#!/usr/bin/env bash
# ===========================================================================
# FOSFENO :: lib.sh - funciones comunes para los scripts de instalacion
# Se carga con:  source "$(dirname "$0")/scripts/lib.sh"
# ===========================================================================

# --- Colores (se desactivan si la salida no es un terminal) ----------------
if [ -t 1 ]; then
  C_RED=$'\e[31m'; C_GRN=$'\e[32m'; C_YEL=$'\e[33m'
  C_CYA=$'\e[36m'; C_BLD=$'\e[1m'; C_RST=$'\e[0m'
else
  C_RED=''; C_GRN=''; C_YEL=''; C_CYA=''; C_BLD=''; C_RST=''
fi

# --- Logging ----------------------------------------------------------------
log_step() { printf '\n%s==> %s%s\n' "$C_CYA$C_BLD" "$*" "$C_RST"; }
log_ok()   { printf '   %s[ OK ]%s %s\n' "$C_GRN" "$C_RST" "$*"; }
log_warn() { printf '   %s[ !! ]%s %s\n' "$C_YEL" "$C_RST" "$*"; }
log_fail() { printf '   %s[ XX ]%s %s\n' "$C_RED" "$C_RST" "$*"; }
log_info() { printf '   %s-%s %s\n' "$C_CYA" "$C_RST" "$*"; }

# Contador global de errores no fatales
FOSFENO_WARNINGS=0
warn() { log_warn "$*"; FOSFENO_WARNINGS=$((FOSFENO_WARNINGS + 1)); }

# --- Versiones --------------------------------------------------------------
# ver_of "salida cualquiera v1.2.3 bla"  ->  "1.2.3"
ver_of() { printf '%s' "$1" | grep -oE '[0-9]+(\.[0-9]+){1,2}' | head -n1; }

# ver_ge "1.2.3" "1.2.0"  ->  exit 0 si  $1 >= $2
ver_ge() {
  [ "$1" = "$2" ] && return 0
  local menor
  menor=$(printf '%s\n%s\n' "$1" "$2" | sort -V | head -n1)
  [ "$menor" = "$2" ]
}

# require_version <nombre> <comando --version> <version_minima>
# Comprueba que un comando existe y cumple la version minima.
require_version() {
  local nombre="$1" cmd="$2" minima="$3" salida actual
  if ! command -v "${cmd%% *}" >/dev/null 2>&1; then
    log_fail "$nombre no esta instalado"
    return 1
  fi
  salida=$($cmd 2>&1 | head -n3)
  actual=$(ver_of "$salida")
  if [ -z "$actual" ]; then
    warn "$nombre instalado pero no se pudo leer la version"
    return 0
  fi
  if ver_ge "$actual" "$minima"; then
    log_ok "$nombre $actual  (minimo $minima)"
    return 0
  else
    log_fail "$nombre $actual es anterior al minimo requerido $minima"
    return 1
  fi
}

# --- Hardware ---------------------------------------------------------------
pi_model() {
  if [ -r /proc/device-tree/model ]; then
    tr -d '\0' < /proc/device-tree/model
  else
    echo "desconocido"
  fi
}

# --- Utilidades -------------------------------------------------------------
need_cmd() { command -v "$1" >/dev/null 2>&1; }