added ability to update simkl episode count

SimklFunctions.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -37,3 +38,78 @@ func (a *App) SimklGetUserWatchlist() SimklWatchList {
 
 	return watchlist
 }
+
+func SimklPostHelper(url string, body interface{}) json.RawMessage {
+	reader, _ := json.Marshal(body)
+
+	client := &http.Client{}
+
+	req, _ := http.NewRequest("POST", url, bytes.NewBuffer(reader))
+
+	req.Header.Add("Content-Type", "application/json")
+	req.Header.Add("Authorization", "Bearer "+simklJwt.AccessToken)
+	req.Header.Add("simkl-api-key", os.Getenv("SIMKL_CLIENT_ID"))
+
+	resp, err := client.Do(req)
+
+	if err != nil {
+		fmt.Println("Errored when sending request to the server")
+		message, _ := json.Marshal(struct {
+			Message string `json:"message" ts_type:"message"`
+		}{
+			Message: "Errored when sending request to the server" + err.Error(),
+		})
+
+		return message
+	}
+
+	defer resp.Body.Close()
+	respBody, _ := io.ReadAll(resp.Body)
+
+	return respBody
+
+}
+
+func (a *App) SimklSyncEpisodes(anime Anime, progress int) interface{} {
+
+	var episodes []Episode
+	var url string
+	var shows []SimklPostShow
+
+	if progress >= anime.WatchedEpisodesCount {
+		for i := 1; i <= progress; i++ {
+			episodes = append(episodes, Episode{Number: i})
+		}
+		url = "https://api.simkl.com/sync/history"
+	} else {
+		for i := anime.WatchedEpisodesCount; i > progress; i-- {
+			episodes = append(episodes, Episode{Number: i})
+		}
+		url = "https://api.simkl.com/sync/history/remove"
+	}
+
+	formattedShow := SimklPostShow{
+		Title: anime.Show.Title,
+		Ids: Ids{
+			Simkl:   anime.Show.Ids.Simkl,
+			Mal:     anime.Show.Ids.Mal,
+			Anilist: anime.Show.Ids.AniList,
+		},
+		Episodes: episodes,
+	}
+
+	shows = append(shows, formattedShow)
+
+	simklSync := SimklSyncHistoryType{shows}
+
+	respBody := SimklPostHelper(url, simklSync)
+
+	var success interface{}
+
+	err := json.Unmarshal(respBody, &success)
+	if err != nil {
+		log.Printf("Failed at unmarshal, %s\n", err)
+	}
+
+	return success
+}