import numpy as np

from plotly import optional_imports
from ..utils import is_num_list
from plotly.utils import get_by_path, node_generator

import copy

matplotlylib = optional_imports.get_module("plotly.matplotlylib")

if matplotlylib:
    import matplotlib

    # Force matplotlib to not use any Xwindows backend.
    matplotlib.use("Agg")
    from plotly.matplotlylib import Exporter, PlotlyRenderer


def run_fig(fig):
    renderer = PlotlyRenderer()
    exporter = Exporter(renderer)
    print(exporter)
    exporter.run(fig)
    return renderer


class NumpyTestUtilsMixin(object):
    """Provides some helper functions to make testing easier."""

    def _format_path(self, path):
        str_path = [repr(p) for p in path]
        return "[" + "][".join(sp for sp in str_path) + "]"

    def assert_fig_equal(self, d1, d2, msg=None, ignore=["uid"]):
        """
        Helper function for assert_dict_equal

        By default removes uid from d1 and/or d2 if present
        then calls assert_dict_equal.

        :param (list|tuple) ignore: sequence of key names as
            strings that are removed from both d1 and d2 if
            they exist
        """
        # deep copy d1 and d2
        if "to_plotly_json" in dir(d1):
            d1_copy = copy.deepcopy(d1.to_plotly_json())
        else:
            d1_copy = copy.deepcopy(d1)

        if "to_plotly_json" in dir(d2):
            d2_copy = copy.deepcopy(d2.to_plotly_json())
        else:
            d2_copy = copy.deepcopy(d2)

        for key in ignore:
            if key in d1_copy.keys():
                del d1_copy[key]
            if key in d2_copy.keys():
                del d2_copy[key]

        self.assert_dict_equal(d1_copy, d2_copy, msg=None)

    def assert_dict_equal(self, d1, d2, msg=None):
        """
        Uses `np.allclose()` on number arrays.

        :raises: (AssertionError) Using TestCase's self.failureException

        """
        self.assertIsInstance(d1, dict, "First argument is not a dictionary")
        self.assertIsInstance(d2, dict, "Second argument is not a dictionary")

        for node, path in node_generator(d1):

            # first check that this sub-dict is contained in both dicts
            try:
                comp_node = get_by_path(d2, path)
            except (KeyError, IndexError):
                standard_msg = "Path {} exists in dict 1, but not dict 2.".format(path)
                self.fail(self._formatMessage(msg, standard_msg))
            self.assertIsInstance(
                comp_node, dict, "Value at path {} is not a dict.".format(path)
            )

            # check that each key in the first is contained in the second
            for key, val in node.items():
                if isinstance(val, dict):
                    continue  # this gets tested as its own node

                # check that the values at this key are equal
                val_path = path + (key,)
                try:
                    comp_val = comp_node[key]
                except KeyError:
                    standard_msg = "Path {} exists in dict 1, but not dict 2.".format(
                        self._format_path(val_path)
                    )
                    self.fail(self._formatMessage(msg, standard_msg))

                if isinstance(val, np.ndarray) or isinstance(comp_val, np.ndarray):
                    if np.array_equal(val, comp_val):
                        continue
                elif val == comp_val:
                    continue

                if is_num_list(val) and is_num_list(comp_val):
                    if np.allclose(val, comp_val):
                        continue

                standard_msg = (
                    "Value comparison failed at path {}.\n"
                    "{} != {}".format(self._format_path(val_path), val, comp_val)
                )
                self.fail(self._formatMessage(msg, standard_msg))

            # finally, check that keys in the second are in the first
            for key in comp_node:
                val_path = path + (key,)
                if key not in node:
                    standard_msg = "Path {} exists in dict 2, but not dict 1.".format(
                        self._format_path(val_path)
                    )
                    self.fail(self._formatMessage(msg, standard_msg))
