package database

import (
	"crypto/rsa"

	"git.xeserv.us/xena/route/routerpc"
	"git.xeserv.us/xena/route/utils"
	r "github.com/GoRethink/gorethink"
)

// DB is the high level wrapper to the datastore.
type DB struct {
	s *r.Session
}

// New takes a rethinkdb host and databasea and sets up a connection.
func New(host, database string) (*DB, error) {
	session, err := r.Connect(r.ConnectOpts{
		Address:  host,
		Database: database,
	})
	if err != nil {
		return nil, err
	}

	db := &DB{
		s: session,
	}

	return db, nil
}

var tables = []string{
	"certs",
	"routes",
}

// Route is a single route object serialized to rethinkdb.
type Route struct {
	ID            string `gorethink:"id,omitempty"`
	Hostname      string `gorethink:"hostname"`
	OnionHostname string `gorethink:"onionhostname"`
	Token         string `gorethink:"token"`
	OnionKey      []byte `gorethink:"onionKey"` // PEM-encoded
}

// SaveRoute adds the route to the database.
func (db *DB) SaveRoute(resp *routerpc.AddHostResponse) error {
	bytes := utils.RSAPrivateKeyToPem(resp.PrivKey.(*rsa.PrivateKey))

	rt := &Route{
		Hostname:      resp.Hostname,
		OnionHostname: resp.OnionHostname,
		Token:         resp.Token,
		OnionKey:      bytes,
	}

	// TODO: check if OnionHostname or Hostname actually exists in
	// the database. RethinkDB doesn't support unique secondary indexes.

	_, err := r.Table("routes").Insert(rt).RunWrite(db.s)
	if err != nil {
		return err
	}

	return nil
}

func (db *DB) GetRouteForHost(name string) (*Route, error) {
	rows, err := r.Table("routes").Filter(map[string]interface{}{"hostname": name}).Run(db.s)
	if err != nil {
		return nil, err
	}

	result := &Route{}

	err = rows.One(result)
	if err != nil {
		return nil, err
	}

	return result, nil
}

// GetAllRoutes fetches all of the route entries from the database
// and returns them. This is intended for the startup process or
// admin tooling.
func (db *DB) GetAllRoutes() ([]Route, error) {
	rows, err := r.Table("routes").Run(db.s)
	if err != nil {
		return nil, err
	}

	var routes []Route
	err = rows.All(&routes)
	if err != nil {
		return nil, err
	}

	return routes, nil
}