<?php

namespace Tests\Unit;

use App\Support\BlankPlaceholderRenderer;
use PHPUnit\Framework\TestCase;

class BlankPlaceholderRendererTest extends TestCase
{
    public function test_fill_stem_canonical_2562_dollar_around_a_only(): void
    {
        // questions.id=2562 本源：$a$ 与横线分段，横线在 $…$ 外；不得出现 </span>$时 这类误插 $。
        $stem = '当$a$=__________时，$2(2a-3)$的值比$3(a+1)$的值大$1$.';

        [$rendered, $changed] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertTrue($changed);
        $this->assertStringNotContainsString('</span>$时', $rendered);
        $this->assertMatchesRegularExpression('/\$2\(2a-3\)\$/u', $rendered);
        $this->assertMatchesRegularExpression('/当\$a\$=/u', $rendered);
    }

    public function test_fill_stem_malformed_missing_close_dollar_before_han_still_repaired(): void
    {
        // 脏数据：仅 $a=__________（$a 与横线同一数学段且漏写收尾 $）时补闭合，避免吞段。
        $stem = '当$a=__________时，$2(2a-3)$的值比$3(a+1)$的值大$1$.';

        [$rendered, $changed] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertTrue($changed);
        $this->assertStringNotContainsString('</span>$时', $rendered);
        $this->assertMatchesRegularExpression('/\$2\(2a-3\)\$/u', $rendered);
    }

    public function test_inline_math_with_normal_parentheses_not_turned_to_blank(): void
    {
        $stem = '设$f(x)=\sin(x)$，则$g(2)$的值是__________。';

        [$rendered] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertStringContainsString('sin(x)', $rendered);
        $this->assertStringContainsString('g(2)', $rendered);
        $this->assertStringContainsString('border-bottom:1.2px dashed', $rendered);
    }

    public function test_left_quad_right_not_at_suffix_stays_in_formula(): void
    {
        // 段末不是「…=\left(\quad\right)」完整后缀时，不转为下划线（避免误伤中段记号）。
        $stem = '若$x=\left(\quad\right)+1$，则$y=__________。';

        [$rendered] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertStringContainsString('\\left(\\quad\\right)', $rendered);
    }

    public function test_fill_degree_after_plain_blank_not_prefixed_with_stray_dollar(): void
    {
        // questions.id=332：inline $40^{\circ}$ 后又出现「向左拐______度」，中间无 $；
        // closeMissing 不得误用上一段公式的收尾 $，否则会出现「……横线 $度」。
        $stem = '一辆汽车在笔直的公路上行驶，第一次向左拐 $40^{\circ}$，若经第二次拐弯后，运动路线与原来的路线平行，则第二次拐弯是否向右拐或向左拐______度。';

        [$rendered] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertStringContainsString('</span>度', $rendered);
        $this->assertStringNotContainsString('</span>$度', $rendered);
    }

    public function test_choice_stem_trailing_left_quad_right_becomes_blank_line(): void
    {
        // questions.id=30949：段末 $=\left(\quad\right)$ 意图为答题横线，转为段外下划线再渲染为标准空位。
        $stem = '在三角形$ABC$中，$AC=3，AB=4，\angle CAB=120^{\circ}$，则$\left(\overrightarrow{AB}+\overrightarrow{AC}\right)\cdot\overrightarrow{AB}=\left(\quad\right)$';

        [$rendered] = BlankPlaceholderRenderer::replaceToBlankSpan(
            $stem,
            BlankPlaceholderRenderer::defaultBlankSpan(),
            false,
            false
        );

        $this->assertStringContainsString('border-bottom:1.2px dashed', $rendered);
        $this->assertStringContainsString('min-width:80px', $rendered);
        $this->assertStringNotContainsString('\\left(\\quad\\right)', $rendered);
        $this->assertStringNotContainsString('TOKEN', $rendered);
        $this->assertStringContainsString('\\overrightarrow{AB}', $rendered);
    }
}