
					t1 := s.Table()
					t2 := sql.Select({{ $e.Type.ID.Constant }}).From(sql.Table(
						{{- if ne $.Table $e.Type.Table -}}
							{{ $e.InverseTableConstant }}
						{{- else -}}
							{{ $e.TableConstant }}
						{{- end -}}
					))
					for _, p := range preds {
						p.SQL(t2)
					}
					s.Where(sql.In(t1.C({{ $e.ColumnConstant }}), t2))
				{{- else }}{{/* O2M || (O2O with assoc edge) */}}
					t1 := s.Table()
					t2 := sql.Select({{ $e.ColumnConstant }}).From(sql.Table({{ $e.TableConstant }}))
					for _, p := range preds {
						p.SQL(t2)
					}
					s.Where(sql.In(t1.C({{ $.ID.Constant }}), t2))
				{{- end }}
			},
			Gremlin: func(t *dsl.Traversal) {
				{{- if $e.SelfRef }}{{/* selfref means it should be true in one of the directions */}}
					in, out := __.InV(), __.OutV()
					for _, p := range preds {
						p.Gremlin(in)
						p.Gremlin(out)
					}
					t.Where(
						__.Or(
							__.OutE({{ $label }}).Where(in),
							__.InE({{ $label }}).Where(out),
						),
					)
				{{- else }}
					tr := __.{{ $inverse_direction }}V()
					for _, p := range preds {
						p.Gremlin(tr)
					}
					t.{{ $direction }}E({{ $label }}).Where(tr).{{ $direction }}V()
				{{- end }}
			},
		}
	}
{{ end }}

{{ end }}