package google

import (
	"fmt"
	"regexp"
	"strings"

	"google.golang.org/api/googleapi"
)

const (
	resolveImageFamilyRegex = "[-_a-zA-Z0-9]*"
	resolveImageImageRegex  = "[-_a-zA-Z0-9]*"
)

var (
	resolveImageProjectImage           = regexp.MustCompile(fmt.Sprintf("projects/(%s)/global/images/(%s)$", ProjectRegex, resolveImageImageRegex))
	resolveImageProjectFamily          = regexp.MustCompile(fmt.Sprintf("projects/(%s)/global/images/family/(%s)$", ProjectRegex, resolveImageFamilyRegex))
	resolveImageGlobalImage            = regexp.MustCompile(fmt.Sprintf("^global/images/(%s)$", resolveImageImageRegex))
	resolveImageGlobalFamily           = regexp.MustCompile(fmt.Sprintf("^global/images/family/(%s)$", resolveImageFamilyRegex))
	resolveImageFamilyFamily           = regexp.MustCompile(fmt.Sprintf("^family/(%s)$", resolveImageFamilyRegex))
	resolveImageProjectImageShorthand  = regexp.MustCompile(fmt.Sprintf("^(%s)/(%s)$", ProjectRegex, resolveImageImageRegex))
	resolveImageProjectFamilyShorthand = regexp.MustCompile(fmt.Sprintf("^(%s)/(%s)$", ProjectRegex, resolveImageFamilyRegex))
	resolveImageFamily                 = regexp.MustCompile(fmt.Sprintf("^(%s)$", resolveImageFamilyRegex))
	resolveImageImage                  = regexp.MustCompile(fmt.Sprintf("^(%s)$", resolveImageImageRegex))
	resolveImageLink                   = regexp.MustCompile(fmt.Sprintf("^https://www.googleapis.com/compute/[a-z0-9]+/projects/(%s)/global/images/(%s)", ProjectRegex, resolveImageImageRegex))

	windowsSqlImage         = regexp.MustCompile("^sql-([0-9]{4})-([a-z]+)-windows-([0-9]{4})(?:-r([0-9]+))?-dc-v[0-9]+$")
	canonicalUbuntuLtsImage = regexp.MustCompile("^ubuntu-(minimal-)?([0-9]+)-")
)

// built-in projects to look for images/families containing the string
// on the left in
var imageMap = map[string]string{
	"centos":      "centos-cloud",
	"coreos":      "coreos-cloud",
	"debian":      "debian-cloud",
	"opensuse":    "opensuse-cloud",
	"rhel":        "rhel-cloud",
	"sles":        "suse-cloud",
	"ubuntu":      "ubuntu-os-cloud",
	"windows":     "windows-cloud",
	"windows-sql": "windows-sql-cloud",
}

func resolveImageImageExists(c *Config, project, name string) (bool, error) {
	if _, err := c.clientCompute.Images.Get(project, name).Do(); err == nil {
		return true, nil
	} else if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == 404 {
		return false, nil
	} else {
		return false, fmt.Errorf("Error checking if image %s exists: %s", name, err)
	}
}

func resolveImageFamilyExists(c *Config, project, name string) (bool, error) {
	if _, err := c.clientCompute.Images.GetFromFamily(project, name).Do(); err == nil {
		return true, nil
	} else if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == 404 {
		return false, nil
	} else {
		return false, fmt.Errorf("Error checking if family %s exists: %s", name, err)
	}
}

func sanityTestRegexMatches(expected int, got []string, regexType, name string) error {
	if len(got)-1 != expected { // subtract one, index zero is the entire matched expression
		return fmt.Errorf("Expected %d %s regex matches, got %d for %s", expected, regexType, len(got)-1, name)
	}
	return nil
}

// If the given name is a URL, return it.
// If it's in the form projects/{project}/global/images/{image}, return it
// If it's in the form projects/{project}/global/images/family/{family}, return it
// If it's in the form global/images/{image}, return it
// If it's in the form global/images/family/{family}, return it
// If it's in the form family/{family}, check if it's a family in the current project. If it is, return it as global/images/family/{family}.
//    If not, check if it could be a GCP-provided family, and if it exists. If it does, return it as projects/{project}/global/images/family/{family}.
// If it's in the form {project}/{family-or-image}, check if it's an image in the named project. If it is, return it as projects/{project}/global/images/{image}.
//    If not, check if it's a family in the named project. If it is, return it as projects/{project}/global/images/family/{family}.
// If it's in the form {family-or-image}, check if it's an image in the current project. If it is, return it as global/images/{image}.
//    If not, check if it could be a GCP-provided image, and if it exists. If it does, return it as projects/{project}/global/images/{image}.
//    If not, check if it's a family in the current project. If it is, return it as global/images/family/{family}.
//    If not, check if it could be a GCP-provided family, and if it exists. If it does, return it as projects/{project}/global/images/family/{family}
func resolveImage(c *Config, project, name string) (string, error) {
	var builtInProject string
	for k, v := range imageMap {
		if strings.Contains(name, k) {
			builtInProject = v
			break
		}
	}
	switch {
	case resolveImageLink.MatchString(name): // https://www.googleapis.com/compute/v1/projects/xyz/global/images/xyz
		return name, nil
	case resolveImageProjectImage.MatchString(name): // projects/xyz/global/images/xyz
		res := resolveImageProjectImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
	case resolveImageProjectFamily.MatchString(name): // projects/xyz/global/images/family/xyz
		res := resolveImageProjectFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
	case resolveImageGlobalImage.MatchString(name): // global/images/xyz
		res := resolveImageGlobalImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("global/images/%s", res[1]), nil
	case resolveImageGlobalFamily.MatchString(name): // global/images/family/xyz
		res := resolveImageGlobalFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("global/images/family/%s", res[1]), nil
	case resolveImageFamilyFamily.MatchString(name): // family/xyz
		res := resolveImageFamilyFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "family family", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, project, res[1]); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/family/%s", res[1]), nil
		}
		if builtInProject != "" {
			if ok, err := resolveImageFamilyExists(c, builtInProject, res[1]); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
			}
		}
	case resolveImageProjectImageShorthand.MatchString(name): // xyz/xyz
		res := resolveImageProjectImageShorthand.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project image shorthand", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageImageExists(c, res[1], res[2]); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
		}
		fallthrough // check if it's a family
	case resolveImageProjectFamilyShorthand.MatchString(name): // xyz/xyz
		res := resolveImageProjectFamilyShorthand.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project family shorthand", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, res[1], res[2]); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
		}
	case resolveImageImage.MatchString(name): // xyz
		res := resolveImageImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "image", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageImageExists(c, project, res[1]); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/%s", res[1]), nil
		}
		if builtInProject != "" {
			// check the images GCP provides
			if ok, err := resolveImageImageExists(c, builtInProject, res[1]); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/%s", builtInProject, res[1]), nil
			}
		}
		fallthrough // check if the name is a family, instead of an image
	case resolveImageFamily.MatchString(name): // xyz
		res := resolveImageFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "family", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, c.Project, res[1]); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/family/%s", res[1]), nil
		}
		if builtInProject != "" {
			// check the families GCP provides
			if ok, err := resolveImageFamilyExists(c, builtInProject, res[1]); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
			}
		}
	}
	return "", fmt.Errorf("Could not find image or family %s", name)
}

// resolvedImageSelfLink takes the output of resolveImage and coerces it into a self_link.
// In the event that a global/images/IMAGE or global/images/family/FAMILY reference is
// returned from resolveImage, providerProject will be used as the project for the self_link.
func resolvedImageSelfLink(providerProject, name string) (string, error) {
	switch {
	case resolveImageLink.MatchString(name): // https://www.googleapis.com/compute/v1/projects/xyz/global/images/xyz
		return name, nil
	case resolveImageProjectImage.MatchString(name): // projects/xyz/global/images/xyz
		res := resolveImageProjectImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/global/images/%s", res[1], res[2]), nil
	case resolveImageProjectFamily.MatchString(name): // projects/xyz/global/images/family/xyz
		res := resolveImageProjectFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/global/images/family/%s", res[1], res[2]), nil
	case resolveImageGlobalImage.MatchString(name): // global/images/xyz
		res := resolveImageGlobalImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/global/images/%s", providerProject, res[1]), nil
	case resolveImageGlobalFamily.MatchString(name): // global/images/family/xyz
		res := resolveImageGlobalFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/global/images/family/%s", providerProject, res[1]), nil
	}
	return "", fmt.Errorf("Could not expand image or family %q into a self_link", name)

}