const { I } = inject();
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module.exports = {
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_dateInputId: "__test_date_format__",
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/**
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* Browsers use system date format for input[type=date], not locale,
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* and inputs don't provide any API to get this format or user input,
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* only the final value in ISO format.
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* So we fill in some specific input and check the result.
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* Depending on system settings, entered digits can go to different places,
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* generating one of 4 possible date formats —year can only be at the beginning
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* or at the end.
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* We focus only on formats with full numeric day, month and year (DD and YYYY).
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* @returns {Promise<string>} date format of y, m, d (e.g. 'ymd')
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*/
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async detectDateFormat() {
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// create invisible date input
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await I.executeScript(
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({ id }) => {
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const date = document.createElement("input");
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date.type = "date";
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date.id = id;
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Object.assign(date.style, {
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position: "absolute",
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top: 0,
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opacity: 0,
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});
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document.body.appendChild(date);
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},
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{ id: this._dateInputId },
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);
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I.fillField(`#${this._dateInputId}`, "01020304");
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const format = await I.executeScript(
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({ id }) => {
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const date = document.getElementById(id) as HTMLInputElement;
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const value = date.value; // always ISO format
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switch (value) {
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case "0102-04-03":
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return "ydm";
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case "0102-03-04":
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return "ymd";
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case "0304-02-01":
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return "dmy";
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case "0304-01-02":
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return "mdy";
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default:
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return "ymd";
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}
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},
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{ id: this._dateInputId },
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);
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// remove this input
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await I.executeScript(
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({ id }) => {
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(document.getElementById(id) as HTMLInputElement).remove();
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},
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{ id: this._dateInputId },
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);
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return format;
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},
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};
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