"""
Data Subject Request (DSR) API - Betroffenenanfragen nach DSGVO
Benutzer-Endpunkte zum Erstellen und Verwalten eigener Betroffenenanfragen
"""

from fastapi import APIRouter, HTTPException, Header, Query
from typing import Optional, List, Dict, Any
from pydantic import BaseModel, EmailStr
import httpx
import os

from consent_client import generate_jwt_token, JWT_SECRET

# Consent Service URL
CONSENT_SERVICE_URL = os.getenv("CONSENT_SERVICE_URL", "http://localhost:8081")

router = APIRouter(prefix="/v1/dsr", tags=["dsr"])


# Request Models
class CreateDSRRequest(BaseModel):
    """Anfrage zum Erstellen einer Betroffenenanfrage"""
    request_type: str  # access, rectification, erasure, restriction, portability
    requester_email: Optional[str] = None
    requester_name: Optional[str] = None
    requester_phone: Optional[str] = None
    request_details: Optional[Dict[str, Any]] = None


# Helper to extract token
def get_token(authorization: Optional[str]) -> str:
    if authorization:
        parts = authorization.split(" ")
        if len(parts) == 2 and parts[0] == "Bearer":
            return parts[1]
    raise HTTPException(status_code=401, detail="Authorization required")


async def proxy_request(method: str, path: str, token: str, json_data=None, query_params=None):
    """Proxied Anfragen an den Go Consent Service"""
    url = f"{CONSENT_SERVICE_URL}/api/v1{path}"
    headers = {
        "Authorization": f"Bearer {token}",
        "Content-Type": "application/json"
    }

    async with httpx.AsyncClient() as client:
        try:
            if method == "GET":
                response = await client.get(url, headers=headers, params=query_params, timeout=10.0)
            elif method == "POST":
                response = await client.post(url, headers=headers, json=json_data, timeout=10.0)
            elif method == "PUT":
                response = await client.put(url, headers=headers, json=json_data, timeout=10.0)
            elif method == "DELETE":
                response = await client.delete(url, headers=headers, timeout=10.0)
            else:
                raise HTTPException(status_code=400, detail="Invalid method")

            if response.status_code >= 400:
                error_detail = response.json() if response.content else {"error": "Unknown error"}
                raise HTTPException(status_code=response.status_code, detail=error_detail)

            return response.json() if response.content else {"success": True}

        except httpx.RequestError as e:
            raise HTTPException(status_code=503, detail=f"Consent Service unavailable: {str(e)}")


# ==========================================
# User DSR Endpoints
# ==========================================

@router.post("")
async def create_dsr(
    request: CreateDSRRequest,
    authorization: str = Header(...)
):
    """
    Erstellt eine neue Betroffenenanfrage.

    request_type muss einer der folgenden Werte sein:
    - access: Auskunftsrecht (Art. 15 DSGVO)
    - rectification: Recht auf Berichtigung (Art. 16 DSGVO)
    - erasure: Recht auf Löschung (Art. 17 DSGVO)
    - restriction: Recht auf Einschränkung (Art. 18 DSGVO)
    - portability: Recht auf Datenübertragbarkeit (Art. 20 DSGVO)
    """
    token = get_token(authorization)
    return await proxy_request("POST", "/dsr", token, request.dict(exclude_none=True))


@router.get("")
async def get_my_dsrs(authorization: str = Header(...)):
    """Gibt alle eigenen Betroffenenanfragen zurück"""
    token = get_token(authorization)
    return await proxy_request("GET", "/dsr", token)


@router.get("/{dsr_id}")
async def get_my_dsr(dsr_id: str, authorization: str = Header(...)):
    """Gibt Details einer eigenen Betroffenenanfrage zurück"""
    token = get_token(authorization)
    return await proxy_request("GET", f"/dsr/{dsr_id}", token)


@router.post("/{dsr_id}/cancel")
async def cancel_my_dsr(dsr_id: str, authorization: str = Header(...)):
    """Storniert eine eigene Betroffenenanfrage"""
    token = get_token(authorization)
    return await proxy_request("POST", f"/dsr/{dsr_id}/cancel", token)