/**
 * ATM Interface
 * Handles banking transactions with PIN authentication
 */

// ============================================================================
// STATE
// ============================================================================

let enteredPin = '';
let currentView = 'welcomeView';
let previousView = 'welcomeView';
// ============================================================================
// VIEW MANAGEMENT
// ============================================================================

function showView(viewId) {
    // Hide all views
    document.querySelectorAll('.atm-view').forEach(view => {
        view.style.display = 'none';
    });

    // Show selected view
    const view = document.getElementById(viewId);
    if (view) {
        view.style.display = 'flex';
        previousView = currentView;
        currentView = viewId;

        // Update balance displays when showing certain views
        if (viewId === 'menuView' || viewId === 'balanceView' || viewId === 'depositView') {
            updateBalances();
        }
    }
}

// ============================================================================
// PIN AUTHENTICATION
// ============================================================================

function generateKeypad() {
    const keypad = document.getElementById('keypad');
    if (!keypad) return;

    // Define keypad layout
    const keys = [
        { value: '1', label: '1', type: 'number' },
        { value: '2', label: '2', type: 'number' },
        { value: '3', label: '3', type: 'number' },
        { value: '4', label: '4', type: 'number' },
        { value: '5', label: '5', type: 'number' },
        { value: '6', label: '6', type: 'number' },
        { value: '7', label: '7', type: 'number' },
        { value: '8', label: '8', type: 'number' },
        { value: '9', label: '9', type: 'number' },
        { value: 'clear', label: 'Clear', type: 'action', class: 'key-clear' },
        { value: '0', label: '0', type: 'number' },
        { value: 'enter', label: 'Enter', type: 'action', class: 'key-enter' }
    ];

    // Clear existing keypad
    keypad.innerHTML = '';

    // Generate buttons
    keys.forEach(key => {
        const button = document.createElement('button');
        button.className = `key-btn${key.class ? ' ' + key.class : ''}`;
        button.textContent = key.label;

        // Add click handler
        if (key.type === 'number') {
            button.onclick = () => enterPin(key.value);
        } else if (key.value === 'clear') {
            button.onclick = () => clearPin();
        } else if (key.value === 'enter') {
            button.onclick = () => submitPin();
        }

        keypad.appendChild(button);
    });
}

function enterPin(digit) {
    if (enteredPin.length < 4) {
        enteredPin += digit;
        updatePinDisplay();
    }
}

function clearPin() {
    enteredPin = '';
    updatePinDisplay();
}

function updatePinDisplay() {
    const dots = document.querySelectorAll('.pin-dot');
    dots.forEach((dot, index) => {
        if (index < enteredPin.length) {
            dot.classList.add('filled');
        } else {
            dot.classList.remove('filled');
        }
    });
}

function submitPin() {
    if (enteredPin.length !== 4) {
        showError('Please enter a 4-digit PIN');
        return;
    }

    // In a real implementation, this would validate with the server
    const currentState = store.getState();
    if (enteredPin === currentState.pin) {
        enteredPin = '';
        updatePinDisplay();
        showView('menuView');
    } else {
        showError('Incorrect PIN');
        clearPin();
    }
}

// ============================================================================
// BALANCE MANAGEMENT
// ============================================================================

function updateBalances() {
    const currentState = store.getState();

    // Update all balance displays
    const cashElements = ['cashBalance', 'cashBalanceDetail', 'availableCash'];
    const bankElements = ['bankBalance', 'bankBalanceDetail'];

    cashElements.forEach(id => {
        const el = document.getElementById(id);
        if (el) el.textContent = `$${currentState.accounts.cash.toLocaleString()}`;
    });

    bankElements.forEach(id => {
        const el = document.getElementById(id);
        if (el) el.textContent = `$${currentState.accounts.bank.toLocaleString()}`;
    });

    const totalEl = document.getElementById('totalBalance');
    if (totalEl) {
        const total = currentState.accounts.cash + currentState.accounts.bank;
        totalEl.textContent = `$${total.toLocaleString()}`;
    }
}

// ============================================================================
// WITHDRAW OPERATIONS
// ============================================================================

function withdrawAmount(amount) {
    const currentState = store.getState();

    if (amount > currentState.accounts.bank) {
        showError('Insufficient funds');
        return;
    }

    store.dispatch(withdraw(amount));
    sendEvent('atm::withdraw', { amount: amount });
    showSuccess(`Withdrew $${amount.toLocaleString()}`);
}

function withdrawCustom() {
    const input = document.getElementById('withdrawInput');
    const amount = parseFloat(input.value);

    if (!amount || amount <= 0) {
        showError('Please enter a valid amount');
        return;
    }

    const currentState = store.getState();
    if (amount > currentState.accounts.bank) {
        showError('Insufficient funds');
        return;
    }

    store.dispatch(withdraw(amount));
    sendEvent('atm::withdraw', { amount: amount });
    input.value = '';
    showSuccess(`Withdrew $${amount.toLocaleString()}`);
}

// ============================================================================
// DEPOSIT OPERATIONS
// ============================================================================

/**
 * Deposits specified amount into bank account
 * @deprecated Use store actions instead
 */
function depositAmount() {
    const input = document.getElementById('depositInput');
    const amount = parseFloat(input.value);

    if (!amount || amount <= 0) {
        showError('Please enter a valid amount');
        return;
    }

    const currentState = store.getState();
    if (amount > currentState.accounts.cash) {
        showError('Insufficient cash');
        return;
    }

    store.dispatch(deposit(amount));
    sendEvent('atm::deposit', { amount: amount });
    input.value = '';
    showSuccess(`Deposited $${amount.toLocaleString()}`);
}
/**
 * Deposits all available cash into bank account
 * @deprecated Use store actions instead
 */
function depositAll() {
    const currentState = store.getState();

    if (currentState.accounts.cash <= 0) {
        showError('No cash to deposit');
        return;
    }

    const amount = currentState.accounts.cash;
    store.dispatch(deposit(amount));
    sendEvent('atm::deposit', { amount: amount });
    showSuccess(`Deposited $${amount.toLocaleString()}`);
}

// ============================================================================
// TRANSFER OPERATIONS
// ============================================================================
/**
 * Transfers specified amount from bank account to player account
 * @deprecated Use store actions instead
 */
function transferFunds() {
    const playerIdInput = document.getElementById('transferPlayerId');
    const amountInput = document.getElementById('transferAmount');

    const playerId = playerIdInput.value.trim();
    const amount = parseFloat(amountInput.value);

    if (!playerId) {
        showError('Please enter a player ID');
        return;
    }

    if (!amount || amount <= 0) {
        showError('Please enter a valid amount');
        return;
    }

    const currentState = store.getState();
    if (amount > currentState.accounts.bank) {
        showError('Insufficient funds');
        return;
    }

    store.dispatch(transfer('bank', amount, 'player'));
    sendEvent('atm::transfer', {
        playerId: playerId,
        amount: amount
    });

    playerIdInput.value = '';
    amountInput.value = '';

    showSuccess(`Transferred $${amount.toLocaleString()} to Player ${playerId}`);
}

// ============================================================================
// RESULT SCREENS
// ============================================================================

function showSuccess(message) {
    document.getElementById('successMessage').textContent = message;
    showView('successView');
    updateBalances();
}

function showError(message) {
    document.getElementById('errorMessage').textContent = message;
    showView('errorView');
}

function goBackFromError() {
    // If error happened during PIN entry, go back to PIN view
    // Otherwise go back to menu view
    if (previousView === 'pinView') {
        showView('pinView');
    } else {
        showView('menuView');
    }
}

// ============================================================================
// ATM CONTROL
// ============================================================================

function exitATM() {
    enteredPin = '';
    updatePinDisplay();
    sendEvent('atm::close', {});
    showView('welcomeView');
}

// ============================================================================
// ARMA 3 INTEGRATION
// ============================================================================

/**
 * Sends an event to Arma 3
 * @param {string} event - Event name
 * @param {Object} data - Event data
 */
function sendEvent(event, data) {
    if (typeof A3API !== 'undefined') {
        A3API.SendAlert(JSON.stringify({
            event: event,
            data: data
        }));
    } else {
        console.log('Event:', event, 'Data:', data);
    }
}

// ============================================================================
// INITIALIZATION
// ============================================================================

function initATM() {
    // Subscribe to store updates
    if (typeof store !== 'undefined') {
        store.subscribe(() => {
            updateBalances();
        });
    }

    // Generate keypad
    generateKeypad();

    // Show welcome screen
    showView('welcomeView');

    // Update initial balances
    updateBalances();

    console.log('[ATM] Interface initialized');
}

// Auto-initialize
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initATM);
} else {
    initATM();
}

// ============================================================================
// GLOBAL EXPORTS
// ============================================================================

window.showView = showView;
window.generateKeypad = generateKeypad;
window.enterPin = enterPin;
window.clearPin = clearPin;
window.submitPin = submitPin;
window.withdrawAmount = withdrawAmount;
window.withdrawCustom = withdrawCustom;
window.depositAmount = depositAmount;
window.depositAll = depositAll;
window.transferFunds = transferFunds;
window.goBackFromError = goBackFromError;
window.exitATM = exitATM;