"""API routes for DocVault."""

import mimetypes

import requests
from flask import Blueprint, Response, jsonify, request, stream_with_context
from werkzeug.utils import secure_filename

from server import config
from server.storage.factory import get_storage
from server.utils.logger import setup_logger
from server.utils.validators import PathValidator


api_bp = Blueprint("api", __name__, url_prefix="/api")
logger = setup_logger(__name__)


def get_user_id_from_request() -> str:
    return request.headers.get("X-User-ID", config.DEFAULT_USER_ID)


def allowed_file(filename: str) -> bool:
    if "." not in filename:
        return False
    return filename.rsplit(".", 1)[1].lower() in config.ALLOWED_EXTENSIONS


def _storage():
    return get_storage()


def _item_type(storage, user_id: str, path: str) -> str | None:
    if hasattr(storage, "get_item_type"):
        return storage.get_item_type(user_id, path)
    return None


@api_bp.route("/health", methods=["GET"])
def health_check():
    return jsonify(
        {
            "storage": config.HF_STORAGE_LABEL,
            "repo": config.HF_REPO_ID,
            "status": "ok",
        }
    ), 200


@api_bp.route("/create-folder", methods=["POST"])
def create_folder():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        folder_path = (data.get("folder_path") or "").strip()
        if not folder_path:
            return jsonify({"success": False, "error": "folder_path is required"}), 400

        result = _storage().create_folder(user_id, folder_path)
        return jsonify(result), 201 if result.get("success") else 400
    except ValueError as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    except Exception as exc:
        logger.error("create_folder failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/upload", methods=["POST"])
@api_bp.route("/upload-file", methods=["POST"])
def upload_file():
    try:
        user_id = get_user_id_from_request()
        folder_path = (request.form.get("folder_path") or "").strip()

        if "file" not in request.files:
            return jsonify({"success": False, "error": "No file provided"}), 400

        file = request.files["file"]
        if not file.filename:
            return jsonify({"success": False, "error": "No file selected"}), 400

        filename = secure_filename(file.filename)
        if not filename:
            return jsonify({"success": False, "error": "Invalid filename"}), 400
        if not allowed_file(filename):
            return jsonify({"success": False, "error": "File type not allowed"}), 400
        if not PathValidator.is_valid_filename(filename):
            return jsonify({"success": False, "error": "Invalid filename"}), 400

        result = _storage().upload_file(user_id, folder_path, filename, file)
        return jsonify(result), 201 if result.get("success") else 400
    except ValueError as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    except Exception as exc:
        logger.error("upload failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/delete", methods=["POST"])
def delete_item():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        storage = _storage()

        file_path = (data.get("file_path") or "").strip()
        folder_path = (data.get("folder_path") or "").strip()
        path = (data.get("path") or "").strip()
        item_type = (data.get("type") or "").strip().lower()

        if file_path:
            result = storage.delete_file(user_id, file_path)
        elif folder_path:
            result = storage.delete_folder(user_id, folder_path)
        elif path:
            if item_type == "file":
                result = storage.delete_file(user_id, path)
            elif item_type == "folder":
                result = storage.delete_folder(user_id, path)
            else:
                resolved_type = _item_type(storage, user_id, path)
                if resolved_type == "file":
                    result = storage.delete_file(user_id, path)
                elif resolved_type == "folder":
                    result = storage.delete_folder(user_id, path)
                else:
                    result = {"success": False, "error": "Item not found", "code": "NOT_FOUND"}
        else:
            return jsonify({"success": False, "error": "path is required"}), 400

        return jsonify(result), 200 if result.get("success") else 400
    except Exception as exc:
        logger.error("delete failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/delete-file", methods=["POST"])
def delete_file_alias():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        file_path = (data.get("file_path") or data.get("path") or "").strip()
        if not file_path:
            return jsonify({"success": False, "error": "file_path is required"}), 400
        result = _storage().delete_file(user_id, file_path)
        return jsonify(result), 200 if result.get("success") else 400
    except Exception as exc:
        logger.error("delete_file failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/delete-folder", methods=["POST"])
def delete_folder_alias():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        folder_path = (data.get("folder_path") or data.get("path") or "").strip()
        if not folder_path:
            return jsonify({"success": False, "error": "folder_path is required"}), 400
        result = _storage().delete_folder(user_id, folder_path)
        return jsonify(result), 200 if result.get("success") else 400
    except Exception as exc:
        logger.error("delete_folder failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/list", methods=["GET"])
def list_contents():
    try:
        user_id = get_user_id_from_request()
        folder_path = (
            request.args.get("folder_path", request.args.get("path", "")) or ""
        ).strip()
        result = _storage().list(user_id, folder_path)
        return jsonify(result), 200 if result.get("success") else 400
    except ValueError as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    except Exception as exc:
        logger.error("list failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/rename", methods=["POST"])
def rename_item():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        item_path = (data.get("item_path") or "").strip()
        new_name = (data.get("new_name") or "").strip()
        if not item_path or not new_name:
            return jsonify({"success": False, "error": "item_path and new_name are required"}), 400

        storage = _storage()
        item_type = _item_type(storage, user_id, item_path)
        if item_type == "file":
            result = storage.rename_file(user_id, item_path, new_name)
        elif item_type == "folder":
            result = storage.rename_folder(user_id, item_path, new_name)
        else:
            result = {"success": False, "error": "Item not found", "code": "NOT_FOUND"}

        return jsonify(result), 200 if result.get("success") else 400
    except ValueError as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    except Exception as exc:
        logger.error("rename failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/storage-stats", methods=["GET"])
def storage_stats():
    try:
        user_id = get_user_id_from_request()
        result = _storage().get_stats(user_id)
        return jsonify(result), 200 if result.get("success") else 400
    except Exception as exc:
        logger.error("storage_stats failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/download/<path:file_path>", methods=["GET"])
def download_file(file_path: str):
    try:
        user_id = get_user_id_from_request()
        download_info = _storage().download(user_id, file_path)
        headers = {"Authorization": f"Bearer {config.HF_TOKEN}"}
        upstream = requests.get(download_info["url"], headers=headers, stream=True, timeout=30)
        upstream.raise_for_status()

        content_type = upstream.headers.get("Content-Type") or mimetypes.guess_type(file_path)[0]
        if not content_type:
            content_type = "application/octet-stream"

        filename = file_path.split("/")[-1]
        disposition = "attachment" if request.args.get("download") == "true" else "inline"

        return Response(
            stream_with_context(upstream.iter_content(chunk_size=8192)),
            content_type=content_type,
            headers={"Content-Disposition": f'{disposition}; filename="{filename}"'},
        )
    except FileNotFoundError as exc:
        return jsonify({"success": False, "error": str(exc)}), 404
    except Exception as exc:
        logger.error("download failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/history", methods=["GET"])
def get_history():
    try:
        user_id = get_user_id_from_request()
        path = (request.args.get("path") or "").strip()
        if not path:
            return jsonify({"success": False, "error": "path is required"}), 400
        return jsonify({"success": True, "history": _storage().get_history(user_id, path)}), 200
    except Exception as exc:
        logger.error("history failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.route("/restore", methods=["POST"])
def restore_version():
    try:
        user_id = get_user_id_from_request()
        data = request.get_json(silent=True) or {}
        path = (data.get("path") or "").strip()
        revision = (data.get("revision") or "").strip()
        as_copy = bool(data.get("as_copy", False))
        if not path or not revision:
            return jsonify({"success": False, "error": "path and revision are required"}), 400
        result = _storage().restore(user_id, path, revision, as_copy=as_copy)
        return jsonify(result), 200 if result.get("success") else 400
    except Exception as exc:
        logger.error("restore failed: %s", exc, exc_info=True)
        return jsonify({"success": False, "error": str(exc)}), 500


@api_bp.errorhandler(404)
def not_found(error):
    return jsonify({"success": False, "error": "Endpoint not found"}), 404


@api_bp.errorhandler(500)
def internal_error(error):
    logger.error("Internal server error: %s", error)
    return jsonify({"success": False, "error": "Internal server error"}), 500