# -*- coding: utf-8 -*-
#
# Copyright (C) 2020 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from pydantic import BaseModel, Field, validator
from typing import List, Optional, Union
from uuid import UUID, uuid4
from enum import Enum

from .nodes import NodeType
from .base import DateTimeModelMixin


class Protocol(str, Enum):
    """
    Protocol supported to communicate with a compute.
    """

    http = "http"
    https = "https"


class ComputeBase(BaseModel):
    """
    Data to create a compute.
    """

    protocol: Protocol
    host: str
    port: int = Field(..., gt=0, le=65535)
    user: Optional[str] = None
    name: Optional[str] = None


class ComputeCreate(ComputeBase):
    """
    Data to create a compute.
    """

    compute_id: Union[str, UUID] = Field(default_factory=uuid4)
    password: Optional[str] = None

    class Config:
        schema_extra = {
            "example": {
                "name": "My compute",
                "host": "127.0.0.1",
                "port": 3080,
                "user": "user",
                "password": "password"
            }
        }

    @validator("name", always=True)
    def generate_name(cls, name, values):

        if name is not None:
            return name
        else:
            protocol = values.get("protocol")
            host = values.get("host")
            port = values.get("port")
            user = values.get("user")
            if user:
                # due to random user generated by 1.4 it's common to have a very long user
                if len(user) > 14:
                    user = user[:11] + "..."
                return "{}://{}@{}:{}".format(protocol, user, host, port)
            else:
                return "{}://{}:{}".format(protocol, host, port)


class ComputeUpdate(ComputeBase):
    """
    Data to update a compute.
    """

    protocol: Optional[Protocol] = None
    host: Optional[str] = None
    port: Optional[int] = Field(None, gt=0, le=65535)
    password: Optional[str] = None

    class Config:
        schema_extra = {
            "example": {
                "host": "10.0.0.1",
                "port": 8080,
            }
        }


class Capabilities(BaseModel):
    """
    Capabilities supported by a compute.
    """

    version: str = Field(..., description="Compute version number")
    node_types: List[NodeType] = Field(..., description="Node types supported by the compute")
    platform: str = Field(..., description="Platform where the compute is running (Linux, Windows or macOS)")
    cpus: int = Field(..., description="Number of CPUs on this compute")
    memory: int = Field(..., description="Amount of memory on this compute")
    disk_size: int = Field(..., description="Disk size on this compute")


class Compute(DateTimeModelMixin, ComputeBase):
    """
    Data returned for a compute.
    """

    compute_id: Union[str, UUID]
    name: str
    connected: Optional[bool] = Field(None, description="Whether the controller is connected to the compute or not")
    cpu_usage_percent: Optional[float] = Field(None, description="CPU usage of the compute", ge=0, le=100)
    memory_usage_percent: Optional[float] = Field(None, description="Memory usage of the compute", ge=0, le=100)
    disk_usage_percent: Optional[float] = Field(None, description="Disk usage of the compute", ge=0, le=100)
    last_error: Optional[str] = Field(None, description="Last error found on the compute")
    capabilities: Optional[Capabilities] = None

    class Config:
        orm_mode = True


class AutoIdlePC(BaseModel):
    """
    Data for auto Idle-PC request.
    """

    platform: str = Field(..., description="Cisco platform")
    image: str = Field(..., description="Image path")
    ram: int = Field(..., description="Amount of RAM in MB")

    class Config:
        schema_extra = {
            "example": {
                "platform": "c7200",
                "image": "/path/to/c7200_image.bin",
                "ram": 256
            }
        }