#!/usr/bin/env python3
"""
Whale Tracking Router
GET /api/whales/transactions, GET /api/whales/activity
"""

from fastapi import APIRouter, HTTPException, Query
from fastapi.responses import JSONResponse
from typing import Optional, List, Dict, Any
from datetime import datetime, timezone, timedelta
import logging

from backend.services.provider_fallback_manager import fallback_manager
from backend.services.data_resolver import get_data_resolver
from backend.services.persistence_service import PersistenceService
from database.db_manager import db_manager

logger = logging.getLogger(__name__)

router = APIRouter(
    prefix="/api/whales",
    tags=["Whale Tracking"]
)

persistence_service = PersistenceService()


def create_response(data: Any, source: str, attempted: List[str] = None) -> Dict[str, Any]:
    """Create standardized response"""
    return {
        "data": data,
        "meta": {
            "source": source,
            "generated_at": datetime.now(timezone.utc).isoformat(),
            "cache_ttl": 60,
            "attempted": attempted or [source]
        }
    }


@router.get("/transactions")
async def get_whale_transactions(
    limit: int = Query(50, description="Number of transactions"),
    chain: Optional[str] = Query(None, description="Blockchain (ethereum, bsc, tron)"),
    min_amount_usd: Optional[float] = Query(100000, description="Minimum amount in USD")
):
    """Get whale transactions"""
    attempted = []
    
    # Try database first
    try:
        transactions = await persistence_service.get_whale_transactions(
            limit=limit,
            chain=chain,
            min_amount=min_amount_usd
        )
        if transactions:
            attempted.append("database")
            return create_response(transactions, "database", attempted)
    except Exception as e:
        logger.warning(f"Database query failed: {e}")
        attempted.append("database")
    
    # Try HF Space
    try:
        resolver = await get_data_resolver()
        whale_data = await resolver.resolve_whale_transactions(limit=limit, chain=chain)
        if whale_data:
            attempted.append("hf")
            # Save to database
            await persistence_service.save_whale_transactions(whale_data)
            return create_response(whale_data, "hf", attempted)
    except Exception as e:
        logger.warning(f"HF Space unavailable: {e}")
        attempted.append("hf")
    
    # Fallback to external APIs
    try:
        result = await fallback_manager.fetch_with_fallback(
            endpoint="/whale/transactions",
            params={"limit": limit, "chain": chain or "ethereum"},
            transform_func=lambda x: x if isinstance(x, list) else []
        )
        attempted.extend(result.attempted)
        if result.success and result.data:
            # Filter by min_amount
            filtered = [
                tx for tx in result.data
                if tx.get("amount_usd", 0) >= min_amount_usd
            ]
            await persistence_service.save_whale_transactions(filtered)
            return create_response(filtered[:limit], result.source, attempted)
    except Exception as e:
        logger.error(f"External APIs failed: {e}")
        attempted.append("external_apis")
    
    # Return empty with attempted sources
    return create_response([], "none", attempted)


@router.get("/activity")
async def get_whale_activity(
    hours: int = Query(24, description="Hours to look back")
):
    """Get whale activity statistics"""
    attempted = []
    
    # Try database
    try:
        since = datetime.now(timezone.utc) - timedelta(hours=hours)
        activity = await persistence_service.get_whale_activity_stats(since)
        if activity:
            attempted.append("database")
            return create_response(activity, "database", attempted)
    except Exception as e:
        logger.warning(f"Database query failed: {e}")
        attempted.append("database")
    
    # Try HF Space
    try:
        resolver = await get_data_resolver()
        activity = await resolver.resolve_whale_activity(hours=hours)
        if activity:
            attempted.append("hf")
            return create_response(activity, "hf", attempted)
    except Exception as e:
        logger.warning(f"HF Space unavailable: {e}")
        attempted.append("hf")
    
    # Fallback to external
    try:
        result = await fallback_manager.fetch_with_fallback(
            endpoint="/whale/stats",
            params={"hours": hours},
            transform_func=lambda x: x if isinstance(x, dict) else {}
        )
        attempted.extend(result.attempted)
        if result.success:
            return create_response(result.data, result.source, attempted)
    except Exception as e:
        logger.error(f"External APIs failed: {e}")
        attempted.append("external_apis")
    
    # Return default stats
    default_stats = {
        "total_transactions": 0,
        "total_volume_usd": 0,
        "top_chains": [],
        "period_hours": hours
    }
    return create_response(default_stats, "default", attempted)