// Toggle leaderboard visibility
const toggleBtn = document.getElementById('toggleLeaderboard');
const leaderboardSection = document.getElementById('leaderboardSection');
const contentContainer = document.getElementById('contentContainer');

toggleBtn.addEventListener('click', () => {
if (leaderboardSection.style.display === 'none') {
    leaderboardSection.style.display = '';
    toggleBtn.textContent = 'Hide';
    contentContainer.classList.remove('single-column');
} else {
    leaderboardSection.style.display = 'none';
    toggleBtn.textContent = 'Show';
    contentContainer.classList.add('single-column');
}
});

// Problem search functionality
const problemSearch = document.getElementById('problemSearch');
const problemsContainer = document.getElementById('problemsContainer');
const problemItems = problemsContainer.querySelectorAll('.problem-item');

problemSearch.addEventListener('input', () => {
const searchTerm = problemSearch.value.toLowerCase();
problemItems.forEach(item => {
    const name = item.dataset.name.toLowerCase();
    const desc = item.dataset.desc?.toLowerCase() || '';
    if (name.includes(searchTerm) || desc.includes(searchTerm)) {
    item.style.display = '';
    } else {
    item.style.display = 'none';
    }
});
});

// Leaderboard filtering and sorting
const userSearch = document.getElementById('userSearch');
const problemFilter = document.getElementById('problemFilter');
const runtimeFilter = document.getElementById('runtimeFilter');
const leaderboardBody = document.getElementById('leaderboardBody');
const leaderboardRows = Array.from(leaderboardBody.querySelectorAll('tr'));
const sortableHeaders = document.querySelectorAll('.sortable');

// Current sort state
let currentSort = {
column: null,
direction: 'asc'
};

// Filter leaderboard
function filterLeaderboard() {
const userTerm = userSearch.value.toLowerCase();
const problemTerm = problemFilter.value.toLowerCase();
const runtimeType = runtimeFilter.value;

leaderboardRows.forEach(row => {
    const user = row.dataset.user.toLowerCase();
    const problem = row.dataset.problem.toLowerCase();
    const runtime = parseFloat(row.dataset.runtime);
    const showUser = user.includes(userTerm);
    const showProblem = problem.includes(problemTerm);
    
    let showRuntime = true;
    if (runtimeType === 'best') {
    // Find if this is the best runtime for this user+problem combo
    const userProblemRows = leaderboardRows.filter(r => 
        r.dataset.user === row.dataset.user && 
        r.dataset.problem === row.dataset.problem
    );
    const bestRuntime = Math.min(...userProblemRows.map(r => parseFloat(r.dataset.runtime)));
    showRuntime = runtime === bestRuntime;
    } else if (runtimeType === 'worst') {
    // Find if this is the worst runtime for this user+problem combo
    const userProblemRows = leaderboardRows.filter(r => 
        r.dataset.user === row.dataset.user && 
        r.dataset.problem === row.dataset.problem
    );
    const worstRuntime = Math.max(...userProblemRows.map(r => parseFloat(r.dataset.runtime)));
    showRuntime = runtime === worstRuntime;
    }

    if (showUser && showProblem && showRuntime) {
    row.style.display = '';
    } else {
    row.style.display = 'none';
    }
});
}

// Sort leaderboard
function sortLeaderboard(column, direction) {
const rows = Array.from(leaderboardBody.querySelectorAll('tr'));
const index = Array.from(document.querySelectorAll('th')).findIndex(th => th.dataset.sort === column);

rows.sort((a, b) => {
    let aValue = a.cells[index].textContent;
    let bValue = b.cells[index].textContent;
    
    // Special handling for numeric columns
    if (column === 'runtime' || column === 'memory' || column === 'rank') {
    aValue = parseFloat(aValue) || 0;
    bValue = parseFloat(bValue) || 0;
    return direction === 'asc' ? aValue - bValue : bValue - aValue;
    }
    
    // Special handling for timestamps
    if (column === 'timestamp') {
    aValue = new Date(aValue).getTime();
    bValue = new Date(bValue).getTime();
    return direction === 'asc' ? aValue - bValue : bValue - aValue;
    }
    
    // Default string comparison
    aValue = aValue.toLowerCase();
    bValue = bValue.toLowerCase();
    if (aValue < bValue) return direction === 'asc' ? -1 : 1;
    if (aValue > bValue) return direction === 'asc' ? 1 : -1;
    return 0;
});

// Re-append rows in sorted order
rows.forEach(row => leaderboardBody.appendChild(row));
}

// Set up event listeners
userSearch.addEventListener('input', filterLeaderboard);
problemFilter.addEventListener('input', filterLeaderboard);
runtimeFilter.addEventListener('change', filterLeaderboard);

// Set up sorting
sortableHeaders.forEach(header => {
header.addEventListener('click', () => {
    const column = header.dataset.sort;
    
    // Reset all sort indicators
    sortableHeaders.forEach(h => {
    h.classList.remove('sort-asc', 'sort-desc');
    });
    
    // Determine new sort direction
    if (currentSort.column === column) {
    currentSort.direction = currentSort.direction === 'asc' ? 'desc' : 'asc';
    } else {
    currentSort.column = column;
    currentSort.direction = 'asc';
    }
    
    // Apply new sort
    header.classList.add(`sort-${currentSort.direction}`);
    sortLeaderboard(column, currentSort.direction);
});
});