import re
from datetime import datetime

from pydantic import BaseModel, Field, field_validator

ALLOWED_NAME_REGEX = re.compile(r"^[A-Za-z0-9_-]+$")


class RouterBase(BaseModel):
    name: str = Field(min_length=1, max_length=120)
    host: str = Field(min_length=1, max_length=255)
    port: int = Field(default=22, ge=1, le=65535)
    ssh_user: str = Field(default="admin", min_length=1, max_length=120)
    ssh_key: str | None = None
    ssh_password: str | None = None

    @field_validator("name")
    @classmethod
    def validate_name(cls, value: str) -> str:
        if not ALLOWED_NAME_REGEX.match(value):
            raise ValueError("Only letters, digits, dashes and underscores are allowed")
        return value


class RouterCreate(RouterBase):
    pass


class RouterUpdate(BaseModel):
    name: str | None = None
    host: str | None = None
    port: int | None = Field(default=None, ge=1, le=65535)
    ssh_user: str | None = None
    ssh_key: str | None = None
    ssh_password: str | None = None


class RouterResponse(RouterBase):
    id: int
    owner_id: int
    uses_global_ssh_key: bool = False
    has_effective_ssh_key: bool = False
    last_connection_status: bool | None = None
    last_connection_tested_at: datetime | None = None
    last_connection_error: str | None = None
    last_connection_hostname: str | None = None
    last_connection_model: str | None = None
    last_connection_version: str | None = None
    last_connection_uptime: str | None = None
    created_at: datetime | None = None

    model_config = {"from_attributes": True}


class RouterTestConnection(BaseModel):
    success: bool
    tested_at: datetime
    model: str
    uptime: str
    hostname: str
    version: str | None = None
    error: str | None = None