// Advanced test file for string operations and control flow
// Run with: node test-advanced.js

const ForthInterpreter = require('./forth.js');

console.log('🧪 Testing Advanced 4-Stack Forth Features\n');

// Test 1: String literals
console.log('Test 1: String literals');
let state = ForthInterpreter.createInitialState();
state = ForthInterpreter.parseAndExecute(state, '." Hello World"');
console.log('Stack 1 after string literal:', state.stacks[0]);
console.log('Expected: ["Hello World"]\n');

// Test 2: String operations
console.log('Test 2: String operations');
state = ForthInterpreter.parseAndExecute(state, 'dup strlen');
console.log('Stack 1 after strlen:', state.stacks[0]);
console.log('Expected: ["Hello World", 11]\n');

// Test 3: String concatenation
console.log('Test 3: String concatenation');
state = ForthInterpreter.parseAndExecute(state, '."  from Forth" strcat');
console.log('Stack 1 after strcat:', state.stacks[0]);
console.log('Expected: ["Hello World from Forth"]\n');

// Test 4: Basic control flow - IF THEN
console.log('Test 4: Basic control flow - IF THEN');
state = ForthInterpreter.parseAndExecute(state, '5 3 > if ." Greater" then');
console.log('Output:', state.output[state.output.length - 1]);
console.log('Expected: "Greater"\n');

// Test 5: Control flow with false condition
console.log('Test 5: Control flow with false condition');
state = ForthInterpreter.parseAndExecute(state, '3 5 > if ." Greater" then');
console.log('Output:', state.output[state.output.length - 1]);
console.log('Expected: No output (condition was false)\n');

// Test 6: IF ELSE THEN
console.log('Test 6: IF ELSE THEN');
state = ForthInterpreter.parseAndExecute(state, '5 3 > if ." Greater" else ." Less or Equal" then');
console.log('Output:', state.output[state.output.length - 1]);
console.log('Expected: "Greater"\n');

// Test 7: IF ELSE THEN with false condition
console.log('Test 7: IF ELSE THEN with false condition');
state = ForthInterpreter.parseAndExecute(state, '3 5 > if ." Greater" else ." Less or Equal" then');
console.log('Output:', state.output[state.output.length - 1]);
console.log('Expected: "Less or Equal"\n');

// Test 8: BEGIN UNTIL loop
console.log('Test 8: BEGIN UNTIL loop');
state = ForthInterpreter.parseAndExecute(state, '5 begin dup ." Loop " 1 - dup 0 = until drop');
console.log('Output:', state.output.slice(-5));
console.log('Expected: 5 loop iterations\n');

// Test 9: Complex control flow
console.log('Test 9: Complex control flow');
state = ForthInterpreter.parseAndExecute(state, '10 begin dup 0 > if dup ." Count: " . 1 - else drop 0 then dup 0 = until');
console.log('Output:', state.output.slice(-10));
console.log('Expected: Countdown from 10 to 1\n');

// Test 10: String manipulation with control flow
console.log('Test 10: String manipulation with control flow');
state = ForthInterpreter.parseAndExecute(state, '." Test" dup strlen 5 > if ." Long string" else ." Short string" then');
console.log('Output:', state.output.slice(-3));
console.log('Expected: "Test", "Short string"\n');

// Test 11: Nested control flow
console.log('Test 11: Nested control flow');
state = ForthInterpreter.parseAndExecute(state, '7 dup 5 > if dup 10 > if ." Very large" else ." Large" then else dup 3 > if ." Medium" else ." Small" then then');
console.log('Output:', state.output[state.output.length - 1]);
console.log('Expected: "Large"\n');

// Test 12: String operations with numbers
console.log('Test 12: String operations with numbers');
state = ForthInterpreter.parseAndExecute(state, '." Hello" 32 char+');
console.log('Stack 1 after char+:', state.stacks[0]);
console.log('Expected: ["Hello "]\n');

console.log('✅ All advanced tests completed!');
console.log('\nFinal state:');
console.log('Stack 1:', state.stacks[0]);
console.log('Stack 2:', state.stacks[1]);
console.log('Stack 3:', state.stacks[2]);
console.log('Stack 4:', state.stacks[3]);
console.log('Dictionary size:', state.dictionary.size);
console.log('Output messages:', state.output.length);

// Show some example outputs
console.log('\nSample outputs:');
state.output.slice(-5).forEach((msg, i) => {
    console.log(`${i + 1}. ${msg}`);
});