import unittest
import tempfile
from os.path import join

from logFileModel import LogFileModel
from line import Line


class TestLogFileModel(unittest.TestCase):

    def setUp(self):
        self.test_dir = tempfile.TemporaryDirectory()
        self.tmpfile = join(self.test_dir.name, "my.log")
        self.model = LogFileModel(self.tmpfile)

    def tearDown(self):
        self.test_dir.cleanup()

    def write_str(self, string: str):
        with open(self.tmpfile, "w+b") as f:
            f.write(string.encode("utf8"))

    def test_load_from_beginning(self):
        self.write_str("1\n2\n3\n4\n5\n6\n7\n")
        expected_lines = ["1", "2", "3", "4", "5"]

        lines = self.model.data(0, 0, 5)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_load_from_middle_of_first_line(self):
        self.write_str("abc\ndef\nghi\njkl")
        expected_lines = ["def", "ghi", "jkl"]

        lines = self.model.data(1, 0, 3)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_read_from_newline_character(self):
        self.write_str("abc\ndef\nghi\njkl")
        expected_lines = ["def", "ghi"]

        lines = self.model.data(3, 0, 2)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)


    def test_negative_byte_offset(self):
        self.write_str("abc\ndef\nghi\njkl")
        expected_lines = ["abc","def"]

        lines = self.model.data(-1, 0, 2)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_empty_last_line_is_ignored(self):
        self.write_str("1\n")
        expected_lines = ["1"]

        lines = self.model.data(0, 0, 5)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_load_more_lines_than_are_available(self):
        """
        Wants to read 4 lines in a file with only 3 lines.
        Returns all three lines.
        """
        self.write_str("abc\ndef\nghi")
        expected_lines = ["abc", "def", "ghi"]

        lines = self.model.data(0, 0, 4)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_read_behind_eof(self):
        """
        Wants to read 4 lines from the middle of the second line.
        File has only 3 lines.
        Returns all 3 lines.
        """
        text = "abc\ndef\nghi"
        self.write_str(text)
        expected_lines = ["abc", "def", "ghi"]

        lines = self.model.data(text.index("e"), 0, 4)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

    def test_read_after_scrolling_2_lines(self):
        """

        """
        text = "0___\n1___\n2___\n3___\n4___\n5___"
        self.write_str(text)
        expected_lines = ["3___", "4___"]

        lines = self.model.data(text.index("1___"), 2, 2)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)


    def test_scroll_with_float(self):
        """
        If lines to lines to return is a float, then the value is rounded up.
        Floats mean that the text area is such that a line is partially visible.
        """
        text = "0___\n1___\n2___\n3___\n4___\n5___"
        self.write_str(text)
        expected_lines = ["3___","4___", "5___"]

        lines = self.model.data(text.index("1___"), 2, 2.1)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)


    def test_scroll_up_at_beginning_of_file(self):
        """
        Scrolling up at beginning of file.
        Return
        """
        text = "0___\n1___\n2___\n3___\n4___\n5___"
        self.write_str(text)
        expected_lines = ["0___", "1___"]

        lines = self.model.data(5, -2, 2)

        line_str = [l.line() for l in lines]
        self.assertEqual(expected_lines, line_str)

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