package field

import (
	"html/template"
	"io"
)

// DefaultFieldTemplate is the default template to render fields.
var DefaultFieldTemplate = template.Must(template.New("").Parse(`<input type="{{.Type}}" value="{{.Value}}" name="{{.Name}}" placeholder={{.Placeholder}}{{if .Autocomplete }} autocomplete="{{.Autocomplete}}{{end}}>`))
var PureCSSFieldTemplate = template.Must(template.New("").Parse(`
<div class="pure-control-group"><label for="{{.Name}}">{{.Label}}</label><input type="{{.Type}}" value="{{.Value}}" name="{{.Name}}" id="{{.Name}}" placeholder="{{.Placeholder}}"{{if .Autocomplete }} autocomplete="{{.Autocomplete}}" {{end}}></div>`))

// Field represents a field inside a form.
type Field struct {
	Name string    // Name is the name of the field
	Type InputType // Type is the type of the field. It corresponds to the "name" attribute in html.

	Placeholder string // Value for the "placeholder" attribute
	Label       string // (External) Label for the field. Not used by the default template.

	Autocomplete Autocomplete

	EmptyOnError bool // indicates if the field should be reset on error
}

// fieldContext is passed to the template context
type fieldContext struct {
	Field
	Value string
}

func (field Field) WriteTo(w io.Writer, template *template.Template, value string) {
	if template == nil {
		template = DefaultFieldTemplate
	}
	template.Execute(w, fieldContext{Field: field, Value: value})
}

// CheckboxChecked is the default value of a checked checkbox
const CheckboxChecked = "on"