package common

import (
	"fmt"
	"github.com/mitchellh/goamz/ec2"
	"github.com/mitchellh/multistep"
	"github.com/mitchellh/packer/common/uuid"
	"github.com/mitchellh/packer/packer"
	"log"
	"time"
)

type StepSecurityGroup struct {
	SecurityGroupIds []string
	SSHPort          int
	VpcId            string

	createdGroupId string
}

func (s *StepSecurityGroup) Run(state multistep.StateBag) multistep.StepAction {
	ec2conn := state.Get("ec2").(*ec2.EC2)
	ui := state.Get("ui").(packer.Ui)

	if len(s.SecurityGroupIds) > 0 {
		log.Printf("Using specified security groups: %v", s.SecurityGroupIds)
		state.Put("securityGroupIds", s.SecurityGroupIds)
		return multistep.ActionContinue
	}

	if s.SSHPort == 0 {
		panic("SSHPort must be set to a non-zero value.")
	}

	// Create the group
	ui.Say("Creating temporary security group for this instance...")
	groupName := fmt.Sprintf("packer %s", uuid.TimeOrderedUUID())
	log.Printf("Temporary group name: %s", groupName)
	group := ec2.SecurityGroup{
		Name:        groupName,
		Description: "Temporary group for Packer",
		VpcId:       s.VpcId,
	}
	groupResp, err := ec2conn.CreateSecurityGroup(group)
	if err != nil {
		ui.Error(err.Error())
		return multistep.ActionHalt
	}

	// Set the group ID so we can delete it later
	s.createdGroupId = groupResp.Id

	// Authorize the SSH access
	perms := []ec2.IPPerm{
		ec2.IPPerm{
			Protocol:  "tcp",
			FromPort:  s.SSHPort,
			ToPort:    s.SSHPort,
			SourceIPs: []string{"0.0.0.0/0"},
		},
	}

	// We loop and retry this a few times because sometimes the security
	// group isn't available immediately because AWS resources are eventaully
	// consistent.
	ui.Say("Authorizing SSH access on the temporary security group...")
	for i := 0; i < 5; i++ {
		_, err = ec2conn.AuthorizeSecurityGroup(groupResp.SecurityGroup, perms)
		if err == nil {
			break
		}

		log.Printf("Error authorizing. Will sleep and retry. %s", err)
		time.Sleep((time.Duration(i) * time.Second) + 1)
	}

	if err != nil {
		err := fmt.Errorf("Error creating temporary security group: %s", err)
		state.Put("error", err)
		ui.Error(err.Error())
		return multistep.ActionHalt
	}

	// Set some state data for use in future steps
	state.Put("securityGroupIds", []string{s.createdGroupId})

	return multistep.ActionContinue
}

func (s *StepSecurityGroup) Cleanup(state multistep.StateBag) {
	if s.createdGroupId == "" {
		return
	}

	ec2conn := state.Get("ec2").(*ec2.EC2)
	ui := state.Get("ui").(packer.Ui)

	ui.Say("Deleting temporary security group...")

	var err error
	for i := 0; i < 5; i++ {
		_, err = ec2conn.DeleteSecurityGroup(ec2.SecurityGroup{Id: s.createdGroupId})
		if err == nil {
			break
		}

		log.Printf("Error deleting security group: %s", err)
		time.Sleep(5 * time.Second)
	}

	if err != nil {
		ui.Error(fmt.Sprintf(
			"Error cleaning up security group. Please delete the group manually: %s", s.createdGroupId))
	}
}