// API Base URL
const API_BASE = '/claude/api';

// State
let currentFile = null;
let isEditing = false;
let fileTree = [];

// DOM Elements
const loginScreen = document.getElementById('login-screen');
const mainApp = document.getElementById('main-app');
const loginForm = document.getElementById('login-form');
const loginError = document.getElementById('login-error');
const logoutBtn = document.getElementById('logout-btn');
const searchInput = document.getElementById('search-input');
const fileTreeEl = document.getElementById('file-tree');
const recentFilesEl = document.getElementById('recent-files');
const contentView = document.getElementById('content-view');
const contentEditor = document.getElementById('content-editor');
const breadcrumb = document.getElementById('breadcrumb');
const editBtn = document.getElementById('edit-btn');
const saveBtn = document.getElementById('save-btn');
const cancelBtn = document.getElementById('cancel-btn');

// Initialize
document.addEventListener('DOMContentLoaded', () => {
    checkAuth();
    setupEventListeners();
});

function setupEventListeners() {
    // Login form
    const loginForm = document.getElementById('login-form');
    if (loginForm) {
        loginForm.addEventListener('submit', handleLogin);
    }

    // Logout
    const logoutBtn = document.getElementById('logout-btn');
    if (logoutBtn) {
        logoutBtn.addEventListener('click', handleLogout);
    }

    // Search
    const searchInput = document.getElementById('search-input');
    if (searchInput) {
        let searchTimeout;
        searchInput.addEventListener('input', (e) => {
            clearTimeout(searchTimeout);
            searchTimeout = setTimeout(() => handleSearch(e.target.value), 300);
        });
    }

    // Edit/Save/Cancel buttons
    const editBtn = document.getElementById('edit-btn');
    const saveBtn = document.getElementById('save-btn');
    const cancelBtn = document.getElementById('cancel-btn');

    if (editBtn) {
        editBtn.addEventListener('click', startEditing);
    }
    if (saveBtn) {
        saveBtn.addEventListener('click', saveFile);
    }
    if (cancelBtn) {
        cancelBtn.addEventListener('click', stopEditing);
    }
}

// Auth functions
async function checkAuth() {
    try {
        const res = await fetch(`${API_BASE}/auth/status`);
        const data = await res.json();

        if (data.authenticated) {
            // Redirect to landing page if authenticated
            window.location.href = '/claude/';
        } else {
            showLogin();
        }
    } catch (error) {
        console.error('Auth check failed:', error);
        showLogin();
    }
}

async function handleLogin(e) {
    e.preventDefault();
    const username = document.getElementById('username').value;
    const password = document.getElementById('password').value;

    try {
        const res = await fetch(`${API_BASE}/login`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ username, password })
        });

        const data = await res.json();

        if (data.success) {
            // Redirect to landing page after successful login
            window.location.href = '/claude/';
        } else {
            loginError.textContent = data.error || 'Login failed';
        }
    } catch (error) {
        loginError.textContent = 'Network error. Please try again.';
    }
}

async function handleLogout() {
    try {
        await fetch(`${API_BASE}/logout`, { method: 'POST' });
        showLogin();
    } catch (error) {
        console.error('Logout failed:', error);
    }
}

function showLogin() {
    loginScreen.style.display = 'flex';
    mainApp.style.display = 'none';
}

function showApp() {
    loginScreen.style.display = 'none';
    mainApp.style.display = 'flex';
    loadFileTree();
    loadRecentFiles();
}

// File functions
async function loadFileTree() {
    try {
        const res = await fetch(`${API_BASE}/files`);
        const data = await res.json();
        fileTree = data.tree;
        renderFileTree(fileTree, fileTreeEl);
    } catch (error) {
        console.error('Failed to load file tree:', error);
    }
}

function renderFileTree(tree, container, level = 0) {
    container.innerHTML = '';

    tree.forEach(item => {
        const div = document.createElement('div');
        div.className = 'tree-item ' + item.type;
        div.style.paddingLeft = (level * 1 + 0.75) + 'rem';

        const icon = document.createElement('span');
        icon.className = 'tree-icon';
        icon.textContent = item.type === 'folder' ? '📁' : '📄';
        div.appendChild(icon);

        const name = document.createElement('span');
        name.textContent = item.name;
        div.appendChild(name);

        if (item.type === 'folder' && item.children) {
            const children = document.createElement('div');
            children.className = 'tree-children';
            children.style.display = 'none';

            div.addEventListener('click', () => {
                children.style.display = children.style.display === 'none' ? 'block' : 'none';
                icon.textContent = children.style.display === 'none' ? '📁' : '📂';
            });

            renderFileTree(item.children, children, level + 1);
            div.appendChild(children);
        } else if (item.type === 'file') {
            div.addEventListener('click', () => loadFile(item.path));
        }

        container.appendChild(div);
    });
}

async function loadRecentFiles() {
    try {
        const res = await fetch(`${API_BASE}/recent?limit=10`);
        const data = await res.json();

        recentFilesEl.innerHTML = '';
        data.files.forEach(file => {
            const li = document.createElement('li');
            li.textContent = file.name;
            li.title = file.path;
            li.addEventListener('click', () => loadFile(file.path));
            recentFilesEl.appendChild(li);
        });
    } catch (error) {
        console.error('Failed to load recent files:', error);
    }
}

async function loadFile(filePath) {
    try {
        const res = await fetch(`${API_BASE}/file/${encodeURIComponent(filePath)}`);
        const data = await res.json();

        if (data.error) {
            console.error('Error loading file:', data.error);
            return;
        }

        currentFile = data;
        breadcrumb.textContent = data.path;
        contentView.innerHTML = data.html;
        contentEditor.value = data.content;

        editBtn.style.display = 'inline-block';
        stopEditing();
    } catch (error) {
        console.error('Failed to load file:', error);
    }
}

async function handleSearch(query) {
    if (!query.trim()) {
        return;
    }

    try {
        const res = await fetch(`${API_BASE}/search?q=${encodeURIComponent(query)}`);
        const data = await res.json();

        // Show search results in file tree
        fileTreeEl.innerHTML = '';

        if (data.results.length === 0) {
            fileTreeEl.innerHTML = '<div style="padding: 1rem; color: var(--text-secondary);">No results found</div>';
            return;
        }

        data.results.forEach(result => {
            const div = document.createElement('div');
            div.className = 'tree-item file';

            const name = document.createElement('div');
            name.textContent = result.name;
            name.style.fontWeight = '500';
            div.appendChild(name);

            const preview = document.createElement('div');
            preview.textContent = result.preview;
            preview.style.fontSize = '0.8rem';
            preview.style.color = 'var(--text-secondary)';
            preview.style.marginTop = '0.25rem';
            div.appendChild(preview);

            div.addEventListener('click', () => loadFile(result.path));
            fileTreeEl.appendChild(div);
        });
    } catch (error) {
        console.error('Search failed:', error);
    }
}

// Edit functions
function startEditing() {
    if (!currentFile) return;

    isEditing = true;
    contentView.style.display = 'none';
    contentEditor.style.display = 'block';
    editBtn.style.display = 'none';
    saveBtn.style.display = 'inline-block';
    cancelBtn.style.display = 'inline-block';
    contentEditor.focus();
}

function stopEditing() {
    isEditing = false;
    contentView.style.display = 'block';
    contentEditor.style.display = 'none';
    editBtn.style.display = 'inline-block';
    saveBtn.style.display = 'none';
    cancelBtn.style.display = 'none';
}

async function saveFile() {
    if (!currentFile || !isEditing) return;

    const content = contentEditor.value;

    try {
        const res = await fetch(`${API_BASE}/file/${encodeURIComponent(currentFile.path)}`, {
            method: 'PUT',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ content })
        });

        const data = await res.json();

        if (data.success) {
            // Reload the file to show updated content
            await loadFile(currentFile.path);
        } else {
            alert('Failed to save: ' + (data.error || 'Unknown error'));
        }
    } catch (error) {
        console.error('Failed to save file:', error);
        alert('Failed to save file. Please try again.');
    }
}

// Keyboard shortcuts
document.addEventListener('keydown', (e) => {
    // Ctrl/Cmd + S to save
    if ((e.ctrlKey || e.metaKey) && e.key === 's') {
        e.preventDefault();
        if (isEditing) {
            saveFile();
        }
    }

    // Escape to cancel editing
    if (e.key === 'Escape' && isEditing) {
        stopEditing();
    }

    // Ctrl/Cmd + E to edit
    if ((e.ctrlKey || e.metaKey) && e.key === 'e' && !isEditing && currentFile) {
        e.preventDefault();
        startEditing();
    }
});