"""
bitcoin_rpc.py — Facade that selects regtest or testnet backend
based on config.ini [bitcoin] network setting.

Exposes:
    NETWORK       – "regtest" or "testnet"
    IS_REGTEST    – True when running on regtest
    cli(...)      – RPC call routed to the correct backend
    mine_blocks, get_tx, get_utxos, get_balance, send_raw, ...
"""

import json
import time
import os
import configparser

# ── Load config ──────────────────────────────────────────────────────────────

def _load_config():
    cfg = configparser.ConfigParser()
    config_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "config.ini")
    cfg.read(config_path)
    return cfg["bitcoin"] if "bitcoin" in cfg else {}

_cfg = _load_config()
NETWORK = _cfg.get("network", "regtest").strip().lower()
IS_REGTEST = NETWORK == "regtest"

# ── Select the right cli backend ─────────────────────────────────────────────

if IS_REGTEST:
    from lib.clis import cli_regtest as _cli_backend
else:
    from lib.clis import cli_testnet as _cli_backend


def cli(*args, wallet=None):
    """Route RPC calls to the active backend."""
    return _cli_backend(*args, wallet=wallet)


# ── Block mining (regtest only) ──────────────────────────────────────────────

def mine_blocks(n=1):
    """Mine n blocks. Only works on regtest; no-op on testnet."""
    if not IS_REGTEST:
        # On testnet we cannot mine — just wait for propagation
        time.sleep(2)
        return get_block_count()
    miner_addr = cli("getnewaddress", "", "bech32", wallet="miner")
    cli("generatetoaddress", n, miner_addr)
    return int(cli("getblockcount"))


def fund_wallet(wallet_name, amount=1.0, from_wallet="miner"):
    """Send `amount` BTC from `from_wallet` to a new address in `wallet_name`."""
    addr = cli("getnewaddress", "", "bech32", wallet=wallet_name)
    txid = cli("sendtoaddress", addr, f"{amount:.8f}", wallet=from_wallet)
    return txid, addr


def wait_for_mempool_empty(timeout=60):
    """Wait until mempool is empty (all txs mined)."""
    for _ in range(timeout * 2):
        info = cli("getmempoolinfo")
        if info["size"] == 0:
            return True
        time.sleep(0.5)
    return False


def get_tx(txid):
    """Get decoded transaction."""
    return cli("getrawtransaction", txid, "true")


def get_utxos(wallet_name, min_conf=0):
    """List unspent outputs for a wallet."""
    return cli("listunspent", min_conf, wallet=wallet_name)


def get_balance(wallet_name):
    """Get wallet balance."""
    return float(cli("getbalance", wallet=wallet_name))


def send_raw(hex_tx):
    """Broadcast a raw transaction."""
    return cli("sendrawtransaction", hex_tx)


def create_funded_psbt(wallet_name, inputs, outputs, options=None):
    """Create a funded PSBT."""
    args = ["walletcreatefundedpsbt", json.dumps(inputs), json.dumps(outputs), 0]
    if options:
        args.append(json.dumps(options))
    return cli(*args, wallet=wallet_name)


def process_psbt(wallet_name, psbt):
    """Sign a PSBT."""
    return cli("walletprocesspsbt", psbt, wallet=wallet_name)


def finalize_psbt(psbt):
    """Finalize a PSBT."""
    return cli("finalizepsbt", psbt)


def decode_psbt(psbt):
    """Decode a PSBT."""
    return cli("decodepsbt", psbt)


def create_raw_tx(inputs, outputs):
    """Create a raw transaction."""
    return cli("createrawtransaction", json.dumps(inputs), json.dumps(outputs))


def sign_raw_tx(wallet_name, hex_tx):
    """Sign a raw transaction."""
    return cli("signrawtransactionwithwallet", hex_tx, wallet=wallet_name)


def decode_raw_tx(hex_tx):
    """Decode a raw transaction."""
    return cli("decoderawtransaction", hex_tx)


def get_block_count():
    """Get current block height."""
    return int(cli("getblockcount"))


def get_new_address(wallet_name, addr_type="bech32"):
    """Get a new address."""
    return cli("getnewaddress", "", addr_type, wallet=wallet_name)


def send_to_address(wallet_name, address, amount):
    """Send BTC to an address."""
    print(f"Sending {amount:.8f} BTC from {wallet_name} to {address}...")
    return cli("sendtoaddress", address, f"{amount:.8f}", wallet=wallet_name)


if __name__ == "__main__":
    print(f"Network mode: {NETWORK} (IS_REGTEST={IS_REGTEST})")
    print("Testing RPC connection...")
    info = cli("getblockchaininfo")
    print(f"  Chain: {info['chain']}")
    print(f"  Blocks: {info['blocks']}")

    for w in ["miner", "alice", "bob", "carol", "exchange", "risky"]:
        try:
            bal = get_balance(w)
            print(f"  {w}: {bal} BTC")
        except Exception as e:
            print(f"  {w}: ERROR - {e}")