// Copyright 2016 Open Networking Foundation
//
// 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 main

import (
	"fmt"
	maas "github.com/juju/gomaasapi"
	"net/url"
)

// MaasNodeStatus MAAS lifecycle status for nodes
type MaasNodeStatus int

// MAAS Node Statuses
const (
	Invalid                  MaasNodeStatus = -1
	New                      MaasNodeStatus = 0
	Commissioning            MaasNodeStatus = 1
	FailedCommissioning      MaasNodeStatus = 2
	Missing                  MaasNodeStatus = 3
	Ready                    MaasNodeStatus = 4
	Reserved                 MaasNodeStatus = 5
	Deployed                 MaasNodeStatus = 6
	Retired                  MaasNodeStatus = 7
	Broken                   MaasNodeStatus = 8
	Deploying                MaasNodeStatus = 9
	Allocated                MaasNodeStatus = 10
	FailedDeployment         MaasNodeStatus = 11
	Releasing                MaasNodeStatus = 12
	FailedReleasing          MaasNodeStatus = 13
	DiskErasing              MaasNodeStatus = 14
	FailedDiskErasing        MaasNodeStatus = 15
	RescueMode               MaasNodeStatus = 16
	EnteringRescueMode       MaasNodeStatus = 17
	FailedEnteringRescueMode MaasNodeStatus = 18
	ExitingRescueMode        MaasNodeStatus = 19
	FailedExitingRescueMode  MaasNodeStatus = 20
	Testing                  MaasNodeStatus = 21
	FailedTesting            MaasNodeStatus = 22
)

var names = []string{"New", "Commissioning", "FailedCommissioning", "Missing", "Ready", "Reserved",
	"Deployed", "Retired", "Broken", "Deploying", "Allocated", "FailedDeployment",
	"Releasing", "FailedReleasing", "DiskErasing", "FailedDiskErasing","RescueMode",
	"EnteringRescueMode", "FailedEnteringRescueMode", "ExitingRescueMode", "FailedExitingRescueMode",
	"Testing", "FailedTesting"}

func (v MaasNodeStatus) String() string {
	return names[v]
}

// FromString lookup the constant value for a given node state name
func FromString(name string) (MaasNodeStatus, error) {
	for i, v := range names {
		if v == name {
			return MaasNodeStatus(i), nil
		}
	}
	return -1, fmt.Errorf("Unknown MAAS node state name, '%s'", name)
}

// MaasNode convenience wrapper for an MAAS node on top of a generic MAAS object
type MaasNode struct {
	maas.MAASObject
}

// GetString get attribute value as string
func (n *MaasNode) GetString(key string) (string, error) {
	return n.GetMap()[key].GetString()
}

// GetFloat64 get attribute value as float64
func (n *MaasNode) GetFloat64(key string) (float64, error) {
	return n.GetMap()[key].GetFloat64()
}

// ID get the system id of the node
func (n *MaasNode) ID() string {
	id, _ := n.GetString("system_id")
	return id
}

func (n *MaasNode) PowerType() string {
	ptype, _ := n.GetString("power_type")
	return ptype
}

func (n *MaasNode) PowerState() string {
	state, _ := n.GetString("power_state")
	return state
}

func (n *MaasNode) UpdatePowerParameters(ptype string, params map[string]string) {
	values := url.Values{}
	values.Add("power_type", ptype)
	for k, v := range params {
		values.Add("power_parameters_"+k, v)
	}
	_, err := n.Update(values)
	if err != nil {
		log.Errorf("error updating power settings : %s", err.Error())
	}
}

// Hostname get the hostname
func (n *MaasNode) Hostname() string {
	hn, _ := n.GetString("hostname")
	return hn
}

// IPs get the IP Addresses
func (n *MaasNode) IPs() []string {
	ifaceObj, _ := n.GetMap()["interface_set"]
	ifaces, _ := ifaceObj.GetArray()
	result := []string{}

	for _, iface := range ifaces {
		obj, _ := iface.GetMap()
		linksObj, _ := obj["links"]
		links, _ := linksObj.GetArray()
		for _, link := range links {
			linkObj, _ := link.GetMap()
			ipObj, _ := linkObj["ip_address"]
			ip, _ := ipObj.GetString()
			if ip != "" {
				result = append(result, ip)
			}
		}
	}

	return result
}

// MACs get the MAC Addresses
func (n *MaasNode) MACs() []string {
	ifaceObj, _ := n.GetMap()["interface_set"]
	ifaces, _ := ifaceObj.GetArray()
	if len(ifaces) == 0 {
		return []string{}
	}
	result := make([]string, len(ifaces))
	for i, iface := range ifaces {
		obj, _ := iface.GetMap()
		macAddressObj, _ := obj["mac_address"]
		macAddress,_ := macAddressObj.GetString()
		result[i] = macAddress
	}
	return result
}

// Zone get the zone
func (n *MaasNode) Zone() string {
	zone := n.GetMap()["zone"]
	attrs, _ := zone.GetMap()
	v, _ := attrs["name"].GetString()
	return v
}

// GetInteger get attribute value as integer
func (n *MaasNode) GetInteger(key string) (int, error) {
	v, err := n.GetMap()[key].GetFloat64()
	if err != nil {
		return 0, err
	}
	return int(v), nil
}