package repository

import (
	"fmt"
	"regexp"
	"strings"
)

/*
* Helm repo kinds: default/oci
 */
const (
	HELM_REPO_OCI     = "oci"
	HELM_REPO_DEFAULT = "default"
)

type Repository struct {
	Name string
	URL  string
	Kind string `yaml:"-"`
}

type Repositories []*Repository

// ValidateURL returns error if the repo URL doens't follow the format
func (r *Repository) ValidateURL() error {
	// An regex that should check if a string is a valid repo URL
	const urlRegex = "^(http|https|oci):\\/\\/.*"

	valid, err := regexp.MatchString(urlRegex, r.URL)
	if err != nil {
		return nil
	}
	if !valid {
		return fmt.Errorf("it's not a valid repo URL: %s", r.URL)
	}

	return nil
}

// KindFromUrl sets Repository.Kind according to the prefix of an URL
func (r *Repository) KindFromUrl() error {
	// It panics if URL is not valid,
	// but invalid url should not pass the ValidateURL function
	if err := r.ValidateURL(); err != nil {
		return err
	}

	prefix := r.URL[:strings.IndexByte(r.URL, ':')]
	switch prefix {
	case "oci":
		r.Kind = HELM_REPO_OCI
	case "https", "http":
		r.Kind = HELM_REPO_DEFAULT
	default:
		return fmt.Errorf("unknown repo kind: %s", prefix)
	}
	return nil
}

func (rs Repositories) NameByUrl(repoURL string) (string, error) {
	for _, r := range rs {
		if repoURL == r.URL {
			return r.Name, nil
		}
	}
	return "", fmt.Errorf("repo couldn't be found in the config: %s", repoURL)
}