#!/bin/bash
# First-boot: packages, Chromium kiosk, rpd-labwc + touch, reTerminal DM drivers.
# Run by cloud-init (user-data-remote-gnss.example). Run as root.

set -e
export DEBIAN_FRONTEND=noninteractive

# --- Constants ---
# All first-boot assets live in portal-files/first-boot/ on the file server.
FILE_SERVER="http://10.130.60.141:5000/files/first-boot"
HOSTNAME="gnss.guard"
PI_USER="pi"
PI_HOME="/home/$PI_USER"
AUTOSTART="$PI_HOME/.config/autostart"
LOGFILE="/var/log/first-boot.log"
PLYMOUTH_DIR="/usr/share/plymouth/themes/custom"
WALLPAPER_PATH="/usr/share/rpd-wallpaper/splash.png"

# --- Logging ---
log() { echo "[$(date -Iseconds)] $*"; }
exec > >(tee -a "$LOGFILE") 2>&1
log "=== first-boot.sh started ==="
log "FILE_SERVER=$FILE_SERVER PI_USER=$PI_USER LOGFILE=$LOGFILE"

# --- 0. Hostname and /etc/hosts (avoids "unable to resolve host" with sudo) ---
log "--- Hostname: $HOSTNAME ---"
echo "$HOSTNAME" > /etc/hostname
hostnamectl set-hostname "$HOSTNAME" 2>/dev/null || true
# Ensure hostname resolves so sudo and other tools don't warn
if ! grep -q "127.0.1.1[[:space:]]*$HOSTNAME" /etc/hosts 2>/dev/null; then
  sed -i "/127.0.1.1[[:space:]].*$/d" /etc/hosts
  echo "127.0.1.1	$HOSTNAME" >> /etc/hosts
fi
log "Hostname set to $HOSTNAME; /etc/hosts updated"

# --- Helpers ---
# Download script + .desktop from FILE_SERVER and install as one-shot autostart (runs once at pi's first login, then deletes itself).
install_oneshot() {
  local name="$1"
  log "--- Installing one-shot: $name ---"
  if curl -fsSL "${FILE_SERVER}/${name}.sh" -o "$PI_HOME/${name}.sh"; then
    log "Downloaded ${name}.sh to $PI_HOME/${name}.sh"
  else
    log "WARNING: Could not download ${name}.sh"; return 1
  fi
  if curl -fsSL "${FILE_SERVER}/${name}.desktop" -o "$AUTOSTART/${name}.desktop"; then
    log "Downloaded ${name}.desktop to $AUTOSTART/${name}.desktop"
  else
    log "WARNING: Could not download ${name}.desktop"; return 1
  fi
  chmod 755 "$PI_HOME/${name}.sh" && chmod 644 "$AUTOSTART/${name}.desktop"
  chown "$PI_USER:$PI_USER" "$PI_HOME/${name}.sh" "$AUTOSTART/${name}.desktop"
  log "One-shot $name installed (will run at first login and then remove itself)"
}

# --- 1. Packages ---
log "--- Installing packages ---"
log "Running apt-get update ..."
apt-get update -qq
log "Installing: git chromium wmctrl openssh-server swaybg wlr-randr maliit-keyboard xinput-calibrator"
apt-get install -y -qq git chromium wmctrl openssh-server \
  swaybg wlr-randr maliit-keyboard xinput-calibrator
log "Packages installed successfully"

# --- 2. Dirs and kiosk files from file server ---
log "--- Kiosk files ---"
log "Creating $AUTOSTART"
mkdir -p "$AUTOSTART"
log "Downloading start-chromium.sh from ${FILE_SERVER}/start-chromium.sh"
curl -fsSL "${FILE_SERVER}/start-chromium.sh" -o "$PI_HOME/start-chromium.sh"
log "Downloading chromium-kiosk.desktop from ${FILE_SERVER}/chromium-kiosk.desktop"
curl -fsSL "${FILE_SERVER}/chromium-kiosk.desktop" -o "$AUTOSTART/chromium-kiosk.desktop"
chmod 755 "$PI_HOME/start-chromium.sh" && chmod 644 "$AUTOSTART/chromium-kiosk.desktop"
chown -R "$PI_USER:$PI_USER" "$PI_HOME/start-chromium.sh" "$AUTOSTART/chromium-kiosk.desktop"
log "Kiosk files installed under $PI_HOME and $AUTOSTART"

# --- 3. Boot splash and wallpaper (splash.png + Plymouth theme from file server) ---
log "--- Boot splash and wallpaper ---"
log "Creating $PLYMOUTH_DIR and /usr/share/rpd-wallpaper"
mkdir -p "$PLYMOUTH_DIR" /usr/share/rpd-wallpaper
if curl -fsSL "${FILE_SERVER}/splash.png" -o "$PLYMOUTH_DIR/splash.png"; then
  log "Downloaded splash.png; copying to $WALLPAPER_PATH"
  cp "$PLYMOUTH_DIR/splash.png" "$WALLPAPER_PATH"
  chmod 644 "$PLYMOUTH_DIR/splash.png" "$WALLPAPER_PATH"
  if curl -fsSL "${FILE_SERVER}/custom.plymouth" -o "$PLYMOUTH_DIR/custom.plymouth" \
     && curl -fsSL "${FILE_SERVER}/custom.script" -o "$PLYMOUTH_DIR/custom.script"; then
    chmod 644 "$PLYMOUTH_DIR/custom.plymouth" "$PLYMOUTH_DIR/custom.script"
    log "Plymouth theme files (custom.plymouth, custom.script) installed"
  else
    log "WARNING: Could not download custom.plymouth/custom.script; boot splash theme may be incomplete"
  fi
  grep -q '^Theme=custom' /etc/plymouth/plymouthd.conf 2>/dev/null || printf '%s\n' '[Daemon]' 'Theme=custom' >> /etc/plymouth/plymouthd.conf
  log "Running update-initramfs (may take a moment) ..."
  update-initramfs -u -k all 2>/dev/null || true
  mkdir -p /etc/lightdm/lightdm.conf.d
  curl -fsSL "${FILE_SERVER}/99-wallpaper.conf" -o /etc/lightdm/lightdm.conf.d/99-wallpaper.conf 2>/dev/null || log "WARNING: Could not download 99-wallpaper.conf"
  log "Splash and wallpaper set from file server"
else
  log "WARNING: Could not download splash.png"
fi

# --- 4. LightDM: rpd-labwc session + configs from file server ---
log "--- LightDM session (rpd-labwc) ---"
mkdir -p /etc/lightdm/lightdm.conf.d
if curl -fsSL "${FILE_SERVER}/99-default-session.conf" -o /etc/lightdm/lightdm.conf.d/99-default-session.conf 2>/dev/null; then
  log "99-default-session.conf installed"
else
  log "WARNING: Could not download 99-default-session.conf"
fi
# Raspberry Pi OS may apply main lightdm.conf after .conf.d; force session in main config too
if [[ -f /etc/lightdm/lightdm.conf ]]; then
  sed -i 's/^user-session=.*/user-session=rpd-labwc/' /etc/lightdm/lightdm.conf
  sed -i 's/^autologin-session=.*/autologin-session=rpd-labwc/' /etc/lightdm/lightdm.conf
  log "Patched /etc/lightdm/lightdm.conf to use rpd-labwc"
fi

# --- 5. Maliit on-screen keyboard (from file server) ---
log "--- Maliit ---"
mkdir -p "$AUTOSTART" "$PI_HOME/.config"
curl -fsSL "${FILE_SERVER}/maliit-keyboard.desktop" -o "$AUTOSTART/maliit-keyboard.desktop" 2>/dev/null && log "maliit-keyboard.desktop installed" || log "WARNING: Could not download maliit-keyboard.desktop"
chown -R "$PI_USER:$PI_USER" "$PI_HOME/.config"

# --- 6. reTerminal DM drivers (Seeed) ---
log "--- reTerminal DM drivers ---"
REPO_DIR="/tmp/seeed-linux-dtoverlays"
log "Cloning seeed-linux-dtoverlays to $REPO_DIR ..."
git clone --depth 1 https://github.com/Seeed-Studio/seeed-linux-dtoverlays "$REPO_DIR"
# Script must run from repo root (it uses pwd for MOD_PATH). On bookworm+ --compat-kernel is not supported.
log "Running reTerminal.sh --device reTerminal-DM from $REPO_DIR ..."
if ( cd "$REPO_DIR" && "$REPO_DIR/scripts/reTerminal.sh" --device reTerminal-DM ); then
  log "reTerminal DM drivers installed (reboot will apply)"
else
  log "WARNING: reTerminal.sh failed (see log above). Display/touch may still work; you can retry later with: cd $REPO_DIR && sudo ./scripts/reTerminal.sh --device reTerminal-DM"
fi
log "Removing $REPO_DIR"
rm -rf "$REPO_DIR"

# --- 6b. Re-apply splash and display (Seeed script sets disable_splash=1 and can duplicate Plymouth theme) ---
log "--- Re-applying boot splash and Plymouth theme ---"
CFG_PATH="/boot/firmware/config.txt"
[[ -f /boot/firmware/config.txt ]] || CFG_PATH="/boot/config.txt"
if [[ -f "$CFG_PATH" ]]; then
  if grep -q '^disable_splash=1' "$CFG_PATH"; then
    sed -i 's/^disable_splash=1$/disable_splash=0/' "$CFG_PATH"
    log "Set disable_splash=0 so Plymouth splash is shown"
  fi
fi
# Ensure Plymouth uses our custom theme only (remove Theme=pix, set Theme=custom)
if [[ -f /etc/plymouth/plymouthd.conf ]]; then
  sed -i '/^Theme=/d' /etc/plymouth/plymouthd.conf
  grep -q '^\[Daemon\]' /etc/plymouth/plymouthd.conf || echo '[Daemon]' >> /etc/plymouth/plymouthd.conf
  echo 'Theme=custom' >> /etc/plymouth/plymouthd.conf
  log "Plymouth theme set to custom only"
fi
log "Running update-initramfs to apply Plymouth theme ..."
update-initramfs -u -k all 2>/dev/null || true

# --- 6c. Boot order: network first, then eMMC/SD (for future network boot / re-provisioning) ---
# BOOT_ORDER: 0x2 = network, 0x1 = SD/eMMC. 0x21 = try network first, then local storage.
log "--- Boot order (network first, then eMMC/SD) ---"
if command -v rpi-eeprom-config >/dev/null 2>&1 && command -v rpi-eeprom-update >/dev/null 2>&1; then
  BOOTCONF="/tmp/first-boot-eeprom-conf.txt"
  if PEE="$(rpi-eeprom-update -l 2>/dev/null)" && [[ -n "$PEE" ]] && [[ -f "$PEE" ]]; then
    rpi-eeprom-config "$PEE" > "$BOOTCONF" 2>/dev/null || true
  fi
  if [[ -s "$BOOTCONF" ]]; then
    sed -i 's/^BOOT_ORDER=.*/BOOT_ORDER=0x21/' "$BOOTCONF"
    grep -q '^BOOT_ORDER=' "$BOOTCONF" || echo 'BOOT_ORDER=0x21' >> "$BOOTCONF"
    if rpi-eeprom-config --apply "$BOOTCONF" 2>/dev/null; then
      log "Boot order set to 0x21 (network first, then eMMC/SD); EEPROM update scheduled for next reboot"
    else
      log "WARNING: rpi-eeprom-config --apply failed; boot order unchanged"
    fi
  else
    log "WARNING: Could not read current EEPROM config; skipping boot order change"
  fi
  rm -f "$BOOTCONF"
else
  log "rpi-eeprom-config/rpi-eeprom-update not found; skipping boot order (not a Pi4/CM4 or package missing)"
fi

# --- 7. One-shots (rotation + wallpaper at first login) ---
log "--- One-shot scripts (run at pi first login) ---"
install_oneshot set-rotation-once || true
install_oneshot set-wallpaper-once || true
log "One-shots will append to $LOGFILE when they run at first login"

# --- 8. Allow pi to append to first-boot.log (for one-shot scripts) ---
chmod 666 "$LOGFILE"
log "Log file $LOGFILE is now appendable by user $PI_USER for one-shot scripts"

# --- 9. Reboot ---
log "=== first-boot.sh finished, rebooting ==="
reboot