4 files changed, 155 insertions, 0 deletions
diff --git a/autoload.php b/autoload.php
new file mode 100644
index 0000000..cb673fa
--- /dev/null
+++ b/autoload.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+spl_autoload_register(function (string $class)
+{
+    $base_dir = __DIR__ . '/src/';
+
+    $file = $base_dir . str_replace('\\', '/', $class) . '.php';
+
+    if (file_exists($file)) {
+        require $file;
+    }
+});
diff --git a/public/index.php b/public/index.php
new file mode 100644
index 0000000..df80ef3
--- /dev/null
+++ b/public/index.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+use DTS\BookmarkRepository;
+
+require_once(__DIR__.'/../autoload.php');
+
+$config = require_once(__DIR__.'/../config.php');
+
+$sort = $_GET['sort'] ?? null;
+
+$tag = $_GET['tag'] ?? null;
+
+$bookmarks = new BookmarkRepository($config['path_to_repository']);
+
+$bookmarks->load();
+
+if ($tag !== null) {
+    $bookmarks->filter($tag);
+}
+
+$bookmarks->sort($sort === 'asc');
+
+foreach ($bookmarks as $bookmark) {
+    echo $bookmark->url.'  '.$bookmark->addedAt."<br/>";
+}
diff --git a/src/DTS/Bookmark.php b/src/DTS/Bookmark.php
new file mode 100644
index 0000000..93c7a29
--- /dev/null
+++ b/src/DTS/Bookmark.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DTS;
+
+class Bookmark
+{
+    public string $id;
+
+    public string $url;
+
+    public string $tag;
+
+    public string $addedAt;
+
+    public bool $read;
+
+    function __construct(string $id, string $url, string $tag, string $addedAt, bool $read)
+    {
+        $this->id = $id;
+        $this->url = $url;
+        $this->tag = $tag;
+        $this->addedAt = $addedAt;
+        $this->read = $read;
+    }
+}
diff --git a/src/DTS/BookmarkRepository.php b/src/DTS/BookmarkRepository.php
new file mode 100644
index 0000000..deb188c
--- /dev/null
+++ b/src/DTS/BookmarkRepository.php
@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DTS;
+
+class BookmarkRepository implements \Iterator
+{
+    private string $pathToRepository;
+
+    private array $repository = [];
+
+    private int $position = 0;
+
+    function __construct(string $pathToRepository)
+    {
+        $this->pathToRepository = $pathToRepository;
+    }
+
+    public function load(): void
+    {
+        if (!is_file($this->pathToRepository) || !is_readable($this->pathToRepository)) {
+            throw new \Exception("Unable to locate repository {$this->pathToRepository}");
+        }
+
+        if (($fp = fopen($this->pathToRepository, 'r')) === FALSE) {
+            throw new \Exception("Unable to read from repository {$this->pathToRepository}");
+        }
+
+        while (($data = fgetcsv($fp)) !== FALSE) {
+            $this->repository[] = new Bookmark(
+                $data[0],       // Id.
+                $data[1],       // Url.
+                $data[2],       // Tag.
+                $data[3],       // Added At.
+                (bool)$data[4], // Read.
+            );
+        }
+
+        fclose($fp);
+    }
+
+    public function sort(bool $asc = true): BookmarkRepository
+    {
+        usort($this->repository, function ($a, $b) use ($asc) {
+            return $asc ? $a->addedAt <=> $b->addedAt
+                : $b->addedAt <=> $a->addedAt;
+        });
+
+        return $this;
+    }
+
+    public function filter(string $tag): BookmarkRepository
+    {
+        $this->repository = array_filter(
+            $this->repository,
+            fn($bookmark) => $bookmark->tag === $tag
+        );
+
+        return $this;
+    }
+
+    public function current(): mixed
+    {
+        return $this->repository[$this->position];
+    }
+
+    public function key(): mixed
+    {
+        return $this->position;
+    }
+
+    public function next(): void
+    {
+        ++$this->position;
+    }
+
+    public function rewind(): void
+    {
+        $this->position = 0;
+    }
+
+    public function valid(): bool
+    {
+        return isset($this->repository[$this->position]);
+    }
+}