import { describe, expect, it } from "vitest";
import { contentStats, formatBytes, MAX_INLINE_SIZE } from "$lib/api/blob";

describe("contentStats", () => {
	it("counts an empty string as no lines and no bytes", () => {
		expect(contentStats("")).toEqual({ lines: 0, bytes: 0, sizeLabel: "0 B" });
	});

	it("treats a trailing newline as a terminator, matching the repo blob header", () => {
		expect(contentStats("a\nb").lines).toBe(2);
		expect(contentStats("a\nb\n").lines).toBe(2);
		expect(contentStats("a\n").lines).toBe(1);
	});

	it("sizes utf-8 rather than utf-16 code units", () => {
		expect(contentStats("é").bytes).toBe(2);
		expect(contentStats("hi").bytes).toBe(2);
	});

	it("keeps the 1MiB inline cap meaningful for the string loader", () => {
		expect(contentStats("x".repeat(MAX_INLINE_SIZE)).bytes).toBeLessThanOrEqual(
			MAX_INLINE_SIZE
		);
		expect(contentStats("x".repeat(MAX_INLINE_SIZE + 1)).bytes).toBeGreaterThan(
			MAX_INLINE_SIZE
		);
	});
});

describe("formatBytes", () => {
	it("promotes a rounded spill into the next unit", () => {
		expect(formatBytes(999)).toBe("999 B");
		expect(formatBytes(1000)).toBe("1.0 kB");
		expect(formatBytes(999_999)).toBe("1.0 MB");
	});
});