"""mobile.de integration service: push, update, delete listings and check status.

Uses httpx for async HTTP calls to the mobile.de seller listings API.
API key and seller ID are loaded from environment variables.
"""

from __future__ import annotations

import uuid
from datetime import datetime, timezone
from typing import Any

import httpx
from sqlalchemy import and_, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.models.vehicle import MobileDeListing, Vehicle
from app.utils.mobilede_mapping import map_fields

# mobile.de API base URL
_MOBILE_DE_API_BASE = "https://api.mobile.de"

# Maximum retry attempts for failed pushes
MAX_RETRIES = 3


def _get_api_headers() -> dict[str, str]:
    """Build authorization headers for mobile.de API."""
    api_key = settings.MOBILE_DE_API_KEY
    return {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json",
        "Accept": "application/json",
        "X-Mobile-DE-Seller-ID": settings.MOBILE_DE_SELLER_ID,
    }


def _get_listing_url(listing_id: str | None = None) -> str:
    """Build the mobile.de listings URL."""
    base = f"{_MOBILE_DE_API_BASE}/api/seller/listings"
    if listing_id:
        return f"{base}/{listing_id}"
    return base


def _get_status_url(listing_id: str) -> str:
    """Build the mobile.de listing status URL."""
    return f"{_MOBILE_DE_API_BASE}/api/seller/listings/{listing_id}/status"


async def push_listing(
    db: AsyncSession, vehicle: Vehicle
) -> MobileDeListing:
    """Push a vehicle listing to mobile.de.

    Creates a MobileDeListing record with status 'pending',
    sends the mapped ad data to mobile.de POST /api/seller/listings,
    and updates the listing with the returned ad_id and 'synced' status.

    On failure, sets sync_status to 'fehler' with error_log.
    """
    # Create listing record
    listing = MobileDeListing(
        vehicle_id=vehicle.id,
        sync_status="pending",
    )
    db.add(listing)
    await db.flush()

    # Map vehicle fields to mobile.de ad format
    ad_data = map_fields(vehicle)

    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            response = await client.post(
                _get_listing_url(),
                json=ad_data,
                headers=_get_api_headers(),
            )
            response.raise_for_status()

            result = response.json()
            ad_id = result.get("id") or result.get("listingId")

            listing.ad_id = str(ad_id) if ad_id else None
            listing.sync_status = "synced"
            listing.synced_at = datetime.now(timezone.utc)
            listing.error_log = None

    except httpx.HTTPStatusError as exc:
        listing.sync_status = "fehler"
        listing.error_log = (
            f"HTTP {exc.response.status_code}: {exc.response.text[:500]}"
        )
    except (httpx.RequestError, httpx.HTTPError) as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Request error: {str(exc)[:500]}"
    except Exception as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Unexpected error: {str(exc)[:500]}"

    await db.flush()
    await db.refresh(listing)
    return listing


async def update_listing(
    db: AsyncSession, vehicle: Vehicle, listing: MobileDeListing
) -> MobileDeListing:
    """Update an existing mobile.de listing.

    Sends PUT /api/seller/listings/{id} with updated ad data.
    """
    if not listing.ad_id:
        listing.sync_status = "fehler"
        listing.error_log = "Cannot update listing without ad_id"
        await db.flush()
        await db.refresh(listing)
        return listing

    ad_data = map_fields(vehicle)

    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            response = await client.put(
                _get_listing_url(listing.ad_id),
                json=ad_data,
                headers=_get_api_headers(),
            )
            response.raise_for_status()

            listing.sync_status = "synced"
            listing.synced_at = datetime.now(timezone.utc)
            listing.error_log = None

    except httpx.HTTPStatusError as exc:
        listing.sync_status = "fehler"
        listing.error_log = (
            f"HTTP {exc.response.status_code}: {exc.response.text[:500]}"
        )
    except (httpx.RequestError, httpx.HTTPError) as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Request error: {str(exc)[:500]}"
    except Exception as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Unexpected error: {str(exc)[:500]}"

    await db.flush()
    await db.refresh(listing)
    return listing


async def delete_listing(
    db: AsyncSession, listing: MobileDeListing
) -> MobileDeListing:
    """Delete a listing from mobile.de.

    Sends DELETE /api/seller/listings/{id}.
    """
    if not listing.ad_id:
        listing.sync_status = "fehler"
        listing.error_log = "Cannot delete listing without ad_id"
        await db.flush()
        await db.refresh(listing)
        return listing

    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            response = await client.delete(
                _get_listing_url(listing.ad_id),
                headers=_get_api_headers(),
            )
            response.raise_for_status()

            listing.sync_status = "deleted"
            listing.error_log = None

    except httpx.HTTPStatusError as exc:
        listing.sync_status = "fehler"
        listing.error_log = (
            f"HTTP {exc.response.status_code}: {exc.response.text[:500]}"
        )
    except (httpx.RequestError, httpx.HTTPError) as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Request error: {str(exc)[:500]}"
    except Exception as exc:
        listing.sync_status = "fehler"
        listing.error_log = f"Unexpected error: {str(exc)[:500]}"

    await db.flush()
    await db.refresh(listing)
    return listing


async def get_listing_status(
    db: AsyncSession, vehicle_id: uuid.UUID
) -> MobileDeListing | None:
    """Get the latest mobile.de listing status for a vehicle.

    Returns the most recent MobileDeListing record, or None if no listing exists.
    """
    stmt = (
        select(MobileDeListing)
        .where(MobileDeListing.vehicle_id == vehicle_id)
        .order_by(MobileDeListing.created_at.desc())
        .limit(1)
    )
    result = await db.execute(stmt)
    return result.scalar_one_or_none()


async def retry_failed_listing(
    db: AsyncSession, listing: MobileDeListing, vehicle: Vehicle
) -> MobileDeListing:
    """Retry a failed listing push.

    Increments retry count (tracked via error_log prefix) and re-attempts push.
    After MAX_RETRIES, marks as permanently failed.
    """
    # Count existing retries from error_log
    retry_count = 0
    if listing.error_log and listing.error_log.startswith("[retry"):
        try:
            retry_count = int(listing.error_log.split("]")[0].split("retry ")[1])
        except (IndexError, ValueError):
            retry_count = 0

    if retry_count >= MAX_RETRIES:
        listing.sync_status = "fehler"
        listing.error_log = (
            f"Max retries ({MAX_RETRIES}) exceeded. "
            f"Last error: {listing.error_log}"
        )
        await db.flush()
        await db.refresh(listing)
        return listing

    # Attempt re-push
    listing.sync_status = "pending"
    listing.error_log = f"[retry {retry_count + 1}] Retrying push"
    await db.flush()

    return await push_listing(db, vehicle)