<?php

namespace PHPGit\Command;

use PHPGit\Command;

/**
 * Summarize 'git log' output - `git shortlog`
 *
 * @author Kazuyuki Hayashi <hayashi@valnur.net>
 */
class ShortlogCommand extends Command
{

    /**
     * Summarize 'git log' output
     *
     * ``` php
     * $git = new PHPGit\Git();
     * $git->setRepository('/path/to/repo');
     * $shortlog = $git->shortlog();
     * ```
     *
     * ##### Output Example
     *
     * ``` php
     * [
     *     'John Doe <john@example.com>' => [
     *         0 => ['commit' => '589de67', 'date' => new \DateTime('2014-02-10 12:56:15 +0300'), 'subject' => 'Update README'],
     *         1 => ['commit' => '589de67', 'date' => new \DateTime('2014-02-15 12:56:15 +0300'), 'subject' => 'Update README'],
     *     ],
     *     //...
     * ]
     * ```
     * @param string|array|\Traversable $commits [optional] Defaults to HEAD
     *
     * @return array
     */
    public function __invoke($commits = 'HEAD')
    {
        $builder = $this->git->getProcessBuilder()
            ->add('shortlog')
            ->add('--numbered')
            ->add('--format=')
            ->add('-w256,2,2')
            ->add('-e');

        if (!is_array($commits) && !($commits instanceof \Traversable)) {
            $commits = array($commits);
        }

        foreach ($commits as $commit) {
            $builder->add($commit);
        }

        $process = $builder->getProcess();
        $process->setCommandLine(str_replace('--format=', '--format=%h|%ci|%s', $process->getCommandLine()));

        $output = $this->git->run($process);
        $lines  = $this->split($output);
        $result = array();
        $author = null;

        foreach ($lines as $line) {
            if (substr($line, 0, 1) != ' ') {
                if (preg_match('/([^<>]*? <[^<>]+>)/', $line, $matches)) {
                    $author = $matches[1];
                    $result[$author] = array();
                }
                continue;
            }

            list ($commit, $date, $subject) = explode('|', trim($line), 3);
            $result[$author][] = array(
                'commit'  => $commit,
                'date'    => new \DateTime($date),
                'subject' => $subject
            );
        }

        return $result;
    }

    /**
     * Suppress commit description and provide a commit count summary only
     *
     * ``` php
     * $git = new PHPGit\Git();
     * $git->setRepository('/path/to/repo');
     * $shortlog = $git->shortlog->summary();
     * ```
     *
     * ##### Output Example
     *
     * ``` php
     * [
     *     'John Doe <john@example.com>' => 153,
     *     //...
     * ]
     * ```
     *
     * @param string $commits [optional] Defaults to HEAD
     *
     * @return array
     */
    public function summary($commits = 'HEAD')
    {
        $builder = $this->git->getProcessBuilder()
            ->add('shortlog')
            ->add('--numbered')
            ->add('--summary')
            ->add('-e');

        if (!is_array($commits) && !($commits instanceof \Traversable)) {
            $commits = array($commits);
        }

        foreach ($commits as $commit) {
            $builder->add($commit);
        }

        $output = $this->git->run($builder->getProcess());
        $lines  = $this->split($output);
        $result = array();

        foreach ($lines as $line) {
            list ($commits, $author) = explode("\t", trim($line), 2);
            $result[$author] = (int) $commits;
        }

        return $result;
    }

}