#!/usr/bin/python3
import os
import configparser
import sqlite3
import time
import json
import secrets
import datetime
import socket
import threading
import subprocess
import asyncio
from hypercorn.config import Config
from hypercorn.asyncio import serve
from itertools import groupby
from werkzeug.utils import secure_filename
from werkzeug.security import generate_password_hash, check_password_hash
from quart import Quart, render_template, request, url_for, flash, redirect, session, make_response, send_from_directory, stream_with_context, Response, request, jsonify, websocket
from apscheduler.schedulers.background import BackgroundScheduler

# read config file
config = configparser.ConfigParser()
config.read("config.ini")

PORT = config["config"]["PORT"]
SECRET_KEY = config["config"]["SECRET_KEY"]
UPLOAD_FOLDER = config["config"]["UPLOAD_FOLDER"]
UPLOAD_LIMIT = config["config"]["UPLOAD_LIMIT"]
PASSWORD_REQUIREMENT = config["config"]["PASSWORD_REQUIREMENT"]

app = Quart(__name__)
app.config["SECRET_KEY"] = SECRET_KEY
app.config["MAX_CONTENT_LENGTH"] = int(UPLOAD_LIMIT) * 1000 * 1000

if SECRET_KEY == "placeholder":
    print("[WARNING] Secret key is not set")

if not os.path.exists(UPLOAD_FOLDER):
    print("[WARNING] Upload folder doesn't exist, creating")
    os.mkdir(UPLOAD_FOLDER)

if not os.path.exists("database.db"):
    print("[ERROR] No database exists, please run init_db")
    exit()


def makeStrSafe(url):
    return str(urllib.parse.quote(url)).replace("%20", " ")


def get_db_connection():
    conn = sqlite3.connect("database.db")
    conn.row_factory = sqlite3.Row
    return conn


def get_user(id):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM users WHERE id = ?",
                        (id,)).fetchone()
    conn.close()
    if post is None:
        return "error"
    return post


def get_comments(id):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM comments WHERE post_id = ?",
                        (id,)).fetchall()
    conn.close()
    if post is None:
        return "error"
    return post


def get_messages(chatroomid, max):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM chatmessages WHERE chatroom_id = ? ORDER BY created DESC;",
                        (chatroomid,)).fetchmany(max + 1)
    conn.close()
    if post is None:
        return "error"
    return post


app.jinja_env.globals.update(getComments=get_comments)

def get_post(id):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM posts WHERE id = ?",
                        (id,)).fetchone()
    conn.close()
    if post is None:
        return "error"
    return post


app.jinja_env.globals.update(getUser=get_user)


def check_username_taken(username):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM users WHERE lower(username) = ?",
                        (username.lower(),)).fetchone()
    conn.close()
    if post is None:
        return "error"
    return post["id"]


def get_session(id):
    conn = get_db_connection()
    post = conn.execute("SELECT * FROM sessions WHERE session = ?",
                        (id,)).fetchone()
    conn.close()
    if post is None:
        return "error"
    return post

full_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode().strip()
short_hash = subprocess.check_output(["git", "rev-parse", "--short=8", "HEAD"]).decode().strip()

ALLOWED_EXTENSIONS = {"png", "apng", "jpg", "jpeg", "gif", "svg", "webp", "jxl"}

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route("/", methods=("GET", "POST"))
async def main():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    conn = get_db_connection()
    posts = conn.execute("SELECT * FROM posts ORDER BY created DESC;").fetchall()
    conn.close()

    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])
        return await render_template("main.html", userdata=user, posts=posts, full_hash=full_hash, short_hash=short_hash)
    else:
        return await render_template("main.html", posts=posts, full_hash=full_hash, short_hash=short_hash)

@app.route("/chat", methods=("GET", "POST"))
async def chat():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])
        return await render_template("chat.html", userdata=user)
    else:
        return await render_template("chat.html")

@app.route("/api/chat/listrooms")
async def chatlistrooms():
    conn = get_db_connection()
    rooms = conn.execute("SELECT * FROM chatrooms ORDER BY id ASC;").fetchall()
    conn.close()

    template = []

    for room in rooms:
        roomtemplate = {
            "id": room["id"],
            "name": room["roomname"]
        }
        template.append(roomtemplate)
    
    return(template), 200

@app.route("/api/chat/getmessages/<roomid>")
async def chatget(roomid):
    messages = get_messages(roomid, 150)

    template = []

    for message in messages:
        creatorid = message["creator"]

        creatortemplate = {
            "id": message["creator"],
            "username": get_user(creatorid)["username"]
        }

        messagetemplate = {
            "id": message["id"],
            "content": message["content"],
            "creator": creatortemplate,
            "created": message["created"]
        }
        template.append(messagetemplate)
    
    return(template), 200


@app.route("/api/chat/send/<roomid>", methods=("GET", "POST"))
async def chatsend(roomid):
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        if request.method == "POST":

            data = await request.get_json()
            content = data["content"]

            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])

            if not user["banned"] == "0":
                return {
                    "error": "banned"
                }, 403

            chatMessageContent = {
                "content": content,
                "creator": user["username"],
                "roomid": roomid,
                "created": str(time.time())
            }

            #message_queue.append({"message": chatMessageContent})

            conn = get_db_connection()
            conn.execute("INSERT INTO chatmessages (content, chatroom_id, creator, created) VALUES (?, ?, ?, ?)",
                         (content, roomid, userCookie["id"], str(time.time())))
            conn.commit()
            conn.close()

            return "success", 200


@app.route("/@<pageusername>", methods=("GET", "POST"))
async def user(pageusername):
    usersession = request.cookies.get("session_DO_NOT_SHARE")

    checkusername = check_username_taken(pageusername)

    if not checkusername == "error":
        pageuser = get_user(checkusername)
        if usersession:
            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])
            return await render_template("user.html", userdata=user, createddate=datetime.datetime.utcfromtimestamp(int(str(pageuser["created"]).split(".")[0])).strftime("%Y-%m-%d"), pageuser=pageuser)
        else:
            return await render_template("user.html", createddate=datetime.datetime.utcfromtimestamp(int(str(pageuser["created"]).split(".")[0])).strftime("%Y-%m-%d"), pageuser=pageuser)
    else:
        return """<img src="https://http.cat/images/404.jpg">""", 404

@app.route("/api/page/<userid>", methods=("GET", "POST"))
async def apipageuser(userid):
    pageuser = get_user(userid)
    addhtml = """
    <!DOCTYPE html><script>
    window.stop()
    </script>
    <base target="_blank"/> <head><meta http-equiv="Content-Security-Policy" default-src='none'; child-src='none'; content="img-src cdn.discordapp.com cdn.discordapp.net media.tenor.com; media-src: fonts.gstatic.com fonts.googleapis.com;" /></head>"""

    if not pageuser == "error":
        return addhtml + pageuser["htmldescription"]
    else:
        return """<img src="https://http.cat/images/404.jpg">""", 404

@app.route("/@<pageusername>/edit", methods=("GET", "POST"))
async def edituser(pageusername):
    usersession = request.cookies.get("session_DO_NOT_SHARE")

    checkusername = check_username_taken(pageusername)

    if not checkusername == "error":
        pageuser = get_user(checkusername)
        if usersession:
            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])
            if pageuser["username"] == user["username"]:
                if request.method == "POST":
                    requestData = await request.form

                    code = requestData["code"].replace("Content-Security-Policy", "").replace("<iframe>", "")
                    conn = get_db_connection()
                    conn.execute("UPDATE users SET htmldescription = ? WHERE id = ?",
                        (code, user["id"]))
                    conn.commit()
                    conn.close()
                    return redirect("/@" + user["username"])
                else:
                    return await render_template("edituser.html", userdata=user, pageuser=pageuser)
            else:
                return """<img src="https://http.cat/images/403.jpg">""", 403
        else:
            return """<img src="https://http.cat/images/403.jpg">""", 403
    else:
        return """<img src="https://http.cat/images/404.jpg">""", 404


@app.route("/api/frontpage", methods=("GET", "POST"))
async def apifrontpage():
    conn = get_db_connection()
    posts = conn.execute("SELECT * FROM posts ORDER BY created DESC;").fetchall()
    conn.close()

    result = []

    for post in posts:
        comments = []

        for comment in get_comments(post["id"]):
            commentthing = {
                "title": comment["textstr"],
                "id": comment["id"],
                "created": comment["created"],
                "creator": {
                    "id": comment["creator"],
                    "username": get_user(comment["creator"])["username"]
                }
            }
            comments.append(commentthing)


        mainthing = {
            "id": post["id"],
            "created": post["created"],
            "title": post["textstr"],
            "imgurl": post["imageurl"],
            "creator": {
                "id": post["creator"],
                "username": get_user(post["creator"])["username"]
            },
            "comments": comments
        }
        
        result.append(mainthing)

    return result

@app.route("/api/userinfo", methods=("GET", "POST"))
async def apiuserinfo():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])
        datatemplate = {
            "username": user["username"],
            "id": user["id"],
            "created": user["created"]
        }
        return datatemplate
    else:
        return {
                    "error": "no authentication"
                }, 403


@app.route("/api/login", methods=("GET", "POST"))
async def apilogin():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if request.method == "POST":
        data = await request.get_json()
        username = data["username"]
        password = data["password"]

        userID = check_username_taken(username)
        user = get_user(userID)

        if user == "error":
            return {
                    "error": "wrong username or password"
                }, 401

        if not check_password_hash(user["password"], (password)):
            return {
                    "error": "wrong username or password"
                }, 401

        randomCharacters = secrets.token_hex(512)

        conn = get_db_connection()
        conn.execute("INSERT INTO sessions (session, id) VALUES (?, ?)",
                     (randomCharacters, userID))
        conn.commit()
        conn.close()

        return {
                    "key": randomCharacters
                }, 200
    else:
        return {
            "error": "https://http.cat/images/400.jpg"
        }, 400

@app.route("/apidocs", methods=("GET", "POST"))
async def apidocs():
    usersession = request.cookies.get("session_DO_NOT_SHARE")

    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])
        return await render_template("apidocs.html", userdata=user)
    else:
        return await render_template("apidocs.html")

@app.route("/post", methods=("GET", "POST"))
async def post():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        if request.method == "POST":
            formData = await request.form
            formFiles = await request.files

            title = formData["title"]
            if title == "":
                await flash("Text required :3")
                return redirect(url_for("post"))

            if len(title) > 300:
                await flash("Too long title!")
                return redirect(url_for("post"))

            file = formFiles["file"]

            if (file):
                if not allowed_file(file.filename):
                    await flash("File is not an image!")
                    return redirect(url_for("post"))

            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])

            if not user["banned"] == "0":
                await flash("Your account has been suspended. You may no longer post")
                return redirect(url_for("post"))

            filename = secure_filename(file.filename)
            finalfilename = secrets.token_hex(32) + filename

            await file.save(os.path.join(UPLOAD_FOLDER, finalfilename))
            imgurl = "/cdn/" + finalfilename

            if (not file):
                imgurl = ""

            conn = get_db_connection()
            conn.execute("INSERT INTO posts (textstr, imageurl, creator, created) VALUES (?, ?, ?, ?)",
                         (title, imgurl, userCookie["id"], str(time.time())))
            conn.commit()
            conn.close()
            return redirect(url_for("main"))

        else:
            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])
            return await render_template("post.html", userdata=user)
    else:
        await flash("A burgercat account is required to post :3")
        return redirect(url_for("login"))


@app.route("/api/comment", methods=("GET", "POST"))
async def comment():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        if request.method == "POST":

            data = await request.get_json()
            uid = data["id"]
            title = data["title"]
            
            userCookie = get_session(usersession)
            user = get_user(userCookie["id"])

            if len(title) > 300:
                return {
                    "error": "too much text"
                }, 403

            if not user["banned"] == "0":
                return {
                    "error": "banned"
                }, 403

            conn = get_db_connection()
            conn.execute("INSERT INTO comments (textstr, post_id, creator, created) VALUES (?, ?, ?, ?)",
                         (title, uid, userCookie["id"], str(time.time())))
            conn.commit()
            conn.close()

            return "success", 200

        else:
            return {
                    "error": "https://http.cat/images/400.jpg"
                }, 400
    else:
        return {
                    "error": "https://http.cat/images/401.jpg"
                }, 401

@app.route("/api/post/<post_id>/comments", methods=("GET", "POST"))
async def apicomments(post_id):
    postthing = get_comments(int(post_id))

    if not postthing == "error":
        comments = []
        for comment in postthing:
            commentthing = {
                "title": comment["textstr"],
                "created": comment["created"],
                "creator": {
                    "id": comment["creator"],
                    "username": get_user(comment["creator"])["username"]
                }
            }
            comments.append(commentthing)
        return comments

@app.route("/cdn/<filename>", methods=("GET", "POST"))
async def cdn(filename):
    if os.path.exists(os.path.join(UPLOAD_FOLDER, filename)):
        return await send_from_directory(UPLOAD_FOLDER, filename)
    else:
        return "file doesn't exist!!"


@app.route("/signup", methods=("GET", "POST"))
async def signup():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        return redirect(url_for("main"))
    if request.method == "POST":
        requestData = await request.form

        if not check_username_taken(requestData["username"]) == "error":
            await flash("Username already taken :3")
            return redirect(url_for("signup"))

        if not requestData["username"].isalnum():
            await flash("Username must be alphanumeric :3")
            return redirect(url_for("signup"))

        if not len(requestData["password"]) > int(PASSWORD_REQUIREMENT):
            await flash("Password must contain at least " + PASSWORD_REQUIREMENT + " characters")
            return redirect(url_for("signup"))

        hashedpassword = generate_password_hash(requestData["password"])

        conn = get_db_connection()
        conn.execute("INSERT INTO users (username, password, created, htmldescription) VALUES (?, ?, ?, ?)",
                     (requestData["username"], hashedpassword, str(time.time()), ""))
        conn.commit()
        conn.close()

        return redirect(url_for("login"))
    else:
        return await render_template("signup.html")


@app.route("/login", methods=("GET", "POST"))
async def login():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        redirect(url_for("main"))
    if request.method == "POST":
        requestData = await request.form

        userID = check_username_taken(requestData["username"])
        user = get_user(userID)

        if user == "error":
            await flash("Wrong username or password :3")
            return redirect(url_for("login"))

        if not check_password_hash(user["password"], (requestData["password"])):
            await flash("Wrong username or password :3")
            return redirect(url_for("login"))

        randomCharacters = secrets.token_hex(512)

        conn = get_db_connection()
        conn.execute("INSERT INTO sessions (session, id) VALUES (?, ?)",
                     (randomCharacters, userID))
        conn.commit()
        conn.close()

        response = Response("""<script>window.location.href = "/";</script>""")
        response.set_cookie("session_DO_NOT_SHARE", randomCharacters)
        return response

        #resp = await make_response(redirect("/"))
        #resp.set_cookie("session_DO_NOT_SHARE", randomCharacters, expires=datetime.datetime.now() + datetime.timedelta(days=float(180)))

        #return redirect("/")

    else:
        return await render_template("login.html")


@app.route("/settings", methods=("GET", "POST"))
async def settings():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])

        return await render_template("settings.html", userdata=user, createddate=datetime.datetime.utcfromtimestamp(int(str(user["created"]).split(".")[0])).strftime("%Y-%m-%d %H:%m:%S"))
    else:
        return redirect("/")


@app.route("/api/delete", methods=("GET", "POST"))
async def delete():
    usersession = request.cookies.get("session_DO_NOT_SHARE")

    if request.method == "POST":
        data = await request.get_json()
        postid = int(data["id"])

        post = get_post(postid)
        if not post == "error":
            if usersession:
                userCookie = get_session(usersession)
                user = get_user(userCookie["id"])

                if (str(user["administrator"]) == "1") or (int(user["id"]) == int(post["creator"])):
                    post = get_post(postid)
                    conn = get_db_connection()
                    conn.execute("DELETE FROM posts WHERE id = ?", (postid,))
                    conn.commit()
                    conn.close()
                    return "success", 200
                else:
                    return {
                        "error": "https://http.cat/images/403.jpg"
                    }, 403
    else:
        return {
            "error": "https://http.cat/images/400.jpg"
        }, 400

@app.route("/listusers", methods=("GET", "POST"))
async def listusers():
    usersession = request.cookies.get("session_DO_NOT_SHARE")
    if usersession:
        userCookie = get_session(usersession)
        user = get_user(userCookie["id"])
        if str(user["administrator"]) == "1":
            thing = ""

            conn = get_db_connection()
            users = conn.execute("SELECT * FROM users").fetchall()
            conn.close()
            for x in users:
                thing = str(x["id"]) + " - " + x["username"] + "<br>" + thing

            return thing
        else:
            return """<img src="https://http.cat/images/403.jpg">"""
    else:
        return redirect(url_for("login"))


@app.route("/settings/logout", methods=("GET", "POST"))
async def logout():
    resp = redirect(url_for("main"))
    session = request.cookies.get("session_DO_NOT_SHARE")
    resp.delete_cookie("session_DO_NOT_SHARE")

    return resp

@app.errorhandler(500)
async def page_not_found(e):
    return """<img src="https://http.cat/images/500.jpg">""", 500

@app.errorhandler(400)
async def page_not_found(e):
    return """<img src="https://http.cat/images/400.jpg">""", 400

@app.errorhandler(429)
async def page_not_found(e):
    return """<img src="https://http.cat/images/429.jpg">""", 429

@app.errorhandler(404)
async def page_not_found(e):
    return """<img src="https://http.cat/images/404.jpg">""", 404

@app.errorhandler(413)
async def page_not_found(e):
    return "Images can't be larger than " + str(UPLOAD_LIMIT) + "MB", 413


if __name__ == "__main__":
    print("[INFO] Server started")

    hypercornconfig = Config()
    hypercornconfig.bind = ("0.0.0.0" + ":" + PORT)

    asyncio.run(serve(app, hypercornconfig))

    print("[INFO] Server stopped")