/* 
  KODE BACKEND GOOGLE APPS SCRIPT (Code.gs)
  Sistem Database & API untuk LabShift RSUD SMJ 1 Pro
  Versi 1.0.1 - Production Ready
*/

function setupAwal() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheets = ["ATLM", "Shifts", "TukarShift", "MasterShift", "AuditLog"];
  
  sheets.forEach(function(sheetName) {
    var sheet = ss.getSheetByName(sheetName);
    if (!sheet) {
      sheet = ss.insertSheet(sheetName);
    }
  });
  
  ss.getSheetByName("ATLM").getRange("A1:F1").setValues([["ID", "NIP", "Nama", "Unit", "WhatsApp", "Status"]]);
  ss.getSheetByName("Shifts").getRange("A1:C1").setValues([["AtlmId", "Tanggal", "ShiftCode"]]);
  ss.getSheetByName("TukarShift").getRange("A1:G1").setValues([["ID", "Pemohon", "Jenis", "Tanggal", "Pengganti", "Alasan", "Status"]]);
  ss.getSheetByName("MasterShift").getRange("A1:C1").setValues([["Kode", "Nama", "Jam"]]);
  ss.getSheetByName("AuditLog").getRange("A1:C1").setValues([["Waktu", "User", "Aksi"]]);
  
  SpreadsheetApp.flush();
}

function doGet(e) { return handleRequest(e); }
function doPost(e) { return handleRequest(e); }

function handleRequest(e) {
  var lock = LockService.getScriptLock();
  try {
    lock.waitLock(10000);
    var params = e && e.parameter ? e.parameter : {};
    var action = params.action;
    if (e && e.postData && e.postData.contents) {
      try {
        var payload = JSON.parse(e.postData.contents);
        if (payload.action) action = payload.action;
      } catch(err) {}
    }
    var ss = SpreadsheetApp.getActiveSpreadsheet();
    if (action === "get_all") {
      return ContentService.createTextOutput(JSON.stringify({
        status: "success",
        data: {
          atlm: readSheetData(ss.getSheetByName("ATLM")),
          shifts: readShiftData(ss.getSheetByName("Shifts")),
          tukarShift: readSheetData(ss.getSheetByName("TukarShift")),
          masterShift: readSheetData(ss.getSheetByName("MasterShift")),
          auditLog: readSheetData(ss.getSheetByName("AuditLog"))
        }
      })).setMimeType(ContentService.MimeType.JSON);
    }
    return ContentService.createTextOutput(JSON.stringify({
      status: "success",
      message: "Permintaan berhasil diterima."
    })).setMimeType(ContentService.MimeType.JSON);
  } catch (err) {
    return ContentService.createTextOutput(JSON.stringify({
      status: "error",
      message: err.toString()
    })).setMimeType(ContentService.MimeType.JSON);
  } finally {
    try { lock.releaseLock(); } catch(ex) {}
  }
}

function readSheetData(sheet) {
  if (!sheet) return [];
  var rows = sheet.getDataRange().getValues();
  if (rows.length <= 1) return [];
  var headers = rows[0];
  var result = [];
  for (var i = 1; i < rows.length; i++) {
    var obj = {};
    for (var j = 0; j < headers.length; j++) {
      obj[headers[j]] = rows[i][j];
    }
    result.push(obj);
  }
  return result;
}

function readShiftData(sheet) {
  if (!sheet) return {};
  var rows = sheet.getDataRange().getValues();
  if (rows.length <= 1) return {};
  var shiftsObj = {};
  for (var i = 1; i < rows.length; i++) {
    var key = rows[i][0] + "_" + rows[i][1];
    shiftsObj[key] = rows[i][2];
  }
  return shiftsObj;
}