from __future__ import annotations

import pytest

from yuxi.channels.adapters.telegram.chunking import chunk_text


class TestTextChunking:
    def test_short_text_no_chunk(self):
        result = chunk_text("hello world")
        assert len(result) == 1
        assert result[0] == "hello world"

    def test_exact_limit(self):
        text = "a" * 4096
        result = chunk_text(text)
        assert len(result) == 1
        assert len(result[0]) == 4096

    def test_over_limit_splits_at_paragraph(self):
        para1 = "A" * 3000
        para2 = "B" * 3000
        text = f"{para1}\n\n{para2}"
        result = chunk_text(text)
        assert len(result) == 2

    def test_over_limit_splits_at_sentence(self):
        text = ("A" * 1000 + "\u3002") * 5
        result = chunk_text(text)
        assert len(result) == 2

    def test_empty_text(self):
        result = chunk_text("")
        assert len(result) == 1
        assert result[0] == ""

    def test_source_lines_unchanged_below_80(self):
        result = chunk_text("hello world")
        assert result == ["hello world"]

    def test_chunk_size_less_than_limit(self):
        text = "B" * 5000
        for ch in chunk_text(text):
            assert len(ch) <= 4096, f"Chunk length {len(ch)} exceeds limit"