from typing import Dict, Optional, Union

from pydantic import BaseModel, Extra

from .reference import Reference


class Encoding(BaseModel):
    """A single encoding definition applied to a single schema property."""

    contentType: Optional[str] = None
    """
    The Content-Type for encoding a specific property.
    Default value depends on the property type:
    
    for `object` - `application/json`;
    for `array` – the default is defined based on the inner type;
    for all other cases the default is `application/octet-stream`.
    
    The value can be a specific media type (e.g. `application/json`), a wildcard media type (e.g. `image/*`),
    or a comma-separated list of the two types.
    """

    headers: Optional[Dict[str, Union["Header", Reference]]] = None
    """
    A map allowing additional information to be provided as headers, for example `Content-Disposition`.
    
    `Content-Type` is described separately and SHALL be ignored in this section.
    This property SHALL be ignored if the request body media type is not a `multipart`.
    """

    style: Optional[str] = None
    """
    Describes how a specific property value will be serialized depending on its type.
    
    See [Parameter Object](#parameterObject) for details on the [`style`](#parameterStyle) property.
    The behavior follows the same values as `query` parameters, including default values.
    This property SHALL be ignored if the request body media type
    is not `application/x-www-form-urlencoded` or `multipart/form-data`.
    If a value is explicitly defined,
    then the value of [`contentType`](#encodingContentType) (implicit or explicit) SHALL be ignored.
    """

    explode: bool = False
    """
    When this is true, property values of type `array` or `object` generate separate parameters
    for each value of the array, or key-value-pair of the map.
    
    For other types of properties this property has no effect.
    When [`style`](#encodingStyle) is `form`, the default value is `true`.
    For all other styles, the default value is `false`.
    This property SHALL be ignored if the request body media type
    is not `application/x-www-form-urlencoded` or `multipart/form-data`.
    If a value is explicitly defined,
    then the value of [`contentType`](#encodingContentType) (implicit or explicit) SHALL be ignored.
    """

    allowReserved: bool = False
    """
    Determines whether the parameter value SHOULD allow reserved characters,
    as defined by [RFC3986](https://tools.ietf.org/html/rfc3986#section-2.2)
    `:/?#[]@!$&'()*+,;=` to be included without percent-encoding.
    The default value is `false`.
    This property SHALL be ignored if the request body media type
    is not `application/x-www-form-urlencoded` or `multipart/form-data`.
    If a value is explicitly defined,
    then the value of [`contentType`](#encodingContentType) (implicit or explicit) SHALL be ignored.
    """

    class Config:
        extra = Extra.ignore
        schema_extra = {
            "examples": [
                {
                    "contentType": "image/png, image/jpeg",
                    "headers": {
                        "X-Rate-Limit-Limit": {
                            "description": "The number of allowed requests in the current period",
                            "schema": {"type": "integer"},
                        }
                    },
                }
            ]
        }
