"""Tests for Telegram DM Private Chat Topics (Bot API 9.4).

Covers:
- _setup_dm_topics: loading persisted thread_ids from config
- _setup_dm_topics: creating new topics via API when no thread_id
- _persist_dm_topic_thread_id: saving thread_id back to config.yaml
- _get_dm_topic_info: looking up topic config by thread_id
- _cache_dm_topic_from_message: caching thread_ids from incoming messages
- _build_message_event: DM topic resolution in message events
"""

import os
import sys
from pathlib import Path
from types import SimpleNamespace
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from gateway.config import PlatformConfig


# Use the shared, comprehensive telegram mock from conftest instead of a
# file-local one. The previous local installer differed from every other
# telegram test's stub in two ways — it registered a SEPARATE string-valued
# ``telegram.constants`` module (others register the root mock, so ParseMode
# members stay auto-generated MagicMock attributes) and its ``telegram.error``
# was a bare MagicMock (conftest defines real exception subclasses with PTB's
# hierarchy) — and it installed UNCONDITIONALLY (no real-library guard).
# Because it also force-reimported the adapter, the divergent stub leaked into
# sys.modules for the rest of the session: every later telegram test that
# asserts ParseMode repr or isinstance against telegram.error classes failed
# order-dependently in full runs while passing in isolation.
from tests.gateway.conftest import _ensure_telegram_mock  # noqa: E402

_ensure_telegram_mock()
# Force reimport so the adapter binds to whatever sys.modules now holds
# (the shared mock, or the real library when it is installed) rather than a
# stub an earlier test file may have bound it to.
sys.modules.pop("plugins.platforms.telegram.adapter", None)

from plugins.platforms.telegram.adapter import TelegramAdapter  # noqa: E402


def _make_adapter(dm_topics_config=None, group_topics_config=None):
    """Create a TelegramAdapter with optional DM/group topics config."""
    extra = {}
    if dm_topics_config is not None:
        extra["dm_topics"] = dm_topics_config
    if group_topics_config is not None:
        extra["group_topics"] = group_topics_config
    config = PlatformConfig(enabled=True, token="***", extra=extra)
    adapter = TelegramAdapter(config)
    return adapter


# ── _setup_dm_topics: load persisted thread_ids ──


@pytest.mark.asyncio
async def test_setup_dm_topics_creates_when_no_thread_id():
    """Topics without thread_id should be created via API."""
    adapter = _make_adapter([
        {
            "chat_id": 222,
            "topics": [
                {"name": "NewTopic", "icon_color": 7322096},
            ],
        }
    ])
    adapter._bot = AsyncMock()
    mock_topic = SimpleNamespace(message_thread_id=999)
    adapter._bot.create_forum_topic.return_value = mock_topic

    # Mock the persist method so it doesn't touch the filesystem
    adapter._persist_dm_topic_thread_id = MagicMock()

    await adapter._setup_dm_topics()

    # Should have been created
    adapter._bot.create_forum_topic.assert_called_once_with(
        chat_id=222, name="NewTopic", icon_color=7322096,
    )
    # Should be in cache
    assert adapter._dm_topics["222:NewTopic"] == 999
    # Should persist
    adapter._persist_dm_topic_thread_id.assert_called_once_with(222, "NewTopic", 999)


@pytest.mark.asyncio
async def test_setup_dm_topics_mixed_persisted_and_new():
    """Mix of persisted and new topics should work correctly."""
    adapter = _make_adapter([
        {
            "chat_id": 333,
            "topics": [
                {"name": "Existing", "thread_id": 50},
                {"name": "New", "icon_color": 123},
            ],
        }
    ])
    adapter._bot = AsyncMock()
    mock_topic = SimpleNamespace(message_thread_id=777)
    adapter._bot.create_forum_topic.return_value = mock_topic
    adapter._persist_dm_topic_thread_id = MagicMock()

    await adapter._setup_dm_topics()

    # Existing loaded from config
    assert adapter._dm_topics["333:Existing"] == 50
    # New created via API
    assert adapter._dm_topics["333:New"] == 777
    # Only one API call (for "New")
    adapter._bot.create_forum_topic.assert_called_once()


# ── _create_dm_topic: error handling ──


@pytest.mark.asyncio
async def test_create_dm_topic_handles_duplicate_error():
    """Duplicate topic error should return None gracefully."""
    adapter = _make_adapter()
    adapter._bot = AsyncMock()
    adapter._bot.create_forum_topic.side_effect = Exception("topic_name_duplicate")

    result = await adapter._create_dm_topic(chat_id=111, name="General")

    assert result is None


@pytest.mark.asyncio
async def test_create_dm_topic_handles_generic_error():
    """Generic error should return None with warning."""
    adapter = _make_adapter()
    adapter._bot = AsyncMock()
    adapter._bot.create_forum_topic.side_effect = Exception("some random error")

    result = await adapter._create_dm_topic(chat_id=111, name="General")

    assert result is None


@pytest.mark.asyncio
async def test_ensure_dm_topic_creates_on_demand_and_persists():
    """Named delivery targets should create missing private DM topics on demand."""
    adapter = _make_adapter()
    adapter._bot = AsyncMock()
    adapter._bot.create_forum_topic.return_value = SimpleNamespace(message_thread_id=444)
    adapter._persist_dm_topic_thread_id = MagicMock()

    result = await adapter.ensure_dm_topic("111", "On Demand")

    assert result == "444"
    adapter._bot.create_forum_topic.assert_called_once_with(
        chat_id=111,
        name="On Demand",
    )
    assert adapter._dm_topics["111:On Demand"] == 444
    assert adapter._dm_topics_config == [
        {"chat_id": 111, "topics": [{"name": "On Demand", "thread_id": 444}]}
    ]
    adapter._persist_dm_topic_thread_id.assert_called_once_with(
        111, "On Demand", 444, replace_existing=False
    )


# ── _persist_dm_topic_thread_id ──


def test_persist_dm_topic_thread_id_writes_config(tmp_path):
    """Should write thread_id into the correct topic in config.yaml."""
    import yaml

    config_data = {
        "platforms": {
            "telegram": {
                "extra": {
                    "dm_topics": [
                        {
                            "chat_id": 111,
                            "topics": [
                                {"name": "General", "icon_color": 123},
                                {"name": "Work", "icon_color": 456},
                            ],
                        }
                    ]
                }
            }
        }
    }

    config_file = tmp_path / ".hermes" / "config.yaml"
    config_file.parent.mkdir(parents=True)
    with open(config_file, "w") as f:
        yaml.dump(config_data, f)

    adapter = _make_adapter()

    with patch.object(Path, "home", return_value=tmp_path), \
         patch.dict(os.environ, {"HERMES_HOME": str(tmp_path / ".hermes")}):
        adapter._persist_dm_topic_thread_id(111, "General", 999)

    with open(config_file) as f:
        result = yaml.safe_load(f)

    topics = result["platforms"]["telegram"]["extra"]["dm_topics"][0]["topics"]
    assert topics[0]["thread_id"] == 999
    assert "thread_id" not in topics[1]  # "Work" should be untouched


# ── _get_dm_topic_info ──


def test_persist_dm_topic_thread_id_preserves_config_on_write_failure(tmp_path):
    """Failed writes should leave the original config.yaml intact."""
    import yaml

    config_data = {
        "platforms": {
            "telegram": {
                "extra": {
                    "dm_topics": [
                        {
                            "chat_id": 111,
                            "topics": [
                                {"name": "General", "icon_color": 123},
                            ],
                        }
                    ]
                }
            }
        }
    }

    config_file = tmp_path / ".hermes" / "config.yaml"
    config_file.parent.mkdir(parents=True)
    original_text = yaml.dump(config_data)
    config_file.write_text(original_text, encoding="utf-8")

    adapter = _make_adapter()

    def fail_dump(*args, **kwargs):
        raise RuntimeError("boom")

    with patch.object(Path, "home", return_value=tmp_path), \
         patch.dict(os.environ, {"HERMES_HOME": str(tmp_path / ".hermes")}), \
         patch("yaml.dump", side_effect=fail_dump):
        adapter._persist_dm_topic_thread_id(111, "General", 999)

    assert config_file.read_text(encoding="utf-8") == original_text
    result = yaml.safe_load(config_file.read_text(encoding="utf-8"))
    topics = result["platforms"]["telegram"]["extra"]["dm_topics"][0]["topics"]
    assert "thread_id" not in topics[0]


def test_get_dm_topic_info_finds_cached_topic():
    """Should return topic config when thread_id is in cache."""
    adapter = _make_adapter([
        {
            "chat_id": 111,
            "topics": [
                {"name": "General", "skill": "my-skill"},
            ],
        }
    ])
    adapter._dm_topics["111:General"] = 100

    result = adapter._get_dm_topic_info("111", "100")

    assert result is not None
    assert result["name"] == "General"
    assert result["skill"] == "my-skill"


def test_get_dm_topic_info_hot_reloads_from_config(tmp_path):
    """Should find a topic added to config after startup (hot-reload)."""
    import yaml

    # Start with empty topics
    adapter = _make_adapter([
        {"chat_id": 111, "topics": []}
    ])

    # Write config with a new topic + thread_id
    config_data = {
        "platforms": {
            "telegram": {
                "extra": {
                    "dm_topics": [
                        {
                            "chat_id": 111,
                            "topics": [
                                {"name": "NewProject", "thread_id": 555},
                            ],
                        }
                    ]
                }
            }
        }
    }
    config_file = tmp_path / ".hermes" / "config.yaml"
    config_file.parent.mkdir(parents=True)
    with open(config_file, "w") as f:
        yaml.dump(config_data, f)

    with patch.object(Path, "home", return_value=tmp_path), \
         patch.dict(os.environ, {"HERMES_HOME": str(tmp_path / ".hermes")}):
        result = adapter._get_dm_topic_info("111", "555")

    assert result is not None
    assert result["name"] == "NewProject"
    # Should now be cached
    assert adapter._dm_topics["111:NewProject"] == 555


# ── _cache_dm_topic_from_message ──


def test_cache_dm_topic_from_message_no_overwrite():
    """Should not overwrite an existing cached topic."""
    adapter = _make_adapter()
    adapter._dm_topics["111:General"] = 100

    adapter._cache_dm_topic_from_message("111", "999", "General")

    assert adapter._dm_topics["111:General"] == 100  # unchanged


# ── _build_message_event: auto_skill binding ──


def _make_mock_message(chat_id=111, chat_type="private", text="hello", thread_id=None,
                       user_id=42, user_name="Test User", forum_topic_created=None,
                       is_topic_message=None, is_forum=None):
    """Create a mock Telegram Message for _build_message_event tests."""
    chat = SimpleNamespace(
        id=chat_id,
        type=chat_type,
        title=None,
    )
    if is_forum is not None:
        chat.is_forum = is_forum
    # Add full_name attribute for DM chats
    if not hasattr(chat, "full_name"):
        chat.full_name = user_name

    user = SimpleNamespace(
        id=user_id,
        full_name=user_name,
    )

    if is_topic_message is None:
        is_topic_message = bool(thread_id) if chat_type == "private" else None

    msg = SimpleNamespace(
        chat=chat,
        from_user=user,
        text=text,
        message_thread_id=thread_id,
        is_topic_message=is_topic_message,
        message_id=1001,
        reply_to_message=None,
        date=None,
        forum_topic_created=forum_topic_created,
    )
    return msg


def test_build_message_event_sets_auto_skill():
    """When topic has a skill binding, auto_skill should be set on the event."""
    from gateway.platforms.base import MessageType

    adapter = _make_adapter([
        {
            "chat_id": 111,
            "topics": [
                {"name": "My Project", "skill": "accessibility-auditor", "thread_id": 100},
            ],
        }
    ])
    adapter._dm_topics["111:My Project"] = 100

    msg = _make_mock_message(chat_id=111, thread_id=100, text="check this page")
    event = adapter._build_message_event(msg, MessageType.TEXT)

    assert event.auto_skill == "accessibility-auditor"
    # chat_topic should be the clean topic name, no [skill: ...] suffix
    assert event.source.chat_topic == "My Project"


def test_build_message_event_no_auto_skill_without_binding():
    """Topics without skill binding should have auto_skill=None."""
    from gateway.platforms.base import MessageType

    adapter = _make_adapter([
        {
            "chat_id": 111,
            "topics": [
                {"name": "General", "thread_id": 200},
            ],
        }
    ])
    adapter._dm_topics["111:General"] = 200

    msg = _make_mock_message(chat_id=111, thread_id=200)
    event = adapter._build_message_event(msg, MessageType.TEXT)

    assert event.auto_skill is None
    assert event.source.chat_topic == "General"


# ── _build_message_event: group_topics skill binding ──

# The telegram mock sets sys.modules["telegram.constants"] = telegram_mod (root mock),
# so `from telegram.constants import ChatType` in telegram.py resolves to
# telegram_mod.ChatType — not telegram_mod.constants.ChatType.  We must use
# the same ChatType object the production code sees so equality checks work.
from telegram.constants import ChatType as _ChatType  # noqa: E402


def test_group_topic_skill_binding():
    """Group topic with skill config should set auto_skill on the event."""
    from gateway.platforms.base import MessageType

    adapter = _make_adapter(group_topics_config=[
        {
            "chat_id": -1001234567890,
            "topics": [
                {"name": "Engineering", "thread_id": 5, "skill": "software-development"},
                {"name": "Sales", "thread_id": 12, "skill": "sales-framework"},
            ],
        }
    ])

    msg = _make_mock_message(
        chat_id=-1001234567890,
        chat_type=_ChatType.SUPERGROUP,
        thread_id=5,
        text="hello",
        is_topic_message=True,
        is_forum=True,
    )
    event = adapter._build_message_event(msg, MessageType.TEXT)

    assert event.auto_skill == "software-development"
    assert event.source.chat_topic == "Engineering"


def test_group_topic_skill_binding_second_topic():
    """A different thread_id in the same group should resolve its own skill."""
    from gateway.platforms.base import MessageType

    adapter = _make_adapter(group_topics_config=[
        {
            "chat_id": -1001234567890,
            "topics": [
                {"name": "Engineering", "thread_id": 5, "skill": "software-development"},
                {"name": "Sales", "thread_id": 12, "skill": "sales-framework"},
            ],
        }
    ])

    msg = _make_mock_message(
        chat_id=-1001234567890,
        chat_type=_ChatType.SUPERGROUP,
        thread_id=12,
        text="deal update",
        is_topic_message=True,
        is_forum=True,
    )
    event = adapter._build_message_event(msg, MessageType.TEXT)

    assert event.auto_skill == "sales-framework"
    assert event.source.chat_topic == "Sales"


# ── _build_message_event: from_user=None fallback in DMs ──