// Copyright 2018-2026 the Deno authors. MIT license.

import type { Comparator, SemVer } from "./types.ts";
import { isWildcardComparator } from "./_shared.ts";
import { compare } from "./compare.ts";

function testComparator(version: SemVer, comparator: Comparator): boolean {
  if (isWildcardComparator(comparator)) {
    return true;
  }
  const cmp = compare(version, comparator);
  switch (comparator.operator) {
    case "=":
    case undefined: {
      return cmp === 0;
    }
    case "!=": {
      return cmp !== 0;
    }
    case ">": {
      return cmp > 0;
    }
    case "<": {
      return cmp < 0;
    }
    case ">=": {
      return cmp >= 0;
    }
    case "<=": {
      return cmp <= 0;
    }
  }
}

export function testComparatorSet(version: SemVer, set: Comparator[]): boolean {
  for (const comparator of set) {
    if (!testComparator(version, comparator)) return false;
  }
  if (!version.prerelease?.length) return true;

  // Find the comparator that is allowed to have prereleases
  // For example, ^1.2.3-pr.1 desugars to >=1.2.3-pr.1 <2.0.0
  // That should allow `1.2.3-pr.2` to pass.
  // However, `1.2.4-alpha.notready` should NOT be allowed,
  // even though it's within the range set by the comparators.
  for (const comparator of set) {
    if (isWildcardComparator(comparator)) continue;
    if (!comparator.prerelease?.length) continue;
    const { major, minor, patch } = comparator;
    if (
      version.major === major &&
      version.minor === minor &&
      version.patch === patch
    ) {
      return true;
    }
  }

  return false;
}