// Copyright 2016-2018, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package contract

import (
	"fmt"
)

const assertMsg = "An assertion has failed"

// Assert checks a condition and Fails if it is false.
func Assert(cond bool) {
	if !cond {
		failfast(assertMsg)
	}
}

// Assertf checks a condition and Failfs if it is false, formatting and logging the given message.
func Assertf(cond bool, msg string, args ...interface{}) {
	if !cond {
		failfast(fmt.Sprintf("%v: %v", assertMsg, fmt.Sprintf(msg, args...)))
	}
}

// AssertNoError will Fail if the error is non-nil.
func AssertNoError(err error) {
	if err != nil {
		failfast(err.Error())
	}
}

// AssertNoErrorf will Fail if the error is non-nil, adding the additional log message.
func AssertNoErrorf(err error, msg string, args ...interface{}) {
	if err != nil {
		failfast(fmt.Sprintf("error %v: %v. source error: %v", assertMsg, fmt.Sprintf(msg, args...), err))
	}
}