#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import codecs
import os
import unittest

from treelib import Tree
from treelib.plugins import export_to_dot


class DotExportCase(unittest.TestCase):
    """Test class for the export to dot format function"""

    def setUp(self):
        tree = Tree()
        tree.create_node("Hárry", "hárry")
        tree.create_node("Jane", "jane", parent="hárry")
        tree.create_node("Bill", "bill", parent="hárry")
        tree.create_node("Diane", "diane", parent="jane")
        tree.create_node("George", "george", parent="bill")
        self.tree = tree

    def read_generated_output(self, filename):
        output = codecs.open(filename, "r", "utf-8")
        generated = output.read()
        output.close()

        return generated

    def test_export_to_dot(self):
        export_to_dot(self.tree, "tree.dot")
        expected = """\
digraph tree {
\t"hárry" [label="Hárry", shape=circle]
\t"bill" [label="Bill", shape=circle]
\t"jane" [label="Jane", shape=circle]
\t"george" [label="George", shape=circle]
\t"diane" [label="Diane", shape=circle]

\t"hárry" -> "jane"
\t"hárry" -> "bill"
\t"bill" -> "george"
\t"jane" -> "diane"
}"""

        self.assertTrue(
            os.path.isfile("tree.dot"), "The file tree.dot could not be found."
        )
        generated = self.read_generated_output("tree.dot")

        self.assertEqual(
            generated, expected, "Generated dot tree is not the expected one"
        )
        os.remove("tree.dot")

    def test_export_to_dot_empty_tree(self):
        empty_tree = Tree()
        export_to_dot(empty_tree, "tree.dot")

        expected = """\
digraph tree {
}"""
        self.assertTrue(
            os.path.isfile("tree.dot"), "The file tree.dot could not be found."
        )
        generated = self.read_generated_output("tree.dot")

        self.assertEqual(
            expected, generated, "The generated output for an empty tree is not empty"
        )
        os.remove("tree.dot")

    def test_unicode_filename(self):
        tree = Tree()
        tree.create_node("Node 1", "node_1")
        export_to_dot(tree, "ŕʩϢ.dot")

        expected = """\
digraph tree {
\t"node_1" [label="Node 1", shape=circle]
}"""
        self.assertTrue(
            os.path.isfile("ŕʩϢ.dot"), "The file ŕʩϢ.dot could not be found."
        )
        generated = self.read_generated_output("ŕʩϢ.dot")
        self.assertEqual(
            expected, generated, "The generated file content is not the expected one"
        )
        os.remove("ŕʩϢ.dot")

    def test_export_with_minus_in_filename(self):
        tree = Tree()
        tree.create_node("Example Node", "example-node")
        expected = """\
digraph tree {
\t"example-node" [label="Example Node", shape=circle]
}"""

        export_to_dot(tree, "id_with_minus.dot")
        self.assertTrue(
            os.path.isfile("id_with_minus.dot"),
            "The file id_with_minus.dot could not be found.",
        )
        generated = self.read_generated_output("id_with_minus.dot")
        self.assertEqual(
            expected, generated, "The generated file content is not the expected one"
        )
        os.remove("id_with_minus.dot")

    def tearDown(self):
        self.tree = None