<?php

namespace PHPCensor\Plugin;

use PHPCensor;
use PHPCensor\Builder;
use PHPCensor\Model\Build;
use PHPCensor\Plugin;
use PHPCensor\ZeroConfigPluginInterface;

/**
 * Technical Debt Plugin - Checks for existence of "TODO", "FIXME", etc.
 *
 * @author James Inman <james@jamesinman.co.uk>
 */
class TechnicalDebt extends Plugin implements ZeroConfigPluginInterface
{
    /**
     * @var array
     */
    protected $suffixes;

    /**
     * @var string
     */
    protected $directory;

    /**
     * @var int
     */
    protected $allowed_errors;

    /**
     * @var array - paths to ignore
     */
    protected $ignore;

    /**
     * @var array - terms to search for
     */
    protected $searches;

    /**
     * @var array - lines of . and X to visualize errors
     */
    protected $errorPerFile = [];

    /**
     * @var int
     */
    protected $currentLineSize = 0;

    /**
     * @var int
     */
    protected $lineNumber = 0;

    /**
     * @var int
     */
    protected $numberOfAnalysedFile = 0;

   /**
    * @return string
    */
    public static function pluginName()
    {
        return 'technical_debt';
    }

    /**
     * Store the status of the file :
     *   . : checked no errors
     *   X : checked with one or more errors
     *
     * @param string $char
     */
    protected function buildLogString($char)
    {
        if (isset($this->errorPerFile[$this->lineNumber])) {
            $this->errorPerFile[$this->lineNumber] .= $char;
        } else {
            $this->errorPerFile[$this->lineNumber] = $char;
        }

        $this->currentLineSize++;
        $this->numberOfAnalysedFile++;

        if ($this->currentLineSize > 59) {
            $this->currentLineSize = 0;
            $this->lineNumber++;
        }
    }

    /**
     * Create a visual representation of file with Todo
     *  ...XX... 10/300 (10 %)
     *
     * @return string The visual representation
     */
    protected function returnResult()
    {
        $string     = '';
        $fileNumber = 0;
        foreach ($this->errorPerFile as $oneLine) {
            $fileNumber += strlen($oneLine);
            $string     .= str_pad($oneLine, 60, ' ', STR_PAD_RIGHT);
            $string     .= str_pad($fileNumber, 4, ' ', STR_PAD_LEFT);
            $string     .= "/" . $this->numberOfAnalysedFile . " (" . floor($fileNumber * 100 / $this->numberOfAnalysedFile) . " %)\n";
        }
        $string .= "Checked {$fileNumber} files\n";

        return $string;
    }

    /**
     * {@inheritdoc}
     */
    public function __construct(Builder $builder, Build $build, array $options = [])
    {
        parent::__construct($builder, $build, $options);

        $this->suffixes       = ['php'];
        $this->directory      = $this->builder->buildPath;
        $this->ignore         = $this->builder->ignore;
        $this->allowed_errors = 0;
        $this->searches       = ['TODO', 'FIXME', 'TO DO', 'FIX ME'];

        if (!empty($options['suffixes']) && is_array($options['suffixes'])) {
            $this->suffixes = $options['suffixes'];
        }

        if (!empty($options['searches']) && is_array($options['searches'])) {
            $this->searches = $options['searches'];
        }

        if (isset($options['zero_config']) && $options['zero_config']) {
            $this->allowed_errors = -1;
        }

        $this->setOptions($options);
    }

    /**
     * Handle this plugin's options.
     *
     * @param $options
     */
    protected function setOptions($options)
    {
        foreach (['directory', 'ignore', 'allowed_errors'] as $key) {
            if (array_key_exists($key, $options)) {
                $this->{$key} = $options[$key];
            }
        }
    }

    /**
     * Check if this plugin can be executed.
     *
     * @param string  $stage
     * @param Builder $builder
     * @param Build   $build
     *
     * @return boolean
     */
    public static function canExecute($stage, Builder $builder, Build $build)
    {
        if ($stage == Build::STAGE_TEST) {
            return true;
        }

        return false;
    }

    /**
    * Runs the plugin
    */
    public function execute()
    {
        $success    = true;
        $errorCount = $this->getErrorList();

        $this->builder->log($this->returnResult() . "Found $errorCount instances of " . implode(', ', $this->searches));

        $this->build->storeMeta('technical_debt-warnings', $errorCount);

        if ($this->allowed_errors !== -1 && $errorCount > $this->allowed_errors) {
            $success = false;
        }

        return $success;
    }

    /**
     * Gets the number and list of errors returned from the search
     *
     * @return integer
     */
    protected function getErrorList()
    {
        $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->directory));

        $this->builder->logDebug("Ignored path: ".json_encode($this->ignore, true));
        $errorCount = 0;

        /** @var \SplFileInfo $file */
        foreach ($iterator as $file) {
            $filePath  = $file->getRealPath();
            $extension = $file->getExtension();

            $ignored = false;
            foreach ($this->suffixes as $suffix) {
                if ($suffix !== $extension) {
                    $ignored = true;
                    break;
                }
            }

            foreach ($this->ignore as $ignore) {
                if ('/' === $ignore{0}) {
                    if (0 === strpos($filePath, $ignore)) {
                        $ignored = true;
                        break;
                    }
                } else {
                    $ignoreReal = $this->directory . $ignore;
                    if (0 === strpos($filePath, $ignoreReal)) {
                        $ignored = true;
                        break;
                    }
                }
            }

            if (!$ignored) {
                $handle      = fopen($filePath, "r");
                $lineNumber  = 1;
                $errorInFile = false;
                while (false === feof($handle)) {
                    $line = fgets($handle);

                    foreach ($this->searches as $search) {
                        if ($technicalDeptLine = trim(strstr($line, $search))) {
                            $fileName = str_replace($this->directory, '', $filePath);

                            $this->build->reportError(
                                $this->builder,
                                'technical_debt',
                                $technicalDeptLine,
                                PHPCensor\Model\BuildError::SEVERITY_LOW,
                                $fileName,
                                $lineNumber
                            );

                            $errorInFile = true;
                            $errorCount++;
                        }
                    }
                    $lineNumber++;
                }
                fclose ($handle);

                if ($errorInFile === true) {
                    $this->buildLogString('X');
                } else {
                    $this->buildLogString('.');
                }
            }
        }

        return $errorCount;
    }
}