#!/usr/bin/env bash
# Structural gates that need no compiler, so they run first and finish instantly.
#
# Both of these exist because the repository has already been wrong in exactly
# these two ways, and in both cases the mistake was invisible: the build stayed
# green while the code was not being built.
#
#   scripts/workspace-guard.sh
set -euo pipefail

root="$(cd "$(dirname "$0")/.." && pwd)"
cd "$root"
status=0

# ---------------------------------------------------------------------------
# 1. Every crate is a member or is explicitly excluded.
#
# A crate directory named in neither list is not a build error. Cargo simply
# never looks at it: no lints, no tests, no compilation. lumbridge-devices sat
# that way with 1,127 lines, 19 tests that had never run, and a `mod` statement
# pointing at a file that did not exist. Decision 0017 records the same failure
# a month earlier with the GPUI shell in `spikes/`. Neither was caught by a
# human reading a diff, so it is caught here instead.
members="$(sed -n '/^members = \[/,/^]/p' Cargo.toml)"
excludes="$(sed -n '/^exclude = \[/,/^]/p' Cargo.toml)"
# A single-line `exclude = [...]` does not match the range above; catch it too.
excludes="$excludes$(grep -E '^exclude = \[.*\]' Cargo.toml || true)"

while IFS= read -r manifest; do
  dir="$(dirname "$manifest")"
  dir="${dir#./}"
  # A crate carrying its own [workspace] table is deliberately independent.
  if grep -qE '^\[workspace\]' "$manifest"; then
    continue
  fi
  if printf '%s' "$members" | grep -qF "\"$dir\""; then
    continue
  fi
  if printf '%s' "$excludes" | grep -qF "\"$dir\""; then
    continue
  fi
  echo "workspace-guard: $dir/Cargo.toml is in neither workspace.members nor workspace.exclude." >&2
  echo "                 Cargo will never build it, lint it, or run its tests. See AGENTS.md." >&2
  status=1
done < <(find apps crates tools -mindepth 2 -maxdepth 2 -name Cargo.toml 2>/dev/null | sort)

# ---------------------------------------------------------------------------
# 2. The GPUI dependency is the one the decision record chose.
#
# Checked against Cargo.lock rather than the manifest, because the manifest
# states an intent and the lockfile states what would actually be compiled --
# and a caret requirement in the manifest silently accepts a version nobody
# decided on. Asserted in the fast headless job so it gates every push, and not
# in the UI job, which is `continue-on-error` and therefore cannot fail one.
#
# Changing this line means writing a decision record. See AGENTS.md,
# "Dependencies that are not an agent's decision".
expected_gpui_source='registry+https://github.com/rust-lang/crates.io-index'
expected_gpui_version='0.2.2'

gpui_block="$(awk '/^name = "gpui"$/{found=1} found{print} found&&/^$/{exit}' Cargo.lock)"
if [ -z "$gpui_block" ]; then
  echo "workspace-guard: no gpui package in Cargo.lock; the shell cannot build." >&2
  status=1
else
  actual_version="$(printf '%s' "$gpui_block" | sed -n 's/^version = "\(.*\)"$/\1/p')"
  actual_source="$(printf '%s' "$gpui_block" | sed -n 's/^source = "\(.*\)"$/\1/p')"
  if [ "$actual_version" != "$expected_gpui_version" ] || [ "$actual_source" != "$expected_gpui_source" ]; then
    echo "workspace-guard: the gpui dependency is not the one the decision record chose." >&2
    echo "                 expected $expected_gpui_version from $expected_gpui_source" >&2
    echo "                 found    $actual_version from $actual_source" >&2
    echo "                 A bump is a decision record, not a commit. See AGENTS.md." >&2
    status=1
  fi
fi

if [ "$status" = 0 ]; then
  echo "workspace-guard: crate membership and the pinned UI dependency are as recorded."
fi
exit "$status"