package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
	"time"

	"github.com/gookit/color"
	"github.com/valyala/fasthttp"
)

func GetAnimeDetailData(animeId int64) (*Anime, []byte, error) {
	var anime Anime
	key := strconv.FormatInt(animeId, 10)
	data, err := animeCache.Get(key)
	if err != nil {
		dataMal, err := GetDataMal(animeApiMal + key + "?fields=id,title,main_picture,alternative_titles,start_date,end_date,synopsis,mean,rank,popularity,num_list_users,num_scoring_users,nsfw,media_type,status,genres,my_list_status,num_episodes,start_season,broadcast,source,average_episode_duration,rating,studios")
		if err != nil {
			return nil, nil, err
		}
		var animeMal AnimeDetailMal
		err = json.Unmarshal(dataMal, &animeMal)
		if err != nil {
			return nil, nil, err
		}
		// convert to anime
		anime = MalConvert(&animeMal)
		data, err = json.Marshal(&anime)
		if err != nil {
			return &anime, data, err
		}
		animeCache.Set(key, data)
	} else {
		err = json.Unmarshal(data, &anime)
	}
	return &anime, data, err
}

func GetUserAnimeListData(username, status string) (*AnimeListMal, []byte, error) {
	var list AnimeListMal
	body, err := GetUserAnimeListBytes(username, status)
	if err != nil {
		return nil, body, err
	}
	err = json.Unmarshal(body, &list)
	return &list, body, err
}

func GetUserAnimeListBytes(username, status string) ([]byte, error) {
	return GetDataMal(userApiMal + username + "/animelist?limit=1000&status=" + status)
}

func GetUserData(username string) (*UserJikan, []byte, error) {
	var user UserJikan
	body, err := GetUserBytesCached(username)
	if err != nil {
		return nil, body, err
	}
	err = json.Unmarshal(body, &user)
	return &user, body, err
}

func GetUserBytesCached(username string) ([]byte, error) {
	key := userApiJikan + username
	data, err := cache.Get(key)
	if err != nil {
		data, err = GetDataJikan(key)
		if err != nil {
			return data, err
		}
		if strings.Contains(string(data), "BadResponseException") {
			return data, fmt.Errorf("user not found: %s", username)
		}
		cache.Set(key, data)
		return data, err
	}
	return data, err
}

func GetSeasonDataAll() ([]Anime, []byte, error) {
	color.Infoln("Aktuelle Season abfragen...")
	data, _, err := GetSeasonData(1)
	if err != nil {
		return nil, nil, err
	}
	color.Infof("%d Anime auf %d Seiten\n", data.Pagination.Items.Total, data.Pagination.LastVisiblePage)
	animes := make([]Anime, 0)
	// convert to anime
	for _, a := range data.Data {
		animes = append(animes, JikanConvert(&a))
	}
	for i := 2; data.Pagination.HasNextPage; i++ {
		color.Infof("Seite %d abfragen...\n", i)
		time.Sleep(time.Second)
		newData, _, err := GetSeasonData(i)
		if err != nil {
			return nil, nil, err
		}
		data.Pagination.CurrentPage = newData.Pagination.CurrentPage
		data.Pagination.HasNextPage = newData.Pagination.HasNextPage
		data.Pagination.Items.Count += newData.Pagination.Items.Count
		// convert to anime
		for _, a := range newData.Data {
			animes = append(animes, JikanConvert(&a))
		}
	}
	color.Infof("%d Anime bekommen\n", len(animes))
	bytes, err := json.Marshal(animes)
	return animes, bytes, err
}

func GetSeasonData(page int) (*SeasonJikan, []byte, error) {
	var data SeasonJikan
	body, err := GetSeasonBytes(page)
	if err != nil {
		return nil, body, err
	}
	err = json.Unmarshal(body, &data)
	return &data, body, err
}

func GetSeasonBytes(page int) ([]byte, error) {
	if page != 0 {
		return GetDataJikan(seasonApiJikan + "?page=" + strconv.Itoa(page))
	}
	return GetDataJikan(seasonApiJikan)
}

func GetDataMal(apiAddr string) ([]byte, error) {
	var body []byte
	req := fasthttp.AcquireRequest()
	resp := fasthttp.AcquireResponse()
	defer fasthttp.ReleaseRequest(req)
	defer fasthttp.ReleaseResponse(resp)

	req.SetRequestURI(*malApiBaseUri + apiAddr)
	req.Header.SetMethod(fasthttp.MethodGet)
	req.Header.Add("X-MAL-CLIENT-ID", *malApiId)
	err := fasthttp.Do(req, resp)
	contentEncoding := resp.Header.Peek(fasthttp.HeaderContentEncoding)
	if bytes.EqualFold(contentEncoding, []byte("gzip")) {
		body, _ = resp.BodyGunzip()
	} else {
		body = resp.Body()
	}

	if resp.StatusCode() != fasthttp.StatusOK {
		return body, fmt.Errorf("unexpected response code: %s %d", *malApiBaseUri+apiAddr, resp.StatusCode())
	}
	return body, err
}

func GetDataJikan(apiAddr string) ([]byte, error) {
	var body []byte
	statusCode, body, err := fasthttp.Get(body, *jikanApiBaseUri+apiAddr)
	if statusCode != fasthttp.StatusOK {
		return body, fmt.Errorf("unexpected response code: %s %d", *jikanApiBaseUri+apiAddr, statusCode)
	}
	return body, err
}

func GetCurrentSeasonString() string {
	var now = time.Now()
	switch now.Month() {
	case time.January, time.February, time.March:
		return fmt.Sprintf("%04d/winter", now.Year())
	case time.April, time.May, time.June:
		return fmt.Sprintf("%04d/spring", now.Year())
	case time.July, time.August, time.September:
		return fmt.Sprintf("%04d/summer", now.Year())
	case time.October, time.November, time.December:
		return fmt.Sprintf("%04d/fall", now.Year())
	default:
		return fmt.Sprintf("%04d", now.Year())
	}
}