package main

import (
	"errors"
	"github.com/caarlos0/env/v6"
	"log"
	"strings"
)

var (
	BlogUrl                      string
	MediaEndpointUrl             string
	IgnoredWebmentionUrls        []string
	SyndicationTargets           []SyndicationTarget
	SelectedStorage              Storage
	SelectedMediaStorage         MediaStorage
	SelectedCdn                  Cdn
	SelectedSocials              Socials
	SelectedNotificationServices NotificationServices
	SelectedImageCompression     ImageCompression
)

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

type config struct {
	BlogUrl               string   `env:"BLOG_URL,required"`
	BaseUrl               string   `env:"BASE_URL,required"`
	MediaUrl              string   `env:"MEDIA_URL"`
	GiteaEndpoint         string   `env:"GITEA_ENDPOINT"`
	GiteaToken            string   `env:"GITEA_TOKEN"`
	BunnyCdnKey           string   `env:"BUNNY_CDN_KEY"`
	BunnyCdnStorageKey    string   `env:"BUNNY_CDN_STORAGE_KEY"`
	BunnyCdnStorageName   string   `env:"BUNNY_CDN_STORAGE_NAME"`
	MicroblogUrl          string   `env:"MICROBLOG_URL"`
	MicroblogToken        string   `env:"MICROBLOG_TOKEN"`
	TelegramUserId        int64    `env:"TELEGRAM_USER_ID"`
	TelegramBotToken      string   `env:"TELEGRAM_BOT_TOKEN"`
	IgnoredWebmentionUrls []string `env:"WEBMENTION_IGNORED" envSeparator:","`
	SyndicationTargets    []string `env:"SYNDICATION" envSeparator:","`
	TinifyKey             string   `env:"TINIFY_KEY"`
}

func initConfig() (err error) {
	cfg := config{}
	if err := env.Parse(&cfg); err != nil {
		return errors.New("failed to parse config, probably not all required env vars set")
	}
	// Blog URL (required)
	if !strings.HasSuffix(cfg.BlogUrl, "/") {
		return errors.New("missing trailing slash in BLOG_URL")
	}
	BlogUrl = cfg.BlogUrl
	// Media endpoint
	if !strings.HasSuffix(cfg.BaseUrl, "/") {
		return errors.New("missing trailing slash in BASE_URL")
	}
	MediaEndpointUrl = cfg.BaseUrl + "media"
	// Ignored Webmention URLs (optional)
	IgnoredWebmentionUrls = cfg.IgnoredWebmentionUrls
	// Syndication Targets (optional)
	targets := make([]SyndicationTarget, 0)
	for _, url := range cfg.SyndicationTargets {
		targets = append(targets, SyndicationTarget{
			Uid:  url,
			Name: url,
		})
	}
	SyndicationTargets = targets
	// Find selected storage
	SelectedStorage = func() Storage {
		// Gitea
		if len(cfg.GiteaEndpoint) > 0 && len(cfg.GiteaToken) >= 0 {
			return &Gitea{
				endpoint: cfg.GiteaEndpoint,
				token:    cfg.GiteaToken,
			}
		}
		return nil
	}()
	if SelectedStorage == nil {
		return errors.New("no storage configured")
	}
	// Find selected media storage (Optional)
	SelectedMediaStorage = func() MediaStorage {
		// BunnyCDN
		// MEDIA_URL needs trailing slash too
		if len(cfg.BunnyCdnStorageKey) > 0 && len(cfg.BunnyCdnStorageName) > 0 && len(cfg.MediaUrl) > 0 && strings.HasSuffix(cfg.MediaUrl, "/") {
			return &BunnyCdnStorage{
				key:             cfg.BunnyCdnStorageKey,
				storageZoneName: cfg.BunnyCdnStorageName,
				baseLocation:    cfg.MediaUrl,
			}
		}
		return nil
	}()
	if SelectedMediaStorage == nil {
		log.Println("no media storage configured")
	}
	// Find selected CDN (optional)
	SelectedCdn = func() Cdn {
		// BunnyCDN
		if len(cfg.BunnyCdnKey) > 0 {
			return &BunnyCdn{key: cfg.BunnyCdnKey}
		}
		return nil
	}()
	if SelectedCdn == nil {
		log.Println("no CDN configured")
	}
	// Find configured social networks (optional)
	SelectedSocials = func() Socials {
		var socials []Social = nil
		// Microblog.pub
		if len(cfg.MicroblogUrl) > 0 && len(cfg.MicroblogToken) > 0 {
			socials = append(socials, &MicroblogPub{
				url:   cfg.MicroblogUrl,
				token: cfg.MicroblogToken,
			})
		}
		return socials
	}()
	if SelectedSocials == nil {
		log.Println("no social networks configured")
	}
	// Find configured notification services (optional)
	SelectedNotificationServices = func() NotificationServices {
		var notificationServices []NotificationService = nil
		// Telegram
		if cfg.TelegramUserId > 0 && len(cfg.TelegramBotToken) > 0 {
			notificationServices = append(notificationServices, &Telegram{
				userId:   cfg.TelegramUserId,
				botToken: cfg.TelegramBotToken,
			})
		}
		return notificationServices
	}()
	if SelectedNotificationServices == nil {
		log.Println("No notification services configured")
	}
	// Find configured image compression service (optional)
	SelectedImageCompression = func() ImageCompression {
		// Tinify
		if len(cfg.TinifyKey) > 0 {
			return &Tinify{
				key: cfg.TinifyKey,
			}
		}
		return nil
	}()
	if SelectedImageCompression == nil {
		log.Println("no image compression configured")
	}
	return nil
}