'use strict';

// Connect to existing DB from script.js
const DB_NAME = 'PDFWizardDB';
const STORE = 'docs';
let db;

// Field mapping (matches preview fields)
const fieldMap = {
    '1': 'field-1',  // Name
    '2': 'field-2',  // Position
    '3': 'field-3',  // Department
    '4': 'field-4',  // Photo URL
    '5': 'field-5',  // Start Date
    '6': 'field-6',  // End Date
    '7': 'field-7',  // Company
    '8': 'field-8',  // City
    '9': 'field-9',  // Postal Code
    '10': 'field-10', // Country
    '11': 'field-11', // Reference No.
    '12': 'field-12'  // Document No.
};

document.addEventListener('DOMContentLoaded', async () => {
    try {
        await initDB();
        setupEventListeners();
        loadRecords();
    } catch (e) {
        console.error('Dashboard init error:', e);
    }
});

function initDB() {
    return new Promise((resolve, reject) => {
        const req = indexedDB.open(DB_NAME, 1);
        req.onupgradeneeded = (e) => {
            const db = e.target.result;
            if (!db.objectStoreNames.contains(STORE)) {
                db.createObjectStore(STORE, { keyPath: 'id' });
            }
        };
        req.onsuccess = () => { 
            db = req.result; 
            resolve(); 
        };
        req.onerror = () => reject(req.error);
    });
}

function setupEventListeners() {
    // Add Record Button
    document.getElementById('btn-add-record').addEventListener('click', () => {
        document.getElementById('record-form').reset();
        document.getElementById('record-id').value = '';
        document.getElementById('modal-title').textContent = 'Add New Record';
        document.getElementById('record-modal').classList.remove('hidden');
    });

    // Modal Buttons
    document.getElementById('btn-cancel').addEventListener('click', () => {
        document.getElementById('record-modal').classList.add('hidden');
    });

    document.getElementById('btn-save').addEventListener('click', saveRecord);

    // Close Modal
    document.querySelectorAll('.close-modal').forEach(btn => {
        btn.addEventListener('click', () => {
            document.getElementById('record-modal').classList.add('hidden');
        });
    });
}

async function loadRecords() {
    try {
        const records = await getAllRecords();
        renderRecords(records);
    } catch (e) {
        console.error('Error loading records:', e);
    }
}

function getAllRecords() {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(STORE, 'readonly');
        const store = tx.objectStore(STORE);
        const req = store.getAll();
        req.onsuccess = () => resolve(req.result || []);
        req.onerror = () => reject(req.error);
    });
}

function renderRecords(records) {
    const tbody = document.getElementById('data-table-body');
    tbody.innerHTML = '';

    if (records.length === 0) {
        tbody.innerHTML = `
            <tr>
                <td colspan="5" class="px-6 py-4 text-center text-slate-500">
                    No records found. Click "Add Record" to create one.
                </td>
            </tr>
        `;
        return;
    }

    records.forEach(record => {
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-50 dark:hover:bg-slate-700/50';
        tr.innerHTML = `
            <td class="px-6 py-4 whitespace-nowrap text-sm font-medium text-slate-900 dark:text-slate-200">
                ${record.id.substring(0, 6)}
            </td>
            <td class="px-6 py-4 whitespace-nowrap text-sm text-slate-500 dark:text-slate-400">
                ${record.data['1'] || 'N/A'}
            </td>
            <td class="px-6 py-4 whitespace-nowrap text-sm text-slate-500 dark:text-slate-400">
                ${record.data['2'] || 'N/A'}
            </td>
            <td class="px-6 py-4 whitespace-nowrap text-sm text-slate-500 dark:text-slate-400">
                ${record.data['7'] || 'N/A'}
            </td>
            <td class="px-6 py-4 whitespace-nowrap text-right text-sm font-medium">
                <button class="btn-edit text-blue-600 hover:text-blue-900 dark:text-blue-400 dark:hover:text-blue-300 mr-3" data-id="${record.id}">
                    <i data-feather="edit-2" class="w-4 h-4"></i>
                </button>
                <button class="btn-delete text-red-600 hover:text-red-900 dark:text-red-400 dark:hover:text-red-300" data-id="${record.id}">
                    <i data-feather="trash-2" class="w-4 h-4"></i>
                </button>
            </td>
        `;
        tbody.appendChild(tr);
    });

    // Add event listeners to action buttons
    document.querySelectorAll('.btn-edit').forEach(btn => {
        btn.addEventListener('click', (e) => editRecord(e.target.closest('button').dataset.id));
    });

    document.querySelectorAll('.btn-delete').forEach(btn => {
        btn.addEventListener('click', (e) => deleteRecord(e.target.closest('button').dataset.id));
    });

    feather.replace();
}

async function editRecord(id) {
    try {
        const record = await getRecord(id);
        if (!record) return;

        document.getElementById('modal-title').textContent = 'Edit Record';
        document.getElementById('record-id').value = record.id;

        // Populate form fields
        Object.keys(fieldMap).forEach(key => {
            const fieldId = fieldMap[key];
            const field = document.getElementById(fieldId);
            if (field) field.value = record.data[key] || '';
        });

        document.getElementById('record-modal').classList.remove('hidden');
    } catch (e) {
        console.error('Error editing record:', e);
    }
}

function getRecord(id) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(STORE, 'readonly');
        const store = tx.objectStore(STORE);
        const req = store.get(id);
        req.onsuccess = () => resolve(req.result);
        req.onerror = () => reject(req.error);
    });
}

async function saveRecord() {
    const form = document.getElementById('record-form');
    if (!form.checkValidity()) {
        form.reportValidity();
        return;
    }

    const id = document.getElementById('record-id').value || Date.now().toString();
    const record = {
        id,
        date: new Date().toISOString(),
        data: {}
    };

    // Collect data from form
    Object.keys(fieldMap).forEach(key => {
        const fieldId = fieldMap[key];
        const field = document.getElementById(fieldId);
        if (field) record.data[key] = field.value;
    });

    try {
        await saveRecordToDB(record);
        document.getElementById('record-modal').classList.add('hidden');
        loadRecords();
        
        // Update preview if on main page
        if (window.opener) {
            window.opener.postMessage({ type: 'DATA_UPDATED', data: record.data }, '*');
        }
    } catch (e) {
        console.error('Error saving record:', e);
    }
}

function saveRecordToDB(record) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(STORE, 'readwrite');
        const store = tx.objectStore(STORE);
        const req = store.put(record);
        req.onsuccess = () => resolve();
        req.onerror = () => reject(req.error);
    });
}

async function deleteRecord(id) {
    if (!confirm('Are you sure you want to delete this record?')) return;
    
    try {
        await deleteRecordFromDB(id);
        loadRecords();
    } catch (e) {
        console.error('Error deleting record:', e);
    }
}

function deleteRecordFromDB(id) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(STORE, 'readwrite');
        const store = tx.objectStore(STORE);
        const req = store.delete(id);
        req.onsuccess = () => resolve();
        req.onerror = () => reject(req.error);
    });
}