#!/bin/bash

# Convert existing .drone.yml to modular Jsonnet structure
# This script helps migrate from YAML to factorized Jsonnet configuration

echo "🔄 Converting Drone configuration to modular Jsonnet..."

# Generate the final configuration from Jsonnet
echo "📝 Generating .drone.yml from Jsonnet..."
if command -v jsonnet >/dev/null 2>&1; then
    jsonnet .drone.jsonnet > .drone.yml.generated
    echo "✅ Generated .drone.yml.generated from Jsonnet"
    echo ""
    echo "📋 To use the new configuration:"
    echo "1. Review: cat .drone.yml.generated"
    echo "2. Test: python3 -c \"import yaml; yaml.safe_load(open('.drone.yml.generated'))\""
    echo "3. Replace: mv .drone.yml.generated .drone.yml"
    echo "4. Commit: git add .drone.jsonnet common.libsonnet build-steps.libsonnet .drone.yml"
else
    echo "⚠️ jsonnet not installed. Installing..."
    
    # Try to install jsonnet
    if command -v apt-get >/dev/null 2>&1; then
        sudo apt-get update && sudo apt-get install -y jsonnet
    elif command -v apk >/dev/null 2>&1; then
        apk add --no-cache jsonnet
    elif command -v yum >/dev/null 2>&1; then
        sudo yum install -y jsonnet
    else
        echo "❌ Cannot install jsonnet automatically"
        echo "📖 Please install jsonnet manually:"
        echo "   - Ubuntu/Debian: sudo apt-get install jsonnet"
        echo "   - Alpine: apk add jsonnet"
        echo "   - CentOS/RHEL: sudo yum install jsonnet"
        echo "   - Or download from: https://github.com/google/jsonnet"
        exit 1
    fi
    
    # Try generating again
    if command -v jsonnet >/dev/null 2>&1; then
        jsonnet .drone.jsonnet > .drone.yml.generated
        echo "✅ Generated .drone.yml.generated from Jsonnet"
    else
        echo "❌ Failed to install jsonnet"
        exit 1
    fi
fi

echo ""
echo "🎯 Benefits of Jsonnet configuration:"
echo "   ✅ Reusable components (common.libsonnet, build-steps.libsonnet)"
echo "   ✅ Variables and functions"
echo "   ✅ Conditional logic"
echo "   ✅ Better maintainability"
echo "   ✅ DRY principle"
echo ""
echo "📚 Files created:"
echo "   - .drone.jsonnet (main configuration)"
echo "   - common.libsonnet (shared steps and config)"
echo "   - build-steps.libsonnet (build-specific logic)"
echo "   - .drone.yml.generated (generated YAML)"

# Validate the generated YAML
if [ -f ".drone.yml.generated" ]; then
    echo ""
    echo "🔍 Validating generated YAML..."
    if python3 -c "import yaml; yaml.safe_load(open('.drone.yml.generated'))" 2>/dev/null; then
        echo "✅ Generated YAML is valid"
    else
        echo "❌ Generated YAML has syntax errors"
        exit 1
    fi
fi