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

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
cd "$REPO_ROOT"

current_branch="$(git symbolic-ref -q --short HEAD || true)"
if [ -z "$current_branch" ]; then
    echo "✗ pre-push rebase: detached HEAD detected."
    echo "  Checkout a branch before pushing."
    exit 1
fi

if ! git rev-parse --verify --quiet HEAD >/dev/null; then
    echo "✗ pre-push rebase: current branch has no commits yet."
    exit 1
fi

if [ -n "$(git status --porcelain)" ]; then
    echo "✗ pre-push rebase: working tree is not clean."
    echo "  Commit or stash changes before pushing."
    exit 1
fi

if [ -d .git/rebase-merge ] || [ -d .git/rebase-apply ]; then
    echo "✗ pre-push rebase: a rebase is already in progress."
    exit 1
fi

echo "Fetching origin/git-main..."
git fetch origin git-main

if ! git rev-parse --verify --quiet origin/git-main >/dev/null; then
    echo "✗ pre-push rebase: origin/git-main is not available locally."
    echo "  Fetch origin first, then push again."
    exit 1
fi

echo "Rebasing '$current_branch' onto origin/git-main before push..."
git rebase origin/git-main

echo "✓ Rebase completed for '$current_branch'"