import evaluate
import json
import sys
from pathlib import Path
import gradio as gr

import numpy as np
import pandas as pd
import ast

# from ece import ECE  # loads local instead


import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

"""
import seaborn as sns
sns.set_style('white')
sns.set_context("paper", font_scale=1)
"""
# plt.rcParams['figure.figsize'] = [10, 7]
plt.rcParams["figure.dpi"] = 300
plt.switch_backend(
    "agg"
)  # ; https://stackoverflow.com/questions/14694408/runtimeerror-main-thread-is-not-in-main-loop

sliders = [
    gr.Slider(0, 100, value=10, label="n_bins"),
    gr.Slider(
        0, 100, value=None, label="bin_range", visible=False
    ),  # DEV: need to have a double slider
    gr.Dropdown(choices=["equal-range", "equal-mass"], value="equal-range", label="scheme"),
    gr.Dropdown(choices=["upper-edge", "center"], value="upper-edge", label="proxy"),
    gr.Dropdown(choices=[1, 2, np.inf], value=1, label="p"),
]

slider_defaults = [slider.value for slider in sliders]

# example data
df = dict()
df["predictions"] = [[0.6, 0.2, 0.2], [0, 0.95, 0.05], [0.7, 0.1, 0.2]]
df["references"] = [0, 1, 2]

component = gr.inputs.Dataframe(
    headers=["predictions", "references"], col_count=2, datatype="number", type="pandas"
)

component.value = [
    [[0.6, 0.2, 0.2], 0],
    [[0.7, 0.1, 0.2], 2],
    [[0, 0.95, 0.05], 1],
]
sample_data = [[component] + slider_defaults]  ##json.dumps(df)


local_path = Path(sys.path[0])
metric = evaluate.load("jordyvl/ece")
# ECE()
# module = evaluate.load("jordyvl/ece")
# launch_gradio_widget(module)

"""l
Switch inputs and compute_fn
"""


def default_plot():
    fig = plt.figure()
    ax1 = plt.subplot2grid((3, 1), (0, 0), rowspan=2)
    ax2 = plt.subplot2grid((3, 1), (2, 0))
    ranged = np.linspace(0, 1, 10)
    ax1.plot(
        ranged,
        ranged,
        color="darkgreen",
        ls="dotted",
        label="Perfect",
    )

    # Bin differences
    ax1.set_ylabel("Conditional Expectation")
    ax1.set_ylim([0, 1.05])  # respective to bin range
    ax1.set_title("Reliability Diagram")
    ax1.set_xlim([-0.05, 1.05])  # respective to bin range

    # Bin frequencies
    ax2.set_xlabel("Confidence")
    ax2.set_ylabel("Count")
    ax2.legend(loc="upper left")  # , ncol=2
    ax2.set_xlim([-0.05, 1.05])  # respective to bin range

    return fig, ax1, ax2


def reliability_plot(results):
    # DEV: might still need to write tests in case of equal mass binning
    # DEV: nicer would be to plot like a polygon
    # see: https://github.com/markus93/fit-on-the-test/blob/main/Experiments_Synthetic/binnings.py

    def over_under_confidence(results):
        colors = []
        for j, bin in enumerate(results["y_bar"]):
            perfect = results["y_bar"][j]
            empirical = results["p_bar"][j]

            bin_color = (
                "limegreen"
                if np.allclose(perfect, empirical)
                else "dodgerblue"
                if empirical < perfect
                else "orangered"
            )
            colors.append(bin_color)
        return colors

    fig, ax1, ax2 = default_plot()

    # Bin differences
    bins_with_left_edge = np.insert(results["y_bar"], 0, 0, axis=0)
    B, bins, patches = ax1.hist(
        results["y_bar"],
        weights=np.nan_to_num(results["p_bar"][:-1], copy=True, nan=0),
        bins=bins_with_left_edge,
    )
    colors = over_under_confidence(results)
    for b in range(len(B)):
        patches[b].set_facecolor(colors[b])  # color based on over/underconfidence

    ax1handles = [
        mpatches.Patch(color="orangered", label="Overconfident"),
        mpatches.Patch(color="limegreen", label="Perfect", linestyle="dotted"),
        mpatches.Patch(color="dodgerblue", label="Underconfident"),
    ]

    # Bin frequencies
    anindices = np.where(~np.isnan(results["p_bar"][:-1]))[0]
    n_bins = len(results["y_bar"])
    bin_freqs = np.zeros(n_bins)
    bin_freqs[anindices] = results["bin_freq"]
    B, newbins, patches = ax2.hist(
        results["y_bar"], weights=bin_freqs, color="midnightblue", bins=bins_with_left_edge
    )

    acc_plt = ax2.axvline(x=results["accuracy"], ls="solid", lw=3, c="black", label="Accuracy")
    conf_plt = ax2.axvline(
        x=results["p_bar_cont"], ls="dotted", lw=3, c="#444", label="Avg. confidence"
    )

    ax1.legend(loc="lower right", handles=ax1handles)
    ax2.legend(handles=[acc_plt, conf_plt])
    ax1.set_xticks(bins_with_left_edge)
    ax2.set_xticks(bins_with_left_edge)
    plt.tight_layout()
    return fig


def compute_and_plot(data, n_bins, bin_range, scheme, proxy, p):
    # DEV: check on invalid datatypes with better warnings

    if isinstance(data, pd.DataFrame):
        data.dropna(inplace=True)

    predictions = [
        ast.literal_eval(prediction) if not isinstance(prediction, list) else prediction
        for prediction in data["predictions"]
    ]
    references = [reference for reference in data["references"]]

    results = metric._compute(
        predictions,
        references,
        n_bins=n_bins,
        scheme=scheme,
        proxy=proxy,
        p=p,
        detail=True,
    )
    print(results)
    plot = reliability_plot(results)
    return results["ECE"], plot


outputs = [gr.outputs.Textbox(label="ECE"), gr.Plot(label="Reliability diagram")]
# outputs[1].value = default_plot().__dict__ #Does not work; yet needs to be JSON encoded

iface = gr.Interface(
    fn=compute_and_plot,
    inputs=[component] + sliders,
    outputs=outputs,
    description=metric.info.description,
    article=evaluate.utils.parse_readme(local_path / "README.md"),
    title=f"Metric: {metric.name}",
    # examples=sample_data; # ValueError: Examples argument must either be a directory or a nested list, where each sublist represents a set of inputs.
).launch()