package worker

import (
	"fmt"
	"os"
)

type dockerHook struct {
	emptyHook
	provider mirrorProvider
	image    string
	volumes  []string
	options  []string
}

func newDockerHook(p mirrorProvider, gCfg dockerConfig, mCfg mirrorConfig) *dockerHook {
	volumes := []string{}
	volumes = append(volumes, gCfg.Volumes...)
	volumes = append(volumes, mCfg.DockerVolumes...)

	options := []string{}
	options = append(options, gCfg.Options...)
	options = append(options, mCfg.DockerOptions...)

	return &dockerHook{
		provider: p,
		image:    mCfg.DockerImage,
		volumes:  volumes,
		options:  options,
	}
}

func (d *dockerHook) preExec() error {
	p := d.provider
	logFile := p.LogFile()
	workingDir := p.WorkingDir()

	if _, err := os.Stat(workingDir); os.IsNotExist(err) {
		logger.Debugf("Making dir %s", workingDir)
		if err = os.MkdirAll(workingDir, 0755); err != nil {
			return fmt.Errorf("Error making dir %s: %s", workingDir, err.Error())
		}
	}

	logFileNew := "/log_latest"
	workingDirNew := "/data"

	// Override workingDir
	ctx := p.EnterContext()
	ctx.Set(_WorkingDirKey, workingDirNew)
	ctx.Set(_LogFileKey+":docker", logFileNew)
	ctx.Set(
		"volumes", []string{
			fmt.Sprintf("%s:%s", logFile, logFileNew),
			fmt.Sprintf("%s:%s", workingDir, workingDirNew),
		},
	)
	return nil
}

func (d *dockerHook) postExec() error {
	// sh.Command(
	// 	"docker", "rm", "-f", d.Name(),
	// ).Run()
	d.provider.ExitContext()
	return nil
}

// Volumes returns the configured volumes and
// runtime-needed volumes, including mirror dirs
// and log files
func (d *dockerHook) Volumes() []string {
	vols := make([]string, len(d.volumes))
	copy(vols, d.volumes)

	p := d.provider
	ctx := p.Context()
	if ivs, ok := ctx.Get("volumes"); ok {
		vs := ivs.([]string)
		vols = append(vols, vs...)
	}
	return vols
}

func (d *dockerHook) LogFile() string {
	p := d.provider
	ctx := p.Context()
	if iv, ok := ctx.Get(_LogFileKey + ":docker"); ok {
		v := iv.(string)
		return v
	}
	return p.LogFile()
}

func (d *dockerHook) Name() string {
	p := d.provider
	return "tunasync-job-" + p.Name()
}