#!/usr/bin/env bash
# Tier 2 gate: types, build, content contracts, dependency audit, tokens.
# Invoked by .husky/pre-push, and safe to run by hand at any time.
#
# Parallel-safe: takes a lock in the SHARED git dir, so ten agents pushing from
# ten worktrees queue instead of running ten concurrent Astro builds and
# thrashing the machine. Waiters block; they do not fail.
set -euo pipefail

root=$(git rev-parse --show-toplevel)
cd "$root"

# --git-common-dir resolves to the ONE shared .git across all worktrees, which
# is exactly the scope we want the lock to cover.
common=$(git rev-parse --git-common-dir)
lock="$common/af-gate.lock"

exec 9>"$lock"
if ! flock -n 9; then
  echo "gate: another worktree is running the gate — waiting for it…"
  flock 9
fi

started=$(date +%s)
step() { printf '\n\033[1m▸ %s\033[0m\n' "$1"; }

# Fail loudly rather than passing vacuously when the toolchain is not installed.
if [ ! -d node_modules ]; then
  echo "gate: node_modules missing — run 'pnpm install --frozen-lockfile' first" >&2
  exit 1
fi

# This project is pnpm-only. An agent that runs `npm install` out of habit gets
# a second, divergent dependency tree and a lockfile nobody reads — the same
# class of failure that cost two sessions during phase 0. Catch it here.
if [ -f package-lock.json ] || [ -f yarn.lock ] || [ -f bun.lock ] || [ -f bun.lockb ]; then
  echo "gate: a non-pnpm lockfile is present. This project uses pnpm only." >&2
  echo "      Delete it, then run 'pnpm install --frozen-lockfile'." >&2
  exit 1
fi

step "types"
pnpm exec astro check

step "build"
pnpm run build

step "content contracts"
pnpm run verify

# The assertion count is the thing agents are most tempted to "fix" downward.
# Compare against origin/main and refuse a silent reduction.
step "assertion coverage"
current=$(grep -c 'throw new Error' scripts/verify.mjs)
baseline=$(git show origin/main:scripts/verify.mjs 2>/dev/null | grep -c 'throw new Error' || echo "$current")
if [ "$current" -lt "$baseline" ]; then
  echo "gate: verify.mjs coverage fell from $baseline to $current assertions." >&2
  echo "      Only verification-engineer may reduce it, with a reason per removal." >&2
  echo "      See .agents/context/verification.md" >&2
  exit 1
fi
echo "  $current assertions (baseline $baseline)"

step "runtime dependency audit"
node scripts/audit-ui.mjs

step "design tokens"
node .agents/scripts/check-tokens.mjs

printf '\n\033[32mgate passed\033[0m in %ss\n' "$(( $(date +%s) - started ))"