Fix AI OCR JSON parsing issues

🐛 JSON Parsing Fixes:
- Handle markdown code blocks in AI responses
- Add robust text extraction fallback when JSON parsing fails
- Improve AI prompt to request plain JSON without formatting
- Add extractDataFromRawResponse method for text parsing
- Better error handling and logging for debugging

This should fix the issue where AI returns markdown formatted responses
instead of proper card data extraction.

src/services/aiOcr.ts

@@ -46,23 +46,7 @@ class AICardOCR {
               content: [
                 {
                   type: 'text',
-                  text: `Analyze this trading card image and extract the following information in JSON format:
-
-{
-  "cardName": "exact card name",
-  "setName": "set name if visible", 
-  "setCode": "3-4 letter set code if visible",
-  "cardType": "creature, spell, pokemon, etc",
-  "rarity": "common, uncommon, rare, etc",
-  "hp": "HP value for Pokemon",
-  "attacks": ["attack names"],
-  "abilities": ["ability names"],
-  "rawText": "all visible text on the card",
-  "game": "MTG or POKEMON or LORCANA",
-  "confidence": 95
-}
-
-Focus on accuracy. If you can't clearly read something, leave it empty rather than guessing.`
+                  text: 'Analyze this trading card image and extract information. Respond with ONLY valid JSON, no markdown formatting or code blocks:\n\n{"cardName": "exact card name", "setName": "set name if visible", "setCode": "3-4 letter set code if visible", "cardType": "creature, spell, pokemon, etc", "rarity": "common, uncommon, rare, etc", "hp": "HP value for Pokemon", "attacks": ["attack names"], "abilities": ["ability names"], "rawText": "all visible text on the card", "game": "MTG or POKEMON or LORCANA", "confidence": 95}\n\nIMPORTANT: Return ONLY the JSON object, no markdown code blocks. Focus on accuracy, leave fields empty if unclear. For the cardName, use the exact name as printed on the card.'
                 },
                 {
                   type: 'image_url',
@@ -90,9 +74,17 @@ Focus on accuracy. If you can't clearly read something, leave it empty rather th
         throw new Error('No content received from OpenAI');
       }
 
-      // Parse JSON response
+      // Clean and parse JSON response
       try {
-        const result = JSON.parse(content);
+        // Remove markdown code blocks if present
+        let cleanContent = content.trim();
+        if (cleanContent.startsWith('```json')) {
+          cleanContent = cleanContent.replace(/^```json\s*/, '').replace(/\s*```$/, '');
+        } else if (cleanContent.startsWith('```')) {
+          cleanContent = cleanContent.replace(/^```\s*/, '').replace(/\s*```$/, '');
+        }
+        
+        const result = JSON.parse(cleanContent);
         return {
           cardName: result.cardName || '',
           setName: result.setName || undefined,
@@ -107,12 +99,23 @@ Focus on accuracy. If you can't clearly read something, leave it empty rather th
           game: result.game || 'UNKNOWN'
         };
       } catch (parseError) {
-        // If JSON parsing fails, treat the whole response as raw text
+        console.log('JSON parsing failed, trying text extraction:', parseError);
+        console.log('Raw content:', content);
+        
+        // If JSON parsing fails, try to extract data from the raw text
+        const extractedData = this.extractDataFromRawResponse(content);
         return {
-          cardName: this.extractCardNameFromText(content),
+          cardName: extractedData.cardName || 'Unknown Card',
+          setName: extractedData.setName,
+          setCode: extractedData.setCode,
+          cardType: extractedData.cardType,
+          rarity: extractedData.rarity,
+          hp: extractedData.hp,
+          attacks: extractedData.attacks || [],
+          abilities: extractedData.abilities || [],
           rawText: content,
           confidence: 70,
-          game: this.detectGameFromText(content)
+          game: extractedData.game || 'UNKNOWN'
         };
       }
 
@@ -138,6 +141,57 @@ Focus on accuracy. If you can't clearly read something, leave it empty rather th
     return lines[0] || 'Unknown Card';
   }
 
+  // Extract data from raw AI response when JSON parsing fails
+  private extractDataFromRawResponse(text: string): Partial<CardOCRResult> {
+    const lines = text.split('\n').map(line => line.trim()).filter(line => line.length > 0);
+    
+    let cardName = '';
+    let setName = '';
+    let setCode = '';
+    let cardType = '';
+    let rarity = '';
+    let hp = '';
+    let attacks: string[] = [];
+    let abilities: string[] = [];
+    
+    for (const line of lines) {
+      // Skip markdown and formatting
+      if (line.startsWith('```') || line.startsWith('#')) continue;
+      
+      // Look for key-value patterns
+      if (line.match(/card\s*name[:\-]?\s*(.+)/i)) {
+        cardName = line.replace(/card\s*name[:\-]?\s*/i, '').replace(/['"]/g, '');
+      } else if (line.match(/name[:\-]?\s*(.+)/i) && !cardName) {
+        cardName = line.replace(/name[:\-]?\s*/i, '').replace(/['"]/g, '');
+      } else if (line.match(/set[:\-]?\s*(.+)/i)) {
+        setName = line.replace(/set[:\-]?\s*/i, '').replace(/['"]/g, '');
+      } else if (line.match(/hp[:\-]?\s*(\d+)/i)) {
+        hp = line.match(/hp[:\-]?\s*(\d+)/i)?.[1] || '';
+      } else if (line.match(/type[:\-]?\s*(.+)/i)) {
+        cardType = line.replace(/type[:\-]?\s*/i, '').replace(/['"]/g, '');
+      } else if (line.match(/rarity[:\-]?\s*(.+)/i)) {
+        rarity = line.replace(/rarity[:\-]?\s*/i, '').replace(/['"]/g, '');
+      }
+    }
+    
+    // If no structured data found, use the first substantial line as card name
+    if (!cardName) {
+      cardName = this.extractCardNameFromText(text);
+    }
+    
+    return {
+      cardName: cardName || 'Unknown Card',
+      setName: setName || undefined,
+      setCode: setCode || undefined,
+      cardType: cardType || undefined,
+      rarity: rarity || undefined,
+      hp: hp || undefined,
+      attacks: attacks.length > 0 ? attacks : undefined,
+      abilities: abilities.length > 0 ? abilities : undefined,
+      game: this.detectGameFromText(text)
+    };
+  }
+
   // Detect game type from text
   private detectGameFromText(text: string): 'MTG' | 'POKEMON' | 'LORCANA' | 'UNKNOWN' {
     const lowerText = text.toLowerCase();