package main

import (
	"context"
	"fmt"
	"os"

	"esxlib/api/cloud"
	"esxlib/pkg/pprint"

	"github.com/urfave/cli/v2"
)

var (
	vmIdFlag = cli.StringFlag{
		Name:  "vm.id",
		Value: "",
		Usage: "The id of the vm to fetch",
	}

	vmNameFlag = cli.StringFlag{
		Name:     "vm.name",
		Value:    "",
		Required: true,
		Usage:    "The id of the vm to fetch",
	}

	slugIdFlag = cli.StringFlag{
		Name:     "slug.id",
		Value:    "",
		Required: true,
		Usage:    "The id of the slug to use",
	}

	sshKeyFileFlag = cli.StringFlag{
		Name:  "ssh.hosts",
		Value: "",
		Usage: "SSH authorized host file to load keys from",
	}

	cloudInitFileFlag = cli.StringFlag{
		Name:  "cloudinit.file",
		Value: "",
		Usage: "CloudInit file to load",
	}
)

var vmCommands = []*cli.Command{
	{
		Name:        "list",
		Aliases:     []string{"ls", "list"},
		Usage:       "list virtual machines",
		Description: "list virtual machines",
		Flags:       []cli.Flag{},
		Action:      vmCommandList,
	},
	{
		Name:        "get",
		Aliases:     []string{"get"},
		Usage:       "get details of a virtual machine",
		Description: "get details of a virtual machines",
		Flags: []cli.Flag{
			&vmIdFlag,
		},
		Action: vmCommandGet,
	},

	{
		Name:        "power-on",
		Aliases:     []string{"poweron", "on", "resume"},
		Usage:       "Power on/resume a Virtual machine",
		Description: "Power on/resume a Virtual machine",
		Flags: []cli.Flag{
			&vmIdFlag,
		},
		Action: vmCommandPowerOn,
	},
	{
		Name:        "power-off",
		Aliases:     []string{"poweroff", "off"},
		Usage:       "Power off a Virtual machine",
		Description: "Power off a Virtual machine",
		Flags: []cli.Flag{
			&vmIdFlag,
		},
		Action: vmCommandPowerOff,
	},
	{
		Name:        "suspend",
		Aliases:     []string{"suspend"},
		Usage:       "Suspend a Virtual machine",
		Description: "Suspend  a Virtual machine",
		Flags: []cli.Flag{
			&vmIdFlag,
		},
		Action: vmCommandPowerSuspend,
	},
	{
		Name:        "destroy",
		Aliases:     []string{"destroy"},
		Usage:       "Destroy an existing virtual machine",
		Description: "Destroy an existing virtual machine",
		Flags: []cli.Flag{
			&vmIdFlag,
		},
		Action: vmCommandDestroy,
	},

	{
		Name:        "create",
		Aliases:     []string{"create"},
		Usage:       "Create a new virtual machine",
		Description: "Create a new virtual machine",
		Flags: []cli.Flag{
			&vmNameFlag,
			&zoneIdFlag,
			&slugIdFlag,
			&sshKeyFileFlag,
			&cloudInitFileFlag,
		},
		Action: vmCommandCreate,
	},
}

func vmCommandList(ctx *cli.Context) error {
	client := mustGetClient(ctx)

	resp, err := client.VMList(context.Background(), &cloud.VMListRequest{})
	if err != nil {
		return err
	}

	out := pprint.NewPrinter("human", os.Stdout)

	out.Headers("VMID", "Name", "State", "Address")
	for _, vm := range resp.Vms {
		address := ""
		// just grab the last one (we can do better later
		for _, a := range vm.Network {
			address = a.Address
		}
		out.Fields(vm.Id, vm.Name, vm.State, address)
	}
	out.Flush()
	return nil
}

func vmCommandGet(ctx *cli.Context) error {
	client := mustGetClient(ctx)

	resp, err := client.VMGet(context.Background(), &cloud.VMGetRequest{
		Search: &cloud.VMGetRequest_Id{
			Id: ctx.String(vmIdFlag.Name),
		},
	})
	if err != nil {
		return err
	}

	out := pprint.NewPrinter("human", os.Stdout)
	vm := resp.Vm
	out.Headers("VMID", "Name", "State", "Address")
	address := ""
	// just grab the last one (we can do better later
	for _, a := range vm.Network {
		address = a.Address
	}
	out.Fields(vm.Id, vm.Name, vm.State, address)
	out.Flush()
	return nil
}

func vmCommandPower(ctx *cli.Context, newState cloud.PowerState) error {
	client := mustGetClient(ctx)

	_, err := client.VMPower(context.Background(), &cloud.VMPowerRequest{
		Id:    ctx.String(vmIdFlag.Name),
		State: newState,
	})
	if err != nil {
		return err
	}
	return nil
}

func vmCommandPowerOn(ctx *cli.Context) error {
	return vmCommandPower(ctx, cloud.PowerState_ON)
}

func vmCommandPowerOff(ctx *cli.Context) error {
	return vmCommandPower(ctx, cloud.PowerState_OFF)
}

func vmCommandPowerSuspend(ctx *cli.Context) error {
	return vmCommandPower(ctx, cloud.PowerState_SUSPENDED)
}

func vmCommandCreate(ctx *cli.Context) error {
	client := mustGetClient(ctx)

	sshAuthorizedHosts := ""
	if ctx.String(sshKeyFileFlag.Name) != "" {
		data, err := os.ReadFile(ctx.String(sshKeyFileFlag.Name))
		if err != nil {
			return fmt.Errorf("Could not read hosts file: %s\n", ctx.String(sshKeyFileFlag.Name))
		}
		sshAuthorizedHosts = string(data)
	}

	cloudInit := ""
	if ctx.String(cloudInitFileFlag.Name) != "" {
		data, err := os.ReadFile(ctx.String(cloudInitFileFlag.Name))
		if err != nil {
			return fmt.Errorf("Could not read cloud init file: %s\n", ctx.String(cloudInitFileFlag.Name))
		}
		cloudInit = string(data)
	}

	req := cloud.VMCreateRequest{
		Name:            ctx.String(vmNameFlag.Name),
		ZoneId:          ctx.String(zoneIdFlag.Name),
		Slug:            ctx.String(slugIdFlag.Name),
		InitScript:      cloudInit,
		AuthorizedHosts: []string{sshAuthorizedHosts},
	}

	resp, err := client.VMCreate(context.Background(), &req)
	if err != nil {
		return err
	}

	out := pprint.NewPrinter("human", os.Stdout)
	vm := resp.Vm
	out.Headers("VMID", "Name", "State", "Address")
	address := ""
	// just grab the last one (we can do better later
	for _, a := range vm.Network {
		address = a.Address
	}
	out.Fields(vm.Id, vm.Name, vm.State, address)
	out.Flush()
	return nil
}

func vmCommandDestroy(ctx *cli.Context) error {
	client := mustGetClient(ctx)
	_, err := client.VMDestroy(context.Background(), &cloud.VMDestroyRequest{
		Id: ctx.String(vmIdFlag.Name),
	})
	if err != nil {
		return err
	}

	return nil
}