from unittest.mock import patch

import pytest
from aiogram.types import Chat, Message, User

from bot.config import load_config
from bot.main import FromLinkedChannel


def _make_message(*, is_automatic_forward: bool = False) -> Message:
    return Message(
        message_id=1,
        date=0,
        chat=Chat(id=-1001234567890, type="supergroup"),
        from_user=User(id=1, is_bot=False, first_name="Test"),
        is_automatic_forward=True if is_automatic_forward else None,
    )


@pytest.mark.asyncio
async def test_from_linked_channel_matches_automatic_forward() -> None:
    filt = FromLinkedChannel()
    assert await filt(_make_message(is_automatic_forward=True)) is True


@pytest.mark.asyncio
async def test_from_linked_channel_ignores_regular_message() -> None:
    filt = FromLinkedChannel()
    assert await filt(_make_message(is_automatic_forward=False)) is False


def test_load_config_success(tmp_path, monkeypatch) -> None:
    comment = tmp_path / "comment.txt"
    comment.write_text("Hello <b>world</b>", encoding="utf-8")

    monkeypatch.setenv("BOT_TOKEN", "123:ABC")
    monkeypatch.setenv("DISCUSSION_CHAT_ID", "-100123")
    monkeypatch.setenv("COMMENT_FILE", str(comment))

    with patch("bot.config.load_dotenv"):
        config = load_config()

    assert config.bot_token == "123:ABC"
    assert config.discussion_chat_id == -100123
    assert config.comment_text == "Hello <b>world</b>"


def test_load_config_missing_env(monkeypatch) -> None:
    monkeypatch.delenv("BOT_TOKEN", raising=False)
    monkeypatch.delenv("DISCUSSION_CHAT_ID", raising=False)

    with patch("bot.config.load_dotenv"):
        with pytest.raises(SystemExit, match="BOT_TOKEN"):
            load_config()


def test_load_config_bad_chat_id(monkeypatch, tmp_path) -> None:
    comment = tmp_path / "comment.txt"
    comment.write_text("ok", encoding="utf-8")

    monkeypatch.setenv("BOT_TOKEN", "123:ABC")
    monkeypatch.setenv("DISCUSSION_CHAT_ID", "not-an-int")
    monkeypatch.setenv("COMMENT_FILE", str(comment))

    with patch("bot.config.load_dotenv"):
        with pytest.raises(SystemExit, match="must be an integer"):
            load_config()


def test_load_config_empty_comment(monkeypatch, tmp_path) -> None:
    comment = tmp_path / "comment.txt"
    comment.write_text("   \n", encoding="utf-8")

    monkeypatch.setenv("BOT_TOKEN", "123:ABC")
    monkeypatch.setenv("DISCUSSION_CHAT_ID", "-100123")
    monkeypatch.setenv("COMMENT_FILE", str(comment))

    with patch("bot.config.load_dotenv"):
        with pytest.raises(SystemExit, match="empty"):
            load_config()