package main

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

var (
	BlogUrl               string
	GiteaEndpoint         string
	GiteaToken            string
	BunnyCdnKey           string
	MicroblogUrl          string
	MicroblogToken        string
	IgnoredWebmentionUrls []string
	SyndicationTargets    []SyndicationTarget
)

type SyndicationTarget struct {
	Uid  string `json:"uid"`
	Name string `json:"name"`
}

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
	// Microblog (optional)
	microblogUrl, err := microblogUrl()
	if err != nil {
		log.Println(err)
	}
	MicroblogUrl = microblogUrl
	microblogToken, err := microblogToken()
	if err != nil {
		log.Println(err)
	}
	MicroblogToken = microblogToken
	// Ignored Webmention URLs (optional)
	ignoredWebmentionUrls, err := ignoredWebmentionUrls()
	if err != nil {
		log.Println(err)
	}
	IgnoredWebmentionUrls = ignoredWebmentionUrls
	// Syndication Targets (optional)
	syndicationTargets, err := syndicationTargets()
	if err != nil {
		log.Println(err)
	}
	SyndicationTargets = syndicationTargets
}

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 microblogUrl() (string, error) {
	microblogUrl := os.Getenv("MICROBLOG_URL")
	if len(microblogUrl) == 0 || microblogUrl == "" {
		return "", errors.New("MICROBLOG_URL not specified, microblog.pub features are deactivated")
	}
	return microblogUrl, nil
}

func microblogToken() (string, error) {
	microblogToken := os.Getenv("MICROBLOG_TOKEN")
	if len(microblogToken) == 0 || microblogToken == "" {
		return "", errors.New("MICROBLOG_TOKEN not specified, microblog.pub features are deactivated")
	}
	return microblogToken, nil
}

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

func syndicationTargets() ([]SyndicationTarget, error) {
	syndication := os.Getenv("SYNDICATION")
	targets := make([]SyndicationTarget, 0)
	if len(syndication) == 0 {
		return targets, errors.New("SYNDICATION not set, no targets are returned when querying for syndication targets")
	}
	for _, url := range strings.Split(syndication, ",") {
		targets = append(targets, SyndicationTarget{
			Uid:  url,
			Name: url,
		})
	}
	return targets, nil
}