package client

import (
	"bytes"
	"fmt"
	"net/http"
	"os/exec"
	"strings"

	"github.com/bndr/gojenkins"
	"github.com/pkg/errors"
)

var errorNotFound = errors.New("404")

// Jenkins defines Jenkins API
type Jenkins interface {
	GenerateToken(userName, tokenName string) (*UserToken, error)
	Info() (*gojenkins.ExecutorResponse, error)
	SafeRestart() error
	CreateNode(name string, numExecutors int, description string, remoteFS string, label string, options ...interface{}) (*gojenkins.Node, error)
	DeleteNode(name string) (bool, error)
	CreateFolder(name string, parents ...string) (*gojenkins.Folder, error)
	CreateJobInFolder(config string, jobName string, parentIDs ...string) (*gojenkins.Job, error)
	CreateJob(config string, options ...interface{}) (*gojenkins.Job, error)
	CreateOrUpdateJob(config, jobName string) (*gojenkins.Job, bool, error)
	RenameJob(job string, name string) *gojenkins.Job
	CopyJob(copyFrom string, newName string) (*gojenkins.Job, error)
	DeleteJob(name string) (bool, error)
	BuildJob(name string, options ...interface{}) (int64, error)
	GetNode(name string) (*gojenkins.Node, error)
	GetLabel(name string) (*gojenkins.Label, error)
	GetBuild(jobName string, number int64) (*gojenkins.Build, error)
	GetJob(id string, parentIDs ...string) (*gojenkins.Job, error)
	GetSubJob(parentID string, childID string) (*gojenkins.Job, error)
	GetFolder(id string, parents ...string) (*gojenkins.Folder, error)
	GetAllNodes() ([]*gojenkins.Node, error)
	GetAllBuildIds(job string) ([]gojenkins.JobBuild, error)
	GetAllJobNames() ([]gojenkins.InnerJob, error)
	GetAllJobs() ([]*gojenkins.Job, error)
	GetQueue() (*gojenkins.Queue, error)
	GetQueueUrl() string
	GetQueueItem(id int64) (*gojenkins.Task, error)
	GetArtifactData(id string) (*gojenkins.FingerPrintResponse, error)
	GetPlugins(depth int) (*gojenkins.Plugins, error)
	UninstallPlugin(name string) error
	HasPlugin(name string) (*gojenkins.Plugin, error)
	InstallPlugin(name string, version string) error
	ValidateFingerPrint(id string) (bool, error)
	GetView(name string) (*gojenkins.View, error)
	GetAllViews() ([]*gojenkins.View, error)
	CreateView(name string, viewType string) (*gojenkins.View, error)
	Poll() (int, error)
	ExecuteScript(groovyScript string) (logs string, err error)
}

type jenkins struct {
	gojenkins.Jenkins
}

// CreateOrUpdateJob creates or updates a job from config
func (jenkins *jenkins) CreateOrUpdateJob(config, jobName string) (job *gojenkins.Job, created bool, err error) {
	// create or update
	job, err = jenkins.GetJob(jobName)
	if isNotFoundError(err) {
		job, err = jenkins.CreateJob(config, jobName)
		created = true
		return job, true, errors.WithStack(err)
	} else if err != nil {
		return job, false, errors.WithStack(err)
	}

	err = job.UpdateConfig(config)
	return job, false, errors.WithStack(err)
}

// BuildJenkinsAPIUrl returns Jenkins API URL
func BuildJenkinsAPIUrl(namespace, serviceName string, portNumber int32, local, minikube bool) (string, error) {
	// Get Jenkins URL from minikube command
	if local && minikube {
		cmd := exec.Command("minikube", "service", "--url", "-n", namespace, serviceName)
		var out bytes.Buffer
		cmd.Stdout = &out
		err := cmd.Run()
		if err != nil {
			return "", errors.WithStack(err)
		}
		lines := strings.Split(out.String(), "\n")
		// First is for http, the second one is for Jenkins slaves communication
		// see pkg/controller/jenkins/configuration/base/resources/service.go
		url := lines[0]
		return url, nil
	}

	if local {
		// When run locally make port-forward to jenkins pod ('kubectl -n default port-forward jenkins-operator-example 8080')
		return fmt.Sprintf("http://localhost:%d", portNumber), nil
	}

	// Connect through Kubernetes service, operator has to be run inside cluster
	return fmt.Sprintf("http://%s:%d", serviceName, portNumber), nil
}

// New creates Jenkins API client
func New(url, user, passwordOrToken string) (Jenkins, error) {
	if strings.HasSuffix(url, "/") {
		url = url[:len(url)-1]
	}

	jenkinsClient := &jenkins{}
	jenkinsClient.Server = url
	jenkinsClient.Requester = &gojenkins.Requester{
		Base:      url,
		SslVerify: true,
		Client:    http.DefaultClient,
		BasicAuth: &gojenkins.BasicAuth{Username: user, Password: passwordOrToken},
	}
	if _, err := jenkinsClient.Init(); err != nil {
		return nil, errors.Wrap(err, "couldn't init Jenkins API client")
	}

	status, err := jenkinsClient.Poll()
	if err != nil {
		return nil, errors.Wrap(err, "couldn't poll data from Jenkins API")
	}
	if status != http.StatusOK {
		return nil, errors.Errorf("couldn't poll data from Jenkins API, invalid status code returned: %d", status)
	}

	return jenkinsClient, nil
}

func isNotFoundError(err error) bool {
	if err != nil {
		return err.Error() == errorNotFound.Error()
	}
	return false
}