"""Handle application level errors."""
import logging
import traceback

from werkzeug.exceptions import NotFound, HTTPException
from flask import (Flask,
                   request,
                   jsonify,
                   render_template)

from gn_auth.auth.errors import AuthorisationError

from .tracing import add_trace
from .http import http_error_handlers

logger = logging.getLogger(__name__)

__all__ = ["register_error_handlers"]


def handle_general_exception(exc: Exception):
    """Handle generic unhandled exceptions."""
    logger.error("Error occurred!", exc_info=True)
    content_type = request.content_type
    if bool(content_type) and content_type.lower() == "application/json":
        exc_args = [str(x) for x in exc.args]
        msg = ("The following exception was raised while attempting to access "
               f"{request.url}: {' '.join(exc_args)}")
        return jsonify(add_trace(exc, {
            "error": type(exc).__name__,
            "error_description": msg
        })), 500

    return render_template("50x.html",
                           page=request.url,
                           error=exc,
                           trace=traceback.format_exception(exc)), 500


def handle_authorisation_error(exc: AuthorisationError):
    """Handle AuthorisationError if not handled anywhere else."""
    logger.error("Error occurred!", exc_info=True)
    logger.error(exc)
    return jsonify(add_trace(exc, {
        "error": type(exc).__name__,
        "error_description": " :: ".join(exc.args)
    })), exc.error_code

__error_handlers__ = {
    Exception: handle_general_exception,
    AuthorisationError: handle_authorisation_error
}


def register_error_handlers(app: Flask):
    """Register ALL defined error handlers"""
    _handlers = {
        **__error_handlers__,
        **http_error_handlers()
    }
    for class_, error_handler in __error_handlers__.items():
        app.register_error_handler(class_, error_handler)