#!/bin/sh
# functions.sh — Shared utility functions for KubeSolo OS init
# Sourced by /sbin/init before running stages
# POSIX sh only — must work with BusyBox ash

# Wait for a block device to appear
wait_for_device() {
    dev="$1"
    timeout="${2:-30}"
    i=0
    while [ "$i" -lt "$timeout" ]; do
        [ -b "$dev" ] && return 0
        sleep 1
        i=$((i + 1))
    done
    return 1
}

# Wait for a file to appear
wait_for_file() {
    path="$1"
    timeout="${2:-30}"
    i=0
    while [ "$i" -lt "$timeout" ]; do
        [ -f "$path" ] && return 0
        sleep 1
        i=$((i + 1))
    done
    return 1
}

# Get IP address of an interface (POSIX-safe, no grep -P)
get_iface_ip() {
    iface="$1"
    ip -4 addr show "$iface" 2>/dev/null | \
        sed -n 's/.*inet \([0-9.]*\).*/\1/p' | head -1
}

# Check if running in a VM (useful for adjusting timeouts)
is_virtual() {
    [ -d /sys/class/dmi/id ] && \
        grep -qi -e 'qemu' -e 'kvm' -e 'vmware' -e 'virtualbox' -e 'xen' -e 'hyperv' \
            /sys/class/dmi/id/sys_vendor 2>/dev/null
}

# Resolve a LABEL= or UUID= device spec to a block device path
resolve_device() {
    spec="$1"
    case "$spec" in
        LABEL=*) blkid -L "${spec#LABEL=}" 2>/dev/null ;;
        UUID=*)  blkid -U "${spec#UUID=}" 2>/dev/null ;;
        *)       echo "$spec" ;;
    esac
}

# Write a key=value pair to a simple config file
config_set() {
    file="$1" key="$2" value="$3"
    if grep -q "^${key}=" "$file" 2>/dev/null; then
        sed -i "s|^${key}=.*|${key}=${value}|" "$file"
    else
        echo "${key}=${value}" >> "$file"
    fi
}

# Read a value from a simple key=value config file
config_get() {
    file="$1" key="$2" default="${3:-}"
    if [ -f "$file" ]; then
        value=$(sed -n "s/^${key}=//p" "$file" | tail -1)
        echo "${value:-$default}"
    else
        echo "$default"
    fi
}