#
# Copyright (C) 2021 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 enum import Enum
from pydantic import BaseModel, Field, SecretStr, FilePath, DirectoryPath, validator
from typing import List


class ControllerSettings(BaseModel):

    jwt_secret_key: str = None
    jwt_algorithm: str = "HS256"
    jwt_access_token_expire_minutes: int = 1440

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class VPCSSettings(BaseModel):

    vpcs_path: str = "vpcs"

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class DynamipsSettings(BaseModel):

    allocate_aux_console_ports: bool = False
    mmap_support: bool = True
    dynamips_path: str = "dynamips"
    sparse_memory_support: bool = True
    ghost_ios_support: bool = True

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class IOUSettings(BaseModel):

    iourc_path: str = None
    license_check: bool = True

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class QemuSettings(BaseModel):

    enable_monitor: bool = True
    monitor_host: str = "127.0.0.1"
    enable_hardware_acceleration: bool = True
    require_hardware_acceleration: bool = False

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class VirtualBoxSettings(BaseModel):

    vboxmanage_path: str = None

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class VMwareSettings(BaseModel):

    vmrun_path: str = None
    vmnet_start_range: int = Field(2, ge=1, le=255)
    vmnet_end_range: int = Field(255, ge=1, le=255)  # should be limited to 19 on Windows
    block_host_traffic: bool = False

    @validator("vmnet_end_range")
    def vmnet_port_range(cls, v, values):
        if "vmnet_start_range" in values and v <= values["vmnet_start_range"]:
            raise ValueError("vmnet_end_range must be > vmnet_start_range")
        return v

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True


class ServerProtocol(str, Enum):

    http = "http"
    https = "https"


class ServerSettings(BaseModel):

    local: bool = False
    protocol: ServerProtocol = ServerProtocol.http
    host: str = "0.0.0.0"
    port: int = Field(3080, gt=0, le=65535)
    secrets_dir: DirectoryPath = None
    certfile: FilePath = None
    certkey: FilePath = None
    enable_ssl: bool = False
    images_path: str = "~/GNS3/images"
    projects_path: str = "~/GNS3/projects"
    appliances_path: str = "~/GNS3/appliances"
    symbols_path: str = "~/GNS3/symbols"
    configs_path: str = "~/GNS3/configs"
    report_errors: bool = True
    additional_images_paths: List[str] = Field(default_factory=list)
    console_start_port_range: int = Field(5000, gt=0, le=65535)
    console_end_port_range: int = Field(10000, gt=0, le=65535)
    vnc_console_start_port_range: int = Field(5900, ge=5900, le=65535)
    vnc_console_end_port_range: int = Field(10000, ge=5900, le=65535)
    udp_start_port_range: int = Field(10000, gt=0, le=65535)
    udp_end_port_range: int = Field(30000, gt=0, le=65535)
    ubridge_path: str = "ubridge"
    user: str = None
    password: SecretStr = None
    enable_http_auth: bool = False
    allowed_interfaces: List[str] = Field(default_factory=list)
    default_nat_interface: str = None
    allow_remote_console: bool = False

    @validator("additional_images_paths", pre=True)
    def split_additional_images_paths(cls, v):
        if v:
            return v.split(";")
        return list()

    @validator("allowed_interfaces", pre=True)
    def split_allowed_interfaces(cls, v):
        if v:
            return v.split(",")
        return list()

    @validator("console_end_port_range")
    def console_port_range(cls, v, values):
        if "console_start_port_range" in values and v <= values["console_start_port_range"]:
            raise ValueError("console_end_port_range must be > console_start_port_range")
        return v

    @validator("vnc_console_end_port_range")
    def vnc_console_port_range(cls, v, values):
        if "vnc_console_start_port_range" in values and v <= values["vnc_console_start_port_range"]:
            raise ValueError("vnc_console_end_port_range must be > vnc_console_start_port_range")
        return v

    @validator("enable_http_auth")
    def validate_enable_auth(cls, v, values):

        if v is True:
            if "user" not in values or not values["user"]:
                raise ValueError("HTTP authentication is enabled but user is not configured")
        return v

    @validator("enable_ssl")
    def validate_enable_ssl(cls, v, values):

        if v is True:
            if "certfile" not in values or not values["certfile"]:
                raise ValueError("SSL is enabled but certfile is not configured")
            if "certkey" not in values or not values["certkey"]:
                raise ValueError("SSL is enabled but certkey is not configured")
        return v

    class Config:
        validate_assignment = True
        anystr_strip_whitespace = True
        use_enum_values = True


class ServerConfig(BaseModel):

    Server: ServerSettings = ServerSettings()
    Controller: ControllerSettings = ControllerSettings()
    VPCS: VPCSSettings = VPCSSettings()
    Dynamips: DynamipsSettings = DynamipsSettings()
    IOU: IOUSettings = IOUSettings()
    Qemu: QemuSettings = QemuSettings()
    VirtualBox: VirtualBoxSettings = VirtualBoxSettings()
    VMware: VMwareSettings = VMwareSettings()