"""缩略图生成器单元测试 - 纯逻辑函数."""

from __future__ import annotations

import pytest
from video_processing.thumbnail_generator import _format_seek_time


class TestFormatSeekTime:
    """_format_seek_time 时间格式化测试."""

    def test_zero_seconds(self):
        """0秒."""
        result = _format_seek_time(0)
        assert result == "00:00:00.00"

    def test_less_than_one_second(self):
        """小于1秒."""
        result = _format_seek_time(0.5)
        assert result == "00:00:00.50"

    def test_few_seconds(self):
        """几秒."""
        result = _format_seek_time(5.5)
        assert result == "00:00:05.50"

    def test_one_minute(self):
        """1分钟."""
        result = _format_seek_time(60.0)
        assert result == "00:01:00.00"

    def test_minutes_and_seconds(self):
        """分+秒."""
        result = _format_seek_time(125.5)
        assert result == "00:02:05.50"

    def test_one_hour(self):
        """1小时."""
        result = _format_seek_time(3600.0)
        assert result == "01:00:00.00"

    def test_hours_minutes_seconds(self):
        """时+分+秒."""
        result = _format_seek_time(3725.25)
        assert result == "01:02:05.25"

    def test_long_duration(self):
        """长视频（2小时以上）."""
        result = _format_seek_time(7384.12)
        assert result == "02:03:04.12"

    def test_precision_two_decimal(self):
        """两位小数精度."""
        result = _format_seek_time(3.14159)
        assert result == "00:00:03.14"

    def test_always_two_digit_hours(self):
        """小时始终两位数字."""
        result = _format_seek_time(3600 * 9)
        assert result.startswith("09:")

    def test_always_two_digit_minutes(self):
        """分钟始终两位数字."""
        result = _format_seek_time(300)  # 5分钟
        parts = result.split(":")
        assert parts[1] == "05"

    def test_float_input(self):
        """浮点数输入."""
        result = _format_seek_time(10.0)
        assert isinstance(result, str)
        assert result == "00:00:10.00"

    def test_int_input(self):
        """整数输入."""
        result = _format_seek_time(30)
        assert result == "00:00:30.00"

    def test_format_structure(self):
        """格式结构正确：HH:MM:SS.xx."""
        result = _format_seek_time(3661.5)
        # 格式: HH:MM:SS.xx
        parts = result.split(":")
        assert len(parts) == 3
        assert "." in parts[2]
        sec_parts = parts[2].split(".")
        assert len(sec_parts) == 2
        assert len(sec_parts[1]) == 2  # 两位小数