#!/usr/bin/env bash
# Read-only local environment and repository diagnosis.
set -u

root=$(cd "$(dirname "$0")/.." && pwd)
offline=0
case "${1:-}" in
  --offline) offline=1 ;;
  "") ;;
  -h|--help) echo "usage: tools/doctor.sh [--offline]"; exit 0 ;;
  *) echo "unknown option: $1" >&2; exit 2 ;;
esac

fail=0
warn=0
ok() { printf 'OK: %s\n' "$1"; }
bad() { printf 'FAIL: %s\n' "$1"; fail=1; }
warning() { printf 'WARN: %s\n' "$1"; warn=$((warn + 1)); }

for command in git python3 cargo rustc bash; do
  if command -v "$command" >/dev/null 2>&1; then
    ok "$command ($(command -v "$command"))"
  else
    bad "required command missing: $command"
  fi
done

if [ "$fail" -eq 0 ]; then
  (cd "$root" && cargo metadata --no-deps --format-version 1 >/dev/null 2>&1) \
    && ok "Cargo workspace metadata" || bad "Cargo workspace metadata"
  (cd "$root" && python3 tools/work_orders.py validate >/dev/null 2>&1) \
    && ok "work-order metadata" || bad "work-order metadata (run tools/work_orders.py validate)"
  git -C "$root" rev-parse --verify origin/main >/dev/null 2>&1 \
    && ok "origin/main available" || bad "origin/main unavailable"
fi

if [ -L "$root/target" ]; then
  target=$(readlink "$root/target")
  case "$target" in "$root"/*) ok "target symlink stays inside worktree" ;; *) bad "target points outside worktree: $target" ;; esac
else
  ok "target is private or absent"
fi

if command -v sccache >/dev/null 2>&1; then ok "sccache available"; else warning "sccache unavailable (optional)"; fi
if command -v pnpm >/dev/null 2>&1; then ok "pnpm available"; else warning "pnpm unavailable (needed only for site work)"; fi

if [ "$(uname -s)" = Linux ] && [ -z "${DISPLAY:-}${WAYLAND_DISPLAY:-}" ]; then
  command -v xvfb-run >/dev/null 2>&1 \
    && ok "xvfb-run available for Bevy evidence" \
    || warning "no display or xvfb-run; headless Bevy evidence cannot run"
else
  ok "display path available for hidden Bevy evidence"
fi

if [ "$offline" -eq 1 ]; then
  warning "Tangled context/auth skipped (--offline)"
elif command -v tang >/dev/null 2>&1; then
  (cd "$root" && tang context >/dev/null 2>&1) \
    && ok "Tangled repository context/auth" \
    || warning "Tangled context/auth unavailable"
else
  warning "tang unavailable (decision issues omitted)"
fi

printf 'doctor: %s required failure(s), %s warning(s)\n' "$fail" "$warn"
[ "$fail" -eq 0 ]