from flask import Blueprint, request, jsonify, session
from ..models.user import User
from .. import db

auth_bp = Blueprint("auth", __name__, url_prefix="/api/auth")


@auth_bp.route("/signup", methods=["POST"])
def signup():
    data = request.get_json(silent=True) or {}
    username = (data.get("username") or "").strip()
    email    = (data.get("email") or "").strip().lower()
    password = data.get("password") or ""

    if not username or not email or not password:
        return jsonify({"error": "username, email and password are required"}), 400

    if len(password) < 8:
        return jsonify({"error": "Password must be at least 8 characters"}), 400

    if User.query.filter(
        (User.username == username) | (User.email == email)
    ).first():
        return jsonify({"error": "Username or email already exists"}), 409

    user = User(username=username, email=email)
    user.set_password(password)
    db.session.add(user)
    db.session.commit()

    session["user_id"] = user.id
    return jsonify({"message": "Account created", "user": user.to_dict()}), 201


@auth_bp.route("/login", methods=["POST"])
def login():
    data     = request.get_json(silent=True) or {}
    identity = (data.get("email") or data.get("username") or "").strip()
    password = data.get("password") or ""

    if not identity or not password:
        return jsonify({"error": "Email/username and password are required"}), 400

    user = User.query.filter(
        (User.email == identity.lower()) | (User.username == identity)
    ).first()

    if not user or not user.check_password(password):
        return jsonify({"error": "Invalid credentials"}), 401

    session["user_id"] = user.id
    return jsonify({"message": "Logged in", "user": user.to_dict()}), 200


@auth_bp.route("/logout", methods=["POST"])
def logout():
    session.pop("user_id", None)
    return jsonify({"message": "Logged out"}), 200


@auth_bp.route("/me", methods=["GET"])
def me():
    uid = session.get("user_id")
    if not uid:
        return jsonify({"error": "Not authenticated"}), 401
    user = User.query.get(uid)
    if not user:
        return jsonify({"error": "User not found"}), 404
    return jsonify({"user": user.to_dict()}), 200