{{/*
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.
*/}}

{{/* gotype: entgo.io/ent/entc/gen.Graph */}}

{{ define "dialect/sql/order/signature" -}}
// OrderFunc applies an ordering on the sql selector.
type OrderFunc func(*sql.Selector)

// columnChecker returns a function indicates if the column exists in the given column.
func columnChecker(table string) func(string) error {
	checks := map[string]func(string) bool{
		{{- range $n := $.Nodes }}
			{{ $n.Package }}.Table: {{ $n.Package }}.ValidColumn,
		{{- end }}
	}
	check, ok := checks[table]
	if !ok {
		return func(string) error {
			return fmt.Errorf("unknown table %q", table)
		}
	}
	return func(column string) error {
		if !check(column) {
			return fmt.Errorf("unknown column %q for table %q", column, table)
		}
		return nil
	}
}
{{- end }}

{{ define "dialect/sql/order/func" -}}
	{{- $f := $.Scope.Func -}}
	func(s *sql.Selector) {
		check := columnChecker(s.TableName())
		for _, f := range fields {
			if err := check(f); err != nil {
				s.AddError(&ValidationError{Name: f, err: fmt.Errorf("{{ base $.Config.Package }}: %w", err)})
			}
			s.OrderBy(sql.{{ $f }}(s.C(f)))
		}
	}
{{- end }}

{{/* custom signature for group-by function */}}
{{ define "dialect/sql/group/signature" -}}
	type AggregateFunc func(*sql.Selector) string
{{- end }}

{{ define "dialect/sql/group/as" -}}
	func(s *sql.Selector) string {
			return sql.As(fn(s), end)
	}
{{- end }}

{{ define "dialect/sql/group/func" -}}
	{{- $fn := $.Scope.Func -}}
	{{- $withField := $.Scope.WithField -}}
	func(s *sql.Selector) string {
		{{- if $withField }}
			check := columnChecker(s.TableName())
			if err := check(field); err != nil {
				s.AddError(&ValidationError{Name: field, err: fmt.Errorf("{{ base $.Config.Package }}: %w", err)})
				return ""
			}
		{{- end }}
		return sql.{{ if eq $fn "Mean" }}Avg{{ else }}{{ $fn }}{{ end }}({{ if $withField }}s.C(field){{ else }}"*"{{ end }})
	}
{{- end }}