#!/bin/bash

# TimeSafari Generated Assets Purge Script
# Removes generated Android assets and resources from git history
# Author: Matthew Raymer

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"

echo "=== TimeSafari Generated Assets Purge ==="
echo "[$(date '+%Y-%m-%d %H:%M:%S')] [INFO] Starting git history cleanup"

# Check if we're in a git repository
if [ ! -d ".git" ]; then
    echo "[ERROR] Not in a git repository. Please run this script from the project root."
    exit 1
fi

# Check if we have uncommitted changes
if [ -n "$(git status --porcelain)" ]; then
    echo "[ERROR] You have uncommitted changes. Please commit or stash them first."
    echo "Current status:"
    git status --short
    exit 1
fi

# Create backup branch
BACKUP_BRANCH="backup-before-asset-purge-$(date +%Y%m%d-%H%M%S)"
echo "[INFO] Creating backup branch: $BACKUP_BRANCH"
git branch "$BACKUP_BRANCH"

echo "[INFO] Starting git filter-branch to remove generated assets..."

# Use git filter-branch to remove the directories from history
git filter-branch --force --index-filter '
    # Remove generated Android assets directory
    git rm -rf --cached --ignore-unmatch android/app/src/main/assets/public/ 2>/dev/null || true
    
    # Remove generated Android resources (but keep config files)
    git rm -rf --cached --ignore-unmatch android/app/src/main/res/drawable*/ 2>/dev/null || true
    git rm -rf --cached --ignore-unmatch android/app/src/main/res/mipmap*/ 2>/dev/null || true
    git rm -rf --cached --ignore-unmatch android/app/src/main/res/values/ic_launcher_background.xml 2>/dev/null || true
    
    # Keep configuration files
    git add android/app/src/main/res/values/strings.xml 2>/dev/null || true
    git add android/app/src/main/res/values/styles.xml 2>/dev/null || true
    git add android/app/src/main/res/layout/activity_main.xml 2>/dev/null || true
    git add android/app/src/main/res/xml/config.xml 2>/dev/null || true
    git add android/app/src/main/res/xml/file_paths.xml 2>/dev/null || true
' --prune-empty --tag-name-filter cat -- --all

echo "[INFO] Cleaning up git filter-branch temporary files..."
rm -rf .git/refs/original/
git reflog expire --expire=now --all
git gc --prune=now --aggressive

echo "[SUCCESS] Generated assets purged from git history!"
echo "[INFO] Backup branch created: $BACKUP_BRANCH"
echo "[INFO] Repository size should be significantly reduced"
echo ""
echo "Next steps:"
echo "1. Test that the repository works correctly"
echo "2. Force push to remote: git push --force-with-lease origin <branch>"
echo "3. Inform team members to re-clone or reset their local repositories"
echo "4. Delete backup branch when confident: git branch -D $BACKUP_BRANCH"