#!/bin/bash
# lib/steps/singbox.sh — instalar/verificar sing-box

step_singbox() {
    print_section "sing-box"
    log_step "Checking sing-box binary" 4 $TOTAL_STEPS

    local found=""
    for candidate in /usr/bin/sing-box /usr/local/bin/sing-box /bin/sing-box; do
        [ -x "$candidate" ] && found="$candidate" && break
    done
    [ -z "$found" ] && found=$(command -v sing-box 2>/dev/null || true)

    if [ -n "$found" ]; then
        local ver
        ver=$("$found" version 2>/dev/null | head -1 || echo "unknown")
        log_ok "Encontrado: ${found}  (${ver})"
        if [ "$found" != "$SINGBOX_BIN" ]; then
            sudo ln -sf "$found" "$SINGBOX_BIN"
            log_ok "Symlink → ${SINGBOX_BIN}"
        fi
    else
        _install_singbox
    fi

    # setcap — sing-box crea TUN sin necesitar root completo
    if command -v setcap &>/dev/null; then
        sudo setcap cap_net_admin,cap_net_raw+ep "$SINGBOX_BIN"
        log_ok "setcap cap_net_admin,cap_net_raw+ep → ${SINGBOX_BIN}"
    else
        log_warn "setcap no disponible — sing-box necesitará sudo para TUN"
    fi

    log_ok "sing-box listo → ${SINGBOX_BIN}"
}

_install_singbox() {
    log_info "sing-box no encontrado — instalando v${SINGBOX_VERSION}..."

    local arch
    arch=$(uname -m)
    case "$arch" in
        x86_64)  arch="amd64" ;;
        aarch64) arch="arm64" ;;
        *)
            log_error "Arquitectura no soportada: ${arch}"
            exit 1
            ;;
    esac

    local url="https://github.com/SagerNet/sing-box/releases/download/v${SINGBOX_VERSION}/sing-box-${SINGBOX_VERSION}-linux-${arch}.tar.gz"
    local tmp_tar="/tmp/sing-box-$$.tar.gz"
    local tmp_dir="/tmp/sing-box-$$"

    start_spinner "Descargando sing-box v${SINGBOX_VERSION}..."
    if wget -q --timeout=60 "$url" -O "$tmp_tar"; then
        stop_spinner "Descarga completa"
    else
        stop_spinner
        rm -f "$tmp_tar"
        log_error "Descarga falló: ${url}"
        exit 1
    fi

    start_spinner "Extrayendo..."
    mkdir -p "$tmp_dir"
    tar -xzf "$tmp_tar" -C "$tmp_dir" --strip-components=1
    stop_spinner "Extraído"

    sudo cp "$tmp_dir/sing-box" "$SINGBOX_BIN"
    sudo chmod 755 "$SINGBOX_BIN"
    rm -rf "$tmp_tar" "$tmp_dir"
    log_ok "sing-box instalado: $($SINGBOX_BIN version | head -1)"
}