package apply

import (
	"fmt"
	"testing"

	"github.com/crossplane/crossplane-runtime/pkg/test"
	"github.com/google/go-cmp/cmp"
	"github.com/pkg/errors"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
)

func TestAddLastAppliedConfig(t *testing.T) {
	cases := map[string]struct {
		reason  string
		obj     runtime.Object
		wantObj runtime.Object
		wantErr error
	}{
		"ErrCannotAccessMetadata": {
			reason:  "An error should be returned if cannot access metadata",
			obj:     testNoMetaObject{},
			wantObj: testNoMetaObject{},
			wantErr: errors.Wrap(fmt.Errorf("object does not implement the Object interfaces"), "cannot access metadata.annotations"),
		},
	}

	for caseName, tc := range cases {
		t.Run(caseName, func(t *testing.T) {
			err := addLastAppliedConfigAnnotation(tc.obj)
			if diff := cmp.Diff(tc.wantObj, tc.obj); diff != "" {
				t.Errorf("\n%s\ngetModifiedConfig(...): -want , +got \n%s\n", tc.reason, diff)
			}
			if diff := cmp.Diff(tc.wantErr, err, test.EquateErrors()); diff != "" {
				t.Errorf("\n%s\ngetModifiedConfig(...): -want , +got \n%s\n", tc.reason, diff)
			}
		})
	}
}

func TestGetOriginalConfig(t *testing.T) {
	objNoAnno := &unstructured.Unstructured{}
	objNoAnno.SetAnnotations(make(map[string]string))

	cases := map[string]struct {
		reason     string
		obj        runtime.Object
		wantConfig string
		wantErr    error
	}{
		"ErrCannotAccessMetadata": {
			reason:  "An error should be returned if cannot access metadata",
			obj:     testNoMetaObject{},
			wantErr: errors.Wrap(fmt.Errorf("object does not implement the Object interfaces"), "cannot access metadata.annotations"),
		},
		"NoAnnotations": {
			reason: "No error should be returned if cannot find last-applied-config annotaion",
			obj:    &unstructured.Unstructured{},
		},
		"LastAppliedConfigAnnotationNotFound": {
			reason: "No error should be returned if cannot find last-applied-config annotaion",
			obj:    objNoAnno,
		},
	}

	for caseName, tc := range cases {
		t.Run(caseName, func(t *testing.T) {
			r, err := getOriginalConfiguration(tc.obj)
			if diff := cmp.Diff(tc.wantConfig, string(r)); diff != "" {
				t.Errorf("\n%s\ngetModifiedConfig(...): -want , +got \n%s\n", tc.reason, diff)
			}
			if diff := cmp.Diff(tc.wantErr, err, test.EquateErrors()); diff != "" {
				t.Errorf("\n%s\ngetModifiedConfig(...): -want , +got \n%s\n", tc.reason, diff)
			}
		})
	}
}