from __future__ import annotations

from datetime import datetime, timezone
from enum import Enum
from typing import Any, Literal

from pydantic import BaseModel, Field


def utc_now_iso() -> str:
    return datetime.now(timezone.utc).isoformat()


class Platform(str, Enum):
    windows = "windows"
    pwa = "pwa"
    web = "web"
    unknown = "unknown"


class DeviceHello(BaseModel):
    device_id: str = Field(min_length=3, max_length=128)
    platform: Platform = Platform.unknown
    version: str = "0.0.0"
    hostname: str = ""
    capabilities: list[str] = Field(default_factory=list)


class ConnectedDevice(BaseModel):
    device_id: str
    platform: Platform
    version: str
    hostname: str = ""
    capabilities: list[str] = Field(default_factory=list)
    connected_at: str = Field(default_factory=utc_now_iso)
    last_seen_at: str = Field(default_factory=utc_now_iso)


class DispatchRequest(BaseModel):
    action: Literal["notify", "wallpaper_set", "overlay_show", "sync_settings", "ping"]
    data: dict[str, Any] = Field(default_factory=dict)
    target_scope: Literal["all", "windows", "pwa", "web", "device_ids"] = "all"
    device_ids: list[str] = Field(default_factory=list)


class DispatchResult(BaseModel):
    command_id: str
    delivered_to: list[str] = Field(default_factory=list)
    skipped: list[str] = Field(default_factory=list)


class UpdateManifest(BaseModel):
    version: str = "0.0.0"
    download_url: str = ""
    sha256: str = ""
    notes: str = ""
    published_at: str = Field(default_factory=utc_now_iso)