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

# Run agent-audit's validate.sh over every REAL plugin-scope agent file in this
# repo (plugins/*/.apm/agents/*.agent.md).
#
# Why this exists: validate.sh was previously exercised only by
# scripts/check-scope-walkup-sync.sh, and only against synthetic fixtures built
# in mktemp trees. It had never once run against the four agent files it
# actually governs. That is how ADR-0016 could be amended to bless a
# `disallowedTools` frontmatter field while validate.sh's allowlist still
# rejected it -- the spec and its enforcer disagreed, every gate stayed green,
# and the contradiction only surfaced when someone ran the validator by hand.
#
# A validator that checks fixtures but never artifacts is the same
# green-because-nothing-was-checked shape as a suite that runs on an empty file
# set. This closes it: the artifacts are the input.
#
# Run from repo root, or pass REPO_ROOT as the first argument (tests do).
# Needs no network.

REPO_ROOT="${1:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"

# A nonexistent REPO_ROOT must fail loudly rather than fall through to the
# zero-files floor below with a confusing message -- a typo'd or stale path is a
# different problem from a repo that genuinely has no agents, and the fix
# differs too.
if [[ ! -d "$REPO_ROOT" ]]; then
  echo "APM agent validation failed: REPO_ROOT '$REPO_ROOT' is not a directory." >&2
  exit 1
fi
REPO_ROOT="$(cd "$REPO_ROOT" && pwd)"

VALIDATE="$REPO_ROOT/plugins/kyberforge/.apm/skills/agent-audit/scripts/validate.sh"

# The validator's own absence is a hard failure, never a skip. If validate.sh
# moves or is deleted, every assertion below evaporates and the hook would
# otherwise exit 0 having validated nothing -- indistinguishable, from
# pre-commit's silent-on-pass output, from a run where all four agents passed.
if [[ ! -f "$VALIDATE" ]]; then
  echo "APM agent validation failed: validator not found at $VALIDATE — this script's path has gone stale, so no agent file was checked. Update it to wherever agent-audit's validate.sh now lives." >&2
  exit 1
fi

# validate.sh is a bash wrapper around a heredoc'd python3 program. Without
# python3 it dies with a bare "command not found" per file and no pointer, which
# reads like a validation failure rather than a missing dependency. Fail closed,
# but say which it is.
if ! command -v python3 >/dev/null 2>&1; then
  echo "APM agent validation failed: python3 not found on PATH — agent-audit's validate.sh is a python3 program and cannot run. Install python3; this gate does not degrade to a pass." >&2
  exit 1
fi

# --- Discover the agent files ---
# `-not -path` mirrors tests/run-bats.sh: worktrees under .claude/ are other
# checkouts of this same repo, not additional content.
AGENT_FILES=()
while IFS= read -r f; do
  [[ -n "$f" ]] && AGENT_FILES+=("$f")
done < <(
  find "$REPO_ROOT/plugins" -type f -name '*.agent.md' \
    -path '*/.apm/agents/*' \
    -not -path '*/.claude/worktrees/*' \
    2>/dev/null | sort
)

# --- Derive the EXPECTED set from the index, not from a hardcoded count ---
# Same reasoning as tests/run-bats.sh: a magic number goes stale the moment a
# plugin gains or loses an agent, and slack in a floor is exactly where a
# silently-deleted file hides. `git ls-files` needs no maintenance -- a newly
# `git add`ed agent file joins the expectation immediately.
#
# Direction matters, and it is the same direction run-bats.sh uses: every
# TRACKED file must have been discovered, but a discovered file need not be
# tracked. An untracked new agent file is ordinary work in progress (and is
# still validated below), while a file that vanished from the worktree without
# leaving the index is an accident and fails here. A deliberate `git rm` leaves
# the index, so intentional removal passes.
#
# The exact-equality check on --show-toplevel keeps this off the mktemp fixture
# trees in tests/test-check-apm-agents-valid.sh, which resolve no worktree. That
# degradation is announced rather than silent, and the zero-file floor below is
# unconditional regardless.
EXPECTED_FILES=()
DERIVED=false
GIT_TOPLEVEL="$(git -C "$REPO_ROOT" rev-parse --show-toplevel 2>/dev/null || true)"
if [[ -n "$GIT_TOPLEVEL" && "$GIT_TOPLEVEL" == "$REPO_ROOT" ]]; then
  DERIVED=true
  while IFS= read -r f; do
    [[ -n "$f" ]] && EXPECTED_FILES+=("$REPO_ROOT/$f")
  done < <(
    git -C "$REPO_ROOT" ls-files -- 'plugins/*/.apm/agents/*.agent.md' \
      | grep -Ev '(^|/)\.claude/worktrees/' \
      | sort || true
  )
else
  echo "Note: $REPO_ROOT is not a git worktree root, so the expected agent file set could not be derived from the index — only the zero-file floor below applies" >&2
fi

if [[ "$DERIVED" == true && ${#EXPECTED_FILES[@]} -gt 0 ]]; then
  MISSING=()
  for expected in ${EXPECTED_FILES[@]+"${EXPECTED_FILES[@]}"}; do
    found=false
    for actual in ${AGENT_FILES[@]+"${AGENT_FILES[@]}"}; do
      if [[ "$actual" == "$expected" ]]; then
        found=true
        break
      fi
    done
    [[ "$found" == true ]] || MISSING+=("${expected#"$REPO_ROOT"/}")
  done
  if [[ ${#MISSING[@]} -gt 0 ]]; then
    echo "APM agent validation failed: ${#MISSING[@]} of ${#EXPECTED_FILES[@]} tracked agent file(s) were not discovered under $REPO_ROOT — they were deleted without being removed from the index, or this script's search path no longer reaches them:" >&2
    for m in ${MISSING[@]+"${MISSING[@]}"}; do
      echo "  $m" >&2
    done
    exit 1
  fi
fi

# Unconditional floor, separate from the derived check above: a tree with
# nothing tracked (a tarball export, a fresh scaffold, a moved plugins/ root)
# still must not validate an empty set and call it green. Zero files is an
# error, not a pass -- that is the entire defect this script was written to
# close, one level up.
if [[ ${#AGENT_FILES[@]} -eq 0 ]]; then
  echo "APM agent validation failed: found 0 plugin-scope agent file(s) under $REPO_ROOT/plugins — the search path is wrong or every .apm/agents/ directory has been emptied. Zero files is never a pass." >&2
  exit 1
fi

# --- Validate ---
FAIL=0
FAILED_FILES=()
for f in ${AGENT_FILES[@]+"${AGENT_FILES[@]}"}; do
  rel="${f#"$REPO_ROOT"/}"
  # validate.sh prints its FAIL lines on stdout and its own errors on stderr;
  # both are captured and replayed under the filename so the reason travels with
  # the file that caused it. pre-commit shows a failing hook's output verbatim,
  # so this is what a developer reads.
  out=""
  rc=0
  out="$(bash "$VALIDATE" "$f" 2>&1)" || rc=$?
  if [[ "$rc" -ne 0 ]]; then
    FAIL=1
    FAILED_FILES+=("$rel")
    echo "FAIL: $rel (validate.sh exit $rc)" >&2
    if [[ -n "$out" ]]; then
      printf '%s\n' "$out" | sed 's/^/    /' >&2
    else
      echo "    (validate.sh produced no output — see its exit code above; 2 means script error, e.g. a missing references/field-inventory.md)" >&2
    fi
  fi
done

if [[ "$FAIL" -ne 0 ]]; then
  echo "" >&2
  echo "APM agent validation failed: ${#FAILED_FILES[@]} of ${#AGENT_FILES[@]} agent file(s) did not pass agent-audit's validate.sh." >&2
  exit 1
fi

echo "APM agent validation passed: ${#AGENT_FILES[@]} plugin-scope agent file(s) validated against agent-audit's validate.sh."