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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
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#   http://www.apache.org/licenses/LICENSE-2.0
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from typing import Union

from airflow.exceptions import AirflowException
from airflow.providers.databricks.hooks.databricks import RunState


def deep_string_coerce(content, json_path: str = 'json') -> Union[str, list, dict]:
    """
    Coerces content or all values of content if it is a dict to a string. The
    function will throw if content contains non-string or non-numeric types.
    The reason why we have this function is because the ``self.json`` field must be a
    dict with only string values. This is because ``render_template`` will fail
    for numerical values.
    """
    coerce = deep_string_coerce
    if isinstance(content, str):
        return content
    elif isinstance(
        content,
        (
            int,
            float,
        ),
    ):
        # Databricks can tolerate either numeric or string types in the API backend.
        return str(content)
    elif isinstance(content, (list, tuple)):
        return [coerce(e, f'{json_path}[{i}]') for i, e in enumerate(content)]
    elif isinstance(content, dict):
        return {k: coerce(v, f'{json_path}[{k}]') for k, v in list(content.items())}
    else:
        param_type = type(content)
        msg = f'Type {param_type} used for parameter {json_path} is not a number or a string'
        raise AirflowException(msg)


def validate_trigger_event(event: dict):
    """
    Validates correctness of the event
    received from :class:`~airflow.providers.databricks.triggers.databricks.DatabricksExecutionTrigger`
    """
    keys_to_check = ['run_id', 'run_page_url', 'run_state']
    for key in keys_to_check:
        if key not in event:
            raise AirflowException(f'Could not find `{key}` in the event: {event}')

    try:
        RunState.from_json(event['run_state'])
    except Exception:
        raise AirflowException(f'Run state returned by the Trigger is incorrect: {event["run_state"]}')
