import re
import subprocess
import sys

import numpy as np
import pytest

from matplotlib import _preprocess_data
from matplotlib.axes import Axes
from matplotlib.testing.decorators import check_figures_equal

# Notes on testing the plotting functions itself
# *   the individual decorated plotting functions are tested in 'test_axes.py'
# *   that pyplot functions accept a data kwarg is only tested in
#     test_axes.test_pie_linewidth_0


# this gets used in multiple tests, so define it here
@_preprocess_data(replace_names=["x", "y"], label_namer="y")
def plot_func(ax, x, y, ls="x", label=None, w="xyz"):
    return ("x: %s, y: %s, ls: %s, w: %s, label: %s" % (
        list(x), list(y), ls, w, label))


all_funcs = [plot_func]
all_func_ids = ['plot_func']


def test_compiletime_checks():
    """Test decorator invocations -> no replacements."""

    def func(ax, x, y): pass
    def func_args(ax, x, y, *args): pass
    def func_kwargs(ax, x, y, **kwargs): pass
    def func_no_ax_args(*args, **kwargs): pass

    # this is ok
    _preprocess_data(replace_names=["x", "y"])(func)
    _preprocess_data(replace_names=["x", "y"])(func_kwargs)
    # this has "enough" information to do all the replaces
    _preprocess_data(replace_names=["x", "y"])(func_args)

    # no positional_parameter_names but needed due to replaces
    with pytest.raises(AssertionError):
        # z is unknown
        _preprocess_data(replace_names=["x", "y", "z"])(func_args)

    # no replacements at all -> all ok...
    _preprocess_data(replace_names=[], label_namer=None)(func)
    _preprocess_data(replace_names=[], label_namer=None)(func_args)
    _preprocess_data(replace_names=[], label_namer=None)(func_kwargs)
    _preprocess_data(replace_names=[], label_namer=None)(func_no_ax_args)

    # label namer is unknown
    with pytest.raises(AssertionError):
        _preprocess_data(label_namer="z")(func)

    with pytest.raises(AssertionError):
        _preprocess_data(label_namer="z")(func_args)


@pytest.mark.parametrize('func', all_funcs, ids=all_func_ids)
def test_function_call_without_data(func):
    """Test without data -> no replacements."""
    assert (func(None, "x", "y") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: None")
    assert (func(None, x="x", y="y") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: None")
    assert (func(None, "x", "y", label="") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: ")
    assert (func(None, "x", "y", label="text") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: text")
    assert (func(None, x="x", y="y", label="") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: ")
    assert (func(None, x="x", y="y", label="text") ==
            "x: ['x'], y: ['y'], ls: x, w: xyz, label: text")


@pytest.mark.parametrize('func', all_funcs, ids=all_func_ids)
def test_function_call_with_dict_input(func):
    """Tests with dict input, unpacking via preprocess_pipeline"""
    data = {'a': 1, 'b': 2}
    assert (func(None, data.keys(), data.values()) ==
            "x: ['a', 'b'], y: [1, 2], ls: x, w: xyz, label: None")


@pytest.mark.parametrize('func', all_funcs, ids=all_func_ids)
def test_function_call_with_dict_data(func):
    """Test with dict data -> label comes from the value of 'x' parameter."""
    data = {"a": [1, 2], "b": [8, 9], "w": "NOT"}
    assert (func(None, "a", "b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func(None, x="a", y="b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func(None, "a", "b", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (func(None, "a", "b", label="text", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")
    assert (func(None, x="a", y="b", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (func(None, x="a", y="b", label="text", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")


@pytest.mark.parametrize('func', all_funcs, ids=all_func_ids)
def test_function_call_with_dict_data_not_in_data(func):
    """Test the case that one var is not in data -> half replaces, half kept"""
    data = {"a": [1, 2], "w": "NOT"}
    assert (func(None, "a", "b", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: b")
    assert (func(None, x="a", y="b", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: b")
    assert (func(None, "a", "b", label="", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: ")
    assert (func(None, "a", "b", label="text", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: text")
    assert (func(None, x="a", y="b", label="", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: ")
    assert (func(None, x="a", y="b", label="text", data=data) ==
            "x: [1, 2], y: ['b'], ls: x, w: xyz, label: text")


@pytest.mark.parametrize('func', all_funcs, ids=all_func_ids)
def test_function_call_with_pandas_data(func, pd):
    """Test with pandas dataframe -> label comes from ``data["col"].name``."""
    data = pd.DataFrame({"a": np.array([1, 2], dtype=np.int32),
                         "b": np.array([8, 9], dtype=np.int32),
                         "w": ["NOT", "NOT"]})

    assert (func(None, "a", "b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func(None, x="a", y="b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func(None, "a", "b", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (func(None, "a", "b", label="text", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")
    assert (func(None, x="a", y="b", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (func(None, x="a", y="b", label="text", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")


def test_function_call_replace_all():
    """Test without a "replace_names" argument, all vars should be replaced."""
    data = {"a": [1, 2], "b": [8, 9], "x": "xyz"}

    @_preprocess_data(label_namer="y")
    def func_replace_all(ax, x, y, ls="x", label=None, w="NOT"):
        return "x: %s, y: %s, ls: %s, w: %s, label: %s" % (
            list(x), list(y), ls, w, label)

    assert (func_replace_all(None, "a", "b", w="x", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func_replace_all(None, x="a", y="b", w="x", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: b")
    assert (func_replace_all(None, "a", "b", w="x", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (
        func_replace_all(None, "a", "b", w="x", label="text", data=data) ==
        "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")
    assert (
        func_replace_all(None, x="a", y="b", w="x", label="", data=data) ==
        "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (
        func_replace_all(None, x="a", y="b", w="x", label="text", data=data) ==
        "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")


def test_no_label_replacements():
    """Test with "label_namer=None" -> no label replacement at all."""

    @_preprocess_data(replace_names=["x", "y"], label_namer=None)
    def func_no_label(ax, x, y, ls="x", label=None, w="xyz"):
        return "x: %s, y: %s, ls: %s, w: %s, label: %s" % (
            list(x), list(y), ls, w, label)

    data = {"a": [1, 2], "b": [8, 9], "w": "NOT"}
    assert (func_no_label(None, "a", "b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: None")
    assert (func_no_label(None, x="a", y="b", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: None")
    assert (func_no_label(None, "a", "b", label="", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: ")
    assert (func_no_label(None, "a", "b", label="text", data=data) ==
            "x: [1, 2], y: [8, 9], ls: x, w: xyz, label: text")


def test_more_args_than_pos_parameter():
    @_preprocess_data(replace_names=["x", "y"], label_namer="y")
    def func(ax, x, y, z=1):
        pass

    data = {"a": [1, 2], "b": [8, 9], "w": "NOT"}
    with pytest.raises(TypeError):
        func(None, "a", "b", "z", "z", data=data)


def test_docstring_addition():
    @_preprocess_data()
    def funcy(ax, *args, **kwargs):
        """
        Parameters
        ----------
        data : indexable object, optional
            DATA_PARAMETER_PLACEHOLDER
        """

    assert re.search(r"all parameters also accept a string", funcy.__doc__)
    assert not re.search(r"the following parameters", funcy.__doc__)

    @_preprocess_data(replace_names=[])
    def funcy(ax, x, y, z, bar=None):
        """
        Parameters
        ----------
        data : indexable object, optional
            DATA_PARAMETER_PLACEHOLDER
        """

    assert not re.search(r"all parameters also accept a string", funcy.__doc__)
    assert not re.search(r"the following parameters", funcy.__doc__)

    @_preprocess_data(replace_names=["bar"])
    def funcy(ax, x, y, z, bar=None):
        """
        Parameters
        ----------
        data : indexable object, optional
            DATA_PARAMETER_PLACEHOLDER
        """

    assert not re.search(r"all parameters also accept a string", funcy.__doc__)
    assert not re.search(r"the following parameters .*: \*bar\*\.",
                         funcy.__doc__)

    @_preprocess_data(replace_names=["x", "t"])
    def funcy(ax, x, y, z, t=None):
        """
        Parameters
        ----------
        data : indexable object, optional
            DATA_PARAMETER_PLACEHOLDER
        """

    assert not re.search(r"all parameters also accept a string", funcy.__doc__)
    assert not re.search(r"the following parameters .*: \*x\*, \*t\*\.",
                         funcy.__doc__)


def test_data_parameter_replacement():
    """
    Test that the docstring contains the correct *data* parameter stub
    for all methods that we run _preprocess_data() on.
    """
    program = (
        "import logging; "
        "logging.basicConfig(level=logging.DEBUG); "
        "import matplotlib.pyplot as plt"
    )
    cmd = [sys.executable, "-c", program]
    completed_proc = subprocess.run(cmd, text=True, capture_output=True)
    assert 'data parameter docstring error' not in completed_proc.stderr


class TestPlotTypes:

    plotters = [Axes.scatter, Axes.bar, Axes.plot]

    @pytest.mark.parametrize('plotter', plotters)
    @check_figures_equal(extensions=['png'])
    def test_dict_unpack(self, plotter, fig_test, fig_ref):
        x = [1, 2, 3]
        y = [4, 5, 6]
        ddict = dict(zip(x, y))

        plotter(fig_test.subplots(),
                ddict.keys(), ddict.values())
        plotter(fig_ref.subplots(), x, y)

    @pytest.mark.parametrize('plotter', plotters)
    @check_figures_equal(extensions=['png'])
    def test_data_kwarg(self, plotter, fig_test, fig_ref):
        x = [1, 2, 3]
        y = [4, 5, 6]

        plotter(fig_test.subplots(), 'xval', 'yval',
                data={'xval': x, 'yval': y})
        plotter(fig_ref.subplots(), x, y)
