"""MCP resources -- read-only state queries exposed as esp32:// URIs."""

from __future__ import annotations

import json

from fastmcp import FastMCP

from .serial_client import NotConnected, get_client

# Static persona catalog.  Mirrors the presets defined in the ESP32 firmware.
_PERSONAS: dict[str, dict] = {
    "headset": {
        "name": "ESP32-Headset",
        "io_cap": "no_io",
        "transport": "classic",
        "services": ["handsfree", "a2dp_sink"],
    },
    "speaker": {
        "name": "ESP32-Speaker",
        "io_cap": "no_io",
        "transport": "classic",
        "services": ["a2dp_sink"],
    },
    "keyboard": {
        "name": "ESP32-Keyboard",
        "io_cap": "keyboard_display",
        "transport": "ble",
        "services": ["hid"],
    },
    "sensor": {
        "name": "ESP32-Sensor",
        "io_cap": "no_io",
        "transport": "ble",
        "services": ["battery", "environmental_sensing"],
    },
    "phone": {
        "name": "ESP32-Phone",
        "io_cap": "display_yesno",
        "transport": "both",
        "services": ["gap", "gatt"],
    },
    "bare": {
        "name": "ESP32-BT",
        "io_cap": "no_io",
        "transport": "both",
        "services": [],
    },
}


def _event_to_dict(e) -> dict:
    return {"event": e.event, "data": e.data, "ts": e.ts}


def register_resources(mcp: FastMCP) -> None:
    @mcp.resource("esp32://status")
    async def device_status() -> str:
        """Device connection status and Bluetooth state."""
        try:
            client = get_client()
            resp = await client.send_command("get_status")
            data = {"connected": True, **resp.data}
        except NotConnected:
            data = {"connected": False}
        return json.dumps(data)

    @mcp.resource("esp32://events")
    async def recent_events() -> str:
        """Recent event history (last 50 events)."""
        try:
            client = get_client()
            events = client.event_queue.get_events(limit=50)
            data = [_event_to_dict(e) for e in events]
        except NotConnected:
            data = []
        return json.dumps(data)

    @mcp.resource("esp32://personas")
    async def available_personas() -> str:
        """Available device personas and their configurations."""
        return json.dumps(_PERSONAS)