from fastapi import APIRouter, HTTPException, Depends, UploadFile, File
from pydantic import BaseModel
from typing import List, Optional
from datetime import datetime
import base64
import io

from app import verify_token, db_service, skin_model, tone_analyzer

router = APIRouter()

class AnalysisRequest(BaseModel):
    image_base64: Optional[str] = None
    conditions: Optional[List[str]] = []
    user_id: str

class AnalysisResponse(BaseModel):
    id: str
    conditions: List[dict]
    pins: List[dict]
    skin_tone: dict
    recommendations: dict
    dermatologist_warning: bool
    disclaimer: str

@router.post("/analyze-skin", response_model=AnalysisResponse)
async def analyze_skin(
    request: AnalysisRequest,
    user_id: str = Depends(verify_token)
):
    """
    Analyze skin from image or manual condition selection
    """
    try:
        analysis_id = f"analysis_{datetime.utcnow().timestamp()}"
        
        # Initialize response
        response = {
            'id': analysis_id,
            'conditions': [],
            'pins': [],
            'skin_tone': {},
            'recommendations': {},
            'dermatologist_warning': False,
            'disclaimer': "These results are AI-generated. We recommend consulting a dermatologist or researching your skin condition to ensure accuracy."
        }
        
        # Process image if provided
        if request.image_base64:
            # Decode image
            image_bytes = base64.b64decode(request.image_base64)
            
            # Analyze skin conditions
            analysis = skin_model.analyze_skin(image_bytes)
            
            if 'error' in analysis:
                raise HTTPException(status_code=400, detail=analysis['error'])
            
            # Analyze skin tone
            skin_tone = tone_analyzer.analyze_skin_tone(image_bytes)
            
            response['conditions'] = analysis.get('conditions', [])
            response['pins'] = analysis.get('pins', [])
            response['skin_tone'] = skin_tone
            response['dermatologist_warning'] = analysis.get('dermatologist_warning', False)
            
            # Delete image after analysis (GDPR compliance)
            # Image is already in memory, no need to delete
            
        elif request.conditions:
            # Manual condition selection
            response['conditions'] = [
                {'condition': c, 'severity': 'mild', 'confidence': 0}
                for c in request.conditions
            ]
        
        # Generate recommendations
        from models.cosmetics_matcher import CosmeticMatcher
        matcher = CosmeticMatcher()
        
        recommendations = matcher.find_matches(
            skin_tone=response['skin_tone'],
            conditions=response['conditions']
        )
        
        response['recommendations'] = recommendations
        
        # Save to database
        db_service.save_analysis(
            user_id=user_id,
            analysis_id=analysis_id,
            data=response
        )
        
        return response
        
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@router.post("/update-pins")
async def update_analysis_pins(
    analysis_id: str,
    pins: List[dict],
    user_id: str = Depends(verify_token)
):
    """
    Update analysis based on user-modified pins
    """
    try:
        # Get existing analysis
        analysis = db_service.get_analysis(analysis_id, user_id)
        
        if not analysis:
            raise HTTPException(status_code=404, detail="Analysis not found")
        
        # Update pins
        analysis['pins'] = pins
        
        # Extract conditions from pins
        conditions = [
            {
                'condition': pin['condition'],
                'severity': pin.get('severity', 'mild'),
                'confidence': pin.get('confidence', 0),
                'position': pin.get('position')
            }
            for pin in pins
        ]
        
        analysis['conditions'] = conditions
        
        # Regenerate recommendations
        from models.cosmetics_matcher import CosmeticMatcher
        matcher = CosmeticMatcher()
        
        recommendations = matcher.find_matches(
            skin_tone=analysis['skin_tone'],
            conditions=conditions
        )
        
        analysis['recommendations'] = recommendations
        analysis['updated_at'] = datetime.utcnow().isoformat()
        analysis['user_modified'] = True
        
        # Save to database
        db_service.update_analysis(analysis_id, user_id, analysis)
        
        # Log privacy action
        db_service.log_privacy_action({
            'user_id': user_id,
            'action': 'analysis_modified',
            'details': f'User modified {len(pins)} pins',
            'timestamp': datetime.utcnow().isoformat()
        })
        
        return analysis
        
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@router.get("/history")
async def get_analysis_history(
    limit: int = 10,
    user_id: str = Depends(verify_token)
):
    """
    Get user's analysis history
    """
    try:
        history = db_service.get_user_analyses(user_id, limit)
        return {"history": history}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@router.get("/{analysis_id}")
async def get_analysis(
    analysis_id: str,
    user_id: str = Depends(verify_token)
):
    """
    Get specific analysis by ID
    """
    try:
        analysis = db_service.get_analysis(analysis_id, user_id)
        if not analysis:
            raise HTTPException(status_code=404, detail="Analysis not found")
        return analysis
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@router.delete("/{analysis_id}")
async def delete_analysis(
    analysis_id: str,
    user_id: str = Depends(verify_token)
):
    """
    Delete analysis (GDPR compliance)
    """
    try:
        db_service.delete_analysis(analysis_id, user_id)
        return {"message": "Analysis deleted successfully"}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))