package main

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"strconv"
	"strings"
)

func MALHelper(method string, malUrl string, body url.Values) (json.RawMessage, string, error) {
	client := &http.Client{}

	req, err := http.NewRequest(method, malUrl, strings.NewReader(body.Encode()))

	if err != nil {
		message, _ := json.Marshal(struct {
			Message string `json:"message"`
		}{
			Message: "Failed to create request: " + err.Error(),
		})
		return message, "", fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	req.Header.Add("Authorization", "Bearer "+myAnimeListJwt.AccessToken)

	resp, err := client.Do(req)

	if err != nil {
		message, _ := json.Marshal(struct {
			Message string `json:"message"`
		}{
			Message: "Network error: " + err.Error(),
		})
		return message, "", fmt.Errorf("network error: %w", err)
	}

	defer resp.Body.Close()
	respBody, err := io.ReadAll(resp.Body)

	if err != nil {
		return nil, resp.Status, fmt.Errorf("failed to read response: %w", err)
	}

	if resp.Status == "401 Unauthorized" {
		refreshMyAnimeListAuthorizationToken()
		return MALHelper(method, malUrl, body)
	}

	if resp.Status != "200 OK" && resp.Status != "201 Created" && resp.Status != "202 Accepted" {
		return respBody, resp.Status, fmt.Errorf("API returned status: %s", resp.Status)
	}
	return respBody, resp.Status, nil
}

func (a *App) GetMyAnimeList(count int) (MALWatchlist, error) {
	limit := strconv.Itoa(count)
	user := a.GetMyAnimeListLoggedInUser()
	malUrl := "https://api.myanimelist.net/v2/users/" + user.Name + "/animelist?fields=list_status&status=watching&limit=" + limit

	var malList MALWatchlist

	respBody, resStatus, err := MALHelper("GET", malUrl, nil)

	if err != nil {
		return malList, fmt.Errorf("failed to get MAL watchlist: %w", err)
	}

	if resStatus == "200 OK" {
		err := json.Unmarshal(respBody, &malList)
		if err != nil {
			log.Printf("Failed to unmarshal json response, %s\n", err)
			return malList, fmt.Errorf("failed to parse response: %w", err)
		}
	}

	return malList, nil
}

func (a *App) MyAnimeListUpdate(anime MALAnime, update MALUploadStatus) (MalListStatus, error) {
	if update.NumTimesRewatched >= 1 {
		update.IsRewatching = true
	} else {
		update.IsRewatching = false
	}
	body := url.Values{}
	body.Set("status", update.Status)
	body.Set("is_rewatching", strconv.FormatBool(update.IsRewatching))
	body.Set("score", strconv.Itoa(update.Score))
	body.Set("num_watched_episodes", strconv.Itoa(update.NumWatchedEpisodes))
	body.Set("num_times_rewatched", strconv.Itoa(update.NumTimesRewatched))
	body.Set("comments", update.Comments)

	malUrl := "https://api.myanimelist.net/v2/anime/" + strconv.Itoa(anime.Id) + "/my_list_status"
	var status MalListStatus
	respBody, respStatus, err := MALHelper("PATCH", malUrl, body)

	if err != nil {
		return status, fmt.Errorf("failed to update MAL entry: %w", err)
	}

	if respStatus == "200 OK" {
		err := json.Unmarshal(respBody, &status)
		if err != nil {
			log.Printf("Failed to unmarshal json response, %s\n", err)
			return status, fmt.Errorf("failed to parse response: %w", err)
		}
	}
	return status, nil
}

func (a *App) GetMyAnimeListAnime(id int) (MALAnime, error) {
	malUrl := "https://api.myanimelist.net/v2/anime/" + strconv.Itoa(id) + "?fields=id,title,main_picture,alternative_titles,start_date,end_date,synopsis,mean,rank,popularity,num_list_users,num_scoring_users,nsfw,genres,created_at,updated_at,media_type,status,my_list_status,num_episodes,start_season,broadcast,source,average_episode_duration,rating,pictures,background,related_anime,recommendations,studios,statistics"
	var malAnime MALAnime
	respBody, respStatus, err := MALHelper("GET", malUrl, nil)

	if err != nil {
		return malAnime, fmt.Errorf("failed to get MAL anime: %w", err)
	}

	if respStatus == "200 OK" {
		err := json.Unmarshal(respBody, &malAnime)
		if err != nil {
			log.Printf("Failed to unmarshal json response, %s\n", err)
			return malAnime, fmt.Errorf("failed to parse response: %w", err)
		}
	}
	return malAnime, nil
}

func (a *App) DeleteMyAnimeListEntry(id int) (bool, error) {
	malUrl := "https://api.myanimelist.net/v2/anime/" + strconv.Itoa(id) + "/my_list_status"
	_, respStatus, err := MALHelper("DELETE", malUrl, nil)

	if err != nil {
		return false, fmt.Errorf("failed to delete MAL entry: %w", err)
	}

	if respStatus == "200 OK" {
		return true, nil
	} else {
		return false, fmt.Errorf("delete failed with status: %s", respStatus)
	}
}