// Generate Google Apps Script
function generateScript(columns) {
    return `
function doGet(e) {
  try {
    const action = e.parameter.action;
    const sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();

    switch (action) {
      case 'search':
        return handleSearchGet(sheet, e.parameter.q);
      case 'fetch':
        const startRow = e.parameter.startRow ? parseInt(e.parameter.startRow) : null;
        const endRow = e.parameter.endRow ? parseInt(e.parameter.endRow) : null;
        return handleFetchGet(sheet, startRow, endRow);
      default:
        return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid action.' })).setMimeType(ContentService.MimeType.JSON);
    }
  } catch (error) {
    Logger.log(error);
    return ContentService.createTextOutput(JSON.stringify({ error: error.message })).setMimeType(ContentService.MimeType.JSON);
  }
}

function doPost(e) {
  try {
    if (e.postData.type !== 'application/json') {
      return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid content type. Only JSON is accepted.' })).setMimeType(ContentService.MimeType.JSON);
    }

    const data = JSON.parse(e.postData.contents);
    const action = data.action;
    const sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();

    switch (action) {
      case 'append':
        return handleAppend(sheet, data.rows);
      case 'search':
        return handleSearch(sheet, data.q);
      case 'update':
        return handleUpdate(sheet, data.row, ${columns.map(col => `data.${col}`).join(', ')});
      case 'delete':
        return handleDelete(sheet, data.row);
      case 'fetch':
        return handleFetch(sheet, data.row, data.endRow);
      default:
        return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid action.' })).setMimeType(ContentService.MimeType.JSON);
    }
  } catch (error) {
    Logger.log(error);
    return ContentService.createTextOutput(JSON.stringify({ error: error.message })).setMimeType(ContentService.MimeType.JSON);
  }
}

function handleAppend(sheet, rows) {
  if (!Array.isArray(rows) || rows.length === 0) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid rows data.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const values = rows.map(row => [${columns.map(col => `row.${col}`).join(', ')}]);
  sheet.getRange(sheet.getLastRow() + 1, 1, values.length, values[0].length).setValues(values);

  return ContentService.createTextOutput(JSON.stringify({ success: true, rowsAdded: rows.length })).setMimeType(ContentService.MimeType.JSON);
}

function handleSearch(sheet, query) {
  if (!query) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Search query is required.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const data = sheet.getDataRange().getValues();
  const results = data.filter(row => ${columns.map((col, i) => `row[${i}].toLowerCase().includes(query.toLowerCase())`).join(' || ')});

  return ContentService.createTextOutput(JSON.stringify(results)).setMimeType(ContentService.MimeType.JSON);
}

function handleSearchGet(sheet, query) {
  if (!query) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Search query is required.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const data = sheet.getDataRange().getValues();
  const results = data.filter(row => ${columns.map((col, i) => `row[${i}].toLowerCase().includes(query.toLowerCase())`).join(' || ')});

  return ContentService.createTextOutput(JSON.stringify(results)).setMimeType(ContentService.MimeType.JSON);
}

function handleUpdate(sheet, rowIndex, ${columns.join(', ')}) {
  if (!rowIndex || ${columns.map(col => `!${col}`).join(' || ')}) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid update data.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const row = rowIndex + 1;
  if (row > sheet.getLastRow()) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Row index out of range.' })).setMimeType(ContentService.MimeType.JSON);
  }

${columns.map((col, i) => `  sheet.getRange(row, ${i + 1}).setValue(${col});`).join('\n')}

  return ContentService.createTextOutput(JSON.stringify({ success: true })).setMimeType(ContentService.MimeType.JSON);
}

function handleDelete(sheet, rowIndex) {
  if (!rowIndex) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Row index is required.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const row = rowIndex + 1;
  if (row > sheet.getLastRow()) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Row index out of range.' })).setMimeType(ContentService.MimeType.JSON);
  }

  sheet.deleteRow(row);
  return ContentService.createTextOutput(JSON.stringify({ success: true })).setMimeType(ContentService.MimeType.JSON);
}

function handleFetch(sheet, startRow, endRow) {
  const lastRow = sheet.getLastRow();
  startRow = startRow ? startRow + 1 : 1;
  endRow = endRow ? endRow + 1 : lastRow;

  if (startRow > lastRow || endRow > lastRow || startRow > endRow) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid row range.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const data = sheet.getRange(startRow, 1, endRow - startRow + 1, ${columns.length}).getValues();
  return ContentService.createTextOutput(JSON.stringify(data)).setMimeType(ContentService.MimeType.JSON);
}

function handleFetchGet(sheet, startRow, endRow) {
  const lastRow = sheet.getLastRow();
  startRow = startRow ? startRow + 1 : 1;
  endRow = endRow ? endRow + 1 : lastRow;

  if (startRow > lastRow || endRow > lastRow || startRow > endRow) {
    return ContentService.createTextOutput(JSON.stringify({ error: 'Invalid row range.' })).setMimeType(ContentService.MimeType.JSON);
  }

  const data = sheet.getRange(startRow, 1, endRow - startRow + 1, ${columns.length}).getValues();
  return ContentService.createTextOutput(JSON.stringify(data)).setMimeType(ContentService.MimeType.JSON);
}`.trim();
}

// Generate cURL examples as an object
function generateCurlExamples(columns) {
    const sampleValues = columns.map((col, i) => [col, `Sample ${col} ${i + 1}`]);
    return {
        appendSingle: `
curl -X POST "https://script.google.com/macros/s/YOUR_SCRIPT_ID/exec" \\
-H "Content-Type: application/json" \\
-d '{
  "action": "append",
  "rows": [{
    ${sampleValues.map(([col, val]) => `"${col}": "${val}"`).join(',\n    ')}
  }]
}'`.trim(),
        appendMultiple: `
curl -X POST "https://script.google.com/macros/s/YOUR_SCRIPT_ID/exec" \\
-H "Content-Type: application/json" \\
-d '{
  "action": "append",
  "rows": [
    { ${sampleValues.map(([col, val]) => `"${col}": "${val}"`).join(', ')} },
    { ${sampleValues.map(([col, val]) => `"${col}": "Another ${val}"`).join(', ')} }
  ]
}'`.trim(),
        fetchAll: `
curl "https://script.google.com/macros/s/YOUR_WEB_APP_ID/exec?action=fetch"`.trim(),
        fetchRange: `
curl "https://script.google.com/macros/s/YOUR_WEB_APP_ID/exec?action=fetch&startRow=50&endRow=100"`.trim(),
        search: `
curl "https://script.google.com/macros/s/YOUR_WEB_APP_ID/exec?action=search&q=sample"`.trim(),
        update: `
curl -X POST "https://script.google.com/macros/s/YOUR_SCRIPT_ID/exec" \\
-H "Content-Type: application/json" \\
-d '{
  "action": "update",
  "row": 50,
  ${sampleValues.map(([col, val]) => `"${col}": "Updated ${val}"`).join(',\n  ')}
}'`.trim(),
        delete: `
curl -X POST "https://script.google.com/macros/s/YOUR_SCRIPT_ID/exec" \\
-H "Content-Type: application/json" \\
-d '{
  "action": "delete",
  "row": 100
}'`.trim()
    };
}

// Update previews
function updatePreviews() {
    const columns = Array.from(document.querySelectorAll('.column-input'))
        .map(input => input.value.trim())
        .filter(value => value !== '');
    document.getElementById('codePreview').textContent = generateScript(columns);
    const curlExamples = generateCurlExamples(columns);
    const activeButton = document.querySelector('.curl-button.active');
    const exampleKey = activeButton ? activeButton.getAttribute('onclick').match(/'([^']+)'/)[1] : 'appendSingle';
    document.getElementById('curlExamples').textContent = curlExamples[exampleKey];
}

// Add new column
function addColumn() {
    const container = document.getElementById('columnInputs');
    const div = document.createElement('div');
    div.innerHTML = `
 <div class="flex space-x-3 sm:space-x-3">
                    <input type="text" class="column-input input-field flex-1 px-3 sm:px-4 py-2 rounded-lg" placeholder="Column name (e.g., Category)" value="meaning">
                    <button onclick="removeColumn(this)" class="delete-btn btn bg-red-600 text-white p-2 rounded-lg">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
                        </svg>
                    </button>
                </div> `;
    container.appendChild(div);
    updatePreviews();
}

// Remove column
function removeColumn(button) {
    button.parentElement.parentElement.remove();
    updatePreviews();
}

// Tab switching
function showTab(tabId) {
    document.querySelectorAll('.tab-content').forEach(tab => tab.classList.remove('active'));
    document.getElementById(tabId).classList.add('active');
    document.querySelectorAll('.tab-button').forEach(btn => btn.classList.remove('border-blue-500'));
    event.target.classList.add('border-blue-500');
}

// Show specific cURL example
function showCurlExample(exampleKey) {
    const columns = Array.from(document.querySelectorAll('.column-input'))
        .map(input => input.value.trim())
        .filter(value => value !== '');
    const curlExamples = generateCurlExamples(columns);
    document.getElementById('curlExamples').textContent = curlExamples[exampleKey];
    document.querySelectorAll('.curl-button').forEach(btn => btn.classList.remove('active'));
    event.target.classList.add('active');
}

// Copy code to clipboard
function copyCode() {
    const code = document.getElementById('codePreview').textContent;
    if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(code).then(() => {
            alert('Code copied to clipboard!');
        }).catch(err => {
            console.error('Failed to copy: ', err);
            fallbackCopy(code);
        });
    } else {
        fallbackCopy(code);
    }
}

// Fallback for older browsers or restricted environments
function fallbackCopy(text) {
    const textArea = document.createElement('textarea');
    textArea.value = text;
    document.body.appendChild(textArea);
    textArea.select();
    try {
        document.execCommand('copy');
        alert('Code copied to clipboard!');
    } catch (err) {
        alert('Failed to copy code. Please copy it manually.');
    }
    document.body.removeChild(textArea);
}

// Initialize
document.addEventListener('DOMContentLoaded', () => {
    updatePreviews();
    document.getElementById('columnInputs').addEventListener('input', updatePreviews);
    // Set default active cURL button
    const firstCurlButton = document.querySelector('.curl-button');
    if (firstCurlButton) {
        firstCurlButton.classList.add('active');
    }
});