# Copyright (c) 2025 Patrick Motsch
# All rights reserved.
"""
Teamsbot Service — WebSocket handler & audio chunk processing.

Extracted from service.py. All functions accept `service` (a TeamsbotService
instance) as the first parameter so the class can delegate to them.
"""

import logging
import json
import asyncio
import time
import base64
from typing import Optional, Dict, Any

from fastapi import WebSocket

from modules.shared.timeUtils import getUtcTimestamp

logger = logging.getLogger(__name__)


async def handleBotWebSocket(service, websocket: WebSocket, sessionId: str):
    """Main WebSocket handler for Browser Bot communication."""
    from . import interfaceFeatureTeamsbot as interfaceDb
    from modules.interfaces.interfaceVoiceObjects import getVoiceInterface
    from .service import _activeServices, _emitSessionEvent, sessionEvents
    from .serviceConversation import _processTranscript, _warmEphemeralPhrasePool

    interface = interfaceDb.getInterface(service.currentUser, service.mandateId, service.instanceId)
    voiceInterface = getVoiceInterface(service.currentUser, service.mandateId)

    session = interface.getSession(sessionId)
    if session:
        rawContext = session.get("sessionContext")
        if rawContext and len(rawContext) > 500:
            logger.info(f"Session {sessionId}: Summarizing long session context ({len(rawContext)} chars)...")
            service._sessionContext = await service._summarizeSessionContext(sessionId, rawContext)
        elif rawContext:
            service._sessionContext = rawContext
        if service._sessionContext:
            logger.info(f"Session {sessionId}: Session context ready ({len(service._sessionContext)} chars)")

    try:
        systemBot = interface.getActiveSystemBot(service.mandateId)
        service._botAccountEmail = systemBot.get("email") if systemBot else None
        if service._botAccountEmail:
            logger.info(f"Session {sessionId}: Bot account email resolved: {service._botAccountEmail}")
    except Exception:
        service._botAccountEmail = None

    service._activeSessionId = sessionId
    service._websocket = websocket
    service._voiceInterface = voiceInterface
    _activeServices[sessionId] = service

    try:
        await _emitSessionEvent(sessionId, "botConnectionState", {
            "connected": True,
            "timestamp": getUtcTimestamp(),
        })
    except Exception:
        pass

    try:
        service._activePersistentPrompts = interface.getActivePersistentPrompts(sessionId) or []
        if service._activePersistentPrompts:
            logger.info(
                f"Session {sessionId}: Loaded {len(service._activePersistentPrompts)} active persistent director prompt(s)"
            )
    except Exception as restoreErr:
        logger.warning(f"Session {sessionId}: Could not restore persistent director prompts: {restoreErr}")
        service._activePersistentPrompts = []

    asyncio.create_task(_warmEphemeralPhrasePool(service, sessionId))

    logger.info(f"[WS] Handler started for session {sessionId}")

    try:
        msgCount = 0
        while True:
            data = await websocket.receive()
            msgCount += 1

            if "text" not in data:
                logger.debug(f"[WS] session={sessionId} msg #{msgCount}: non-text data (keys: {list(data.keys())})")
                continue

            message = json.loads(data["text"])
            msgType = message.get("type")
            if msgType not in ("audioChunk", "ping"):
                logger.info(f"[WS] session={sessionId} msg #{msgCount}: type={msgType}")

            if msgType == "transcript":
                transcript = message.get("transcript", {})
                source = transcript.get("source", "caption")
                speaker = transcript.get("speaker", "Unknown")
                textPreview = (transcript.get("text", "") or "")[:60]
                logger.info(f"[WS] Transcript (source={source}, speaker={speaker}): {textPreview}...")
                await _processTranscript(
                    service,
                    sessionId=sessionId,
                    speaker=transcript.get("speaker", "Unknown"),
                    text=transcript.get("text", ""),
                    isFinal=transcript.get("isFinal", True),
                    interface=interface,
                    voiceInterface=voiceInterface,
                    websocket=websocket,
                    source=source,
                )

            elif msgType == "chatMessage":
                chat = message.get("chat", {})
                isHistory = chat.get("isHistory", False)
                source = "chatHistory" if isHistory else "chat"
                logger.info(
                    f"[WS] Chat{'[HISTORY]' if isHistory else ''}: "
                    f"speaker={chat.get('speaker')}, text={chat.get('text', '')[:60]}..."
                )
                await _processTranscript(
                    service,
                    sessionId=sessionId,
                    speaker=chat.get("speaker", "Unknown"),
                    text=chat.get("text", ""),
                    isFinal=True,
                    interface=interface,
                    voiceInterface=voiceInterface,
                    websocket=websocket,
                    source=source,
                )

            elif msgType == "status":
                status = message.get("status")
                errorMessage = message.get("message")
                logger.info(f"[WS] Status: status={status}, message={errorMessage}")
                await _handleBotStatus(service, sessionId, status, errorMessage, interface)

            elif msgType == "audioChunk":
                audioData = message.get("audio", {})
                audioBase64 = audioData.get("data", "")
                sampleRate = audioData.get("sampleRate", 16000)
                captureDiagnostics = audioData.get("captureDiagnostics") or {}
                if audioBase64:
                    await _processAudioChunk(
                        service,
                        sessionId=sessionId,
                        audioBase64=audioBase64,
                        sampleRate=sampleRate,
                        captureDiagnostics=captureDiagnostics,
                        interface=interface,
                        voiceInterface=voiceInterface,
                        websocket=websocket,
                    )

            elif msgType == "voiceGreeting":
                greetingText = message.get("text", "")
                greetingLang = message.get("language", service.config.language)
                logger.info(
                    f"[WS] Voice greeting (legacy): text={greetingText[:60]}..., language={greetingLang}"
                )
                if greetingText and voiceInterface:
                    await service._dispatchGreetingToMeeting(
                        sessionId=sessionId,
                        greetingText=greetingText,
                        greetingLang=greetingLang,
                        sendToChat=False,
                        interface=interface,
                        voiceInterface=voiceInterface,
                        websocket=websocket,
                    )

            elif msgType == "requestGreeting":
                requestedLang = (
                    message.get("language") or service.config.language or ""
                ).strip() or "en-US"
                botNameHint = (
                    message.get("botName") or service.config.botName or ""
                ).strip() or service.config.botName
                logger.info(
                    f"[WS] Greeting request from bot: language={requestedLang}, name={botNameHint}"
                )
                if voiceInterface:
                    try:
                        greetingText = await service._generateGreetingText(
                            requestedLang
                        )
                    except Exception as genErr:
                        logger.warning(
                            f"Greeting generation failed for session {sessionId}: {genErr}"
                        )
                        greetingText = ""
                    if greetingText:
                        await service._dispatchGreetingToMeeting(
                            sessionId=sessionId,
                            greetingText=greetingText,
                            greetingLang=requestedLang,
                            sendToChat=True,
                            interface=interface,
                            voiceInterface=voiceInterface,
                            websocket=websocket,
                        )
                    else:
                        logger.warning(
                            f"Session {sessionId}: Skipping greeting — AI generation produced no text"
                        )

            elif msgType == "ping":
                await websocket.send_text(json.dumps({"type": "pong"}))

            elif msgType == "ttsPlaybackAck":
                playback = message.get("playback", {}) or {}
                status = playback.get("status", "unknown")
                ackMessage = playback.get("message") or "Bot playback status update"
                logger.info(
                    f"[WS] TTS playback ack: status={status}, format={playback.get('format')}, "
                    f"bytesBase64={playback.get('bytesBase64')}"
                )
                await _emitSessionEvent(sessionId, "ttsDeliveryStatus", {
                    "status": f"playback_{status}",
                    "hasWebSocket": True,
                    "message": ackMessage,
                    "timestamp": playback.get("timestamp") or getUtcTimestamp(),
                    "format": playback.get("format"),
                    "bytesBase64": playback.get("bytesBase64"),
                })

            elif msgType == "mfaChallenge":
                mfaData = message.get("mfa", {})
                mfaType = mfaData.get("type", "unknown")
                displayNumber = mfaData.get("displayNumber")
                prompt = mfaData.get("prompt", "")
                logger.info(f"[WS] MFA challenge: type={mfaType}, number={displayNumber}, prompt={prompt[:60]}")

                await _emitSessionEvent(sessionId, "mfaChallenge", {
                    "mfaType": mfaType,
                    "displayNumber": displayNumber,
                    "prompt": prompt,
                    "timestamp": getUtcTimestamp(),
                })

                from .routeFeatureTeamsbot import mfaCodeQueues, mfaWaitTasks
                mfaQueue = asyncio.Queue()
                mfaCodeQueues[sessionId] = mfaQueue

                mfaWaitTasks[sessionId] = asyncio.create_task(
                    _waitAndForwardMfa(sessionId, mfaQueue, websocket)
                )

            elif msgType == "chatSendFailed":
                errorData = message.get("error", {})
                reason = errorData.get("reason", "unknown")
                failedText = errorData.get("text", "")
                logger.warning(
                    f"[WS] Chat send failed for session {sessionId}: "
                    f"reason={reason}, text={failedText[:60]}"
                )
                await _emitSessionEvent(sessionId, "chatSendFailed", {
                    "reason": reason,
                    "message": errorData.get("message", "Chat message could not be sent"),
                    "text": failedText,
                    "timestamp": getUtcTimestamp(),
                })

            elif msgType == "mfaResolved":
                success = message.get("success", False)
                logger.info(f"[WS] MFA resolved: success={success}")
                from .routeFeatureTeamsbot import mfaCodeQueues, mfaWaitTasks
                task = mfaWaitTasks.pop(sessionId, None)
                if task and not task.done():
                    task.cancel()
                mfaCodeQueues.pop(sessionId, None)
                await _emitSessionEvent(sessionId, "mfaResolved", {
                    "success": success,
                    "timestamp": getUtcTimestamp(),
                })

    except Exception as e:
        if "disconnect" not in str(e).lower():
            logger.error(f"[WS] Error for session {sessionId}: {type(e).__name__}: {e}")
    finally:
        if _activeServices.get(sessionId) is service:
            _activeServices.pop(sessionId, None)
        service._websocket = None
        service._voiceInterface = None
        service._activeSessionId = None
        try:
            await _emitSessionEvent(sessionId, "botConnectionState", {
                "connected": False,
                "timestamp": getUtcTimestamp(),
            })
        except Exception:
            pass

    logger.info(f"[WS] Handler ended for session {sessionId} after {msgCount} messages")


async def _waitAndForwardMfa(sid: str, queue: asyncio.Queue, ws: WebSocket):
    """Wait for an MFA code from the operator and forward it to the bot."""
    from .service import _emitSessionEvent
    from .routeFeatureTeamsbot import mfaCodeQueues, mfaWaitTasks

    try:
        mfaResponse = await asyncio.wait_for(queue.get(), timeout=120.0)
        logger.info(f"[WS] MFA response received for session {sid}: action={mfaResponse.get('action')}")
        await ws.send_text(json.dumps({
            "type": "mfaResponse",
            "sessionId": sid,
            "mfa": mfaResponse,
        }))
    except asyncio.TimeoutError:
        logger.warning(f"[WS] MFA response timeout for session {sid}")
        await ws.send_text(json.dumps({
            "type": "mfaResponse",
            "sessionId": sid,
            "mfa": {"action": "timeout"},
        }))
        await _emitSessionEvent(sid, "mfaChallenge", {
            "mfaType": "timeout",
            "prompt": "MFA-Zeitlimit ueberschritten. Bitte erneut versuchen.",
        })
    except asyncio.CancelledError:
        logger.info(f"[WS] MFA wait cancelled for session {sid} (resolved via page)")
    finally:
        mfaCodeQueues.pop(sid, None)
        mfaWaitTasks.pop(sid, None)


async def _handleBotStatus(
    service,
    sessionId: str,
    status: str,
    errorMessage: Optional[str],
    interface,
):
    """Handle status updates from the browser bot."""
    from .service import _emitSessionEvent
    from .datamodelTeamsbot import TeamsbotSessionStatus

    logger.info(f"Bot status update for session {sessionId}: {status}")

    statusMap = {
        "connecting": TeamsbotSessionStatus.JOINING.value,
        "launching": TeamsbotSessionStatus.JOINING.value,
        "navigating": TeamsbotSessionStatus.JOINING.value,
        "in_lobby": TeamsbotSessionStatus.JOINING.value,
        "joined": TeamsbotSessionStatus.ACTIVE.value,
        "in_meeting": TeamsbotSessionStatus.ACTIVE.value,
        "left": TeamsbotSessionStatus.ENDED.value,
        "error": TeamsbotSessionStatus.ERROR.value,
    }

    dbStatus = statusMap.get(status, TeamsbotSessionStatus.ACTIVE.value)

    updates = {"status": dbStatus}
    if errorMessage:
        updates["errorMessage"] = errorMessage
    if dbStatus == TeamsbotSessionStatus.ACTIVE.value:
        updates["startedAt"] = getUtcTimestamp()
    elif dbStatus in [TeamsbotSessionStatus.ENDED.value, TeamsbotSessionStatus.ERROR.value]:
        updates["endedAt"] = getUtcTimestamp()

    interface.updateSession(sessionId, updates)
    await _emitSessionEvent(sessionId, "statusChange", {"status": status, "errorMessage": errorMessage})

    if dbStatus in [TeamsbotSessionStatus.ENDED.value, TeamsbotSessionStatus.ERROR.value]:
        if service._audioBuffer:
            logger.info(f"[AudioChunk] Flushing remaining buffer on session end ({len(service._audioBuffer)} bytes)")
            service._audioBuffer = b""
            service._audioBufferStartTime = 0.0
            service._audioBufferLastChunkTime = 0.0

    if dbStatus == TeamsbotSessionStatus.ENDED.value:
        asyncio.create_task(service._generateMeetingSummary(sessionId))


async def _processAudioChunk(
    service,
    sessionId: str,
    audioBase64: str,
    sampleRate: int,
    captureDiagnostics: Optional[Dict[str, Any]],
    interface,
    voiceInterface,
    websocket: WebSocket,
):
    """Process an audio chunk from WebRTC capture."""
    from .serviceConversation import _processTranscript

    _MIN_CHUNK_SEC = 1.0
    _STALE_TIMEOUT_SEC = 3.0

    try:
        audioBytes = base64.b64decode(audioBase64)
        if len(audioBytes) < 500:
            return

        if captureDiagnostics:
            trackId = captureDiagnostics.get("trackId")
            readyState = captureDiagnostics.get("readyState")
            rms = captureDiagnostics.get("rms")
            nativeSampleRate = captureDiagnostics.get("nativeSampleRate")
            logger.debug(
                f"[AudioChunk] diagnostics: track={trackId}, readyState={readyState}, "
                f"rms={rms}, nativeRate={nativeSampleRate}, bytes={len(audioBytes)}"
            )

        isSilent = False
        if captureDiagnostics and captureDiagnostics.get("rms") is not None:
            try:
                rmsVal = float(captureDiagnostics.get("rms"))
                if rmsVal < 0.0003:
                    isSilent = True
            except Exception:
                pass

        if not voiceInterface:
            logger.warning(f"[AudioChunk] No voice interface available for session {sessionId}")
            return

        now = time.time()
        effectiveRate = sampleRate if sampleRate and sampleRate > 0 else 16000

        if not isSilent:
            if not service._audioBuffer:
                service._audioBufferStartTime = now
            service._audioBuffer += audioBytes
            service._audioBufferLastChunkTime = now
            service._audioBufferSampleRate = effectiveRate

        bufferDuration = len(service._audioBuffer) / (effectiveRate * 2) if service._audioBuffer else 0.0
        bufferAge = (now - service._audioBufferStartTime) if service._audioBuffer else 0.0

        shouldFlush = (
            service._audioBuffer
            and (
                bufferDuration >= _MIN_CHUNK_SEC
                or (bufferAge >= _STALE_TIMEOUT_SEC and bufferDuration > 0.3)
            )
        )

        if not shouldFlush:
            return

        flushBytes = service._audioBuffer
        flushRate = service._audioBufferSampleRate
        service._audioBuffer = b""
        service._audioBufferStartTime = 0.0
        service._audioBufferLastChunkTime = 0.0

        flushDuration = len(flushBytes) / (flushRate * 2)
        logger.info(f"[AudioChunk] Flushing buffer: {len(flushBytes)} bytes, {flushDuration:.1f}s, {flushRate}Hz")

        phraseHints = list(service._knownSpeakers)
        if service.config.botName:
            phraseHints.append(service.config.botName)

        sttResult = await voiceInterface.speechToText(
            audioContent=flushBytes,
            language=service.config.language or "de-DE",
            sampleRate=flushRate,
            channels=1,
            skipFallbacks=True,
            phraseHints=phraseHints if phraseHints else None,
            audioFormat="linear16",
        )

        if sttResult and sttResult.get("success") and sttResult.get("text"):
            text = sttResult["text"].strip()
            if text:
                resolvedSpeaker = service._resolveSpeakerForAudioCapture()
                fromCaption = resolvedSpeaker.get("speakerResolvedFromHint", False)
                logger.info(
                    f"[AudioChunk] STT result: speaker={resolvedSpeaker.get('speaker', 'Meeting Audio')} "
                    f"(fromCaption={fromCaption}), text={text[:80]}..."
                )
                await _processTranscript(
                    service,
                    sessionId=sessionId,
                    speaker=resolvedSpeaker["speaker"],
                    text=text,
                    isFinal=True,
                    interface=interface,
                    voiceInterface=voiceInterface,
                    websocket=websocket,
                    source="audioCapture",
                    speakerResolvedFromHint=resolvedSpeaker["speakerResolvedFromHint"],
                )
    except Exception as e:
        logger.error(f"[AudioChunk] STT error for session {sessionId}: {type(e).__name__}: {e}")


async def _cancelInFlightSpeech(
    service,
    sessionId: str,
    websocket: Optional[WebSocket],
    reason: str,
) -> None:
    """Hard stop everything the bot is currently doing in the meeting."""
    from .service import _emitSessionEvent

    service._answerGenerationCounter += 1
    gen = service._answerGenerationCounter
    logger.info(
        f"Session {sessionId}: Cancelling in-flight speech "
        f"(reason={reason}, gen={gen})"
    )

    if service._pendingNameTrigger:
        logger.info(
            f"Session {sessionId}: Dropping pending debounced name "
            f"trigger (was queued before stop)"
        )
        service._pendingNameTrigger = None

    for taskAttr in ("_currentEscalationTask", "_currentQuickAckTask"):
        task = getattr(service, taskAttr, None)
        if task is not None and not task.done():
            logger.info(
                f"Session {sessionId}: Cancelling background task "
                f"{taskAttr}"
            )
            task.cancel()

    if websocket is not None:
        try:
            await websocket.send_text(json.dumps({
                "type": "stopAudio",
                "sessionId": sessionId,
                "reason": reason,
            }))
        except Exception as stopErr:
            logger.warning(
                f"Session {sessionId}: Failed to send stopAudio to "
                f"browser bot: {stopErr}"
            )

    try:
        await _emitSessionEvent(sessionId, "speechCancelled", {
            "reason": reason,
            "generation": gen,
            "timestamp": getUtcTimestamp(),
        })
    except Exception:
        pass