#!/usr/bin/env bash
set -euo pipefail

repo_root="$(git -C "$(dirname "${BASH_SOURCE[0]}")" rev-parse --show-toplevel)"
tool_dir="$repo_root/tools/quickshell-preview"
shell_root="$repo_root/dotfiles/quickshell"
image="homelab-quickshell-preview:qsmcp-76b1b008"

component="${1:-tests/HeadlessSmoke.qml}"
output="${2:-${TMPDIR:-/tmp}/homelab-quickshell-preview/smoke.png}"
width="${3:-720}"
height="${4:-120}"

if ! docker info >/dev/null 2>&1; then
    echo "error: Docker-compatible daemon is unavailable" >&2
    exit 69
fi

case "$output" in
    /*) ;;
    *) output="$PWD/$output" ;;
esac

output_dir="$(dirname "$output")"
output_name="$(basename "$output")"
mkdir -p "$output_dir"

container_id=""
cleanup() {
    if [[ -n "$container_id" ]]; then
        docker rm --force "$container_id" >/dev/null 2>&1 || true
    fi
}
trap cleanup EXIT

docker build --tag "$image" --file "$tool_dir/Dockerfile" "$tool_dir"

container_id="$(docker create \
    --network none \
    --tmpfs /tmp:rw,noexec,nosuid,size=256m \
    "$image" \
    "$component" \
    --width "$width" \
    --height "$height" \
    --dpr 1 \
    --padding 0 \
    --background solid \
    --bg '#0a0a0a' \
    --out "/output/$output_name")"

# docker cp streams files through the API, so this works with rootless and
# remote daemons whose filesystem cannot see the client's repository path.
docker cp "$shell_root/." "$container_id:/workspace/quickshell"
docker start --attach "$container_id"
docker cp "$container_id:/output/$output_name" "$output"

test -s "$output"
printf 'rendered=%s\n' "$output"