"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");
const { calculateCredits } = require("../src/lib/credits");

const config = {
  baseCredits: 1,
  includedChars: 25000,
  stepChars: 10000,
  stepCredits: 1,
  maxCharsPerArticle: 120000,
};

test("charges base credit up to included chars", () => {
  assert.equal(calculateCredits(1, config), 1);
  assert.equal(calculateCredits(25000, config), 1);
});

test("charges one extra credit after crossing step boundary", () => {
  assert.equal(calculateCredits(25001, config), 2);
  assert.equal(calculateCredits(35000, config), 2);
});

test("charges multiple steps correctly", () => {
  assert.equal(calculateCredits(45001, config), 4);
});

test("rejects oversized articles", () => {
  assert.throws(() => calculateCredits(120001, config), /article_too_long/);
});

test("rejects non-positive charCount", () => {
  assert.throws(() => calculateCredits(0, config), /charCount must be a positive integer/);
});