# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2024)
#
# Licensed 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
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json
from typing import TYPE_CHECKING, Any, List, Union, cast

from streamlit.proto.Json_pb2 import Json as JsonProto
from streamlit.runtime.metrics_util import gather_metrics
from streamlit.runtime.state import QueryParamsProxy, SessionStateProxy
from streamlit.user_info import UserInfoProxy

if TYPE_CHECKING:
    from streamlit.delta_generator import DeltaGenerator


def _ensure_serialization(o: object) -> Union[str, List[Any]]:
    """A repr function for json.dumps default arg, which tries to serialize sets as lists"""
    if isinstance(o, set):
        return list(o)
    return repr(o)


class JsonMixin:
    @gather_metrics("json")
    def json(
        self,
        body: object,
        *,  # keyword-only arguments:
        expanded: bool = True,
    ) -> "DeltaGenerator":
        """Display object or string as a pretty-printed JSON string.

        Parameters
        ----------
        body : object or str
            The object to print as JSON. All referenced objects should be
            serializable to JSON as well. If object is a string, we assume it
            contains serialized JSON.

        expanded : bool
            An optional boolean that allows the user to set whether the initial
            state of this json element should be expanded. Defaults to True.

        Example
        -------
        >>> import streamlit as st
        >>>
        >>> st.json({
        ...     'foo': 'bar',
        ...     'baz': 'boz',
        ...     'stuff': [
        ...         'stuff 1',
        ...         'stuff 2',
        ...         'stuff 3',
        ...         'stuff 5',
        ...     ],
        ... })

        .. output::
           https://doc-json.streamlit.app/
           height: 385px

        """
        import streamlit as st

        if isinstance(body, (SessionStateProxy, UserInfoProxy, QueryParamsProxy)):
            body = body.to_dict()

        if not isinstance(body, str):
            try:
                # Serialize body to string and try to interpret sets as lists
                body = json.dumps(body, default=_ensure_serialization)
            except TypeError as err:
                st.warning(
                    "Warning: this data structure was not fully serializable as "
                    f"JSON due to one or more unexpected keys.  (Error was: {err})"
                )
                body = json.dumps(body, skipkeys=True, default=_ensure_serialization)

        json_proto = JsonProto()
        json_proto.body = body
        json_proto.expanded = expanded
        return self.dg._enqueue("json", json_proto)

    @property
    def dg(self) -> "DeltaGenerator":
        """Get our DeltaGenerator."""
        return cast("DeltaGenerator", self)
