import copy
import json
import os
import subprocess
from datetime import datetime

import matplotlib as mpl
from matplotlib import dates as mdates
from matplotlib import pyplot as plt

mpl.rcParams['figure.dpi'] = 125
mpl.rcParams['hatch.linewidth'] = 4.0

root_process = subprocess.run(
    ['git', 'rev-parse', '--show-toplevel'], stdout=subprocess.PIPE
)
ROOT = root_process.stdout.decode('utf-8')[:-1]
DATA = os.path.join(ROOT, 'repos', 'dotfiles', 'dot-stats', 'history.json')
PICS_ROOT = os.path.join(ROOT, 'static', 'stats')
CAT_W = 0.3

plt.style.use(os.path.join(ROOT, 'scripts', 'palenight.mplstyle'))

COLORS = {
    'k': '#292d3e',
    'r': '#f07178',
    'g': '#c3e88d',
    'y': '#ffcb6b',
    'b': '#82aaff',
    'm': '#c792ea',
    'c': '#89ddff',
    'w': '#d0d0d0',
    'k-l': '#434758',
    'r-l': '#ff8b92',
    'g-l': '#ddffa7',
    'y-l': '#ffe585',
    'b-l': '#9cc4ff',
    'm-l': '#e1acff',
    'c-l': '#a3f7ff',
    'w-l': '#ffffff'
}

with open(DATA, 'r') as f:
    data_o = json.load(f)


def preprocess_data(data):
    data = copy.deepcopy(data)
    for category in data:
        for elem in category['elements']:
            for state in elem['states']:
                if 'TODO' in state['startDate']:
                    print(f'TODO in {elem["name"]} (startDate)')
                    state['startDate'] = state['startDate'].replace('TODO',
                                                                    '').strip()
                state['startDate'] = datetime.strptime(
                    state['startDate'], '%Y-%m-%d'
                )
                try:
                    if 'TODO' in state['endDate']:
                        print(f'TODO in {elem["name"]} (endDate)')
                        state['endDate'] = state['endDate'].replace('TODO',
                                                                    '').strip()
                    state['endDate'] = datetime.strptime(
                        state['endDate'], '%Y-%m-%d'
                    )
                except KeyError:
                    state['endDate'] = datetime.today()
                try:
                    state['hatchColor'] = COLORS.get(
                        state['hatchColor'], state['hatchColor']
                    )
                except KeyError:
                    pass
            elem['states'].sort(key=lambda k: k['startDate'])
            try:
                elem['color'] = COLORS.get(elem['color'], elem['color'])
            except KeyError:
                pass
        category['elements'].sort(key=lambda k: k['states'][0]['startDate'])

    return data


def crop_data(data, start_date):
    data = copy.deepcopy(data)
    for category in data:
        for elem in category['elements']:
            elem['states'] = [
                state
                for state in elem['states'] if state['endDate'] >= start_date
            ]
            for state in elem['states']:
                if state['startDate'] <= start_date:
                    state['startDate'] = start_date

        category['elements'] = [
            element
            for element in category['elements'] if len(element['states']) > 0
        ]

    data = [category for category in data if len(category['elements']) > 0]
    return data


def process_category(category, ax, is_last=True, notes=None):
    ticks = list(range(0, -len(category['elements']), -1))
    if notes is None:
        notes = []
    min_start_date = 10**9
    for elem, k in zip(category['elements'], ticks):
        for state in elem['states']:
            start_date, end_date = mdates.date2num(
                state['startDate']
            ), mdates.date2num(state['endDate'])
            min_start_date = min(min_start_date, start_date)
            kwargs = {}
            kwargs['color'] = elem.get('color', None)

            if state.get('state', None) == 'dashed':
                kwargs['hatch'] = '//'
                kwargs['edgecolor'] = state.get('hatchColor', 'y')
                kwargs['lw'] = 0

                note = state.get('note', None)
                if note is not None:
                    notes.append(note)
                    stars = '*' * len(notes)
                    ax.text(end_date, k + CAT_W * 0.7, stars, size=15)

            bars = ax.broken_barh(
                [(start_date, end_date - start_date)], (k - CAT_W, CAT_W * 2),
                **kwargs
            )

    ax.set_yticks(ticks)
    ax.set_yticklabels([elem['name'] for elem in category['elements']])
    ax.set_axisbelow(True)
    ax.grid(True, alpha=0.25)
    if not is_last:
        ax.tick_params(axis='x', which='both', labelbottom=False, length=0)
    else:
        ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m'))

    return notes


def plot_notes(fig, ax, notes, x=0.9, y=0.03):
    if len(notes) > 0:
        notes_text = ''
        for i, note in enumerate(notes):
            notes_text += '*' * (i + 1) + ' ' + note + '\n'
        ax.text(
            x, y, notes_text, transform=fig.transFigure, va='top', ha='right'
        )


def plot_all(data):
    fig, axes = plt.subplots(
        len(data),
        gridspec_kw={
            'height_ratios': [len(datum['elements']) for datum in data]
        },
        figsize=(14, 11),
        sharex=True
    )
    notes = []
    for i, [datum, ax] in enumerate(zip(data, axes)):
        is_last = i == len(data) - 1
        notes = process_category(datum, ax, is_last=is_last, notes=notes)
        ax.yaxis.set_label_position("right")
        ax.set_ylabel(datum['title'], labelpad=16, rotation=270)
    plot_notes(fig, ax, notes, y=0.07, x=0.95)
    # fig.tight_layout()
    fig.subplots_adjust(hspace=0.15)
    ax.text(
        0.075,
        0.06,
        f'upd. {datetime.now().strftime("%Y-%m-%d")}',
        transform=fig.transFigure,
        va='top',
        ha='left'
    )
    return fig


data = preprocess_data(data_o)
data = crop_data(data, datetime(2017, 1, 1))
fig = plot_all(data)
plt.tight_layout()
fig.savefig(os.path.join(PICS_ROOT, 'all.png'))