class Clover

final class Clover {
    
    /**
     * @throws WriteOperationFailedException
     */
    public function process(CodeCoverage $coverage, ?string $target = null, ?string $name = null) : string {
        $time = (string) time();
        $xmlDocument = new DOMDocument('1.0', 'UTF-8');
        $xmlDocument->formatOutput = true;
        $xmlCoverage = $xmlDocument->createElement('coverage');
        $xmlCoverage->setAttribute('generated', $time);
        $xmlDocument->appendChild($xmlCoverage);
        $xmlProject = $xmlDocument->createElement('project');
        $xmlProject->setAttribute('timestamp', $time);
        if (is_string($name)) {
            $xmlProject->setAttribute('name', $name);
        }
        $xmlCoverage->appendChild($xmlProject);
        $packages = [];
        $report = $coverage->getReport();
        foreach ($report as $item) {
            if (!$item instanceof File) {
                continue;
            }
            
            /* @var File $item */
            $xmlFile = $xmlDocument->createElement('file');
            $xmlFile->setAttribute('name', $item->pathAsString());
            $classes = $item->classesAndTraits();
            $coverageData = $item->lineCoverageData();
            $lines = [];
            $namespace = 'global';
            foreach ($classes as $className => $class) {
                $classStatements = 0;
                $coveredClassStatements = 0;
                $coveredMethods = 0;
                $classMethods = 0;
                foreach ($class['methods'] as $methodName => $method) {
                    if ($method['executableLines'] == 0) {
                        continue;
                    }
                    $classMethods++;
                    $classStatements += $method['executableLines'];
                    $coveredClassStatements += $method['executedLines'];
                    if ($method['coverage'] == 100) {
                        $coveredMethods++;
                    }
                    $methodCount = 0;
                    foreach (range($method['startLine'], $method['endLine']) as $line) {
                        if (isset($coverageData[$line])) {
                            $methodCount = max($methodCount, count($coverageData[$line]));
                        }
                    }
                    $lines[$method['startLine']] = [
                        'ccn' => $method['ccn'],
                        'count' => $methodCount,
                        'crap' => $method['crap'],
                        'type' => 'method',
                        'visibility' => $method['visibility'],
                        'name' => $methodName,
                    ];
                }
                if (!empty($class['package']['namespace'])) {
                    $namespace = $class['package']['namespace'];
                }
                $xmlClass = $xmlDocument->createElement('class');
                $xmlClass->setAttribute('name', $className);
                $xmlClass->setAttribute('namespace', $namespace);
                if (!empty($class['package']['fullPackage'])) {
                    $xmlClass->setAttribute('fullPackage', $class['package']['fullPackage']);
                }
                if (!empty($class['package']['category'])) {
                    $xmlClass->setAttribute('category', $class['package']['category']);
                }
                if (!empty($class['package']['package'])) {
                    $xmlClass->setAttribute('package', $class['package']['package']);
                }
                if (!empty($class['package']['subpackage'])) {
                    $xmlClass->setAttribute('subpackage', $class['package']['subpackage']);
                }
                $xmlFile->appendChild($xmlClass);
                $xmlMetrics = $xmlDocument->createElement('metrics');
                $xmlMetrics->setAttribute('complexity', (string) $class['ccn']);
                $xmlMetrics->setAttribute('methods', (string) $classMethods);
                $xmlMetrics->setAttribute('coveredmethods', (string) $coveredMethods);
                $xmlMetrics->setAttribute('conditionals', (string) $class['executableBranches']);
                $xmlMetrics->setAttribute('coveredconditionals', (string) $class['executedBranches']);
                $xmlMetrics->setAttribute('statements', (string) $classStatements);
                $xmlMetrics->setAttribute('coveredstatements', (string) $coveredClassStatements);
                $xmlMetrics->setAttribute('elements', (string) ($classMethods + $classStatements + $class['executableBranches']));
                $xmlMetrics->setAttribute('coveredelements', (string) ($coveredMethods + $coveredClassStatements + $class['executedBranches']));
                $xmlClass->appendChild($xmlMetrics);
            }
            foreach ($coverageData as $line => $data) {
                if ($data === null || isset($lines[$line])) {
                    continue;
                }
                $lines[$line] = [
                    'count' => count($data),
                    'type' => 'stmt',
                ];
            }
            ksort($lines);
            foreach ($lines as $line => $data) {
                $xmlLine = $xmlDocument->createElement('line');
                $xmlLine->setAttribute('num', (string) $line);
                $xmlLine->setAttribute('type', $data['type']);
                if (isset($data['name'])) {
                    $xmlLine->setAttribute('name', $data['name']);
                }
                if (isset($data['visibility'])) {
                    $xmlLine->setAttribute('visibility', $data['visibility']);
                }
                if (isset($data['ccn'])) {
                    $xmlLine->setAttribute('complexity', (string) $data['ccn']);
                }
                if (isset($data['crap'])) {
                    $xmlLine->setAttribute('crap', (string) $data['crap']);
                }
                $xmlLine->setAttribute('count', (string) $data['count']);
                $xmlFile->appendChild($xmlLine);
            }
            $linesOfCode = $item->linesOfCode();
            $xmlMetrics = $xmlDocument->createElement('metrics');
            $xmlMetrics->setAttribute('loc', (string) $linesOfCode['linesOfCode']);
            $xmlMetrics->setAttribute('ncloc', (string) $linesOfCode['nonCommentLinesOfCode']);
            $xmlMetrics->setAttribute('classes', (string) $item->numberOfClassesAndTraits());
            $xmlMetrics->setAttribute('methods', (string) $item->numberOfMethods());
            $xmlMetrics->setAttribute('coveredmethods', (string) $item->numberOfTestedMethods());
            $xmlMetrics->setAttribute('conditionals', (string) $item->numberOfExecutableBranches());
            $xmlMetrics->setAttribute('coveredconditionals', (string) $item->numberOfExecutedBranches());
            $xmlMetrics->setAttribute('statements', (string) $item->numberOfExecutableLines());
            $xmlMetrics->setAttribute('coveredstatements', (string) $item->numberOfExecutedLines());
            $xmlMetrics->setAttribute('elements', (string) ($item->numberOfMethods() + $item->numberOfExecutableLines() + $item->numberOfExecutableBranches()));
            $xmlMetrics->setAttribute('coveredelements', (string) ($item->numberOfTestedMethods() + $item->numberOfExecutedLines() + $item->numberOfExecutedBranches()));
            $xmlFile->appendChild($xmlMetrics);
            if ($namespace === 'global') {
                $xmlProject->appendChild($xmlFile);
            }
            else {
                if (!isset($packages[$namespace])) {
                    $packages[$namespace] = $xmlDocument->createElement('package');
                    $packages[$namespace]->setAttribute('name', $namespace);
                    $xmlProject->appendChild($packages[$namespace]);
                }
                $packages[$namespace]->appendChild($xmlFile);
            }
        }
        $linesOfCode = $report->linesOfCode();
        $xmlMetrics = $xmlDocument->createElement('metrics');
        $xmlMetrics->setAttribute('files', (string) count($report));
        $xmlMetrics->setAttribute('loc', (string) $linesOfCode['linesOfCode']);
        $xmlMetrics->setAttribute('ncloc', (string) $linesOfCode['nonCommentLinesOfCode']);
        $xmlMetrics->setAttribute('classes', (string) $report->numberOfClassesAndTraits());
        $xmlMetrics->setAttribute('methods', (string) $report->numberOfMethods());
        $xmlMetrics->setAttribute('coveredmethods', (string) $report->numberOfTestedMethods());
        $xmlMetrics->setAttribute('conditionals', (string) $report->numberOfExecutableBranches());
        $xmlMetrics->setAttribute('coveredconditionals', (string) $report->numberOfExecutedBranches());
        $xmlMetrics->setAttribute('statements', (string) $report->numberOfExecutableLines());
        $xmlMetrics->setAttribute('coveredstatements', (string) $report->numberOfExecutedLines());
        $xmlMetrics->setAttribute('elements', (string) ($report->numberOfMethods() + $report->numberOfExecutableLines() + $report->numberOfExecutableBranches()));
        $xmlMetrics->setAttribute('coveredelements', (string) ($report->numberOfTestedMethods() + $report->numberOfExecutedLines() + $report->numberOfExecutedBranches()));
        $xmlProject->appendChild($xmlMetrics);
        $buffer = $xmlDocument->saveXML();
        if ($target !== null) {
            if (!str_contains($target, '://')) {
                Filesystem::createDirectory(dirname($target));
            }
            if (@file_put_contents($target, $buffer) === false) {
                throw new WriteOperationFailedException($target);
            }
        }
        return $buffer;
    }

}