Initial commit

services/geminiService.ts

@@ -0,0 +1,86 @@
+import { GoogleGenAI, Type } from "@google/genai";
+import { Quiz, Question, AnswerOption } from "../types";
+import { v4 as uuidv4 } from 'uuid';
+
+const getClient = () => {
+  const apiKey = process.env.API_KEY;
+  if (!apiKey) {
+    throw new Error("API_KEY environment variable is missing");
+  }
+  return new GoogleGenAI({ apiKey });
+};
+
+export const generateQuiz = async (topic: string): Promise<Quiz> => {
+  const ai = getClient();
+  
+  const prompt = `Generate a trivia quiz about "${topic}". Create 10 engaging multiple-choice questions. Each question must have exactly 4 options, and exactly one correct answer. Vary the difficulty.`;
+
+  const response = await ai.models.generateContent({
+    model: "gemini-3-flash-preview",
+    contents: prompt,
+    config: {
+      responseMimeType: "application/json",
+      responseSchema: {
+        type: Type.OBJECT,
+        properties: {
+          title: { type: Type.STRING, description: "A catchy title for the quiz" },
+          questions: {
+            type: Type.ARRAY,
+            items: {
+              type: Type.OBJECT,
+              properties: {
+                text: { type: Type.STRING, description: "The question text" },
+                options: {
+                  type: Type.ARRAY,
+                  items: {
+                    type: Type.OBJECT,
+                    properties: {
+                      text: { type: Type.STRING },
+                      isCorrect: { type: Type.BOOLEAN }
+                    },
+                    required: ["text", "isCorrect"]
+                  },
+                }
+              },
+              required: ["text", "options"]
+            }
+          }
+        },
+        required: ["title", "questions"]
+      }
+    }
+  });
+
+  if (!response.text) {
+    throw new Error("Failed to generate quiz content");
+  }
+
+  const data = JSON.parse(response.text);
+  
+  // Transform to our internal type with shapes/colors pre-assigned
+  const questions: Question[] = data.questions.map((q: any) => {
+    const shapes = ['triangle', 'diamond', 'circle', 'square'] as const;
+    const colors = ['red', 'blue', 'yellow', 'green'] as const;
+    
+    // Shuffle options so the correct one isn't always first (though Gemini usually randomizes, safety first)
+    // Actually, to map shapes consistently, let's keep array order but assign props
+    const options: AnswerOption[] = q.options.map((opt: any, index: number) => ({
+      text: opt.text,
+      isCorrect: opt.isCorrect,
+      shape: shapes[index % 4],
+      color: colors[index % 4]
+    }));
+
+    return {
+      id: uuidv4(),
+      text: q.text,
+      options: options,
+      timeLimit: 20
+    };
+  });
+
+  return {
+    title: data.title,
+    questions
+  };
+};