"""
Gestión de configuración de usuario con QSettings.

Persiste preferencias: idioma, tema, unidades, archivos recientes, etc.
"""

from __future__ import annotations

from PySide6.QtCore import QSettings

APP_NAME = "ARShipDesign"
ORG_NAME = "AlvaroRomero"

# Claves de configuración
KEY_LANGUAGE = "ui/language"
KEY_THEME = "ui/theme"
KEY_UNITS = "ui/units"
KEY_RECENT_FILES = "project/recentFiles"
KEY_MAX_RECENT = "project/maxRecentFiles"
KEY_WINDOW_GEOMETRY = "ui/windowGeometry"
KEY_WINDOW_STATE = "ui/windowState"
KEY_HYDRO_DENSITY = "calc/waterDensity"
KEY_LOG_LEVEL = "system/logLevel"


def get_settings() -> QSettings:
    """Retorna la instancia de QSettings de la aplicación."""
    return QSettings(ORG_NAME, APP_NAME)


def get_language() -> str:
    s = get_settings()
    return s.value(KEY_LANGUAGE, "es")


def set_language(lang: str) -> None:
    s = get_settings()
    s.setValue(KEY_LANGUAGE, lang)


def get_theme() -> str:
    s = get_settings()
    return s.value(KEY_THEME, "dark")


def set_theme(theme: str) -> None:
    s = get_settings()
    s.setValue(KEY_THEME, theme)


def get_units() -> str:
    """'si' o 'imperial'"""
    s = get_settings()
    return s.value(KEY_UNITS, "si")


def set_units(units: str) -> None:
    s = get_settings()
    s.setValue(KEY_UNITS, units)


def get_recent_files() -> list[str]:
    s = get_settings()
    val = s.value(KEY_RECENT_FILES, [])
    if isinstance(val, str):
        return [val]
    return list(val) if val else []


def add_recent_file(path: str) -> None:
    s = get_settings()
    recent = get_recent_files()
    if path in recent:
        recent.remove(path)
    recent.insert(0, path)
    max_recent = int(s.value(KEY_MAX_RECENT, 10))
    recent = recent[:max_recent]
    s.setValue(KEY_RECENT_FILES, recent)


def get_water_density() -> float:
    """Densidad del agua de mar en kg/m³ (por defecto 1025)."""
    s = get_settings()
    return float(s.value(KEY_HYDRO_DENSITY, 1025.0))


def get_log_level() -> str:
    s = get_settings()
    return s.value(KEY_LOG_LEVEL, "INFO")