import { test, expect } from '@playwright/test';

// These tests cover the "post the whole form, hx-select what to swap" behaviour
// on the transaction edit page. Each edit hits its own route, the server
// re-renders the entire form, and the client selects what to swap back -- with
// no out-of-band swaps and no morph extension:
//   - discrete changes (vendor, account, location, mode, add/remove row) swap
//     all of #wizard-form (the active action/tab round-trips through the form,
//     so it survives the swap);
//   - typed fields never swap the input the user is in -- the amount field swaps
//     only the #account-totals tbody (a sibling of the input rows), and the memo
//     posts with hx-swap=none.
// Because the active input is never part of a swapped region, focus and caret
// survive a plain swap.

// Collect any uncaught page errors or console errors so a swap that throws
// (e.g. a tooltip callback dereferencing a stale $refs) fails the test loudly.
function trackErrors(page: any): string[] {
  const errors: string[] = [];
  page.on('pageerror', (e: any) => errors.push('pageerror: ' + e.message));
  page.on('console', (m: any) => {
    if (m.type() === 'error') errors.push('console: ' + m.text());
  });
  return errors;
}

async function openManualAdvanced(page: any, transactionIndex = 0) {
  await page.goto('/transaction2');
  await page.waitForSelector('table tbody tr');
  await page
    .locator('button[hx-get*="/transaction2/"][hx-get*="/edit"]')
    .nth(transactionIndex)
    .click();
  await page.waitForSelector('#modal-holder[x-show="open"]', { state: 'visible' });
  await page.waitForSelector('#wizardmodal');
  await page.click('button:has-text("Manual")');

  // First transaction has no accounts so it opens in "simple" mode. Switch to
  // advanced mode (a whole-form swap) so the account grid is present.
  const advancedLink = page.locator('a:has-text("Switch to advanced mode")');
  if (await advancedLink.count()) {
    await advancedLink.first().click();
    await page.waitForSelector('#account-grid-body');
  }
}

// Drives the vendor typeahead like a user: open the dropdown, inject a result
// (Solr is unavailable in tests), click it, and wait for the whole-form swap.
async function selectVendor(page: any, vendorId: number, label: string) {
  const vendor = page
    .locator('div[hx-vals*="vendor-changed"]')
    .first()
    .locator('div.relative[x-data]')
    .first();
  await vendor.locator('a[x-ref="input"]').click();
  const search = page.locator('[data-tippy-root] input[x-model="search"]').first();
  await search.waitFor({ state: 'visible' });
  await search.fill('xx');
  await vendor.evaluate((el: HTMLElement, opt: { id: number; label: string }) => {
    (window as any).Alpine.$data(el).elements = [{ value: opt.id, label: opt.label }];
  }, { id: vendorId, label });

  const swap = page.waitForResponse(
    (r: any) =>
      r.url().includes('edit-form-changed') &&
      r.request().method() === 'POST' &&
      r.status() === 200
  );
  await page.locator('[data-tippy-root] a', { hasText: label }).first().click();
  await swap;
  await page.waitForTimeout(400);
}

// Removes every existing account row (each remove is its own whole-form swap), so a
// test starts from a known-empty state regardless of what earlier tests saved
// onto the shared transaction.
async function clearAccounts(page: any) {
  // eslint-disable-next-line no-constant-condition
  while (true) {
    const removeButtons = page.locator('#account-grid-body .account-remove-action');
    const count = await removeButtons.count();
    if (count === 0) break;
    await removeButtons.first().click();
    await expect
      .poll(async () => page.locator('#account-grid-body .account-remove-action').count())
      .toBeLessThan(count);
  }
}

test.describe.configure({ mode: 'serial' });

test.describe('Transaction Edit whole-form swap', () => {
  test('whole-form swaps (toggle mode, add account) do not throw', async ({ page }) => {
    const errors = trackErrors(page);

    await openManualAdvanced(page, 0);

    // Add an account row -- another whole-form swap.
    await page
      .locator('#account-grid-body')
      .locator('button:has-text("New account"), a:has-text("New account")')
      .first()
      .click();

    await expect
      .poll(async () => page.locator('#account-grid-body tbody tr.account-row').count())
      .toBeGreaterThan(0);

    // The form must survive the swap intact.
    await expect(page.locator('#wizard-form')).toHaveCount(1);
    expect(errors, errors.join('\n')).toEqual([]);
  });

  test('keeps focus and typed value in the amount field across a swap', async ({ page }) => {
    const errors = trackErrors(page);

    await openManualAdvanced(page, 0);

    // Ensure exactly one account row exists.
    const rows = await page.locator('#account-grid-body tbody tr.account-row').count();
    if (rows === 0) {
      await page
        .locator('#account-grid-body')
        .locator('button:has-text("New account"), a:has-text("New account")')
        .first()
        .click();
      await expect
        .poll(async () => page.locator('#account-grid-body tbody tr.account-row').count())
        .toBeGreaterThan(0);
    }

    const amount = page.locator('.account-amount-field').first();
    await amount.waitFor();

    // Type a clean value via the keyboard. Typing fires the field's htmx trigger
    // (keyup), which posts the whole form but swaps back only the #account-totals
    // tbody -- a sibling of this input's row, so the input is never replaced. It's
    // type=number (no text caret), so we assert focus + node identity + value.
    await amount.click();
    await amount.press('Control+a');

    const amountSwap = page.waitForResponse(
      (r: any) =>
        r.url().includes('edit-form-changed') &&
        r.request().method() === 'POST' &&
        r.status() === 200
    );
    await amount.pressSequentially('150', { delay: 40 });

    // Identify the live focused node (before the debounced swap lands) so we can
    // prove the *same* node survives.
    await page.evaluate(() => {
      (window as any).__focusedAmount = document.activeElement;
    });

    await amountSwap;
    await page.waitForTimeout(300);

    const state = await page.evaluate(() => {
      const active = document.activeElement as HTMLInputElement;
      return {
        sameNode: active === (window as any).__focusedAmount,
        isAmountField: !!active && active.classList.contains('account-amount-field'),
        value: active ? active.value : null,
      };
    });

    // Focus must stay on the amount field after the swap...
    expect(state.isAmountField).toBe(true);
    // ...on the very same DOM node (the input is never part of the swapped region)...
    expect(state.sameNode).toBe(true);
    // ...with the value the user typed left intact.
    expect(state.value).toBe('150');

    // The TOTAL must have recomputed server-side from the posted amount and been
    // applied via the #account-totals swap.
    await expect(page.locator('.account-total-row #total')).toContainText('150');

    expect(errors, errors.join('\n')).toEqual([]);
  });

  test('memo edits issue no request and keep their value/caret', async ({ page }) => {
    const errors = trackErrors(page);

    // Memo affects nothing else in the form, so editing it must NOT issue a
    // request at all -- its value just rides along in the form until save.
    let memoRequests = 0;
    page.on('request', (r: any) => {
      if (r.url().includes('edit-form-changed') && r.method() === 'POST') memoRequests++;
    });

    await page.goto('/transaction2');
    await page.waitForSelector('table tbody tr');
    await page.locator('button[hx-get*="/transaction2/"][hx-get*="/edit"]').nth(0).click();
    await page.waitForSelector('#wizardmodal');

    const memo = page.locator('#edit-memo');
    await memo.waitFor();

    // Clear any seeded memo text and type "hello".
    await memo.click();
    await memo.press('Control+a');
    await memo.pressSequentially('hello', { delay: 40 });

    // Drop the caret in the middle and insert a char -> "heXllo", caret -> 3.
    await memo.evaluate((el: HTMLInputElement) => {
      el.focus();
      el.setSelectionRange(2, 2);
    });
    await page.evaluate(() => {
      (window as any).__focusedMemo = document.activeElement;
    });
    await memo.press('X');

    // Give the old debounce window a chance to (not) fire.
    await page.waitForTimeout(500);

    const state = await page.evaluate(() => {
      const active = document.activeElement as HTMLInputElement;
      return {
        sameNode: active === (window as any).__focusedMemo,
        id: active ? active.id : null,
        value: active ? active.value : null,
        caret: active ? active.selectionStart : null,
      };
    });

    // No request fired, and the value/caret are simply intact (nothing swapped).
    expect(memoRequests).toBe(0);
    expect(state.id).toBe('edit-memo');
    expect(state.sameNode).toBe(true);
    expect(state.value).toBe('heXllo');
    expect(state.caret).toBe(3);

    expect(errors, errors.join('\n')).toEqual([]);
  });

  test('choosing an account from the typeahead does not throw and persists', async ({ page }) => {
    const errors = trackErrors(page);

    await openManualAdvanced(page, 0);

    // Start from a clean, empty account row so selecting the account actually
    // changes accountId (and fires the change-gated whole-form swap).
    await clearAccounts(page);
    await page
      .locator('#account-grid-body')
      .locator('button:has-text("New account"), a:has-text("New account")')
      .first()
      .click();
    await expect
      .poll(async () => page.locator('#account-grid-body tbody tr.account-row').count())
      .toBeGreaterThan(0);

    const row = page.locator('#account-grid-body tbody tr.account-row').first();
    const typeahead = row.locator('div.relative[x-data]').first();

    // Open the dropdown (tippy renders the popper into [data-tippy-root]).
    await typeahead.locator('a[x-ref="input"]').click();
    const search = page.locator('[data-tippy-root] input[x-model="search"]').first();
    await search.waitFor({ state: 'visible' });

    // Account search is backed by Solr (unavailable in tests), so type under the
    // 3-char threshold and inject a clickable result into the typeahead state --
    // the click handler, tippy.hide(), Alpine reactivity and the HTMX swap all run
    // exactly as in production.
    await search.fill('te');
    const testInfo = await (await page.request.get('/test-info')).json();
    const accountId: number = testInfo.accounts['test-account'];
    await typeahead.evaluate((el: HTMLElement, id: number) => {
      (window as any).Alpine.$data(el).elements = [{ value: id, label: 'Test Account' }];
    }, accountId);

    // Clicking the result runs `value = element; tippy.hide(); ...` and dispatches
    // the change that fires the whole-form swap.
    const swap = page.waitForResponse(
      (r: any) =>
        r.url().includes('edit-form-changed') &&
        r.request().method() === 'POST' &&
        r.status() === 200
    );
    await page.locator('[data-tippy-root] a', { hasText: 'Test Account' }).first().click();
    await swap;
    await page.waitForTimeout(300);

    // The chosen account must survive the whole-form swap.
    const hidden = page
      .locator('#account-grid-body tbody tr.account-row')
      .first()
      .locator('input[type="hidden"][name*="transaction-account/account"]')
      .first();
    await expect(hidden).toHaveValue(accountId.toString());

    expect(errors, errors.join('\n')).toEqual([]);
  });

  test('selecting a vendor populates its default account across the swap', async ({ page }) => {
    const errors = trackErrors(page);

    // Open the modal in simple mode (transaction 0 has no accounts).
    await page.goto('/transaction2');
    await page.waitForSelector('table tbody tr');
    await page.locator('button[hx-get*="/transaction2/"][hx-get*="/edit"]').nth(0).click();
    await page.waitForSelector('#wizardmodal');
    await page.click('button:has-text("Manual")');
    await page.waitForSelector('div[hx-vals*="vendor-changed"]');

    const testInfo = await (await page.request.get('/test-info')).json();
    const vendorId: number = testInfo.accounts.vendor;
    const defaultAccountId: number = testInfo.accounts['test-account'];

    // Drive the vendor typeahead like a user: open dropdown, inject a result
    // (Solr is unavailable in tests), click it.
    const vendor = page.locator('div[hx-vals*="vendor-changed"]').first().locator('div.relative[x-data]').first();
    await vendor.locator('a[x-ref="input"]').click();
    const search = page.locator('[data-tippy-root] input[x-model="search"]').first();
    await search.waitFor({ state: 'visible' });
    await search.fill('te');
    await vendor.evaluate((el: HTMLElement, id: number) => {
      (window as any).Alpine.$data(el).elements = [{ value: id, label: 'Test Vendor' }];
    }, vendorId);

    const swap = page.waitForResponse(
      (r: any) =>
        r.url().includes('edit-form-changed') &&
        r.request().method() === 'POST' &&
        r.status() === 200
    );
    await page.locator('[data-tippy-root] a', { hasText: 'Test Vendor' }).first().click();
    await swap;
    await page.waitForTimeout(400);

    // The vendor's default account must now be reflected in the account field.
    // Because the section is rebuilt fresh from the server (no preserved Alpine
    // state), the server-driven account value lands without any keying tricks.
    const accountHidden = page
      .locator('input[type="hidden"][name*="transaction-account/account"]')
      .first();
    await expect(accountHidden).toHaveValue(defaultAccountId.toString());

    // The displayed account label should resolve too.
    await expect(page.locator('span[x-text="value.label"]', { hasText: 'Test Account' })).toBeVisible();

    expect(errors, errors.join('\n')).toEqual([]);
  });

  test('changing the vendor a second time still updates it', async ({ page }) => {
    const errors = trackErrors(page);

    await page.goto('/transaction2');
    await page.waitForSelector('table tbody tr');
    await page.locator('button[hx-get*="/transaction2/"][hx-get*="/edit"]').nth(0).click();
    await page.waitForSelector('#wizardmodal');
    await page.click('button:has-text("Manual")');
    await page.waitForSelector('div[hx-vals*="vendor-changed"]');

    const testInfo = await (await page.request.get('/test-info')).json();
    const vendor1: number = testInfo.accounts.vendor;
    const vendor2: number = testInfo.accounts.vendor2;
    const account1: number = testInfo.accounts['test-account'];
    const account2: number = testInfo.accounts['second-account'];

    const vendorLabel = page
      .locator('div[hx-vals*="vendor-changed"] span[x-text="value.label"]')
      .first();
    const accountHidden = page
      .locator('input[type="hidden"][name*="transaction-account/account"]')
      .first();

    // First vendor.
    await selectVendor(page, vendor1, 'Test Vendor');
    await expect(vendorLabel).toHaveText('Test Vendor');
    await expect(accountHidden).toHaveValue(account1.toString());

    // Second vendor -- the regression guard: the section (and its vendor
    // typeahead) is rebuilt fresh on every swap, so a second change still fires
    // its request and updates the default account.
    await selectVendor(page, vendor2, 'Second Vendor');
    await expect(vendorLabel).toHaveText('Second Vendor');
    await expect(accountHidden).toHaveValue(account2.toString());

    // And back again, to be sure it keeps working.
    await selectVendor(page, vendor1, 'Test Vendor');
    await expect(vendorLabel).toHaveText('Test Vendor');
    await expect(accountHidden).toHaveValue(account1.toString());

    expect(errors, errors.join('\n')).toEqual([]);
  });
});