from datetime import datetime
from typing import Any, Dict, Generic, List, Literal, Optional, TypeVar

from pydantic import BaseModel, Field

T = TypeVar('T')

JobStatus = Literal['pending', 'running', 'completed', 'failed', 'cancelled']
ObjectStatus = Literal['active', 'planned', 'inactive', 'retired', 'unknown']
ObjectType = Literal[
    'site', 'area', 'rack', 'physical_host', 'vm', 'lxc', 'container',
    'app', 'switch', 'firewall', 'router', 'ap', 'camera', 'storage', 'other'
]


class HealthCheck(BaseModel):
    status: Literal['pass', 'warn', 'fail']
    latency_ms: Optional[float] = None
    detail: Optional[str] = None


class HealthResponse(BaseModel):
    status: Literal['pass', 'warn', 'fail']
    service: str
    version: Optional[str] = None
    time: datetime
    uptime_s: Optional[float] = None
    checks: Dict[str, HealthCheck] = Field(default_factory=dict)


class NetObject(BaseModel):
    id: str
    name: str
    slug: Optional[str] = None
    type: ObjectType
    parent_id: Optional[str] = None
    status: ObjectStatus
    vendor: Optional[str] = None
    model: Optional[str] = None
    serial: Optional[str] = None
    notes: Optional[str] = None
    created_at: datetime
    updated_at: datetime


class IPAddress(BaseModel):
    id: str
    address: str
    version: Literal[4, 6]
    subnet_id: Optional[str] = None
    object_id: Optional[str] = None
    interface_id: Optional[str] = None
    hostname: Optional[str] = None
    source: Literal['manual', 'snmp', 'arp', 'lldp', 'nmap', 'import', 'other']
    status: Literal['assigned', 'reserved', 'free', 'unknown'] = 'unknown'


class Subnet(BaseModel):
    id: str
    name: str
    cidr: str
    gateway: Optional[str] = None
    vlan_id: Optional[int] = None
    notes: Optional[str] = None


class Link(BaseModel):
    id: str
    source_object_id: str
    target_object_id: str
    source_interface_id: Optional[str] = None
    target_interface_id: Optional[str] = None
    type: Literal['physical', 'logical', 'hosted_on', 'member_of', 'uplink', 'other']
    confidence: float = 1.0
    source: Literal['manual', 'snmp', 'lldp', 'arp', 'import', 'inference']


class Job(BaseModel):
    id: str
    type: str
    status: JobStatus
    progress: int = 0
    message: Optional[str] = None
    error: Optional[str] = None
    payload: Optional[Dict[str, Any]] = None
    result: Optional[Dict[str, Any]] = None
    created_at: datetime
    started_at: Optional[datetime] = None
    finished_at: Optional[datetime] = None


class DiscoveryProfile(BaseModel):
    id: str
    name: str
    strategy: Literal['fast', 'balanced', 'deep', 'custom']
    use_icmp: bool = True
    use_arp: bool = True
    use_snmp: bool = False
    use_lldp: bool = False
    use_portscan: bool = False
    notes: Optional[str] = None


class DiscoveryRun(BaseModel):
    id: str
    profile_id: str
    subnet_ids: List[str] = Field(default_factory=list)
    job_id: Optional[str] = None
    status: JobStatus
    summary: Optional[Dict[str, Any]] = None
    created_at: datetime
    started_at: Optional[datetime] = None
    finished_at: Optional[datetime] = None


class ListResponse(BaseModel, Generic[T]):
    count: int
    items: List[T]
    page: Optional[int] = None
    page_size: Optional[int] = None
    total: Optional[int] = None


class EntityResponse(BaseModel, Generic[T]):
    item: T