/*
Copyright © The ESO 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

    https://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 locks

import (
	"strings"
	"testing"
)

func TestTryLock(t *testing.T) {
	t.Parallel()

	providerName := "test-provider"
	secretName := "test-secret"

	tests := []struct {
		desc       string
		preprocess func() chan error
		expected   string
	}{
		{
			desc: "No conflict occurs and hold lock successfully",
			preprocess: func() chan error {
				ch := make(chan error)
				go func() {
					ch <- nil
				}()
				return ch
			},
			expected: "",
		},
		{
			desc: "Conflict occurs and cannot hold lock",
			preprocess: func() chan error {
				ch := make(chan error)
				go func() {
					_, err := TryLock(providerName, secretName)
					ch <- err
				}()
				return ch
			},
			expected: "failed to acquire lock: provider: test-provider, secret: test-secret: unable to access secret since it is locked",
		},
	}

	for _, tc := range tests {
		t.Run(tc.desc, func(t *testing.T) {
			// Evacuate the sharedLocks temporarily
			tmp := sharedLocks
			sharedLocks = &secretLocks{}
			defer func() {
				sharedLocks = tmp
			}()

			ch := tc.preprocess()

			err := <-ch
			if err != nil {
				t.Fatalf("preprocessing failed: %v", err)
			}

			_, got := TryLock(providerName, secretName)
			if got != nil {
				if tc.expected == "" {
					t.Fatalf("received an unexpected error: %v", got)
				}

				if !strings.Contains(got.Error(), tc.expected) {
					t.Fatalf("error %q is supposed to contain %q", got, tc.expected)
				}
				return
			}

			if tc.expected != "" {
				t.Fatal("expected to receive an error but got nil")
			}
		})
	}
}
