<?php

declare(strict_types=1);

namespace Fbrinker\ExtensionCheck\Command;

use Closure;
use Fbrinker\ExtensionCheck\Extension\ExtensionCheck;
use Fbrinker\ExtensionCheck\Output\SymfonyStyleFactory;
use Fbrinker\ExtensionCheck\Parser\FileParser;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\ProgressBar;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputDefinition;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class CheckCommand extends Command
{
    private const ARG_DIRECTORY = 'directory';
    private const OPT_EXCLUDE = 'exclude';

    protected static $defaultName = 'check';
    private $symfonyStyleFactory;
    private $fileParser;
    private $extensionCheck;

    public function __construct(
        SymfonyStyleFactory $symfonyStyleFactory,
        FileParser $fileParser,
        ExtensionCheck $extensionCheck
    ) {
        parent::__construct();
        $this->symfonyStyleFactory = $symfonyStyleFactory;
        $this->fileParser = $fileParser;
        $this->extensionCheck = $extensionCheck;
    }

    protected function configure(): void
    {
        $this
            ->setDescription('Checks extensions...')
            ->setHelp('This command allows you to check your extensions...')
            ->setDefinition(
                new InputDefinition([
                    new InputArgument(self::ARG_DIRECTORY, InputArgument::OPTIONAL, "The directory to scan", "./"),
                    new InputOption(self::OPT_EXCLUDE, null, InputArgument::OPTIONAL | InputOption::VALUE_IS_ARRAY, "Exclude specific extensions", []),
                ])
            );
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = ($this->symfonyStyleFactory)($input, $output);

        $io->section("Analyzing Files");

        $scanDir = $input->getArgument(self::ARG_DIRECTORY);
        if (empty($scanDir) || !\is_string($scanDir)) {
            $scanDir = './';
        }

        $excludedExtensionOpts = $input->getOption(self::OPT_EXCLUDE);
        $excludedExtensions = [];
        if (is_array($excludedExtensionOpts) && !empty($excludedExtensionOpts)) {
            foreach ($excludedExtensionOpts as $excludedExtensionOpt) {
                $extensions = explode(",", $excludedExtensionOpt);
                foreach ($extensions as $extension) {
                    $excludedExtensions[] = \strtolower(trim($extension));
                }
            }
            $this->extensionCheck->setExcludedExtenstions($excludedExtensions);
        }

        $this->fileParser->scanForFiles($scanDir);
        $fileCount = $this->fileParser->getFileCount();
        $io->text(sprintf('Files: %d', $fileCount));
        $io->newLine();

        $progressBar = $this->getStyledProgressBar($output, $fileCount);
        $progressBar->start();

        [$classes, $functions, $constants] = $this->fileParser->parseFiles(
            $this->getProgressBarClosure($progressBar)
        );

        $progressBar->finish();
        $io->newLine(2);
        $io->text("Calls to check:");
        $io->text(sprintf(
            "%d Classes, %d Functions, %d Constants",
            count($classes),
            count($functions),
            count($constants)
        ));

        $io->section("Checking Extension Usages");
        $io->text(sprintf('Loaded Extensions: %d', $this->extensionCheck->getLoadedExtensionsCount()));
        if (!empty($excludedExtensions)) {
            $io->text(sprintf("Excluded Extensions: %s", implode(", ", $excludedExtensions)));
        }
        $io->newLine();
        $totalUsagesToCheck = count($classes) + count($functions);
        $progressBar = $this->getStyledProgressBar($output, $totalUsagesToCheck);
        $progressBar->start();

        $usedExtensions = $this->extensionCheck->checkUsages(
            $classes,
            $functions,
            $constants,
            $this->getProgressBarClosure($progressBar)
        );

        $progressBar->finish();
        $io->newLine(2);

        $unusedExtensions = $this->extensionCheck->getUnused(array_keys($usedExtensions));
        $io->text(sprintf(
            "<fg=green>%d</> Used, <fg=red>%d</> Unused",
            count($usedExtensions),
            count($unusedExtensions)
        ));

        $io->section("Result");
        $io->text("Used Extensions:");
        $tmp = array_keys($usedExtensions);
        natcasesort($tmp);
        foreach ($tmp as $usedExtension) {
            $reason = $usedExtensions[$usedExtension];
            $io->text(sprintf(
                ' <fg=green>%s</> %s <comment>[Usage: %s]</>',
                "\u{2713}",
                $usedExtension,
                implode(", ", array_keys($reason))
            ));
        }

        $io->newLine();

        $io->text("Unused Extensions:");
        foreach ($unusedExtensions as $unusedExtension) {
            $io->text(sprintf(
                ' <fg=red>%s</> %s',
                "\u{2717}",
                $unusedExtension
            ));
        }

        return Command::SUCCESS;
    }

    private function getProgressBarClosure(ProgressBar $progressBar): Closure
    {
        return function () use ($progressBar) {
            $progressBar->advance();
        };
    }

    private function getStyledProgressBar(OutputInterface $output, int $maxValue): ProgressBar
    {
        $progressBar = new ProgressBar($output, $maxValue);
        $progressBar->setBarCharacter('<info>=</info>');
        $progressBar->setEmptyBarCharacter(' ');
        $progressBar->setProgressCharacter('>');

        return $progressBar;
    }
}