from datetime import datetime, timezone
from typing import Any, Dict, List, Optional
from fastapi import APIRouter, Body, Header, HTTPException
import requests

from app.core.config import (
    SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY, SUPABASE_TIMEOUT_SECONDS,
    VEHICLE_SELECT_FIELDS, supabase_configured, LOGGER, SUPABASE_ANON_KEY,
)
from app.security.auth import (
    require_authenticated_user, _supabase_headers, _normalize_spaces,
)
from app.api.helpers import _resolve_otp_identifier, _verify_supabase_otp, _normalize_otp_channel
from app.services.supabase_client import supabase_get_profile_by_user_id

router = APIRouter(prefix="/vehicles", tags=["vehicles"])


def _extract_vehicle_payload(payload: Dict[str, Any], *, require_plate: bool) -> Dict[str, str]:
    def _pick(*keys: str) -> Optional[str]:
        for key in keys:
            value = payload.get(key)
            if value is None:
                continue
            normalized_value = _normalize_spaces(str(value))
            if normalized_value:
                return normalized_value
        return None
    plate_letters_ar = _pick("plate_letters_ar", "plate_letters")
    plate_numbers_ar = _pick("plate_numbers_ar", "plate_numbers")
    plate_letters_en = _pick("plate_letters_en")
    plate_numbers_en = _pick("plate_numbers_en")
    car_name = _pick("car_name", "nickname")
    car_model = _pick("car_model", "model")
    car_color = _pick("car_color", "color")
    payload_out: Dict[str, str] = {}
    if plate_letters_ar:
        payload_out["plate_letters_ar"] = plate_letters_ar
    if plate_numbers_ar:
        payload_out["plate_numbers_ar"] = plate_numbers_ar
    if plate_letters_en:
        payload_out["plate_letters_en"] = plate_letters_en
    if plate_numbers_en:
        payload_out["plate_numbers_en"] = plate_numbers_en
    if car_name:
        payload_out["car_name"] = car_name
    if car_model:
        payload_out["car_model"] = car_model
    if car_color:
        payload_out["car_color"] = car_color
    if require_plate and (not plate_letters_ar or not plate_numbers_ar):
        raise HTTPException(status_code=400, detail="plate_letters_ar and plate_numbers_ar are required.")
    if not payload_out:
        raise HTTPException(status_code=400, detail="No vehicle fields were provided.")
    return payload_out


def _create_vehicle_for_owner(owner_id: str, vehicle_payload: Dict[str, str]) -> Optional[Dict[str, Any]]:
    if not owner_id or not vehicle_payload:
        return None
    payload: Dict[str, Any] = {"owner_id": owner_id, "plate_letters_ar": vehicle_payload["plate_letters_ar"], "plate_numbers_ar": vehicle_payload["plate_numbers_ar"]}
    for opt in ["plate_letters_en", "plate_numbers_en", "car_name", "car_model", "car_color"]:
        if vehicle_payload.get(opt):
            payload[opt] = vehicle_payload[opt]
    response = requests.post(
        f"{SUPABASE_URL}/rest/v1/vehicles", json=payload,
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY, content_type="application/json", prefer="return=representation"),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code not in {200, 201}:
        raise HTTPException(status_code=400, detail=f"Failed to save vehicle: {response.text[:260]}")
    rows = response.json()
    if isinstance(rows, list) and rows and isinstance(rows[0], dict):
        return rows[0]
    return None


def _fetch_vehicle_for_owner(owner_id: str, vehicle_id: str) -> Optional[Dict[str, Any]]:
    response = requests.get(
        f"{SUPABASE_URL}/rest/v1/vehicles",
        params={"select": VEHICLE_SELECT_FIELDS, "id": f"eq.{vehicle_id}", "owner_id": f"eq.{owner_id}", "limit": "1"},
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code != 200:
        raise HTTPException(status_code=502, detail=f"Failed to fetch vehicle: {response.text[:260]}")
    rows = response.json()
    if isinstance(rows, list) and rows and isinstance(rows[0], dict):
        return rows[0]
    return None


def _list_vehicles_for_owner(owner_id: str) -> List[Dict[str, Any]]:
    if not owner_id:
        return []
    response = requests.get(
        f"{SUPABASE_URL}/rest/v1/vehicles",
        params={"select": VEHICLE_SELECT_FIELDS, "owner_id": f"eq.{owner_id}", "order": "created_at.desc"},
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code != 200:
        raise HTTPException(status_code=502, detail=f"Failed to list vehicles: {response.text[:260]}")
    rows = response.json()
    if not isinstance(rows, list):
        return []
    return [row for row in rows if isinstance(row, dict)]


def _update_vehicle_for_owner(owner_id: str, vehicle_id: str, update_payload: Dict[str, Any]) -> Optional[Dict[str, Any]]:
    response = requests.patch(
        f"{SUPABASE_URL}/rest/v1/vehicles",
        params={"id": f"eq.{vehicle_id}", "owner_id": f"eq.{owner_id}", "select": VEHICLE_SELECT_FIELDS},
        json=update_payload,
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY, content_type="application/json", prefer="return=representation"),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code not in {200, 204}:
        raise HTTPException(status_code=400, detail=f"Failed to update vehicle: {response.text[:260]}")
    if not response.text:
        return _fetch_vehicle_for_owner(owner_id, vehicle_id)
    rows = response.json()
    if isinstance(rows, list) and rows and isinstance(rows[0], dict):
        return rows[0]
    return _fetch_vehicle_for_owner(owner_id, vehicle_id)


def _delete_vehicle_for_owner(owner_id: str, vehicle_id: str) -> bool:
    response = requests.delete(
        f"{SUPABASE_URL}/rest/v1/vehicles",
        params={"id": f"eq.{vehicle_id}", "owner_id": f"eq.{owner_id}", "select": "id"},
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY, prefer="return=representation"),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code not in {200, 204}:
        raise HTTPException(status_code=400, detail=f"Failed to delete vehicle: {response.text[:260]}")
    if not response.text:
        return True
    rows = response.json()
    return isinstance(rows, list) and len(rows) > 0


def _fetch_vehicle_by_plate_for_owner(owner_id: str, plate_letters_ar: str, plate_numbers_ar: str) -> Optional[Dict[str, Any]]:
    response = requests.get(
        f"{SUPABASE_URL}/rest/v1/vehicles",
        params={"select": VEHICLE_SELECT_FIELDS, "owner_id": f"eq.{owner_id}", "plate_letters_ar": f"eq.{plate_letters_ar}", "plate_numbers_ar": f"eq.{plate_numbers_ar}", "limit": "1"},
        headers=_supabase_headers(api_key=SUPABASE_SERVICE_ROLE_KEY, bearer=SUPABASE_SERVICE_ROLE_KEY),
        timeout=SUPABASE_TIMEOUT_SECONDS,
    )
    if response.status_code != 200:
        raise HTTPException(status_code=502, detail=f"Failed to fetch vehicle by plate: {response.text[:260]}")
    rows = response.json()
    if isinstance(rows, list) and rows and isinstance(rows[0], dict):
        return rows[0]
    return None


@router.post("/add")
def vehicles_add(payload: Dict[str, Any] = Body(...), authorization: Optional[str] = Header(default=None)) -> Dict[str, Any]:
    if not supabase_configured():
        raise HTTPException(status_code=503, detail="Supabase is not configured.")
    request_user = require_authenticated_user(authorization)
    if request_user is None:
        raise HTTPException(status_code=401, detail="Authentication is required.")
    requester_id = str(request_user.get("id") or "").strip()
    if not requester_id:
        raise HTTPException(status_code=401, detail="Authenticated user id is missing.")
    vehicle_payload = _extract_vehicle_payload(payload, require_plate=True)
    created_vehicle = _create_vehicle_for_owner(requester_id, vehicle_payload)
    if not isinstance(created_vehicle, dict):
        raise HTTPException(status_code=502, detail="Vehicle was not created.")
    return {"status": "ok", "vehicle": created_vehicle}


@router.get("/my")
def vehicles_my(include_inactive: bool = False, authorization: Optional[str] = Header(default=None)) -> Dict[str, Any]:
    request_user = require_authenticated_user(authorization)
    if request_user is None:
        raise HTTPException(status_code=401, detail="Authentication is required.")
    requester_id = str(request_user.get("id") or "").strip()
    if not requester_id:
        raise HTTPException(status_code=401, detail="Authenticated user id is missing.")
    rows = _list_vehicles_for_owner(requester_id)
    if not include_inactive:
        rows = [row for row in rows if bool(row.get("is_active", True))]
    return {"status": "ok", "count": len(rows), "vehicles": rows}


@router.put("/{vehicle_id}")
def vehicles_update(vehicle_id: str, payload: Dict[str, Any] = Body(...), authorization: Optional[str] = Header(default=None)) -> Dict[str, Any]:
    request_user = require_authenticated_user(authorization)
    if request_user is None:
        raise HTTPException(status_code=401, detail="Authentication is required.")
    requester_id = str(request_user.get("id") or "").strip()
    update_payload: Dict[str, Any] = {}
    try:
        update_payload.update(_extract_vehicle_payload(payload, require_plate=False))
    except HTTPException as exc:
        if str(exc.detail) != "No vehicle fields were provided.":
            raise
    if "is_active" in payload:
        raw = payload.get("is_active")
        if isinstance(raw, bool):
            update_payload["is_active"] = raw
        elif raw is not None:
            update_payload["is_active"] = str(raw).strip().lower() in {"1", "true", "yes", "on"}
    if not update_payload:
        raise HTTPException(status_code=400, detail="No updatable vehicle fields were provided.")
    updated_vehicle = _update_vehicle_for_owner(requester_id, vehicle_id, update_payload)
    if not isinstance(updated_vehicle, dict):
        raise HTTPException(status_code=404, detail="Vehicle was not found.")
    return {"status": "ok", "vehicle": updated_vehicle}


@router.delete("/{vehicle_id}")
def vehicles_delete(vehicle_id: str, authorization: Optional[str] = Header(default=None)) -> Dict[str, Any]:
    request_user = require_authenticated_user(authorization)
    if request_user is None:
        raise HTTPException(status_code=401, detail="Authentication is required.")
    requester_id = str(request_user.get("id") or "").strip()
    vehicle_record = _fetch_vehicle_for_owner(requester_id, vehicle_id)
    if not isinstance(vehicle_record, dict):
        raise HTTPException(status_code=404, detail="Vehicle was not found.")
    deleted = _delete_vehicle_for_owner(requester_id, vehicle_id)
    if not deleted:
        raise HTTPException(status_code=404, detail="Vehicle was not found.")
    return {"status": "ok", "deleted_vehicle_id": vehicle_id}


@router.post("/verify")
def vehicles_verify(
    payload: Dict[str, Any] = Body(...),
    authorization: Optional[str] = Header(default=None),
) -> Dict[str, Any]:
    request_user = require_authenticated_user(authorization)
    if request_user is None:
        raise HTTPException(status_code=401, detail="Authentication is required.")
    requester_id = str(request_user.get("id") or "").strip()
    if not requester_id:
        raise HTTPException(status_code=401, detail="Authenticated user id is missing.")
    profile = supabase_get_profile_by_user_id(requester_id)
    if not isinstance(profile, dict):
        raise HTTPException(status_code=404, detail="Profile was not found.")
    vehicle_id = _normalize_spaces(str(payload.get("vehicle_id") or ""))
    if vehicle_id:
        vehicle = _fetch_vehicle_for_owner(requester_id, vehicle_id)
    else:
        vehicle_plate_payload = _extract_vehicle_payload(payload, require_plate=True)
        vehicle = _fetch_vehicle_by_plate_for_owner(
            requester_id,
            vehicle_plate_payload["plate_letters_ar"],
            vehicle_plate_payload["plate_numbers_ar"],
        )
    if not isinstance(vehicle, dict):
        raise HTTPException(status_code=404, detail="Vehicle was not found.")
    channel = _normalize_otp_channel(str(payload.get("channel") or payload.get("otp_channel") or "email"))
    identifier = _resolve_otp_identifier(channel=channel, payload=payload, profile=profile)
    _verify_supabase_otp(
        channel=channel,
        identifier=identifier,
        token=str(payload.get("otp_token") or payload.get("token") or ""),
        verify_type=str(payload.get("type") or payload.get("verify_type") or "").strip() or None,
        purpose="vehicle_verify",
    )
    resolved_vehicle_id = str(vehicle.get("id") or "").strip()
    updated_vehicle = _update_vehicle_for_owner(
        requester_id,
        resolved_vehicle_id,
        {
            "is_verified": True,
            "verified_at": datetime.now(timezone.utc).isoformat(),
            "verified_by": requester_id,
        },
    )
    return {
        "status": "ok",
        "channel": channel,
        "vehicle": updated_vehicle or vehicle,
        "message": "Vehicle ownership verified.",
    }