from datetime import date
from typing import List, Optional

from fastapi import APIRouter, Depends, HTTPException, Request, status
from sqlalchemy.orm import Session

from app.api.deps import get_current_operator_user, get_current_read_user, get_db
from app.core.email import email_service
from app.core.config import settings
from app.core.frz import swansea_frz_geojson
from app.core.utils import get_client_ip
from app.crud.crud_drone_request import drone_request as crud_drone_request
from app.crud.crud_journal import journal as crud_journal
from app.models.journal import EntityType
from app.models.ppr import User
from app.schemas.drone_request import (
    DroneRequest,
    DroneRequestComment,
    DroneRequestCreate,
    DroneRequestPublicSubmission,
    DroneRequestStatus,
    DroneRequestStatusUpdate,
    DroneRequestUpdate,
)
from app.schemas.journal import JournalEntryResponse

router = APIRouter()


async def _broadcast(request: Request, event_type: str, drone_request: DroneRequest):
    if hasattr(request.app.state, "connection_manager"):
        await request.app.state.connection_manager.broadcast({
            "type": event_type,
            "data": {
                "id": drone_request.id,
                "reference_number": drone_request.reference_number,
                "status": drone_request.status.value,
            },
        })


async def _send_drone_email(drone_request, subject: str, message: str):
    await email_service.send_email(
        to_email=drone_request.email,
        subject=subject,
        template_name="drone_request_update.html",
        template_vars={
            "name": drone_request.operator_name,
            "reference_number": drone_request.reference_number,
            "status": drone_request.status.value,
            "message": message,
            "takeoff_time": drone_request.estimated_takeoff_at.strftime("%Y-%m-%d %H:%M"),
            "completion_time": drone_request.estimated_completion_at.strftime("%Y-%m-%d %H:%M"),
            "location": drone_request.location_description or f"{drone_request.location_latitude}, {drone_request.location_longitude}",
            "maximum_elevation_ft_agl": drone_request.maximum_elevation_ft_agl,
            "edit_url": f"{settings.base_url}/drone-request.html?token={drone_request.public_token}" if drone_request.public_token else None,
        },
    )


async def _send_drone_submitted_email(drone_request):
    await email_service.send_email(
        to_email=drone_request.email,
        subject=f"Drone flight request received {drone_request.reference_number}",
        template_name="drone_request_submitted.html",
        template_vars={
            "name": drone_request.operator_name,
            "reference_number": drone_request.reference_number,
            "status": drone_request.status.value,
            "takeoff_time": drone_request.estimated_takeoff_at.strftime("%Y-%m-%d %H:%M"),
            "completion_time": drone_request.estimated_completion_at.strftime("%Y-%m-%d %H:%M"),
            "location": drone_request.location_description or f"{drone_request.location_latitude}, {drone_request.location_longitude}",
            "maximum_elevation_ft_agl": drone_request.maximum_elevation_ft_agl,
            "edit_url": f"{settings.base_url}/drone-request.html?token={drone_request.public_token}" if drone_request.public_token else None,
        },
    )


async def _send_drone_tower_notification(drone_request):
    tower_email = settings.drone_request_tower_email or settings.mail_from
    await email_service.send_email(
        to_email=tower_email,
        subject=f"Drone flight request awaiting review {drone_request.reference_number}",
        template_name="drone_request_tower_notification.html",
        template_vars={
            "reference_number": drone_request.reference_number,
            "operator_name": drone_request.operator_name,
            "operator_id": drone_request.operator_id,
            "flyer_name": drone_request.flyer_name,
            "flyer_id": drone_request.flyer_id,
            "email": drone_request.email,
            "phone": drone_request.phone,
            "takeoff_time": drone_request.estimated_takeoff_at.strftime("%Y-%m-%d %H:%M"),
            "completion_time": drone_request.estimated_completion_at.strftime("%Y-%m-%d %H:%M"),
            "location": drone_request.location_description or f"{drone_request.location_latitude}, {drone_request.location_longitude}",
            "maximum_elevation_ft_agl": drone_request.maximum_elevation_ft_agl,
            "inside_frz": "Yes" if drone_request.location_inside_frz else "No",
            "notes": drone_request.applicant_notes,
            "requests_url": f"{settings.base_url}/drone-requests",
        },
        reply_to=f"{drone_request.operator_name} <{drone_request.email}>",
    )


async def _send_drone_approved_email(drone_request, message: Optional[str] = None):
    await email_service.send_email(
        to_email=drone_request.email,
        subject=f"Drone request {drone_request.reference_number} APPROVED",
        template_name="drone_request_approved.html",
        template_vars={
            "name": drone_request.operator_name,
            "reference_number": drone_request.reference_number,
            "status": drone_request.status.value,
            "message": message,
            "takeoff_time": drone_request.estimated_takeoff_at.strftime("%Y-%m-%d %H:%M"),
            "completion_time": drone_request.estimated_completion_at.strftime("%Y-%m-%d %H:%M"),
            "location": drone_request.location_description or f"{drone_request.location_latitude}, {drone_request.location_longitude}",
            "maximum_elevation_ft_agl": drone_request.maximum_elevation_ft_agl,
            "edit_url": f"{settings.base_url}/drone-request.html?token={drone_request.public_token}" if drone_request.public_token else None,
        },
    )


def _public_submission_response(drone_request):
    payload = DroneRequest.model_validate(drone_request, from_attributes=True).model_dump(mode="json")
    payload["request_id"] = drone_request.reference_number
    payload["secure_link"] = f"{settings.base_url}/drone-request.html?token={drone_request.public_token}"
    return payload


@router.get("/", response_model=List[DroneRequest])
async def get_drone_requests(
    skip: int = 0,
    limit: int = 100,
    status: Optional[DroneRequestStatus] = None,
    date_from: Optional[date] = None,
    date_to: Optional[date] = None,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_read_user),
):
    return crud_drone_request.get_multi(
        db,
        skip=skip,
        limit=limit,
        status=status,
        date_from=date_from,
        date_to=date_to,
    )


@router.post("/public", response_model=DroneRequestPublicSubmission)
async def create_public_drone_request(
    request: Request,
    drone_request_in: DroneRequestCreate,
    db: Session = Depends(get_db),
):
    client_ip = get_client_ip(request)
    drone_request = crud_drone_request.create(
        db,
        obj_in=drone_request_in,
        created_by="public",
        user_ip=client_ip,
        submitted_via="PUBLIC",
    )

    await _broadcast(request, "drone_request_created", drone_request)
    await _send_drone_submitted_email(drone_request)
    await _send_drone_tower_notification(drone_request)
    return _public_submission_response(drone_request)


@router.get("/public/edit/{token}", response_model=DroneRequest)
async def get_drone_request_for_edit(
    token: str,
    db: Session = Depends(get_db),
):
    drone_request = crud_drone_request.get_by_public_token(db, token)
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Invalid or expired token")
    return drone_request


@router.patch("/public/edit/{token}", response_model=DroneRequest)
async def update_drone_request_public(
    token: str,
    drone_request_in: DroneRequestUpdate,
    request: Request,
    db: Session = Depends(get_db),
):
    drone_request = crud_drone_request.get_by_public_token(db, token)
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Invalid or expired token")
    if drone_request.status not in [DroneRequestStatus.NEW, DroneRequestStatus.APPROVED]:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Drone request cannot be edited while {drone_request.status.value}",
        )

    client_ip = get_client_ip(request)
    updated_request = crud_drone_request.update(
        db,
        db_obj=drone_request,
        obj_in=drone_request_in,
        user="public",
        user_ip=client_ip,
    )
    await _broadcast(request, "drone_request_updated", updated_request)
    return updated_request


@router.delete("/public/cancel/{token}", response_model=DroneRequest)
async def cancel_drone_request_public(
    token: str,
    request: Request,
    db: Session = Depends(get_db),
):
    drone_request = crud_drone_request.get_by_public_token(db, token)
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Invalid or expired token")
    if drone_request.status not in [DroneRequestStatus.NEW, DroneRequestStatus.APPROVED]:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Drone request cannot be cancelled while {drone_request.status.value}",
        )

    client_ip = get_client_ip(request)
    cancelled_request = crud_drone_request.update_status(
        db,
        request_id=drone_request.id,
        status=DroneRequestStatus.CANCELED,
        comment="Cancelled by operator using secure link",
        user="public",
        user_ip=client_ip,
    )
    await _broadcast(request, "drone_request_status_update", cancelled_request)
    await _send_drone_email(
        cancelled_request,
        f"Drone request {cancelled_request.reference_number} CANCELED",
        "Your drone flight request has been cancelled.",
    )
    return cancelled_request


@router.get("/frz")
async def get_swansea_drone_frz():
    return swansea_frz_geojson()


@router.get("/{request_id}", response_model=DroneRequest)
async def get_drone_request(
    request_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_read_user),
):
    drone_request = crud_drone_request.get(db, request_id)
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Drone request not found")
    return drone_request


@router.patch("/{request_id}", response_model=DroneRequest)
async def update_drone_request(
    request: Request,
    request_id: int,
    drone_request_in: DroneRequestUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_operator_user),
):
    db_request = crud_drone_request.get(db, request_id)
    if not db_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Drone request not found")

    client_ip = get_client_ip(request)
    drone_request = crud_drone_request.update(
        db,
        db_obj=db_request,
        obj_in=drone_request_in,
        user=current_user.username,
        user_ip=client_ip,
    )
    await _broadcast(request, "drone_request_updated", drone_request)
    return drone_request


@router.patch("/{request_id}/status", response_model=DroneRequest)
async def update_drone_request_status(
    request: Request,
    request_id: int,
    status_update: DroneRequestStatusUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_operator_user),
):
    client_ip = get_client_ip(request)
    drone_request = crud_drone_request.update_status(
        db,
        request_id=request_id,
        status=status_update.status,
        comment=status_update.comment,
        user=current_user.username,
        user_ip=client_ip,
    )
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Drone request not found")

    await _broadcast(request, "drone_request_status_update", drone_request)
    message = status_update.comment or f"Your drone flight request status is now {drone_request.status.value}."
    if drone_request.status == DroneRequestStatus.APPROVED:
        await _send_drone_approved_email(drone_request, status_update.comment)
    else:
        await _send_drone_email(
            drone_request,
            f"Drone request {drone_request.reference_number} {drone_request.status.value}",
            message,
        )
    return drone_request


@router.post("/{request_id}/comments", response_model=DroneRequest)
async def add_drone_request_comment(
    request: Request,
    request_id: int,
    comment_in: DroneRequestComment,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_operator_user),
):
    client_ip = get_client_ip(request)
    drone_request = crud_drone_request.add_comment(
        db,
        request_id=request_id,
        comment=comment_in.comment,
        user=current_user.username,
        user_ip=client_ip,
    )
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Drone request not found")

    await _broadcast(request, "drone_request_comment_added", drone_request)
    if comment_in.email_applicant:
        await _send_drone_email(
            drone_request,
            f"Drone request {drone_request.reference_number} update",
            comment_in.comment,
        )
    return drone_request


@router.get("/{request_id}/journal", response_model=List[JournalEntryResponse])
async def get_drone_request_journal(
    request_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_read_user),
):
    drone_request = crud_drone_request.get(db, request_id)
    if not drone_request:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Drone request not found")
    return crud_journal.get_entity_journal(db, EntityType.DRONE_REQUEST, request_id)