package aws

import (
	"fmt"
	"log"
	"regexp"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/rds"
	"github.com/hashicorp/terraform/helper/resource"
	"github.com/hashicorp/terraform/helper/schema"
)

func resourceAwsDbSubnetGroup() *schema.Resource {
	return &schema.Resource{
		Create: resourceAwsDbSubnetGroupCreate,
		Read:   resourceAwsDbSubnetGroupRead,
		Update: resourceAwsDbSubnetGroupUpdate,
		Delete: resourceAwsDbSubnetGroupDelete,
		Importer: &schema.ResourceImporter{
			State: schema.ImportStatePassthrough,
		},

		Schema: map[string]*schema.Schema{
			"arn": &schema.Schema{
				Type:     schema.TypeString,
				Computed: true,
			},

			"name": &schema.Schema{
				Type:         schema.TypeString,
				ForceNew:     true,
				Required:     true,
				ValidateFunc: validateSubnetGroupName,
			},

			"description": &schema.Schema{
				Type:     schema.TypeString,
				Optional: true,
				Default:  "Managed by Terraform",
			},

			"subnet_ids": &schema.Schema{
				Type:     schema.TypeSet,
				Required: true,
				Elem:     &schema.Schema{Type: schema.TypeString},
				Set:      schema.HashString,
			},

			"tags": tagsSchema(),
		},
	}
}

func resourceAwsDbSubnetGroupCreate(d *schema.ResourceData, meta interface{}) error {
	rdsconn := meta.(*AWSClient).rdsconn
	tags := tagsFromMapRDS(d.Get("tags").(map[string]interface{}))

	subnetIdsSet := d.Get("subnet_ids").(*schema.Set)
	subnetIds := make([]*string, subnetIdsSet.Len())
	for i, subnetId := range subnetIdsSet.List() {
		subnetIds[i] = aws.String(subnetId.(string))
	}

	createOpts := rds.CreateDBSubnetGroupInput{
		DBSubnetGroupName:        aws.String(d.Get("name").(string)),
		DBSubnetGroupDescription: aws.String(d.Get("description").(string)),
		SubnetIds:                subnetIds,
		Tags:                     tags,
	}

	log.Printf("[DEBUG] Create DB Subnet Group: %#v", createOpts)
	_, err := rdsconn.CreateDBSubnetGroup(&createOpts)
	if err != nil {
		return fmt.Errorf("Error creating DB Subnet Group: %s", err)
	}

	d.SetId(*createOpts.DBSubnetGroupName)
	log.Printf("[INFO] DB Subnet Group ID: %s", d.Id())
	return resourceAwsDbSubnetGroupRead(d, meta)
}

func resourceAwsDbSubnetGroupRead(d *schema.ResourceData, meta interface{}) error {
	rdsconn := meta.(*AWSClient).rdsconn

	describeOpts := rds.DescribeDBSubnetGroupsInput{
		DBSubnetGroupName: aws.String(d.Id()),
	}

	describeResp, err := rdsconn.DescribeDBSubnetGroups(&describeOpts)
	if err != nil {
		if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "DBSubnetGroupNotFoundFault" {
			// Update state to indicate the db subnet no longer exists.
			d.SetId("")
			return nil
		}
		return err
	}

	if len(describeResp.DBSubnetGroups) == 0 {
		return fmt.Errorf("Unable to find DB Subnet Group: %#v", describeResp.DBSubnetGroups)
	}

	var subnetGroup *rds.DBSubnetGroup
	for _, s := range describeResp.DBSubnetGroups {
		// AWS is down casing the name provided, so we compare lower case versions
		// of the names. We lower case both our name and their name in the check,
		// incase they change that someday.
		if strings.ToLower(d.Id()) == strings.ToLower(*s.DBSubnetGroupName) {
			subnetGroup = describeResp.DBSubnetGroups[0]
		}
	}

	if subnetGroup.DBSubnetGroupName == nil {
		return fmt.Errorf("Unable to find DB Subnet Group: %#v", describeResp.DBSubnetGroups)
	}

	d.Set("name", subnetGroup.DBSubnetGroupName)
	d.Set("description", subnetGroup.DBSubnetGroupDescription)

	subnets := make([]string, 0, len(subnetGroup.Subnets))
	for _, s := range subnetGroup.Subnets {
		subnets = append(subnets, *s.SubnetIdentifier)
	}
	d.Set("subnet_ids", subnets)

	// list tags for resource
	// set tags
	conn := meta.(*AWSClient).rdsconn
	arn, err := buildRDSsubgrpARN(d.Id(), meta.(*AWSClient).accountid, meta.(*AWSClient).region)
	if err != nil {
		log.Printf("[DEBUG] Error building ARN for DB Subnet Group, not setting Tags for group %s", *subnetGroup.DBSubnetGroupName)
	} else {
		d.Set("arn", arn)
		resp, err := conn.ListTagsForResource(&rds.ListTagsForResourceInput{
			ResourceName: aws.String(arn),
		})

		if err != nil {
			log.Printf("[DEBUG] Error retreiving tags for ARN: %s", arn)
		}

		var dt []*rds.Tag
		if len(resp.TagList) > 0 {
			dt = resp.TagList
		}
		d.Set("tags", tagsToMapRDS(dt))
	}

	return nil
}

func resourceAwsDbSubnetGroupUpdate(d *schema.ResourceData, meta interface{}) error {
	conn := meta.(*AWSClient).rdsconn
	if d.HasChange("subnet_ids") || d.HasChange("description") {
		_, n := d.GetChange("subnet_ids")
		if n == nil {
			n = new(schema.Set)
		}
		ns := n.(*schema.Set)

		var sIds []*string
		for _, s := range ns.List() {
			sIds = append(sIds, aws.String(s.(string)))
		}

		_, err := conn.ModifyDBSubnetGroup(&rds.ModifyDBSubnetGroupInput{
			DBSubnetGroupName:        aws.String(d.Id()),
			DBSubnetGroupDescription: aws.String(d.Get("description").(string)),
			SubnetIds:                sIds,
		})

		if err != nil {
			return err
		}
	}

	if arn, err := buildRDSsubgrpARN(d.Id(), meta.(*AWSClient).accountid, meta.(*AWSClient).region); err == nil {
		if err := setTagsRDS(conn, d, arn); err != nil {
			return err
		} else {
			d.SetPartial("tags")
		}
	}

	return resourceAwsDbSubnetGroupRead(d, meta)
}

func resourceAwsDbSubnetGroupDelete(d *schema.ResourceData, meta interface{}) error {
	stateConf := &resource.StateChangeConf{
		Pending:    []string{"pending"},
		Target:     []string{"destroyed"},
		Refresh:    resourceAwsDbSubnetGroupDeleteRefreshFunc(d, meta),
		Timeout:    3 * time.Minute,
		MinTimeout: 1 * time.Second,
	}
	_, err := stateConf.WaitForState()
	return err
}

func resourceAwsDbSubnetGroupDeleteRefreshFunc(
	d *schema.ResourceData,
	meta interface{}) resource.StateRefreshFunc {
	rdsconn := meta.(*AWSClient).rdsconn

	return func() (interface{}, string, error) {

		deleteOpts := rds.DeleteDBSubnetGroupInput{
			DBSubnetGroupName: aws.String(d.Id()),
		}

		if _, err := rdsconn.DeleteDBSubnetGroup(&deleteOpts); err != nil {
			rdserr, ok := err.(awserr.Error)
			if !ok {
				return d, "error", err
			}

			if rdserr.Code() != "DBSubnetGroupNotFoundFault" {
				return d, "error", err
			}
		}

		return d, "destroyed", nil
	}
}

func buildRDSsubgrpARN(identifier, accountid, region string) (string, error) {
	if accountid == "" {
		return "", fmt.Errorf("Unable to construct RDS ARN because of missing AWS Account ID")
	}
	arn := fmt.Sprintf("arn:aws:rds:%s:%s:subgrp:%s", region, accountid, identifier)
	return arn, nil

}

func validateSubnetGroupName(v interface{}, k string) (ws []string, errors []error) {
	value := v.(string)
	if !regexp.MustCompile(`^[ .0-9a-z-_]+$`).MatchString(value) {
		errors = append(errors, fmt.Errorf(
			"only lowercase alphanumeric characters, hyphens, underscores, periods, and spaces allowed in %q", k))
	}
	if len(value) > 255 {
		errors = append(errors, fmt.Errorf(
			"%q cannot be longer than 255 characters", k))
	}
	if regexp.MustCompile(`(?i)^default$`).MatchString(value) {
		errors = append(errors, fmt.Errorf(
			"%q is not allowed as %q", "Default", k))
	}
	return
}