package e2eutil

import (
	"fmt"
	"io"
	"io/ioutil"
	"os/exec"
	"regexp"
	"strings"
)

// Register registers a jobspec from a file but with a unique ID.
// The caller is responsible for recording that ID for later cleanup.
func Register(jobID, jobFilePath string) error {
	cmd := exec.Command("nomad", "job", "run", "-detach", "-")
	stdin, err := cmd.StdinPipe()
	if err != nil {
		return fmt.Errorf("could not open stdin?: %w", err)
	}

	content, err := ioutil.ReadFile(jobFilePath)
	if err != nil {
		return fmt.Errorf("could not open job file: %w", err)
	}

	// hack off the first line to replace with our unique ID
	var re = regexp.MustCompile(`(?m)^job ".*" \{`)
	jobspec := re.ReplaceAllString(string(content),
		fmt.Sprintf("job \"%s\" {", jobID))

	go func() {
		defer stdin.Close()
		io.WriteString(stdin, jobspec)
	}()

	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("could not register job: %w\n%v", err, string(out))
	}
	return nil
}

// PeriodicForce forces a periodic job to dispatch
func PeriodicForce(jobID string) error {
	// nomad job periodic force
	cmd := exec.Command("nomad", "job", "periodic", "force", jobID)

	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("could not register job: %w\n%v", err, string(out))
	}

	return nil
}

// Dispatch dispatches a parameterized job
func Dispatch(jobID string, meta map[string]string, payload string) error {
	// nomad job periodic force
	args := []string{"job", "dispatch"}
	for k, v := range meta {
		args = append(args, "-meta", fmt.Sprintf("%v=%v", k, v))
	}
	args = append(args, jobID)
	if payload != "" {
		args = append(args, "-")
	}

	cmd := exec.Command("nomad", args...)
	cmd.Stdin = strings.NewReader(payload)

	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("could not dispatch job: %w\n%v", err, string(out))
	}

	return nil
}

// JobInspectTemplate runs nomad job inspect and formats the output
// using the specified go template
func JobInspectTemplate(jobID, template string) (string, error) {
	cmd := exec.Command("nomad", "job", "inspect", "-t", template, jobID)
	out, err := cmd.CombinedOutput()
	if err != nil {
		return "", fmt.Errorf("could not inspect job: %w\n%v", err, string(out))
	}
	outStr := string(out)
	outStr = strings.TrimSuffix(outStr, "\n")
	return outStr, nil
}

// Register registers a jobspec from a string, also with a unique ID.
// The caller is responsible for recording that ID for later cleanup.
func RegisterFromJobspec(jobID, jobspec string) error {

	cmd := exec.Command("nomad", "job", "run", "-detach", "-")
	stdin, err := cmd.StdinPipe()
	if err != nil {
		return fmt.Errorf("could not open stdin?: %w", err)
	}

	// hack off the first line to replace with our unique ID
	var re = regexp.MustCompile(`^job "\w+" \{`)
	jobspec = re.ReplaceAllString(jobspec,
		fmt.Sprintf("job \"%s\" {", jobID))

	go func() {
		defer stdin.Close()
		io.WriteString(stdin, jobspec)
	}()

	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("could not register job: %w\n%v", err, string(out))
	}
	return nil
}

func ChildrenJobSummary(jobID string) ([]map[string]string, error) {
	out, err := Command("nomad", "job", "status", jobID)
	if err != nil {
		return nil, fmt.Errorf("nomad job status failed: %w", err)
	}

	section, err := GetSection(out, "Children Job Summary")
	if err != nil {
		section, err = GetSection(out, "Parameterized Job Summary")
		if err != nil {
			return nil, fmt.Errorf("could not find children job summary section: %w", err)
		}
	}

	summary, err := ParseColumns(section)
	if err != nil {
		return nil, fmt.Errorf("could not parse children job summary section: %w", err)
	}

	return summary, nil
}

func PreviouslyLaunched(jobID string) ([]map[string]string, error) {
	out, err := Command("nomad", "job", "status", jobID)
	if err != nil {
		return nil, fmt.Errorf("nomad job status failed: %w", err)
	}

	section, err := GetSection(out, "Previously Launched Jobs")
	if err != nil {
		return nil, fmt.Errorf("could not find previously launched jobs section: %w", err)
	}

	summary, err := ParseColumns(section)
	if err != nil {
		return nil, fmt.Errorf("could not parse previously launched jobs section: %w", err)
	}

	return summary, nil
}

func DispatchedJobs(jobID string) ([]map[string]string, error) {
	out, err := Command("nomad", "job", "status", jobID)
	if err != nil {
		return nil, fmt.Errorf("nomad job status failed: %w", err)
	}

	section, err := GetSection(out, "Dispatched Jobs")
	if err != nil {
		return nil, fmt.Errorf("could not find previously launched jobs section: %w", err)
	}

	summary, err := ParseColumns(section)
	if err != nil {
		return nil, fmt.Errorf("could not parse previously launched jobs section: %w", err)
	}

	return summary, nil
}