import os

from cs50 import SQL
from flask import Flask, flash, redirect, render_template, request, session
from flask_session import Session
from tempfile import mkdtemp
from werkzeug.exceptions import default_exceptions
from werkzeug.security import check_password_hash, generate_password_hash

from helpers import apology, login_required, lookup, usd

# Configure application
app = Flask(__name__)

# Ensure templates are auto-reloaded
app.config["TEMPLATES_AUTO_RELOAD"] = True

# Ensure responses aren't cached
@app.after_request
def after_request(response):
    response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
    response.headers["Expires"] = 0
    response.headers["Pragma"] = "no-cache"
    return response

# Custom filter
app.jinja_env.filters["usd"] = usd

# Configure session to use filesystem (instead of signed cookies)
app.config["SESSION_FILE_DIR"] = mkdtemp()
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)

# Configure CS50 Library to use SQLite database
db = SQL("sqlite:///finance.db")


@app.route("/")
@login_required
def index():
    userRows = db.execute("SELECT * FROM portfolio WHERE id = :uniqueid",
                          unique=session["user_id"])

    seenStocks = {}
    stockPrices = {}
    for row in userRows:
        if row not in seenStocks:
            seenStocks[row["symbol"]] = row["shares"]
        else:
            seenStocks[row["symbol"]] = seenStocks[row["symbol"]] + row["shares"]

    for key, value in seenStocks:
        price = lookup(request.form.get("symbol"))["price"]
        stockPrices[key] = price

    seenStocksList = []
    stockPricesList = []
    seenStockShares = []
    totalPriceList = []
    for key, value in seenStocks:
        seenStocksList.append(key)
        seenStockShares.append(value)

    for price, shares in stockPricesList, seenStockShares:
        totalPriceList.append(price * shares)

    for value in stockPricesList:
        stockPricesList.append(value)

    return render_template("buy.html", names=seenStocksList, shares=seenStockShares, stockPrices=stockPricesList, totalPrices=totalPriceList)
    """Show portfolio of stocks"""



@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
    """Buy shares of stock"""
    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # Ensure symbol was entered
        if not request.form.get("symbol"):
            return apology("must provide symbol", 403)

        # Ensure password was submitted
        elif not request.form.get("numOfShares"):
            return apology("must provide number", 403)

        # Query database for username
        cashAmount = db.execute("SELECT users FROM users WHERE id=session[user_id]")

        stock = lookup(request.form.get("symbol"))

        if stock == None:
            return apology("invalid symbol", 403)

        totalPrice = stock["price"] * request.form.get("numOfShares")

        if stock["price"] * request.form.get("numOfShares") > cashAmount:
            return apology("invalid amount of cash", 403)
        else:
            result = db.execute("INSERT INTO  portfolio (id, symbol, shares, price) VALUES(id, :symbol, :shares, :price)",
                id=session["user_id"], symbol=stock["symbol"], shares=request.form.get("numOfShares"), price=stock["price"])
            secondResult = db.execute("UPDATE users SET cash = cash - totalPrice where id = session[user_id]")


        return redirect("/")

    # User reached route via GET (as by clicking a link or via redirect)
    else:
        return render_template("buy.html")


@app.route("/history")
@login_required
def history():
    """Show history of transactions"""
    return apology("TODO")


@app.route("/login", methods=["GET", "POST"])
def login():
    """Log user in"""

    # Forget any user_id
    session.clear()

    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # Ensure username was submitted
        if not request.form.get("username"):
            return apology("must provide username", 403)

        # Ensure password was submitted
        elif not request.form.get("password"):
            return apology("must provide password", 403)

        # Query database for username
        rows = db.execute("SELECT * FROM users WHERE username = :username",
                          username=request.form.get("username"))

        # Ensure username exists and password is correct
        if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
            return apology("invalid username and/or password", 403)

        # Remember which user has logged in
        session["user_id"] = rows[0]["id"]

        return render_template("index.html")

    # User reached route via GET (as by clicking a link or via redirect)
    else:
        return render_template("login.html")


@app.route("/logout")
def logout():
    """Log user out"""

    # Forget any user_id
    session.clear()

    # Redirect user to login form
    return redirect("/")


@app.route("/quote", methods=["GET", "POST"])
@login_required
def quote():
    """Get stock quote."""
    if request.method == "POST":

        quote = lookup(request.form.get("stock"))

        if quote != None:
            return render_template("stock.html", stock=quote["name"], price=quote["price"], symbol=quote["symbol"])
        else:
            return apology("Invalid Stock Name", 403)
    else:
        return render_template("quote.html")



@app.route("/register", methods=["GET", "POST"])
def register():
    """Register user"""
    if request.method == "POST":

        # Ensure username was submitted
        if not request.form.get("username"):
            return apology("Must Provide Username", 403)

        # Ensure password was submitted
        elif not request.form.get("password"):
            return apology("Must Provide Password", 403)

        elif not request.form.get("password-confirmation"):
            return apology("Must Provide Password Confirmation", 403)

        elif request.form.get("password-confirmation") != request.form.get("password"):
            return apology("Password & Password Confimation Must Match!")

        hashedPassword = generate_password_hash(request.form.get("password"))

        result = db.execute("INSERT INTO  users (username, hash) VALUES(:username, :hash)", username=request.form.get("username"), hash=hashedPassword)

        if not result:
            return apology("Username already exists!")

        rows = db.execute("SELECT * FROM users WHERE username = :username",
                          username=request.form.get("username"))

        session["user_id"] = rows[0]["id"]

        return render_template("register.html")

    else:
        return render_template("register.html")

@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
    """Sell shares of stock"""
    return apology("TODO")


def errorhandler(e):
    """Handle error"""
    return apology(e.name, e.code)


# listen for errors
for code in default_exceptions:
    app.errorhandler(code)(errorhandler)