/**
 * 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. Determine headers
    if (sheet.getLastRow() === 0) {
      // Use provided headers if available
      if (data.headers && Array.isArray(data.headers)) {
        headers = data.headers;
      } else {
        // Fallback: Use keys but exclude internal control keys
        headers = Object.keys(data).filter(function(key) {
          return !["sheetName", "headers"].includes(key);
        });
      }
      sheet.appendRow(headers);
    } else {
      // Get existing headers from the first row
      var lastCol = sheet.getLastColumn();
      if (lastCol > 0) {
        headers = sheet.getRange(1, 1, 1, lastCol).getValues()[0];
      }
    }
    
    // 3. Map data to headers
    var row = headers.map(function(header) {
      var val = data[header];
      if (val === undefined || val === null) return "N/A";
      // If value is an object or array, stringify it to avoid [Ljava.lang.Object]
      if (typeof val === 'object') return JSON.stringify(val);
      return val;
    });
    
    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);
}