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1 files changed, 162 insertions, 0 deletions

diff --git a/src/DTS/TodoRepository.php b/src/DTS/TodoRepository.php
new file mode 100644
index 0000000..5ec759f
--- /dev/null
+++ b/src/DTS/TodoRepository.php
@@ -0,0 +1,162 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DTS;
+
+use DTS\Todo;
+
+class TodoRepository implements \Iterator
+{
+    private string $pathToRepository;
+
+    private array $repository = [];
+
+    private array $tags = [];
+
+    private int $position = 0;
+
+    function __construct(string $pathToRepository)
+    {
+        $this->pathToRepository = $pathToRepository;
+
+        $this->load();
+    }
+
+    public function sort(bool $asc = true): TodoRepository
+    {
+        usort($this->repository, function ($a, $b) use ($asc) {
+            return $asc ? $a->task <=> $b->task
+                : $b->task <=> $a->task;
+        });
+
+        return $this;
+    }
+
+    public function filter(string $tag): TodoRepository
+    {
+        $this->repository = array_filter(
+            $this->repository,
+            fn($todo) => $todo->tag === $tag
+        );
+
+        return $this;
+    }
+
+    public function find(string $id): ?Todo
+    {
+        return $this->repository[$id] ?? null;
+    }
+
+    public function add(Todo $todo): bool
+    {
+        $this->repository[] = $todo;
+
+        return $this->save();
+    }
+
+    public function update(Todo $todo): bool
+    {
+        if (array_key_exists($todo->id, $this->repository)) {
+            $this->repository[$todo->id] = $todo;
+
+            return $this->save();
+        }
+
+        return false;
+    }
+
+    public function delete(Todo $todo): bool
+    {
+        if (array_key_exists($todo->id, $this->repository)) {
+            unset($this->repository[$todo->id]);
+
+            return $this->save();
+        }
+
+        return false;
+    }
+
+    public function tags(): array
+    {
+        return $this->tags;
+    }
+
+    public function current()
+    {
+        return $this->repository[$this->position];
+    }
+
+    public function key()
+    {
+        return $this->position;
+    }
+
+    public function next(): void
+    {
+        ++$this->position;
+    }
+
+    public function rewind(): void
+    {
+        $this->position = 0;
+    }
+
+    public function valid(): bool
+    {
+        return isset($this->repository[$this->position]);
+    }
+
+    private function load(): void
+    {
+        if (!is_file($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}");
+        }
+
+        $id = 0;
+
+        while (($data = fgetcsv($fp)) !== FALSE) {
+            $todo = new Todo();
+
+            $todo->id = $id++;
+            $todo->task = $data[0];
+            $todo->tag = $data[1];
+            $todo->addedAt = $data[2];
+
+            $this->repository[] = $todo;
+
+            $this->tags[] = $todo->tag;
+        }
+
+        $this->tags = array_filter(array_unique($this->tags));
+
+        sort($this->tags);
+
+        fclose($fp);
+    }
+
+    private function save(): bool
+    {
+        if (($fp = fopen($this->pathToRepository, 'w')) === FALSE) {
+            throw new \Exception("Unable to open repository {$this->pathToRepository}");
+        }
+
+        $success = true;
+
+        foreach ($this->repository as $todo) {
+            $success = $success && fputcsv($fp, [
+                $todo->task,
+                $todo->tag,
+                $todo->addedAt,
+            ]) !== false;
+        }
+
+        fclose($fp);
+
+        return $success;
+    }
+}