#!/bin/bash

set -euo pipefail

echo "=== Docker-in-Docker Example for Gitea Actions ==="
echo "JOB_CONTAINER_NAME: ${JOB_CONTAINER_NAME:-not set}"
echo "GITHUB_WORKSPACE: ${GITHUB_WORKSPACE:-$(pwd)}"
echo ""

# Create a simple Dockerfile for testing
cat > Dockerfile.test << 'EOF'
FROM alpine:latest
RUN apk add --no-cache bash
WORKDIR /app
COPY . .
CMD ["bash", "-c", "echo 'Hello from Docker container!' && ls -la"]
EOF

# Create a test file
echo "This is a test file created in Gitea Actions" > test-data.txt

if [ -n "${JOB_CONTAINER_NAME:-}" ]; then
    echo "Running in Gitea Actions - using --volumes-from for Docker operations"
    echo ""
    
    # Build the Docker image
    echo "1. Building Docker image..."
    docker build -f Dockerfile.test -t test-image:latest .
    echo ""
    
    # Run container with volumes from the job container
    echo "2. Running Docker container with shared volumes..."
    docker run --rm \
        --volumes-from="${JOB_CONTAINER_NAME}" \
        -w "${GITHUB_WORKSPACE}" \
        test-image:latest
    echo ""
    
    # Example: Running a command that needs access to workspace files
    echo "3. Running Alpine container to process workspace files..."
    docker run --rm \
        --volumes-from="${JOB_CONTAINER_NAME}" \
        alpine:latest sh -c "cd ${GITHUB_WORKSPACE} && echo 'Files in workspace:' && find . -type f -name '*.txt' | head -10"
    echo ""
    
    # Example: Using docker-compose (if needed)
    echo "4. Creating docker-compose.yml for multi-container setup..."
    cat > docker-compose.test.yml << EOF
version: '3'
services:
  app:
    image: alpine:latest
    volumes_from:
      - ${JOB_CONTAINER_NAME}
    working_dir: ${GITHUB_WORKSPACE}
    command: ["sh", "-c", "echo 'Hello from docker-compose!' && ls -la"]
EOF
    
    # Note: docker-compose with volumes_from requires special handling
    echo "Note: For docker-compose, you may need to use docker run instead or configure the runner differently"
    
else
    echo "Running locally - using standard volume mounts"
    echo ""
    
    # Build the Docker image
    echo "1. Building Docker image..."
    docker build -f Dockerfile.test -t test-image:latest .
    echo ""
    
    # Run container with local volume mount
    echo "2. Running Docker container with local volume..."
    docker run --rm -v "$(pwd):/app" test-image:latest
    echo ""
    
    # Example: Running Alpine with local mount
    echo "3. Running Alpine container with local mount..."
    docker run --rm -v "$(pwd):/workspace" -w /workspace alpine:latest sh -c "echo 'Files in workspace:' && find . -type f -name '*.txt' | head -10"
fi

# Cleanup
rm -f Dockerfile.test test-data.txt docker-compose.test.yml

echo ""
echo "=== Example completed successfully ==="