#!/usr/bin/env bash
# Regression test for the three STRUCTURAL claims the ADR-0020 gate family makes
# about itself. None of them was pinned anywhere before this file, and each one
# fails silently — which is the whole reason they need a test rather than a
# comment:
#
#   1. "ONE resolver, embedded VERBATIM in three scripts." The block between the
#      BEGIN/END markers is copied, not imported, because a cache-installed
#      plugin's scripts cannot read files outside their own plugin directory.
#      Nothing but this file asserts the three copies are still identical, and a
#      one-line edit to a single copy is invisible: every constant-agreement
#      assertion in tests/test-skill-size-check.sh still passes, because the
#      CONSTANTS are not what drifted.
#   2. Both interpreter preflights, in all three scripts. python3 and PyYAML are
#      declared HARD dependencies precisely so a missing one cannot turn into a
#      vacuous pass, and the two are checked separately so the message names the
#      thing to install rather than the wrong one.
#   3. `verbose: true` on the skill-size-check hook. It is the ENTIRE delivery
#      mechanism for the SUGGESTION tier: pre-commit prints nothing at all for a
#      passing hook, and a SUGGESTION deliberately does not fail, so dropping
#      one word from the config silences the tier ADR-0020 depends on while
#      every test and every hook still reports green.
set -euo pipefail

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
HOOK="$REPO_ROOT/scripts/skill-size-check.sh"
SKILL_VALIDATE="$REPO_ROOT/plugins/kyberforge/.apm/skills/skill-audit/scripts/validate.sh"
AGENT_VALIDATE="$REPO_ROOT/plugins/kyberforge/.apm/skills/agent-audit/scripts/validate.sh"
PASS=0
FAIL=0

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

TMPDIR_T="$(mktemp -d)"
trap 'rm -rf "$TMPDIR_T"' EXIT

BEGIN_MARKER='# ===== BEGIN ADR-0020 SHARED BOUNDARY RESOLVER ====='
END_MARKER='# ===== END ADR-0020 SHARED BOUNDARY RESOLVER ====='

# ---------------------------------------------------------------------------
# 1. The shared resolver block is byte-identical in all three scripts
# ---------------------------------------------------------------------------
echo ""
echo "--- the ADR-0020 shared resolver block is byte-identical in all three scripts ---"

# Marker discipline first. An unbalanced or duplicated marker pair makes the
# extraction below silently measure the wrong span — a sed range that never
# closes swallows the rest of the file, and one that opens twice concatenates
# two spans. Both would still compare "equal" if all three were mangled the
# same way, so the shape is asserted before the contents.
MARKERS_OK=true
for f in "$HOOK" "$SKILL_VALIDATE" "$AGENT_VALIDATE"; do
  if [[ ! -f "$f" ]]; then
    fail "script not found: $f"
    MARKERS_OK=false
    continue
  fi
  b="$(grep -cFx "$BEGIN_MARKER" "$f" || true)"
  e="$(grep -cFx "$END_MARKER" "$f" || true)"
  if [[ "$b" == "1" && "$e" == "1" ]]; then
    pass "${f#"$REPO_ROOT/"} carries exactly one BEGIN and one END marker"
  else
    fail "${f#"$REPO_ROOT/"} has $b BEGIN and $e END markers, expected 1 and 1"
    MARKERS_OK=false
  fi
done

if ! $MARKERS_OK; then
  fail "skipping the byte-identity comparison — the marker pairs are not well-formed, so any extraction would measure the wrong span"
else
  HASHES=()
  LINECOUNTS=()
  for f in "$HOOK" "$SKILL_VALIDATE" "$AGENT_VALIDATE"; do
    out="$TMPDIR_T/block-$(echo "$f" | md5sum | cut -c1-8).txt"
    sed -n "/^${BEGIN_MARKER}\$/,/^${END_MARKER}\$/p" "$f" > "$out"
    HASHES+=("$(md5sum < "$out" | cut -d' ' -f1)")
    LINECOUNTS+=("$(wc -l < "$out" | tr -d ' ')")
  done
  if [[ "${HASHES[0]}" == "${HASHES[1]}" && "${HASHES[1]}" == "${HASHES[2]}" ]]; then
    pass "all three copies hash to ${HASHES[0]} (${LINECOUNTS[0]} lines) — agreement by construction, not by coincidence"
  else
    fail "the shared resolver has DRIFTED: skill-size-check=${HASHES[0]} (${LINECOUNTS[0]} lines), skill-audit=${HASHES[1]} (${LINECOUNTS[1]} lines), agent-audit=${HASHES[2]} (${LINECOUNTS[2]} lines). Edit one copy, then paste it over the other two."
  fi
  # A block that has been emptied out would hash equal in all three and pass the
  # comparison above while enforcing nothing. The resolver is ~570 lines; 100 is
  # a floor low enough never to need maintenance and high enough that a gutted
  # block cannot sneak past.
  if [[ "${LINECOUNTS[0]}" -gt 100 ]]; then
    pass "the extracted block is ${LINECOUNTS[0]} lines — the comparison is over real content, not an empty span"
  else
    fail "the extracted shared block is only ${LINECOUNTS[0]} lines — three identical empty spans would compare equal and assert nothing"
  fi
fi

# ---------------------------------------------------------------------------
# 2. Both interpreter preflights, in all three scripts
# ---------------------------------------------------------------------------
# The two are checked separately on purpose: `python3 -c 'import yaml'` fails
# identically whether python3 is missing or PyYAML is, and naming the wrong one
# sends the reader to install the wrong thing.
REAL_PYTHON="$(command -v python3)"
# Absolute path, deliberately. The no-python3 fixture below replaces PATH
# wholesale, so a bare `bash` (or `/usr/bin/env bash`) would be resolved against
# that stripped PATH and die with "No such file or directory" before the script
# under test ever starts -- a 127 that looks like the preflight firing.
BASH_BIN="$(command -v bash)"

# A PATH that genuinely has no python3 on it. Built by symlinking the handful of
# binaries the three scripts touch before their own preflight rather than by
# hiding python3 from a full PATH, because there is no portable way to subtract
# one entry from a directory. `bash` is invoked by absolute path below so the
# interpreter itself does not have to be on this PATH.
NOPY_BIN="$TMPDIR_T/nopython-bin"
mkdir -p "$NOPY_BIN"
for b in awk cat cut dirname basename grep sed pwd rm mkdir tr; do
  src="$(command -v "$b" 2>/dev/null || true)"
  [[ -n "$src" ]] && ln -sf "$src" "$NOPY_BIN/$b"
done

# A python3 that runs but cannot import yaml. A shim on PATH re-execs the real
# interpreter with a PYTHONPATH entry holding a `yaml` module that raises on
# import; PYTHONPATH precedes site-packages on sys.path, so it shadows a real
# PyYAML install without touching it.
SHADOW="$TMPDIR_T/shadow"
mkdir -p "$SHADOW"
printf 'raise ImportError("PyYAML deliberately unavailable in this fixture")\n' \
  > "$SHADOW/yaml.py"
NOYAML_BIN="$TMPDIR_T/noyaml-bin"
mkdir -p "$NOYAML_BIN"
cat > "$NOYAML_BIN/python3" <<EOF
#!/bin/sh
PYTHONPATH="$SHADOW\${PYTHONPATH:+:\$PYTHONPATH}" exec "$REAL_PYTHON" "\$@"
EOF
chmod +x "$NOYAML_BIN/python3"

# Sanity-check the two fixtures themselves before trusting any verdict they
# produce. A shim that silently still imports yaml would make every PyYAML
# assertion below pass for the wrong reason.
if PATH="$NOYAML_BIN:$PATH" python3 -c 'import yaml' 2>/dev/null; then
  fail "the no-PyYAML shim does not actually shadow PyYAML — every PyYAML assertion below would be vacuous"
else
  pass "fixture check: the no-PyYAML shim makes 'import yaml' fail while python3 still runs"
fi
if PATH="$NOPY_BIN" command -v python3 > /dev/null 2>&1; then
  fail "the no-python3 PATH still resolves python3 — every python3 assertion below would be vacuous"
else
  pass "fixture check: the no-python3 PATH resolves no python3"
fi

# A minimal, entirely clean subject for each script. The preflight must fire
# before any measurement, so the subject's own content is irrelevant — which is
# exactly what makes a clean one the right choice: nothing else can produce the
# non-zero exit these cases assert.
SUBJECT_SKILL_DIR="$TMPDIR_T/subject/my-skill"
mkdir -p "$SUBJECT_SKILL_DIR"
cat > "$SUBJECT_SKILL_DIR/SKILL.md" <<'EOF'
---
name: my-skill
description: A short valid description. Do not use for anything else.
---

Do the thing.
EOF
SUBJECT_AGENT_ROOT="$TMPDIR_T/subject-agent"
mkdir -p "$SUBJECT_AGENT_ROOT/.apm/agents"
cat > "$SUBJECT_AGENT_ROOT/apm.yml" <<'EOF'
name: test-package
version: 0.1.0
type: skill
EOF
cat > "$SUBJECT_AGENT_ROOT/.apm/agents/my-agent.agent.md" <<'EOF'
---
name: my-agent
description: A short valid description. Do not use for anything else.
---

You are a test agent. When invoked, do the thing.
EOF

# probe_preflight <label> <env-kind: nopython|noyaml> <expect-needle> <cmd...>
probe_preflight() {
  local label="$1" kind="$2" needle="$3"
  shift 3
  local out status=0
  set +e
  if [[ "$kind" == nopython ]]; then
    out="$(env -i PATH="$NOPY_BIN" HOME="$HOME" "$BASH_BIN" "$@" 2>&1)"
  else
    out="$(env PATH="$NOYAML_BIN:$PATH" "$BASH_BIN" "$@" 2>&1)"
  fi
  status=$?
  set -e
  if [[ $status -eq 0 ]]; then
    fail "$label exited 0 — a missing hard dependency became a vacuous pass (output: ${out:-<empty>})"
  elif [[ "$out" != *"$needle"* ]]; then
    # The needle is the DIAGNOSTIC ("python3 is required"), not the bare word.
    # Deleting the preflight entirely would still produce a non-zero exit and a
    # message mentioning python3 -- bash's own "python3: command not found" --
    # so a bare-word needle would go green on a script with no preflight at all.
    fail "$label exited $status but never produced the '$needle' diagnostic (output: ${out:-<empty>})"
  elif [[ "$kind" == nopython && "$out" == *PyYAML* ]]; then
    fail "$label reported PyYAML when python3 itself is missing — that sends the reader to install the wrong thing (output: $out)"
  else
    pass "$label"
  fi
}

echo ""
echo "--- a PATH with no python3 is a hard failure in all three scripts, naming python3 ---"
probe_preflight "scripts/skill-size-check.sh reports missing python3" \
  nopython "python3 is required" \
  "$HOOK" "$SUBJECT_SKILL_DIR/SKILL.md"
probe_preflight "skill-audit/scripts/validate.sh reports missing python3" \
  nopython "python3 is required" \
  "$SKILL_VALIDATE" "$SUBJECT_SKILL_DIR"
probe_preflight "agent-audit/scripts/validate.sh reports missing python3" \
  nopython "python3 is required" \
  "$AGENT_VALIDATE" "$SUBJECT_AGENT_ROOT/.apm/agents/my-agent.agent.md"

echo ""
echo "--- a python3 that cannot import yaml is a hard failure in all three scripts, naming PyYAML ---"
probe_preflight "scripts/skill-size-check.sh reports missing PyYAML" \
  noyaml "PyYAML is required" \
  "$HOOK" "$SUBJECT_SKILL_DIR/SKILL.md"
probe_preflight "skill-audit/scripts/validate.sh reports missing PyYAML" \
  noyaml "PyYAML is required" \
  "$SKILL_VALIDATE" "$SUBJECT_SKILL_DIR"
probe_preflight "agent-audit/scripts/validate.sh reports missing PyYAML" \
  noyaml "PyYAML is required" \
  "$AGENT_VALIDATE" "$SUBJECT_AGENT_ROOT/.apm/agents/my-agent.agent.md"

# The control. Without it, "fails when the dependency is missing" is satisfied by
# a script that fails unconditionally, and the two cases above would be green on
# a gate that never runs at all.
echo ""
echo "--- control: with both dependencies present the same subjects pass ---"
for probe in "$HOOK:$SUBJECT_SKILL_DIR/SKILL.md" \
             "$SKILL_VALIDATE:$SUBJECT_SKILL_DIR" \
             "$AGENT_VALIDATE:$SUBJECT_AGENT_ROOT/.apm/agents/my-agent.agent.md"; do
  script="${probe%%:*}"
  arg="${probe#*:}"
  set +e
  ctl_out="$(bash "$script" "$arg" 2>&1)"
  ctl_rc=$?
  set -e
  if [[ $ctl_rc -eq 0 ]]; then
    pass "${script#"$REPO_ROOT/"} exits 0 on a clean subject with python3 and PyYAML available"
  else
    fail "${script#"$REPO_ROOT/"} failed a clean subject (exit $ctl_rc): $ctl_out"
  fi
done

# ---------------------------------------------------------------------------
# 3. verbose: true on the skill-size-check hook, in BOTH manifests
# ---------------------------------------------------------------------------
# .pre-commit-config.yaml governs this repo; .pre-commit-hooks.yaml is what a
# CONSUMER repo gets when it points at this one. Dropping the flag from either
# silences the SUGGESTION tier for that audience alone, which is the hardest
# version of the defect to notice.
echo ""
echo "--- the skill-size-check hook declares verbose: true in both manifests ---"
VERBOSE_REPORT="$(python3 - "$REPO_ROOT" <<'PY'
import os
import sys

import yaml

root = sys.argv[1]


def emit(status, msg):
    print("%s\t%s" % (status, msg))


# Repo config: nested repos[].hooks[].
path = os.path.join(root, '.pre-commit-config.yaml')
try:
    with open(path, encoding='utf-8') as fh:
        cfg = yaml.safe_load(fh) or {}
except Exception as exc:
    emit('FAIL', '.pre-commit-config.yaml did not parse: %s' % exc)
    cfg = {}
found = None
for repo in cfg.get('repos') or []:
    for hook in (repo.get('hooks') or []):
        if hook.get('id') == 'skill-size-check':
            found = hook
if found is None:
    emit('FAIL', '.pre-commit-config.yaml declares no hook with id skill-size-check')
elif found.get('verbose') is True:
    emit('PASS', '.pre-commit-config.yaml: skill-size-check is verbose: true')
else:
    emit('FAIL', '.pre-commit-config.yaml: skill-size-check has verbose=%r — '
                 'pre-commit prints nothing for a passing hook, so every '
                 'ADR-0020 SUGGESTION is swallowed' % (found.get('verbose'),))

# Consumer manifest: a flat list of hooks.
path = os.path.join(root, '.pre-commit-hooks.yaml')
try:
    with open(path, encoding='utf-8') as fh:
        hooks = yaml.safe_load(fh) or []
except Exception as exc:
    emit('FAIL', '.pre-commit-hooks.yaml did not parse: %s' % exc)
    hooks = []
found = None
for hook in hooks:
    if isinstance(hook, dict) and hook.get('id') == 'kyberforge-skill-size-check':
        found = hook
if found is None:
    emit('FAIL', '.pre-commit-hooks.yaml declares no hook with id kyberforge-skill-size-check')
elif found.get('verbose') is True:
    emit('PASS', '.pre-commit-hooks.yaml: kyberforge-skill-size-check is verbose: true')
else:
    emit('FAIL', '.pre-commit-hooks.yaml: kyberforge-skill-size-check has verbose=%r — '
                 'a consumer repo would never see the SUGGESTION tier'
                 % (found.get('verbose'),))
PY
)"
while IFS=$'\t' read -r status msg; do
  [[ -n "$status" ]] || continue
  if [[ "$status" == PASS ]]; then
    pass "$msg"
  else
    fail "$msg"
  fi
done <<< "$VERBOSE_REPORT"

echo ""
echo "Results: $PASS passed, $FAIL failed"
[[ $FAIL -eq 0 ]]