package conf

import (
	"errors"
	"os"
	"github.com/dballard/warren/lib/warren"

)

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

// given a valid deployment, add it
// internal, thread unsafe
func addDeployment(msg *Msg) error {
	if err := validateDeployment(msg); err != nil {
		return err
	}
	var dep Deployment
	dep.Path = msg.Args["path"]
	conf.Deployments[msg.Args["name"]] = dep
	dirToNick[msg.Args["path"]] = msg.Args["name"]
	saveConf()
	return nil
}

func rmDeployment(d *Msg) error {
    // Assume nick, check if registered
	deps := GetConf().Deployments
	if dep,ok := deps[d.Args["arg"]]; ok {
		// registered nick
		delete(deps, d.Args["arg"])
		delete(dirToNick, dep.Path)
		saveConf()
		return nil
	} else {
	    // Not a nick, try as path
		absPath := warren.AbsPath(d.Args["path"], d.Args["arg"])
		if nick,ok := dirToNick[absPath]; ok {
		    delete(deps, nick)
		    delete(dirToNick, absPath)
		    saveConf()
		    return nil
		} 
	}
	return errors.New("Cannot find deployment '" + d.Args["arg"] + "' to remove")
}

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

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

	// check if dir exists
	if _, err := os.Stat(d.Args["path"]); err != nil {
		return err
	}
	return nil
}