trip-split/AppsScript.gs at main · kothariji/trip-split · GitHub

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/**

* ============================================================

* TRIP SPLIT — Google Apps Script backend

* ============================================================

* This file is also embedded in index.html (between the gs:embed markers) so

* the web app's setup screen can hand it to someone with no repo access.

* CHANGE ONE, RE-EMBED THE OTHER.

* FIRST-TIME SETUP

* 1. Paste this whole file into Extensions > Apps Script

* 2. In the editor, select the function `setupSheets` and click Run.

* (Grant permissions when asked. This creates/repairs all 4 tabs.)

* 3. Deploy > New deployment > Web app

* Execute as: Me

* Who has access: Anyone

* 4. Copy the /exec URL into index.html (SCRIPT_URL)

* Data model

* ----------

* Trip : field | value (name, description, startDate, endDate)

* People : name | active

* Tags : tag | emoji

* date = YYYY-MM-DD, the day the money moved. This is what the ledger and

* every chart group by. Set by whoever records the entry.

* timestamp = when the row was written. Never edited, used only to order two

* entries inside the same day.

* splitMode = 'equal' -> splitBetween is "ALL" or "Asha,Dhruv,Sakshi"

* splitMode = 'custom' -> splitBetween is "Asha:400,Dhruv:1100"

* People and Tags are optional seed lists only. The lists the web app shows

* are derived from the sheet data itself: anyone who appears as a payer, in a

* split, or in a settlement is a person, and any tag used on an expense is a

* category. A missing or differently-labelled tab is not an error.

* All balance math lives in the client. This script is a data layer only.

* ============================================================

const SHEETS = {

trip: {

headers: ['field', 'value']

people: {

headers: ['name', 'active']

tags: {

headers: ['tag', 'emoji']

expenses: {

headers: ['id', 'paidBy', 'description', 'amount', 'tag', 'splitBetween', 'splitMode', 'timestamp', 'date']

settlements: {

headers: ['id', 'fromPerson', 'toPerson', 'amount', 'note', 'timestamp', 'date']

}

};

// Key/value rather than columns, so a new detail later costs one row.

const TRIP_FIELDS = ['name', 'description', 'startDate', 'endDate'];

const DEFAULT_TAGS = [

['stay', '🏨'],

['food', '🍽️'],

['travel', '🚕'],

['activities', '🎟️'],

['gifts', '🎁'],

['misc', '📦']

];

/* ============================================================

SETUP — run this once, manually, from the editor

============================================================ */

function setupSheets() {

const ss = SpreadsheetApp.getActiveSpreadsheet();

const report = [];

Object.keys(SHEETS).forEach(function (key) {

const cfg = SHEETS[key];

let sheet = ss.getSheetByName(cfg.name);

// ponytail: never rename or replace a tab that has data in it. Reads match

// columns by the tab's own header row, so an odd layout is fine as-is.

if (sheet) {

if (sheet.getLastRow() === 0) {

sheet.getRange(1, 1, 1, cfg.headers.length).setValues([cfg.headers]);

report.push(cfg.name + ': headers written into empty tab');

return;

}

const added = addMissingHeaders(sheet, cfg);

report.push(cfg.name + ': kept ' + (sheet.getLastRow() - 1) + ' data rows' +

(added.length ? ', added column' + (added.length > 1 ? 's ' : ' ') + added.join(', ') : ''));

return;

}

sheet = ss.insertSheet(cfg.name);

sheet.getRange(1, 1, 1, cfg.headers.length).setValues([cfg.headers]);

sheet.getRange(1, 1, 1, cfg.headers.length)

.setFontWeight('bold')

.setBackground('#e8eef0');

sheet.setFrozenRows(1);

sheet.autoResizeColumns(1, cfg.headers.length);

report.push(cfg.name + ': created');

});

/** Appends any header this script expects but the tab does not have yet. */

function addMissingHeaders(sheet, cfg) {

const lastCol = Math.max(sheet.getLastColumn(), 1);

const existing = sheet.getRange(1, 1, 1, lastCol).getValues()[0].map(normHeader);

const missing = cfg.headers.filter(function (h) { return existing.indexOf(normHeader(h)) === -1; });

missing.forEach(function (h, i) {

const col = lastCol + 1 + i;

sheet.getRange(1, col).setValue(h)

.setFontWeight('bold')

.setBackground('#e8eef0');

});

return missing;

}

/** Fills a blank date cell from the row's own timestamp. Only touches blanks. */

function backfillDates(cfg) {

const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(cfg.name);

if (!sheet || sheet.getLastRow() < 2) return 0;

const map = headerMap(sheet, cfg).map;

const dateCol = map.date, tsCol = map.timestamp;

const rows = sheet.getLastRow() - 1;

const dates = sheet.getRange(2, dateCol, rows, 1).getValues();

const stamps = sheet.getRange(2, tsCol, rows, 1).getValues();

let filled = 0;

for (let i = 0; i < rows; i++) {

if (toDateStr(dates[i][0])) continue;

const from = toDateStr(stamps[i][0]);

if (!from) continue;

dates[i][0] = from;

filled++;

}

if (filled) sheet.getRange(2, dateCol, rows, 1).setValues(dates);

return filled;

}

// Seed default tags if the Tags tab is empty

const tagSheet = ss.getSheetByName(SHEETS.tags.name);

if (tagSheet.getLastRow() < 2) {

tagSheet.getRange(2, 1, DEFAULT_TAGS.length, 2).setValues(DEFAULT_TAGS);

report.push('Tags: seeded ' + DEFAULT_TAGS.length + ' default tags');

}

// Lay out the trip detail rows so the tab explains itself in the sheet

const tripSheet = ss.getSheetByName(SHEETS.trip.name);

if (tripSheet && tripSheet.getLastRow() < 2) {

tripSheet.getRange(2, 1, TRIP_FIELDS.length, 2).setValues(

TRIP_FIELDS.map(function (f) { return [f, '']; })

);

report.push('Trip: added the detail rows — name it from the web app');

}

// Give older rows a date so the sheet sorts and filters like the app reads it

[SHEETS.expenses, SHEETS.settlements].forEach(function (cfg) {

const filled = backfillDates(cfg);

if (filled) report.push(cfg.name + ': filled in ' + filled + ' blank date' + (filled > 1 ? 's' : '') + ' from the timestamps');

});

// Nudge if there are no people yet

const peopleSheet = ss.getSheetByName(SHEETS.people.name);

if (peopleSheet.getLastRow() < 2) {

report.push('People: empty — names are also picked up from the expense rows themselves');

const backups = ss.getSheets()

.map(function (sh) { return sh.getName(); })

.filter(function (n) { return n.indexOf(SHEETS.people.name + '_backup_') === 0; });

if (backups.length) {

report.push('People: an earlier setup run moved your names to ' + backups.join(', ') +

' — copy them back into the People tab');

}

Logger.log(report.join('\n'));

try {

SpreadsheetApp.getUi().alert('Trip Split setup\n\n' + report.join('\n'));

} catch (e) {

// No UI context — the log is enough.

}

/* ============================================================

READ

============================================================ */

function doGet() {

try {

const expenses = readExpenses();

const settlements = readSettlements();

return jsonOutput({

ok: true,

trip: readTrip(),

people: derivePeople(expenses, settlements, readPeople()),

tags: deriveTags(expenses, readTags()),

expenses: expenses,

settlements: settlements,

serverTime: new Date().toISOString()

});

} catch (err) {

return jsonOutput({ ok: false, error: err.message });

}

/**

* The People tab is a seed, not the source of truth: everyone who shows up as

* a payer, inside a split, or in a settlement is part of the trip. First

* spelling of a name wins; comparison is case-insensitive.

function derivePeople(expenses, settlements, seedNames) {

const seen = {};

const order = [];

const add = function (raw) {

const name = String(raw == null ? '' : raw).trim();

if (!name || name.toUpperCase() === 'ALL') return;

const key = name.toLowerCase();

if (seen[key]) return;

seen[key] = true;

order.push(name);

};

(seedNames || []).forEach(add);

(expenses || []).forEach(function (e) {

add(e.paidBy);

splitNames(e).forEach(add);

});

(settlements || []).forEach(function (s) {

add(s.fromPerson);

add(s.toPerson);

});

return order;

}

/** Names in splitBetween, for both "A,B" and "A:400,B:600" shapes. */

function splitNames(e) {

return String(e && e.splitBetween || '')

.split(',')

.map(function (part) { return String(part).split(':')[0].trim(); })

.filter(Boolean);

}

/** Tags tab plus any tag actually used on an expense. */

function deriveTags(expenses, seedTags) {

const seen = {};

const out = [];

(seedTags || []).forEach(function (t) {

const key = String(t.tag || '').trim().toLowerCase();

if (!key || seen[key]) return;

seen[key] = true;

out.push({ tag: String(t.tag).trim(), emoji: String(t.emoji || '').trim() });

});

(expenses || []).forEach(function (e) {

const tag = String(e.tag || '').trim();

const key = tag.toLowerCase();

if (!tag || seen[key]) return;

seen[key] = true;

out.push({ tag: tag, emoji: '' });

});

return out;

}

const INACTIVE = ['false', 'no', 'n', '0', 'inactive', 'left'];

const HEADERISH = ['name', 'names', 'person', 'people', 'member'];

function readTrip() {

const out = { name: '', description: '', startDate: '', endDate: '' };

readRows(SHEETS.trip).forEach(function (r) {

const key = String(r.field == null ? '' : r.field).trim().toLowerCase();

const field = TRIP_FIELDS.filter(function (f) { return f.toLowerCase() === key; })[0];

if (!field) return;

out[field] = field.indexOf('Date') !== -1

? toDateStr(r.value)

: String(r.value == null ? '' : r.value).trim();

});

return out;

}

function readPeople() {

return readRows(SHEETS.people)

.filter(function (r) {

const name = String(r.name == null ? '' : r.name).trim().toLowerCase();

return name !== '' && HEADERISH.indexOf(name) === -1;

})

// Blank, TRUE, "yes", a checkbox, a stray note — all mean active. Only an

// explicit off-value drops someone from the pickers.

.filter(function (r) {

return INACTIVE.indexOf(String(r.active == null ? '' : r.active).trim().toLowerCase()) === -1;

})

.map(function (r) { return String(r.name).trim(); });

}

function readTags() {

return readRows(SHEETS.tags)

.filter(function (r) { return String(r.tag).trim() !== ''; })

.map(function (r) {

return { tag: String(r.tag).trim(), emoji: String(r.emoji || '').trim() };

});

}

function readExpenses() {

return readRows(SHEETS.expenses)

.filter(function (r) { return String(r.id).trim() !== ''; })

.map(function (r) {

return {

id: String(r.id),

paidBy: String(r.paidBy || '').trim(),

description: String(r.description || ''),

amount: Number(r.amount) || 0,

tag: String(r.tag || '').trim(),

splitBetween: String(r.splitBetween || 'ALL').trim(),

splitMode: String(r.splitMode || 'equal').trim().toLowerCase(),

timestamp: toIso(r.timestamp),

date: toDateStr(r.date) || toDateStr(r.timestamp)

};

});

}

function readSettlements() {

return readRows(SHEETS.settlements)

.filter(function (r) { return String(r.id).trim() !== ''; })

.map(function (r) {

return {

id: String(r.id),

fromPerson: String(r.fromPerson || '').trim(),

toPerson: String(r.toPerson || '').trim(),

amount: Number(r.amount) || 0,

note: String(r.note || ''),

timestamp: toIso(r.timestamp),

date: toDateStr(r.date) || toDateStr(r.timestamp)

};

});

}

/* ============================================================

WRITE

============================================================ */

function doPost(e) {

const lock = LockService.getScriptLock();

try {

lock.waitLock(20000);

} catch (err) {

return jsonOutput({ ok: false, error: 'Server busy, please retry' });

}

try {

const body = JSON.parse(e.postData.contents);

switch (body.action) {

case 'addExpense': return jsonOutput(addExpense(body));

case 'updateExpense': return jsonOutput(updateExpense(body));

case 'deleteExpense': return jsonOutput(deleteById(SHEETS.expenses, body.id));

case 'addSettlement': return jsonOutput(addSettlement(body));

case 'deleteSettlement': return jsonOutput(deleteById(SHEETS.settlements, body.id));

case 'saveTrip': return jsonOutput(saveTrip(body));

case 'addPerson': return jsonOutput(addPerson(body));

case 'deletePerson': {

const res = deleteByFirstCol(SHEETS.people, body.name);

if (!res.ok) {

res.error = body.name + ' is not a row in the People tab — that name comes from ' +

'the recorded expenses, so it stays until those rows change.';

}

return jsonOutput(res);

}

case 'addTag': return jsonOutput(addTag(body));

case 'deleteTag': return jsonOutput(deleteByFirstCol(SHEETS.tags, body.tag));

default:

return jsonOutput({ ok: false, error: 'Unknown action: ' + body.action });

}

} catch (err) {

return jsonOutput({ ok: false, error: err.message });

} finally {

lock.releaseLock();

}

function addExpense(body) {

const clean = validateExpense(body);

if (clean.error) return { ok: false, error: clean.error };

const id = Utilities.getUuid();

clean.id = id;

clean.timestamp = new Date().toISOString();

clean.date = clean.date || today();

appendObj(getSheet(SHEETS.expenses), SHEETS.expenses, clean);

return { ok: true, id: id };

}

function updateExpense(body) {

if (!body.id) return { ok: false, error: 'Missing id' };

const sheet = getSheet(SHEETS.expenses);

const rowIndex = findRowIndex(sheet, 1, body.id);

if (rowIndex === -1) return { ok: false, error: 'Expense not found' };

const cur = readRowObj(sheet, SHEETS.expenses, rowIndex);

// Merge incoming fields over what's already stored, then validate the result.

const pick = function (key) { return body[key] !== undefined ? body[key] : cur[key]; };

const clean = validateExpense({

paidBy: pick('paidBy'),

description: pick('description'),

amount: pick('amount'),

tag: pick('tag'),

splitBetween: pick('splitBetween'),

splitMode: pick('splitMode'),

date: pick('date')

});

if (clean.error) return { ok: false, error: clean.error };

// A blank date on an older row heals from its timestamp — never from "today",

// which would silently redate the entry on an unrelated edit.

clean.date = clean.date || toDateStr(cur.timestamp);

updateRow(sheet, SHEETS.expenses, rowIndex, clean);

return { ok: true, id: body.id };

}

function validateExpense(body) {

const paidBy = String(body.paidBy || '').trim();

if (!paidBy) return { error: 'Payer is required' };

const amount = Number(body.amount);

if (!isFinite(amount) || amount <= 0) return { error: 'Amount must be a positive number' };

const date = normDate(body.date);

if (date.error) return { error: date.error };

const splitMode = String(body.splitMode || 'equal').trim().toLowerCase() === 'custom' ? 'custom' : 'equal';

let splitBetween = String(body.splitBetween || 'ALL').trim();

if (!splitBetween) splitBetween = 'ALL';

if (splitMode === 'custom') {

// Expect "Name:amount,Name:amount" and require the parts to add up.

const parts = splitBetween.split(',').map(function (s) { return s.trim(); }).filter(Boolean);

if (!parts.length) return { error: 'Custom split has no entries' };

let sum = 0;

for (let i = 0; i < parts.length; i++) {

const bits = parts[i].split(':');

if (bits.length !== 2 || !bits[0].trim()) {

return { error: 'Bad custom split entry: ' + parts[i] };

}

const v = Number(bits[1]);

if (!isFinite(v) || v < 0) return { error: 'Bad custom split amount for ' + bits[0] };

sum += v;

}

if (Math.abs(sum - amount) > 0.5) {

return { error: 'Custom split total (' + sum.toFixed(2) + ') does not match amount (' + amount.toFixed(2) + ')' };

}

return {

paidBy: paidBy,

description: String(body.description || '').trim(),

amount: Math.round(amount * 100) / 100,

tag: String(body.tag || '').trim(),

splitBetween: splitBetween,

splitMode: splitMode,

date: date.value

};

}

function addSettlement(body) {

const from = String(body.fromPerson || '').trim();

const to = String(body.toPerson || '').trim();

const amount = Number(body.amount);

if (!from || !to) return { ok: false, error: 'Both people are required' };

if (from === to) return { ok: false, error: 'From and to cannot be the same person' };

if (!isFinite(amount) || amount <= 0) return { ok: false, error: 'Amount must be a positive number' };

const date = normDate(body.date);

if (date.error) return { ok: false, error: date.error };

const id = Utilities.getUuid();

appendObj(getSheet(SHEETS.settlements), SHEETS.settlements, {

id: id,

fromPerson: from,

toPerson: to,

amount: Math.round(amount * 100) / 100,

note: String(body.note || '').trim(),

timestamp: new Date().toISOString(),

date: date.value || today()

});

return { ok: true, id: id };

}

function saveTrip(body) {

const clean = {};

if (body.name !== undefined) clean.name = String(body.name).trim();

if (body.description !== undefined) clean.description = String(body.description).trim();

const dateFields = ['startDate', 'endDate'];

for (let i = 0; i < dateFields.length; i++) {

const key = dateFields[i];

if (body[key] === undefined) continue;

const d = normDate(body[key]);

if (d.error) return { ok: false, error: d.error };

clean[key] = d.value;

}

// Validate the range the row will actually hold, not just the half being sent.

const merged = Object.assign({}, readTrip(), clean);

const rangeError = tripRangeError(merged.startDate, merged.endDate);

if (rangeError) return { ok: false, error: rangeError };

const sheet = getSheet(SHEETS.trip);

Object.keys(clean).forEach(function (key) { upsertTripField(sheet, key, clean[key]); });

return { ok: true, trip: merged };

}

function tripRangeError(startDate, endDate) {

if (startDate && endDate && endDate < startDate) return 'The trip cannot end before it starts';

return '';

}

/** Writes a detail row in place if the field is already listed, appends it if not. */

function upsertTripField(sheet, key, value) {

const h = headerMap(sheet, SHEETS.trip);

const lastRow = sheet.getLastRow();

if (lastRow >= 2) {

const keys = sheet.getRange(2, h.map.field, lastRow - 1, 1).getValues();

for (let i = 0; i < keys.length; i++) {

if (String(keys[i][0]).trim().toLowerCase() === key.toLowerCase()) {

sheet.getRange(i + 2, h.map.value).setValue(value);

return;

}

appendObj(sheet, SHEETS.trip, { field: key, value: value });

}

function addPerson(body) {

const name = String(body.name || '').trim();

if (!name) return { ok: false, error: 'Name is required' };

const existing = readRows(SHEETS.people).map(function (r) {

return String(r.name).trim().toLowerCase();

});

if (existing.indexOf(name.toLowerCase()) !== -1) {

return { ok: false, error: name + ' already exists' };

}

appendObj(getSheet(SHEETS.people), SHEETS.people, { name: name, active: true });

return { ok: true, name: name };

}

function addTag(body) {

const tag = String(body.tag || '').trim();

if (!tag) return { ok: false, error: 'Tag is required' };

const existing = readRows(SHEETS.tags).map(function (r) {

return String(r.tag).trim().toLowerCase();

});

if (existing.indexOf(tag.toLowerCase()) !== -1) {

return { ok: false, error: tag + ' already exists' };

}

appendObj(getSheet(SHEETS.tags), SHEETS.tags, { tag: tag, emoji: String(body.emoji || '').trim() });

return { ok: true, tag: tag };

}

/* ============================================================

HELPERS

============================================================ */

function getSheet(cfg) {

const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(cfg.name);

if (!sheet) {

throw new Error('Sheet tab "' + cfg.name + '" is missing. Run setupSheets() once from the Apps Script editor.');

}

return sheet;

}

/**

* Resolves every field this script knows about to a 1-indexed column, by

* matching the tab's OWN header row. Renamed-case, reordered, or extra columns

* still land in the right field. Every read and every write goes through this,

* so the two can never disagree about where a column is.

* matched = the first row really is a header row

* width = how many columns a whole-row read/write needs to cover

function headerMap(sheet, cfg) {

const lastCol = Math.max(sheet.getLastColumn(), 1);

const header = sheet.getRange(1, 1, 1, lastCol).getValues()[0].map(normHeader);

const map = {};

let matched = false;

let widest = lastCol;

cfg.headers.forEach(function (h, i) {

const found = header.indexOf(normHeader(h));

if (found !== -1) matched = true;

map[h] = (found === -1 ? i : found) + 1;

if (map[h] > widest) widest = map[h];

});

return { map: map, matched: matched, width: Math.min(widest, sheet.getMaxColumns()) };

}

function readRows(cfg) {

const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(cfg.name);

if (!sheet) return []; // tab not there yet — reads as empty

const lastRow = sheet.getLastRow();

if (lastRow < 1) return [];

const h = headerMap(sheet, cfg);

const grid = sheet.getRange(1, 1, lastRow, h.width).getValues();

const body = h.matched ? grid.slice(1) : grid; // no header row at all — row 1 is data

return body.map(function (row) {

const obj = {};

cfg.headers.forEach(function (k) {

const c = h.map[k] - 1;

obj[k] = c < row.length ? row[c] : '';

});

return obj;

});

}

/** Reads one row as an object keyed by field name. */

function readRowObj(sheet, cfg, rowIndex) {

const h = headerMap(sheet, cfg);

const row = sheet.getRange(rowIndex, 1, 1, h.width).getValues()[0];

const obj = {};

cfg.headers.forEach(function (k) { obj[k] = row[h.map[k] - 1]; });

return obj;

}

/** Appends an object, each field going to whichever column its header sits in. */

function appendObj(sheet, cfg, obj) {

const h = headerMap(sheet, cfg);

const row = [];

for (let i = 0; i < h.width; i++) row.push('');

cfg.headers.forEach(function (k) {

if (obj[k] !== undefined) row[h.map[k] - 1] = obj[k];

});

sheet.appendRow(row);

}

/** Patches only the supplied fields of an existing row, leaving the rest alone. */

function updateRow(sheet, cfg, rowIndex, obj) {

const h = headerMap(sheet, cfg);

const range = sheet.getRange(rowIndex, 1, 1, h.width);

const row = range.getValues()[0];

cfg.headers.forEach(function (k) {

if (obj[k] !== undefined) row[h.map[k] - 1] = obj[k];

});

range.setValues([row]);

}

function normHeader(s) {

return String(s == null ? '' : s).trim().toLowerCase().replace(/[^a-z0-9]/g, '');

}

function findRowIndex(sheet, col, value) {

const lastRow = sheet.getLastRow();

if (lastRow < 2) return -1;

const values = sheet.getRange(2, col, lastRow - 1, 1).getValues();

const target = String(value).trim();

for (let i = 0; i < values.length; i++) {

if (String(values[i][0]).trim() === target) return i + 2; // 1-indexed + header row

}

return -1;

}

function deleteById(cfg, id) {

if (!id) return { ok: false, error: 'Missing id' };

const sheet = getSheet(cfg);

const rowIndex = findRowIndex(sheet, 1, id);

if (rowIndex === -1) return { ok: false, error: 'Row not found' };

sheet.deleteRow(rowIndex);

return { ok: true };

}

function deleteByFirstCol(cfg, value) {

if (!value) return { ok: false, error: 'Missing value' };

const sheet = getSheet(cfg);

const rowIndex = findRowIndex(sheet, 1, value);

if (rowIndex === -1) return { ok: false, error: 'Not found' };

sheet.deleteRow(rowIndex);

return { ok: true };

}

function toIso(v) {

if (v instanceof Date) return v.toISOString();

return String(v || '');

}

function today() {

return Utilities.formatDate(new Date(), Session.getScriptTimeZone(), 'yyyy-MM-dd');

}

/** Anything date-ish -> 'YYYY-MM-DD', or '' if it is not a date at all. */

function toDateStr(v) {

if (v instanceof Date) return Utilities.formatDate(v, Session.getScriptTimeZone(), 'yyyy-MM-dd');

const m = String(v == null ? '' : v).trim().match(/^\d{4}-\d{2}-\d{2}/);

return m ? m[0] : '';

}

/**

* Validates a supplied date. Nothing supplied -> { value: '' } and the caller

* decides the default; junk or an impossible day -> { error }. Never guesses.

function normDate(v) {

if (String(v == null ? '' : v).trim() === '') return { value: '' };

const s = toDateStr(v);

if (!s) return { error: 'Date must look like YYYY-MM-DD' };

const p = s.split('-').map(Number);

const d = new Date(p[0], p[1] - 1, p[2]);

if (d.getFullYear() !== p[0] || d.getMonth() !== p[1] - 1 || d.getDate() !== p[2]) {

return { error: 'There is no such date as ' + s };

}

return { value: s };

}

function jsonOutput(obj) {

return ContentService

.createTextOutput(JSON.stringify(obj))

.setMimeType(ContentService.MimeType.JSON);

}

/* ============================================================

SELF CHECK — select runSelfTest in the editor and hit Run.

Touches no sheet; fails loudly if the derive logic breaks.

============================================================ */

function runSelfTest() {

const expenses = [

{ paidBy: 'Ravi', splitBetween: 'ALL', splitMode: 'equal', tag: 'food' },

{ paidBy: 'Asha', splitBetween: 'Asha:400,Dhruv:600', splitMode: 'custom', tag: '' },

{ paidBy: 'Meera', splitBetween: 'Meera, Ravi', splitMode: 'equal', tag: 'stay' }

];

const settlements = [{ fromPerson: 'Dhruv', toPerson: 'ravi', amount: 100 }];

assertEq(derivePeople(expenses, settlements, ['Asha']).join(','),

'Asha,Ravi,Dhruv,Meera',

'people derived from rows: seed first, ALL skipped, case-folded dupes dropped');

assertEq(derivePeople([], [], []).length, 0, 'nothing in, nothing out');

assertEq(deriveTags(expenses, [{ tag: 'food', emoji: '🍽️' }])

.map(function (t) { return t.tag + '|' + t.emoji; }).join(','),

'food|🍽️,stay|',

'tags: seed emoji kept, unseeded tag picked up from expenses');

// --- dates ---

assertEq(normDate('2026-08-14').value, '2026-08-14', 'a good date passes through');

assertEq(normDate('').value, '', 'nothing supplied stays blank for the caller to default');

assertEq(normDate(new Date(2026, 7, 14)).value, '2026-08-14', 'a real Date from the sheet is accepted');

assertEq(!!normDate('2026-02-30').error, true, '30 February is rejected, not shifted to March');

assertEq(!!normDate('14/08/2026').error, true, 'ambiguous day-first text is rejected');

assertEq(toDateStr('2026-08-14T10:00:00.000Z'), '2026-08-14', 'a timestamp yields its day');

assertEq(toDateStr('rubbish'), '', 'non-dates yield blank');

assertEq(validateExpense({ paidBy: 'A', amount: 10, date: '2026-08-14' }).date, '2026-08-14',

'validateExpense keeps the supplied date');

assertEq(!!validateExpense({ paidBy: 'A', amount: 10, date: 'nope' }).error, true,

'validateExpense refuses a junk date');

// --- trip details ---

assertEq(tripRangeError('2026-08-14', '2026-08-19'), '', 'a forward range is fine');

assertEq(tripRangeError('2026-08-19', '2026-08-14') !== '', true, 'ending before starting is refused');

assertEq(tripRangeError('', '2026-08-19'), '', 'half a range is not yet an error');

assertEq(!!saveTripWouldReject('nonsense'), true, 'a junk trip date is refused');

Logger.log('self test OK');

}

/** Pure slice of saveTrip's validation, so the self check needs no sheet. */

function saveTripWouldReject(dateValue) {

return normDate(dateValue).error || '';

}

function assertEq(actual, expected, label) {

if (actual !== expected) {

throw new Error('FAIL — ' + label + '\n got: ' + actual + '\n want: ' + expected);

}

trip-split/AppsScript.gs at main · kothariji/trip-split · GitHub

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