package main

import (
	"bytes"
	"encoding/json"
	"net/http"
	"time"
)

const (
	wikiURL   = "https://wiki.example.com/graphql"
	token     = "WIKIJS_API_TOKEN"
	webhook   = "https://discord.com/api/webhooks/XXXX/XXXX"
	interval  = 5 * time.Minute
)

var lastUpdate string

func check() {
	q := `{"query":"{ pages { list(orderBy: UPDATED_AT, orderDirection: DESC, limit: 1){ updatedAt title }}}"}`
	req, _ := http.NewRequest("POST", wikiURL, bytes.NewBuffer([]byte(q)))
	req.Header.Set("Authorization", "Bearer "+token)
	req.Header.Set("Content-Type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return
	}
	defer res.Body.Close()

	var r struct {
		Data struct {
			Pages struct {
				List []struct {
					UpdatedAt string
					Title     string
				}
			}
		}
	}
	json.NewDecoder(res.Body).Decode(&r)

	if len(r.Data.Pages.List) == 0 {
		return
	}

	u := r.Data.Pages.List[0]
	if u.UpdatedAt != lastUpdate {
		lastUpdate = u.UpdatedAt
		msg, _ := json.Marshal(map[string]string{
			"content": "Wiki frissítve: " + u.Title,
		})
		http.Post(webhook, "application/json", bytes.NewBuffer(msg))
	}
}

func main() {
	for {
		check()
		time.Sleep(interval)
	}
}