package command

import (
	"fmt"
	"strings"

	"github.com/hashicorp/nomad/api"
	"github.com/posener/complete"
)

type JobPeriodicForceCommand struct {
	Meta
}

func (c *JobPeriodicForceCommand) Help() string {
	helpText := `
Usage: nomad job periodic force <job id>

  This command is used to force the creation of a new instance of a periodic job.
  This is used to immediately run a periodic job, even if it violates the job's
  prohibit_overlap setting.

  When ACLs are enabled, this command requires a token with the 'submit-job'
  and 'list-jobs' capabilities for the job's namespace.

General Options:

  ` + generalOptionsUsage(usageOptsDefault) + `

Periodic Force Options:

  -detach
    Return immediately instead of entering monitor mode. After the force,
    the evaluation ID will be printed to the screen, which can be used to
    examine the evaluation using the eval-status command.

  -verbose
    Display full information.
`

	return strings.TrimSpace(helpText)
}

func (c *JobPeriodicForceCommand) Synopsis() string {
	return "Force the launch of a periodic job"
}

func (c *JobPeriodicForceCommand) AutocompleteFlags() complete.Flags {
	return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
		complete.Flags{
			"-detach":  complete.PredictNothing,
			"-verbose": complete.PredictNothing,
		})
}

func (c *JobPeriodicForceCommand) AutocompleteArgs() complete.Predictor {
	return complete.PredictFunc(func(a complete.Args) []string {
		client, err := c.Meta.Client()
		if err != nil {
			return nil
		}

		resp, _, err := client.Jobs().PrefixList(a.Last)
		if err != nil {
			return []string{}
		}

		// filter this by periodic jobs
		matches := make([]string, 0, len(resp))
		for _, job := range resp {
			if job.Periodic {
				matches = append(matches, job.ID)
			}
		}
		return matches
	})
}

func (c *JobPeriodicForceCommand) Name() string { return "job periodic force" }

func (c *JobPeriodicForceCommand) Run(args []string) int {
	var detach, verbose bool

	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
	flags.Usage = func() { c.Ui.Output(c.Help()) }
	flags.BoolVar(&detach, "detach", false, "")
	flags.BoolVar(&verbose, "verbose", false, "")

	if err := flags.Parse(args); err != nil {
		return 1
	}

	// Check that we got exactly one argument
	args = flags.Args()
	if l := len(args); l != 1 {
		c.Ui.Error("This command takes one argument: <job id>")
		c.Ui.Error(commandErrorText(c))
		return 1
	}

	// Truncate the id unless full length is requested
	length := shortId
	if verbose {
		length = fullId
	}

	// Get the HTTP client
	client, err := c.Meta.Client()
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
		return 1
	}

	// Check if the job exists
	jobID := args[0]
	jobs, _, err := client.Jobs().PrefixList(jobID)
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Error forcing periodic job: %s", err))
		return 1
	}
	// filter non-periodic jobs
	periodicJobs := make([]*api.JobListStub, 0, len(jobs))
	for _, j := range jobs {
		if j.Periodic {
			periodicJobs = append(periodicJobs, j)
		}
	}
	if len(periodicJobs) == 0 {
		c.Ui.Error(fmt.Sprintf("No periodic job(s) with prefix or id %q found", jobID))
		return 1
	}
	// preriodicJobs is sorted by job ID
	// so if there is a job whose ID is equal to jobID then it must be the first item
	if len(periodicJobs) > 1 && periodicJobs[0].ID != jobID {
		c.Ui.Error(fmt.Sprintf("Prefix matched multiple periodic jobs\n\n%s", createStatusListOutput(periodicJobs, c.allNamespaces())))
		return 1
	}
	jobID = periodicJobs[0].ID
	q := &api.WriteOptions{Namespace: periodicJobs[0].JobSummary.Namespace}

	// force the evaluation
	evalID, _, err := client.Jobs().PeriodicForce(jobID, q)
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Error forcing periodic job %q: %s", jobID, err))
		return 1
	}

	if detach {
		c.Ui.Output("Force periodic successful")
		c.Ui.Output("Evaluation ID: " + evalID)
		return 0
	}

	// Detach was not specified, so start monitoring
	mon := newMonitor(c.Ui, client, length)
	return mon.monitor(evalID)
}