#!/usr/bin/env python2
# -*- coding: utf-8 -*-

try:
    import unittest2 as unittest
except ImportError:
    import unittest
import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))

from pungi import media_split


class ConvertMediaSizeTestCase(unittest.TestCase):

    def test_size_parser_correct_number_as_int(self):
        self.assertEqual(media_split.convert_media_size(123), 123)

    def test_size_parser_correct_number_as_str(self):
        self.assertEqual(media_split.convert_media_size('123'), 123)

    def test_size_parser_with_unit_b(self):
        self.assertEqual(media_split.convert_media_size('123b'), 123)

    def test_size_parser_with_unit_k(self):
        self.assertEqual(media_split.convert_media_size('123k'), 123 * 1024)

    def test_size_parser_with_unit_M(self):
        self.assertEqual(media_split.convert_media_size('123M'),
                         123 * 1024 * 1024)

    def test_size_parser_with_unit_G(self):
        self.assertEqual(media_split.convert_media_size('123G'),
                         123 * 1024 * 1024 * 1024)

    def test_size_parser_with_negative_number(self):
        with self.assertRaises(ValueError):
            media_split.convert_media_size(-15)

    def test_size_parser_with_unknown_unit(self):
        with self.assertRaises(ValueError):
            media_split.convert_media_size('123X')


class ConvertFileSizeTestCase(unittest.TestCase):

    def test_round_up(self):
        self.assertEqual(media_split.convert_file_size(123, 2048), 2048)

    def test_exactly_block_size(self):
        self.assertEqual(media_split.convert_file_size(100, 100), 100)


def bl(s):
    return s * 2048


class MediaSplitterTestCase(unittest.TestCase):

    def test_sum_size(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('first', bl(20))
        ms.add_file('second', bl(30))
        ms.add_file('third', 10)

        self.assertEqual(ms.total_size, bl(50) + 10)
        self.assertEqual(ms.total_size_in_blocks, bl(51))

    def test_add_same_file_twice(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('first', bl(20))
        ms.add_file('first', bl(20))

        self.assertEqual(ms.total_size, bl(20))

    def test_add_same_file_twice_with_different_size(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('first', bl(20))
        with self.assertRaises(ValueError):
            ms.add_file('first', bl(30))

    def test_add_too_big_file(self):
        ms = media_split.MediaSplitter(bl(100))
        with self.assertRaises(ValueError):
            ms.add_file('too-big', bl(300))

    def test_fit_on_one(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('first', bl(20))
        ms.add_file('second', bl(30))

        self.assertEqual(ms.split(),
                         [{'files': ['first', 'second'], 'size': bl(50)}])

    def test_split_on_two_discs(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('first', bl(25))
        ms.add_file('second', bl(40))
        ms.add_file('third', bl(80))

        self.assertEqual(ms.split(),
                         [{'files': ['first', 'second'], 'size': bl(65)},
                          {'files': ['third'], 'size': bl(80)}])

    def test_split_with_sticky_file(self):
        ms = media_split.MediaSplitter(bl(100))
        ms.add_file('sticky', bl(15), sticky=True)
        ms.add_file('first', bl(25))
        ms.add_file('second', bl(40))
        ms.add_file('third', bl(80))

        self.assertEqual(ms.split(),
                         [{'files': ['sticky', 'first', 'second'], 'size': bl(80)},
                          {'files': ['sticky', 'third'], 'size': bl(95)}])

if __name__ == "__main__":
    unittest.main()