from apispec import APISpec
from flask import Flask, jsonify
from marshmallow import Schema, fields

# Create an APISpec
spec = APISpec(
    title='Swagger Petstore',
    version='1.0.0',
    plugins=[
        'apispec.ext.flask',
        'apispec.ext.marshmallow',
    ],
)

# Optional marshmallow support
class CategorySchema(Schema):
    id = fields.Int()
    name = fields.Str(required=True)

class PetSchema(Schema):
    category = fields.Nested(CategorySchema, many=True)
    name = fields.Str()

# Optional Flask support
app = Flask(__name__)

@app.route('/random')
def random_pet():
    """A cute furry animal endpoint.
    ---
    get:
        description: Get a random pet
        responses:
            200:
                description: A pet to be returned
                schema: PetSchema
    """
    pet = get_random_pet()
    return jsonify(PetSchema().dump(pet).data)

# Register entities and paths
spec.definition('Category', schema=CategorySchema)
spec.definition('Pet', schema=PetSchema)
with app.test_request_context():
    spec.add_path(view=random_pet)

spec.to_dict()
# {
#   "info": {
#     "title": "Swagger Petstore",
#     "version": "1.0.0"
#   },
#   "swagger": "2.0",
#   "paths": {
#     "/random": {
#       "get": {
#         "description": "A cute furry animal endpoint.",
#         "responses": {
#           "200": {
#             "schema": {
#               "$ref": "#/definitions/Pet"
#             },
#             "description": "A pet to be returned"
#           }
#         },
#       }
#     }
#   },
#   "definitions": {
#     "Pet": {
#       "properties": {
#         "category": {
#           "type": "array",
#           "items": {
#             "$ref": "#/definitions/Category"
#           }
#         },
#         "name": {
#           "type": "string"
#         }
#       }
#     },
#     "Category": {
#       "required": [
#         "name"
#       ],
#       "properties": {
#         "name": {
#           "type": "string"
#         },
#         "id": {
#           "type": "integer",
#           "format": "int32"
#         }
#       }
#     }
#   },
# }

spec.to_yaml()
# definitions:
#   Pet:
#     enum: [name, photoUrls]
#     properties:
#       id: {format: int64, type: integer}
#       name: {example: doggie, type: string}
# info: {description: 'This is a sample Petstore server.  You can find out more ', title: Swagger Petstore, version: 1.0.0}
# parameters: {}
# paths: {}
# security:
# - apiKey: []
# swagger: '2.0'
# tags: []