<?php declare(strict_types=1);
/*
 * This file is part of sebastian/code-unit-reverse-lookup.
 *
 * (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\CodeUnitReverseLookup;

use function array_merge;
use function assert;
use function class_exists;
use function function_exists;
use function get_declared_classes;
use function get_declared_traits;
use function get_defined_functions;
use function is_array;
use function is_int;
use function is_string;
use function range;
use function trait_exists;
use ReflectionClass;
use ReflectionFunction;
use ReflectionMethod;

final class Wizard
{
    /**
     * @var array<string, array<int, string>>
     */
    private array $lookupTable = [];

    /**
     * @var array<class-string, true>
     */
    private array $processedClasses = [];

    /**
     * @var array<string, true>
     */
    private array $processedFunctions = [];

    public function lookup(string $filename, int $lineNumber): string
    {
        if (!isset($this->lookupTable[$filename][$lineNumber])) {
            $this->updateLookupTable();
        }

        if (isset($this->lookupTable[$filename][$lineNumber])) {
            return $this->lookupTable[$filename][$lineNumber];
        }

        return $filename . ':' . $lineNumber;
    }

    private function updateLookupTable(): void
    {
        $this->processClassesAndTraits();
        $this->processFunctions();
    }

    private function processClassesAndTraits(): void
    {
        $classes = get_declared_classes();
        $traits  = get_declared_traits();

        assert(is_array($traits));

        foreach (array_merge($classes, $traits) as $classOrTrait) {
            assert(class_exists($classOrTrait) || trait_exists($classOrTrait));

            if (isset($this->processedClasses[$classOrTrait])) {
                continue;
            }

            foreach ((new ReflectionClass($classOrTrait))->getMethods() as $method) {
                $this->processFunctionOrMethod($method);
            }

            $this->processedClasses[$classOrTrait] = true;
        }
    }

    private function processFunctions(): void
    {
        foreach (get_defined_functions()['user'] as $function) {
            assert(function_exists($function));

            if (isset($this->processedFunctions[$function])) {
                continue;
            }

            $this->processFunctionOrMethod(new ReflectionFunction($function));

            $this->processedFunctions[$function] = true;
        }
    }

    private function processFunctionOrMethod(ReflectionFunction|ReflectionMethod $functionOrMethod): void
    {
        if ($functionOrMethod->isInternal()) {
            return;
        }

        $name = $functionOrMethod->getName();

        if ($functionOrMethod instanceof ReflectionMethod) {
            $name = $functionOrMethod->getDeclaringClass()->getName() . '::' . $name;
        }

        $fileName = $functionOrMethod->getFileName();

        assert(is_string($fileName));

        if (!isset($this->lookupTable[$fileName])) {
            $this->lookupTable[$fileName] = [];
        }

        $startLine = $functionOrMethod->getStartLine();
        $endLine   = $functionOrMethod->getEndLine();

        assert(is_int($startLine));
        assert(is_int($endLine));
        assert($endLine >= $startLine);

        foreach (range($startLine, $endLine) as $line) {
            $this->lookupTable[$fileName][$line] = $name;
        }
    }
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox