"""Configura ODBC portable desde config/odbc/."""

import os
import sys
from pathlib import Path

from ..constants import IS_WINDOWS, ODBC_DIR
from ..utils.logger import app_logger


def _write_portable_odbc_ini(odbc_dir: Path) -> None:
    """Genera odbcinst.ini mínimo si no existe."""
    inst = odbc_dir / "odbcinst.ini"
    if inst.exists():
        return

    if IS_WINDOWS:
        driver_path = odbc_dir / "msodbcsql18.dll"
        if not driver_path.exists():
            for candidate in odbc_dir.glob("msodbcsql*.dll"):
                driver_path = candidate
                break
        driver_line = str(driver_path.resolve()) if driver_path.exists() else "msodbcsql18.dll"
        content = f"""[ODBC Driver 18 for SQL Server]
Description=Microsoft ODBC Driver 18 for SQL Server
Driver={driver_line}
UsageCount=1
"""
    else:
        so_path = None
        for pattern in ("libmsodbcsql-18*.so*", "msodbcsql-18*.so*"):
            matches = list(odbc_dir.glob(pattern))
            if matches:
                so_path = matches[0]
                break
        driver_line = str(so_path.resolve()) if so_path else "libmsodbcsql-18.so"
        content = f"""[ODBC Driver 18 for SQL Server]
Description=Microsoft ODBC Driver 18 for SQL Server
Driver={driver_line}
UsageCount=1
"""
    inst.write_text(content, encoding="utf-8")

    ini = odbc_dir / "odbc.ini"
    if not ini.exists():
        ini.write_text("[ODBC Data Sources]\n", encoding="utf-8")


def configure_odbc_environment() -> None:
    """Apunta pyodbc al driver embebido en config/odbc si está disponible."""
    if not ODBC_DIR.is_dir():
        return

    lib_dir = ODBC_DIR / "lib"
    if lib_dir.is_dir():
        existing = os.environ.get("LD_LIBRARY_PATH", "")
        lib_path = str(lib_dir.resolve())
        if lib_path not in existing.split(":"):
            os.environ["LD_LIBRARY_PATH"] = (
                f"{lib_path}:{existing}" if existing else lib_path
            )

    _write_portable_odbc_ini(ODBC_DIR)
    odbc_sys = str(ODBC_DIR.resolve())
    os.environ["ODBCSYSINI"] = odbc_sys
    os.environ["ODBCINI"] = str((ODBC_DIR / "odbc.ini").resolve())

    if IS_WINDOWS:
        os.environ["PATH"] = odbc_sys + os.pathsep + os.environ.get("PATH", "")

    app_logger.debug(f"ODBC configurado: ODBCSYSINI={odbc_sys}")