/*
Copyright 2021 The Karmada 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 interpreter

import (
	"encoding/json"
	"net/http"

	"gomodules.xyz/jsonpatch/v2"

	configv1alpha1 "github.com/karmada-io/karmada/pkg/apis/config/v1alpha1"
)

// Errored creates a new Response for error-handling a request.
func Errored(code int32, err error) Response {
	return Response{
		ResourceInterpreterResponse: configv1alpha1.ResourceInterpreterResponse{
			Successful: false,
			Status: &configv1alpha1.RequestStatus{
				Code:    code,
				Message: err.Error(),
			},
		},
	}
}

// Succeeded constructs a response indicating the given operation is handled successfully.
func Succeeded(msg string) Response {
	return ValidationResponse(true, msg)
}

// ValidationResponse returns a response for handle a interpret request.
func ValidationResponse(successful bool, msg string) Response {
	code := http.StatusForbidden
	if successful {
		code = http.StatusOK
	}
	return Response{
		ResourceInterpreterResponse: configv1alpha1.ResourceInterpreterResponse{
			Successful: successful,
			Status: &configv1alpha1.RequestStatus{
				Code:    int32(code),
				Message: msg,
			},
		},
	}
}

// PatchResponseFromRaw takes 2 byte arrays and returns a new response with patch.
func PatchResponseFromRaw(original, current []byte) Response {
	patches, err := jsonpatch.CreatePatch(original, current)
	if err != nil {
		return Errored(http.StatusInternalServerError, err)
	}

	if len(patches) == 0 {
		return Succeeded("")
	}

	patch, err := json.Marshal(patches)
	if err != nil {
		return Errored(http.StatusInternalServerError, err)
	}

	patchType := configv1alpha1.PatchTypeJSONPatch
	return Response{
		ResourceInterpreterResponse: configv1alpha1.ResourceInterpreterResponse{
			Successful: true,
			Patch:      patch,
			PatchType:  &patchType,
		},
	}
}