#!/usr/bin/env bash
# cross-verify.sh — run both SAMA v2 verifiers (TS via Bun, shell
# via this directory's `sama check`) and assert their verdicts
# agree. The /goal demands "verdicts identical" — comparing the
# overall pass-count per check is the right granularity: violation
# strings differ in wording but the agreement claim is about which
# checks pass/fail.
#
# Exit 0 if both produce 7/7 ✓ (or any identical N/7 verdict);
# exit 1 if they diverge. Designed for CI hook + manual use.
#
# Usage:
#   tools/sama-cli/cross-verify.sh           # verify the main repo
#   tools/sama-cli/cross-verify.sh --self    # verify tools/sama-cli/src

set -u

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]:-$0}")/../.." && pwd)"
SAMA_CLI_DIR="$REPO_ROOT/tools/sama-cli"

mode="main"
if [ "${1:-}" = "--self" ]; then
  mode="self"
fi

echo "── cross-verify: SAMA v2 (TS vs shell) — target: $mode ──"

ts_verdict=""
sh_verdict=""

if [ "$mode" = "main" ]; then
  # Main repo: TS verifier runs against ./src with ./sama.profile.toml.
  cd "$REPO_ROOT" || exit 2
  ts_verdict="$(bun run "$SAMA_CLI_DIR/run-ts-verifier.ts" 2>&1 | tail -1)"
  sh_verdict="$("$SAMA_CLI_DIR/sama" check --summary 2>&1 | grep -oE '[0-9]+ / 7' | tail -1)"
else
  # Self mode: only the shell verifier can verify its own .sh tree —
  # the TS verifier hard-codes .ts. So "agreement" here is one-sided
  # (shell vs spec). We still emit the verdict for the record.
  ts_verdict="(n/a — TS verifier is .ts-only)"
  sh_verdict="$("$SAMA_CLI_DIR/sama" check \
    --profile="$SAMA_CLI_DIR/sama.profile.toml" \
    --src="$SAMA_CLI_DIR/src" --summary 2>&1 \
    | grep -oE '[0-9]+ / 7' | tail -1)"
fi

# Extract just the verdict line from main mode if it has extra text.
sh_pass_count="$(echo "$sh_verdict" | grep -oE '^[0-9]+' | head -1)"
ts_pass_count="$(echo "$ts_verdict" | grep -oE '^[0-9]+' | head -1)"

printf "  TS verifier  : %s\n" "$ts_verdict"
printf "  Shell verifier: %s\n" "$sh_verdict"
echo

if [ "$mode" = "self" ]; then
  if [ "$sh_pass_count" = "7" ]; then
    echo "✓ self-conformance: shell verifier 7/7 against its own source tree"
    exit 0
  else
    echo "✗ self-conformance: shell verifier ${sh_verdict} — should be 7/7"
    exit 1
  fi
fi

if [ -z "$ts_pass_count" ] || [ -z "$sh_pass_count" ]; then
  echo "✗ cross-verify: one verdict missing — TS=\`$ts_verdict\` shell=\`$sh_verdict\`"
  exit 1
fi

if [ "$ts_pass_count" = "$sh_pass_count" ]; then
  echo "✓ empirical agreement: both verifiers report ${sh_pass_count}/7"
  if [ "$sh_pass_count" = "7" ]; then
    echo "  — two independent implementations of the SAMA v2 §4 spec agree on 7/7 ✓"
  fi
  exit 0
fi

echo "✗ DISAGREEMENT — TS says $ts_pass_count/7, shell says $sh_pass_count/7"
echo "  This is a §6 evolution-policy pressure point: the spec admits"
echo "  multiple readings here. Resolve via prose, update both verifiers,"
echo "  re-run. See /sama/v2 §6 for the evolution mechanism."
exit 1