from link_fixer import Link
import os
from pathlib import Path
from shutil import rmtree
import tarfile
import unittest
from unittest.mock import patch

class TestLinkFixer(unittest.TestCase):

    tgt_dir = "test/data/tgt_dir"
    lnk_dir = "test/data/lnk_dir"
    tgt_file = "test/data/tgt_dir/tgt_file.txt"
    ln_non_exists = "test/data/link.txt"
    ln_valid = "test/data/lnk_dir/ln_valid"
    ln_valid_path = "../tgt_dir/tgt_file.txt"
    ln_broken = "test/data/lnk_dir/tgt_file.txt"
    ln_broken_path = "../tgt/tgt_.txt"
    ln_no_target = "test/data/lnk_dir/ln_no_target"
    tgt_invalid = "test/data/tgt"
    inexistent = "test/data/tgt_dir/inexistent.txt"


    ln_ne_error = "Error: could not access link test/data/link.txt"
    ln_gd_error = "Error: link test/data/lnk_dr/ln_valid is not broken. Abort."
    ln_ns_error = "Error: link test/data/tgt_dir/tgt_file.txt is not a link at all. Abort."
    tgt_invalid_error = "Error: target dir test/data/tgt does not seem to exist or be a directory. Abort."
    ln_no_target_error = "Error: no match for link target in test/data/tgt_dir"


    """
    def reset_dir(self, dir_path):
        if not dir_path.is_dir():
            if dir_path.exists():
                dir_path.unlink()
            os.mkdir(dir_path)
        return
    
    def reset_file(self, file_path):
        if not file_path.is_file():
            if file_path.exists():
                filepath.unlink()
            open(file_path, 'a').close()

    def setup_test(self):

        self.reset_dir(self.tgt_dir)
        self.reset_dir(self.lnk_dir)
        self.reset_file(self.tgt_file)
        self.reset_file(self.inexistent)
        
        
        if self.ln_valid.exists() or self.ln_valid.is_symlink():
            self.ln_valid.unlink()
        self.ln_valid.symlink_to(self.ln_valid_path)
        
        if self.ln_broken.exists() or self.ln_broken.is_symlink():
            self.ln_broken.unlink()
        self.ln_broken.symlink_to(self.ln_broken_path)
        self.inexistent.unlink()
    """
    def setup_test(self):
        try:
            rmtree("test/data")
        except Exception:
            sys.exit("Error: couldn't reset test data directory! Cancelling test!")
        with tarfile.open("test/test_data.tar", "r:*") as tar:
            tar.extraction_filter = getattr(tarfile, 'data_filter')
            tar.extractall("test")


    @patch('builtins.print')
    def test_link_fixer(self, mock_print):
        self.setup_test()
        
        print("Test for inexistent link")
        with self.assertRaises(SystemExit) as err:
            Link.fix(self.ln_non_exists, self.tgt_dir)
            self.assertEqual(err.exception_code, self.ln_ne_error)

        print("Test for non-broken link")
        with self.assertRaises(SystemExit) as err:
            Link.fix(self.ln_valid, self.tgt_dir)
            self.assertEqual(err.exception.code, self.ln_gd_error)
        
        print("Test for non-link link")
        with self.assertRaises(SystemExit) as err:
            Link.fix(self.tgt_file, self.tgt_dir)
            self.assertEqual(err.exception.code, self.ln_ns_error)
        
        print("Test for invalid target")
        with self.assertRaises(SystemExit) as err:
            Link.fix(self.ln_valid, self.tgt_invalid)
            self.assertEqual(err.exception.code, self.tgt_invalid_error)

        print("Test for unfound target")
        with self.assertRaises(SystemExit) as err:
            Link.fix(self.ln_no_target, self.tgt_dir)
            self.assertEqual(erro.exception.code, self.ln_no_target_error)

        



if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG)
    runner = unittest.TextTestRunner(verbosity=2)
    unittest.main(verbosity=2)