<?php declare(strict_types=1);
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Diff\Output;

use PHPUnit\Framework\TestCase;
use SebastianBergmann\Diff\Differ;

/**
 * @covers SebastianBergmann\Diff\Output\AbstractChunkOutputBuilder
 *
 * @uses SebastianBergmann\Diff\Differ
 * @uses SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder
 * @uses SebastianBergmann\Diff\TimeEfficientLongestCommonSubsequenceCalculator
 */
final class AbstractChunkOutputBuilderTest extends TestCase
{
    /**
     * @param array  $expected
     * @param string $from
     * @param string $to
     * @param int    $lineThreshold
     *
     * @dataProvider provideGetCommonChunks
     */
    public function testGetCommonChunks(array $expected, string $from, string $to, int $lineThreshold = 5): void
    {
        $output = new class extends AbstractChunkOutputBuilder {
            public function getDiff(array $diff): string
            {
                return '';
            }

            public function getChunks(array $diff, $lineThreshold)
            {
                return $this->getCommonChunks($diff, $lineThreshold);
            }
        };

        $this->assertSame(
            $expected,
            $output->getChunks((new Differ)->diffToArray($from, $to), $lineThreshold)
        );
    }

    public function provideGetCommonChunks(): array
    {
        return[
            'same (with default threshold)' => [
                [],
                'A',
                'A',
            ],
            'same (threshold 0)' => [
                [0 => 0],
                'A',
                'A',
                0,
            ],
            'empty' => [
                [],
                '',
                '',
            ],
            'single line diff' => [
                [],
                'A',
                'B',
            ],
            'below threshold I' => [
                [],
                "A\nX\nC",
                "A\nB\nC",
            ],
            'below threshold II' => [
                [],
                "A\n\n\n\nX\nC",
                "A\n\n\n\nB\nC",
            ],
            'below threshold III' => [
                [0 => 5],
                "A\n\n\n\n\n\nB",
                "A\n\n\n\n\n\nA",
            ],
            'same start' => [
                [0 => 5],
                "A\n\n\n\n\n\nX\nC",
                "A\n\n\n\n\n\nB\nC",
            ],
            'same start long' => [
                [0 => 13],
                "\n\n\n\n\n\n\n\n\n\n\n\n\n\nA",
                "\n\n\n\n\n\n\n\n\n\n\n\n\n\nB",
            ],
            'same part in between' => [
                [2 => 8],
                "A\n\n\n\n\n\n\nX\nY\nZ\n\n",
                "B\n\n\n\n\n\n\nX\nA\nZ\n\n",
            ],
            'same trailing' => [
                [2 => 14],
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                "B\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
            ],
            'same part in between, same trailing' => [
                [2 => 7, 10 => 15],
                "A\n\n\n\n\n\n\nA\n\n\n\n\n\n\n",
                "B\n\n\n\n\n\n\nB\n\n\n\n\n\n\n",
            ],
            'below custom threshold I' => [
                [],
                "A\n\nB",
                "A\n\nD",
                2,
            ],
            'custom threshold I' => [
                [0 => 1],
                "A\n\nB",
                "A\n\nD",
                1,
            ],
            'custom threshold II' => [
                [],
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                19,
            ],
            [
                [3 => 9],
                "a\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk",
                "a\np\nc\nd\ne\nf\ng\nh\ni\nw\nk",
            ],
            [
                [0 => 5, 8 => 13],
                "A\nA\nA\nA\nA\nA\nX\nC\nC\nC\nC\nC\nC",
                "A\nA\nA\nA\nA\nA\nB\nC\nC\nC\nC\nC\nC",
            ],
            [
                [0 => 5, 8 => 13],
                "A\nA\nA\nA\nA\nA\nX\nC\nC\nC\nC\nC\nC\nX",
                "A\nA\nA\nA\nA\nA\nB\nC\nC\nC\nC\nC\nC\nY",
            ],
        ];
    }
}