"""Tests for DCC helper — TDD: tests before implementation."""

import pytest
import time

from i2p_apps.i2ptunnel.dcc import DCCHelper, DCCTransfer


class TestDCCTransfer:
    def test_transfer_creation(self):
        t = DCCTransfer(
            remote_dest="A" * 516,
            local_port=12345,
            dcc_type="SEND",
            filename="test.txt",
        )
        assert t.remote_dest == "A" * 516
        assert t.local_port == 12345
        assert t.dcc_type == "SEND"
        assert t.filename == "test.txt"

    def test_transfer_not_expired(self):
        t = DCCTransfer(
            remote_dest="A" * 516,
            local_port=12345,
            dcc_type="SEND",
            expires_at=time.monotonic() + 1800,
        )
        assert t.is_expired is False

    def test_transfer_expired(self):
        t = DCCTransfer(
            remote_dest="A" * 516,
            local_port=12345,
            dcc_type="SEND",
            expires_at=time.monotonic() - 1,
        )
        assert t.is_expired is True


class TestDCCHelper:
    def test_creation(self):
        h = DCCHelper(local_b32="test.b32.i2p", max_transfers=5)
        assert h._max_transfers == 5
        assert len(h._transfers) == 0

    def test_parse_dcc_send(self):
        h = DCCHelper(local_b32="test.b32.i2p")
        parts = h._parse_dcc("DCC SEND file.txt 2130706433 1234 5678")
        assert parts is not None
        assert parts["type"] == "SEND"
        assert parts["filename"] == "file.txt"
        assert parts["port"] == "1234"

    def test_parse_dcc_chat(self):
        h = DCCHelper(local_b32="test.b32.i2p")
        parts = h._parse_dcc("DCC CHAT chat 2130706433 1234")
        assert parts is not None
        assert parts["type"] == "CHAT"

    def test_parse_invalid(self):
        h = DCCHelper(local_b32="test.b32.i2p")
        assert h._parse_dcc("not a dcc command") is None

    def test_max_transfers_enforced(self):
        h = DCCHelper(local_b32="test.b32.i2p", max_transfers=2)
        h._transfers["t1"] = DCCTransfer("d1", 10001, "SEND", expires_at=time.monotonic() + 1800)
        h._transfers["t2"] = DCCTransfer("d2", 10002, "SEND", expires_at=time.monotonic() + 1800)
        assert h._can_add_transfer() is False

    def test_cleanup_expired(self):
        h = DCCHelper(local_b32="test.b32.i2p", max_transfers=2)
        h._transfers["t1"] = DCCTransfer("d1", 10001, "SEND", expires_at=time.monotonic() - 1)
        h._transfers["t2"] = DCCTransfer("d2", 10002, "SEND", expires_at=time.monotonic() + 1800)
        h._cleanup_expired()
        assert len(h._transfers) == 1
        assert "t2" in h._transfers

    def test_rewrite_outbound_send(self):
        h = DCCHelper(local_b32="mysite.b32.i2p")
        result = h.rewrite_outbound("DCC SEND file.txt 2130706433 1234 5678")
        assert result is not None
        assert "mysite.b32.i2p" in result
        assert "file.txt" in result