from flask import (
    Blueprint,
    redirect,
    url_for,
    render_template,
    session,
    request,
    jsonify,
    abort,
)
from flask_login import current_user
from forms import FoodItemForm, FoodLogForm
from application import db
from models import FoodItem, FoodLog
from sqlalchemy import and_
from datetime import datetime, timedelta, timezone

bp = Blueprint(
    "add_meal",
    __name__,
    url_prefix="/add_meal",
    template_folder="templates",
)


@bp.before_request
def login_required():
    if not current_user.is_authenticated:
        return redirect(url_for("login"))


@bp.route("/select_meal/<int:meal_type>", methods=["GET"])
def step1(meal_type: int):
    assert type(meal_type) is int
    assert 0 <= meal_type <= 3
    session["meal_type"] = meal_type
    return redirect(url_for("add_meal.step2"))


@bp.route("/get_barcode", methods=["GET"])
def step2():
    return render_template("scan_barcode.html")


@bp.route("/step3/<string:input>", methods=["GET"])
def step3(input: str):
    # check if meal_type cookie is set
    if "meal_type" not in session:
        return redirect("/")

    # Check if input is a barcode
    if input.isdigit():
        item = current_user.food_items.filter_by(barcode=input).first()
        if item is None:
            # Does not exist, add item
            return redirect(url_for("add_meal.step3_alt1", input=input))
    else:
        # input is not a number, must be the name of the item.
        item = current_user.food_items.filter_by(name=input).first()
        if item is None:
            # Does not exist, add manually.
            return redirect(url_for("add_meal.step3_alt1", input=input))

    # Track item to add and continue to next step
    session["item_id"] = item.id
    return redirect(url_for("add_meal.step4"))


@bp.route("/step3_alt1/<string:input>", methods=["GET", "POST"])
def step3_alt1(input: str):
    form = FoodItemForm()
    if form.validate_on_submit():
        print("[DEBUG] Valid form")
        if (
            current_user.food_items.filter_by(
                barcode=form.barcode.data
            ).first()
            is None
        ):
            assert form.name.data is not None
            assert form.energy.data is not None
            assert form.protein.data is not None
            assert form.carbs.data is not None
            assert form.fat.data is not None
            assert form.barcode.data is not None
            db.session.add(
                FoodItem(
                    name=form.name.data,
                    owner_id=current_user.id,
                    energy=form.energy.data,
                    protein=form.protein.data,
                    carbs=form.carbs.data,
                    fat=form.fat.data,
                    barcode=(
                        form.barcode.data
                        if form.barcode.data.isdigit()
                        else None
                    ),
                    saturated_fat=form.saturated_fat.data,
                    sugar=form.sugar.data,
                )
            )
            db.session.commit()
            print("[DEBUG] New item added")
        return redirect(url_for("add_meal.step3", input=form.barcode.data))
    print("[DEBUG] Invalid form")
    if input.isdigit():
        form.barcode.data = input
    else:
        form.name.data = input
    return render_template("add_item.html", form=form)


@bp.route("/step4", methods=["GET", "POST"])
def step4():
    if "item_id" not in session:
        return redirect(url_for("add_meal.step2"))
    form = FoodLogForm()
    item = db.session.get(FoodItem, session["item_id"])

    offset = session["offset"]
    if offset is None or item is None:
        abort(404)

    today = datetime.now(timezone.utc).date()
    day = today + timedelta(days=offset)

    if form.validate_on_submit():
        assert form.amount.data
        db.session.add(
            FoodLog(
                food_item_id=item.id,
                user_id=current_user.id,
                amount=form.amount.data,
                part_of_day=session["meal_type"],
                date_=day,
            )
        )
        db.session.commit()
        session.pop("meal_type")
        session.pop("item_id")
        return redirect(url_for("user.daily_log", offset=offset))

    match session["meal_type"]:
        case 0:
            tod = "Breakfast"
        case 1:
            tod = "Lunch"
        case 2:
            tod = "Dinner"
        case 3:
            tod = "Snack"
        case _:
            tod = "Unknown"
    return render_template("step4.html", tod=tod, item=item, form=form)


@bp.route("/query", methods=["GET"])
def query():
    q = request.args.get("q", "").strip().lower()
    if not q:
        return jsonify([])

    words = q.split()
    filters = [
        FoodItem.name.ilike(f"%{word}%") for word in words  # type: ignore
    ]

    results = current_user.food_items.filter(and_(*filters)).all()
    return jsonify([item.name for item in results])