// Copyright 2016 Google 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 pixiecore

import (
	"encoding/base64"
	"fmt"
	"net"
	"time"
)

const savedEventsPerMachine = 10

type machineState int

func (m machineState) String() string {
	switch m {
	case machineStateProxyDHCP:
		return "Made boot offer (ProxyDHCP)"
	case machineStatePXE:
		return "Made boot offer (PXE)"
	case machineStateTFTP:
		return "Sent iPXE binary (TFTP)"
	case machineStateProxyDHCPIpxe:
		return "Made iPXE boot offer (ProxyDHCP)"
	case machineStateIpxeScript:
		return "Sent iPXE script (HTTP)"
	case machineStateKernel:
		return "Sent kernel (HTTP)"
	case machineStateInitrd:
		return "Sent initrd(s) (HTTP)"
	case machineStateBooted:
		return "Booted machine"
	default:
		return "Unknown"
	}
}

func (m machineState) Progress() string {
	return fmt.Sprintf("%.0f%%", float32(m)/float32(machineStateBooted)*100)
}

const (
	machineStateUnknown machineState = iota
	machineStateProxyDHCP
	machineStatePXE
	machineStateTFTP
	machineStateProxyDHCPIpxe
	machineStateIpxeScript
	machineStateKernel
	machineStateInitrd
	machineStateBooted

	machineStateIgnored
)

type machineEvent struct {
	Timestamp time.Time
	State     machineState
	Message   string
}

func (s *Server) machineEvent(mac net.HardwareAddr, state machineState, format string, args ...interface{}) {
	evt := machineEvent{
		Timestamp: time.Now(),
		State:     state,
		Message:   fmt.Sprintf(format, args...),
	}
	k := mac.String()

	s.eventsMu.Lock()
	defer s.eventsMu.Unlock()
	s.events[k] = append(s.events[k], evt)
	if len(s.events[k]) > savedEventsPerMachine {
		s.events[k] = s.events[k][len(s.events[k])-savedEventsPerMachine:]
	}
}

func (s *Server) log(subsystem, format string, args ...interface{}) {
	if s.Log == nil {
		return
	}
	s.Log(subsystem, fmt.Sprintf(format, args...))
}

func (s *Server) debug(subsystem, format string, args ...interface{}) {
	if s.Debug == nil {
		return
	}
	s.Debug(subsystem, fmt.Sprintf(format, args...))
}

func (s *Server) debugPacket(subsystem string, layer int, packet []byte) {
	if s.Debug == nil {
		return
	}
	s.Debug(subsystem, fmt.Sprintf("PKT %d %s END", layer, base64.StdEncoding.EncodeToString(packet)))
}