package routes

import (
	"net/http"
	"fmt"
	"encoding/json"
	"errors"
	"os"

	"extrovert/layouts"
	"extrovert/internals"
	"log"
)

type MastodonTokenResponse struct {
	Type    string `json:"token_type"`
	Token   string `json:"access_token"`
	Expires int    `json:"expires_in"`
	Scope   string `json:"scope"`
}

func MastodonLoginHandler(w http.ResponseWriter, r *http.Request) {
	error := internals.HttpErrorHelper(w)

	code := r.URL.Query().Get("code")
	if code == "" {
		error(
			"Bad request",
			errors.New("Missing \"code\" parameter"),
			http.StatusBadRequest,
		)
		return
	}

	tReq := fmt.Sprintf("https://api.twitter.com/2/oauth2/token"+
		"?grant_type=authorization_code"+
		"&client_id=%s"+
		"&code_verifier=challenge"+
		"&code=%s"+
		"&challenge_method=plain"+
		"&redirect_uri=http://localhost:7331/api/oauth/twitter",
		os.Getenv("TWITTER_CLIENT_ID"),
		code,
	)

	t, err := http.Post(tReq, "application/x-www-form-urlencoded", bytes.NewReader([]byte("")))
	if error("Error trying to request token from twitter", err, http.StatusInternalServerError) {
		return
	}

	b, err := io.ReadAll(t.Body)
	if error("Error trying to read response body from twitter", err, http.StatusInternalServerError) {
		return
	} else if t.StatusCode < 200 || t.StatusCode > 299 {
		error(
			"Error trying to request token from twitter, returned non-200 code",
			errors.New(fmt.Sprintf("Code: %v, Return value: %s", t.StatusCode, string(b))),
			http.StatusInternalServerError,
		)
		return
	}

	var res TwitterTokenResponse
	err = json.Unmarshal(b, &res)
	if error("Error trying to parse response body from twitter", err, http.StatusInternalServerError) {
		return
	}

	log.Print(res)

	c := internals.GetCookie("twitter-data", w, r)
	c.Value = res.Token
	http.SetCookie(w, c)

	MastodonLogin().Render(context.Background(), w)
}

templ MastodonLogin() {
	@layouts.Page("Project Extrovert") {
		<dialog open>
			<article>
				<header>
					<p>Logged into Twitter!</p>
				</header>
				<p>
					Your account was succefully connected with project-extrovert!
					Click "Ok" to return to the index page.
				</p>
				<footer>
					<a href="/index.html">
						<button>Ok</button>
					</a>
				</footer>
			</article>
		</dialog>
		@IndexPage()
	}
}