// Copyright 2021 TiKV Project Authors.
//
// 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 assertutil

import "github.com/stretchr/testify/require"

// Checker accepts the injection of check functions and context from test files.
// Any check function should be set before usage unless the test will fail.
type Checker struct {
	IsNil   func(obtained any)
	FailNow func()
}

// NewChecker creates Checker.
func NewChecker() *Checker {
	return &Checker{}
}

// CheckerWithNilAssert creates Checker with nil assert function.
func CheckerWithNilAssert(re *require.Assertions) *Checker {
	checker := NewChecker()
	checker.FailNow = func() {
		re.FailNow("should be nil")
	}
	checker.IsNil = func(obtained any) {
		re.Nil(obtained)
	}
	return checker
}

// AssertNil calls the injected IsNil assertion.
func (c *Checker) AssertNil(obtained any) {
	if c.IsNil == nil {
		c.FailNow()
		return
	}
	c.IsNil(obtained)
}