from flask import Flask, jsonify, request, render_template, redirect
import json
import os

compiti = []
id_counter = 0

def update_file():
    with open('compiti.json', 'w') as f:
        json.dump(compiti, f)

if os.path.isfile('compiti.json'):
    with open('compiti.json', 'r') as f:
        compiti = json.load(f)
        id_counter = compiti[-1]["id"] + 1
else:
    compiti = [
    {"id": 1, "descrizione": "Compito matematica"},
    {"id": 2, "descrizione": "Consegna TPSIT progetto API REST"},
    {"id": 3, "descrizione": "Compito di sistemi"},
    {"id": 4, "descrizione": "Compito di italiano"}
    ]
    id_counter = 5
    update_file()



app = Flask(__name__)

@app.route("/", methods=["GET"])
def home():
    html = "<h1>Home page API REST Compiti</h1>"
    html += "<a href=\"/ui\">Apri interfaccia web</a><br><a href=\"/doc\">Documentazione</a>"
    return html, 200

@app.route("/doc", methods=["GET"])
def get_doc():
    return render_template("doc.html"), 200

@app.route("/compiti", methods=["GET"])
def get_compiti():
    return jsonify(compiti), 200

@app.route("/compiti/<int:id>", methods=["GET"])
def get_compito_by_id(id):
    for ciscomerda in compiti:
        if ciscomerda["id"] == id:
            return jsonify(ciscomerda), 200
    return jsonify([]), 404

@app.route("/compiti", methods=["POST"])
def create_compito():
    global id_counter
    j = request.get_json()
    j["id"] = id_counter
    id_counter += 1
    compiti.append(j)
    update_file()
    return jsonify(j), 201

@app.route("/compiti/<int:id>", methods=["DELETE"])
def delete_compito(id):
    for ciscomerda in compiti:
        if ciscomerda["id"] == id:
            compiti.remove(ciscomerda)
            update_file()
            return jsonify(ciscomerda), 200
    update_file()
    return jsonify([]), 404

@app.route("/ui")
def web_ui():
    # Tabella compiti
    html = "<table border>"
    for ciscomerda in compiti:
        html += "<tr>"
        html += f"<td>{ciscomerda["descrizione"]}</td><td><a href=\"/form_delete?id={ciscomerda["id"]}\" class=\"button\">Elimina</a>"
        html += "</tr>"
    html += "</table>"
    
    html += "<form action=\"/form_add\">"
    html += "<input type=\"text\" name=\"descrizione\" placeholder=\"Descrizione compito\">"
    html += "<input type=\"submit\" value=\"Aggiungi compito\">"
    html += "</form>"

    return html, 200

@app.route("/form_add")
def form_add():
    if not request.args.get("descrizione"):
        return "Errore: descrizione mancante", 400
    else:
        global id_counter
        d = request.args.get("descrizione")
        compiti.append({"id": id_counter, "descrizione": d})
        id_counter += 1
        update_file()
        return redirect("/ui")            

@app.route("/form_delete")
def form_delete():
    if not request.args.get("id"):
        return "Errore: id mancante", 400
    else:
        id = int(request.args.get("id"))
        for ciscomerda in compiti:
            if ciscomerda["id"] == id:
                compiti.remove(ciscomerda)
                update_file()
                return redirect("/ui")
        return "Errore: compito non trovato", 404

app.run("0.0.0.0")