import os

from cs50 import SQL
from flask import Flask, flash, jsonify, redirect, render_template, request, session
from flask_session import Session
from tempfile import mkdtemp
from werkzeug.exceptions import default_exceptions, HTTPException, InternalServerError
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():
    """Show portfolio of stocks"""

    return render_template("index.html")


@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
    """Buy shares of stock"""
    if request.method == "POST":
        symbol = request.form.get("symbol")
        if not symbol:
            return apology("missing symbol", 400)
        elif not lookup(symbol):
            return apology("invaild symbol", 400)
        elif not int(request.form.get("shares")) > 0:
            return apology("Share must be greater than 0", 400)

        userid = session["user_id"]
        my_dict=lookup(symbol)
        rows = db.execute("SELECT cash FROM users WHERE id = :userid",userid=userid)
        cash = float(rows[0]["cash"])
        symbol = my_dict["symbol"]
        companyname = my_dict["name"]
        shares = int(request.form.get("shares"))
        price = float(my_dict["price"])
        total = price * shares

        if cash < total:
            return apology("can't afford", 400)
        db.execute("INSERT INTO transaction (userid,symbol,companyname,shares,price,total) VALUES (:userid, :symbol, :companyname, :shares, :price, :total) ",userid=userid, symbol=symbol, companyname=companyname, shares=shares, price=price, total=total)
        db.execute("UPDATE users SET cash = cash - :total WHERE id = :userid",total,userid=userid)

    else:
        return render_template("buy.html")


@app.route("/check", methods=["GET"])
def check():
    """Return true if username available, else false, in JSON format"""

    return jsonify("TODO")


@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"]

        # Redirect user to home page
        return redirect("/")

    # 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":
        if not request.form.get("symbol"):
            return apology("missing symbol", 400)
        symbol = request.form.get("symbol")
        if lookup(symbol):
            my_dict = lookup(symbol)
            return render_template("quoted.html",
            name = my_dict['name'], price = usd(my_dict['price']), sym = my_dict['symbol'])
        else:
            return apology("invalid symbol", 400)
    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 is correct
        elif not request.form.get("password"):
            return apology("must provide password", 403)
        elif not request.form.get("confirmation"):
            return apology("must confirm password", 403)
        elif request.form.get("password") != request.form.get("confirmation"):
            return apology("not same password", 403)
        # Insert database for username
        result = db.execute("INSERT INTO users (username,hash) VALUES (:username, :password)",
        username=request.form.get("username")
        ,password=generate_password_hash(request.form.get("password")))
        if not result:
            return apology("Try different username", 403)
        # Redirect user to home page
        return redirect("/")
    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"""
    if not isinstance(e, HTTPException):
        e = InternalServerError()
    return apology(e.name, e.code)


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