package aws

import (
	"fmt"
	"math/rand"
	"testing"
	"time"

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

	"github.com/awslabs/aws-sdk-go/aws"
	"github.com/awslabs/aws-sdk-go/service/s3"
)

func TestAccAWSS3Bucket_basic(t *testing.T) {
	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckAWSS3BucketDestroy,
		Steps: []resource.TestStep{
			resource.TestStep{
				Config: testAccAWSS3BucketConfig,
				Check: resource.ComposeTestCheckFunc(
					testAccCheckAWSS3BucketExists("aws_s3_bucket.bucket"),
					resource.TestCheckResourceAttr(
						"aws_s3_bucket.bucket", "website_endpoint", ""),
				),
			},
		},
	})
}

func TestAccAWSS3Bucket_Website(t *testing.T) {
	resource.Test(t, resource.TestCase{
		PreCheck:     func() { testAccPreCheck(t) },
		Providers:    testAccProviders,
		CheckDestroy: testAccCheckAWSS3BucketDestroy,
		Steps: []resource.TestStep{
			resource.TestStep{
				Config: testAccAWSS3BucketWebsiteConfig,
				Check: resource.ComposeTestCheckFunc(
					testAccCheckAWSS3BucketExists("aws_s3_bucket.bucket"),
					testAccCheckAWSS3BucketWebsite(
						"aws_s3_bucket.bucket", "index.html", ""),
					resource.TestCheckResourceAttr(
						"aws_s3_bucket.bucket", "website_endpoint", testAccWebsiteEndpoint),
				),
			},
			resource.TestStep{
				Config: testAccAWSS3BucketWebsiteConfigWithError,
				Check: resource.ComposeTestCheckFunc(
					testAccCheckAWSS3BucketExists("aws_s3_bucket.bucket"),
					testAccCheckAWSS3BucketWebsite(
						"aws_s3_bucket.bucket", "index.html", "error.html"),
					resource.TestCheckResourceAttr(
						"aws_s3_bucket.bucket", "website_endpoint", testAccWebsiteEndpoint),
				),
			},
			resource.TestStep{
				Config: testAccAWSS3BucketConfig,
				Check: resource.ComposeTestCheckFunc(
					testAccCheckAWSS3BucketExists("aws_s3_bucket.bucket"),
					testAccCheckAWSS3BucketWebsite(
						"aws_s3_bucket.bucket", "", ""),
					resource.TestCheckResourceAttr(
						"aws_s3_bucket.bucket", "website_endpoint", ""),
				),
			},
		},
	})
}

func testAccCheckAWSS3BucketDestroy(s *terraform.State) error {
	conn := testAccProvider.Meta().(*AWSClient).s3conn

	for _, rs := range s.RootModule().Resources {
		if rs.Type != "aws_s3_bucket" {
			continue
		}
		_, err := conn.DeleteBucket(&s3.DeleteBucketInput{
			Bucket: aws.String(rs.Primary.ID),
		})
		if err != nil {
			return err
		}
	}
	return nil
}

func testAccCheckAWSS3BucketExists(n string) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, ok := s.RootModule().Resources[n]
		if !ok {
			return fmt.Errorf("Not found: %s", n)
		}

		if rs.Primary.ID == "" {
			return fmt.Errorf("No S3 Bucket ID is set")
		}

		conn := testAccProvider.Meta().(*AWSClient).s3conn
		_, err := conn.HeadBucket(&s3.HeadBucketInput{
			Bucket: aws.String(rs.Primary.ID),
		})

		if err != nil {
			return fmt.Errorf("S3Bucket error: %v", err)
		}
		return nil
	}
}

func testAccCheckAWSS3BucketWebsite(n string, indexDoc string, errorDoc string) resource.TestCheckFunc {
	return func(s *terraform.State) error {
		rs, _ := s.RootModule().Resources[n]
		conn := testAccProvider.Meta().(*AWSClient).s3conn

		out, err := conn.GetBucketWebsite(&s3.GetBucketWebsiteInput{
			Bucket: aws.String(rs.Primary.ID),
		})

		if err != nil {
			if indexDoc == "" {
				// If we want to assert that the website is not there, than
				// this error is expected
				return nil
			} else {
				return fmt.Errorf("S3BucketWebsite error: %v", err)
			}
		}

		if *out.IndexDocument.Suffix != indexDoc {
			if out.IndexDocument.Suffix != nil {
				return fmt.Errorf("bad index document suffix: %s", *out.IndexDocument.Suffix)
			}
			return fmt.Errorf("bad index document suffix, is nil")
		}

		if v := out.ErrorDocument; v == nil {
			if errorDoc != "" {
				return fmt.Errorf("bad error doc, found nil, expected: %s", errorDoc)
			}
		} else {
			if *v.Key != errorDoc {
				return fmt.Errorf("bad error doc, expected: %s, got %#v", errorDoc, out.ErrorDocument)
			}
		}

		return nil
	}
}

// These need a bit of randomness as the name can only be used once globally
// within AWS
var randInt = rand.New(rand.NewSource(time.Now().UnixNano())).Int()
var testAccWebsiteEndpoint = fmt.Sprintf("tf-test-bucket-%d.s3-website-us-west-2.amazonaws.com", randInt)
var testAccAWSS3BucketConfig = fmt.Sprintf(`
resource "aws_s3_bucket" "bucket" {
	bucket = "tf-test-bucket-%d"
	acl = "public-read"
}
`, randInt)

var testAccAWSS3BucketWebsiteConfig = fmt.Sprintf(`
resource "aws_s3_bucket" "bucket" {
	bucket = "tf-test-bucket-%d"
	acl = "public-read"

	website {
		index_document = "index.html"
	}
}
`, randInt)

var testAccAWSS3BucketWebsiteConfigWithError = fmt.Sprintf(`
resource "aws_s3_bucket" "bucket" {
	bucket = "tf-test-bucket-%d"
	acl = "public-read"

	website {
		index_document = "index.html"
		error_document = "error.html"
	}
}
`, randInt)