#!/bin/bash
# Mastodon Backup Script
# Creates a complete backup for migration to another server
# Run as root

set -e

BACKUP_DIR="${BACKUP_DIR:-/home/mastodon/backups}"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_NAME="mastodon_backup_${TIMESTAMP}"
BACKUP_PATH="${BACKUP_DIR}/${BACKUP_NAME}"

echo "=========================================="
echo "Mastodon Backup Script"
echo "Backup location: ${BACKUP_PATH}"
echo "=========================================="

# Create backup directory
mkdir -p "${BACKUP_PATH}"

# 1. Backup PostgreSQL database
echo "[1/5] Backing up PostgreSQL database..."
sudo -u postgres pg_dump -Fc mastodon_production > "${BACKUP_PATH}/database.dump"
echo "  Database backup: $(du -h ${BACKUP_PATH}/database.dump | cut -f1)"

# 2. Backup .env.production (contains secrets)
echo "[2/5] Backing up configuration..."
cp /home/mastodon/live/.env.production "${BACKUP_PATH}/.env.production"

# 3. Backup user uploads (avatars, headers, media)
echo "[3/5] Backing up user uploads (this may take a while)..."
if [ -d /home/mastodon/live/public/system ]; then
    tar -czf "${BACKUP_PATH}/system.tar.gz" -C /home/mastodon/live/public system
    echo "  System files: $(du -h ${BACKUP_PATH}/system.tar.gz | cut -f1)"
else
    echo "  No system directory found (fresh install)"
fi

# 4. Backup custom files (if any)
echo "[4/5] Backing up custom files..."
mkdir -p "${BACKUP_PATH}/custom"

# Custom CSS/branding
if [ -f /home/mastodon/live/app/javascript/styles/custom.scss ]; then
    cp /home/mastodon/live/app/javascript/styles/custom.scss "${BACKUP_PATH}/custom/"
fi

# Site uploads (favicon, thumbnail, etc)
if [ -d /home/mastodon/live/public/site_uploads ]; then
    cp -r /home/mastodon/live/public/site_uploads "${BACKUP_PATH}/custom/"
fi

# 5. Export user data
echo "[5/5] Exporting instance data..."
sudo -u mastodon bash -c "cd ~/live && export PATH=\"\$HOME/.rbenv/bin:\$PATH\" && eval \"\$(rbenv init -)\" && RAILS_ENV=production bin/tootctl accounts export > /dev/null 2>&1" || true

# Create restore instructions
cat > "${BACKUP_PATH}/RESTORE.md" << 'RESTORE'
# Mastodon Restore Instructions

## On the new server:

1. Run the install script first (without creating admin user)
2. Stop all Mastodon services:
   ```
   systemctl stop mastodon-web mastodon-sidekiq mastodon-streaming
   ```

3. Restore the database:
   ```
   sudo -u postgres dropdb mastodon_production
   sudo -u postgres createdb -O mastodon mastodon_production
   sudo -u postgres pg_restore -d mastodon_production database.dump
   ```

4. Restore .env.production:
   ```
   cp .env.production /home/mastodon/live/.env.production
   chown mastodon:mastodon /home/mastodon/live/.env.production
   chmod 600 /home/mastodon/live/.env.production
   ```

5. Restore user uploads:
   ```
   cd /home/mastodon/live/public
   tar -xzf /path/to/backup/system.tar.gz
   chown -R mastodon:mastodon system
   ```

6. Update LOCAL_DOMAIN in .env.production if domain changed

7. Run migrations (in case of version upgrade):
   ```
   sudo -u mastodon bash -lc 'cd ~/live && RAILS_ENV=production bundle exec rails db:migrate'
   ```

8. Recompile assets:
   ```
   sudo -u mastodon bash -lc 'cd ~/live && RAILS_ENV=production bundle exec rails assets:precompile'
   ```

9. Fix SELinux contexts:
   ```
   chcon -R -t httpd_sys_content_t /home/mastodon/live/public
   ```

10. Start services:
    ```
    systemctl start mastodon-web mastodon-sidekiq mastodon-streaming
    ```
RESTORE

# Create final archive
echo ""
echo "Creating final archive..."
cd "${BACKUP_DIR}"
tar -czf "${BACKUP_NAME}.tar.gz" "${BACKUP_NAME}"
rm -rf "${BACKUP_NAME}"

FINAL_SIZE=$(du -h "${BACKUP_DIR}/${BACKUP_NAME}.tar.gz" | cut -f1)

echo ""
echo "=========================================="
echo "✅ Backup Complete!"
echo "=========================================="
echo ""
echo "Backup file: ${BACKUP_DIR}/${BACKUP_NAME}.tar.gz"
echo "Size: ${FINAL_SIZE}"
echo ""
echo "To download: scp root@server:${BACKUP_DIR}/${BACKUP_NAME}.tar.gz ."
echo ""