from collections import defaultdict
from datetime import datetime
from os import environ

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from rich import print

from backend.db import db
from backend.idfm_interface import IdfmInterface
from backend.models import Line, Stop, StopArea
from backend.schemas import (
    Line as LineSchema,
    TransportMode,
    NextPassage as NextPassageSchema,
    NextPassages as NextPassagesSchema,
    Stop as StopSchema,
    StopArea as StopAreaSchema,
)

API_KEY = environ.get("API_KEY")
# TODO: Add error message if no key is given.

# TODO: Remove postgresql+asyncpg from environ variable
DB_PATH = "postgresql+asyncpg://cer_user:cer_password@127.0.0.1:5438/cer_db"


app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=[
        "https://localhost:4443",
        "https://localhost:3000",
    ],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

idfm_interface = IdfmInterface(API_KEY, db)


@app.on_event("startup")
async def startup():
    # await db.connect(DB_PATH, clear_static_data=True)
    # await idfm_interface.startup()
    await db.connect(DB_PATH, clear_static_data=False)
    print("Connected")


@app.on_event("shutdown")
async def shutdown():
    await db.disconnect()


# /addwidget https://localhost:4443/static/#?widgetId=$matrix_widget_id&userId=$matrix_user_id
# /addwidget https://localhost:3000/widget?widgetId=$matrix_widget_id&userId=$matrix_user_id
STATIC_ROOT = "../frontend/"
app.mount("/widget", StaticFiles(directory=STATIC_ROOT, html=True), name="widget")


def optional_datetime_to_ts(dt: datetime) -> int | None:
    return dt.timestamp() if dt else None


@app.get("/line/{line_id}", response_model=LineSchema)
async def get_line(line_id: str) -> JSONResponse:
    line: Line | None = await Line.get_by_id(line_id)

    if line is None:
        raise HTTPException(status_code=404, detail=f'Line "{line_id}" not found')

    return LineSchema(
        id=line.id,
        shortName=line.short_name,
        name=line.name,
        status=line.status,
        transportMode=TransportMode.from_idfm_transport_mode(
            line.transport_mode, line.transport_submode
        ),
        backColorHexa=line.colour_web_hexa,
        foreColorHexa=line.text_colour_hexa,
        operatorId=line.operator_id,
        accessibility=line.accessibility,
        visualSignsAvailable=line.visual_signs_available,
        audibleSignsAvailable=line.audible_signs_available,
        stopIds=[stop.id for stop in line.stops],
    )


def _format_stop(stop: Stop) -> StopSchema:
    print(stop.__dict__)
    return StopSchema(
        id=stop.id,
        name=stop.name,
        town=stop.town_name,
        # xepsg2154=stop.xepsg2154,
        # yepsg2154=stop.yepsg2154,
        lat=stop.latitude,
        lon=stop.longitude,
        lines=[line.id for line in stop.lines],
    )

# châtelet

@app.get("/stop/")
async def get_stop(
    name: str = "", limit: int = 10
) -> list[StopAreaSchema | StopSchema]:
    # TODO: Add limit support

    formatted = []
    matching_stops = await Stop.get_by_name(name)
    # print(matching_stops, flush=True)

    stop_areas: dict[int, StopArea] = {}
    stops: dict[int, Stop] = {}
    for stop in matching_stops:
        # print(f"{stop.__dict__ = }", flush=True)
        dst = stop_areas if isinstance(stop, StopArea) else stops
        dst[stop.id] = stop

    for stop_area in stop_areas.values():

        formatted_stops = []
        for stop in stop_area.stops:
            formatted_stops.append(_format_stop(stop))
            try:
                del stops[stop.id]
            except KeyError as err:
                print(err)

        formatted.append(
            StopAreaSchema(
                id=stop_area.id,
                name=stop_area.name,
                town=stop_area.town_name,
                # xepsg2154=stop_area.xepsg2154,
                # yepsg2154=stop_area.yepsg2154,
                type=stop_area.type,
                lines=[line.id for line in stop_area.lines],
                stops=formatted_stops,
            )
        )

    # print(f"{stops = }", flush=True)
    formatted.extend(_format_stop(stop) for stop in stops.values())

    return formatted


# TODO: Cache response for 30 secs ?
@app.get("/stop/nextPassages/{stop_id}")
async def get_next_passages(stop_id: str) -> JSONResponse:
    res = await idfm_interface.get_next_passages(stop_id)

    # print(res)

    service_delivery = res.Siri.ServiceDelivery
    stop_monitoring_deliveries = service_delivery.StopMonitoringDelivery

    by_line_by_dst_passages = defaultdict(lambda: defaultdict(list))

    for delivery in stop_monitoring_deliveries:
        for stop_visit in delivery.MonitoredStopVisit:

            journey = stop_visit.MonitoredVehicleJourney

            # re.match will return None if the given journey.LineRef.value is not valid.
            try:
                line_id = IdfmInterface.LINE_RE.match(journey.LineRef.value).group(1)
            except AttributeError as exc:
                raise HTTPException(
                    status_code=404, detail=f'Line "{journey.LineRef.value}" not found'
                ) from exc

            call = journey.MonitoredCall

            dst_names = call.DestinationDisplay
            dsts = [dst.value for dst in dst_names] if dst_names else []

            print(f"{call.ArrivalPlatformName = }")

            next_passage = NextPassageSchema(
                line=line_id,
                operator=journey.OperatorRef.value,
                destinations=dsts,
                atStop=call.VehicleAtStop,
                aimedArrivalTs=optional_datetime_to_ts(call.AimedArrivalTime),
                expectedArrivalTs=optional_datetime_to_ts(call.ExpectedArrivalTime),
                arrivalPlatformName=call.ArrivalPlatformName.value if call.ArrivalPlatformName else None,
                aimedDepartTs=optional_datetime_to_ts(call.AimedDepartureTime),
                expectedDepartTs=optional_datetime_to_ts(call.ExpectedDepartureTime),
                arrivalStatus=call.ArrivalStatus.value,
                departStatus=call.DepartureStatus.value,
            )

            by_line_passages = by_line_by_dst_passages[line_id]
            # TODO: by_line_passages[dst].extend(dsts) instead ?
            for dst in dsts:
                by_line_passages[dst].append(next_passage)

    return NextPassagesSchema(
        ts=service_delivery.ResponseTimestamp.timestamp(),
        passages=by_line_by_dst_passages,
    )