#!/bin/bash

echo "🔍 Validating Docker build setup..."

# Check if required files exist
echo "📁 Checking required files..."
required_files=(
    "package.json"
    "pnpm-lock.yaml"
    "server.js"
    "todo-service.js"
    "signal-crypto.js"
    "public/index.html"
    "public/styles.css"
    "Dockerfile"
    ".dockerignore"
)

missing_files=()
for file in "${required_files[@]}"; do
    if [[ ! -f "$file" ]]; then
        missing_files+=("$file")
    else
        echo "✅ $file"
    fi
done

if [[ ${#missing_files[@]} -gt 0 ]]; then
    echo "❌ Missing files:"
    printf '%s\n' "${missing_files[@]}"
    exit 1
fi

# Validate Node.js syntax
echo ""
echo "🔍 Validating JavaScript syntax..."
if command -v node >/dev/null 2>&1; then
    for js_file in server.js todo-service.js signal-crypto.js; do
        if node -c "$js_file"; then
            echo "✅ $js_file syntax OK"
        else
            echo "❌ $js_file has syntax errors"
            exit 1
        fi
    done
else
    echo "⚠️  Node.js not found, skipping syntax validation"
fi

# Check package.json for required dependencies
echo ""
echo "📦 Checking package.json dependencies..."
if command -v jq >/dev/null 2>&1; then
    required_deps=("express" "uuid" "ws" "dotenv" "@signalapp/libsignal-client")
    for dep in "${required_deps[@]}"; do
        if jq -e ".dependencies.\"$dep\"" package.json >/dev/null; then
            echo "✅ $dep dependency found"
        else
            echo "❌ Missing dependency: $dep"
            exit 1
        fi
    done
else
    echo "⚠️  jq not found, checking dependencies manually..."
    if grep -q '"express"' package.json; then
        echo "✅ express dependency found"
    else
        echo "❌ Missing dependency: express"
        exit 1
    fi
fi

# Validate Dockerfile syntax
echo ""
echo "🐳 Validating Dockerfile..."
if command -v docker >/dev/null 2>&1; then
    if docker build --dry-run . >/dev/null 2>&1; then
        echo "✅ Dockerfile syntax OK"
    else
        echo "❌ Dockerfile has issues"
        exit 1
    fi
else
    echo "⚠️  Docker not found, checking Dockerfile manually..."
    if grep -q "FROM node:" Dockerfile; then
        echo "✅ Dockerfile has Node.js base image"
    else
        echo "❌ Dockerfile missing Node.js base image"
        exit 1
    fi
fi

# Check environment variables
echo ""
echo "🔧 Checking environment setup..."
if [[ -f ".env" ]]; then
    echo "✅ .env file found"
    if grep -q "SQLITE_DB_PATH" .env; then
        echo "✅ SQLITE_DB_PATH configured"
    else
        echo "⚠️  SQLITE_DB_PATH not found in .env"
    fi
else
    echo "⚠️  .env file not found (will use defaults)"
fi

# Estimate Docker image size
echo ""
echo "📊 Estimating build efficiency..."
total_size=$(du -sh . 2>/dev/null | cut -f1)
echo "📁 Project size: $total_size"

if [[ -f ".dockerignore" ]]; then
    ignored_items=$(wc -l < .dockerignore)
    echo "🚫 .dockerignore rules: $ignored_items"
else
    echo "⚠️  No .dockerignore found - build may be slower"
fi

echo ""
echo "✅ Build validation complete!"
echo ""
echo "🚀 To build the Docker image:"
echo "   docker build -t encrypted-todo ."
echo ""
echo "🏃 To run the container:"
echo "   docker run -p 3000:3000 -v todo_data:/app/data encrypted-todo"
echo ""
echo "🔗 To use with Docker Compose:"
echo "   docker compose up --build"