import json
from datetime import datetime
from typing import Dict, Optional

from app.models import JobStatus
from app.session_store import attach_worker, detach_worker, update_worker_heartbeat, get_session
from app.job_queue import (
    assign_job_to_worker, mark_job_running, complete_job, fail_job, get_job,
)
from app.receipts import create_receipt
from app.capabilities import register_capabilities

_worker_sockets: Dict[str, any] = {}  # key: session_id:worker_id -> WebSocket
_client_sockets: Dict[str, any] = {}  # key: session_id -> WebSocket (v1: one client per session)
_mac_node_sockets: Dict[str, any] = {}  # key: node_id -> WebSocket for Mac DMG nodes


async def connect_worker_websocket(session_id: str, worker_id: str, websocket) -> bool:
    key = f"{session_id}:{worker_id}"
    _worker_sockets[key] = websocket
    return True


async def connect_client_websocket(session_id: str, websocket) -> bool:
    _client_sockets[session_id] = websocket
    return True


async def disconnect_worker(session_id: str, worker_id: str) -> None:
    key = f"{session_id}:{worker_id}"
    _worker_sockets.pop(key, None)
    detach_worker(session_id, worker_id)


async def disconnect_client(session_id: str) -> None:
    _client_sockets.pop(session_id, None)


async def send_to_worker(session_id: str, worker_id: str, message: dict) -> bool:
    key = f"{session_id}:{worker_id}"
    ws = _worker_sockets.get(key)
    if ws:
        try:
            await ws.send_json(message)
            return True
        except Exception:
            return False
    return False


async def send_to_client(session_id: str, message: dict) -> bool:
    ws = _client_sockets.get(session_id)
    if ws:
        try:
            await ws.send_json(message)
            return True
        except Exception:
            return False
    return False


async def broadcast_session_update(session_id: str) -> None:
    session = get_session(session_id)
    if not session:
        return
    msg = {
        "op": "session_update",
        "session_id": session_id,
        "worker_count": len(session.workers),
        "job_count": len([j for j in session.workers.values()]),
    }
    await send_to_client(session_id, msg)


async def route_job_offer_to_worker(job) -> bool:
    if not job.worker_id:
        return False
    msg = {
        "op": "job_offer",
        "job_id": job.job_id,
        "job_type": job.job_type.value,
        "payload": job.payload,
        "privacy_mode": job.privacy_mode.value,
    }
    return await send_to_worker(job.session_id, job.worker_id, msg)


async def route_job_result_to_client(result) -> bool:
    job = get_job(result.job_id)
    if not job:
        return False
    msg = {
        "op": "job_result",
        "job_id": result.job_id,
        "status": "completed",
        "output": result.output,
        "latency_ms": result.latency_ms,
    }
    return await send_to_client(job.session_id, msg)


async def handle_worker_message(session_id: str, worker_id: str, message: dict) -> None:
    op = message.get("op")
    if op == "worker_hello":
        from app.models import WorkerState, WorkerRuntimeType
        runtime = WorkerRuntimeType(message.get("runtime_type", "safari_wasm"))
        worker = WorkerState(
            worker_id=worker_id,
            session_id=session_id,
            runtime_type=runtime,
            device_public_key=message.get("device_public_key"),
        )
        attach_worker(session_id, worker)
        await send_to_worker(session_id, worker_id, {"op": "worker_welcome", "worker_id": worker_id})
    elif op == "capabilities":
        register_capabilities(session_id, worker_id, message.get("capabilities", []))
        await broadcast_session_update(session_id)
    elif op == "heartbeat":
        update_worker_heartbeat(session_id, worker_id)
    elif op == "job_accept":
        mark_job_running(message.get("job_id"))
    elif op == "job_progress":
        job = get_job(message.get("job_id"))
        if job:
            await send_to_client(job.session_id, {
                "op": "job_progress",
                "job_id": message.get("job_id"),
                "progress": message.get("progress", 0.0),
            })
    elif op == "job_result":
        from app.models import JobResult
        from app.session_store import list_workers
        result = JobResult(
            job_id=message["job_id"],
            worker_id=worker_id,
            output=message.get("output", {}),
            latency_ms=message.get("latency_ms", 0),
            input_hash=message.get("input_hash"),
            output_hash=message.get("output_hash"),
            device_signature=message.get("device_signature"),
        )
        job = get_job(result.job_id)
        if job:
            complete_job(result.job_id, result)
            workers = list_workers(session_id)
            worker = next((w for w in workers if w.worker_id == worker_id), None)
            if worker:
                create_receipt(job, worker, result)
            await route_job_result_to_client(result)
    elif op == "disconnect":
        await disconnect_worker(session_id, worker_id)


async def handle_client_message(session_id: str, message: dict) -> None:
    op = message.get("op")
    if op == "client_hello":
        await send_to_client(session_id, {"op": "client_welcome", "session_id": session_id})
    elif op == "session_update":
        await broadcast_session_update(session_id)
    elif op == "chat_submit":
        # iPhone client submits a prompt; route to MacBook node if available
        from app.models import JobType, PrivacyMode
        from app.job_queue import create_job, select_worker_for_job, assign_job_to_worker

        job = create_job(
            session_id=session_id,
            job_type=JobType.CHAT_COMPLETION,
            payload={"prompt": message.get("prompt", ""), "max_tokens": message.get("max_tokens", 512), "temperature": message.get("temperature", 0.7)},
            privacy_mode=PrivacyMode.LOCAL_ONLY,
            constraints={},
        )

        # Prefer MacBook node; fallback to iPhone worker
        mac_nodes = list(_mac_node_sockets.keys())
        if mac_nodes:
            node_id = mac_nodes[0]  # Pick first available MacBook node
            assign_job_to_worker(job.job_id, node_id)
            await send_to_client(session_id, {"op": "job_assigned", "job_id": job.job_id, "worker": "MacBook"})
            await route_job_to_mac_node(job, node_id)
        else:
            # Fallback to iPhone worker scoring
            worker_id = select_worker_for_job(session_id, job)
            if worker_id:
                assign_job_to_worker(job.job_id, worker_id)
                await send_to_client(session_id, {"op": "job_assigned", "job_id": job.job_id, "worker": "iPhone"})
                await route_job_offer_to_worker(job)
            else:
                await send_to_client(session_id, {"op": "error", "error": "No compute workers available. Connect your MacBook DMG or iPhone worker."})


# Mac Node relay functions
async def connect_mac_node(node_id: str, websocket) -> bool:
    _mac_node_sockets[node_id] = websocket
    return True


async def disconnect_mac_node(node_id: str) -> None:
    _mac_node_sockets.pop(node_id, None)


async def send_to_mac_node(node_id: str, message: dict) -> bool:
    ws = _mac_node_sockets.get(node_id)
    if ws:
        try:
            await ws.send_json(message)
            return True
        except Exception:
            return False
    return False


async def broadcast_to_mac_nodes(message: dict) -> bool:
    if not _mac_node_sockets:
        return False
    sent = False
    for node_id, ws in _mac_node_sockets.items():
        try:
            await ws.send_json(message)
            sent = True
        except Exception:
            await disconnect_mac_node(node_id)
    return sent


async def route_job_to_mac_node(job, node_id: str) -> bool:
    msg = {
        "op": "inference.request",
        "job_id": job.job_id,
        "job_type": job.job_type.value,
        "payload": job.payload,
        "privacy_mode": job.privacy_mode.value,
    }
    return await send_to_mac_node(node_id, msg)


async def handle_mac_node_message(node_id: str, message: dict) -> None:
    op = message.get("op")
    if op == "node.register":
        await send_to_mac_node(node_id, {"op": "node.registered", "node_id": node_id})
    elif op == "inference.chunk":
        # Stream chunk to client
        job = get_job(message.get("job_id"))
        if job:
            await send_to_client(job.session_id, {
                "op": "job_stream",
                "job_id": message.get("job_id"),
                "chunk": message.get("chunk"),
            })
    elif op == "inference.complete":
        from app.models import JobResult
        from app.session_store import list_workers
        result = JobResult(
            job_id=message["job_id"],
            worker_id=node_id,
            output=message.get("output", {}),
            latency_ms=message.get("latency_ms", 0),
            input_hash=message.get("input_hash"),
            output_hash=message.get("output_hash"),
            device_signature=message.get("device_signature"),
        )
        job = get_job(result.job_id)
        if job:
            complete_job(result.job_id, result)
            workers = list_workers(job.session_id)
            worker = next((w for w in workers if w.worker_id == node_id), None)
            if worker:
                create_receipt(job, worker, result)
            await send_to_client(job.session_id, {
                "op": "job_complete",
                "job_id": result.job_id,
                "output": result.output,
                "latency_ms": result.latency_ms,
                "worker": "MacBook",
                "tokens": message.get("tokens_generated", 0),
                "tps": message.get("tokens_per_second", 0),
            })
            await broadcast_session_update(job.session_id)
    elif op == "node.heartbeat":
        from app.mac_relay import update_mac_heartbeat
        update_mac_heartbeat(node_id)
        # Store health metrics from heartbeat payload
        if node_id in _mac_node_meta:
            _mac_node_meta[node_id]["health"] = {
                "cpu_usage": message.get("cpu_usage", 0.0),
                "ram_used_mb": message.get("ram_used_mb", 0.0),
                "thermal_state": message.get("thermal_state", "nominal"),
                "timestamp": datetime.utcnow().isoformat(),
            }
    elif op == "disconnect":
        await disconnect_mac_node(node_id)