elCaribe app - customization and branding

news-app/lib/ui/screens/AddEditNews/Widgets/geminiService.dart

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+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'package:news/utils/api.dart';
+
+/// AI Service Module using Google Gemini API
+/// This module contains all AI-related API calls for the application
+
+class GeminiService {
+  static const String _geminiModel = "gemini-2.0-flash"; // Or gemini-1.5-pro
+
+  /// Helper function to call Gemini API
+  static Future<Map<String, dynamic>> _callGeminiAPI(String prompt, String apiKey) async {
+    try {
+      final requestBody = {
+        "contents": [
+          {
+            "parts": [
+              {"text": prompt}
+            ]
+          }
+        ]
+      };
+
+      final url = Uri.parse("${Api.geminiMetaInfoApi}$_geminiModel:generateContent?key=$apiKey");
+
+      final response = await http.post(
+        url,
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode(requestBody),
+      );
+
+      if (response.statusCode != 200) {
+        final errorData = jsonDecode(response.body);
+        throw Exception(errorData["error"]?["message"] ?? "Failed to generate content");
+      }
+
+      return jsonDecode(response.body);
+    } catch (e) {
+      rethrow;
+    }
+  }
+
+  /// Generate content
+  static Future<String> generateContent({
+    String? title,
+    String? category,
+    String? language,
+    String? languageCode,
+    required String apiKey,
+  }) async {
+    try {
+      String fullPrompt = "You are a skilled news article writer. Create engaging and informative content.";
+
+      if (title != null) {
+        fullPrompt += "\n\nWrite an article with the title: \"$title\"";
+      }
+
+      if (category != null) {
+        fullPrompt += "\nCategory: $category";
+      }
+
+      if (language != null && languageCode != null) {
+        fullPrompt += "\n\nIMPORTANT: Generate all content in $language language ($languageCode). The response MUST be in $language.";
+      }
+
+      fullPrompt += "\n\nRequest: \n\nArticle:";
+ 
+      final response = await _callGeminiAPI(fullPrompt, apiKey);
+
+      return response["candidates"][0]["content"]["parts"][0]["text"];
+    } catch (e) {
+      rethrow;
+    }
+  }
+
+  /// Generate meta info
+  static Future<Map<String, dynamic>> generateMetaInfo({required String title, String? language, String? languageCode, required String apiKey}) async {
+    try {
+      String languageInstruction = "";
+      if (language != null && languageCode != null) {
+        languageInstruction = "\n\nIMPORTANT: Generate all content in $language language ($languageCode). The response MUST be in same language as title.";
+      }
+
+      final prompt = """
+You are an SEO expert. Generate meta title, description, keywords, and a slug for this news article titled: "$title".$languageInstruction
+
+Return ONLY a JSON object with these fields:
+- meta_title
+- meta_description
+- meta_keywords
+- slug
+
+Response must be valid JSON.
+""";
+
+      final response = await _callGeminiAPI(prompt, apiKey);
+      final responseText = response["candidates"][0]["content"]["parts"][0]["text"].trim();
+
+      try {
+        return jsonDecode(responseText);
+      } catch (_) {
+        final match = RegExp(r"\{[\s\S]*\}").firstMatch(responseText);
+        if (match != null) {
+          return jsonDecode(match.group(0)!);
+        }
+        return {
+          "meta_title": title,
+          "meta_description": "Read about $title in our latest news article.",
+          "meta_keywords": title.toLowerCase().split(" ").join(","),
+          "slug": title.toLowerCase().replaceAll(RegExp(r'[^a-z0-9]+'), "-").replaceAll(RegExp(r'^-|-$'), ""),
+        };
+      }
+    } catch (e) {
+      rethrow;
+    }
+  }
+
+  /// Summarize description
+  static Future<String> summarizeDescription(String description, String apiKey, {String language = "English", String languageCode = "en"}) async {
+    try {
+      if (description.trim().isEmpty) return "";
+
+      final cleanContent = description.replaceAll(RegExp(r"<[^>]*>"), "").trim();
+      if (cleanContent.isEmpty) return "";
+
+      final prompt = """
+You are a skilled content summarizer. Summarize the following news content:
+
+Content: "$cleanContent"
+
+Instructions:
+- 200-250 words
+- Maintain key facts
+- Professional news style
+- No explanations, only summary
+- IMPORTANT: Generate in $language ($languageCode).
+
+Summary:""";
+
+      final response = await _callGeminiAPI(prompt, apiKey);
+      final summary = response["candidates"][0]["content"]["parts"][0]["text"].trim();
+
+      String finalSummary = summary.replaceAll(RegExp(r"^['\']+|['\']+$"), '').trim();
+      return finalSummary;
+    } catch (e) {
+      return description.replaceAll(RegExp(r"<[^>]*>"), "").substring(0, 150) + "...";
+    }
+  }
+}