#!/usr/bin/env php
<?php

	$wd = getcwd();

	$ref = $argv[1] ?? '' ?: 'master';

	$git_dir = shell_exec('git rev-parse --show-toplevel');

	if(!$git_dir) {
		fprintf(STDERR, 'Not inside a git path');
		exit(1);
	}

	$list_raw = explode(PHP_EOL, trim(shell_exec("git branch --list --format '%(objectname) %(refname:short)  %(committerdate)'")));
	$branches = [];
	$shas = [];
	foreach($list_raw as $row)
	{
		$columns = explode(' ', $row, 3);
		$columns = array_values(array_filter($columns));
		$branches[$columns[1]] = [
			'sha' => $columns[0],
			'name' => $columns[1],
			'date' => $columns[2],
			'time' => strtotime($columns[2]),
		];
		$shas[$columns[0]] = [];
	}
	foreach(array_keys($shas) as $sha)
	{
		$log = trim(shell_exec('git log --oneline ' . $ref . '..' . $sha));
		if($log)
		{
			$shas[$sha] = count(explode(PHP_EOL, $log));
			continue;
		}

		$log = trim(shell_exec('git log --oneline ' . $sha . '..' . $ref));
		if($log)
		{
			$shas[$sha] = -count(explode(PHP_EOL, $log));
			continue;
		}

		$shas[$sha] = 0;
	}
	foreach(array_keys($branches) as $branch)
	{
		$branches[$branch]['commits'] = $shas[$branches[$branch]['sha']];
	}

	if(empty($branches[$ref]))
	{
		$branches[$ref] = [
			'sha' => $ref,
			'name' => $ref,
			'date' => null,
			'time' => 0,
			'commits' => 0,
		];
	}

	usort($branches, function($a, $b) {
		if($a['commits'] < 1 && $b['commits'] > 0)
		{
			return 1;
		}
		if($a['commits'] > 0 && $b['commits'] < 1)
		{
			return -1;
		}
		if($a['time'] !== $b['time'])
		{
			return $b['time'] - $a['time'];
		}
		if($a['commits'] !== $b['commits'])
		{
			return $b['commits'] - $a['commits'];
		}
		return strcmp($a['name'], $b['name']);
	});

	$timelimit = time() - 12*3600;

	foreach($branches as $branch)
	{
		if($branch['commits']) {
			printf(
				"%5d  %10s  %s\n",
				$branch['commits'],
				date($branch['time'] < $timelimit ? 'Y-m-d' : ' H:i:s ', $branch['time']),
				$branch['name']
			);
		} else {
			echo '                -- ', $branch['name'], ' --', PHP_EOL;
		}
	}