#!/usr/bin/env bash
# OrionOS ISO builder — run this on your Mac to produce a bootable ISO.
# Requires: Docker Desktop (https://docker.com/products/docker-desktop)
#
# Usage: ./build-iso.sh
# Output: dist/orionos-<date>.iso
set -euo pipefail

REPO="$(cd "$(dirname "$0")" && pwd)"
DIST="$REPO/dist"
IMAGE="orionos-builder"
ISO_TAG="orionos-$(date +%Y%m%d)"

# ── preflight ─────────────────────────────────────────────────────────
if ! command -v docker &>/dev/null; then
    echo ""
    echo "  Docker is not installed."
    echo ""
    echo "  Install Docker Desktop for Mac:"
    echo "  https://www.docker.com/products/docker-desktop/"
    echo ""
    echo "  After installing, open Docker Desktop once to let it start,"
    echo "  then re-run this script."
    exit 1
fi

if ! docker info &>/dev/null; then
    echo ""
    echo "  Docker is installed but not running."
    echo "  Open Docker Desktop and wait for it to start, then re-run."
    exit 1
fi

echo ""
echo "┌─────────────────────────────────────────────┐"
echo "│          OrionOS ISO Builder                  │"
echo "│  Building a BeOS-inspired Linux desktop...  │"
echo "└─────────────────────────────────────────────┘"
echo ""

# ── build the builder image ───────────────────────────────────────────
echo "Step 1/3: Building Docker image (downloads ~600MB Arch base, once)"
echo "          This will be fast on subsequent runs."
echo ""
docker build \
    --platform linux/amd64 \
    -t "$IMAGE" \
    -f "$REPO/iso/docker/Dockerfile" \
    "$REPO"

# ── run the ISO build inside the container ────────────────────────────
echo ""
echo "Step 2/3: Building ISO inside Arch Linux container..."
echo "          (5–15 min depending on internet speed and CPU)"
echo ""
mkdir -p "$DIST"
docker run \
    --rm \
    --privileged \
    --platform linux/amd64 \
    --security-opt seccomp=unconfined \
    -v "$DIST:/dist" \
    -e DIST=/dist \
    "$IMAGE"

# ── rename with date tag ──────────────────────────────────────────────
echo ""
echo "Step 3/3: Finalizing..."
ISO="$(find "$DIST" -name "orionos*.iso" | head -1)"
if [[ -z "$ISO" ]]; then
    echo "ERROR: ISO not found in $DIST — check the build output above."
    exit 1
fi

FINAL="$DIST/$ISO_TAG.iso"
mv "$ISO" "$FINAL"

SIZE="$(du -sh "$FINAL" | cut -f1)"

echo ""
echo "┌─────────────────────────────────────────────┐"
echo "│  Done!                                      │"
echo "│                                             │"
echo "│  ISO: dist/$ISO_TAG.iso"
echo "│  Size: $SIZE"
echo "│                                             │"
echo "│  Flash to USB:                              │"
echo "│    sudo dd if=$FINAL of=/dev/diskN bs=4m   │"
echo "│    (replace /dev/diskN with your USB drive) │"
echo "│                                             │"
echo "│  Or use Balena Etcher (GUI):                │"
echo "│    https://etcher.balena.io                 │"
echo "└─────────────────────────────────────────────┘"
echo ""