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

# CASAN Plan-10 — Traceability REQ→code→test MVP tests.
#
# Proves the matrix is generated from the real requirement document and the gate
# fails when any FR loses test coverage.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
PROJECT_ROOT="$CASAN_APP_ROOT"
S="$CASAN_HARNESS_ROOT/scripts/bash"
WORK="$(mktemp -d)"
trap 'rm -rf "$WORK"' EXIT

PASS=0; FAIL=0
pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }

REQ="$CASAN_DOMAIN_ROOT/input/okr-requirement.md"
MAP="$CASAN_DOMAIN_ROOT/traceability-map.json"
OUT="$WORK/traceability-matrix.json"

echo "===== Plan-10 traceability matrix ====="
if python3 "$S/traceability-matrix.py" --requirements "$REQ" --map "$MAP" --out "$OUT" --gate >/dev/null 2>"$WORK/pass.err"; then
  pass "complete FR→code→test matrix passes gate"
else
  cat "$WORK/pass.err"
  fail "complete traceability matrix rejected"
fi

COUNT="$(python3 -c "import json;d=json.load(open('$OUT'));print(d['summary']['requirements'])" 2>/dev/null)"
FAILED="$(python3 -c "import json;d=json.load(open('$OUT'));print(d['summary']['failed'])" 2>/dev/null)"
[[ "$COUNT" == "5" && "$FAILED" == "0" ]] \
  && pass "matrix captures all 5 FRs with zero failures" \
  || fail "matrix summary unexpected (requirements=$COUNT failed=$FAILED)"

BROKEN="$WORK/traceability-map-broken.json"
python3 - "$MAP" "$BROKEN" <<'PY'
import json, sys
d = json.load(open(sys.argv[1]))
d["FR-04"]["tests"] = []
json.dump(d, open(sys.argv[2], "w"), indent=2)
PY
set +e
python3 "$S/traceability-matrix.py" --requirements "$REQ" --map "$BROKEN" --out "$WORK/broken.json" --gate >/dev/null 2>"$WORK/broken.err"
RC=$?
set -e 2>/dev/null || true
[[ "$RC" -eq 1 ]] && grep -q "TRACEABILITY_FAIL FR-04" "$WORK/broken.err" \
  && pass "missing FR test coverage fails the gate" \
  || fail "missing test coverage did not fail as expected (rc=$RC)"

echo ""
echo "===== Plan-10 symbol/line-level traceability ====="
# The real map carries symbol refs for FR-01 (AuthService, login); the passing
# run above wrote $OUT from the real map, so those symbols must resolve.
SYM_FOUND="$(python3 -c "import json;print(json.load(open('$OUT'))['summary']['symbols_found'])" 2>/dev/null)"
SYM_MISS="$(python3 -c "import json;print(json.load(open('$OUT'))['summary']['symbols_missing'])" 2>/dev/null)"
[[ "${SYM_FOUND:-0}" -ge 2 && "${SYM_MISS:-1}" -eq 0 ]] \
  && pass "real map symbol refs resolved (found=$SYM_FOUND missing=$SYM_MISS)" \
  || fail "real map symbol refs unexpected (found=$SYM_FOUND missing=$SYM_MISS)"

SYMBROKEN="$WORK/map-badsym.json"
python3 - "$MAP" "$SYMBROKEN" <<'PY'
import json, sys
d = json.load(open(sys.argv[1]))
d["FR-01"]["code"] = [{"file": "backend/src/auth/auth.service.ts", "symbols": ["NoSuchSymbolXYZ"]}]
json.dump(d, open(sys.argv[2], "w"), indent=2)
PY
set +e
python3 "$S/traceability-matrix.py" --requirements "$REQ" --map "$SYMBROKEN" --out "$WORK/badsym.json" --gate >/dev/null 2>"$WORK/badsym.err"
RC=$?
set -e 2>/dev/null || true
[[ "$RC" -eq 1 ]] && grep -q "missing_symbols=1" "$WORK/badsym.err" \
  && pass "missing symbol fails the gate (symbol-level)" \
  || fail "missing symbol did not fail as expected (rc=$RC)"

LINEBROKEN="$WORK/map-badline.json"
python3 - "$MAP" "$LINEBROKEN" <<'PY'
import json, sys
d = json.load(open(sys.argv[1]))
d["FR-01"]["code"] = [{"file": "backend/src/auth/auth.service.ts", "lines": [999999]}]
json.dump(d, open(sys.argv[2], "w"), indent=2)
PY
set +e
python3 "$S/traceability-matrix.py" --requirements "$REQ" --map "$LINEBROKEN" --out "$WORK/badline.json" --gate >/dev/null 2>"$WORK/badline.err"
RC=$?
set -e 2>/dev/null || true
[[ "$RC" -eq 1 ]] && grep -q "missing_lines=1" "$WORK/badline.err" \
  && pass "out-of-range line ref fails the gate (line-level)" \
  || fail "line ref did not fail as expected (rc=$RC)"

echo ""
echo "===== TRACEABILITY SUMMARY: PASS=$PASS FAIL=$FAIL ====="
[[ "$FAIL" -eq 0 ]] || exit 1