#! /bin/bash

set -e

# Mount the proc kernel temp mount
busybox mount -n -t proc     proc     /proc

# Check if bootloader wants the hook to be executed

BOOT_PARAM="$(busybox grep -o 'boot=[^ ]*' /proc/cmdline | busybox awk -F= '{print $2}')"

if [[ $BOOT_PARAM != "live" ]]
then
    exit 0
fi

VTOY_ISO_NAME_PARAM="$(busybox grep -o 'VTOY_ISO_NAME=[^ ]*' /proc/cmdline | busybox awk -F= '{print $2}')"

busybox echo '[PikaOS Booster Live Hook]: boot=live detected in kernel cmdline, running LiveISO hooks...'

### Create mounting dirs
busybox echo '[PikaOS Booster Live Hook]: Creating mountpoints...'
busybox mkdir -p /mnt/medium /mnt/filesystem /mnt/overlay /booster.root

# Try finding Appended partition among standard partition blocks.
busybox echo '[PikaOS Booster Live Hook]: Searching for Live medium...'
LIVE_MEDIA="$(busybox blkid | busybox grep "PikaOS 4" | busybox grep "iso9660" | busybox head -n1 | busybox awk -F: '{print $1}')"

if [ -z "$LIVE_MEDIA" ]
then
    # Try getting appended partition from Ventoy ISO Partition
    busybox echo '[PikaOS Booster Live Hook]: Live medium could not be found among standard blocks.'
    busybox echo '[PikaOS Booster Live Hook]: Attempting Ventoy mapping hook.'
    # Get Ventoy ISO Partition ID
    VENTOY_DEVICE="$(busybox blkid | busybox grep "Ventoy" | busybox head -n1 | busybox awk -F: '{print $1}')"
    # Keep retrying 10 times incase usb_storage has yet to pick up
    while [ -z "$VENTOY_DEVICE" ]
    do
        busybox echo '[PikaOS Booster Live Hook]: Ventoy Device not found retrying...'
        VENTOY_DEVICE="$(busybox blkid | busybox grep "Ventoy" | busybox head -n1 | busybox awk -F: '{print $1}')"
        ((c++)) && ((c==10)) && break
        sleep 5
    done
    # Get filesystem if iso was found
    if [ ! -z "$VENTOY_DEVICE" ]
    then
        busybox echo "[PikaOS Booster Live Hook]: Ventoy device found as $VENTOY_DEVICE !"
        busybox mkdir -p /mnt/ventoy
        busybox mount -o ro "$VENTOY_DEVICE" /mnt/ventoy
        ### Mount live medium
        busybox echo '[PikaOS Booster Live Hook]: Mounting Live medium...'
        busybox mount -o ro,loop /mnt/ventoy/$VTOY_ISO_NAME_PARAM /mnt/medium
    else
        busybox echo '[PikaOS Booster Live Hook]: Error: Live medium could not be found!'
        exit 32
    fi
else
    busybox echo "[PikaOS Booster Live Hook]: Live medium found on $LIVE_MEDIA !"
    ### Mount live medium
    busybox echo '[PikaOS Booster Live Hook]: Mounting Live medium...'
    busybox mount -o ro $LIVE_MEDIA /mnt/medium
fi

### Create loop from squashfs
busybox echo '[PikaOS Booster Live Hook]: Mounting Live medium squashfs image...'
busybox mount -o loop,ro /mnt/medium/live/filesystem.squashfs /mnt/filesystem

### Mount tmpfs on ram
busybox echo '[PikaOS Booster Live Hook]: Creating Ramfs...'
busybox mount -t tmpfs -o mode=1777 overlay_tmpfs /mnt/overlay

### Create overlay dirs
busybox mkdir -p /mnt/overlay/upper /mnt/overlay/work

### Create merged overlay
busybox echo '[PikaOS Booster Live Hook]: Creating writable overlay Rootfs on ramfs...'
busybox mount -t overlay overlay -o lowerdir=/mnt/filesystem:/mnt/medium,upperdir=/mnt/overlay/upper,workdir=/mnt/overlay/work /booster.root