import hashlib, os
import time
from flask import Flask, redirect, render_template, request
import sqlite3
import re

app = Flask(__name__)
db = sqlite3.connect('guestbook.db', check_same_thread=False)
cs = db.cursor()
app.secret_key = hashlib.md5(os.urandom(32)).hexdigest()

@app.template_filter('parsetime')
def parsetime(value):
    return time.strftime('%Y-%m-%d %H:%M', time.localtime(value))
    
@app.route('/')
def index():
    statement = 'SELECT "id", "name", "website", "comment", "date", "ip" FROM "entries" ORDER BY id DESC'
    cs.execute(statement)
    return render_template("index.html", comments=cs.fetchall())

@app.route('/submit', methods=["POST"])
def submit():
    errors = []
    name = request.form.get("name")
    website = request.form.get("website")
    comment = request.form.get("comment")
    if name != "":
        if name.isalnum() != True:
            errors.append("Your name must not contain any non-alphanumeric characters")
    else:
        name = "Anonymous"
    if website !="":
        if not re.fullmatch(r"^[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)*\.[a-zA-Z]{2,3}(\.[a-zA-Z]{2,3})?$", website):
            errors.append("Your site doesn't look valid.")
    if comment == "":
        errors.append("You must write something.")
    elif len(comment) > 512:
        errors.append("You wrote more than 512 characters")
    if errors != []:
        response = ""
        for error in errors:
            response += f"{error}<br>"
        return response
    statement = 'INSERT INTO "entries" ("name", "website", "comment", "date", "ip") VALUES (?, ?, ?, ?, ?);'
    values = (name, website, comment, int(time.time()), str(request.remote_addr))
    cs.execute(statement, values)
    db.commit()
    #change this if you run it on anything other than /gb
    return redirect("/gb")