Initial commit with I think working app.

.env.example

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+FOODSI_EMAIL=email@example.com
+FOODSI_PASSWORD=P@ssw0rd
+
+HOMEASSISTANT_URL=https://homeassistant.example.com
+HOMEASSISTANT_TOKEN=dummy_token
+HOMEASSISTANT_NOTIFICATION_CLIENTS=client_1,client_2

.gitignore

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+/vendor/
+.env
+.idea
+last_notification_date.txt

composer.json

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+{
+    "name": "kplaczek/foodsi-bot",
+    "description": "Foodsi bot. Integrating with homeassistant to provide push notifications and entity status.",
+    "require": {
+        "vlucas/phpdotenv": "^5.6",
+        "guzzlehttp/guzzle": "^7.9"
+    },
+    "autoload": {
+        "psr-4": {
+            "Kplaczek\\FoodsiBot\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Krzysztof Płaczek",
+            "email": "krzysztofplaczek@techtube.pl"
+        }
+    ]
+}

index.php

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+<?php
+
+use GuzzleHttp\Client;
+
+require_once 'vendor/autoload.php';
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
+$dotenv->load();
+$client = new Client();
+function send_notifications(Client $client, string $receiver, string $title, string $body): void
+{
+    $client->post(sprintf('%s/api/services/notify/%s', $_ENV['HOMEASSISTANT_URL'], $receiver), [
+        'headers' => ['Authorization' => 'Bearer ' . $_ENV['HOMEASSISTANT_TOKEN']],
+        'json' => ['message' => $body, 'title' => $title]
+    ]);
+}
+
+function update_homeassistent_entity(Client $client, array $package_info): void
+{
+    $client->post(sprintf('%s/api/states/sensor.foodsi_3kromki_large', $_ENV['HOMEASSISTANT_URL']), [
+        'headers' => ['Authorization' => 'Bearer ' . $_ENV['HOMEASSISTANT_TOKEN']],
+        'json' => ['state' => $package_info['current_quantity']]
+    ]);
+}
+
+function get_foodsie_package_info(Client $client): array
+{
+    $response = $client->post('https://api.foodsi.pl/api/v2/auth/sign_in', [
+        'json' => [
+            'email' => $_ENV['FOODSI_EMAIL'],
+            'password' => $_ENV['FOODSI_PASSWORD'],
+        ],
+    ]);
+    $response = $client->get(
+        'https://api.foodsi.pl/api/v3/user/offers?filter[venue_name][]=Trzy kromki chleba&filter[active]=true&filter[current_quantity][gt]=-1&filter[id]=6052730',
+        [
+            'headers' => [
+                'Access-Token' => $response->getHeader('Access-Token'),
+                'Client' => $response->getHeader('Client'),
+                'Uid' => $response->getHeader('Uid'),
+            ],
+        ],
+    );
+    $data = json_decode($response->getBody(), true);
+
+    return $data['data'][0]['attributes'];
+}
+
+$packageInfo = get_foodsie_package_info($client);
+$receivers = explode(',', $_ENV['HOMEASSISTANT_NOTIFICATION_CLIENTS']);
+$notificationSent = false;
+foreach ($receivers as $receiver) {
+    if (!file_exists('last_notification_date.txt')) {
+        touch('last_notification_date.txt');
+    }
+    $lastNotificationDate = file_get_contents('last_notification_date.txt');
+    if ($packageInfo['current_quantity'] > -1 && $lastNotificationDate !== date('Y-m-d')) {
+        send_notifications($client, $receiver, 'Dostępna paczka w 3 kromki chleba', sprintf('W trzech kromkach dostępne są paczki. Ilość: %s', $packageInfo['current_quantity']));
+        $notificationSent = true;
+    }
+}
+if ($notificationSent) {
+    file_put_contents('last_notification_date.txt', date('Y-m-d'));
+}
+update_homeassistent_entity($client, $packageInfo);