/**
 * BENDAHARA KELUARGA - BACKEND GOOGLE APPS SCRIPT
 * Timezone: Asia/Jakarta
 * Single Source of Truth: Google Sheets
 */

const TIMEZONE = "Asia/Jakarta";

/**
 * Setup Database Google Sheets
 */
function setupDatabase() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  // Sheet SETTINGS
  var sheetSettings = ss.getSheetByName("SETTINGS");
  if (!sheetSettings) {
    sheetSettings = ss.insertSheet("SETTINGS");
    sheetSettings.appendRow(["key", "value"]);
    sheetSettings.appendRow(["family_name", "Bendahara Keluarga"]);
    sheetSettings.appendRow(["currency", "IDR"]);
    sheetSettings.appendRow(["timezone", TIMEZONE]);
    sheetSettings.getRange("A1:B1").setFontWeight("bold").setBackground("#059669").setFontColor("#ffffff");
  }
  
  // Sheet INCOME
  var sheetIncome = ss.getSheetByName("INCOME");
  if (!sheetIncome) {
    sheetIncome = ss.insertSheet("INCOME");
    sheetIncome.appendRow(["income_id", "date", "month", "category", "description", "amount", "created_at", "updated_at"]);
    sheetIncome.getRange("A1:H1").setFontWeight("bold").setBackground("#059669").setFontColor("#ffffff");
  }
  
  // Sheet EXPENSES
  var sheetExpenses = ss.getSheetByName("EXPENSES");
  if (!sheetExpenses) {
    sheetExpenses = ss.insertSheet("EXPENSES");
    sheetExpenses.appendRow(["expense_id", "date", "month", "category", "description", "amount", "created_at", "updated_at"]);
    sheetExpenses.getRange("A1:H1").setFontWeight("bold").setBackground("#e11d48").setFontColor("#ffffff");
  }
}

/**
 * Seed Demo Data
 */
function seedDemoData() {
  setupDatabase();
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  var nowStr = Utilities.formatDate(new Date(), TIMEZONE, "yyyy-MM-dd");
  var monthStr = Utilities.formatDate(new Date(), TIMEZONE, "yyyy-MM");
  var isoNow = new Date().toISOString();

  var sheetInc = ss.getSheetByName("INCOME");
  if (sheetInc.getLastRow() <= 1) {
    sheetInc.appendRow(["INC-" + monthStr.replace("-","") + "-0001", nowStr, monthStr, "Gaji", "Gaji Bulanan Utama", 7000000, isoNow, isoNow]);
  }

  var sheetExp = ss.getSheetByName("EXPENSES");
  if (sheetExp.getLastRow() <= 1) {
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0001", nowStr, monthStr, "Sayur & Lauk", "Belanja Mingguan Pasar", 1250000, isoNow, isoNow]);
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0002", nowStr, monthStr, "Listrik", "Token PLN", 450000, isoNow, isoNow]);
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0003", nowStr, monthStr, "Air", "Tagihan PDAM", 150000, isoNow, isoNow]);
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0004", nowStr, monthStr, "Internet", "IndiHome", 300000, isoNow, isoNow]);
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0005", nowStr, monthStr, "Transportasi", "Bensin Motor & Mobil", 350000, isoNow, isoNow]);
    sheetExp.appendRow(["EXP-" + monthStr.replace("-","") + "-0006", nowStr, monthStr, "Pendidikan Anak 1", "SPP Sekolah", 500000, isoNow, isoNow]);
  }
}

function doGet(e) {
  return ContentService.createTextOutput("Bendahara Keluarga Backend Operational API.")
    .setMimeType(ContentService.MimeType.TEXT);
}

function doPost(e) {
  var lock = LockService.getScriptLock();
  lock.waitLock(10000);
  
  try {
    var data = JSON.parse(e.postData.contents);
    var action = data.action;
    var result = { status: "success" };
    
    if (action === "getDashboardData") {
      result.data = getDashboardDataLogic(data.month);
    } else if (action === "getIncome") {
      result.data = getIncomeLogic();
    } else if (action === "createIncome") {
      createIncomeLogic(data);
    } else if (action === "updateIncome") {
      updateIncomeLogic(data);
    } else if (action === "deleteIncome") {
      deleteIncomeLogic(data.income_id);
    } else if (action === "getExpenses") {
      result.data = getExpensesLogic();
    } else if (action === "createExpense") {
      createExpenseLogic(data);
    } else if (action === "updateExpense") {
      updateExpenseLogic(data);
    } else if (action === "deleteExpense") {
      deleteExpenseLogic(data.expense_id);
    } else if (action === "getMonthlyReport") {
      result.data = getMonthlyReportLogic(data.month);
    } else if (action === "getSettings") {
      result.data = getSettingsLogic();
    } else if (action === "updateSettings") {
      updateSettingsLogic(data);
    } else {
      throw new Error("Aksi tidak dikenal: " + action);
    }
    
    return ContentService.createTextOutput(JSON.stringify(result))
      .setMimeType(ContentService.MimeType.JSON);
      
  } catch (err) {
    return ContentService.createTextOutput(JSON.stringify({ status: "error", message: err.message }))
      .setMimeType(ContentService.MimeType.JSON);
  } finally {
    lock.releaseLock();
  }
}

function getDashboardDataLogic(month) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  var incSheet = ss.getSheetByName("INCOME");
  var incData = incSheet ? incSheet.getDataRange().getValues() : [];
  var totalInc = 0;
  var filteredInc = [];
  
  for (var i = 1; i < incData.length; i++) {
    var r = incData[i];
    var dStr = String(r[1]);
    var item = { income_id: r[0], date: dStr, month: r[2], category: r[3], description: r[4], amount: Number(r[5]), type: 'income' };
    if (!month || dStr.startsWith(month)) {
      totalInc += item.amount;
      filteredInc.push(item);
    }
  }
  
  var expSheet = ss.getSheetByName("EXPENSES");
  var expData = expSheet ? expSheet.getDataRange().getValues() : [];
  var totalExp = 0;
  var filteredExp = [];
  var maxExp = { category: "-", amount: 0 };
  
  for (var j = 1; j < expData.length; j++) {
    var row = expData[j];
    var dateStr = String(row[1]);
    var itm = { expense_id: row[0], date: dateStr, month: row[2], category: row[3], description: row[4], amount: Number(row[5]), type: 'expense' };
    if (!month || dateStr.startsWith(month)) {
      totalExp += itm.amount;
      filteredExp.push(itm);
      if (itm.amount > maxExp.amount) {
        maxExp = { category: itm.category, amount: itm.amount };
      }
    }
  }
  
  var combined = filteredInc.concat(filteredExp);
  combined.sort(function(a, b) { return new Date(b.date) - new Date(a.date); });
  
  return {
    month: month,
    total_income: totalInc,
    total_expense: totalExp,
    balance: totalInc - totalExp,
    max_expense_category: maxExp.category,
    max_expense_amount: maxExp.amount,
    recent_transactions: combined.slice(0, 5)
  };
}

function getIncomeLogic() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("INCOME");
  if (!sheet) return [];
  var rows = sheet.getDataRange().getValues();
  var res = [];
  for (var i = 1; i < rows.length; i++) {
    res.push({
      income_id: rows[i][0],
      date: String(rows[i][1]),
      month: String(rows[i][2]),
      category: rows[i][3],
      description: rows[i][4],
      amount: Number(rows[i][5])
    });
  }
  return res.reverse();
}

function createIncomeLogic(data) {
  var amt = Number(data.amount);
  if (!data.date || !data.category || isNaN(amt) || amt <= 0) {
    throw new Error("Data pemasukan tidak valid. Jumlah harus > 0.");
  }
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("INCOME");
  var month = data.date.slice(0, 7);
  var income_id = "INC-" + data.date.replace(/-/g, '') + "-" + Math.floor(1000 + Math.random() * 9000);
  var now = new Date().toISOString();
  sheet.appendRow([income_id, data.date, month, data.category, data.description || "", amt, now, now]);
}

function updateIncomeLogic(data) {
  var amt = Number(data.amount);
  if (!data.income_id || !data.date || !data.category || isNaN(amt) || amt <= 0) {
    throw new Error("Data edit pemasukan tidak valid.");
  }
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("INCOME");
  var rows = sheet.getDataRange().getValues();
  var month = data.date.slice(0, 7);
  for (var i = 1; i < rows.length; i++) {
    if (rows[i][0] === data.income_id) {
      var rowNum = i + 1;
      sheet.getRange(rowNum, 2).setValue(data.date);
      sheet.getRange(rowNum, 3).setValue(month);
      sheet.getRange(rowNum, 4).setValue(data.category);
      sheet.getRange(rowNum, 5).setValue(data.description || "");
      sheet.getRange(rowNum, 6).setValue(amt);
      sheet.getRange(rowNum, 8).setValue(new Date().toISOString());
      return;
    }
  }
  throw new Error("ID pemasukan tidak ditemukan.");
}

function deleteIncomeLogic(income_id) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("INCOME");
  var rows = sheet.getDataRange().getValues();
  for (var i = 1; i < rows.length; i++) {
    if (rows[i][0] === income_id) {
      sheet.deleteRow(i + 1);
      return;
    }
  }
  throw new Error("ID pemasukan tidak ditemukan.");
}

function getExpensesLogic() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("EXPENSES");
  if (!sheet) return [];
  var rows = sheet.getDataRange().getValues();
  var res = [];
  for (var i = 1; i < rows.length; i++) {
    res.push({
      expense_id: rows[i][0],
      date: String(rows[i][1]),
      month: String(rows[i][2]),
      category: rows[i][3],
      description: rows[i][4],
      amount: Number(rows[i][5])
    });
  }
  return res.reverse();
}

function createExpenseLogic(data) {
  var amt = Number(data.amount);
  if (!data.date || !data.category || isNaN(amt) || amt <= 0) {
    throw new Error("Data pengeluaran tidak valid. Jumlah harus > 0.");
  }
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("EXPENSES");
  var month = data.date.slice(0, 7);
  var expense_id = "EXP-" + data.date.replace(/-/g, '') + "-" + Math.floor(1000 + Math.random() * 9000);
  var now = new Date().toISOString();
  sheet.appendRow([expense_id, data.date, month, data.category, data.description || "", amt, now, now]);
}

function updateExpenseLogic(data) {
  var amt = Number(data.amount);
  if (!data.expense_id || !data.date || !data.category || isNaN(amt) || amt <= 0) {
    throw new Error("Data edit pengeluaran tidak valid.");
  }
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("EXPENSES");
  var rows = sheet.getDataRange().getValues();
  var month = data.date.slice(0, 7);
  for (var i = 1; i < rows.length; i++) {
    if (rows[i][0] === data.expense_id) {
      var rowNum = i + 1;
      sheet.getRange(rowNum, 2).setValue(data.date);
      sheet.getRange(rowNum, 3).setValue(month);
      sheet.getRange(rowNum, 4).setValue(data.category);
      sheet.getRange(rowNum, 5).setValue(data.description || "");
      sheet.getRange(rowNum, 6).setValue(amt);
      sheet.getRange(rowNum, 8).setValue(new Date().toISOString());
      return;
    }
  }
  throw new Error("ID pengeluaran tidak ditemukan.");
}

function deleteExpenseLogic(expense_id) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("EXPENSES");
  var rows = sheet.getDataRange().getValues();
  for (var i = 1; i < rows.length; i++) {
    if (rows[i][0] === expense_id) {
      sheet.deleteRow(i + 1);
      return;
    }
  }
  throw new Error("ID pengeluaran tidak ditemukan.");
}

function getMonthlyReportLogic(month) {
  var dash = getDashboardDataLogic(month);
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  
  var expSheet = ss.getSheetByName("EXPENSES");
  var expData = expSheet ? expSheet.getDataRange().getValues() : [];
  
  var expCategories = [
    "Sayur & Lauk", "Listrik", "Air", "Internet", "Transportasi",
    "Pendidikan Anak 1", "Pendidikan Anak 2", "Pendidikan Anak 3", "Pendidikan Anak 4", "Pendidikan Anak 5",
    "Pendidikan Anak 6", "Pendidikan Anak 7", "Kesehatan", "Belanja", "Cicilan",
    "Hiburan", "Nyumbang", "Investasi", "Arisan", "Lainnya"
  ];
  
  var expCatMap = {};
  expCategories.forEach(function(c) { expCatMap[c] = 0; });
  
  for (var i = 1; i < expData.length; i++) {
    var dStr = String(expData[i][1]);
    var cat = expData[i][3];
    var amt = Number(expData[i][5]);
    if (!month || dStr.startsWith(month)) {
      expCatMap[cat] = (expCatMap[cat] || 0) + amt;
    }
  }
  
  var incSheet = ss.getSheetByName("INCOME");
  var incData = incSheet ? incSheet.getDataRange().getValues() : [];
  var incCategories = ["Gaji", "Usaha", "Bonus", "Pendapatan Lainnya", "Lainnya"];
  
  var incCatMap = {};
  incCategories.forEach(function(c) { incCatMap[c] = 0; });
  
  for (var j = 1; j < incData.length; j++) {
    var dateStr = String(incData[j][1]);
    var src = incData[j][3];
    var amount = Number(incData[j][5]);
    if (!month || dateStr.startsWith(month)) {
      incCatMap[src] = (incCatMap[src] || 0) + amount;
    }
  }
  
  dash.expenses_by_category = expCatMap;
  dash.income_by_category = incCatMap;
  return dash;
}

function getSettingsLogic() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("SETTINGS");
  if (!sheet) return { family_name: "Bendahara Keluarga", currency: "IDR", timezone: TIMEZONE };
  var rows = sheet.getDataRange().getValues();
  var res = {};
  for (var i = 1; i < rows.length; i++) {
    res[rows[i][0]] = rows[i][1];
  }
  return res;
}

function updateSettingsLogic(data) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName("SETTINGS");
  if (!sheet) return;
  var rows = sheet.getDataRange().getValues();
  if (data.family_name) {
    for (var i = 1; i < rows.length; i++) {
      if (rows[i][0] === "family_name") {
        sheet.getRange(i + 1, 2).setValue(data.family_name);
        return;
      }
    }
  }
}