package openstack

import (
	"fmt"
	"log"
	"time"

	"github.com/hashicorp/terraform/helper/resource"
	"github.com/hashicorp/terraform/helper/schema"

	"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/lbaas_v2/listeners"
)

func resourceListenerV2() *schema.Resource {
	return &schema.Resource{
		Create: resourceListenerV2Create,
		Read:   resourceListenerV2Read,
		Update: resourceListenerV2Update,
		Delete: resourceListenerV2Delete,
		Importer: &schema.ResourceImporter{
			State: schema.ImportStatePassthrough,
		},

		Timeouts: &schema.ResourceTimeout{
			Create: schema.DefaultTimeout(10 * time.Minute),
			Update: schema.DefaultTimeout(10 * time.Minute),
			Delete: schema.DefaultTimeout(10 * time.Minute),
		},

		Schema: map[string]*schema.Schema{
			"region": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
				ForceNew: true,
			},

			"protocol": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
				ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
					value := v.(string)
					if value != "TCP" && value != "HTTP" && value != "HTTPS" && value != "TERMINATED_HTTPS" {
						errors = append(errors, fmt.Errorf(
							"Only 'TCP', 'HTTP', 'HTTPS' and 'TERMINATED_HTTPS' are supported values for 'protocol'"))
					}
					return
				},
			},

			"protocol_port": {
				Type:     schema.TypeInt,
				Required: true,
				ForceNew: true,
			},

			"tenant_id": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
				ForceNew: true,
			},

			"loadbalancer_id": {
				Type:     schema.TypeString,
				Required: true,
				ForceNew: true,
			},

			"name": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
			},

			"default_pool_id": {
				Type:     schema.TypeString,
				Optional: true,
				Computed: true,
			},

			"description": {
				Type:     schema.TypeString,
				Optional: true,
			},

			"connection_limit": {
				Type:     schema.TypeInt,
				Optional: true,
				Computed: true,
			},

			"default_tls_container_ref": {
				Type:     schema.TypeString,
				Optional: true,
			},

			"sni_container_refs": {
				Type:     schema.TypeList,
				Optional: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
			},

			"admin_state_up": {
				Type:     schema.TypeBool,
				Default:  true,
				Optional: true,
			},
		},
	}
}

func resourceListenerV2Create(d *schema.ResourceData, meta interface{}) error {
	config := meta.(*Config)
	lbClient, err := chooseLBV2Client(d, config)
	if err != nil {
		return fmt.Errorf("Error creating OpenStack networking client: %s", err)
	}

	adminStateUp := d.Get("admin_state_up").(bool)
	var sniContainerRefs []string
	if raw, ok := d.GetOk("sni_container_refs"); ok {
		for _, v := range raw.([]interface{}) {
			sniContainerRefs = append(sniContainerRefs, v.(string))
		}
	}
	createOpts := listeners.CreateOpts{
		Protocol:               listeners.Protocol(d.Get("protocol").(string)),
		ProtocolPort:           d.Get("protocol_port").(int),
		TenantID:               d.Get("tenant_id").(string),
		LoadbalancerID:         d.Get("loadbalancer_id").(string),
		Name:                   d.Get("name").(string),
		DefaultPoolID:          d.Get("default_pool_id").(string),
		Description:            d.Get("description").(string),
		DefaultTlsContainerRef: d.Get("default_tls_container_ref").(string),
		SniContainerRefs:       sniContainerRefs,
		AdminStateUp:           &adminStateUp,
	}

	if v, ok := d.GetOk("connection_limit"); ok {
		connectionLimit := v.(int)
		createOpts.ConnLimit = &connectionLimit
	}

	log.Printf("[DEBUG] Create Options: %#v", createOpts)

	lbID := createOpts.LoadbalancerID
	timeout := d.Timeout(schema.TimeoutCreate)

	// Wait for LoadBalancer to become active before continuing
	err = waitForLBV2LoadBalancer(lbClient, lbID, "ACTIVE", lbPendingStatuses, timeout)
	if err != nil {
		return err
	}

	log.Printf("[DEBUG] Attempting to create listener")
	var listener *listeners.Listener
	err = resource.Retry(timeout, func() *resource.RetryError {
		listener, err = listeners.Create(lbClient, createOpts).Extract()
		if err != nil {
			return checkForRetryableError(err)
		}
		return nil
	})

	if err != nil {
		return fmt.Errorf("Error creating listener: %s", err)
	}

	// Wait for the listener to become ACTIVE.
	err = waitForLBV2Listener(lbClient, listener, "ACTIVE", lbPendingStatuses, timeout)
	if err != nil {
		return err
	}

	d.SetId(listener.ID)

	return resourceListenerV2Read(d, meta)
}

func resourceListenerV2Read(d *schema.ResourceData, meta interface{}) error {
	config := meta.(*Config)
	lbClient, err := chooseLBV2Client(d, config)
	if err != nil {
		return fmt.Errorf("Error creating OpenStack networking client: %s", err)
	}

	listener, err := listeners.Get(lbClient, d.Id()).Extract()
	if err != nil {
		return CheckDeleted(d, err, "listener")
	}

	log.Printf("[DEBUG] Retrieved listener %s: %#v", d.Id(), listener)

	// Required by import
	if len(listener.Loadbalancers) > 0 {
		d.Set("loadbalancer_id", listener.Loadbalancers[0].ID)
	}

	d.Set("name", listener.Name)
	d.Set("protocol", listener.Protocol)
	d.Set("tenant_id", listener.TenantID)
	d.Set("description", listener.Description)
	d.Set("protocol_port", listener.ProtocolPort)
	d.Set("admin_state_up", listener.AdminStateUp)
	d.Set("default_pool_id", listener.DefaultPoolID)
	d.Set("connection_limit", listener.ConnLimit)
	d.Set("sni_container_refs", listener.SniContainerRefs)
	d.Set("default_tls_container_ref", listener.DefaultTlsContainerRef)
	d.Set("region", GetRegion(d, config))

	return nil
}

func resourceListenerV2Update(d *schema.ResourceData, meta interface{}) error {
	config := meta.(*Config)
	lbClient, err := chooseLBV2Client(d, config)
	if err != nil {
		return fmt.Errorf("Error creating OpenStack networking client: %s", err)
	}

	// Get a clean copy of the listener.
	listener, err := listeners.Get(lbClient, d.Id()).Extract()
	if err != nil {
		return fmt.Errorf("Unable to retrieve listener %s: %s", d.Id(), err)
	}

	var updateOpts listeners.UpdateOpts
	if d.HasChange("name") {
		name := d.Get("name").(string)
		updateOpts.Name = &name
	}
	if d.HasChange("description") {
		description := d.Get("description").(string)
		updateOpts.Description = &description
	}
	if d.HasChange("connection_limit") {
		connLimit := d.Get("connection_limit").(int)
		updateOpts.ConnLimit = &connLimit
	}
	if d.HasChange("default_pool_id") {
		defaultPoolID := d.Get("default_pool_id").(string)
		updateOpts.DefaultPoolID = &defaultPoolID
	}
	if d.HasChange("default_tls_container_ref") {
		updateOpts.DefaultTlsContainerRef = d.Get("default_tls_container_ref").(string)
	}
	if d.HasChange("sni_container_refs") {
		var sniContainerRefs []string
		if raw, ok := d.GetOk("sni_container_refs"); ok {
			for _, v := range raw.([]interface{}) {
				sniContainerRefs = append(sniContainerRefs, v.(string))
			}
		}
		updateOpts.SniContainerRefs = sniContainerRefs
	}
	if d.HasChange("admin_state_up") {
		asu := d.Get("admin_state_up").(bool)
		updateOpts.AdminStateUp = &asu
	}

	// Wait for the listener to become ACTIVE.
	timeout := d.Timeout(schema.TimeoutUpdate)
	err = waitForLBV2Listener(lbClient, listener, "ACTIVE", lbPendingStatuses, timeout)
	if err != nil {
		return err
	}

	log.Printf("[DEBUG] Updating listener %s with options: %#v", d.Id(), updateOpts)
	err = resource.Retry(timeout, func() *resource.RetryError {
		_, err = listeners.Update(lbClient, d.Id(), updateOpts).Extract()
		if err != nil {
			return checkForRetryableError(err)
		}
		return nil
	})

	if err != nil {
		return fmt.Errorf("Error updating listener %s: %s", d.Id(), err)
	}

	// Wait for the listener to become ACTIVE.
	err = waitForLBV2Listener(lbClient, listener, "ACTIVE", lbPendingStatuses, timeout)
	if err != nil {
		return err
	}

	return resourceListenerV2Read(d, meta)

}

func resourceListenerV2Delete(d *schema.ResourceData, meta interface{}) error {
	config := meta.(*Config)
	lbClient, err := chooseLBV2Client(d, config)
	if err != nil {
		return fmt.Errorf("Error creating OpenStack networking client: %s", err)
	}

	// Get a clean copy of the listener.
	listener, err := listeners.Get(lbClient, d.Id()).Extract()
	if err != nil {
		return CheckDeleted(d, err, "Unable to retrieve listener")
	}

	timeout := d.Timeout(schema.TimeoutDelete)

	log.Printf("[DEBUG] Deleting listener %s", d.Id())
	err = resource.Retry(timeout, func() *resource.RetryError {
		err = listeners.Delete(lbClient, d.Id()).ExtractErr()
		if err != nil {
			return checkForRetryableError(err)
		}
		return nil
	})

	if err != nil {
		return CheckDeleted(d, err, "Error deleting listener")
	}

	// Wait for the listener to become DELETED.
	err = waitForLBV2Listener(lbClient, listener, "DELETED", lbPendingDeleteStatuses, timeout)
	if err != nil {
		return err
	}

	return nil
}