"""倒计时前缀文字位图测试（证据 analysis/web/timedjs2.js:180-236）。"""
import pytest

from ppclock import textbitmap as TB


class TestCharUnits:
    def test_chinese_counts_one(self):
        assert TB.char_units("距离") == 2.0

    def test_english_counts_half(self):
        assert TB.char_units("ab") == 1.0
        assert TB.char_units("ab中") == 2.0
        assert TB.char_units("a中") == 1.5


class TestBitmap:
    def test_clock_bitmap_size(self):
        """16px 格：n 个单位 → n*32 字节"""
        bmp = TB.render_text_bitmap("中考", grid=16)
        assert len(bmp) == 2 * 32

    def test_calendar_bitmap_size(self):
        """24px 格：n 个单位 → n*72 字节"""
        bmp = TB.render_text_bitmap("中考", grid=24)
        assert len(bmp) == 2 * 72

    def test_bitmap_not_blank(self):
        bmp = TB.render_text_bitmap("试", grid=16)
        assert any(bmp)

    def test_grid_must_be_16_or_24(self):
        with pytest.raises(ValueError):
            TB.render_text_bitmap("x", grid=12)


class TestFrames:
    def test_clock_single_pack(self):
        """≤4 单位：单包 0{n}+位图"""
        frames = TB.prefix_frames("目标", "clock")
        assert len(frames) == 1
        assert frames[0][0:1] == bytes([0x02])  # '0'+2
        assert len(frames[0]) == 1 + 2 * 32

    def test_clock_two_packs(self):
        """>4 单位：首包 04+128B，次包 0{n}+余量"""
        frames = TB.prefix_frames("距离中考还有", "clock")  # 6 单位
        assert len(frames) == 2
        assert frames[0][0] == 0x04
        assert len(frames[0]) == 1 + 128
        assert frames[1][0] == 0x06
        assert len(frames[1]) == 1 + 2 * 32

    def test_clock_over_8_units_rejected(self):
        with pytest.raises(ValueError):
            TB.prefix_frames("一二三四五六七八九", "clock")

    def test_calendar_per_char_pack(self):
        """日历模式：每字一包 990{j}+72B"""
        frames = TB.prefix_frames("中考", "calendar")
        assert len(frames) == 2
        assert frames[0][:2] == bytes([0x99, 0x00])
        assert len(frames[0]) == 2 + 72
        assert frames[1][:2] == bytes([0x99, 0x01])

    def test_calendar_over_4_units_rejected(self):
        with pytest.raises(ValueError):
            TB.prefix_frames("一二三四五", "calendar")

    def test_fractional_units_rejected(self):
        """0.5 单位（英文混排）JS 会产生非法 hex——CLI 拒绝"""
        with pytest.raises(ValueError):
            TB.prefix_frames("a中", "clock")