#!/usr/bin/env bash
# Covenant auto-snapshot + integrity gate (pre-push)
# - Blocks if archives violate append-only policy
# - Auto-evolves + commits checksums snapshot when changes are additive

set -euo pipefail

PY=${PYTHON:-python3}
BASE="belel-justice-covenant"
GEN="$BASE/tools/generate_checksums.py"
RES="$BASE/protocol_instructions/revisionism_resistor.py"
CHK="$BASE/signing/checksums.txt"
AUTO="${COVENANT_AUTO_EVOLVE:-1}"

echo "[pre-push] Covenant integrity gate…"

# 1) Enforce append-only integrity (blocks on destructive edits)
if [ -f "$RES" ]; then
  $PY "$RES"
fi

# 2) Verify checksums; if mismatched and AUTO_EVOLVE=1, roll + commit new snapshot
if [ -f "$GEN" ]; then
  if [ ! -f "$CHK" ]; then
    echo "[pre-push] No checksums baseline — generating…"
    $PY "$GEN"
    git add "$BASE/signing" || true
    git commit -m "Covenant: add baseline checksums snapshot [ci skip]" || true
  else
    set +e
    $PY "$GEN" --verify
    RC=$?
    set -e
    if [ $RC -ne 0 ]; then
      if [ "$AUTO" = "1" ]; then
        echo "[pre-push] Checksums outdated but integrity OK — auto-evolving…"
        $PY "$GEN" --evolve
        git add "$BASE/signing/checksums.txt" "$BASE/signing/snapshots" || true
        git commit -m "Covenant: auto-evolve snapshot for additive remembrance updates [ci skip]" || true
        $PY "$GEN" --verify
      else
        echo "[pre-push] ERROR: Checksums outdated. Run:"
        echo "  python $GEN --evolve && git add $BASE/signing && git commit -m 'Evolve covenant snapshot'"
        exit 1
      fi
    fi
  fi
fi

echo "[pre-push] OK."
exit 0