package conf

import (
	"errors"
	"os"
)

type DeploymentMsg struct {
	Name  string
	Path  string
	Reply chan error
}

// reverse look up map
var dirToNick map[string]string = make(map[string]string)

// Validate a deployment is ok to insert
// internal thread unsafe
func validateDeployment(d *DeploymentMsg) error {
	// check if exists
	if _, ok := conf.Deployments[d.Name]; ok {
		return errors.New("Deployment with that name already exists")
	}

	if r, ok := dirToNick[d.Path]; ok {
		return errors.New("Directory with that name already registered under nick '" + r + "'")
	}

	// check if dir exists
	if _, err := os.Stat(d.Path); err != nil {
		return err
	}
	return nil
}

// given a valid deployment, add it
// internal, thread unsafe
func addDeployment(d *DeploymentMsg) error {
	if err := validateDeployment(d); err != nil {
		d.Reply <- err
		return err
	}
	conf.Deployments[d.Name] = d.Path
	dirToNick[d.Path] = d.Name
	saveConf()
	d.Reply <- nil
	return nil
}

// conf API interface to add a deployment, vets it
func AddDeployment(d *DeploymentMsg) error {

	d.Reply = make(chan error)
	// add to conf / save
	addDeploymentChan <- *d
	err := <-d.Reply
	return err

	// TODO: register with runner, like conf would

	return nil
}