package main

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"sync"

	"github.com/99designs/keyring"
	"github.com/wailsapp/wails/v2/pkg/runtime"
)

var aniListJwt AniListJWT

var aniRing, _ = keyring.Open(keyring.Config{
	ServiceName: "AniTrack",
})

var aniCtxShutdown, aniCancel = context.WithCancel(context.Background())

func (a *App) CheckIfAniListLoggedIn() bool {
	if (AniListJWT{} == aniListJwt) {
		tokenType, err := aniRing.Get("anilistTokenType")
		expiresIn, err := aniRing.Get("anilistTokenExpiresIn")
		accessToken, err := aniRing.Get("anilistAccessToken")
		refreshToken, err := aniRing.Get("anilistRefreshToken")
		if err != nil || len(accessToken.Data) == 0 {
			return false
		} else {
			aniListJwt.TokenType = string(tokenType.Data)
			aniListJwt.AccessToken = string(accessToken.Data)
			aniListJwt.RefreshToken = string(refreshToken.Data)
			aniListJwt.ExpiresIn, _ = strconv.Atoi(string(expiresIn.Data))
			return true
		}
	} else {
		return true
	}
}

func (a *App) AniListLogin() {
	if (AniListJWT{} == aniListJwt) {
		tokenType, err := aniRing.Get("anilistTokenType")
		expiresIn, err := aniRing.Get("anilistTokenExpiresIn")
		accessToken, err := aniRing.Get("anilistAccessToken")
		refreshToken, err := aniRing.Get("anilistRefreshToken")
		if err != nil || len(accessToken.Data) == 0 {
			getAniListCodeUrl := "https://anilist.co/api/v2/oauth/authorize?client_id=" + os.Getenv("ANILIST_APP_ID") + "&redirect_uri=" + os.Getenv("ANILIST_CALLBACK_URI") + "&response_type=code"
			runtime.BrowserOpenURL(a.ctx, getAniListCodeUrl)

			serverDone := &sync.WaitGroup{}
			serverDone.Add(1)
			handleAniListCallback(serverDone)
			serverDone.Wait()
		} else {
			aniListJwt.TokenType = string(tokenType.Data)
			aniListJwt.AccessToken = string(accessToken.Data)
			aniListJwt.RefreshToken = string(refreshToken.Data)
			aniListJwt.ExpiresIn, _ = strconv.Atoi(string(expiresIn.Data))
		}
	}
}

func handleAniListCallback(wg *sync.WaitGroup) {
	srv := &http.Server{Addr: ":6734"}
	http.HandleFunc("/callback", func(w http.ResponseWriter, r *http.Request) {
		select {
		case <-aniCtxShutdown.Done():
			fmt.Println("Shutting down...")
			return
		default:
		}
		content := r.FormValue("code")

		if content != "" {
			aniListJwt = getAniListAuthorizationToken(content)
			_ = aniRing.Set(keyring.Item{
				Key:  "anilistTokenType",
				Data: []byte(aniListJwt.TokenType),
			})
			_ = aniRing.Set(keyring.Item{
				Key:  "anilistTokenExpiresIn",
				Data: []byte(strconv.Itoa(aniListJwt.ExpiresIn)),
			})
			_ = aniRing.Set(keyring.Item{
				Key:  "anilistAccessToken",
				Data: []byte(aniListJwt.AccessToken),
			})
			_ = aniRing.Set(keyring.Item{
				Key:  "anilistRefreshToken",
				Data: []byte(aniListJwt.RefreshToken),
			})
			fmt.Println("Shutting down...")
			aniCancel()
			err := srv.Shutdown(context.Background())
			if err != nil {
				log.Println("server.Shutdown:", err)
			}
		} else {
			_, err := fmt.Fprintf(w, "Getting code failed.")
			if err != nil {
				return
			}
		}
	})

	go func() {
		defer wg.Done()
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
		fmt.Println("Shutting down...")
	}()
}

func getAniListAuthorizationToken(content string) AniListJWT {
	apiUrl := "https://anilist.co/api/v2/oauth/token"
	resource := "/api/v2/oauth/token"
	data := url.Values{}
	data.Set("grant_type", "authorization_code")
	data.Set("client_id", os.Getenv("ANILIST_APP_ID"))
	data.Set("client_secret", os.Getenv("ANILIST_SECRET_TOKEN"))
	data.Set("redirect_uri", os.Getenv("ANILIST_CALLBACK_URI"))
	data.Set("code", content)

	u, _ := url.ParseRequestURI(apiUrl)
	u.Path = resource
	urlStr := u.String()

	response, err := http.NewRequest("POST", urlStr, strings.NewReader(data.Encode()))
	if err != nil {
		log.Printf("Failed at response, %s\n", err)
	}
	response.Header.Add("content-type", "application/x-www-form-urlencoded")
	response.Header.Add("Content-Type", "application/json")
	response.Header.Add("Accept", "application/json")

	client := &http.Client{}
	res, reserr := client.Do(response)
	if reserr != nil {
		log.Printf("Failed at res, %s\n", err)
	}

	defer res.Body.Close()

	returnedBody, err := io.ReadAll(res.Body)

	var post AniListJWT
	err = json.Unmarshal(returnedBody, &post)
	if err != nil {
		log.Printf("Failed at unmarshal, %s\n", err)
	}

	return post
}

func (a *App) GetAniListLoggedInUser() AniListUser {
	a.AniListLogin()
	body := struct {
		Query string `json:"query"`
	}{
		Query: `
		query {
		  Viewer {
			id
			name
			avatar {
			  large
			  medium
			}
			bannerImage
			siteUrl
		  }
		}
	`,
	}

	user, _ := AniListQuery(body, true)

	var post AniListUser
	err := json.Unmarshal(user, &post)
	if err != nil {
		log.Printf("Failed at unmarshal, %s\n", err)
	}

	return post
}