package cluster

import (
	"fmt"

	"context"

	"github.com/rancher/rke/hosts"
	"github.com/rancher/rke/log"
	"github.com/rancher/rke/pki"
	"github.com/rancher/rke/services"
	"github.com/sirupsen/logrus"
	"golang.org/x/sync/errgroup"
)

const (
	etcdRoleLabel   = "node-role.kubernetes.io/etcd"
	masterRoleLabel = "node-role.kubernetes.io/master"
	workerRoleLabel = "node-role.kubernetes.io/worker"
)

func (c *Cluster) TunnelHosts(ctx context.Context, local bool) error {
	if local {
		if err := c.EtcdHosts[0].TunnelUpLocal(ctx); err != nil {
			return fmt.Errorf("Failed to connect to docker for local host [%s]: %v", c.EtcdHosts[0].Address, err)
		}
		return nil
	}
	for i := range c.EtcdHosts {
		if err := c.EtcdHosts[i].TunnelUp(ctx, c.DockerDialerFactory); err != nil {
			return fmt.Errorf("Failed to set up SSH tunneling for Etcd host [%s]: %v", c.EtcdHosts[i].Address, err)
		}
	}
	for i := range c.ControlPlaneHosts {
		err := c.ControlPlaneHosts[i].TunnelUp(ctx, c.DockerDialerFactory)
		if err != nil {
			return fmt.Errorf("Failed to set up SSH tunneling for Control host [%s]: %v", c.ControlPlaneHosts[i].Address, err)
		}
	}
	for i := range c.WorkerHosts {
		if err := c.WorkerHosts[i].TunnelUp(ctx, c.DockerDialerFactory); err != nil {
			return fmt.Errorf("Failed to set up SSH tunneling for Worker host [%s]: %v", c.WorkerHosts[i].Address, err)
		}
	}
	return nil
}

func (c *Cluster) InvertIndexHosts() error {
	c.EtcdHosts = make([]*hosts.Host, 0)
	c.WorkerHosts = make([]*hosts.Host, 0)
	c.ControlPlaneHosts = make([]*hosts.Host, 0)
	for _, host := range c.Nodes {
		newHost := hosts.Host{
			RKEConfigNode: host,
			ToAddLabels:   map[string]string{},
			ToDelLabels:   map[string]string{},
			ToAddTaints:   []string{},
			ToDelTaints:   []string{},
		}
		for k, v := range host.Labels {
			newHost.ToAddLabels[k] = v
		}
		newHost.IgnoreDockerVersion = c.IgnoreDockerVersion

		for _, role := range host.Role {
			logrus.Debugf("Host: " + host.Address + " has role: " + role)
			switch role {
			case services.ETCDRole:
				newHost.IsEtcd = true
				newHost.ToAddLabels[etcdRoleLabel] = "true"
				c.EtcdHosts = append(c.EtcdHosts, &newHost)
			case services.ControlRole:
				newHost.IsControl = true
				newHost.ToAddLabels[masterRoleLabel] = "true"
				c.ControlPlaneHosts = append(c.ControlPlaneHosts, &newHost)
			case services.WorkerRole:
				newHost.IsWorker = true
				newHost.ToAddLabels[workerRoleLabel] = "true"
				c.WorkerHosts = append(c.WorkerHosts, &newHost)
			default:
				return fmt.Errorf("Failed to recognize host [%s] role %s", host.Address, role)
			}
		}
		if !newHost.IsEtcd {
			newHost.ToDelLabels[etcdRoleLabel] = "true"
		}
		if !newHost.IsControl {
			newHost.ToDelLabels[masterRoleLabel] = "true"
		}
		if !newHost.IsWorker {
			newHost.ToDelLabels[workerRoleLabel] = "true"
		}
	}
	return nil
}

func (c *Cluster) SetUpHosts(ctx context.Context) error {
	if c.Authentication.Strategy == X509AuthenticationProvider {
		log.Infof(ctx, "[certificates] Deploying kubernetes certificates to Cluster nodes")
		hosts := c.getUniqueHostList()
		var errgrp errgroup.Group

		for _, host := range hosts {
			runHost := host
			errgrp.Go(func() error {
				return pki.DeployCertificatesOnPlaneHost(ctx, runHost, c.EtcdHosts, c.Certificates, c.SystemImages.CertDownloader, c.PrivateRegistriesMap)
			})
		}
		if err := errgrp.Wait(); err != nil {
			return err
		}

		if err := pki.DeployAdminConfig(ctx, c.Certificates[pki.KubeAdminCertName].Config, c.LocalKubeConfigPath); err != nil {
			return err
		}
		log.Infof(ctx, "[certificates] Successfully deployed kubernetes certificates to Cluster nodes")
	}
	return nil
}

func CheckEtcdHostsChanged(kubeCluster, currentCluster *Cluster) error {
	if currentCluster != nil {
		etcdChanged := hosts.IsHostListChanged(currentCluster.EtcdHosts, kubeCluster.EtcdHosts)
		if etcdChanged {
			return fmt.Errorf("Adding or removing Etcd nodes is not supported")
		}
	}
	return nil
}