// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package target

import (
	"database/sql"
	"slices"
	"testing"
)

// TestPostgreSQLRegistration checks if postgres driver
// is registered and fails otherwise.
func TestPostgreSQLRegistration(t *testing.T) {
	var found bool
	if slices.Contains(sql.Drivers(), "postgres") {
		found = true
	}
	if !found {
		t.Fatal("postgres driver not registered")
	}
}

func TestPsqlTableNameValidation(t *testing.T) {
	validTables := []string{"táblë", "table", "TableName", "\"Table name\"", "\"✅✅\"", "table$one", "\"táblë\""}
	invalidTables := []string{"table name", "table \"name\"", "✅✅", "$table$"}

	for _, name := range validTables {
		if err := validatePsqlTableName(name); err != nil {
			t.Errorf("Should be valid: %s - %s", name, err)
		}
	}
	for _, name := range invalidTables {
		if err := validatePsqlTableName(name); err != errInvalidPsqlTablename {
			t.Errorf("Should be invalid: %s - %s", name, err)
		}
	}
}

func TestQuoteConnParam(t *testing.T) {
	testCases := []struct {
		value    string
		expected string
	}{
		{"localhost", "'localhost'"},
		{"5432", "'5432'"},
		// The reason this function exists: parameters are whitespace
		// separated, so an unquoted space starts a new keyword.
		{"pass word", "'pass word'"},
		{"it's", `'it\'s'`},
		{`back\slash`, `'back\\slash'`},
		{`'; host=evil.example.com; x='`, `'\'; host=evil.example.com; x=\''`},
		{"", "''"},
	}
	for _, testCase := range testCases {
		if got := quoteConnParam(testCase.value); got != testCase.expected {
			t.Errorf("quoteConnParam(%q) = %s, expected %s", testCase.value, got, testCase.expected)
		}
	}
}