import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { formatGradeState } from '../src/mcp/tools/submissions.ts';

/**
 * The schema has no textual grade — `grade` is a 0-100 percentage and
 * `gradeComment` is free text — but teachers commonly grade with the comment
 * alone. These cases keep the wording honest about which of those happened.
 */
describe('formatGradeState', () => {
	it('reports a percentage as a percentage, not a bare number', () => {
		assert.equal(formatGradeState({ isGraded: true, grade: 85 }, false), 'graded **85%**');
	});

	it('keeps 0% distinct from "no grade given"', () => {
		assert.equal(formatGradeState({ isGraded: true, grade: 0 }, false), 'graded **0%**');
	});

	it('treats feedback alone as the verdict, not as missing data', () => {
		// The real case: teacher wrote "OK" and set no percentage.
		assert.equal(
			formatGradeState({ isGraded: true, grade: null }, true),
			'graded by feedback, with no percentage given',
		);
	});

	it('mentions both when a percentage and feedback are present', () => {
		assert.equal(formatGradeState({ isGraded: true, grade: 70 }, true), 'graded **70%**, with feedback');
	});

	it('falls back to the percentage read off the page when the API omits it', () => {
		assert.equal(formatGradeState({ isGraded: true, grade: null }, false, 40), 'graded **40%**');
	});

	it('says plainly when graded but nothing at all was found', () => {
		assert.match(
			formatGradeState({ isGraded: true, grade: null }, false),
			/neither a percentage nor feedback was found/,
		);
	});

	it('does not claim a grade for an ungraded submission', () => {
		assert.equal(formatGradeState({ isGraded: false, grade: null }, false), 'not graded yet');
		assert.equal(formatGradeState({ isGraded: false, grade: null }, true), 'not graded yet');
	});
});