/*
Copyright 2021 The Dapr 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 standalone

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net"
	"net/http"

	"github.com/dapr/cli/pkg/api"
	"github.com/dapr/cli/utils"
)

// Invoke is a command to invoke a remote or local dapr instance.
func (s *Standalone) Invoke(appID, method string, data []byte, verb string, path string) (string, error) {
	list, err := s.process.List()
	if err != nil {
		return "", err
	}

	for _, lo := range list {
		if lo.AppID == appID {
			url := makeEndpoint(lo, method)
			req, err := http.NewRequest(verb, url, bytes.NewBuffer(data))
			if err != nil {
				return "", err
			}
			req.Header.Set("Content-Type", "application/json")

			var httpc http.Client

			if path != "" {
				httpc.Transport = &http.Transport{
					DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
						return net.Dial("unix", utils.GetSocket(path, appID, "http"))
					},
				}
			}

			r, err := httpc.Do(req)
			if err != nil {
				return "", err
			}
			defer r.Body.Close()
			return handleResponse(r)
		}
	}

	return "", fmt.Errorf("app ID %s not found", appID)
}

func makeEndpoint(lo ListOutput, method string) string {
	return fmt.Sprintf("http://127.0.0.1:%s/v%s/invoke/%s/method/%s", fmt.Sprintf("%v", lo.HTTPPort), api.RuntimeAPIVersion, lo.AppID, method) //nolint: perfsprint
}

func handleResponse(response *http.Response) (string, error) {
	if response.StatusCode < 200 || response.StatusCode >= 400 {
		return "", fmt.Errorf("%s", response.Status)
	}

	rb, err := io.ReadAll(response.Body)
	if err != nil {
		return "", err
	}

	if len(rb) > 0 {
		return string(rb), nil
	}

	return "", nil
}