make web version work, add dockerfile

lib/api.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 import 'package:logging/logging.dart';
 import 'package:path_provider/path_provider.dart'; // For cache storage
@@ -21,10 +22,7 @@ class ApiClient {
       final response = await http.post(
         Uri.parse(url),
         headers: {'Content-Type': 'application/json'},
-        body: jsonEncode({
-          'email': username,
-          'password': password,
-        }),
+        body: jsonEncode({'email': username, 'password': password}),
       );
 
       if (response.statusCode == 200) {
@@ -59,7 +57,8 @@ class ApiClient {
         return response;
       } else {
         log.warning(
-            'GET request failed: ${response.statusCode} ${response.body}');
+          'GET request failed: ${response.statusCode} ${response.body}',
+        );
       }
     } catch (e) {
       log.warning('Error during GET request', e);
@@ -68,7 +67,9 @@ class ApiClient {
   }
 
   Future<http.Response?> post(
-      String endpoint, Map<String, dynamic> body) async {
+    String endpoint,
+    Map<String, dynamic> body,
+  ) async {
     try {
       final url = '$baseUrl$endpoint';
       final headers = {
@@ -86,7 +87,8 @@ class ApiClient {
         return response;
       } else {
         log.info(
-            'POST request failed: ${response.statusCode} ${response.body}');
+          'POST request failed: ${response.statusCode} ${response.body}',
+        );
       }
     } catch (e) {
       log.info('Error during POST request: $e');
@@ -112,7 +114,8 @@ class ApiClient {
         return response;
       } else {
         log.info(
-            'POST Form Data request failed: ${response.statusCode} ${response.body}');
+          'POST Form Data request failed: ${response.statusCode} ${response.body}',
+        );
       }
     } catch (e) {
       log.info('Error during POST Form Data request: $e');
@@ -135,7 +138,8 @@ class ApiClient {
             .toList();
       } else {
         log.warning(
-            'Failed to fetch sheets with status: ${response.statusCode}');
+          'Failed to fetch sheets with status: ${response.statusCode}',
+        );
         log.info('Response: ${response.body}');
       }
     } catch (e) {
@@ -145,6 +149,25 @@ class ApiClient {
     return List.empty();
   }
 
+  Future<Uint8List?> fetchPdfFileData(String sheetUuid) async {
+    try {
+      final response = await get('/sheet/pdf/$sheetUuid', isBinary: true);
+
+      if (response != null && response.statusCode == 200) {
+        log.info("PDF downloaded");
+        return response.bodyBytes;
+      } else {
+        log.warning(
+          "Failed to fetch PDF from API. Status: ${response?.statusCode}",
+        );
+      }
+    } catch (e) {
+      log.warning("Error fetching PDF", e);
+    }
+
+    return null;
+  }
+
   Future<File?> getPdfFileCached(String sheetUuid) async {
     try {
       final cacheDir = await getTemporaryDirectory();
@@ -156,16 +179,11 @@ class ApiClient {
         return cachedFile;
       }
 
-      final response = await get('/sheet/pdf/$sheetUuid', isBinary: true);
-
-      if (response != null && response.statusCode == 200) {
-        await cachedFile.writeAsBytes(response.bodyBytes);
-        log.info("PDF downloaded and cached at: $cachedPdfPath");
-        return cachedFile;
-      } else {
-        log.warning(
-            "Failed to fetch PDF from API. Status: ${response?.statusCode}");
-      }
+      final pdfFileData = await fetchPdfFileData(sheetUuid);
+      await cachedFile.writeAsBytes(
+        pdfFileData!,
+      ); // TODO: proper error handling
+      log.info("PDF cached at: $cachedPdfPath");
     } catch (e) {
       log.warning("Error fetching PDF", e);
     }