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

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$ROOT"

ts="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
safe_ts="$(date -u +"%Y-%m-%dT%H-%M-%SZ")"
note="${1:-}"

mkdir -p out/checkpoints

echo "== running ci ==" >&2
ci_json="$(./scripts/ci.sh)"
echo "$ci_json" > "out/checkpoints/ci_${safe_ts}.json"

tar_path="out/checkpoints/iftypeset_checkpoint_${safe_ts}.tar.gz"

echo "== creating snapshot ${tar_path} ==" >&2
tar \
  --exclude=".git" \
  --exclude=".venv" \
  --exclude="out" \
  -czf "$tar_path" \
  .forgejo .gitignore README.md STATUS.md app docs fixtures forgejo pyproject.toml requirements.txt scripts spec src tests tools

sha="$(sha256sum "$tar_path" | awk '{print $1}')"

cat > "out/checkpoints/checkpoint_${safe_ts}.md" <<EOF
# iftypeset checkpoint

- timestamp_utc: ${ts}
- snapshot: ${tar_path}
- snapshot_sha256: ${sha}
- ci: \`out/checkpoints/ci_${safe_ts}.json\`
$( [ -n "${note}" ] && printf -- "- note: %s\n" "${note}" )

EOF

if [ ! -s docs/CHECKPOINTS.md ]; then
  cat > docs/CHECKPOINTS.md <<'EOF'
# Checkpoints

Durable restore points for this repo (useful when chat context resets).

How to create a checkpoint:

- `./scripts/checkpoint.sh "short note about what changed"`

Each entry records the snapshot tarball path + sha256 and the CI JSON for that moment.
EOF
fi

cat >> docs/CHECKPOINTS.md <<EOF

## ${ts}

- snapshot: \`${tar_path}\`
- snapshot_sha256: \`${sha}\`
- ci_json: \`out/checkpoints/ci_${safe_ts}.json\`
$( [ -n "${note}" ] && printf -- "- note: %s\n" "${note}" )

EOF

echo "checkpoint complete: ${tar_path} (sha256=${sha})" >&2