import type { Locator, Page } from '@playwright/test';

import { randomInt, randomUUID } from 'crypto';

type SelectorType = 'gSelect' | 'grafanaSelect';
type SelectDropdownValueArgs = {
  page: Page;
  value: string;
  // if set, search for a dropdown that contains this text as its placeholder
  placeholderText?: string;
  // specifies which type of select dropdown we are dealing with (since we currently mix-and-match 3 different components...)
  selectType?: SelectorType;
  // if provided, use this Locator as the root of our search for the dropdown
  startingLocator?: Locator;
  // if true, when selecting the dropdown option, use an exact match, otherwise use a substring contains match
  optionExactMatch?: boolean;

  // if true, will press enter in the select dropdown. Some dropdowns don't show a list of options
  // and instead the user must press enter to trigger the search
  pressEnterInsteadOfSelectingOption?: boolean;
};

type ClickButtonArgs = {
  page: Page;
  buttonText: string | RegExp;
  // if provided, use this Locator as the root of our search for the button
  startingLocator?: Locator;
  exact?: boolean;
};

export const fillInInput = (page: Page, selector: string, value: string) => page.fill(selector, value);

export const fillInInputByPlaceholderValue = (page: Page, placeholderValue: string, value: string) =>
  fillInInput(page, `input[placeholder*="${placeholderValue}"]`, value);

export const getInputByName = (page: Page, name: string): Locator => page.locator(`input[name="${name}"]`);

export const clickButton = async ({ page, buttonText, startingLocator, exact }: ClickButtonArgs): Promise<void> => {
  const baseLocator = startingLocator || page;
  await baseLocator.getByRole('button', { name: buttonText, disabled: false, exact }).click();
};

/**
 * at a minimum must specify selectType OR placeholderText
 * if both are specified selectType takes precedence
 */
const openSelect = async ({
  page,
  placeholderText,
  selectType,
  startingLocator,
}: SelectDropdownValueArgs): Promise<Locator> => {
  /**
   * we currently mix three different dropdown components in the UI..
   * so we need to support all of them :(
   */
  const dropdownSelectors: Record<SelectorType, string> = {
    gSelect: 'div[class*="GSelect"]',
    grafanaSelect: `div[class*="grafana-select-value-container"] ${
      placeholderText ? `>> text=${placeholderText} ` : ''
    }>> ..`,
  };

  const dropdownSelector = dropdownSelectors[selectType];
  const placeholderSelector = `text=${placeholderText}`;
  const selector = dropdownSelector || placeholderSelector;

  const selectElement: Locator = (startingLocator || page).locator(selector);
  await selectElement.waitFor({ state: 'visible' });
  await selectElement.click();

  return selectElement;
};

/**
 * notice the difference in double quotes - https://playwright.dev/docs/selectors#text-selector
 */
const textMatchSelector = (optionExactMatch: boolean, value: string): string =>
  optionExactMatch ? `text="${value}"` : `text=${value}`;

const chooseDropdownValue = async ({ page, value, optionExactMatch = true }: SelectDropdownValueArgs): Promise<void> =>
  page.locator(`div[id^="react-select-"][id$="-listbox"] >> ${textMatchSelector(optionExactMatch, value)}`).click();

export const selectDropdownValue = async (args: SelectDropdownValueArgs): Promise<Locator> => {
  const { page, value, pressEnterInsteadOfSelectingOption } = args;

  const selectElement = await openSelect(args);
  await selectElement.pressSequentially(value);

  if (pressEnterInsteadOfSelectingOption) {
    await page.keyboard.press('Enter');
  } else {
    await chooseDropdownValue(args);
  }

  return selectElement;
};

export const generateRandomValue = (): string => randomUUID();

export const generateRandomValidLabel = (length = 10) => {
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
  let result = '';
  for (let i = 0; i < length; i++) {
    const randomIndex = randomInt(0, characters.length);
    result += characters[randomIndex];
  }
  return result;
};

/**
 * wait for the options to appear
 *
 * note that they are not rendered next to the button in the HTML output
 * they're rendered closer to the <body> tag
 */
export const selectValuePickerValue = async (
  page: Page,
  valuePickerText: string,
  optionExactMatch = true
): Promise<void> =>
  (
    await page.waitForSelector(
      `div[class*="grafana-select-menu"] >> ${textMatchSelector(optionExactMatch, valuePickerText)}`
    )
  ).click();

export const openDropdown = async ({ page, text }: { page: Page; text: string | RegExp }) =>
  page.locator('div').filter({ hasText: text }).nth(1).click();