/**
 * Google Apps Script to handle POST requests from the Chrome Extension
 * 1. Create a new Google Sheet.
 * 2. Extensions > Apps Script.
 * 3. Paste this code.
 * 4. Deploy > New Deployment > Web App.
 * 5. Set 'Execute as: Me' and 'Who has access: Anyone'.
 * 6. Copy the Web App URL and paste it into the Extension.
 */

function doPost(e) {
  try {
    var data = JSON.parse(e.postData.contents);
    var ss = SpreadsheetApp.getActiveSpreadsheet();
    var sheet;

    // 1. Get or Create the target sheet
    if (data.sheetName) {
      sheet = ss.getSheetByName(data.sheetName);
      if (!sheet) {
        sheet = ss.insertSheet(data.sheetName);
      }
    } else {
      sheet = ss.getActiveSheet();
    }
    
    var headers = [];
    
    // 2. If sheet is brand new (no rows), create headers first
    if (sheet.getLastRow() === 0) {
      // Extract keys from data, excluding 'sheetName' which is a control parameter
      headers = Object.keys(data).filter(function(key) {
        return key !== "sheetName";
      });
      sheet.appendRow(headers);
    } else {
      // 3. If sheet already exists, get existing headers from the first row
      var lastCol = sheet.getLastColumn();
      if (lastCol > 0) {
        headers = sheet.getRange(1, 1, 1, lastCol).getValues()[0];
      } else {
        // Fallback for edge cases where lastRow > 0 but lastCol is 0
        headers = Object.keys(data).filter(function(key) {
          return key !== "sheetName";
        });
        sheet.appendRow(headers);
      }
    }
    
    // 4. Map data to the determined headers
    var row = headers.map(function(header) {
      // data[header] might be undefined for some rows if schema changes
      return data[header] !== undefined ? data[header] : "N/A";
    });
    
    sheet.appendRow(row);
    
    return ContentService.createTextOutput(JSON.stringify({ status: "success", sheet: sheet.getName() }))
      .setMimeType(ContentService.MimeType.JSON);
      
  } catch (error) {
    return ContentService.createTextOutput(JSON.stringify({ status: "error", message: error.toString() }))
      .setMimeType(ContentService.MimeType.JSON);
  }
}

function doOptions(e) {
  return ContentService.createTextOutput("")
    .setMimeType(ContentService.MimeType.TEXT);
}