// Ported from js-yaml v3.13.1:
// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { Type } from "../type.ts";
const YAML_DATE_REGEXP = new RegExp("^([0-9][0-9][0-9][0-9])" + // [1] year
"-([0-9][0-9])" + // [2] month
"-([0-9][0-9])$");
const YAML_TIMESTAMP_REGEXP = new RegExp("^([0-9][0-9][0-9][0-9])" + // [1] year
"-([0-9][0-9]?)" + // [2] month
"-([0-9][0-9]?)" + // [3] day
"(?:[Tt]|[ \\t]+)" + // ...
"([0-9][0-9]?)" + // [4] hour
":([0-9][0-9])" + // [5] minute
":([0-9][0-9])" + // [6] second
"(?:\\.([0-9]*))?" + // [7] fraction
"(?:[ \\t]*(Z|([-+])([0-9][0-9]?)" + // [8] tz [9] tz_sign [10] tz_hour
"(?::([0-9][0-9]))?))?$");
function resolveYamlTimestamp(data) {
  if (data === null) return false;
  if (YAML_DATE_REGEXP.exec(data) !== null) return true;
  if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
  return false;
}
function constructYamlTimestamp(data) {
  let match = YAML_DATE_REGEXP.exec(data);
  if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
  if (match === null) throw new Error("Date resolve error");
  // match: [1] year [2] month [3] day
  const year = +match[1];
  const month = +match[2] - 1; // JS month starts with 0
  const day = +match[3];
  if (!match[4]) {
    // no hour
    return new Date(Date.UTC(year, month, day));
  }
  // match: [4] hour [5] minute [6] second [7] fraction
  const hour = +match[4];
  const minute = +match[5];
  const second = +match[6];
  let fraction = 0;
  if (match[7]) {
    let partFraction = match[7].slice(0, 3);
    while(partFraction.length < 3){
      // milli-seconds
      partFraction += "0";
    }
    fraction = +partFraction;
  }
  // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
  let delta = null;
  if (match[9] && match[10]) {
    const tzHour = +match[10];
    const tzMinute = +(match[11] || 0);
    delta = (tzHour * 60 + tzMinute) * 60000; // delta in milli-seconds
    if (match[9] === "-") delta = -delta;
  }
  const date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
  if (delta) date.setTime(date.getTime() - delta);
  return date;
}
function representYamlTimestamp(date) {
  return date.toISOString();
}
export const timestamp = new Type("tag:yaml.org,2002:timestamp", {
  construct: constructYamlTimestamp,
  instanceOf: Date,
  kind: "scalar",
  represent: representYamlTimestamp,
  resolve: resolveYamlTimestamp
});
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