<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Divi\Design;

use LIT\MCP\Integrations\Divi\Design\CustomCssDiff;
use PHPUnit\Framework\TestCase;

final class CustomCssDiffTest extends TestCase
{
    public function testNamesRemovedAndAddedLines(): void
    {
        $rows = CustomCssDiff::between(".a { color: red; }\n.b { margin: 0; }", ".a { color: red; }\n.c { margin: 1px; }");

        self::assertSame([
            ['action' => 'removed', 'line' => '.b { margin: 0; }'],
            ['action' => 'added', 'line' => '.c { margin: 1px; }'],
        ], $rows);
    }

    public function testEqualTextsHaveNoDiff(): void
    {
        self::assertSame([], CustomCssDiff::between(".a{}\n.b{}", ".a{}\n.b{}"));
        self::assertSame([], CustomCssDiff::between('', ''));
    }

    public function testTheNewlineEndingTheLastLineIsNoLineOfItsOwn(): void
    {
        self::assertSame([['action' => 'added', 'line' => '.b{}']], CustomCssDiff::between(".a{}\n", ".a{}\n.b{}"));
        self::assertSame('changed', CustomCssDiff::between(".a{}", ".a{}\n")[0]['action']);
    }

    public function testRepeatedLinesCountAsOften(): void
    {
        $rows = CustomCssDiff::between("x\nx", "x\nx\nx");

        self::assertSame([['action' => 'added', 'line' => 'x']], $rows);
    }

    public function testAChangeWithoutAnyDifferingLineIsStillShown(): void
    {
        self::assertSame('changed', CustomCssDiff::between("a\nb", "b\na")[0]['action']);
        self::assertSame('changed', CustomCssDiff::between("a\r\nb", "a\nb")[0]['action']);
    }

    public function testCutsLongLinesAndLongDiffs(): void
    {
        $long = CustomCssDiff::between('', str_repeat('x', 300))[0]['line'];
        $rows = CustomCssDiff::between('', implode("\n", array_map(static fn (int $i): string => "l$i", range(1, 150))));

        self::assertSame(201, mb_strlen($long));
        self::assertCount(101, $rows);
        self::assertSame(['action' => 'more', 'line' => '… und 50 weitere Zeilen'], $rows[100]);
    }

    public function testSummaryCountsLinesAndBytes(): void
    {
        self::assertSame(
            'Eigenes CSS: 1 Zeilen hinzugefügt, 1 entfernt (3 → 3 Bytes).',
            CustomCssDiff::summary("a\nb", "a\nc")
        );
    }
}