#!/usr/bin/env python3
"""Unit tests for piped response templates and message_path_bytes_per_hop."""

import configparser
from unittest.mock import MagicMock, Mock

import pytest

from modules.commands.test_command import TestCommand as MeshTestCommand
from modules.models import MeshMessage
from modules.response_template import format_piped_template
from modules.utils import message_path_bytes_per_hop


@pytest.mark.unit
def test_message_path_bytes_per_hop_from_routing():
    msg = MeshMessage(
        content="test",
        channel="c",
        routing_info={"bytes_per_hop": 2, "path_length": 1, "path_nodes": ["0102"]},
    )
    assert message_path_bytes_per_hop(msg) == 2


@pytest.mark.unit
def test_hopless_packet_is_never_multibyte():
    """bytes_per_hop describes how a path is encoded; a direct packet has no path for
    it to describe, so pathbytes_min must not read the format field as a wide path."""
    msg = MeshMessage(
        content="test",
        channel="c",
        path="Direct",
        routing_info={"bytes_per_hop": 2, "path_length": 0, "path_nodes": []},
    )
    assert message_path_bytes_per_hop(msg) == 1


@pytest.mark.unit
def test_pathbytes_min_hides_label_on_a_direct_message():
    """A direct message has no path distance, so the whole clause must disappear
    rather than render "Path Dist: N/A"."""
    msg = MeshMessage(
        content="test",
        channel="c",
        path="Direct",
        routing_info={"bytes_per_hop": 2, "path_length": 0, "path_nodes": []},
    )
    out = format_piped_template(
        "ack{path_distance|pathbytes_min:2|prefix_if_nonempty: | Path Dist: }",
        {"path_distance": "N/A"},
        message=msg,
    )
    assert out == "ack"


@pytest.mark.unit
def test_pathbytes_min_still_passes_a_real_multibyte_path():
    msg = MeshMessage(
        content="test",
        channel="c",
        path="7a2a,0102 (2 hops)",
        routing_info={"bytes_per_hop": 2, "path_length": 2, "path_nodes": ["7A2A", "0102"]},
    )
    out = format_piped_template(
        "ack{path_distance|pathbytes_min:2|prefix_if_nonempty: | Path Dist: }",
        {"path_distance": "12.4km"},
        message=msg,
    )
    assert out == "ack | Path Dist: 12.4km"


@pytest.mark.unit
def test_message_path_bytes_per_hop_infers_from_nodes():
    msg = MeshMessage(
        content="test",
        channel="c",
        path="01,02,03 (3 hops)",
        routing_info=None,
    )
    assert message_path_bytes_per_hop(msg) == 1


@pytest.mark.unit
def test_format_piped_template_plain_field():
    out = format_piped_template("a={x}|end", {"x": "hi"}, message=None)
    assert out == "a=hi|end"


@pytest.mark.unit
def test_format_piped_template_drops_label_for_empty_field():
    out = format_piped_template(
        "hash={packet_hash|prefix_if_nonempty:id:}.",
        {"packet_hash": ""},
        message=None,
    )
    assert out == "hash=."


@pytest.mark.unit
def test_pathbytes_min_clears_when_below_threshold():
    msg = MeshMessage(
        content="test",
        channel="c",
        routing_info={"bytes_per_hop": 1, "path_length": 2, "path_nodes": ["01", "02"]},
    )
    out = format_piped_template(
        "d={path_distance|pathbytes_min:2}",
        {"path_distance": "10.0km (1 segs)"},
        message=msg,
    )
    assert out == "d="


@pytest.mark.unit
def test_pathbytes_min_keeps_multibyte():
    msg = MeshMessage(
        content="test",
        channel="c",
        routing_info={"bytes_per_hop": 2, "path_length": 1, "path_nodes": ["0102"]},
    )
    out = format_piped_template(
        "d={path_distance|pathbytes:2}",
        {"path_distance": "5.0km (1 segs)"},
        message=msg,
    )
    assert out == "d=5.0km (1 segs)"


@pytest.mark.unit
def test_prefix_if_nonempty_literal_may_contain_pipe():
    """Regression: args like ' | Path Dist: ' must not split into a fake 'Path Dist' filter."""
    msg = MeshMessage(
        content="test",
        channel="c",
        routing_info={"bytes_per_hop": 2, "path_length": 1, "path_nodes": ["0102"]},
    )
    out = format_piped_template(
        "x={path_distance|pathbytes_min:2|prefix_if_nonempty: | Path Dist: }",
        {"path_distance": "1km"},
        message=msg,
        logger=None,
    )
    assert out == "x= | Path Dist: 1km"


@pytest.mark.unit
def test_get_response_format_test_command_over_keywords():
    bot = MagicMock()
    bot.logger = Mock()
    bot.config = configparser.ConfigParser()
    bot.config.add_section("Bot")
    bot.config.set("Bot", "bot_name", "TestBot")
    bot.config.add_section("Channels")
    bot.config.set("Channels", "monitor_channels", "general")
    bot.config.set("Channels", "respond_to_dms", "true")
    bot.config.add_section("Keywords")
    bot.config.set("Keywords", "test", "from-keywords")
    bot.config.add_section("Test_Command")
    bot.config.set("Test_Command", "enabled", "true")
    bot.config.set("Test_Command", "response_format", "from-test-cmd")
    bot.config.add_section("Path_Command")
    bot.config.set("Path_Command", "recency_weight", "0.2")
    bot.translator = MagicMock()
    bot.translator.translate = Mock(side_effect=lambda key, **kwargs: key)
    bot.prefix_hex_chars = 2

    cmd = MeshTestCommand(bot)
    assert cmd.get_response_format() == "from-test-cmd"


@pytest.mark.unit
def test_test_command_response_expands_rssi_placeholder():
    bot = MagicMock()
    bot.logger = Mock()
    bot.config = configparser.ConfigParser()
    bot.config.add_section("Bot")
    bot.config.set("Bot", "bot_name", "TestBot")
    bot.config.add_section("Channels")
    bot.config.set("Channels", "monitor_channels", "general")
    bot.config.set("Channels", "respond_to_dms", "true")
    bot.config.add_section("Test_Command")
    bot.config.set("Test_Command", "enabled", "true")
    bot.config.add_section("Path_Command")
    bot.config.set("Path_Command", "recency_weight", "0.2")
    bot.translator = MagicMock()
    bot.translator.translate = Mock(side_effect=lambda key, **kwargs: key)
    bot.prefix_hex_chars = 2

    cmd = MeshTestCommand(bot)
    msg = MeshMessage(
        content="test",
        sender_id="Alice",
        path="Direct (0 hops)",
        hops=0,
        snr=12.25,
        rssi=-91,
        routing_info={"path_length": 0},
    )

    out = cmd.format_response(msg, "RSSI: {rssi} | SNR: {snr} | Dist: {firstlast_distance}")

    assert out == "RSSI: -91 | SNR: 12.25 | Dist: N/A"


@pytest.mark.unit
def test_test_command_response_expands_packet_hash_placeholder():
    bot = MagicMock()
    bot.logger = Mock()
    bot.config = configparser.ConfigParser()
    bot.config.add_section("Bot")
    bot.config.set("Bot", "bot_name", "TestBot")
    bot.config.add_section("Channels")
    bot.config.set("Channels", "monitor_channels", "general")
    bot.config.set("Channels", "respond_to_dms", "true")
    bot.config.add_section("Test_Command")
    bot.config.set("Test_Command", "enabled", "true")
    bot.config.add_section("Path_Command")
    bot.config.set("Path_Command", "recency_weight", "0.2")
    bot.translator = MagicMock()
    bot.translator.translate = Mock(side_effect=lambda key, **kwargs: key)
    bot.prefix_hex_chars = 2

    cmd = MeshTestCommand(bot)
    msg = MeshMessage(
        content="test",
        sender_id="Alice",
        path="Direct (0 hops)",
        hops=0,
        snr=12.25,
        rssi=-91,
        routing_info={"path_length": 0, "packet_hash": "ABCDEF0123456789"},
    )

    out = cmd.format_response(msg, "hash={packet_hash}")

    assert out == "hash=ABCDEF0123456789"


@pytest.mark.unit
def test_test_command_response_omits_missing_packet_hash():
    bot = MagicMock()
    bot.logger = Mock()
    bot.config = configparser.ConfigParser()
    bot.config.add_section("Bot")
    bot.config.set("Bot", "bot_name", "TestBot")
    bot.config.add_section("Channels")
    bot.config.set("Channels", "monitor_channels", "general")
    bot.config.set("Channels", "respond_to_dms", "true")
    bot.config.add_section("Test_Command")
    bot.config.set("Test_Command", "enabled", "true")
    bot.config.add_section("Path_Command")
    bot.config.set("Path_Command", "recency_weight", "0.2")
    bot.translator = MagicMock()
    bot.translator.translate = Mock(side_effect=lambda key, **kwargs: key)
    bot.prefix_hex_chars = 2

    cmd = MeshTestCommand(bot)
    msg = MeshMessage(
        content="test",
        sender_id="Alice",
        path="Direct (0 hops)",
        hops=0,
        routing_info={"path_length": 0},
    )

    out = cmd.format_response(msg, "hash={packet_hash|prefix_if_nonempty:id:}.")

    assert out == "hash=."


def _msg(**kw):
    base = dict(content="test", channel="c")
    base.update(kw)
    return MeshMessage(**base)


@pytest.mark.unit
def test_hops_min_clears_on_a_direct_message():
    out = format_piped_template(
        "ack{d|hops_min:1|prefix_if_nonempty: | Dist: }",
        {"d": "N/A"},
        message=_msg(path="Direct", hops=0, routing_info={"path_length": 0, "bytes_per_hop": 2}),
    )
    assert out == "ack"


@pytest.mark.unit
def test_hops_min_keeps_a_single_byte_multihop_path():
    """The point of hops_min over pathbytes_min: a one-byte path still travelled,
    so its distance is real and must not be discarded with the direct messages."""
    msg = _msg(path="01,02 (2 hops)", hops=2,
               routing_info={"path_length": 2, "path_nodes": ["01", "02"], "bytes_per_hop": 1})
    assert format_piped_template("{d|hops_min:1}", {"d": "12.4km"}, message=msg) == "12.4km"
    assert format_piped_template("{d|pathbytes_min:2}", {"d": "12.4km"}, message=msg) == ""


@pytest.mark.unit
def test_hops_min_threshold_is_inclusive():
    msg = _msg(path="01,02 (2 hops)", hops=2)
    assert format_piped_template("{d|hops_min:2}", {"d": "x"}, message=msg) == "x"
    assert format_piped_template("{d|hops_min:3}", {"d": "x"}, message=msg) == ""


@pytest.mark.unit
def test_hops_min_zero_admits_a_direct_message():
    msg = _msg(path="Direct", hops=0)
    assert format_piped_template("{d|hops_min:0}", {"d": "x"}, message=msg) == "x"


@pytest.mark.unit
def test_hops_min_clears_when_the_hop_count_is_unknown():
    """A gate that cannot confirm the route suppresses rather than guesses."""
    msg = _msg(path=None, hops=None, routing_info=None)
    assert format_piped_template("{d|hops_min:1}", {"d": "x"}, message=msg) == ""


@pytest.mark.unit
def test_hops_min_without_a_message_clears():
    assert format_piped_template("{d|hops_min:1}", {"d": "x"}, message=None) == ""


@pytest.mark.unit
def test_hops_min_with_an_unusable_argument_passes_the_value_through():
    msg = _msg(path="Direct", hops=0)
    assert format_piped_template("{d|hops_min:abc}", {"d": "x"}, message=msg) == "x"
    assert format_piped_template("{d|hops_min:-1}", {"d": "x"}, message=msg) == "x"