import os

from flask import (
    Blueprint,
    abort,
    current_app,
    flash,
    jsonify,
    redirect,
    render_template,
    request,
    send_file,
    url_for,
)
from flask_login import current_user, login_required

from app import db
from app.auth_utils import photo_owner_or_admin
from app.folder_utils import can_edit_folder
from app.models import Folder, Photo
from app.settings_service import get_settings
from app.storage_service import delete_photo_file, get_photo_stream
from app.upload_service import process_uploads

bp = Blueprint("main", __name__)


@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
    settings = get_settings()
    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),
        max_bulk_upload=settings.max_bulk_upload,
    )


@bp.route("/upload", methods=["POST"])
@login_required
def upload():
    folder_id = request.form.get("folder_id", type=int)
    folder = None
    if folder_id:
        folder = Folder.query.get_or_404(folder_id)
        if not can_edit_folder(folder):
            abort(403)

    result = process_uploads(
        request.files,
        current_user,
        folder,
        current_app.config["ALLOWED_EXTENSIONS"],
    )

    if result["uploaded"] == 0 and result["errors"]:
        flash(result["errors"][0], "error")
    elif result["uploaded"] == 1:
        flash("Фото успешно загружено", "success")
    elif result["uploaded"] > 1:
        flash(f"Загружено {result['uploaded']} фото", "success")

    for err in result["errors"]:
        if result["uploaded"] > 0:
            flash(err, "error")

    if result["uploaded"] > 0:
        from app.email_service import send_upload_notification

        send_upload_notification(
            current_user,
            result["uploaded"],
            folder.name if folder else None,
        )

    if folder:
        return redirect(url_for("folders.view_folder", folder_id=folder.id))
    return redirect(request.referrer or 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):
    photo = Photo.query.filter_by(filename=filename).first()
    storage_backend = photo.storage_backend if photo else "local"

    stream = get_photo_stream(filename, storage_backend)
    if stream is None:
        abort(404)

    mimetype = photo.mime_type if photo else "application/octet-stream"
    return send_file(stream, mimetype=mimetype)


@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)

    delete_photo_file(photo.filename, photo.storage_backend)
    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():
    from app.folder_utils import process_pending_invites
    from app.quota_utils import quota_status

    process_pending_invites(current_user)
    photos = (
        Photo.query.filter_by(user_id=current_user.id, folder_id=None)
        .order_by(Photo.created_at.desc())
        .all()
    )
    folders = Folder.query.filter_by(owner_id=current_user.id).order_by(Folder.created_at.desc()).limit(6).all()
    total_size = sum(p.file_size for p in photos)
    quota = quota_status(current_user)
    settings = get_settings()
    return render_template(
        "cabinet/index.html",
        photos=photos,
        folders=folders,
        total_photos=len(photos),
        total_size=total_size,
        quota=quota,
        max_upload_mb=current_app.config["MAX_CONTENT_LENGTH"] // (1024 * 1024),
        max_bulk_upload=settings.max_bulk_upload,
    )


@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")