#!/bin/bash
#
# ATCR UpCloud Initialization Script for Rocky Linux
#
# This script sets up ATCR on a fresh Rocky Linux instance.
# Paste this into UpCloud's "User data" field when creating a server.
#
# What it does:
#   - Updates system packages
#   - Creates 2GB swap file (for 1GB RAM instances)
#   - Installs Docker and Docker Compose
#   - Creates directory structure
#   - Clones ATCR repository
#   - Creates systemd service for auto-start
#   - Builds and starts containers
#
# Post-deployment:
#   1. Edit /opt/atcr/.env with your configuration
#   2. Run: systemctl restart atcr
#   3. Check logs: docker logs atcr-hold (for OAuth URL)
#   4. Complete hold registration via OAuth

set -euo pipefail

# Configuration
ATCR_DIR="/opt/atcr"
ATCR_REPO="https://tangled.org/@evan.jarrett.net/at-container-registry"  # UPDATE THIS
ATCR_BRANCH="main"

# Simple logging without colors (for cloud-init log compatibility)
log_info() {
    echo "[INFO] $1"
}

log_warn() {
    echo "[WARN] $1"
}

log_error() {
    echo "[ERROR] $1"
}

# Function to check if command exists
command_exists() {
    command -v "$1" >/dev/null 2>&1
}

log_info "Starting ATCR deployment on Rocky Linux..."

# Update system packages
log_info "Updating system packages..."
dnf update -y

# Install required packages
log_info "Installing prerequisites..."
dnf install -y \
    git \
    wget \
    curl \
    nano \
    vim

log_info "Required ports: HTTP (80), HTTPS (443), SSH (22)"

# Create swap file for instances with limited RAM
if [ ! -f /swapfile ]; then
    log_info "Creating 2GB swap file (allows builds on 1GB RAM instances)..."
    dd if=/dev/zero of=/swapfile bs=1M count=2048 status=progress
    chmod 600 /swapfile
    mkswap /swapfile
    swapon /swapfile

    # Make swap permanent
    echo '/swapfile none swap sw 0 0' >> /etc/fstab

    log_info "Swap file created and enabled"
    free -h
else
    log_info "Swap file already exists"
fi

# Install Docker
if ! command_exists docker; then
    log_info "Installing Docker..."

    # Add Docker repository
    dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

    # Install Docker
    dnf install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

    # Start and enable Docker
    systemctl enable --now docker

    log_info "Docker installed successfully"
else
    log_info "Docker already installed"
fi

# Verify Docker Compose
if ! docker compose version >/dev/null 2>&1; then
    log_error "Docker Compose plugin not found. Please install manually."
    exit 1
fi

log_info "Docker Compose version: $(docker compose version)"

# Create ATCR directory
log_info "Creating ATCR directory: $ATCR_DIR"
mkdir -p "$ATCR_DIR"
cd "$ATCR_DIR"

# Clone repository or create minimal structure
if [ -n "$ATCR_REPO" ] && [ "$ATCR_REPO" != "https://tangled.org/@evan.jarrett.net/at-container-registry" ]; then
    log_info "Cloning ATCR repository..."
    git clone -b "$ATCR_BRANCH" "$ATCR_REPO" .
else
    log_warn "ATCR_REPO not configured. You'll need to manually copy files to $ATCR_DIR"
    log_warn "Required files:"
    log_warn "  - deploy/docker-compose.prod.yml"
    log_warn "  - deploy/.env.prod.template"
    log_warn "  - Dockerfile.appview"
    log_warn "  - Dockerfile.hold"
fi

# Create .env file from template if it doesn't exist
if [ -f "deploy/.env.prod.template" ] && [ ! -f "$ATCR_DIR/.env" ]; then
    log_info "Creating .env file from template..."
    cp deploy/.env.prod.template "$ATCR_DIR/.env"
    log_warn "IMPORTANT: Edit $ATCR_DIR/.env with your configuration!"
fi

# Create systemd service
log_info "Creating systemd service..."
cat > /etc/systemd/system/atcr.service <<'EOF'
[Unit]
Description=ATCR Container Registry
Requires=docker.service
After=docker.service network-online.target
Wants=network-online.target

[Service]
Type=oneshot
RemainAfterExit=yes
WorkingDirectory=/opt/atcr
EnvironmentFile=/opt/atcr/.env

# Start containers
ExecStart=/usr/bin/docker compose -f /opt/atcr/deploy/docker-compose.prod.yml up -d

# Stop containers
ExecStop=/usr/bin/docker compose -f /opt/atcr/deploy/docker-compose.prod.yml down

# Restart containers
ExecReload=/usr/bin/docker compose -f /opt/atcr/deploy/docker-compose.prod.yml restart

# Always restart on failure
Restart=on-failure
RestartSec=10

[Install]
WantedBy=multi-user.target
EOF

# Reload systemd
log_info "Reloading systemd daemon..."
systemctl daemon-reload

# Enable service (but don't start yet - user needs to configure .env)
systemctl enable atcr.service

log_info "Systemd service created and enabled"

# Create helper scripts
log_info "Creating helper scripts..."

# Script to rebuild and restart
cat > "$ATCR_DIR/rebuild.sh" <<'EOF'
#!/bin/bash
set -e
cd /opt/atcr
docker compose -f deploy/docker-compose.prod.yml build
docker compose -f deploy/docker-compose.prod.yml up -d
docker compose -f deploy/docker-compose.prod.yml logs -f
EOF
chmod +x "$ATCR_DIR/rebuild.sh"

# Script to view logs
cat > "$ATCR_DIR/logs.sh" <<'EOF'
#!/bin/bash
cd /opt/atcr
docker compose -f deploy/docker-compose.prod.yml logs -f "$@"
EOF
chmod +x "$ATCR_DIR/logs.sh"

# Script to get hold OAuth URL
cat > "$ATCR_DIR/get-hold-oauth.sh" <<'EOF'
#!/bin/bash
echo "Checking atcr-hold logs for OAuth registration URL..."
docker logs atcr-hold 2>&1 | grep -i "oauth\|authorization\|visit\|http" | tail -20
EOF
chmod +x "$ATCR_DIR/get-hold-oauth.sh"

log_info "Helper scripts created in $ATCR_DIR"

# Print completion message
cat <<'EOF'

================================================================================
ATCR Installation Complete!
================================================================================

NEXT STEPS:

1. Configure environment variables:
   nano /opt/atcr/.env

   Required settings:
   - AWS_ACCESS_KEY_ID (UpCloud S3 credentials)
   - AWS_SECRET_ACCESS_KEY

   Pre-configured (verify these are correct):
   - APPVIEW_DOMAIN=atcr.io
   - HOLD_DOMAIN=hold01.atcr.io
   - HOLD_OWNER=did:plc:pddp4xt5lgnv2qsegbzzs4xg
   - S3_BUCKET=atcr
   - S3_ENDPOINT=https://blobs.atcr.io

2. Configure UpCloud Cloud Firewall (in control panel):
   Allow: TCP 22 (SSH)
   Allow: TCP 80 (HTTP)
   Allow: TCP 443 (HTTPS)
   Drop:  Everything else

3. Configure DNS (Cloudflare - DNS-only mode):
EOF

echo "   A     atcr.io          → $(curl -s ifconfig.me || echo '[server-ip]')  (gray cloud)"
echo "   A     hold01.atcr.io   → $(curl -s ifconfig.me || echo '[server-ip]')  (gray cloud)"
echo "   CNAME blobs.atcr.io    → atcr.us-chi1.upcloudobjects.com  (gray cloud)"

cat <<'EOF'

4. Start ATCR:
   systemctl start atcr

5. Complete Hold OAuth registration:
   /opt/atcr/get-hold-oauth.sh

   Visit the OAuth URL in your browser to authorize the hold service.

6. Check status:
   systemctl status atcr
   docker ps
   /opt/atcr/logs.sh

Helper Scripts:
  /opt/atcr/rebuild.sh          - Rebuild and restart containers
  /opt/atcr/logs.sh [service]   - View logs (e.g., logs.sh atcr-hold)
  /opt/atcr/get-hold-oauth.sh   - Get hold OAuth URL

Service Management:
  systemctl start atcr          - Start ATCR
  systemctl stop atcr           - Stop ATCR
  systemctl restart atcr        - Restart ATCR
  systemctl status atcr         - Check status

Documentation:
  https://tangled.org/@evan.jarrett.net/at-container-registry

IMPORTANT:
  - Edit /opt/atcr/.env with S3 credentials before starting!
  - Configure UpCloud cloud firewall (see step 2)
  - DNS must be configured and propagated
  - Cloudflare proxy must be DISABLED (gray cloud)
  - Complete hold OAuth registration before first push

EOF

log_info "Installation complete. Follow the next steps above."