<?php

namespace UbsCsvTransformer\Tests;

use PHPUnit\Framework\TestCase;
use UbsCsvTransformer\DebugLogger;
use UbsCsvTransformer\MetadataExtractor;

class MetadataExtractorTest extends TestCase
{
    protected function setUp(): void
    {
        DebugLogger::reset();
    }

    // -------------------------------------------------------------------------
    // Happy path
    // -------------------------------------------------------------------------

    public function testExtractBasicCapture(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'account_iban',
            'lineNumber'   => 1,
            'regex'        => '([A-Z]{2}\d{2}[\w]+)',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract(['Account: CH9300762011623852957']);
        $this->assertSame('CH9300762011623852957', $result['account_iban']);
    }

    public function testExtractFromSecondLine(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'currency',
            'lineNumber'   => 2,
            'regex'        => '(CHF|EUR|USD)',
            'captureGroup' => 1,
        ]]);
        $lines = ['Account info', 'Currency: CHF'];
        $result = $extractor->extract($lines);
        $this->assertSame('CHF', $result['currency']);
    }

    public function testExtractCaptureGroup0ReturnsFullMatch(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'label',
            'lineNumber'   => 1,
            'regex'        => 'CHF',
            'captureGroup' => 0,
        ]]);
        $result = $extractor->extract(['Balance: CHF 1000']);
        $this->assertSame('CHF', $result['label']);
    }

    public function testExtractMultipleRules(): void
    {
        $extractor = new MetadataExtractor([
            [
                'name'         => 'iban',
                'lineNumber'   => 1,
                'regex'        => '([A-Z]{2}\d{2}\w+)',
                'captureGroup' => 1,
            ],
            [
                'name'         => 'currency',
                'lineNumber'   => 2,
                'regex'        => '(CHF|EUR)',
                'captureGroup' => 1,
            ],
        ]);
        $result = $extractor->extract(['IBAN: CH9300762011623852957', 'Currency: CHF']);
        $this->assertSame('CH9300762011623852957', $result['iban']);
        $this->assertSame('CHF', $result['currency']);
    }

    // -------------------------------------------------------------------------
    // Line not available
    // -------------------------------------------------------------------------

    public function testExtractMissingLineIsSkipped(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'account_iban',
            'lineNumber'   => 5,
            'regex'        => '(CH\d+)',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract(['Only one line']);
        $this->assertArrayNotHasKey('account_iban', $result);
    }

    // -------------------------------------------------------------------------
    // Invalid regex
    // -------------------------------------------------------------------------

    public function testExtractInvalidRegexDoesNotCrash(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'bad_rule',
            'lineNumber'   => 1,
            'regex'        => '[invalid(regex',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract(['some line content']);
        $this->assertArrayNotHasKey('bad_rule', $result);
    }

    // -------------------------------------------------------------------------
    // No match
    // -------------------------------------------------------------------------

    public function testExtractNoMatchIsSkipped(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'account_iban',
            'lineNumber'   => 1,
            'regex'        => '(NOMATCH_\d+)',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract(['Account: CH9300762011623852957']);
        $this->assertArrayNotHasKey('account_iban', $result);
    }

    // -------------------------------------------------------------------------
    // Edge cases
    // -------------------------------------------------------------------------

    public function testExtractEmptyRulesReturnsEmptyArray(): void
    {
        $extractor = new MetadataExtractor([]);
        $result = $extractor->extract(['some line']);
        $this->assertSame([], $result);
    }

    public function testExtractEmptyLinesArrayReturnsEmpty(): void
    {
        $extractor = new MetadataExtractor([[
            'name'         => 'iban',
            'lineNumber'   => 1,
            'regex'        => '(CH\d+)',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract([]);
        $this->assertSame([], $result);
    }

    public function testRuleWithMissingNameIsSkipped(): void
    {
        $extractor = new MetadataExtractor([[
            'regex'      => '(\d+)',
            'lineNumber' => 1,
        ]]);
        $result = $extractor->extract(['123']);
        $this->assertSame([], $result);
    }

    public function testRuleWithMissingRegexIsSkipped(): void
    {
        $extractor = new MetadataExtractor([[
            'name'       => 'test',
            'lineNumber' => 1,
        ]]);
        $result = $extractor->extract(['some line']);
        $this->assertSame([], $result);
    }

    // -------------------------------------------------------------------------
    // getRuleCount
    // -------------------------------------------------------------------------

    public function testGetRuleCount(): void
    {
        $extractor = new MetadataExtractor([
            ['name' => 'a', 'regex' => 'x', 'lineNumber' => 1],
            ['name' => 'b', 'regex' => 'y', 'lineNumber' => 2],
            ['name' => 'c', 'regex' => 'z', 'lineNumber' => 3],
        ]);
        $this->assertSame(3, $extractor->getRuleCount());
    }

    public function testGetRuleCountEmptyIsZero(): void
    {
        $this->assertSame(0, (new MetadataExtractor([]))->getRuleCount());
    }

    // -------------------------------------------------------------------------
    // Regex containing '#' delimiter character
    // -------------------------------------------------------------------------

    public function testRegexContainingHashIsHandled(): void
    {
        // Pattern contains '#' which is the internal delimiter — must be escaped
        $extractor = new MetadataExtractor([[
            'name'         => 'tag',
            'lineNumber'   => 1,
            'regex'        => '(#\d+)',
            'captureGroup' => 1,
        ]]);
        $result = $extractor->extract(['Issue #42 resolved']);
        $this->assertSame('#42', $result['tag']);
    }
}