package postgres

import "testing"

// TestRebind covers the translation the shared component stores depend on.
// It runs without a database, which matters: it is the one part of the
// PostgreSQL driver that can be tested on a machine without PostgreSQL, and
// a mistake here breaks every statement at once.
func TestRebind(t *testing.T) {
	for name, tc := range map[string]struct{ in, want string }{
		"no placeholders": {
			in:   `SELECT COUNT(*) FROM user_accounts`,
			want: `SELECT COUNT(*) FROM user_accounts`,
		},
		"one placeholder": {
			in:   `SELECT password_hash FROM user_accounts WHERE localpart = ?`,
			want: `SELECT password_hash FROM user_accounts WHERE localpart = $1`,
		},
		"numbered in order": {
			in:   `INSERT INTO user_accounts (localpart, admin) VALUES (?, ?)`,
			want: `INSERT INTO user_accounts (localpart, admin) VALUES ($1, $2)`,
		},
		"past nine": {
			in:   `VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
			want: `VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)`,
		},
		"leaves the escape clause alone": {
			in:   `WHERE localpart LIKE ? ESCAPE '!'`,
			want: `WHERE localpart LIKE $1 ESCAPE '!'`,
		},
	} {
		t.Run(name, func(t *testing.T) {
			if got := rebind(tc.in); got != tc.want {
				t.Errorf("rebind(%q) = %q, want %q", tc.in, got, tc.want)
			}
		})
	}
}

func TestIsUniqueViolationIgnoresOtherErrors(t *testing.T) {
	if isUniqueViolation(nil) {
		t.Error("nil is not a unique violation")
	}
	if isUniqueViolation(errOther{}) {
		t.Error("an unrelated error was reported as a unique violation")
	}
}

type errOther struct{}

func (errOther) Error() string { return "something else went wrong" }