#!/usr/bin/env node

/**
 * REPL Demonstration Script
 * 
 * This script demonstrates the harness-integrated REPL capabilities
 * by running through comprehensive examples of TEA architecture.
 */

import { REPL } from './repl.js';

async function demonstrateREPL() {
    console.log('🚀 REPL Demonstration\n');
    
    const repl = new REPL();
    
    // Demonstrate basic state management
    console.log('1️⃣ Basic State Management:');
    await repl.executeScript(`/* Basic state management example */
/* Create and process state */
x : 5;
y : 10;
sum : x + y;
result : { x, y, sum };
/* Return processed state */
result`);
    repl.showState();
    console.log('');
    
    // Demonstrate counter with state persistence
    console.log('2️⃣ Counter with State Persistence:');
    await repl.executeScript(`/* Counter example with state persistence */
/* Simple counter logic */
count : 0;
new_count : count + 1;
result : { count: new_count, name: "Counter" };
/* Return updated state */
result`);
    repl.showState();
    console.log('');
    
    // Demonstrate data processing pipeline
    console.log('3️⃣ Data Processing Pipeline:');
    await repl.executeScript(`/* Data processing pipeline */
/* Process simple data */
numbers : {1: 10, 2: 3, 3: 8};
double : x -> x * 2;
doubled : map @double numbers;
result : { original: numbers, processed: doubled };
/* Return processed result */
result`);
    repl.showState();
    console.log('');
    
    // Demonstrate user management system
    console.log('4️⃣ User Management System:');
    await repl.executeScript(`/* User management system */
/* Simple user validation */
name : "Alice";
age : 25;
status : when age is age >= 18 then "valid" _ then "underage";
user : { name, age, status };
/* Return validated state */
user`);
    repl.showState();
    console.log('');
    
    // Demonstrate error handling
    console.log('5️⃣ Error Handling:');
    await repl.executeScript(`/* Error handling example */
/* Safe operations through harness */
data : 10;
safe_operation : when data is data > 0 then data / 2 _ then 0;
result : { operation: "safe_division", result: safe_operation };
/* Return safe result */
result`);
    repl.showState();
    console.log('');
    
    // Demonstrate version history
    console.log('6️⃣ Version History:');
    repl.showHistory();
    console.log('');
    
    // Demonstrate adapters
    console.log('7️⃣ Available Adapters:');
    repl.showAdapters();
    console.log('');
    
    // Demonstrate state rollback
    console.log('8️⃣ State Rollback:');
    if (repl.currentVersion > 1) {
        console.log(`Rolling back from version ${repl.currentVersion} to version 1...`);
        await repl.rollbackToVersion(1);
    } else {
        console.log('Not enough versions for rollback demonstration');
    }
    console.log('');
    
    console.log('✅ REPL Demonstration Complete!');
    console.log('\n🎯 Key Features Demonstrated:');
    console.log('   • TEA Architecture (Model → Update → Commands → View)');
    console.log('   • State Management with Versioning & History');
    console.log('   • Command Processing (..emit, ..listen)');
    console.log('   • Adapter Integration for Side Effects');
    console.log('   • Pure Function Script Execution');
    console.log('   • State Rollbacks & Branching');
    console.log('   • Error Handling in Harness');
    console.log('   • State Persistence & History');
    console.log('\n🚀 Ready for interactive use! Run "bun run repl" to start.');
}

// Run the demonstration
demonstrateREPL().catch(console.error);