import os

from flask import Flask, redirect, render_template, request

from shortener.exceptions import ApiException, ShortCodeNotFoundException
from shortener.handlers import handle_shorten
from shortener.resolver import resolver

app = Flask(__name__)


@app.route("/")
def home():
    return render_template("welcome.html")


@app.route("/shorten", methods=["POST"])
def shorten_url():
    try:
        result = handle_shorten()
        code = 200
    except ApiException as e:
        result = {"message": e.message, "status": "error"}
        code = e.code
    is_api = bool(request.json)
    if is_api:
        return result, code

    return render_template("result.html", **result), code


@app.route("/<string:shortcode>")
def expand_url(shortcode: str):
    try:
        redirect_url = resolver.resolve_shortcode(shortcode)
    except ShortCodeNotFoundException:
        return render_template("not_found.html")
    return redirect(redirect_url, code=302)


if __name__ == "__main__":
    port = int(os.environ.get("PORT", 5000))
    app.run(host="0.0.0.0", port=port)