import os
import uuid
from datetime import datetime, timezone

from flask import (
    Blueprint,
    current_app,
    flash,
    jsonify,
    redirect,
    render_template,
    request,
    send_from_directory,
    url_for,
)
from flask_login import current_user, login_required
from werkzeug.utils import secure_filename

from app import db
from app.auth_utils import photo_owner_or_admin
from app.models import Photo

bp = Blueprint("main", __name__)


def allowed_file(filename):
    return (
        "." in filename
        and filename.rsplit(".", 1)[1].lower() in current_app.config["ALLOWED_EXTENSIONS"]
    )


@bp.route("/")
def index():
    photos = Photo.query.order_by(Photo.created_at.desc()).limit(24).all()
    total_photos = Photo.query.count()
    total_size = db.session.query(db.func.coalesce(db.func.sum(Photo.file_size), 0)).scalar() or 0
    return render_template(
        "index.html",
        photos=photos,
        total_photos=total_photos,
        total_size=int(total_size),
        max_upload_mb=current_app.config["MAX_CONTENT_LENGTH"] // (1024 * 1024),
    )


@bp.route("/upload", methods=["POST"])
@login_required
def upload():
    if "photo" not in request.files:
        flash("Файл не выбран", "error")
        return redirect(request.referrer or url_for("main.index"))

    file = request.files["photo"]
    if file.filename == "":
        flash("Файл не выбран", "error")
        return redirect(request.referrer or url_for("main.index"))

    if not allowed_file(file.filename):
        flash("Недопустимый формат. Разрешены: PNG, JPG, GIF, WEBP, BMP", "error")
        return redirect(request.referrer or url_for("main.index"))

    ext = file.filename.rsplit(".", 1)[1].lower()
    stored_name = f"{uuid.uuid4().hex}.{ext}"
    safe_original = secure_filename(file.filename) or f"photo.{ext}"

    upload_dir = current_app.config["UPLOAD_FOLDER"]
    filepath = os.path.join(upload_dir, stored_name)
    file.save(filepath)
    file_size = os.path.getsize(filepath)

    photo = Photo(
        filename=stored_name,
        original_name=safe_original,
        file_size=file_size,
        mime_type=file.content_type or f"image/{ext}",
        user_id=current_user.id,
        created_at=datetime.now(timezone.utc),
    )
    db.session.add(photo)
    db.session.commit()

    flash("Фото успешно загружено", "success")
    return redirect(url_for("cabinet.index"))


@bp.route("/api/photos")
def api_photos():
    photos = Photo.query.order_by(Photo.created_at.desc()).all()
    return jsonify(
        [
            {
                "id": p.id,
                "url": p.url,
                "original_name": p.original_name,
                "file_size": p.file_size,
                "size_human": p.size_human,
                "user_id": p.user_id,
                "created_at": p.created_at.isoformat(),
            }
            for p in photos
        ]
    )


@bp.route("/uploads/<path:filename>")
def uploaded_file(filename):
    return send_from_directory(current_app.config["UPLOAD_FOLDER"], filename)


@bp.route("/delete/<int:photo_id>", methods=["POST"])
@login_required
def delete_photo(photo_id):
    photo = Photo.query.get_or_404(photo_id)
    photo_owner_or_admin(photo)

    filepath = os.path.join(current_app.config["UPLOAD_FOLDER"], photo.filename)
    if os.path.exists(filepath):
        os.remove(filepath)
    db.session.delete(photo)
    db.session.commit()
    flash("Фото удалено", "success")
    return redirect(request.referrer or url_for("main.index"))


cabinet_bp = Blueprint("cabinet", __name__, url_prefix="/cabinet")


@cabinet_bp.route("/")
@login_required
def index():
    photos = (
        Photo.query.filter_by(user_id=current_user.id)
        .order_by(Photo.created_at.desc())
        .all()
    )
    total_size = sum(p.file_size for p in photos)
    return render_template(
        "cabinet/index.html",
        photos=photos,
        total_photos=len(photos),
        total_size=total_size,
        max_upload_mb=current_app.config["MAX_CONTENT_LENGTH"] // (1024 * 1024),
    )


@cabinet_bp.route("/profile", methods=["GET", "POST"])
@login_required
def profile():
    from app.models import User

    if request.method == "POST":
        email = request.form.get("email", "").strip().lower()
        current_password = request.form.get("current_password", "")
        new_password = request.form.get("new_password", "")
        new_password2 = request.form.get("new_password2", "")

        other = User.query.filter(User.email == email, User.id != current_user.id).first()
        if other:
            flash("Этот email уже используется", "error")
        elif not current_user.check_password(current_password):
            flash("Неверный текущий пароль", "error")
        elif new_password and len(new_password) < 6:
            flash("Новый пароль — минимум 6 символов", "error")
        elif new_password and new_password != new_password2:
            flash("Новые пароли не совпадают", "error")
        else:
            current_user.email = email
            if new_password:
                current_user.set_password(new_password)
            db.session.commit()
            flash("Профиль обновлён", "success")
            return redirect(url_for("cabinet.profile"))

    return render_template("cabinet/profile.html")