// Main application logic

let debounceTimer = null;
const EXAMPLE_CODE = 'DC2.Dw Gm L W T+ Phvwalt Sk? Cbk--^\\bl+lum B- A+ N? M+++!1 O/ H+++ $ F+o R++ Ac+++! J++ S U- I-- V- Q--- Tc+++[SE] E++';

// DOM elements
const input = document.getElementById('dragon-code-input');
const welcomeMessage = document.getElementById('welcome-message');
const decodedOutput = document.getElementById('decoded-output');
const loadExampleBtn = document.getElementById('load-example');
const clearInputBtn = document.getElementById('clear-input');

// Category sections
const sections = {
    species: document.getElementById('species-content'),
    physical: document.getElementById('physical-content'),
    appearance: document.getElementById('appearance-content'),
    abilities: document.getElementById('abilities-content'),
    life: document.getElementById('life-content'),
    personality: document.getElementById('personality-content'),
    other: document.getElementById('other-content'),
    errors: document.getElementById('errors-content')
};

// Event listeners
input.addEventListener('input', handleInput);
loadExampleBtn.addEventListener('click', loadExample);
clearInputBtn.addEventListener('click', clearInput);

function handleInput() {
    // Debounce input to avoid excessive processing
    clearTimeout(debounceTimer);
    debounceTimer = setTimeout(() => {
        const code = input.value.trim();
        if (code) {
            processCode(code);
        } else {
            showWelcome();
        }
    }, 500);
}

function loadExample() {
    input.value = EXAMPLE_CODE;
    processCode(EXAMPLE_CODE);
}

function clearInput() {
    input.value = '';
    showWelcome();
}

function showWelcome() {
    welcomeMessage.classList.remove('hidden');
    decodedOutput.classList.add('hidden');
}

function processCode(code) {
    try {
        // Parse the Dragon Code
        const parsed = parseDragonCode(code);

        // Decode to human-readable format
        const decoded = decodeDragonCode(parsed);

        // Render the results
        renderResults(decoded, parsed.errors);

    } catch (error) {
        console.error('Error processing code:', error);
        showError('An unexpected error occurred while processing the code.');
    }
}

function renderResults(decoded, errors) {
    // Clear all sections
    Object.values(sections).forEach(section => {
        section.innerHTML = '';
    });

    // Hide welcome, show output
    welcomeMessage.classList.add('hidden');
    decodedOutput.classList.remove('hidden');

    // Render each category
    renderCategory('species', decoded.species);
    renderCategory('physical', decoded.physical);
    renderCategory('appearance', decoded.appearance);
    renderCategory('abilities', decoded.abilities);
    renderCategory('life', decoded.life);
    renderCategory('personality', decoded.personality);
    renderCategory('other', decoded.other);

    // Render errors if any
    if (errors && errors.length > 0) {
        document.getElementById('errors-section').classList.remove('hidden');
        errors.forEach(error => {
            const errorElement = createTraitItem('Warning', error, '', 'warning');
            sections.errors.appendChild(errorElement);
        });
    } else {
        document.getElementById('errors-section').classList.add('hidden');
    }

    // Hide empty sections
    hideEmptySections();
}

function renderCategory(categoryName, items) {
    if (!items || items.length === 0) return;

    const section = sections[categoryName];
    items.forEach(item => {
        const element = createTraitItem(item.label, item.value, item.tag, item.type || 'normal');
        section.appendChild(element);
    });
}

function createTraitItem(label, value, tag, type = 'normal') {
    const div = document.createElement('div');
    div.className = `trait-item ${type}`;

    const labelDiv = document.createElement('div');
    labelDiv.className = 'trait-label';
    labelDiv.textContent = label;

    const valueDiv = document.createElement('div');
    valueDiv.className = 'trait-value';
    valueDiv.textContent = value;

    div.appendChild(labelDiv);
    div.appendChild(valueDiv);

    if (tag) {
        const tagSpan = document.createElement('span');
        tagSpan.className = 'trait-tag';
        tagSpan.textContent = tag;
        div.appendChild(tagSpan);
    }

    return div;
}

function hideEmptySections() {
    const sectionElements = {
        species: document.getElementById('species-section'),
        physical: document.getElementById('physical-section'),
        appearance: document.getElementById('appearance-section'),
        abilities: document.getElementById('abilities-section'),
        life: document.getElementById('life-section'),
        personality: document.getElementById('personality-section'),
        other: document.getElementById('other-section')
    };

    Object.keys(sectionElements).forEach(key => {
        const content = sections[key];
        const section = sectionElements[key];

        if (content.children.length === 0) {
            section.classList.add('hidden');
        } else {
            section.classList.remove('hidden');
        }
    });
}

function showError(message) {
    welcomeMessage.classList.add('hidden');
    decodedOutput.classList.remove('hidden');

    Object.values(sections).forEach(section => {
        section.innerHTML = '';
    });

    document.getElementById('errors-section').classList.remove('hidden');
    const errorElement = createTraitItem('Error', message, '', 'error');
    sections.errors.appendChild(errorElement);

    hideEmptySections();
}