package main

import (
	"errors"
	"log"
	"os"
	"strings"
)

var (
	BlogUrl               string
	GiteaEndpoint         string
	GiteaToken            string
	BunnyCdnKey           string
	IgnoredWebmentionUrls []string
)

func init() {
	// Blog URL (required)
	blogUrl, err := blogUrl()
	if err != nil {
		log.Fatal(err)
	}
	BlogUrl = blogUrl
	// Gitea (required)
	giteaEndpoint, err := giteaEndpoint()
	if err != nil {
		log.Fatal(err)
	}
	GiteaEndpoint = giteaEndpoint
	giteaToken, err := giteaToken()
	if err != nil {
		log.Fatal(err)
	}
	GiteaToken = giteaToken
	// BunnyCDN (optional)
	bunnyCdnKey, err := bunnyCdnKey()
	if err != nil {
		log.Println(err)
	}
	BunnyCdnKey = bunnyCdnKey
	// Ignored Webmention URLs (optional)
	ignoredWebmentionUrls, err := ignoredWebmentionUrls()
	if err != nil {
		log.Println(err)
	}
	IgnoredWebmentionUrls = ignoredWebmentionUrls
}

func giteaEndpoint() (string, error) {
	giteaEndpoint := os.Getenv("GITEA_ENDPOINT")
	if len(giteaEndpoint) == 0 || giteaEndpoint == "" {
		return "", errors.New("GITEA_ENDPOINT not specified")
	}
	return giteaEndpoint, nil
}

func giteaToken() (string, error) {
	giteaToken := os.Getenv("GITEA_TOKEN")
	if len(giteaToken) == 0 || giteaToken == "" {
		return "", errors.New("GITEA_TOKEN not specified")
	}
	return giteaToken, nil
}

func blogUrl() (string, error) {
	blogURL := os.Getenv("BLOG_URL")
	if len(blogURL) == 0 || blogURL == "" {
		return "", errors.New("BLOG_URL not specified")
	}
	return blogURL, nil
}

func bunnyCdnKey() (string, error) {
	bunnyCDNKey := os.Getenv("BUNNY_CDN_KEY")
	if len(bunnyCDNKey) == 0 || bunnyCDNKey == "" {
		return "", errors.New("BUNNY_CDN_KEY not specified, BunnyCDN features are deactivated")
	}
	return bunnyCDNKey, nil
}

func ignoredWebmentionUrls() ([]string, error) {
	webmentionIgnored := os.Getenv("WEBMENTION_IGNORED")
	if len(webmentionIgnored) == 0 {
		return nil, errors.New("WEBMENTION_IGNORED not set, no URLs are ignored on Webmention sending")
	}
	return strings.Split(webmentionIgnored, ","), nil
}