#!/bin/bash
# Demo 4: Cross-Compilation Strategy - Rust Meetup 2025
# Demostración de capacidades multi-arquitectura

set -euo pipefail

echo "🔧 Demo 4: Cross-Compilation Strategy"
echo "====================================="

# Colores para output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

log() {
    echo -e "${GREEN}[$(date +'%H:%M:%S')]${NC} $1"
}

warn() {
    echo -e "${YELLOW}[$(date +'%H:%M:%S')] WARN:${NC} $1"
}

error() {
    echo -e "${RED}[$(date +'%H:%M:%S')] ERROR:${NC} $1"
}

# Parte 1: Auto-detección de arquitectura
echo ""
log "Parte 1: Auto-detección de arquitectura"
echo "========================================"

detect_arch() {
    local arch=$(uname -m)
    case $arch in
        x86_64)
            echo "x86_64-unknown-linux-gnu"
            ;;
        aarch64|arm64)
            echo "aarch64-unknown-linux-gnu"
            ;;
        armv7l)
            echo "armv7-unknown-linux-gnueabihf"
            ;;
        *)
            echo "unsupported"
            ;;
    esac
}

CURRENT_ARCH=$(detect_arch)
log "Arquitectura detectada: $CURRENT_ARCH"
log "Sistema: $(uname -s) $(uname -m)"

# Mostrar targets soportados
echo ""
log "Targets de compilación soportados:"
SUPPORTED_TARGETS=(
    "x86_64-unknown-linux-gnu"
    "aarch64-unknown-linux-gnu"
    "x86_64-apple-darwin"
    "aarch64-apple-darwin"
    "x86_64-pc-windows-gnu"
)

for target in "${SUPPORTED_TARGETS[@]}"; do
    if [ "$target" == "$CURRENT_ARCH" ]; then
        echo "  ✅ $target (actual)"
    else
        echo "  📦 $target"
    fi
done

# Parte 2: Instalación de cross-compilation tools
echo ""
log "Parte 2: Setup de herramientas cross-compilation"
echo "================================================"

echo "$ cargo install cross --git https://github.com/cross-rs/cross"
log "✅ Cross-compilation tool instalado"

echo "$ rustup target add aarch64-unknown-linux-gnu"
echo "$ rustup target add x86_64-unknown-linux-gnu"
log "✅ Targets de Rust añadidos"

# Parte 3: Configuración para herramientas Rust
echo ""
log "Parte 3: Configuración para herramientas del ecosistema"
echo "======================================================"

# Simular Cross.toml configuration
cat << 'EOF'
📄 Cross.toml configuración:
```toml
[build.env]
passthrough = [
    "CARGO_HOME",
    "CARGO_TARGET_DIR",
]

[target.aarch64-unknown-linux-gnu]
dockerfile = "./docker/Dockerfile.aarch64"
image = "rust-cross:aarch64"

[target.x86_64-unknown-linux-gnu]  
dockerfile = "./docker/Dockerfile.x86_64"
image = "rust-cross:x86_64"
```
EOF

# Parte 4: Build script inteligente
echo ""
log "Parte 4: Build script multi-arquitectura"
echo "========================================"

build_for_target() {
    local target=$1
    local component=$2
    
    log "Compilando $component para $target..."
    
    # Simular proceso de build
    case $component in
        "youki")
            echo "  🦀 Compilando youki (OCI runtime)..."
            echo "  📦 Features: seccomp, systemd, v2"
            ;;
        "cosmian-kms-client")
            echo "  🔐 Compilando cliente Cosmian KMS..."
            echo "  📦 Features: tls, async-tokio"
            ;;
        "polkadot-node")
            echo "  🕸️ Compilando nodo Polkadot..."
            echo "  📦 Features: runtime-benchmarks"
            ;;
    esac
    
    sleep 1
    log "✅ $component compilado para $target"
}

# Simular builds para diferentes componentes
RUST_COMPONENTS=("youki" "cosmian-kms-client" "polkadot-node")

for component in "${RUST_COMPONENTS[@]}"; do
    build_for_target "x86_64-unknown-linux-gnu" "$component"
    build_for_target "aarch64-unknown-linux-gnu" "$component"
done

# Parte 5: Packaging inteligente
echo ""
log "Parte 5: Packaging multi-arquitectura"
echo "===================================="

package_release() {
    local target=$1
    local version=${2:-"v1.0.0"}
    
    log "Empaquetando release para $target..."
    
    # Simular estructura de package
    echo "  📁 provisioning-$version-$target/"
    echo "  ├── bin/"
    echo "  │   ├── provisioning"
    echo "  │   ├── youki"
    echo "  │   └── cosmian-kms-client"
    echo "  ├── lib/"
    echo "  │   └── nu_plugins/"
    echo "  ├── templates/"
    echo "  └── install.sh"
    
    echo "  📦 Creando tarball..."
    echo "  ✅ provisioning-$version-$target.tar.gz"
}

for target in "x86_64-unknown-linux-gnu" "aarch64-unknown-linux-gnu"; do
    package_release "$target" "v1.0.0"
done

# Parte 6: Deploy automático según arquitectura
echo ""
log "Parte 6: Deploy inteligente por arquitectura"
echo "============================================"

simulate_deploy() {
    local server_ip=$1
    local server_arch=$2
    
    log "Desplegando en servidor $server_ip ($server_arch)..."
    
    # Detectar arquitectura del servidor (simulado)
    echo "  🔍 Detectando arquitectura del servidor..."
    echo "  📡 SSH: ssh user@$server_ip 'uname -m'"
    echo "  📋 Resultado: $server_arch"
    
    # Seleccionar package correcto
    local package_name="provisioning-v1.0.0-$server_arch-unknown-linux-gnu.tar.gz"
    echo "  📦 Seleccionando package: $package_name"
    
    # Simular deploy
    echo "  🚀 Transfiriendo archivos..."
    echo "  📥 scp $package_name user@$server_ip:/tmp/"
    echo "  🔧 Instalando remotamente..."
    echo "  ✅ Deploy completado"
}

# Simular deploy en diferentes arquitecturas
simulate_deploy "203.0.113.10" "x86_64"
simulate_deploy "203.0.113.11" "aarch64"
simulate_deploy "203.0.113.12" "x86_64"

# Parte 7: Ventajas del enfoque
echo ""
log "Parte 7: Ventajas de cross-compilation nativa"
echo "=============================================="

echo "💰 Costos optimizados:"
echo "  - ARM instances ~20% más baratas que x86"
echo "  - Graviton3: $0.04/hora vs t3.medium: $0.05/hora"
echo "  - Ahorro anual: ~$87 por instancia"

echo ""
echo "⚡ Performance:"
echo "  - Binarios nativos vs containers emulados"
echo "  - youki en ARM: ~15% menos overhead vs Docker"
echo "  - Polkadot: ~25% mejor throughput en Graviton"

echo ""
echo "🌐 Alcance:"
echo "  - Edge computing: ARM dominante en IoT"
echo "  - Mobile development: aarch64 nativo"
echo "  - Apple Silicon: Mejor developer experience"

echo ""
echo "🔧 Operaciones:"
echo "  - Un solo build system para todo"
echo "  - Deploy automático según arquitectura destino"
echo "  - Testing unificado cross-platform"

# Parte 8: Comparación con alternativas
echo ""
log "Parte 8: vs. Alternativas tradicionales"
echo "======================================="

echo "📊 Comparación con Docker multi-arch:"
echo ""
printf "%-20s %-15s %-15s\n" "Aspecto" "Cross-compile" "Docker buildx"
printf "%-20s %-15s %-15s\n" "Build time" "~3 min" "~15 min"
printf "%-20s %-15s %-15s\n" "Binary size" "~25MB" "~250MB"
printf "%-20s %-15s %-15s\n" "Runtime overhead" "0%" "5-10%"
printf "%-20s %-15s %-15s\n" "Cold start" "Inmediato" "~2-3s"
printf "%-20s %-15s %-15s\n" "Complexity" "Media" "Alta"

# Parte 9: Script de automatización
echo ""
log "Parte 9: Script de automatización completo"
echo "=========================================="

cat << 'EOF'
#!/bin/bash
# build-all.sh - Build script completo

TARGETS=("x86_64-unknown-linux-gnu" "aarch64-unknown-linux-gnu")
COMPONENTS=("youki" "cosmian-kms-client" "polkadot-node")

for target in "${TARGETS[@]}"; do
    for component in "${COMPONENTS[@]}"; do
        echo "Building $component for $target..."
        cross build --release --target "$target" \
            --manifest-path "tools/$component/Cargo.toml"
    done
    
    # Package release
    mkdir -p "dist/$target"
    cp target/$target/release/* "dist/$target/"
    tar czf "provisioning-$target.tar.gz" -C "dist/$target" .
done

echo "✅ All builds completed!"
EOF

echo ""
log "🎯 Demo cross-compilation completada!"
echo ""
echo "⭐ Capacidades demostradas:"
echo "   - Auto-detección de arquitectura"
echo "   - Build multi-target automatizado"
echo "   - Packaging inteligente"
echo "   - Deploy automático por arquitectura"
echo "   - Optimizaciones de costo y performance"

echo ""
echo "🚀 Para implementar en tu proyecto:"
echo "1. cargo install cross"
echo "2. rustup target add aarch64-unknown-linux-gnu"
echo "3. Configurar Cross.toml"
echo "4. Crear scripts de automatización"
echo "5. ¡Disfrutar de deploys multi-arch!"