#!/usr/bin/env python3
# Copyright (c) 2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test the send RPC command."""

from decimal import Decimal, getcontext
from itertools import product

from test_framework.authproxy import JSONRPCException
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    assert_fee_amount,
    assert_greater_than,
    assert_raises_rpc_error,
)

class WalletSendTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 2
        # whitelist all peers to speed up tx relay / mempool sync
        self.extra_args = [
            ["-whitelist=127.0.0.1","-walletrbf=1"],
            ["-whitelist=127.0.0.1","-walletrbf=1"],
        ]
        getcontext().prec = 8 # Satoshi precision for Decimal

    def skip_test_if_missing_module(self):
        self.skip_if_no_wallet()

    def test_send(self, from_wallet, to_wallet=None, amount=None, data=None,
                  arg_conf_target=None, arg_estimate_mode=None, arg_fee_rate=None,
                  conf_target=None, estimate_mode=None, fee_rate=None, add_to_wallet=None, psbt=None,
                  inputs=None, add_inputs=None, change_address=None, change_position=None, change_type=None,
                  include_watching=None, locktime=None, lock_unspents=None, replaceable=None, subtract_fee_from_outputs=None,
                  expect_error=None):
        assert (amount is None) != (data is None)

        from_balance_before = from_wallet.getbalance()
        if to_wallet is None:
            assert amount is None
        else:
            to_untrusted_pending_before = to_wallet.getbalances()["mine"]["untrusted_pending"]

        if amount:
            dest = to_wallet.getnewaddress()
            outputs = {dest: amount}
        else:
            outputs = {"data": data}

        # Construct options dictionary
        options = {}
        if add_to_wallet is not None:
            options["add_to_wallet"] = add_to_wallet
        else:
            if psbt:
                add_to_wallet = False
            else:
                add_to_wallet = from_wallet.getwalletinfo()["private_keys_enabled"] # Default value
        if psbt is not None:
            options["psbt"] = psbt
        if conf_target is not None:
            options["conf_target"] = conf_target
        if estimate_mode is not None:
            options["estimate_mode"] = estimate_mode
        if fee_rate is not None:
            options["fee_rate"] = fee_rate
        if inputs is not None:
            options["inputs"] = inputs
        if add_inputs is not None:
            options["add_inputs"] = add_inputs
        if change_address is not None:
            options["change_address"] = change_address
        if change_position is not None:
            options["change_position"] = change_position
        if change_type is not None:
            options["change_type"] = change_type
        if include_watching is not None:
            options["include_watching"] = include_watching
        if locktime is not None:
            options["locktime"] = locktime
        if lock_unspents is not None:
            options["lock_unspents"] = lock_unspents
        if replaceable is None:
            replaceable = True # default
        else:
            options["replaceable"] = replaceable
        if subtract_fee_from_outputs is not None:
            options["subtract_fee_from_outputs"] = subtract_fee_from_outputs

        if len(options.keys()) == 0:
            options = None

        if expect_error is None:
            res = from_wallet.send(outputs=outputs, conf_target=arg_conf_target, estimate_mode=arg_estimate_mode, fee_rate=arg_fee_rate, options=options)
        else:
            try:
                assert_raises_rpc_error(expect_error[0], expect_error[1], from_wallet.send,
                    outputs=outputs, conf_target=arg_conf_target, estimate_mode=arg_estimate_mode, fee_rate=arg_fee_rate, options=options)
            except AssertionError:
                # Provide debug info if the test fails
                self.log.error("Unexpected successful result:")
                self.log.error(arg_conf_target)
                self.log.error(arg_estimate_mode)
                self.log.error(arg_fee_rate)
                self.log.error(options)
                res = from_wallet.send(outputs=outputs, conf_target=arg_conf_target, estimate_mode=arg_estimate_mode, fee_rate=arg_fee_rate, options=options)
                self.log.error(res)
                if "txid" in res and add_to_wallet:
                    self.log.error("Transaction details:")
                    try:
                        tx = from_wallet.gettransaction(res["txid"])
                        self.log.error(tx)
                        self.log.error("testmempoolaccept (transaction may already be in mempool):")
                        self.log.error(from_wallet.testmempoolaccept([tx["hex"]]))
                    except JSONRPCException as exc:
                        self.log.error(exc)

                raise

            return

        if locktime:
            return res

        if from_wallet.getwalletinfo()["private_keys_enabled"] and not include_watching:
            assert_equal(res["complete"], True)
            assert "txid" in res
        else:
            assert_equal(res["complete"], False)
            assert not "txid" in res
            assert "psbt" in res

        if add_to_wallet and not include_watching:
            # Ensure transaction exists in the wallet:
            tx = from_wallet.gettransaction(res["txid"])
            assert tx
            assert_equal(tx["bip125-replaceable"], "yes" if replaceable else "no")
            # Ensure transaction exists in the mempool:
            tx = from_wallet.getrawtransaction(res["txid"], True)
            assert tx
            if amount:
                if subtract_fee_from_outputs:
                    assert_equal(from_balance_before - from_wallet.getbalance(), amount)
                else:
                    assert_greater_than(from_balance_before - from_wallet.getbalance(), amount)
            else:
                assert next((out for out in tx["vout"] if out["scriptPubKey"]["asm"] == "OP_RETURN 35"), None)
        else:
            assert_equal(from_balance_before, from_wallet.getbalance())

        if to_wallet:
            self.sync_mempools()
            if add_to_wallet:
                if not subtract_fee_from_outputs:
                    assert_equal(to_wallet.getbalances()["mine"]["untrusted_pending"], to_untrusted_pending_before + Decimal(amount if amount else 0))
            else:
                assert_equal(to_wallet.getbalances()["mine"]["untrusted_pending"], to_untrusted_pending_before)

        return res

    def run_test(self):
        self.log.info("Setup wallets...")
        # w0 is a wallet with coinbase rewards
        w0 = self.nodes[0].get_wallet_rpc(self.default_wallet_name)
        # w1 is a regular wallet
        self.nodes[1].createwallet(wallet_name="w1")
        w1 = self.nodes[1].get_wallet_rpc("w1")
        # w2 contains the private keys for w3
        self.nodes[1].createwallet(wallet_name="w2")
        w2 = self.nodes[1].get_wallet_rpc("w2")
        # w3 is a watch-only wallet, based on w2
        self.nodes[1].createwallet(wallet_name="w3", disable_private_keys=True)
        w3 = self.nodes[1].get_wallet_rpc("w3")
        for _ in range(3):
            a2_receive = w2.getnewaddress()
            a2_change = w2.getrawchangeaddress() # doesn't actually use change derivation
            res = w3.importmulti([{
                "desc": w2.getaddressinfo(a2_receive)["desc"],
                "timestamp": "now",
                "keypool": True,
                "watchonly": True
            },{
                "desc": w2.getaddressinfo(a2_change)["desc"],
                "timestamp": "now",
                "keypool": True,
                "internal": True,
                "watchonly": True
            }])
            assert_equal(res, [{"success": True}, {"success": True}])

        w0.sendtoaddress(a2_receive, 10) # fund w3
        self.nodes[0].generate(1)
        self.sync_blocks()

        # w4 has private keys enabled, but only contains watch-only keys (from w2)
        self.nodes[1].createwallet(wallet_name="w4", disable_private_keys=False)
        w4 = self.nodes[1].get_wallet_rpc("w4")
        for _ in range(3):
            a2_receive = w2.getnewaddress()
            res = w4.importmulti([{
                "desc": w2.getaddressinfo(a2_receive)["desc"],
                "timestamp": "now",
                "keypool": False,
                "watchonly": True
            }])
            assert_equal(res, [{"success": True}])

        w0.sendtoaddress(a2_receive, 10) # fund w4
        self.nodes[0].generate(1)
        self.sync_blocks()

        self.log.info("Send to address...")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1)
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=True)

        self.log.info("Don't broadcast...")
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False)
        assert(res["hex"])

        self.log.info("Return PSBT...")
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, psbt=True)
        assert(res["psbt"])

        self.log.info("Create transaction that spends to address, but don't broadcast...")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False)
        # conf_target & estimate_mode can be set as argument or option
        res1 = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_conf_target=1, arg_estimate_mode="economical", add_to_wallet=False)
        res2 = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=1, estimate_mode="economical", add_to_wallet=False)
        assert_equal(self.nodes[1].decodepsbt(res1["psbt"])["fee"],
                     self.nodes[1].decodepsbt(res2["psbt"])["fee"])
        # but not at the same time
        for mode in ["unset", "economical", "conservative"]:
            self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_conf_target=1, arg_estimate_mode="economical",
                conf_target=1, estimate_mode=mode, add_to_wallet=False,
                expect_error=(-8, "Pass conf_target and estimate_mode either as arguments or in the options object, but not both"))

        self.log.info("Create PSBT from watch-only wallet w3, sign with w2...")
        res = self.test_send(from_wallet=w3, to_wallet=w1, amount=1)
        res = w2.walletprocesspsbt(res["psbt"])
        assert res["complete"]

        self.log.info("Create PSBT from wallet w4 with watch-only keys, sign with w2...")
        self.test_send(from_wallet=w4, to_wallet=w1, amount=1, expect_error=(-4, "Insufficient funds"))
        res = self.test_send(from_wallet=w4, to_wallet=w1, amount=1, include_watching=True, add_to_wallet=False)
        res = w2.walletprocesspsbt(res["psbt"])
        assert res["complete"]

        self.log.info("Create OP_RETURN...")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1)
        self.test_send(from_wallet=w0, data="Hello World", expect_error=(-8, "Data must be hexadecimal string (not 'Hello World')"))
        self.test_send(from_wallet=w0, data="23")
        res = self.test_send(from_wallet=w3, data="23")
        res = w2.walletprocesspsbt(res["psbt"])
        assert res["complete"]

        self.log.info("Test setting explicit fee rate")
        res1 = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate="10", add_to_wallet=False)
        res2 = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate="10", add_to_wallet=False)
        assert_equal(self.nodes[1].decodepsbt(res1["psbt"])["fee"], self.nodes[1].decodepsbt(res2["psbt"])["fee"])

        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=10, add_to_wallet=False)
        fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.0001"))

        # "unset" and None are treated the same for estimate_mode
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=20, estimate_mode="unset", add_to_wallet=False)
        fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.0002"))

        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=14.531, add_to_wallet=False)
        fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.00014531"))

        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=30, add_to_wallet=False)
        fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.0003"))

        # Test that passing fee_rate as both an argument and an option raises.
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=10, fee_rate=10, add_to_wallet=False,
                       expect_error=(-8, "Pass the fee_rate either as an argument, or in the options object, but not both"))

        assert_raises_rpc_error(-8, "Use fee_rate (sat/vB) instead of feeRate", w0.send, {w1.getnewaddress(): 1}, 6, "conservative", 1, {"feeRate": 0.01})

        assert_raises_rpc_error(-3, "Unexpected key totalFee", w0.send, {w1.getnewaddress(): 1}, 6, "conservative", 1, {"totalFee": 0.01})

        for target, mode in product([-1, 0, 1009], ["economical", "conservative"]):
            self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=target, estimate_mode=mode,
                expect_error=(-8, "Invalid conf_target, must be between 1 and 1008"))  # max value of 1008 per src/policy/fees.h
        msg = 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"'
        for target, mode in product([-1, 0], ["ltc/kb", "sat/b"]):
            self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=target, estimate_mode=mode, expect_error=(-8, msg))
        for mode in ["", "foo", Decimal("3.141592")]:
            self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=0.1, estimate_mode=mode, expect_error=(-8, msg))
            self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_conf_target=0.1, arg_estimate_mode=mode, expect_error=(-8, msg))
            assert_raises_rpc_error(-8, msg, w0.send, {w1.getnewaddress(): 1}, 0.1, mode)

        for mode in ["economical", "conservative", "ltc/kb", "sat/b"]:
            self.log.debug("{}".format(mode))
            for k, v in {"string": "true", "object": {"foo": "bar"}}.items():
                self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=v, estimate_mode=mode,
                    expect_error=(-3, "Expected type number for conf_target, got {}".format(k)))

        # Test setting explicit fee rate just below the minimum and at zero.
        self.log.info("Explicit fee rate raises RPC error 'fee rate too low' if fee_rate of 9.99999999 is passed")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=9.99999999,
            expect_error=(-4, "Fee rate (9.999 sat/vB) is lower than the minimum fee rate setting (10.000 sat/vB)"))
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=9.99999999,
            expect_error=(-4, "Fee rate (9.999 sat/vB) is lower than the minimum fee rate setting (10.000 sat/vB)"))
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=0,
            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (10.000 sat/vB)"))
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=0,
            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (10.000 sat/vB)"))

        # TODO: Return hex if fee rate is below -maxmempool
        # res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=0.1, estimate_mode="sat/b", add_to_wallet=False)
        # assert res["hex"]
        # hex = res["hex"]
        # res = self.nodes[0].testmempoolaccept([hex])
        # assert not res[0]["allowed"]
        # assert_equal(res[0]["reject-reason"], "...") # low fee
        # assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.000001"))

        self.log.info("If inputs are specified, do not automatically add more...")
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=51, inputs=[], add_to_wallet=False)
        assert res["complete"]
        utxo1 = w0.listunspent()[0]
        assert_equal(utxo1["amount"], 50)
        self.test_send(from_wallet=w0, to_wallet=w1, amount=51, inputs=[utxo1],
                       expect_error=(-4, "Insufficient funds"))
        self.test_send(from_wallet=w0, to_wallet=w1, amount=51, inputs=[utxo1], add_inputs=False,
                       expect_error=(-4, "Insufficient funds"))
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=51, inputs=[utxo1], add_inputs=True, add_to_wallet=False)
        assert res["complete"]

        self.log.info("Manual change address and position...")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, change_address="not an address",
                       expect_error=(-5, "Change address must be a valid litecoin address"))
        change_address = w0.getnewaddress()
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False, change_address=change_address)
        assert res["complete"]
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False, change_address=change_address, change_position=0)
        assert res["complete"]
        assert_equal(self.nodes[0].decodepsbt(res["psbt"])["tx"]["vout"][0]["scriptPubKey"]["addresses"], [change_address])
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=False, change_type="legacy", change_position=0)
        assert res["complete"]
        change_address = self.nodes[0].decodepsbt(res["psbt"])["tx"]["vout"][0]["scriptPubKey"]["addresses"][0]
        assert change_address[0] == "m" or change_address[0] == "n"

        self.log.info("Set lock time...")
        height = self.nodes[0].getblockchaininfo()["blocks"]
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, locktime=height + 1)
        assert res["complete"]
        assert res["txid"]
        txid = res["txid"]
        # Although the wallet finishes the transaction, it can't be added to the mempool yet:
        hex = self.nodes[0].gettransaction(res["txid"])["hex"]
        res = self.nodes[0].testmempoolaccept([hex])
        assert not res[0]["allowed"]
        assert_equal(res[0]["reject-reason"], "non-final")
        # It shouldn't be confirmed in the next block
        self.nodes[0].generate(1)
        assert_equal(self.nodes[0].gettransaction(txid)["confirmations"], 0)
        # The mempool should allow it now:
        res = self.nodes[0].testmempoolaccept([hex])
        assert res[0]["allowed"]
        # Don't wait for wallet to add it to the mempool:
        res = self.nodes[0].sendrawtransaction(hex)
        self.nodes[0].generate(1)
        assert_equal(self.nodes[0].gettransaction(txid)["confirmations"], 1)
        self.sync_all()

        self.log.info("Lock unspents...")
        utxo1 = w0.listunspent()[0]
        assert_greater_than(utxo1["amount"], 1)
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, inputs=[utxo1], add_to_wallet=False, lock_unspents=True)
        assert res["complete"]
        locked_coins = w0.listlockunspent()
        assert_equal(len(locked_coins), 1)
        # Locked coins are automatically unlocked when manually selected
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, inputs=[utxo1], add_to_wallet=False)
        assert res["complete"]

        self.log.info("Replaceable...")
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=True, replaceable=True)
        assert res["complete"]
        assert_equal(self.nodes[0].gettransaction(res["txid"])["bip125-replaceable"], "yes")
        res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, add_to_wallet=True, replaceable=False)
        assert res["complete"]
        assert_equal(self.nodes[0].gettransaction(res["txid"])["bip125-replaceable"], "no")

        self.log.info("Subtract fee from output")
        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, subtract_fee_from_outputs=[0])


if __name__ == '__main__':
    WalletSendTest().main()
