From dea3f1bd6778c59cf42cf3434a1d0d71cd41ec39 Mon Sep 17 00:00:00 2001
From: NaiJi <naijiworld@protonmail.com>
Date: Tue, 31 Jan 2023 10:40:30 +0400
Subject: [PATCH] feat: Implement flexible args parsing

---
 bin/main.dart                  |   9 ++-
 lib/parsing/parser.dart        | 125 +++++++++++++++++++++++++++++++++
 lib/parsing/parsing_stage.dart |   8 +++
 3 files changed, 137 insertions(+), 5 deletions(-)
 create mode 100644 lib/parsing/parser.dart
 create mode 100644 lib/parsing/parsing_stage.dart

diff --git a/bin/main.dart b/bin/main.dart
index 8d21919..a26f977 100644
--- a/bin/main.dart
+++ b/bin/main.dart
@@ -2,15 +2,14 @@ import 'dart:core';
 
 import 'package:funkblubber/funkblubber.dart' as funkblubber;
 import 'package:funkblubber/console.dart' as console;
-import 'package:funkblubber/funkentity.dart';
-import 'package:funkblubber/parser.dart' as parser;
+import 'package:funkblubber/parsing/parser.dart' as parser;
 
 void main(final List<String> arguments) async {
-  final object = parser.extract(arguments);
-  if (object.kind == FunkEntity.error) {
+  final result = parser.extract(arguments);
+  if (!result.success) {
     console.error("'funkblubber --help 'for more");
     return;
   }
 
-  await funkblubber.download(object: object);
+  await funkblubber.download(object: result.object!);
 }
diff --git a/lib/parsing/parser.dart b/lib/parsing/parser.dart
new file mode 100644
index 0000000..7960001
--- /dev/null
+++ b/lib/parsing/parser.dart
@@ -0,0 +1,125 @@
+import 'package:funkblubber/funkentity.dart';
+import 'package:funkblubber/console.dart' as console;
+import 'package:funkblubber/parsing/parsing_stage.dart';
+
+enum Action {
+  download,
+  upload,
+}
+
+class StageResult {
+  StageResult({required this.result, required this.stage});
+  final ParseResult result;
+  final ParsingStage stage;
+}
+
+class ParseResult {
+  ParseResult({
+    required this.success,
+    required this.action,
+    this.object,
+    this.localPath,
+  });
+
+  final FunkObject? object;
+  final String? localPath;
+  final Action action;
+  final bool success;
+}
+
+ParseResult extract(final List<String> args) {
+  ParseResult result = ParseResult(
+    success: false,
+    action: Action.download,
+  );
+
+  if (args.isEmpty) {
+    console.error('no arguments provided');
+    return result;
+  }
+
+  ParsingStage currentStage = ParsingStage.nothing;
+
+  for (final String arg in args) {
+    switch (currentStage) {
+      case ParsingStage.nothing:
+        final stageResult = _onNothingStage(arg, result, currentStage);
+        currentStage = stageResult.stage;
+        result = stageResult.result;
+        break;
+      default:
+        console.error('not implemented yet');
+        break;
+    }
+  }
+
+  return result;
+}
+
+StageResult _onNothingStage(
+  final String arg,
+  final ParseResult previousResult,
+  final ParsingStage previousStage,
+) {
+  ParsingStage currentStage = previousStage;
+  ParseResult result = previousResult;
+  switch (arg) {
+    case '-A':
+    case '--artist':
+      currentStage = ParsingStage.artist;
+      break;
+    case '-a':
+    case '--album':
+      currentStage = ParsingStage.album;
+      break;
+    case '-u':
+    case '--upload':
+      currentStage = ParsingStage.upload;
+      break;
+    case '-p':
+    case '--path':
+      currentStage = ParsingStage.path;
+      break;
+    default:
+      try {
+        final Uri uri = Uri.parse(arg);
+
+        final segments = uri.pathSegments;
+        for (int i = 0; i < segments.length; ++i) {
+          switch (segments[i]) {
+            case 'artists':
+              result = ParseResult(
+                action: Action.download,
+                success: true,
+                object: FunkObject(
+                  kind: FunkEntity.artist,
+                  id: segments[i + 1],
+                  domain: uri.host,
+                ),
+              );
+              ++i;
+              break;
+
+            case 'albums':
+              result = ParseResult(
+                action: Action.download,
+                success: true,
+                object: FunkObject(
+                  kind: FunkEntity.album,
+                  id: segments[i + 1],
+                  domain: uri.host,
+                ),
+              );
+              ++i;
+              break;
+          }
+        }
+      } catch (e) {
+        console.error(e.toString());
+        currentStage = ParsingStage.nothing;
+      }
+      break;
+  }
+
+  return StageResult(result: result, stage: currentStage);
+}
diff --git a/lib/parsing/parsing_stage.dart b/lib/parsing/parsing_stage.dart
new file mode 100644
index 0000000..706b41d
--- /dev/null
+++ b/lib/parsing/parsing_stage.dart
@@ -0,0 +1,8 @@
+enum ParsingStage {
+  nothing,
+  album,
+  artist,
+  song,
+  path,
+  upload,
+}