package client

import (
	"context"
	"errors"
	"fmt"
	"path"
	"regexp"
	"strings"

	"esxlib/pkg/sshutil"

	"github.com/vmware/govmomi/object"
	"github.com/vmware/govmomi/property"
	"github.com/vmware/govmomi/vim25"
	"github.com/vmware/govmomi/vim25/methods"
	"github.com/vmware/govmomi/vim25/mo"
	"github.com/vmware/govmomi/vim25/types"
)

type PowerState string

const (
	PowerStateOff       = PowerState("off")
	PowerStateOn        = PowerState("on")
	PowerStateSuspended = PowerState("suspended")
	PowerStateUndefined = PowerState("")
)

type VirtualMachine struct {
	c       *vim25.Client
	sshAuth *sshutil.Auth
	mo      *mo.VirtualMachine
	ref     types.ManagedObjectReference
}

func (v *VirtualMachine) refresh() error {
	pc := property.DefaultCollector(v.c)
	refs := []types.ManagedObjectReference{v.ref}

	var vms []mo.VirtualMachine
	err := pc.Retrieve(context.Background(), refs, nil, &vms)
	if err != nil {
		return err
	}

	if len(vms) != 1 || vms[0].Name != v.mo.Name {
		return errors.New("internal error (vms don't) match")
	}

	v.mo = &vms[0]
	return nil
}

func (v *VirtualMachine) Update() error {
	return v.refresh()
}

func (v *VirtualMachine) Name() string {
	return v.mo.Name
}

func (v *VirtualMachine) UUID() string {
	return v.mo.Config.Uuid
}

func (v *VirtualMachine) Id() string {
	return v.mo.Summary.Vm.Value
}

func (v *VirtualMachine) InternalPath() (string, string, error) {
	layout, err := v.GetFiles()
	if err != nil {
		panic(err)
	}

	for _, l := range layout.File {
		if strings.HasSuffix(l.Name, ".vmx") {
			re := regexp.MustCompile(`\[(.*?)\] (.*)`)

			matches := re.FindStringSubmatch(l.Name)
			if len(matches) == 3 {
				return matches[1], path.Dir(matches[2]), nil
			}

		}
	}
	return "", "", fmt.Errorf("not found")
}

func (v *VirtualMachine) GetNetworkAddressV4() []string {
	addresses := make([]string, 0)
	for _, x := range v.mo.Config.ExtraConfig {
		kv := x.GetOptionValue()
		switch kv.Key {
		case "guestinfo.local-ipv4":
			addresses = append(addresses, kv.Value.(string))
		}
	}
	return addresses
}

func (v *VirtualMachine) GetFiles() (*types.VirtualMachineFileLayoutEx, error) {
	if err := v.refresh(); err != nil {
		return nil, err
	}
	return v.mo.LayoutEx, nil
}

func (v *VirtualMachine) State() PowerState {
	switch v.mo.Runtime.PowerState {
	case types.VirtualMachinePowerStatePoweredOff:
		return PowerStateOff
	case types.VirtualMachinePowerStatePoweredOn:
		return PowerStateOn
	case types.VirtualMachinePowerStateSuspended:
		return PowerStateSuspended
	default:
		return PowerStateUndefined
	}
}

func (v *VirtualMachine) PowerOn(ctx context.Context) error {
	if v.sshAuth != nil {
		cmd := fmt.Sprintf("vim-cmd vmsvc/power.on %s", v.Id())
		_, err := sshutil.CombinedOutput(sshutil.Auth{
			User:     v.sshAuth.User,
			Password: v.sshAuth.Password,
			Host:     v.sshAuth.Host,
		}, cmd)
		return err
	}

	return fmt.Errorf("unsupported (requires esx ssh privs)")
}

func (v *VirtualMachine) PowerOff(ctx context.Context) error {
	if v.sshAuth != nil {
		cmd := fmt.Sprintf("vim-cmd vmsvc/power.off %s", v.Id())
		_, err := sshutil.CombinedOutput(sshutil.Auth{
			User:     v.sshAuth.User,
			Password: v.sshAuth.Password,
			Host:     v.sshAuth.Host,
		}, cmd)
		return err
	}
	return fmt.Errorf("unsupported (requires esx ssh privs)")
}

func (v *VirtualMachine) Suspend(ctx context.Context) error {
	// Workaround: if you are running the FREE license of ESX, the power management API is not available to you
	// IE: ServerFaultCode: Current license or ESXi version prohibits execution of the requested operation
	// so as an alternative you can provide the SSH auth to the server and we do it the gross way
	if v.sshAuth != nil {
		cmd := fmt.Sprintf("vim-cmd vmsvc/power.suspend %s", v.Id())
		_, err := sshutil.CombinedOutput(sshutil.Auth{
			User:     v.sshAuth.User,
			Password: v.sshAuth.Password,
			Host:     v.sshAuth.Host,
		}, cmd)
		return err
	}

	// standard API method
	req := types.SuspendVM_Task{
		This: v.mo.Reference(),
	}

	res, err := methods.SuspendVM_Task(ctx, v.c, &req)
	if err != nil {
		return err
	}

	task := object.NewTask(v.c, res.Returnval)
	return task.Wait(ctx)
}

func (v *VirtualMachine) Resume(ctx context.Context) error {
	// Workaround: if you are running the FREE license of ESX, the power management API is not available to you
	// IE: ServerFaultCode: Current license or ESXi version prohibits execution of the requested operation
	// so as an alternative you can provide the SSH auth to the server and we do it the gross way
	if v.sshAuth != nil {
		cmd := fmt.Sprintf("vim-cmd vmsvc/power.on %s", v.Id())
		_, err := sshutil.CombinedOutput(sshutil.Auth{
			User:     v.sshAuth.User,
			Password: v.sshAuth.Password,
			Host:     v.sshAuth.Host,
		}, cmd)
		return err
	}

	// standard API method
	req := types.PowerOnVM_Task{
		This: v.mo.Reference(),
	}

	res, err := methods.PowerOnVM_Task(ctx, v.c, &req)
	if err != nil {
		return err
	}

	task := object.NewTask(v.c, res.Returnval)
	return task.Wait(ctx)
}