#!/bin/bash
set -e

# Generic script to update all git submodules to their latest default branch (main/master)

echo "Starting submodule update..."

# Use git submodule foreach to iterate through all submodules
git submodule foreach --recursive '
    # Fetch latest references from origin
    git fetch origin -q
    
    # Detect the default branch (HEAD) from the remote
    # This handles repositories using "main", "master", or other default branch names
    TARGET_BRANCH=$(git remote show origin | grep "HEAD branch" | sed "s/.*: //")
    
    # Fallback if detection fails (unlikely on standard git servers)
    if [ -z "$TARGET_BRANCH" ]; then
        echo "  Warning: Could not detect HEAD branch for $name. Trying main..."
        if git show-ref --verify --quiet refs/remotes/origin/main; then
            TARGET_BRANCH="main"
        else
            TARGET_BRANCH="master"
        fi
    fi
    
    echo "  Processing $name: Checking out and pulling $TARGET_BRANCH"
    
    # Checkout the target branch
    git checkout "$TARGET_BRANCH" -q
    
    # Pull the latest changes
    git pull origin "$TARGET_BRANCH" -q
'

echo "All submodules updated successfully."