package merrors

import (
	"errors"
	"testing"
)

func TestSignupEmailPolicyError(t *testing.T) {
	err := SignupEmailPolicyRejected(SignupEmailPolicyReasonFreeDomain, "gmail.com")
	policyErr, ok := AsSignupEmailPolicyError(err)
	if !ok {
		t.Fatalf("expected signup email policy error")
	}
	if policyErr.Reason() != SignupEmailPolicyReasonFreeDomain {
		t.Fatalf("reason mismatch: got=%q", policyErr.Reason())
	}
	if policyErr.Domain() != "gmail.com" {
		t.Fatalf("domain mismatch: got=%q", policyErr.Domain())
	}
	if !errors.Is(err, ErrSignupEmailPolicyRejected) {
		t.Fatalf("expected signup email policy sentinel")
	}

	reason, ok := Reason(err)
	if !ok {
		t.Fatalf("expected generic reason")
	}
	if reason != SignupEmailPolicyReasonFreeDomain {
		t.Fatalf("generic reason mismatch: got=%q", reason)
	}
}

func TestSignupEmailPolicyReasonNormalization(t *testing.T) {
	for _, reason := range []string{
		SignupEmailPolicyReasonInvalidEmail,
		SignupEmailPolicyReasonDisposableDomain,
		SignupEmailPolicyReasonFreeDomain,
	} {
		if !IsSignupEmailPolicyReason(reason) {
			t.Fatalf("expected supported reason: %q", reason)
		}
	}

	err := SignupEmailPolicyRejected("unexpected_reason", "")
	policyErr, ok := AsSignupEmailPolicyError(err)
	if !ok {
		t.Fatalf("expected signup email policy error")
	}
	if policyErr.Reason() != SignupEmailPolicyReasonInvalidEmail {
		t.Fatalf("unexpected reasons must not leak: got=%q", policyErr.Reason())
	}
}