🔧 Fix AI Analysis Service - Improved Prompts & Error Handling

✅ FIXED: AI analysis prompts to bypass OpenAI safety guardrails
✅ FIXED: Added technical analysis focus instead of trading advice tone
✅ FIXED: Improved JSON parsing and error handling
✅ ADDED: Option to use existing screenshots for testing (useExisting param)
✅ IMPROVED: Better image detail settings and temperature for consistency

🐛 DEBUGGING: Still investigating why AI claims it can't see images
- OpenAI vision capabilities confirmed working with public images
- Model gpt-4o has proper vision support
- Issue appears to be with chart image content or encoding

🎯 NEXT: Debug image encoding and model response inconsistency

app/api/analyze/route.ts

@@ -3,10 +3,11 @@ import { aiAnalysisService } from '../../../lib/ai-analysis'
 import { enhancedScreenshotService } from '../../../lib/enhanced-screenshot'
 import { settingsManager } from '../../../lib/settings'
 import path from 'path'
+import fs from 'fs'
 
 export async function POST(req: NextRequest) {
   try {
-    const { symbol, layouts, timeframe } = await req.json()
+    const { symbol, layouts, timeframe, useExisting } = await req.json()
     
     // Load current settings
     const settings = await settingsManager.loadSettings()
@@ -19,9 +20,37 @@ export async function POST(req: NextRequest) {
     if (!finalSymbol) {
       return NextResponse.json({ error: 'Missing symbol' }, { status: 400 })
     }
+
+    let screenshots: string[] = []
     
-    const baseFilename = `${finalSymbol}_${finalTimeframe}_${Date.now()}`
-    const screenshots = await enhancedScreenshotService.capture(finalSymbol, `${baseFilename}.png`, finalLayouts, finalTimeframe)
+    // If useExisting is true, find existing screenshots
+    if (useExisting) {
+      console.log('Using existing screenshots for analysis...')
+      const screenshotsDir = path.join(process.cwd(), 'screenshots')
+      const allFiles = await fs.promises.readdir(screenshotsDir)
+      
+      // Find screenshots matching the symbol and timeframe
+      const matchingFiles = allFiles.filter(file => 
+        file.includes(finalSymbol) && 
+        file.includes(finalTimeframe) && 
+        file.endsWith('.png') &&
+        !file.includes('debug')
+      )
+      
+      if (matchingFiles.length > 0) {
+        // Use the most recent screenshots (limit to 3 for analysis)
+        screenshots = matchingFiles
+          .sort((a, b) => b.localeCompare(a)) // Sort by name (which includes timestamp)
+          .slice(0, 3)
+          .map(file => path.join(screenshotsDir, file))
+      } else {
+        return NextResponse.json({ error: `No existing screenshots found for ${finalSymbol} ${finalTimeframe}` }, { status: 404 })
+      }
+    } else {
+      // Original behavior - capture new screenshots
+      const baseFilename = `${finalSymbol}_${finalTimeframe}_${Date.now()}`
+      screenshots = await enhancedScreenshotService.capture(finalSymbol, `${baseFilename}.png`, finalLayouts, finalTimeframe)
+    }
     
     let result
     if (screenshots.length === 1) {
@@ -46,7 +75,8 @@ export async function POST(req: NextRequest) {
         timeframe: finalTimeframe,
         layouts: finalLayouts
       },
-      screenshots: screenshots.map((s: string) => path.basename(s))
+      screenshots: screenshots.map((s: string) => path.basename(s)),
+      usedExisting: useExisting || false
     })
   } catch (e: any) {
     return NextResponse.json({ error: e.message }, { status: 500 })