<?php
/*
simple-gitv - a simple, libre web-based Git project viewer
Copyright (C) 2020

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

// get version
$version = trim(file_get_contents("docs/version"));

// include assorted important utilities
include "src/utils.php";

// read arguments from user config
$config = parse_ini_file("config.ini");
$repos = strip_trailing_slash($config["repositories"]);
$title = $config["title"];
$theme = $config["theme"];

// get file to serve based on URL
$url = strip_trailing_slash(substr($_SERVER['REQUEST_URI'], 1));
$page_type = get_page_type($url);

if ($page_type === "invalid") {
	include "src/errors/404.php";
	die();
}

// homepage does not need to check for Git repo
if ($page_type === "home") {
	include "src/pages/home.php";
	die();
}

// get Git repo
$project = before_first_slash($url);
$git_dir = get_git_dir("$repos/$project");

// 404 if not a git directory
if (! $git_dir) {
	include "src/errors/404.php";
	die();
}

// use cached version if it exists, otherwise make it
$last_commit = get_last_commit_time($git_dir);
if (file_exists("cache/$url.html") && $last_commit < filemtime("cache/$url.html")) {
	include "cache/$url.html";
} else {
	// create directory in cache if it doesn't exist
	$directory = "cache/" . before_last_slash($url);
	if (!file_exists($directory)) {
		mkdir($directory, 0777, true);
	}

	// create cached file
	ob_start();

	// get default branch
	$branch = get_main_git_branch($git_dir);

	include "src/pages/$page_type.php";
	$cache_file = fopen("cache/$url.html", 'w');
	fwrite($cache_file, ob_get_contents());
	fclose($cache_file);
	ob_end_flush();
}
?>