package cmd

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http/cookiejar"
	"reflect"
	"strings"
	"time"

	"github.com/SAP/jenkins-library/pkg/abaputils"
	"github.com/SAP/jenkins-library/pkg/command"
	piperhttp "github.com/SAP/jenkins-library/pkg/http"
	"github.com/SAP/jenkins-library/pkg/log"
	"github.com/SAP/jenkins-library/pkg/telemetry"
	"github.com/pkg/errors"
)

func abapEnvironmentCloneGitRepo(config abapEnvironmentCloneGitRepoOptions, telemetryData *telemetry.CustomData) {

	c := command.Command{}

	c.Stdout(log.Writer())
	c.Stderr(log.Writer())

	var autils = abaputils.AbapUtils{
		Exec: &c,
	}

	client := piperhttp.Client{}

	// error situations should stop execution through log.Entry().Fatal() call which leads to an os.Exit(1) in the end
	err := runAbapEnvironmentCloneGitRepo(&config, telemetryData, &autils, &client)
	if err != nil {
		log.Entry().WithError(err).Fatal("step execution failed")
	}
}

func runAbapEnvironmentCloneGitRepo(config *abapEnvironmentCloneGitRepoOptions, telemetryData *telemetry.CustomData, com abaputils.Communication, client piperhttp.Sender) error {
	// Mapping for options
	subOptions := convertCloneConfig(config)

	// Determine the host, user and password, either via the input parameters or via a cloud foundry service key
	connectionDetails, errorGetInfo := com.GetAbapCommunicationArrangementInfo(subOptions, "/sap/opu/odata/sap/MANAGE_GIT_REPOSITORY/Clones")
	if errorGetInfo != nil {
		return errors.Wrap(errorGetInfo, "Parameters for the ABAP Connection not available")
	}

	// Configuring the HTTP Client and CookieJar
	cookieJar, errorCookieJar := cookiejar.New(nil)
	if errorCookieJar != nil {
		return errors.Wrap(errorCookieJar, "Could not create a Cookie Jar")
	}

	client.SetOptions(piperhttp.ClientOptions{
		MaxRequestDuration: 180 * time.Second,
		CookieJar:          cookieJar,
		Username:           connectionDetails.User,
		Password:           connectionDetails.Password,
	})

	repositories, errGetRepos := abaputils.GetRepositories(&abaputils.RepositoriesConfig{BranchName: config.BranchName, RepositoryName: config.RepositoryName, Repositories: config.Repositories})
	if errGetRepos != nil {
		return fmt.Errorf("Something failed during the clone: %w", errGetRepos)
	}

	log.Entry().Infof("Start cloning %v repositories", len(repositories))
	for _, repo := range repositories {

		commitString := ""
		if repo.CommitID != "" {
			commitString = ", commit '" + repo.CommitID + "'"
		}

		log.Entry().Info("-------------------------")
		log.Entry().Info("Start cloning " + repo.Name + ", branch " + repo.Branch + commitString)
		log.Entry().Info("-------------------------")

		// Triggering the Clone of the repository into the ABAP Environment system
		uriConnectionDetails, errorTriggerClone := triggerClone(repo, connectionDetails, client)
		if errorTriggerClone != nil {
			return errors.Wrapf(errorTriggerClone, "Clone of '%s', branch '%s'%s failed on the ABAP System", repo.Name, repo.Branch, commitString)
		}

		// Polling the status of the repository import on the ABAP Environment system
		status, errorPollEntity := abaputils.PollEntity(repo.Name, uriConnectionDetails, client, com.GetPollIntervall())
		if errorPollEntity != nil {
			return errors.Wrapf(errorPollEntity, "Clone of '%s', branch '%s'%s failed on the ABAP System", repo.Name, repo.Branch, commitString)
		}
		if status == "E" {
			return errors.New("Clone of '" + repo.Name + "', branch '" + repo.Branch + "'" + commitString + " failed on the ABAP System")
		}

		log.Entry().Info(repo.Name + ", branch  " + repo.Branch + commitString + " was cloned successfully")
	}
	log.Entry().Info("-------------------------")
	log.Entry().Info("All repositories were cloned successfully")
	return nil
}

func triggerClone(repo abaputils.Repository, cloneConnectionDetails abaputils.ConnectionDetailsHTTP, client piperhttp.Sender) (abaputils.ConnectionDetailsHTTP, error) {

	uriConnectionDetails := cloneConnectionDetails
	uriConnectionDetails.URL = ""
	cloneConnectionDetails.XCsrfToken = "fetch"

	// Loging into the ABAP System - getting the x-csrf-token and cookies
	resp, err := abaputils.GetHTTPResponse("HEAD", cloneConnectionDetails, nil, client)
	if err != nil {
		err = abaputils.HandleHTTPError(resp, err, "Authentication on the ABAP system failed", cloneConnectionDetails)
		return uriConnectionDetails, err
	}
	defer resp.Body.Close()

	// workaround until golang version 1.16 is used
	time.Sleep(100 * time.Millisecond)

	log.Entry().WithField("StatusCode", resp.Status).WithField("ABAP Endpoint", cloneConnectionDetails.URL).Debug("Authentication on the ABAP system successful")
	uriConnectionDetails.XCsrfToken = resp.Header.Get("X-Csrf-Token")
	cloneConnectionDetails.XCsrfToken = uriConnectionDetails.XCsrfToken

	// Trigger the Clone of a Repository
	if repo.Name == "" {
		return uriConnectionDetails, errors.New("An empty string was passed for the parameter 'repositoryName'")
	}

	commitQuery, commitString := abaputils.GetCommitStrings(repo.CommitID)

	jsonBody := []byte(`{"sc_name":"` + repo.Name + `", "branch_name":"` + repo.Branch + `"` + commitQuery + `}`)
	resp, err = abaputils.GetHTTPResponse("POST", cloneConnectionDetails, jsonBody, client)
	if err != nil {
		err = abaputils.HandleHTTPError(resp, err, "Could not clone the Repository / Software Component "+repo.Name+", branch "+repo.Branch+commitString, uriConnectionDetails)
		return uriConnectionDetails, err
	}
	defer resp.Body.Close()
	log.Entry().WithField("StatusCode", resp.Status).WithField("repositoryName", repo.Name).WithField("branchName", repo.Branch).WithField("commitID", repo.CommitID).Info("Triggered Clone of Repository / Software Component")

	// Parse Response
	var body abaputils.CloneEntity
	var abapResp map[string]*json.RawMessage
	bodyText, errRead := ioutil.ReadAll(resp.Body)
	if errRead != nil {
		return uriConnectionDetails, err
	}
	json.Unmarshal(bodyText, &abapResp)
	json.Unmarshal(*abapResp["d"], &body)
	if reflect.DeepEqual(abaputils.CloneEntity{}, body) {
		log.Entry().WithField("StatusCode", resp.Status).WithField("repositoryName", repo.Name).WithField("branchName", repo.Branch).WithField("commitID", repo.CommitID).Error("Could not Clone the Repository / Software Component")
		err := errors.New("Request to ABAP System not successful")
		return uriConnectionDetails, err
	}

	expandLog := "?$expand=to_Execution_log,to_Transport_log"

	// The entity "Clones" does not allow for polling. To poll the progress, the related entity "Pull" has to be called
	// While "Clones" has the key fields UUID, SC_NAME and BRANCH_NAME, "Pull" only has the key field UUID
	tempURI := strings.Replace(body.Metadata.URI, "/sap/opu/odata/sap/MANAGE_GIT_REPOSITORY/Clones", "/sap/opu/odata/sap/MANAGE_GIT_REPOSITORY/Pull", 1)
	pollingURI := strings.Replace(tempURI, ",sc_name='"+repo.Name+"',branch_name='"+repo.Branch+"'", "", 1)

	uriConnectionDetails.URL = pollingURI + expandLog
	return uriConnectionDetails, nil
}

func convertCloneConfig(config *abapEnvironmentCloneGitRepoOptions) abaputils.AbapEnvironmentOptions {
	subOptions := abaputils.AbapEnvironmentOptions{}

	subOptions.CfAPIEndpoint = config.CfAPIEndpoint
	subOptions.CfServiceInstance = config.CfServiceInstance
	subOptions.CfServiceKeyName = config.CfServiceKeyName
	subOptions.CfOrg = config.CfOrg
	subOptions.CfSpace = config.CfSpace
	subOptions.Host = config.Host
	subOptions.Password = config.Password
	subOptions.Username = config.Username
	return subOptions
}