/**
 * 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 main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"os"

	"time"

	"strings"

	"log"

	"github.com/paypal/gorealis"
	"github.com/paypal/gorealis/gen-go/apache/aurora"
	"github.com/paypal/gorealis/response"
)

var cmd, executor, url, clustersConfig, clusterName, updateId, username, password, zkUrl, hostList string

var CONNECTION_TIMEOUT = 20000

func init() {
	flag.StringVar(&cmd, "cmd", "", "Job request type to send to Aurora Scheduler")
	flag.StringVar(&executor, "executor", "thermos", "Executor to use")
	flag.StringVar(&url, "url", "", "URL at which the Aurora Scheduler exists as [url]:[port]")
	flag.StringVar(&clustersConfig, "clusters", "", "Location of the clusters.json file used by aurora.")
	flag.StringVar(&clusterName, "cluster", "devcluster", "Name of cluster to run job on (only necessary if clusters is set)")
	flag.StringVar(&updateId, "updateId", "", "Update ID to operate on")
	flag.StringVar(&username, "username", "aurora", "Username to use for authorization")
	flag.StringVar(&password, "password", "secret", "Password to use for authorization")
	flag.StringVar(&zkUrl, "zkurl", "", "zookeeper url")
	flag.StringVar(&hostList, "hostList", "", "Comma separated list of hosts to operate on")
	flag.Parse()

	// Attempt to load leader from zookeeper using a
	// cluster.json file used for the default aurora client if provided.
	// This will override the provided url in the arguments
	if clustersConfig != "" {
		clusters, err := realis.LoadClusters(clustersConfig)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		cluster, ok := clusters[clusterName]
		if !ok {
			fmt.Printf("Cluster %s doesn't exist in the file provided\n", clusterName)
			os.Exit(1)
		}

		url, err = realis.LeaderFromZK(cluster)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
	}
}

func main() {

	var job realis.Job
	var err error
	var monitor *realis.Monitor
	var r realis.Realis

	clientOptions := []realis.ClientOption{
		realis.BasicAuth(username, password),
		realis.ThriftJSON(),
		realis.TimeoutMS(CONNECTION_TIMEOUT),
		realis.BackOff(&realis.Backoff{
			Steps:    2,
			Duration: 10 * time.Second,
			Factor:   2.0,
			Jitter:   0.1,
		}),
		realis.SetLogger(log.New(os.Stdout, "realis-debug: ", log.Ldate)),
	}

	//check if zkUrl is available.
	if zkUrl != "" {
		fmt.Println("zkUrl: ", zkUrl)
		clientOptions = append(clientOptions, realis.ZKUrl(zkUrl))
	} else {
		clientOptions = append(clientOptions, realis.SchedulerUrl(url))
	}

	r, err = realis.NewRealisClient(clientOptions...)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	monitor = &realis.Monitor{r}
	defer r.Close()

	switch executor {
	case "thermos":
		payload, err := ioutil.ReadFile("examples/thermos_payload.json")
		if err != nil {
			fmt.Println("Error reading json config file: ", err)
			os.Exit(1)
		}

		job = realis.NewJob().
			Environment("prod").
			Role("vagrant").
			Name("hello_world_from_gorealis").
			ExecutorName(aurora.AURORA_EXECUTOR_NAME).
			ExecutorData(string(payload)).
			CPU(1).
			RAM(64).
			Disk(100).
			IsService(true).
			InstanceCount(1).
			AddPorts(1)
		break
	case "compose":
		job = realis.NewJob().
			Environment("prod").
			Role("vagrant").
			Name("docker-compose").
			ExecutorName("docker-compose-executor").
			ExecutorData("{}").
			CPU(0.25).
			RAM(64).
			Disk(100).
			IsService(true).
			InstanceCount(1).
			AddPorts(4).
			AddLabel("fileName", "sample-app/docker-compose.yml").
			AddURIs(true, true, "https://github.com/mesos/docker-compose-executor/releases/download/0.1.0/sample-app.tar.gz")
		break
	case "none":
		job = realis.NewJob().
			Environment("prod").
			Role("vagrant").
			Name("docker_as_task").
			CPU(1).
			RAM(64).
			Disk(100).
			IsService(true).
			InstanceCount(1).
			AddPorts(1)
		break
	default:
		fmt.Println("Only thermos, compose, and none are supported for now")
		os.Exit(1)
	}

	switch cmd {
	case "create":
		fmt.Println("Creating job")
		resp, err := r.CreateJob(job)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), job.GetInstanceCount(), 5, 50); !ok || err != nil {
				_, err := r.KillJob(job.JobKey())
				if err != nil {
					fmt.Println(err)
					os.Exit(1)
				}
				fmt.Println("ok: ", ok)
				fmt.Println("err: ", err)
			}

		}
		break
	case "createService":
		// Create a service with three instances using the update API instead of the createJob API
		fmt.Println("Creating service")
		settings := realis.NewUpdateSettings()
		job.InstanceCount(3)
		_, resp, err := r.CreateService(job, *settings)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		if ok, err := monitor.JobUpdate(*resp.GetKey(), 5, 50); !ok || err != nil {
			_, err := r.KillJob(job.JobKey())
			if err != nil {
				fmt.Println(err)
				os.Exit(1)
			}
			fmt.Println("ok: ", ok)
			fmt.Println("err: ", err)
		}

		break
	case "createDocker":
		fmt.Println("Creating a docker based job")
		container := realis.NewDockerContainer().Image("python:2.7").AddParameter("network", "host")
		job.Container(container)
		resp, err := r.CreateJob(job)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), job.GetInstanceCount(), 10, 300); !ok || err != nil {
				_, err := r.KillJob(job.JobKey())
				if err != nil {
					fmt.Println(err)
					os.Exit(1)
				}
			}
		}
		break
	case "createMesosContainer":
		fmt.Println("Creating a docker based job")
		container := realis.NewMesosContainer().DockerImage("python", "2.7")
		job.Container(container)
		resp, err := r.CreateJob(job)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), job.GetInstanceCount(), 10, 300); !ok || err != nil {
				_, err := r.KillJob(job.JobKey())
				if err != nil {
					fmt.Println(err)
					os.Exit(1)
				}
			}
		}
		break
	case "scheduleCron":
		fmt.Println("Scheduling a Cron job")
		// Cron config
		job.CronSchedule("* * * * *")
		job.IsService(false)
		resp, err := r.ScheduleCronJob(job)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		break
	case "startCron":
		fmt.Println("Starting a Cron job")
		resp, err := r.StartCronJob(job.JobKey())
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		break
	case "descheduleCron":
		fmt.Println("Descheduling a Cron job")
		resp, err := r.DescheduleCronJob(job.JobKey())
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())

		break
	case "kill":
		fmt.Println("Killing job")

		resp, err := r.KillJob(job.JobKey())
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), 0, 5, 50); !ok || err != nil {
				fmt.Println("Unable to kill all instances of job")
				os.Exit(1)
			}
		}
		fmt.Println(resp.String())
		break
	case "restart":
		fmt.Println("Restarting job")
		resp, err := r.RestartJob(job.JobKey())
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		fmt.Println(resp.String())
		break
	case "liveCount":
		fmt.Println("Getting instance count")

		live, err := r.GetInstanceIds(job.JobKey(), aurora.LIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		fmt.Printf("Live instances: %+v\n", live)
		break
	case "activeCount":
		fmt.Println("Getting instance count")

		live, err := r.GetInstanceIds(job.JobKey(), aurora.ACTIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		fmt.Println("Number of live instances: ", len(live))
		break
	case "flexUp":
		fmt.Println("Flexing up job")

		numOfInstances := int32(4)

		live, err := r.GetInstanceIds(job.JobKey(), aurora.ACTIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		currInstances := int32(len(live))
		fmt.Println("Current num of instances: ", currInstances)
		var instId int32
		for k := range live {
			instId = k
			break
		}
		resp, err := r.AddInstances(aurora.InstanceKey{
			JobKey:     job.JobKey(),
			InstanceId: instId,
		},
			numOfInstances)

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), currInstances+numOfInstances, 5, 50); !ok || err != nil {
				fmt.Println("Flexing up failed")
			}
		}
		fmt.Println(resp.String())
		break
	case "flexDown":
		fmt.Println("Flexing down job")

		numOfInstances := int32(2)

		live, err := r.GetInstanceIds(job.JobKey(), aurora.ACTIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		currInstances := int32(len(live))
		fmt.Println("Current num of instances: ", currInstances)

		resp, err := r.RemoveInstances(job.JobKey(), numOfInstances)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		if resp.ResponseCode == aurora.ResponseCode_OK {
			if ok, err := monitor.Instances(job.JobKey(), currInstances-numOfInstances, 5, 50); !ok || err != nil {
				fmt.Println("flexDown failed")
			}
		}
		fmt.Println(resp.String())
		break
	case "update":
		fmt.Println("Updating a job with with more RAM and to 5 instances")
		live, err := r.GetInstanceIds(job.JobKey(), aurora.ACTIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		var instId int32
		for k := range live {
			instId = k
			break
		}
		taskConfig, err := r.FetchTaskConfig(aurora.InstanceKey{
			JobKey:     job.JobKey(),
			InstanceId: instId,
		})
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		updateJob := realis.NewDefaultUpdateJob(taskConfig)
		updateJob.InstanceCount(5).RAM(128)

		resp, err := r.StartJobUpdate(updateJob, "")
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		jobUpdateKey := response.JobUpdateKey(resp)
		monitor.JobUpdate(*jobUpdateKey, 5, 500)
		break
	case "updateDetails":
		resp, err := r.JobUpdateDetails(aurora.JobUpdateQuery{
			Key: &aurora.JobUpdateKey{
				Job: job.JobKey(),
				ID:  updateId,
			},
			Limit: 1,
		})

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(response.JobUpdateDetails(resp))
		break
	case "abortUpdate":
		fmt.Println("Abort update")
		resp, err := r.AbortJobUpdate(aurora.JobUpdateKey{
			Job: job.JobKey(),
			ID:  updateId,
		},
			"")

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())
		break
	case "rollbackUpdate":
		fmt.Println("Abort update")
		resp, err := r.RollbackJobUpdate(aurora.JobUpdateKey{
			Job: job.JobKey(),
			ID:  updateId,
		},
			"")

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		fmt.Println(resp.String())
		break
	case "taskConfig":
		fmt.Println("Getting job info")
		live, err := r.GetInstanceIds(job.JobKey(), aurora.ACTIVE_STATES)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		var instId int32
		for k := range live {
			instId = k
			break
		}
		config, err := r.FetchTaskConfig(aurora.InstanceKey{
			JobKey:     job.JobKey(),
			InstanceId: instId,
		})

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		print(config.String())
		break
	case "updatesummary":
		fmt.Println("Getting job update summary")
		jobquery := &aurora.JobUpdateQuery{
			Role:   &job.JobKey().Role,
			JobKey: job.JobKey(),
		}
		updatesummary, err := r.GetJobUpdateSummaries(jobquery)
		if err != nil {
			fmt.Printf("error while getting update summary: %v", err)
			os.Exit(1)
		}
		fmt.Println(updatesummary)
	case "taskStatus":
		fmt.Println("Getting task status")
		taskQ := &aurora.TaskQuery{
			Role:        job.JobKey().Role,
			Environment: job.JobKey().Environment,
			JobName:     job.JobKey().Name,
		}
		tasks, err := r.GetTaskStatus(taskQ)
		if err != nil {
			fmt.Printf("error: %+v\n ", err)
			os.Exit(1)
		}
		fmt.Printf("length: %d\n ", len(tasks))
		fmt.Printf("tasks: %+v\n", tasks)
	case "tasksWithoutConfig":
		fmt.Println("Getting task status")
		taskQ := &aurora.TaskQuery{
			Role:        job.JobKey().Role,
			Environment: job.JobKey().Environment,
			JobName:     job.JobKey().Name,
		}
		tasks, err := r.GetTasksWithoutConfigs(taskQ)
		if err != nil {
			fmt.Printf("error: %+v\n ", err)
			os.Exit(1)
		}
		fmt.Printf("length: %d\n ", len(tasks))
		fmt.Printf("tasks: %+v\n", tasks)
	case "drainHosts":
		fmt.Println("Setting hosts to DRAINING")
		if hostList == "" {
			fmt.Println("No hosts specified to drain")
			os.Exit(1)
		}
		hosts := strings.Split(hostList, ",")
		_, result, err := r.DrainHosts(hosts...)
		if err != nil {
			fmt.Printf("error: %+v\n", err.Error())
			os.Exit(1)
		}

		// Monitor change to DRAINING and DRAINED mode
		hostResult, err := monitor.HostMaintenance(
			hosts,
			[]aurora.MaintenanceMode{aurora.MaintenanceMode_DRAINED, aurora.MaintenanceMode_DRAINING},
			5,
			10)
		if err != nil {
			for host, ok := range hostResult {
				if !ok {
					fmt.Printf("Host %s did not transtion into desired mode(s)\n", host)
				}
			}

			fmt.Printf("error: %+v\n", err.Error())
			os.Exit(1)
		}

		fmt.Print(result.String())
	case "endMaintenance":
		fmt.Println("Setting hosts to ACTIVE")
		if hostList == "" {
			fmt.Println("No hosts specified to drain")
			os.Exit(1)
		}
		hosts := strings.Split(hostList, ",")
		_, result, err := r.EndMaintenance(hosts...)
		if err != nil {
			fmt.Printf("error: %+v\n", err.Error())
			os.Exit(1)
		}

		// Monitor change to DRAINING and DRAINED mode
		hostResult, err := monitor.HostMaintenance(
			hosts,
			[]aurora.MaintenanceMode{aurora.MaintenanceMode_NONE},
			5,
			10)
		if err != nil {
			for host, ok := range hostResult {
				if !ok {
					fmt.Printf("Host %s did not transtion into desired mode(s)\n", host)
				}
			}

			fmt.Printf("error: %+v\n", err.Error())
			os.Exit(1)
		}

		fmt.Print(result.String())
	default:
		fmt.Println("Command not supported")
		os.Exit(1)
	}
}