#!/usr/bin/env bash
# retention-verify-archive.sh — retention piece 1 (board bug b67084660385).
# Verifies one archive file: checksum, integrity, clean listing, spot-extract.
# Usage: retention-verify-archive.sh <path-to-.jsonl.gz-or-.jsonl>
# Exits non-zero on any verification failure. Missing file = SKIP (rc 0).
set -uo pipefail

fail() { echo "FAIL verify $1: $2"; exit 1; }

P="${1:?usage: $0 <archive-path>}"

if [ ! -f "$P" ]; then
  echo "SKIP verify: $P does not exist"
  exit 0
fi

echo "== verify $P =="

# 1. checksum sidecar
if [ -f "$P.sha256" ]; then
  ( cd "$(dirname "$P")" && sha256sum -c "$(basename "$P").sha256" ) \
    || fail "$P" "sha256 mismatch"
  echo "  checksum: OK"
else
  echo "  checksum: no sidecar (archiver writes one for new .gz files)"
fi

# 2. integrity + clean listing for gzip archives
if [[ "$P" == *.gz ]]; then
  gzip -t "$P" || fail "$P" "gzip integrity test failed"
  echo "  integrity: gzip -t OK"
  echo "  listing:"; gzip -l "$P" | sed 's/^/    /'
  reader="zcat"
else
  reader="cat"
fi

# 3. spot-extract: first 3 and last 3 lines must be valid JSON
n=0
while IFS= read -r line; do
  n=$((n+1))
  echo "$line" | python3 -c 'import json,sys; json.loads(sys.stdin.read())' \
    || fail "$P" "line $n is not valid JSON"
done < <( { $reader "$P" | head -3; $reader "$P" | tail -3; } 2>/dev/null )

total="$( $reader "$P" | wc -l )"
echo "  spot-extract: first/last 3 lines valid JSON ($total total lines)"

# 4. spot-extract timestamps: report newest/oldest ts seen in the sample
sample="$($reader "$P" | head -2000)"
ts_line="$(echo "$sample" | python3 -c '
import json,sys
keys=("ts","timestamp","time","created_at","sent_at","resolved_at")
seen=[]
for line in sys.stdin:
    line=line.strip()
    if not line: continue
    try: rec=json.loads(line)
    except Exception: continue
    for k in keys:
        if rec.get(k): seen.append(str(rec[k])); break
seen=sorted(set(seen))
print(("oldest="+seen[0]+" newest="+seen[-1]) if seen else "no-ts-field")
')"
echo "  timestamps: $ts_line"

echo "OK verify $P"