package role

import (
	"encoding/base64"
	"errors"
	"os"
	"strings"

	"github.com/kairos-io/kairos-sdk/machine"
	"github.com/kairos-io/kairos-sdk/utils"
	providerConfig "github.com/kairos-io/provider-kairos/v2/internal/provider/config"
	common "github.com/kairos-io/provider-kairos/v2/internal/role"
	service "github.com/mudler/edgevpn/api/client/service"
	"gopkg.in/yaml.v2"
)

const (
	K0sDistroName = "k0s"
)

type K0sControlPlane struct {
	providerConfig *providerConfig.Config
	roleConfig     *service.RoleConfig
	ip             string
	role           string
}

type K0sWorker struct {
	providerConfig *providerConfig.Config
	roleConfig     *service.RoleConfig
	ip             string
	role           string
}

func (k *K0sControlPlane) K8sBin() string {
	return utils.K0sBin()
}

func (k *K0sWorker) K8sBin() string {
	return utils.K0sBin()
}

func (k *K0sControlPlane) DeployKubeVIP() error {
	pconfig := k.ProviderConfig()
	if pconfig.KubeVIP.IsEnabled() {
		return errors.New("KubeVIP is not yet supported with k0s")
	}

	return nil
}

func (k *K0sControlPlane) Args() ([]string, error) {
	var args []string

	// Generate a new k0s config
	_, err := utils.SH("k0s config create > /etc/k0s/k0s.yaml")
	if err != nil {
		return args, err
	}
	args = append(args, "--config /etc/k0s/k0s.yaml")

	data, err := os.ReadFile("/etc/k0s/k0s.yaml")
	if err != nil {
		return nil, err
	}

	var k0sConfig map[any]any
	err = yaml.Unmarshal(data, &k0sConfig)
	if err != nil {
		return args, err
	}

	// check if the k0s config has an api address
	spec, ok := k0sConfig["spec"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have a spec")
	}
	api, ok := spec["api"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have an api")
	}
	// by default k0s uses the first IP address of the machine as the api address, but we want to use the edgevpn IP
	api["address"] = k.IP()

	spec["api"] = api

	network, ok := spec["network"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have a network")
	}
	kubeRouter, ok := network["kuberouter"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have a kuberouter")
	}

	// by default k0s uses the port 8080 for the metrics but this conflicts with the edgevpn API port
	kubeRouter["metricsPort"] = 9090
	network["kuberouter"] = kubeRouter
	spec["network"] = network

	storage, ok := spec["storage"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have a storage")
	}
	etcd, ok := storage["etcd"].(map[any]any)
	if !ok {
		return args, errors.New("k0s config does not have a etcd")
	}
	// just like the api address, we want to use the edgevpn IP for the etcd peer address
	etcd["peerAddress"] = k.IP()

	storage["etcd"] = etcd
	spec["storage"] = storage

	k0sConfig["spec"] = spec

	// write the k0s config back to the file
	data, err = yaml.Marshal(k0sConfig)
	if err != nil {
		return args, err
	}
	err = os.WriteFile("/etc/k0s/k0s.yaml", data, 0644)
	if err != nil {
		return args, err
	}

	pconfig := k.ProviderConfig()
	if !pconfig.P2P.UseVPNWithKubernetes() {
		return args, errors.New("Having a VPN but not using it for Kubernetes is not yet supported with k0s")
	}

	if pconfig.KubeVIP.IsEnabled() {
		return args, errors.New("KubeVIP is not yet supported with k0s")
	}

	if pconfig.P2P.Auto.HA.ExternalDB != "" {
		return args, errors.New("ExternalDB is not yet supported with k0s")
	}

	if k.HA() {
		args = append(args, "--token-file /etc/k0s/token")
	}

	// when we start implementing this functionality, remember to use
	// AppendArgs, and not just return the args here, this is because the
	// function understands if it needs to append or replace the args

	return args, nil
}

func (k *K0sControlPlane) EnvUnit() string {
	return machine.K0sEnvUnit("k0scontroller")
}

func (k *K0sControlPlane) Service() (machine.Service, error) {
	return machine.K0s()
}
func (k *K0sWorker) Service() (machine.Service, error) {
	return machine.K0sWorker()
}

func (k *K0sControlPlane) Token() (string, error) {
	return k.RoleConfig().Client.Get("controllertoken", "token")
}

func (k *K0sWorker) Token() (string, error) {
	return k.RoleConfig().Client.Get("workertoken", "token")
}

func (k *K0sControlPlane) GenerateEnv() (env map[string]string) {
	env = make(map[string]string)

	if k.HA() && !k.ClusterInit() {
		nodeToken, _ := k.Token()
		env["K0S_TOKEN"] = nodeToken
	}

	pConfig := k.ProviderConfig()

	if pConfig.K0s.ReplaceEnv {
		env = pConfig.K0s.Env
	} else {
		// Override opts with user-supplied
		for k, v := range pConfig.K0s.Env {
			env[k] = v
		}
	}

	return env
}

func (k *K0sControlPlane) ProviderConfig() *providerConfig.Config {
	return k.providerConfig
}

func (k *K0sWorker) ProviderConfig() *providerConfig.Config {
	return k.providerConfig
}

func (k *K0sControlPlane) SetRoleConfig(c *service.RoleConfig) {
	k.roleConfig = c
}

func (k *K0sWorker) SetRoleConfig(c *service.RoleConfig) {
	k.roleConfig = c
}

func (k *K0sControlPlane) RoleConfig() *service.RoleConfig {
	return k.roleConfig
}

func (k *K0sWorker) RoleConfig() *service.RoleConfig {
	return k.roleConfig
}

func (k *K0sControlPlane) HA() bool {
	return k.role == common.RoleControlPlaneHA
}

func (k *K0sControlPlane) ClusterInit() bool {
	return k.role == common.RoleControlPlaneClusterInit
}

func (k *K0sControlPlane) IP() string {
	return k.ip
}

func (k *K0sWorker) IP() string {
	return k.ip
}

func (k *K0sControlPlane) PropagateData() error {
	c := k.RoleConfig()
	controllerToken, err := utils.SH("k0s token create --role=controller") //nolint:errcheck
	if err != nil {
		c.Logger.Errorf("failed to create controller token: %s", err)
	}

	// we don't want to set the output if there is an error
	if err == nil && controllerToken != "" {
		err := c.Client.Set("controllertoken", "token", strings.TrimSuffix(controllerToken, "\n"))
		if err != nil {
			c.Logger.Error(err)
		}
	}

	workerToken, err := utils.SH("k0s token create --role=worker") //nolint:errcheck
	if err != nil {
		c.Logger.Errorf("failed to create worker token: %s", err)
	}
	// we don't want to set the output if there is an error
	if err == nil && workerToken != "" {
		err := c.Client.Set("workertoken", "token", strings.TrimSuffix(workerToken, "\n"))
		if err != nil {
			c.Logger.Error(err)
		}
	}

	kubeconfig, err := utils.SH("k0s config create") //nolint:errcheck
	if err != nil {
		c.Logger.Error(err)
		return err
	}
	if kubeconfig != "" {
		err := c.Client.Set("kubeconfig", "control-plane", base64.RawURLEncoding.EncodeToString([]byte(kubeconfig)))
		if err != nil {
			c.Logger.Error(err)
		}
	}

	return nil
}

func (k *K0sWorker) Args() ([]string, error) {
	pconfig := k.ProviderConfig()
	k0sConfig := pconfig.K0sWorker
	args := []string{"--token-file /etc/k0s/token"}

	if k0sConfig.ReplaceArgs {
		args = k0sConfig.Args
	} else {
		args = append(args, k0sConfig.Args...)
	}

	return args, nil
}

func (k *K0sControlPlane) SetupHAToken() error {
	controlPlaneToken, err := k.Token()
	if err != nil {
		return err
	}

	if controlPlaneToken == "" {
		return errors.New("control plane token is not there")
	}

	if err := os.WriteFile("/etc/k0s/token", []byte(controlPlaneToken), 0644); err != nil {
		return err
	}

	return nil
}

func (k *K0sWorker) SetupWorker(_, nodeToken string) error {
	if err := os.WriteFile("/etc/k0s/token", []byte(nodeToken), 0644); err != nil {
		return err
	}

	return nil
}

func (k *K0sControlPlane) Role() string {
	return "controller"
}

func (k *K0sWorker) Role() string {
	return "worker"
}

func (k *K0sControlPlane) ServiceName() string {
	return "k0scontroller"
}

func (k *K0sWorker) ServiceName() string {
	return "k0sworker"
}

func (k *K0sControlPlane) Env() map[string]string {
	c := k.ProviderConfig()
	return c.K0s.Env
}

func (k *K0sWorker) Env() map[string]string {
	c := k.ProviderConfig()
	return c.K0sWorker.Env
}

func (k *K0sControlPlane) EnvFile() string {
	return machine.K0sEnvUnit(k.ServiceName())
}

func (k *K0sWorker) EnvFile() string {
	return machine.K0sEnvUnit(k.ServiceName())
}

func (k *K0sControlPlane) SetRole(role string) {
	k.role = role
}

func (k *K0sWorker) SetRole(role string) {
	k.role = role
}

func (k *K0sControlPlane) SetIP(ip string) {
	k.ip = ip
}

func (k *K0sWorker) SetIP(ip string) {
	k.ip = ip
}

func (k *K0sControlPlane) GuessInterface() {
	// not used in k0s
}

func (k *K0sWorker) GuessInterface() {
	// not used in k0s
}

func (k *K0sControlPlane) Distro() string {
	return K0sDistroName
}

func (k *K0sWorker) Distro() string {
	return K0sDistroName
}