import requests
import urllib3
import os
import json
from typing import Optional, Dict, Any
from dotenv import load_dotenv
from logger_manager import get_logger
# ============================================================================
urllib3.disable_warnings()

load_dotenv(dotenv_path=".env")

SAPB1_URL = os.getenv("SAP_B1_URL", "")
SAPB1_USER = os.getenv("SAP_B1_USER", "")
SAPB1_PASSWORD = os.getenv("SAP_B1_PASSWORD", "")
SAPB1_COMPANY = os.getenv("SAP_B1_COMPANY", "")
SAPB1_TIMEOUT = float(os.getenv("SAP_B1_TIMEOUT", 15.0))
SAPB1_VERIFY_SSL = os.getenv("SAP_B1_VERIFY_SSL", "False").lower() == "true"

_sap_session: dict = {"headers": None, "b1session": None, "routeid": None}
# ============================================================================
log = get_logger()

# ============================================================================
def login() -> dict:
    payload = {
        "CompanyDB": SAPB1_COMPANY,
        "UserName": SAPB1_USER,
        "Password": SAPB1_PASSWORD,
    }
    log.info("🔐 Iniciando sesión en SAP B1 Service Layer...")
    resp = requests.post(
        f"{SAPB1_URL}/Login",
        json=payload,
        timeout=SAPB1_TIMEOUT,
        verify=SAPB1_VERIFY_SSL,
    )
    if resp.status_code != 200:
        raise ConnectionError(
            f"Login fallido: HTTP {resp.status_code} - {resp.text}"
        )

    data = resp.json()
    b1session = data["SessionId"]
    routeid = resp.cookies.get("ROUTEID", "")

    headers = {"Cookie": f"B1SESSION={b1session}; ROUTEID={routeid}"}
    _sap_session.update({"headers": headers, "b1session": b1session, "routeid": routeid})
    log.info("✅ Sesión SAP B1 establecida (B1SESSION: {}...)".format(b1session[:10]))
    return headers

# ============================================================================
def logout() -> None:
    if not _sap_session["b1session"]:
        log.warning("⚠️ No hay sesión activa para cerrar.")
        return
    log.info("🔓 Cerrando sesión SAP B1...")
    try:
        resp = requests.post(
            f"{SAPB1_URL}/Logout",
            headers=_sap_session["headers"],
            timeout=SAPB1_TIMEOUT,
            verify=SAPB1_VERIFY_SSL,
        )
        if resp.status_code == 200:
            log.info("✅ Sesión SAP B1 cerrada correctamente.")
        else:
            log.warning("⚠️ Logout respondió HTTP {}".format(resp.status_code))
    except Exception as exc:
        log.error("❌ Error al cerrar sesión: {}".format(exc))
    finally:
        _sap_session.update({"headers": None, "b1session": None, "routeid": None})

# ============================================================================
def _ensure_session() -> dict:
    if _sap_session["headers"]:
        return _sap_session["headers"]
    return login()

# ============================================================================
def _log_response(method: str, endpoint: str, response: requests.Response, payload: Any = None) -> None:
    log_line = "[{}] {} → {} ({} bytes)".format(
        method, endpoint, response.status_code, len(response.content)
    )
    if response.status_code >= 400:
        log.warning("⚠️ {} - {}".format(log_line, response.text[:300]))
    else:
        log.info("🔄 " + log_line)

# ============================================================================
def forward_to_sapb1(
    method: str,
    endpoint_path: str,
    json_data: Optional[Dict[str, Any]] = None,
    params: Optional[Dict[str, Any]] = None,
    extra_headers: Optional[Dict[str, str]] = None,
    raise_on_error: bool = True,
) -> requests.Response:
    if not method or not endpoint_path:
        raise ValueError("method y endpoint_path son requeridos")

    method = method.upper()
    headers = _ensure_session()

    url = f"{SAPB1_URL}/{endpoint_path}"
    req_headers = {
        "Content-Type": "application/json",
        "Accept": "application/json",
        **_sap_session["headers"],
    }

    if extra_headers:
        req_headers.update(extra_headers)

    try:
        resp = requests.request(
            method=method,
            url=url,
            json=json_data,
            params=params,
            headers=req_headers,
            timeout=SAPB1_TIMEOUT,
            verify=SAPB1_VERIFY_SSL,
        )
    except requests.exceptions.Timeout:
        raise ConnectionError(f"Timeout ({SAPB1_TIMEOUT}s) en {endpoint_path}")
    except requests.exceptions.ConnectionError as exc:
        raise ConnectionError(f"No se pudo conectar con SAP B1: {exc}")
    except requests.RequestException as exc:
        raise ConnectionError(f"Error en solicitud HTTP: {exc}")

    if resp.status_code == 401:
        log.warning("⚠️ Sesión expirada (401). Reautenticando e intentando una vez...")
        req_headers["Cookie"] = login()["Cookie"]
        resp = requests.request(
            method=method,
            url=url,
            json=json_data,
            params=params,
            headers=req_headers,
            timeout=SAPB1_TIMEOUT,
            verify=SAPB1_VERIFY_SSL,
        )

    _log_response(method, endpoint_path, resp, json_data)

    if raise_on_error and resp.status_code >= 400:
        try:
            error_body = resp.json()
            sap_message = (
                error_body.get("error", {})
                .get("message", {})
                .get("value", resp.text)
            )
        except (json.JSONDecodeError, AttributeError):
            sap_message = resp.text
        raise ConnectionError(
            f"Error en SAP {method} {endpoint_path}: "
            f"HTTP {resp.status_code} - {sap_message}"
        )

    return resp

# ============================================================================
def create_drafts(payload: dict) -> dict:
    resp = forward_to_sapb1("POST", "Drafts", json_data=payload, raise_on_error=False)

    if resp.status_code == 201:
        result = resp.json()
        log.info("✅ Draft creado DocEntry={}".format(result.get("DocEntry")))
        return result

    try:
        error_body = resp.json()
        sap_message = (
            error_body.get("error", {})
            .get("message", {})
            .get("value", resp.text)
        )
    except (json.JSONDecodeError, AttributeError):
        sap_message = resp.text
    raise ConnectionError(
        f"Error creando Draft: HTTP {resp.status_code} - {sap_message}"
    )

# ============================================================================
def create_orders(payload: dict) -> dict:
    resp = forward_to_sapb1("POST", "Orders", json_data=payload, raise_on_error=False)

    if resp.status_code == 201:
        result = resp.json()
        log.info("✅ Orden creada DocEntry={}".format(result.get("DocEntry")))
        return result

    try:
        error_body = resp.json()
        sap_message = (
            error_body.get("error", {})
            .get("message", {})
            .get("value", resp.text)
        )
    except (json.JSONDecodeError, AttributeError):
        sap_message = resp.text
    raise ConnectionError(
        f"Error creando Orden venta: HTTP {resp.status_code} - {sap_message}"
    )
# ============================================================================