from datetime import datetime

import flask_login
from flask_socketio import join_room

from flask import (
    Blueprint,
    current_app,  # Used for logging
    flash,
    make_response,
    redirect,
    render_template,
    request,
    url_for,
)

from . import socketio

from .auth import user_loader
from .models import Password, db
from .utils import (
    create_token,
    get_active_banner,
    get_all_courses,
    get_token,
    get_unlocked_decks,
    retrieve_token,
    update_token,
    get_course,
    token_required,
    set_cookie,
)


main = Blueprint("main", __name__)


@socketio.on("connect")
def on_connect():
    if flask_login.current_user.is_authenticated:
        join_room("instructor")
        current_app.logger.info(
            f"Instructor connected to socket: {flask_login.current_user.id}"
        )


@main.route("/")
@token_required
def index(token):
    current_app.logger.debug(
        f"User {token.name} is viewing index with {len(token.decks)} decks unlocked."
    )
    return render_template(
        "index.html",
        active_banner=get_active_banner(),
        decks=get_unlocked_decks(token),
        user_name=token.name,
        active_course_name=token.active_course.name,
        courses=get_all_courses(),
    )


@main.route("/set_token", methods=["POST", "GET"])
def set_token():
    """
    Handles.
    GET: Renders the registration form.
    POST: Processes the form submission.
    """
    if request.method == "POST":
        # Get form data
        username = request.form.get("username")

        # Simple validation
        if not username:
            flash("Username is required.", "error")
            return render_template("set_token.html")

        if user_loader(username):
            current_app.logger.info(
                f"Admin username '{username}' entered in set_token. Redirecting to admin login."
            )
            return redirect(url_for("admin.admin_login"))

        token = retrieve_token(username)

        if not token:
            flash(f'The username "{username}" does not exist.', "error")
            current_app.logger.warning(
                f"Login failed: Username '{username}' not found."
            )
            return render_template("set_token.html")

        current_app.logger.info(f"User logged in: {username}")
        return set_cookie(token)

    return render_template("set_token.html")


@main.route("/register", methods=["POST", "GET"])
def register():
    """
    Handles user registration.
    GET: Renders the registration form.
    POST: Processes the form submission.
    """
    if request.method == "POST":
        # Get form data
        user_name = request.form.get("username")
        acknowledge = request.form.get("acknowledge")

        # Simple validation
        if not user_name:
            flash("Username is required.", "error")
            current_app.logger.debug("Username is required for registering")
            return render_template("register.html")

        if retrieve_token(user_name):
            flash(f'The username "{user_name}" is already taken.', "error")
            current_app.logger.debug(f"Username {user_name} is already registered")
            return render_template("register.html")

        if not acknowledge:
            flash("You must acknowledge the important information to proceed.", "error")
            current_app.logger.debug("User did not acknowledge register information")
            return render_template("register.html")

        # If all validation passes, "register" the user
        token = create_token(user_name)
        current_app.logger.info(f"New user registered: {user_name}")

        return set_cookie(token)

    # If GET request, render the form
    return render_template("register.html")


@main.route("/logout", methods=["POST"])
def logout():
    token = get_token()
    user_name = token.name if token else "Unknown"

    if flask_login.current_user.is_authenticated:
        current_app.logger.info(f"Admin logout: {flask_login.current_user.id}")
        flask_login.logout_user()

    current_app.logger.info(f"User logout: {user_name}")

    resp = make_response(redirect(url_for("main.index")))
    resp.set_cookie("access_token", "", expires=0)
    return resp


@main.route("/switch_course/<int:new_course>", methods=["POST"])
@token_required
def switch_course(new_course: int, token):
    switched = get_course(new_course)

    if switched:
        token.active_course = switched
        db.session.commit()
        current_app.logger.info(
            f"User {token.name} switched to course: {switched.name}"
        )
    else:
        current_app.logger.warning(
            f"User {token.name} attempted to switch to invalid course ID: {new_course}"
        )

    return redirect(url_for("main.index"))


def process_access_code(access_code: str, token):
    password = db.session.execute(
        db.select(Password).where(Password.value == access_code)
    ).scalar_one_or_none()

    if password is not None:
        if not password.is_expired():
            update_token(password.decks)
            current_app.logger.info(f"User {token.name} used valid access code.")
        else:
            current_app.logger.info(f"User {token.name} used expired access code.")
            flash("Password has expired. Please obtain a new one.", "expired")
    else:
        current_app.logger.warning(
            f"User {token.name} used invalid access code: {access_code}"
        )
        flash("Password is not valid. Please check the code and try again.", "error")
    return redirect(url_for("main.index"))


@main.route("/access", methods=["POST"])
@token_required
def access_post(token):
    access_code = request.form.get("password")

    if not access_code:
        return redirect(url_for("main.index"))

    return process_access_code(access_code, token)


# Route for direct link/QR code access (GET)
@main.route("/access/<access_code>", methods=["GET"])
@token_required
def access_get(access_code: str, token):
    return process_access_code(access_code, token)


@main.route("/confused", methods=["POST"])
def confused():
    socketio.emit("confused", {"time": datetime.utcnow().isoformat()}, to="instructor")
    return ("", 204)