package orchestrator

import (
	"context"
	"log"

	"provisioning/internal/config"
	"provisioning/internal/infra"
	"provisioning/internal/model"
	"provisioning/internal/statemachine"
	"provisioning/internal/store"
)

type HostOrchestrator struct {
	Runner      *Runner
	Hosts       *store.Hosts
	Ops         *store.Operations
	Locks       *store.Locks
	Cluster     *ClusterJoiner
	InfraClient *infra.Client
	Config      *config.Config
	ServerTypes *config.ServerTypeRegistry
}

// PrepareRebuild generates an ephemeral SSH key pair and stores it on the host.
// The public key will be injected into the Proxmox answer file.
func (o *HostOrchestrator) PrepareRebuild(ctx context.Context, hostID int64) error {
	kp, err := GenerateEphemeralKey()
	if err != nil {
		return err
	}
	return o.Hosts.SetEphemeralKey(ctx, hostID, kp.PrivateKey, kp.PublicKey)
}

func (o *HostOrchestrator) HandlePhoneHome(ctx context.Context, hostID int64, ip string, hardwareID string) {
	o.Runner.LogActivity(ctx, hostID, model.LogInfo, "orchestrator", "Phone-home: updating IP to "+ip)
	if err := o.Hosts.UpdateIP(ctx, hostID, ip, hardwareID); err != nil {
		log.Printf("host %d: failed to update IP: %v", hostID, err)
		o.Runner.FailHost(ctx, hostID, "failed to update IP: "+err.Error())
		return
	}

	if _, err := o.Runner.Transition(ctx, hostID, statemachine.TriggerPhoneHome); err != nil {
		log.Printf("host %d: phone-home transition failed: %v", hostID, err)
		return
	}

	go o.postPhoneHome(hostID, ip, hardwareID)
}

func (o *HostOrchestrator) postPhoneHome(hostID int64, ip string, hardwareID string) {
	ctx := context.Background()

	host, err := o.Hosts.Get(ctx, hostID)
	if err != nil {
		log.Printf("host %d: failed to get host for cluster join: %v", hostID, err)
		o.Runner.FailHost(ctx, hostID, "get host: "+err.Error())
		return
	}

	privateKey, publicKey, err := o.Hosts.GetEphemeralKey(ctx, hostID)
	if err != nil || privateKey == "" {
		log.Printf("host %d: no ephemeral key available: %v", hostID, err)
		o.Runner.FailHost(ctx, hostID, "no ephemeral SSH key")
		return
	}

	if _, err := o.Runner.Transition(ctx, hostID, statemachine.TriggerClusterJoinStart); err != nil {
		log.Printf("host %d: cluster join start transition failed: %v", hostID, err)
		return
	}

	o.Runner.LogActivity(ctx, hostID, model.LogInfo, "orchestrator", "Starting cluster join via "+o.Cluster.ExistingNode)
	if err := o.Cluster.Join(ctx, ip, privateKey, publicKey); err != nil {
		log.Printf("host %d: cluster join failed: %v", hostID, err)
		o.Runner.FailHost(ctx, hostID, "cluster join: "+err.Error())
		return
	}
	o.Runner.LogActivity(ctx, hostID, model.LogInfo, "orchestrator", "Cluster join complete")

	_ = o.Hosts.ClearEphemeralKey(ctx, hostID)

	o.Runner.LogActivity(ctx, hostID, model.LogInfo, "orchestrator", "Registering with infrastructure API")
	if err := o.registerInfra(ctx, host, ip, hardwareID); err != nil {
		log.Printf("host %d: infra registration failed: %v", hostID, err)
		o.Runner.FailHost(ctx, hostID, "infra registration: "+err.Error())
		return
	}

	if _, err := o.Runner.Transition(ctx, hostID, statemachine.TriggerJoinComplete); err != nil {
		log.Printf("host %d: join complete transition failed: %v", hostID, err)
		return
	}

	op, err := o.Ops.GetActive(ctx, hostID)
	if err == nil {
		_ = o.Ops.Complete(ctx, op.ID)
	}
	_ = o.Locks.Release(ctx, hostID)
	o.Runner.LogActivity(ctx, hostID, model.LogInfo, "orchestrator", "Provisioning complete")
	log.Printf("host %d (%s): provisioning complete", hostID, host.Hostname)
}

func (o *HostOrchestrator) registerInfra(ctx context.Context, host *model.Host, ip string, hardwareID string) error {
	if o.InfraClient == nil {
		return nil
	}

	st, _ := o.ServerTypes.Get(host.ServerType)
	serverTypeID := o.Config.Infrastructure.ServerTypeMap[host.ServerType]

	infraID, err := o.InfraClient.CreateHost(ctx, infra.CreateHostRequest{
		HardwareID:   hardwareID,
		Hostname:     host.Hostname,
		AssetID:      host.Hostname,
		RoomID:       o.Config.Infrastructure.RoomID,
		ServerTypeID: serverTypeID,
	})
	if err != nil {
		return err
	}

	if err := o.Hosts.UpdateInfraID(ctx, host.ID, infraID); err != nil {
		return err
	}

	_ = o.InfraClient.CreateInterface(ctx, infra.CreateInterfaceRequest{
		HostID:     int(infraID),
		Name:       st.ManagementNIC,
		MACAddress: host.MAC,
		IPAddress:  ip,
	})

	return nil
}