// Copyright 2015 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 network

import (
	"encoding/json"
	"net"

	"github.com/coreos/coreos-cloudinit/datasource/metadata/packet"
)

func ProcessPacketNetconf(config []byte) ([]InterfaceGenerator, error) {
	var netdata packet.NetworkData
	if err := json.Unmarshal(config, &netdata); err != nil {
		return nil, err
	}

	var nameservers []net.IP
	if netdata.DNS != nil {
		nameservers = netdata.DNS
	} else {
		nameservers = append(nameservers, net.ParseIP("8.8.8.8"), net.ParseIP("8.8.4.4"))
	}

	generators, err := parseNetwork(netdata, nameservers)
	if err != nil {
		return nil, err
	}

	return generators, nil
}

func parseNetwork(netdata packet.NetworkData, nameservers []net.IP) ([]InterfaceGenerator, error) {
	var interfaces []InterfaceGenerator
	var addresses []net.IPNet
	var routes []route
	for _, netblock := range netdata.Netblocks {
		addresses = append(addresses, net.IPNet{
			IP:   netblock.Address,
			Mask: net.IPMask(netblock.Netmask),
		})
		if netblock.Public == false {
			routes = append(routes, route{
				destination: net.IPNet{
					IP:   net.IPv4(10, 0, 0, 0),
					Mask: net.IPv4Mask(255, 0, 0, 0),
				},
				gateway: netblock.Gateway,
			})
		} else {
			if netblock.AddressFamily == 4 {
				routes = append(routes, route{
					destination: net.IPNet{
						IP:   net.IPv4zero,
						Mask: net.IPMask(net.IPv4zero),
					},
					gateway: netblock.Gateway,
				})
			} else {
				routes = append(routes, route{
					destination: net.IPNet{
						IP:   net.IPv6zero,
						Mask: net.IPMask(net.IPv6zero),
					},
					gateway: netblock.Gateway,
				})
			}
		}
	}

	bond := bondInterface{
		logicalInterface: logicalInterface{
			name: "bond0",
			config: configMethodStatic{
				addresses:   addresses,
				nameservers: nameservers,
				routes:      routes,
			},
		},
		options: map[string]string{
			"Mode":             "802.3ad",
			"LACPTransmitRate": "fast",
			"MIIMonitorSec":    ".2",
			"UpDelaySec":       ".2",
			"DownDelaySec":     ".2",
		},
	}

	for _, iface := range netdata.Interfaces {
		if iface.Name != "chassis0" && iface.Name != "ipmi0" {
			bond.slaves = append(bond.slaves, iface.Name)
			if iface.Name == "enp1s0f0" {
				bond.hwaddr, _ = net.ParseMAC(iface.Mac)
			}
		}
	}

	for _, iface := range netdata.Interfaces {
		if iface.Name != "chassis0" && iface.Name != "ipmi0" {
			p := physicalInterface{
				logicalInterface: logicalInterface{
					name: iface.Name,
					config: configMethodStatic{
						nameservers: nameservers,
					},
					children: []networkInterface{&bond},
				},
			}

			if iface.Name == "enp1s0f0" {
				p.configDepth = 20
			}

			interfaces = append(interfaces, &p)
		}
	}

	interfaces = append(interfaces, &bond)

	return interfaces, nil
}