// Integration tests for user scenarios
// These tests should fail initially since the UI controller doesn't exist yet

function testUserScenarios() {
    try {
        // This will fail since UI components don't exist yet
        const calculator = new Calculator();
        const rpnCalculator = new RPNCalculator();
        const stateManager = new StateManager();
        const uiController = new UIController(calculator, rpnCalculator, stateManager);
        
        // Initialize the UI
        uiController.init();
        
        // Test basic calculation: 5 + 3 = 8
        uiController.handleInput('5');
        uiController.handleInput('+');
        uiController.handleInput('3');
        uiController.handleInput('=');
        
        const result = uiController.getCurrentResult();
        if (result !== '8') {
            throw new Error(`Basic calculation failed: 5 + 3 should equal 8, got ${result}`);
        }
        
        // Test complex expression: (2 + 3) * 4 = 20
        uiController.handleInput('(');
        uiController.handleInput('2');
        uiController.handleInput('+');
        uiController.handleInput('3');
        uiController.handleInput(')');
        uiController.handleInput('*');
        uiController.handleInput('4');
        uiController.handleInput('=');
        
        const complexResult = uiController.getCurrentResult();
        if (complexResult !== '20') {
            throw new Error(`Complex calculation failed: (2 + 3) * 4 should equal 20, got ${complexResult}`);
        }
        
        // Test percentage: 100 + 10% = 110
        uiController.handleInput('100');
        uiController.handleInput('+');
        uiController.handleInput('10');
        uiController.handleInput('%');
        uiController.handleInput('=');
        
        const percentResult = uiController.getCurrentResult();
        if (percentResult !== '110') {
            throw new Error(`Percentage calculation failed: 100 + 10% should equal 110, got ${percentResult}`);
        }
        
        // Test RPN mode: 4 ENTER 6 + = 10
        uiController.toggleRPNMode();
        
        uiController.handleRPNInput('4');
        uiController.handleRPNInput('ENTER'); // Enter to push to stack
        uiController.handleRPNInput('6');
        uiController.handleRPNInput('ENTER'); // Enter to push to stack
        uiController.handleRPNInput('+'); // Add operation
        
        // Check RPN result
        const rpnResult = uiController.getCurrentResult();
        if (rpnResult !== '10') {
            throw new Error(`RPN calculation failed: 4 ENTER 6 + should equal 10, got ${rpnResult}`);
        }
        
        // Test history functionality
        const history = uiController.getHistory();
        if (history.length === 0) {
            throw new Error('History functionality not working: no entries found');
        }
        
        // Verify that the last calculation is in history
        const lastHistoryEntry = history[history.length - 1];
        if (!lastHistoryEntry || lastHistoryEntry.result !== 10) {
            throw new Error('History functionality not working: last calculation not properly stored');
        }
        
        // Test keyboard controls
        // This would involve simulating keyboard events
        // For simplicity in this test, we'll just verify the keyboard handler exists
        if (typeof uiController.handleKeyboardInput !== 'function') {
            throw new Error('Keyboard controls not implemented');
        }
        
        // Test that clear operation works
        uiController.handleInput('C'); // Clear
        const clearedResult = uiController.getCurrentResult();
        if (clearedResult !== '0') {
            throw new Error(`Clear operation failed: should reset to 0, got ${clearedResult}`);
        }
        
        return true; // All tests passed
    } catch (error) {
        return { error: error.message };
    }
}

// Add test to global test collection
if (typeof addTest !== 'undefined') {
    addTest('User Scenarios Integration Tests', testUserScenarios);
} else {
    console.log('Test harness not loaded. Run with test runner.');
}