package cmd

import (
	"bytes"
	"encoding/json"
	"github.com/SAP/jenkins-library/pkg/log"
	"github.com/SAP/jenkins-library/pkg/piperenv"
	"github.com/spf13/cobra"
	"io/ioutil"
	"os"
	"path/filepath"
)

// WritePipelineEnv Serializes the commonPipelineEnvironment JSON to disk
func WritePipelineEnv() *cobra.Command {
	return &cobra.Command{
		Use:   "writePipelineEnv",
		Short: "Serializes the commonPipelineEnvironment JSON to disk",
		PreRun: func(cmd *cobra.Command, args []string) {
			path, _ := os.Getwd()
			fatalHook := &log.FatalHook{CorrelationID: GeneralConfig.CorrelationID, Path: path}
			log.RegisterHook(fatalHook)
		},

		Run: func(cmd *cobra.Command, args []string) {
			err := runWritePipelineEnv()
			if err != nil {
				log.Entry().Fatalf("error when writing common Pipeline environment: %v", err)
			}
		},
	}
}

func runWritePipelineEnv() error {
	pipelineEnv, ok := os.LookupEnv("PIPER_pipelineEnv")
	inBytes := []byte(pipelineEnv)
	if !ok {
		var err error
		inBytes, err = ioutil.ReadAll(os.Stdin)
		if err != nil {
			return err
		}
	}
	if len(inBytes) == 0 {
		return nil
	}

	commonPipelineEnv := piperenv.CPEMap{}
	decoder := json.NewDecoder(bytes.NewReader(inBytes))
	decoder.UseNumber()
	err := decoder.Decode(&commonPipelineEnv)
	if err != nil {
		return err
	}

	rootPath := filepath.Join(GeneralConfig.EnvRootPath, "commonPipelineEnvironment")
	err = commonPipelineEnv.WriteToDisk(rootPath)
	if err != nil {
		return err
	}

	writtenBytes, err := json.MarshalIndent(commonPipelineEnv, "", "\t")
	if err != nil {
		return err
	}
	_, err = os.Stdout.Write(writtenBytes)
	if err != nil {
		return err
	}
	return nil
}