import json
import random
import time
from dataclasses import dataclass
from datetime import datetime, timezone
from typing import List

import requests
from loguru import logger

# Configure loguru logger
logger.add(
    "solana_transactions.log",
    rotation="500 MB",
    retention="10 days",
    level="INFO",
    format="{time} {level} {message}",
)

# Most reliable RPC endpoints
RPC_ENDPOINTS = [
    "https://api.mainnet-beta.solana.com",
    "https://rpc.ankr.com/solana",
    "https://solana.getblock.io/mainnet",
]


@dataclass
class TransactionError:
    """Data class to represent transaction errors"""

    error_type: str
    message: str
    timestamp: str = datetime.now(timezone.utc).isoformat()


class SolanaAPIException(Exception):
    """Custom exception for Solana API related errors"""

    pass


class RPCEndpointManager:
    """Manages RPC endpoints and handles switching between them"""

    def __init__(self, endpoints: List[str]):
        self.endpoints = endpoints.copy()
        self.current_endpoint = self.endpoints[0]
        self.last_request_time = 0
        self.min_request_interval = 0.2  # Increased minimum interval
        self.total_requests = 0
        self.max_requests_per_endpoint = 3

    def get_endpoint(self) -> str:
        """Get current endpoint with rate limiting"""
        now = time.time()
        time_since_last = now - self.last_request_time
        if time_since_last < self.min_request_interval:
            time.sleep(self.min_request_interval - time_since_last)

        self.total_requests += 1
        if self.total_requests >= self.max_requests_per_endpoint:
            self.switch_endpoint()
            self.total_requests = 0

        self.last_request_time = time.time()
        return self.current_endpoint

    def switch_endpoint(self) -> str:
        """Switch to next available endpoint"""
        current = self.current_endpoint
        available_endpoints = [ep for ep in self.endpoints if ep != current]

        if not available_endpoints:
            raise SolanaAPIException("All endpoints exhausted")

        self.current_endpoint = random.choice(available_endpoints)
        logger.info(f"Switched to endpoint: {self.current_endpoint}")
        return self.current_endpoint


def make_request(
    endpoint_manager: RPCEndpointManager,
    payload: dict,
    retry_count: int = 3,
) -> dict:
    """
    Makes a request with automatic endpoint switching and error handling.
    """
    last_error = None

    for attempt in range(retry_count):
        try:
            endpoint = endpoint_manager.get_endpoint()

            response = requests.post(
                endpoint,
                json=payload,
                timeout=10,
                headers={"Content-Type": "application/json"},
                verify=True,  # Ensure SSL verification
            )

            if response.status_code != 200:
                raise SolanaAPIException(
                    f"HTTP {response.status_code}: {response.text}"
                )

            data = response.json()

            if "error" in data:
                error_code = data["error"].get("code")
                if error_code == 429:  # Rate limit
                    logger.warning("Rate limit hit, switching endpoint...")
                    endpoint_manager.switch_endpoint()
                    time.sleep(2**attempt)  # Exponential backoff
                    continue

                if "message" in data["error"]:
                    raise SolanaAPIException(f"RPC error: {data['error']['message']}")

            return data

        except (
            requests.exceptions.SSLError,
            requests.exceptions.ConnectionError,
        ) as e:
            logger.warning(f"Connection error with {endpoint}: {str(e)}")
            endpoint_manager.switch_endpoint()
            continue

        except Exception as e:
            last_error = e
            logger.warning(f"Request failed: {str(e)}")
            endpoint_manager.switch_endpoint()
            time.sleep(1)
            continue

    raise SolanaAPIException(
        f"All retry attempts failed. Last error: {str(last_error)}"
    )


def fetch_wallet_transactions(wallet_address: str, max_transactions: int = 10) -> str:
    """
    Fetches recent transactions for a given Solana wallet address.

    Args:
        wallet_address (str): The Solana wallet address to fetch transactions for
        max_transactions (int, optional): Maximum number of transactions to fetch. Defaults to 10.

    Returns:
        str: JSON string containing transaction details
    """
    try:
        if not isinstance(wallet_address, str) or len(wallet_address) != 44:
            raise ValueError(f"Invalid Solana wallet address format: {wallet_address}")

        if not isinstance(max_transactions, int) or max_transactions < 1:
            raise ValueError("max_transactions must be a positive integer")

        logger.info(
            f"Fetching up to {max_transactions} transactions for wallet: {wallet_address}"
        )

        endpoint_manager = RPCEndpointManager(RPC_ENDPOINTS)

        # Get transaction signatures
        signatures_payload = {
            "jsonrpc": "2.0",
            "id": str(random.randint(1, 1000)),
            "method": "getSignaturesForAddress",
            "params": [wallet_address, {"limit": max_transactions}],
        }

        signatures_data = make_request(endpoint_manager, signatures_payload)

        transactions = signatures_data.get("result", [])
        if not transactions:
            logger.info("No transactions found for this wallet")
            return json.dumps(
                {
                    "success": True,
                    "transactions": [],
                    "error": None,
                    "transaction_count": 0,
                },
                indent=2,
            )

        logger.info(f"Found {len(transactions)} transactions")

        # Process transactions
        enriched_transactions = []
        for tx in transactions:
            try:
                tx_payload = {
                    "jsonrpc": "2.0",
                    "id": str(random.randint(1, 1000)),
                    "method": "getTransaction",
                    "params": [
                        tx["signature"],
                        {
                            "encoding": "json",
                            "maxSupportedTransactionVersion": 0,
                        },
                    ],
                }

                tx_data = make_request(endpoint_manager, tx_payload)

                if "result" in tx_data and tx_data["result"]:
                    result = tx_data["result"]
                    enriched_tx = {
                        "signature": tx["signature"],
                        "slot": tx["slot"],
                        "timestamp": tx.get("blockTime"),
                        "success": not tx.get("err"),
                    }

                    if "meta" in result:
                        enriched_tx["fee"] = result["meta"].get("fee")
                        if (
                            "preBalances" in result["meta"]
                            and "postBalances" in result["meta"]
                        ):
                            enriched_tx["balance_change"] = sum(
                                result["meta"]["postBalances"]
                            ) - sum(result["meta"]["preBalances"])

                    enriched_transactions.append(enriched_tx)
                    logger.info(f"Processed transaction {tx['signature'][:8]}...")

            except Exception as e:
                logger.warning(
                    f"Failed to process transaction {tx['signature']}: {str(e)}"
                )
                continue

        logger.info(f"Successfully processed {len(enriched_transactions)} transactions")

        return json.dumps(
            {
                "success": True,
                "transactions": enriched_transactions,
                "error": None,
                "transaction_count": len(enriched_transactions),
            },
            indent=2,
        )

    except Exception as e:
        error = TransactionError(error_type="API_ERROR", message=str(e))
        logger.error(f"Error: {error.message}")
        return json.dumps(
            {
                "success": False,
                "transactions": [],
                "error": error.__dict__,
                "transaction_count": 0,
            },
            indent=2,
        )


if __name__ == "__main__":
    # Example wallet address
    wallet = "CtBLg4AX6LQfKVtPPUWqJyQ5cRfHydUwuZZ87rmojA1P"

    try:
        result = fetch_wallet_transactions(wallet)
        print(result)
    except Exception as e:
        logger.error(f"Failed to fetch transactions: {str(e)}")
