package fixture

import "fmt"

// Not compiled. MV-N2's format, with its list made by a package helper or
// read from a string field. Each carries an error's text, or text the gate
// cannot derive, and no row vouches for that.

func detail(err error) string {
	return err.Error()
}

func viaHelper(w int, to string, err error) {
	jsonError(w, 400, fmt.Sprintf("region %s is not one of this app's regions: %s", to, detail(err)))
}

func viaHelperConcat(w int, to string, err error) {
	jsonError(w, 400, "region "+to+" is not one of this app's regions: "+detail(err))
}

// A helper whose return the gate cannot derive: the receiver is shadowed, so
// the gate cannot tell which describe runs.
type local struct{}

func (local) describe() string { return "a recorded sentence" }

func opaque(x local, y thing) string {
	if x := y; x != nil {
		return x.describe()
	}
	return "a recorded sentence"
}

func viaOpaque(w int, to string, x local, y thing) {
	jsonError(w, 400, fmt.Sprintf("region %s is not one of this app's regions: %s", to, opaque(x, y)))
}

// A helper that returns its parameter, bound to an error's text.
func echo(m string) string {
	return m
}

func viaEcho(w int, to string, err error) {
	jsonError(w, 400, fmt.Sprintf("region %s is not one of this app's regions: %s", to, echo(fmt.Sprint(err))))
}

// A string field written from an error's text.
type failure struct{ Detail string }

func record(err error) failure {
	return failure{Detail: err.Error()}
}

func viaField(w int, to string, f failure) {
	jsonError(w, 400, fmt.Sprintf("region %s is not one of this app's regions: %s", to, f.Detail))
}

func viaFieldConcat(w int, to string, f failure) {
	jsonError(w, 400, "region "+to+" is not one of this app's regions: "+f.Detail)
}