from flask import Blueprint, render_template, request, redirect, url_for, session, flash
from flask_login import login_user
from app.db import get_db
from werkzeug.security import generate_password_hash, check_password_hash

from app.models.user import User

auth_bp = Blueprint("auth", __name__)

@auth_bp.route("/login", methods=["GET", "POST"])
def login():
    if request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]

        db = get_db()
        row = db.execute(
            "SELECT * FROM users WHERE username = ?",
            (username,)
        ).fetchone()

        if row and check_password_hash(row["password"], password):
            user = User(id=row["id"], username=row["username"])
            login_user(user)

            return redirect(url_for("main.home"))
        else:
            flash("Invalid username or password")

    return render_template("login.html")


@auth_bp.route("/register", methods=["GET", "POST"])
def register():
    if request.method == "POST":
        username = request.form.get("username")
        password = request.form.get("password")

        if not username or not password:
            flash("Please fill out all fields")
            return render_template("register.html")

        db = get_db()

        existing_user = db.execute(
            "SELECT id FROM users WHERE username = ?",
            (username,)
        ).fetchone()

        if existing_user:
            flash("Username already taken")
            return render_template("register.html")

        hashed_password = generate_password_hash(password)

        db.execute(
            "INSERT INTO users (username, password) VALUES (?, ?)",
            (username, hashed_password)
        )
        db.commit()

        flash("Account created! Please log in.")
        return redirect(url_for("auth.login"))

    return render_template("register.html")