from flask import Flask, render_template, request, redirect, url_for, flash
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
from werkzeug.utils import secure_filename
import os

app = Flask(__name__)
app.config["SECRET_KEY"] = "secret_key_here"
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///studyverse.db"
app.config["UPLOAD_FOLDER"] = "uploads/"

db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "login"

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, nullable=False)
    password = db.Column(db.String(128), nullable=False)

class Assignment(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(128), nullable=False)
    file = db.Column(db.String(128), nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey("user.id"))
    user = db.relationship("User", backref=db.backref("assignments", lazy=True))

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

@app.route("/")
def index():
    return """
    <!DOCTYPE html>
    <html>
      <head>
        <title>StudyVerse</title>
      </head>
      <body>
        <h1>Welcome to StudyVerse!</h1>
        <p><a href="/signup">Sign up</a> or <a href="/login">Login</a></p>
      </body>
    </html>
    """

@app.route("/signup", methods=["GET", "POST"])
def signup():
    if request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]
        user = User(username=username, password=password)
        db.session.add(user)
        db.session.commit()
        flash("Sign up successful!")
        return redirect(url_for("login"))
    return """
    <!DOCTYPE html>
    <html>
      <head>
        <title>Sign Up - StudyVerse</title>
      </head>
      <body>
        <h1>Sign Up</h1>
        <form action="/signup" method="POST">
          <label for="username">Username:</label><br>
          <input type="text" id="username" name="username" required><br><br>
          <label for="password">Password:</label><br>
          <input type="password" id="password" name="password" required><br><br>
          <input type="submit" value="Sign Up">
        </form>
      </body>
    </html>
    """

@app.route("/login", methods=["GET", "POST"])
def login():
    if request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]
        user = User.query.filter_by(username=username).first()
        if user and user.password == password:
            login_user(user)
            flash("Login successful!")
            return redirect(url_for("dashboard"))
        else:
            flash("Invalid username or password")
    return """
    <!DOCTYPE html>
    <html>
      <head>
        <title>Login - StudyVerse</title>
      </head>
      <body>
        <h1>Login</h1>
        <form action="/login" method="post">
          <label for="username">Username:</label>
          <input type="text" id="username" name="username"><br><br>
          <label for="password">Password:</label>
          <input type="password" id="password" name="password"><br><br>
          <input type="submit" value="Login">
        </form>
      </body>
    </html>
    """

@app.route("/logout")
@login_required
def logout():
    logout_user()
    flash("Logged out successfully!")
    return redirect(url_for("index"))

@app.route("/dashboard")
@login_required
def dashboard():
    assignments = Assignment.query.filter_by(user_id=current_user.id).all()
    assignment_list = ""
    for assignment in assignments:
        assignment_list += f"<li>{assignment.title}</li>"
    return f"""
    <!DOCTYPE html>
    <html>
      <head>
        <title>Dashboard - StudyVerse</title>
      </head>
      <body>
        <h1>Welcome to Your Dashboard</h1>
        <p>Hello, {current_user.username}!</p>
        <h2>Your Assignments:</h2>
        <ul>
          {assignment_list}
        </ul>
        <p><a href="/upload">Upload Assignment</a> | <a href="/logout">Logout</a></p>
      </body>
    </html>
    """

@app.route("/upload", methods=["GET", "POST"])
@login_required
def upload():
    if request.method == "POST":
        file = request.files["file"]
        filename = secure_filename(file.filename)
        file.save(os.path.join(app.config["UPLOAD_FOLDER"], filename))
        assignment = Assignment(title=request.form["title"], file=filename, user_id=current_user.id)
        db.session.add(assignment)
        db.session.commit()
        flash("Assignment uploaded successfully!")
        return redirect(url_for("dashboard"))
    return """
    <!DOCTYPE html>
    <html>
      <head>
        <title>Upload Assignment - StudyVerse</title>
      </head>
      <body>
        <h1>Upload Assignment</h1>
        <form action="/upload" method="POST" enctype="multipart/form-data">
          <label for="title">Title:</label><br>
          <input type="text" id="title" name="title" required><br><br>
          <label for="file">File:</label><br>
          <input type="file" id="file" name="file" required><br><br>
          <input type="submit" value="Upload">
        </form>
        <p><a href="/dashboard">Back to Dashboard</a></p>
      </body>
    </html>
    """

@app.route("/chat")
@login_required
def chat():
    return """
    <!DOCTYPE html>
    <html>
      <head>
        <title>Chat - StudyVerse</title>
      </head>
      <body>
        <h1>Chat Room</h1>
        <p>This is the chat room. You can start chatting here.</p>
        <p><a href="/dashboard">Back to Dashboard</a></p>
      </body>
    </html>
    """

if __name__ == "__main__":
    app.run(debug=True)
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