#!/usr/bin/env bash
# Regression harness for #856: worker git-worktrees under a fresh `git worktree
# add` have no node_modules until `pnpm install` runs (pnpm workspaces do NOT
# share node_modules across worktrees). Before the fix, the gate-entry seam
# (qa-hook-stdin.sh, registered as the PostToolUse hook for every Edit/Write/
# MultiEdit in runtime/claude/settings.json) silently let a raw
# `sh: 1: <tool>: not found` surface from any downstream gate invocation —
# indistinguishable from a real test/lint failure (false-red).
#
# Asserts:
#   1. RED (documented): a completely fresh worktree with no node_modules/.bin
#      at all produces the raw "not found" for a gate binary — this is the
#      defect the fix prevents from reaching the operator un-annotated.
#   2. With node_modules/.bin missing entirely, the seam exits nonzero with
#      the legible sentinel "deps not installed — run pnpm install" instead
#      of silently proceeding (exit 0) into a would-be raw not-found.
#   3. With node_modules/.bin present but empty, same legible-sentinel
#      behavior (covers `git worktree add` immediately followed by an
#      as-yet-incomplete/interrupted install).
#   4. Once node_modules/.bin is populated (post `pnpm install`), the seam
#      proceeds normally (exit 0) — the preflight does not false-positive.
#   5. Non-JS/TS files are unaffected (existing skip behavior preserved).

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
HOOK="$SCRIPT_DIR/qa-hook-stdin.sh"

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

fail=0

fail_msg() {
    echo "FAIL: $*" >&2
    fail=1
}

run_hook() {
    local file_path="$1"
    printf '{"tool_name":"Edit","tool_input":{"file_path":"%s"}}' "$file_path" | "$HOOK"
}

make_fixture_repo() {
    local dir="$1"
    mkdir -p "$dir"
    git -C "$dir" init -q .
    git -C "$dir" -c user.email=fixture@test -c user.name=fixture commit -q --allow-empty -m init
}

# --- Scenario 1: RED — document the pre-fix raw not-found a gate hits when
#     node_modules/.bin is entirely absent (this is what the preflight now
#     intercepts before any gate command runs).
RED_DIR="$TMP_DIR/red-fixture"
make_fixture_repo "$RED_DIR"
RED_OUTPUT=$(PATH="/usr/bin:/bin" sh -c 'tsc --noEmit' 2>&1) && RED_STATUS=0 || RED_STATUS=$?
case "$RED_OUTPUT" in
    *"not found"*) ;;
    *) fail_msg "expected the raw un-preflighted invocation to demonstrate 'not found'; got: $RED_OUTPUT" ;;
esac
[[ "$RED_STATUS" -ne 0 ]] || fail_msg "expected raw invocation without deps installed to fail"

# --- Scenario 2: node_modules/.bin missing entirely -> legible sentinel, nonzero.
MISSING_DIR="$TMP_DIR/missing-bin"
make_fixture_repo "$MISSING_DIR"
echo "console.log(1)" > "$MISSING_DIR/x.ts"
OUTPUT=$(cd "$MISSING_DIR" && run_hook "$MISSING_DIR/x.ts" 2>&1) && STATUS=0 || STATUS=$?
[[ "$STATUS" -ne 0 ]] || fail_msg "missing node_modules/.bin: expected nonzero exit, got 0"
case "$OUTPUT" in
    *"deps not installed"*"pnpm install"*) ;;
    *) fail_msg "missing node_modules/.bin: expected legible sentinel, got: $OUTPUT" ;;
esac

# --- Scenario 3: node_modules/.bin present but empty -> legible sentinel, nonzero.
EMPTY_DIR="$TMP_DIR/empty-bin"
make_fixture_repo "$EMPTY_DIR"
mkdir -p "$EMPTY_DIR/node_modules/.bin"
echo "console.log(1)" > "$EMPTY_DIR/x.ts"
OUTPUT=$(cd "$EMPTY_DIR" && run_hook "$EMPTY_DIR/x.ts" 2>&1) && STATUS=0 || STATUS=$?
[[ "$STATUS" -ne 0 ]] || fail_msg "empty node_modules/.bin: expected nonzero exit, got 0"
case "$OUTPUT" in
    *"deps not installed"*"pnpm install"*) ;;
    *) fail_msg "empty node_modules/.bin: expected legible sentinel, got: $OUTPUT" ;;
esac

# --- Scenario 4: node_modules/.bin populated (post `pnpm install`) -> proceeds normally.
OK_DIR="$TMP_DIR/installed-bin"
make_fixture_repo "$OK_DIR"
mkdir -p "$OK_DIR/node_modules/.bin"
printf '#!/bin/sh\necho ok\n' > "$OK_DIR/node_modules/.bin/tsc"
chmod +x "$OK_DIR/node_modules/.bin/tsc"
echo "console.log(1)" > "$OK_DIR/x.ts"
OUTPUT=$(cd "$OK_DIR" && run_hook "$OK_DIR/x.ts" 2>&1) && STATUS=0 || STATUS=$?
[[ "$STATUS" -eq 0 ]] || fail_msg "populated node_modules/.bin: expected exit 0, got $STATUS ($OUTPUT)"
case "$OUTPUT" in
    *"deps not installed"*) fail_msg "populated node_modules/.bin: unexpected sentinel fired: $OUTPUT" ;;
    *) ;;
esac

# --- Scenario 5: non-JS/TS files are unaffected by the preflight (still
#     skipped before the deps check, regardless of node_modules state).
NONJS_DIR="$TMP_DIR/nonjs"
make_fixture_repo "$NONJS_DIR"
echo "# doc" > "$NONJS_DIR/README.md"
OUTPUT=$(cd "$NONJS_DIR" && run_hook "$NONJS_DIR/README.md" 2>&1) && STATUS=0 || STATUS=$?
[[ "$STATUS" -eq 0 ]] || fail_msg "non-JS/TS file: expected exit 0 (skip), got $STATUS ($OUTPUT)"
case "$OUTPUT" in
    *"deps not installed"*) fail_msg "non-JS/TS file: preflight incorrectly fired: $OUTPUT" ;;
    *) ;;
esac

if [[ "$fail" -eq 0 ]]; then
    echo "deps-preflight regression passed (5/5 scenarios)"
fi

exit "$fail"