#!/bin/bash
#
# sync-bashrc-all.sh
#
# Skrip all-in-one:
#   1. Cek /etc/skel/.bashrc vs versi remote (gist) -> update kalau beda
#   2. Cek /etc/shell-prompt.sh vs versi remote (gist) -> download/update kalau
#      belum ada atau beda
#   3. Terapkan /etc/skel/.bashrc ke semua user existing di /home yang
#      .bashrc-nya belum sesuai
#
# Jalankan sebagai root: sudo bash sync-bashrc-all.sh

set -euo pipefail

BASHRC_URL="https://gist.darto.id/dartokloning/866220d4bda046fe93508ed50dac1965/download/HEAD/.bashrc"
PROMPT_URL="https://gist.darto.id/dartokloning/def50cb1b3024c3b8683960c873caf34/download/HEAD/shell-prompt.sh"

SKEL_BASHRC="/etc/skel/.bashrc"
PROMPT_FILE="/etc/shell-prompt.sh"

if [ "$(id -u)" -ne 0 ]; then
    echo "Skrip ini harus dijalankan sebagai root (pakai sudo)." >&2
    exit 1
fi

TMP_DIR="$(mktemp -d)"
trap 'rm -rf "$TMP_DIR"' EXIT

fetch() {
    # fetch URL DEST_TMPFILE -> berhenti dengan pesan jelas kalau gagal
    local url="$1" dest="$2"
    if ! wget -q -O "$dest" "$url"; then
        echo "Error: gagal download $url (cek koneksi internet)." >&2
        exit 1
    fi
}

echo "== 1. Cek /etc/skel/.bashrc =="
tmp_bashrc="$TMP_DIR/.bashrc"
fetch "$BASHRC_URL" "$tmp_bashrc"

if [ ! -f "$SKEL_BASHRC" ] || ! cmp -s "$tmp_bashrc" "$SKEL_BASHRC"; then
    cp "$tmp_bashrc" "$SKEL_BASHRC"
    echo "  -> $SKEL_BASHRC diperbarui dari gist."
else
    echo "  -> $SKEL_BASHRC sudah sesuai dengan gist, tidak ada perubahan."
fi

echo
echo "== 2. Cek /etc/shell-prompt.sh =="
tmp_prompt="$TMP_DIR/shell-prompt.sh"
fetch "$PROMPT_URL" "$tmp_prompt"

if [ ! -f "$PROMPT_FILE" ] || ! cmp -s "$tmp_prompt" "$PROMPT_FILE"; then
    cp "$tmp_prompt" "$PROMPT_FILE"
    chmod 644 "$PROMPT_FILE"
    echo "  -> $PROMPT_FILE diperbarui dari gist."
else
    echo "  -> $PROMPT_FILE sudah sesuai dengan gist, tidak ada perubahan."
fi

echo
echo "== 3. Terapkan template ke user existing di /home =="
for home_dir in /home/*/; do
    home_dir="${home_dir%/}"
    user="$(basename "$home_dir")"

    # skip kalau bukan user valid (mis. lost+found, direktori nyasar)
    if ! id "$user" >/dev/null 2>&1; then
        continue
    fi

    target="$home_dir/.bashrc"

    # kalau .bashrc user sudah identik dengan template skel, skip
    if [ -f "$target" ] && cmp -s "$SKEL_BASHRC" "$target"; then
        echo "[SKIP]   $user - .bashrc sudah sesuai template"
        continue
    fi

    # backup .bashrc lama, hanya sekali (tidak menimpa backup yang sudah ada)
    if [ -f "$target" ] && [ ! -f "$home_dir/.bashrc.original" ]; then
        cp -a "$target" "$home_dir/.bashrc.original"
        echo "[BACKUP] $user - .bashrc lama disimpan sebagai .bashrc.original"
    fi

    cp "$SKEL_BASHRC" "$target"
    chown "$user":"$user" "$target"
    echo "[APPLY]  $user - .bashrc diperbarui dari template skel"
done

echo
echo "Selesai."
echo "Catatan: user yang sedang login perlu 'source ~/.bashrc' atau login ulang"
echo "agar shell aktifnya ikut memakai .bashrc yang baru."