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

# Reproduction script for prettier editorconfig + git worktree bug.
#
# In a git worktree, .git is a file (not a directory). Prettier uses .git
# as the project root boundary when resolving .editorconfig files. Because
# it only looks for .git as a directory, it misses the worktree's .git file
# and walks up to parent directories — potentially picking up unrelated
# .editorconfig files (e.g. ~/.editorconfig).

REPRO_DIR=$(mktemp -d "$HOME/prettier-repro-XXXXXX")
EDITORCONFIG_BAK=""

echo "=== Setup ==="
echo "Repro dir: $REPRO_DIR"

# Back up existing ~/.editorconfig if present
if [ -f "$HOME/.editorconfig" ]; then
  EDITORCONFIG_BAK="$HOME/.editorconfig.bak.$$"
  cp "$HOME/.editorconfig" "$EDITORCONFIG_BAK"
  echo "Backed up existing ~/.editorconfig to $EDITORCONFIG_BAK"
fi

cleanup() {
  # Restore original ~/.editorconfig
  if [ -n "$EDITORCONFIG_BAK" ] && [ -f "$EDITORCONFIG_BAK" ]; then
    mv "$EDITORCONFIG_BAK" "$HOME/.editorconfig"
    echo "Restored ~/.editorconfig"
  else
    rm -f "$HOME/.editorconfig"
  fi
  rm -rf "$REPRO_DIR"
  echo "Cleaned up $REPRO_DIR"
}
trap cleanup EXIT

# Create a ~/.editorconfig that uses tabs
cat > "$HOME/.editorconfig" << 'EOF'
root = true

[*]
indent_style = tab
EOF
echo "Created ~/.editorconfig with indent_style = tab"

# --- Step 1: Create a git repo with a space-indented file ---
cd "$REPRO_DIR"
git init main-repo --quiet
cd main-repo

cat > test.js << 'EOF'
function hello() {
  console.log("hello");
  if (true) {
    console.log("world");
  }
}
EOF

npm init -y > /dev/null 2>&1
npm install [email protected] --save-dev > /dev/null 2>&1

git add -A
git commit -m "initial" --quiet

# --- Step 2: Verify formatting passes in the main repo ---
echo ""
echo "=== Main repo (.git is a directory) ==="
file .git
echo "Resolved editorconfig options:"
node -e "
const prettier = require('prettier');
prettier.resolveConfig('./test.js', { editorconfig: true })
  .then(c => console.log(JSON.stringify(c)));
"
echo -n "prettier --check: "
npx prettier --check test.js 2>&1 | tail -1

# --- Step 3: Create a worktree ---
git worktree add ../worktree-repo -b worktree-branch --quiet 2>&1

# --- Step 4: Verify formatting FAILS in the worktree ---
cd ../worktree-repo
echo ""
echo "=== Worktree (.git is a file) ==="
file .git
echo ".git contents: $(cat .git)"
echo "Resolved editorconfig options:"
node -e "
const prettier = require('prettier');
prettier.resolveConfig('./test.js', { editorconfig: true })
  .then(c => console.log(JSON.stringify(c)));
"
echo -n "prettier --check: "
npx prettier --check test.js 2>&1 | tail -1 || true

echo ""
echo "=== Result ==="
echo "In the main repo, .git is a directory and prettier correctly"
echo "uses it as the project root boundary for editorconfig resolution."
echo ""
echo "In the worktree, .git is a file and prettier does not recognize"
echo "it as a project root boundary. It walks up the filesystem and"
echo "picks up ~/.editorconfig (indent_style = tab), causing formatting"
echo "to differ between the main repo and the worktree."