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

from fastapi import APIRouter, HTTPException, Query, Request, WebSocket, WebSocketDisconnect
from pydantic import BaseModel, Field

from app.core.auth_service import AuthService
from app.core.config import settings
from app.core.database import execute_query, execute_query_single

from .mission_service import MissionService
from .mission_ws import mission_ws_manager

logger = logging.getLogger(__name__)
router = APIRouter()


class MissionCallEvent(BaseModel):
    call_id: str = Field(..., min_length=1, max_length=128)
    caller_number: Optional[str] = None
    queue_name: Optional[str] = None
    timestamp: Optional[datetime] = None


class MissionUptimeWebhook(BaseModel):
    status: Optional[str] = None
    service_name: Optional[str] = None
    customer_name: Optional[str] = None
    timestamp: Optional[datetime] = None
    payload: Dict[str, Any] = Field(default_factory=dict)


def _first_query_param(request: Request, *names: str) -> Optional[str]:
    for name in names:
        value = request.query_params.get(name)
        if value and str(value).strip():
            return str(value).strip()
    return None


def _parse_query_timestamp(request: Request) -> Optional[datetime]:
    raw = _first_query_param(request, "timestamp", "time", "event_time")
    if not raw:
        return None
    try:
        return datetime.fromisoformat(raw.replace("Z", "+00:00"))
    except Exception:
        return None


def _event_from_query(request: Request) -> MissionCallEvent:
    call_id = _first_query_param(request, "call_id", "callid", "id", "session_id", "uuid")
    if not call_id:
        raise HTTPException(status_code=400, detail="Missing call_id query parameter")

    return MissionCallEvent(
        call_id=call_id,
        caller_number=_first_query_param(request, "caller_number", "caller", "from", "number", "phone"),
        queue_name=_first_query_param(request, "queue_name", "queue", "group", "line"),
        timestamp=_parse_query_timestamp(request),
    )


def _get_webhook_token() -> str:
    db_token = MissionService.get_setting_value("mission_webhook_token", "") or ""
    env_token = (getattr(settings, "MISSION_WEBHOOK_TOKEN", "") or "").strip()
    return db_token.strip() or env_token


def _validate_mission_webhook_token(request: Request, token: Optional[str] = None) -> None:
    configured = _get_webhook_token()
    if not configured:
        logger.warning("Mission webhook token not configured for path=%s", request.url.path)
        raise HTTPException(status_code=403, detail="Mission webhook token not configured")

    candidate = token or request.headers.get("x-mission-token") or request.query_params.get("token")
    if not candidate or candidate.strip() != configured:
        logger.warning("Mission webhook forbidden for path=%s", request.url.path)
        raise HTTPException(status_code=403, detail="Forbidden")


def _normalize_uptime_payload(payload: MissionUptimeWebhook) -> Dict[str, Any]:
    raw = dict(payload.payload or {})

    status_candidate = payload.status or raw.get("status") or raw.get("event")
    if not status_candidate and isinstance(raw.get("monitor"), dict):
        status_candidate = raw.get("monitor", {}).get("status")

    service_name = payload.service_name or raw.get("service_name") or raw.get("monitor_name")
    if not service_name and isinstance(raw.get("monitor"), dict):
        service_name = raw.get("monitor", {}).get("name")

    customer_name = payload.customer_name or raw.get("customer_name") or raw.get("customer")
    timestamp = payload.timestamp or raw.get("timestamp")

    status = str(status_candidate or "UNKNOWN").upper().strip()
    if status not in {"UP", "DOWN", "DEGRADED"}:
        status = "UNKNOWN"

    return {
        "status": status,
        "service_name": str(service_name or "Unknown Service"),
        "customer_name": str(customer_name or "").strip() or None,
        "timestamp": timestamp,
        "raw": raw,
    }


@router.get("/mission/state")
async def get_mission_state():
    return MissionService.get_state()


@router.websocket("/mission/ws")
async def mission_ws(websocket: WebSocket):
    token = websocket.query_params.get("token")
    auth_header = (websocket.headers.get("authorization") or "").strip()
    if not token and auth_header.lower().startswith("bearer "):
        token = auth_header.split(" ", 1)[1].strip()
    if not token:
        token = (websocket.cookies.get("access_token") or "").strip() or None

    payload = AuthService.verify_token(token) if token else None
    if not payload:
        await websocket.close(code=1008)
        return

    await mission_ws_manager.connect(websocket)
    try:
        await mission_ws_manager.broadcast("mission_state", MissionService.get_state())
        while True:
            await websocket.receive_text()
    except WebSocketDisconnect:
        await mission_ws_manager.disconnect(websocket)
    except Exception:
        await mission_ws_manager.disconnect(websocket)


@router.post("/mission/webhook/telefoni/ringing")
async def mission_telefoni_ringing(event: MissionCallEvent, request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    logger.info(
        "☎️ Mission webhook ringing call_id=%s caller=%s queue=%s method=%s",
        event.call_id,
        event.caller_number,
        event.queue_name,
        request.method,
    )

    timestamp = event.timestamp or datetime.utcnow()
    context = MissionService.resolve_contact_context(event.caller_number)
    queue_name = (event.queue_name or "Ukendt kø").strip()

    execute_query(
        """
        INSERT INTO mission_call_state (
            call_id, queue_name, caller_number, contact_name, company_name, customer_tag,
            state, started_at, answered_at, ended_at, updated_at, last_payload
        )
        VALUES (%s, %s, %s, %s, %s, %s, 'ringing', %s, NULL, NULL, NOW(), %s::jsonb)
        ON CONFLICT (call_id)
        DO UPDATE SET
            queue_name = EXCLUDED.queue_name,
            caller_number = EXCLUDED.caller_number,
            contact_name = EXCLUDED.contact_name,
            company_name = EXCLUDED.company_name,
            customer_tag = EXCLUDED.customer_tag,
            state = 'ringing',
            ended_at = NULL,
            answered_at = NULL,
            started_at = LEAST(mission_call_state.started_at, EXCLUDED.started_at),
            updated_at = NOW(),
            last_payload = EXCLUDED.last_payload
        """,
        (
            event.call_id,
            queue_name,
            event.caller_number,
            context.get("contact_name"),
            context.get("company_name"),
            context.get("customer_tag"),
            timestamp,
            json.dumps(event.model_dump(mode="json")),
        ),
    )

    event_row = MissionService.insert_event(
        event_type="incoming_call",
        title=f"Indgående opkald i {queue_name}",
        severity="warning",
        source="telefoni",
        customer_name=context.get("company_name"),
        payload={
            "call_id": event.call_id,
            "queue_name": queue_name,
            "caller_number": event.caller_number,
            **context,
        },
    )

    call_payload = {
        "call_id": event.call_id,
        "queue_name": queue_name,
        "caller_number": event.caller_number,
        **context,
        "timestamp": timestamp,
    }

    await mission_ws_manager.broadcast("call_ringing", call_payload)
    await mission_ws_manager.broadcast("live_feed_event", event_row)
    await mission_ws_manager.broadcast("kpi_update", MissionService.get_kpis())

    return {"status": "ok"}


@router.get("/mission/webhook/telefoni/ringing")
async def mission_telefoni_ringing_get(request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    # Allow token-only GET calls (no call payload) for phone webhook validation/ping.
    if not _first_query_param(request, "call_id", "callid", "id", "session_id", "uuid"):
        logger.info("☎️ Mission webhook ringing ping method=%s", request.method)
        return {"status": "ok", "mode": "ping"}

    event = _event_from_query(request)
    return await mission_telefoni_ringing(event, request, token)


@router.post("/mission/webhook/telefoni/answered")
async def mission_telefoni_answered(event: MissionCallEvent, request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    logger.info(
        "✅ Mission webhook answered call_id=%s caller=%s queue=%s method=%s",
        event.call_id,
        event.caller_number,
        event.queue_name,
        request.method,
    )

    execute_query(
        """
        UPDATE mission_call_state
        SET state = 'answered',
            answered_at = COALESCE(answered_at, NOW()),
            updated_at = NOW(),
            last_payload = %s::jsonb
        WHERE call_id = %s
        """,
        (json.dumps(event.model_dump(mode="json")), event.call_id),
    )

    event_row = MissionService.insert_event(
        event_type="call_answered",
        title="Opkald besvaret",
        severity="info",
        source="telefoni",
        payload={"call_id": event.call_id, "queue_name": event.queue_name, "caller_number": event.caller_number},
    )

    await mission_ws_manager.broadcast("call_answered", {"call_id": event.call_id})
    await mission_ws_manager.broadcast("live_feed_event", event_row)
    return {"status": "ok"}


@router.get("/mission/webhook/telefoni/answered")
async def mission_telefoni_answered_get(request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    if not _first_query_param(request, "call_id", "callid", "id", "session_id", "uuid"):
        logger.info("✅ Mission webhook answered ping method=%s", request.method)
        return {"status": "ok", "mode": "ping"}

    event = _event_from_query(request)
    return await mission_telefoni_answered(event, request, token)


@router.post("/mission/webhook/telefoni/hangup")
async def mission_telefoni_hangup(event: MissionCallEvent, request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    logger.info(
        "📴 Mission webhook hangup call_id=%s caller=%s queue=%s method=%s",
        event.call_id,
        event.caller_number,
        event.queue_name,
        request.method,
    )

    execute_query(
        """
        UPDATE mission_call_state
        SET state = 'hangup',
            ended_at = NOW(),
            updated_at = NOW(),
            last_payload = %s::jsonb
        WHERE call_id = %s
        """,
        (json.dumps(event.model_dump(mode="json")), event.call_id),
    )

    event_row = MissionService.insert_event(
        event_type="call_ended",
        title="Opkald afsluttet",
        severity="info",
        source="telefoni",
        payload={"call_id": event.call_id, "queue_name": event.queue_name, "caller_number": event.caller_number},
    )

    await mission_ws_manager.broadcast("call_hangup", {"call_id": event.call_id})
    await mission_ws_manager.broadcast("live_feed_event", event_row)
    return {"status": "ok"}


@router.get("/mission/webhook/telefoni/hangup")
async def mission_telefoni_hangup_get(request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    if not _first_query_param(request, "call_id", "callid", "id", "session_id", "uuid"):
        logger.info("📴 Mission webhook hangup ping method=%s", request.method)
        return {"status": "ok", "mode": "ping"}

    event = _event_from_query(request)
    return await mission_telefoni_hangup(event, request, token)


@router.post("/mission/webhook/uptime")
async def mission_uptime_webhook(payload: MissionUptimeWebhook, request: Request, token: Optional[str] = Query(None)):
    _validate_mission_webhook_token(request, token)

    normalized = _normalize_uptime_payload(payload)
    status = normalized["status"]
    service_name = normalized["service_name"]
    customer_name = normalized["customer_name"]
    alert_key = MissionService.build_alert_key(service_name, customer_name)

    current = execute_query_single("SELECT is_active, started_at FROM mission_uptime_alerts WHERE alert_key = %s", (alert_key,))

    if status in {"DOWN", "DEGRADED"}:
        started_at = (current or {}).get("started_at")
        is_active = bool((current or {}).get("is_active"))
        if not started_at or not is_active:
            started_at = datetime.utcnow()

        execute_query(
            """
            INSERT INTO mission_uptime_alerts (
                alert_key, service_name, customer_name, status, is_active, started_at, resolved_at,
                updated_at, raw_payload, normalized_payload
            )
            VALUES (%s, %s, %s, %s, TRUE, %s, NULL, NOW(), %s::jsonb, %s::jsonb)
            ON CONFLICT (alert_key)
            DO UPDATE SET
                status = EXCLUDED.status,
                is_active = TRUE,
                started_at = COALESCE(mission_uptime_alerts.started_at, EXCLUDED.started_at),
                resolved_at = NULL,
                updated_at = NOW(),
                raw_payload = EXCLUDED.raw_payload,
                normalized_payload = EXCLUDED.normalized_payload
            """,
            (
                alert_key,
                service_name,
                customer_name,
                status,
                started_at,
                json.dumps(payload.model_dump(mode="json")),
                json.dumps(normalized, default=str),
            ),
        )

        event_type = "uptime_down" if status == "DOWN" else "uptime_degraded"
        severity = "critical" if status == "DOWN" else "warning"
        title = f"{service_name} er {status}"
    elif status == "UP":
        execute_query(
            """
            INSERT INTO mission_uptime_alerts (
                alert_key, service_name, customer_name, status, is_active, started_at, resolved_at,
                updated_at, raw_payload, normalized_payload
            )
            VALUES (%s, %s, %s, %s, FALSE, NULL, NOW(), NOW(), %s::jsonb, %s::jsonb)
            ON CONFLICT (alert_key)
            DO UPDATE SET
                status = EXCLUDED.status,
                is_active = FALSE,
                resolved_at = NOW(),
                updated_at = NOW(),
                raw_payload = EXCLUDED.raw_payload,
                normalized_payload = EXCLUDED.normalized_payload
            """,
            (
                alert_key,
                service_name,
                customer_name,
                status,
                json.dumps(payload.model_dump(mode="json")),
                json.dumps(normalized, default=str),
            ),
        )

        event_type = "uptime_up"
        severity = "success"
        title = f"{service_name} er UP"
    else:
        event_type = "uptime_unknown"
        severity = "info"
        title = f"{service_name} status ukendt"

    event_row = MissionService.insert_event(
        event_type=event_type,
        title=title,
        severity=severity,
        source="uptime",
        customer_name=customer_name,
        payload={"alert_key": alert_key, **normalized},
    )

    await mission_ws_manager.broadcast(
        "uptime_alert",
        {
            "alert_key": alert_key,
            "status": status,
            "service_name": service_name,
            "customer_name": customer_name,
            "active_alerts": MissionService.get_active_alerts(),
        },
    )
    await mission_ws_manager.broadcast("live_feed_event", event_row)

    return {"status": "ok", "normalized": normalized}