/*
   Copyright 2014 CoreOS, Inc.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package openstack

import (
	"encoding/json"
	"net"
	"strconv"

	"github.com/vtolstov/cloudinit/datasource"
	"github.com/vtolstov/cloudinit/datasource/metadata"
)

const (
	DefaultAddress = "http://169.254.169.254/"
	apiVersion     = "openstack/latest"
	userdataUrl    = apiVersion + "/user_data"
	metadataPath   = apiVersion + "/meta_data.json"
)

type Address struct {
	IPAddress string `json:"ip_address"`
	Netmask   string `json:"netmask"`
	Cidr      int    `json:"cidr"`
	Gateway   string `json:"gateway"`
}

type Interface struct {
	IPv4 *Address `json:"ipv4"`
	IPv6 *Address `json:"ipv6"`
	MAC  string   `json:"mac"`
	Type string   `json:"type"`
}

type Interfaces struct {
	Public  []Interface `json:"public"`
	Private []Interface `json:"private"`
}

type DNS struct {
	Nameservers []string `json:"nameservers"`
}

type Metadata struct {
	Hostname   string            `json:"hostname"`
	Interfaces Interfaces        `json:"interfaces"`
	PublicKeys map[string]string `json:"public_keys"`
	DNS        DNS               `json:"dns"`
}

type metadataService struct {
	metadata.MetadataService
}

func NewDatasource(root string) *metadataService {
	return &metadataService{MetadataService: metadata.NewDatasource(root, apiVersion, userdataUrl, metadataPath)}
}

func (ms *metadataService) FetchMetadata() (metadata datasource.Metadata, err error) {
	var data []byte
	var m Metadata

	if data, err = ms.FetchData(ms.MetadataUrl()); err != nil || len(data) == 0 {
		return
	}

	if err = json.Unmarshal(data, &m); err != nil {
		return
	}

	if len(m.Interfaces.Public) > 0 {
		if m.Interfaces.Public[0].IPv4 != nil {
			metadata.PublicIPv4 = net.ParseIP(m.Interfaces.Public[0].IPv4.IPAddress)
		}
		if m.Interfaces.Public[0].IPv6 != nil {
			metadata.PublicIPv6 = net.ParseIP(m.Interfaces.Public[0].IPv6.IPAddress)
		}
	}
	if len(m.Interfaces.Private) > 0 {
		if m.Interfaces.Private[0].IPv4 != nil {
			metadata.PrivateIPv4 = net.ParseIP(m.Interfaces.Private[0].IPv4.IPAddress)
		}
		if m.Interfaces.Private[0].IPv6 != nil {
			metadata.PrivateIPv6 = net.ParseIP(m.Interfaces.Private[0].IPv6.IPAddress)
		}
	}

	metadata.Hostname = m.Hostname
	metadata.SSHPublicKeys = map[string]string{}
	metadata.SSHPublicKeys[strconv.Itoa(0)] = m.PublicKeys["root"]
	metadata.NetworkConfig = data

	return
}

func (ms metadataService) Type() string {
	return "openstack-metadata-service"
}