#!/usr/bin/env python
#
# Copyright (c) 2013 Eric Romano (@gelstudios)
# released under The MIT license (MIT) http://opensource.org/licenses/MIT
#
"""
gitfiti

noun : Carefully crafted graffiti in a GitHub commit history calendar
"""

from datetime import datetime, timedelta
import itertools
import json
import math
import os
try:
    # Python 3+
    from urllib.error import HTTPError, URLError
    from urllib.request import urlopen
except ImportError:
    # Python 2
    from urllib2 import HTTPError, URLError, urlopen

try:
    # Python 2
    raw_input
except NameError:
    # Python 3 (Python 2's `raw_input` was renamed to `input`)
    raw_input = input


GITHUB_BASE_URL = 'https://github.com/'
FALLBACK_IMAGE = 'kitty'


TITLE = '''
          _ __  _____ __  _
   ____ _(_) /_/ __(_) /_(_)
  / __ `/ / __/ /_/ / __/ /
 / /_/ / / /_/ __/ / /_/ /
 \__, /_/\__/_/ /_/\__/_/
/____/
'''


KITTY = [
  [0,0,0,4,0,0,0,0,4,0,0,0],
  [0,0,4,2,4,4,4,4,2,4,0,0],
  [0,0,4,2,2,2,2,2,2,4,0,0],
  [2,2,4,2,4,2,2,4,2,4,2,2],
  [0,0,4,2,2,3,3,2,2,4,0,0],
  [2,2,4,2,2,2,2,2,2,4,2,2],
  [0,0,0,3,4,4,4,4,3,0,0,0],
]

ONEUP = [
  [0,4,4,4,4,4,4,4,0],
  [4,3,2,2,1,2,2,3,4],
  [4,2,2,1,1,1,2,2,4],
  [4,3,4,4,4,4,4,3,4],
  [4,4,1,4,1,4,1,4,4],
  [0,4,1,1,1,1,1,4,0],
  [0,0,4,4,4,4,4,0,0],
]

ONEUP2 = [
  [0,0,4,4,4,4,4,4,4,0,0],
  [0,4,2,2,1,1,1,2,2,4,0],
  [4,3,2,2,1,1,1,2,2,3,4],
  [4,3,3,4,4,4,4,4,3,3,4],
  [0,4,4,1,4,1,4,1,4,4,0],
  [0,0,4,1,1,1,1,1,4,0,0],
  [0,0,0,4,4,4,4,4,0,0,0],
]

HACKERSCHOOL = [
  [4,4,4,4,4,4],
  [4,3,3,3,3,4],
  [4,1,3,3,1,4],
  [4,3,3,3,3,4],
  [4,4,4,4,4,4],
  [0,0,4,4,0,0],
  [4,4,4,4,4,4],
]

OCTOCAT = [
  [0,0,0,4,0,0,0,4,0],
  [0,0,4,4,4,4,4,4,4],
  [0,0,4,1,3,3,3,1,4],
  [4,0,3,4,3,3,3,4,3],
  [0,4,0,0,4,4,4,0,0],
  [0,0,4,4,4,4,4,4,4],
  [0,0,4,0,4,0,4,0,4],
]

OCTOCAT2 = [
  [0,0,4,0,0,4,0],
  [0,4,4,4,4,4,4],
  [0,4,1,3,3,1,4],
  [0,4,4,4,4,4,4],
  [4,0,0,4,4,0,0],
  [0,4,4,4,4,4,0],
  [0,0,0,4,4,4,0],
]

HELLO = [
  [0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,4],
  [0,2,0,0,0,0,0,0,0,2,0,2,0,0,0,0,0,4],
  [0,3,3,3,0,2,3,3,0,3,0,3,0,1,3,1,0,3],
  [0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,3],
  [0,3,0,3,0,3,3,3,0,3,0,3,0,3,0,3,0,2],
  [0,2,0,2,0,2,0,0,0,2,0,2,0,2,0,2,0,0],
  [0,1,0,1,0,1,1,1,0,1,0,1,0,1,1,1,0,4],
]

HEART1 = [
  [0,1,1,0,1,1,0],
  [1,3,3,1,3,3,1],
  [1,3,4,3,4,3,1],
  [1,3,4,4,4,3,1],
  [0,1,3,4,3,1,0],
  [0,0,1,3,1,0,0],
  [0,0,0,1,0,0,0],        
]

HEART2 = [
  [0,5,5,0,5,5,0],
  [5,3,3,5,3,3,5],
  [5,3,1,3,1,3,5],
  [5,3,1,1,1,3,5],
  [0,5,3,1,3,5,0],
  [0,0,5,3,5,0,0],
  [0,0,0,5,0,0,0],        
]

HIREME = [
  [1,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  [2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  [3,3,3,0,2,0,3,3,3,0,2,3,3,0,0,3,3,0,3,0,0,2,3,3],
  [4,0,4,0,4,0,4,0,0,0,4,0,4,0,0,4,0,4,0,4,0,4,0,4],
  [3,0,3,0,3,0,3,0,0,0,3,3,3,0,0,3,0,3,0,3,0,3,3,3],
  [2,0,2,0,2,0,2,0,0,0,2,0,0,0,0,2,0,2,0,2,0,2,0,0],
  [1,0,1,0,1,0,1,0,0,0,1,1,1,0,0,1,0,1,0,1,0,1,1,1],
]

BEER = [
  [0,0,0,0,0,0,0,3,3,3,0,0,3,3,3,0,3,3,3,0,3,3,3,0,0],
  [0,0,1,1,1,1,0,3,0,0,3,0,3,0,0,0,3,0,0,0,3,0,0,3,0],
  [0,2,2,2,2,2,0,3,0,0,3,0,3,0,0,0,3,0,0,0,3,0,0,3,0],
  [2,0,2,2,2,2,0,3,3,3,0,0,3,3,3,0,3,3,3,0,3,3,3,0,0],
  [2,0,2,2,2,2,0,3,0,0,3,0,3,0,0,0,3,0,0,0,3,0,3,0,0],
  [0,2,2,2,2,2,0,3,0,0,3,0,3,0,0,0,3,0,0,0,3,0,0,3,0],
  [0,0,2,2,2,2,0,3,3,3,0,0,3,3,3,0,3,3,3,0,3,0,0,3,0],
]

GLIDERS = [
  [0,0,0,4,0,4,0,0,0,0,4,0,0,0],
  [0,4,0,4,0,0,4,4,0,0,0,4,0,0],
  [0,0,4,4,0,4,4,0,0,4,4,4,0,0],
  [0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  [0,4,0,4,0,0,0,4,0,0,0,0,0,0],
  [0,0,4,4,0,4,0,4,0,0,0,0,0,0],
  [0,0,4,0,0,0,4,4,0,0,0,0,0,0],
]

HEART = [
  [0,4,4,0,4,4,0],
  [4,2,2,4,2,2,4],
  [4,2,2,2,2,2,4],
  [4,2,2,2,2,2,4],
  [0,4,2,2,2,4,0],
  [0,0,4,2,4,0,0],
  [0,0,0,4,0,0,0],
]

HEART_SHINY = [
  [0,4,4,0,4,4,0],
  [4,2,0,4,2,2,4],
  [4,0,2,2,2,2,4],
  [4,2,2,2,2,2,4],
  [0,4,2,2,2,4,0],
  [0,0,4,2,4,0,0],
  [0,0,0,4,0,0,0],
]

ASCII_TO_NUMBER = {
  '_': 0,
  '_': 1,
  '~': 2,
  '=': 3,
  '*': 4,
}


def str_to_sprite(content):
    # Break out lines and filter any excess
    lines = content.split('\n')
    def is_empty_line(line):
        return len(line) != 0
    lines = filter(is_empty_line, lines)

    # Break up lines into each character
    split_lines = [list(line) for line in lines]

    # Replace each character with its numeric equivalent
    for line in split_lines:
        for index, char in enumerate(line):
            line[index] = ASCII_TO_NUMBER.get(char, 0)

    # Return the formatted str
    return split_lines


ONEUP_STR = str_to_sprite('''
 *******
*=~~-~~=*
*~~---~~*
*=*****=*
**-*-*-**
 *-----*
  *****
''')


IMAGES = {
  'kitty': KITTY,
  'oneup': ONEUP,
  'oneup2': ONEUP2,
  'hackerschool': HACKERSCHOOL,
  'octocat': OCTOCAT,
  'octocat2': OCTOCAT2,
  'hello': HELLO,
  'heart1': HEART1,
  'heart2': HEART2,
  'hireme': HIREME,
  'oneup_str': ONEUP_STR,
  'beer': BEER,
  'gliders': GLIDERS,
  'heart' : HEART, 
  'heart_shiny' : HEART_SHINY,
}

SHELLS = {
  'bash': 'sh',
  'powershell': 'ps1',
}

def load_images(img_names):
    """loads user images from given file(s)"""
    if img_names[0] == '':
        return {}

    for image_name in img_names:
        with open(image_name) as img:
            loaded_imgs = {}
            img_list = ''
            img_line = ' '
            name = img.readline().replace('\n', '')
            name = name[1:]

            while True:
                img_line = img.readline()
                if img_line == '':
                    break

                img_line.replace('\n', '')
                if img_line[0] == ':':
                    loaded_imgs[name] = json.loads(img_list)
                    name = img_line[1:]
                    img_list = ''
                else:
                    img_list += img_line

            loaded_imgs[name] = json.loads(img_list)

            return loaded_imgs


def retrieve_contributions_calendar(username, base_url):
    """retrieves the GitHub commit calendar data for a username"""
    base_url = base_url + 'users/' + username

    try:
        url = base_url + '/contributions'
        page = urlopen(url)
    except (HTTPError, URLError) as e:
        print('There was a problem fetching data from {0}'.format(url))
        print(e)
        raise SystemExit

    return page.read().decode('utf-8')


def parse_contributions_calendar(contributions_calendar):
    """Yield daily counts extracted from the embedded contributions SVG."""
    for line in contributions_calendar.splitlines():
        # a valid line looks like this:
        # <rect width="11" height="11" x="-31" y="0" class="ContributionCalendar-day" data-date="2023-02-26" data-level="3" rx="2" ry="2">23 contributions on Sunday, February 26, 2023</rect>
        if 'data-date=' in line:
            commit = line.split('>')[1].split()[0] # yuck

            if commit.isnumeric():
                yield int(commit)


def find_max_daily_commits(contributions_calendar):
    """finds the highest number of commits in one day"""
    daily_counts = parse_contributions_calendar(contributions_calendar)
    return max(daily_counts, default=0)


def calculate_multiplier(max_commits):
    """calculates a multiplier to scale GitHub colors to commit history"""
    m = max_commits / 4.0

    if m == 0:
        return 1

    m = math.ceil(m)
    m = int(m)
    return m


def get_start_date():
    """returns a datetime object for the first sunday after one year ago today
    at 12:00 noon"""
    today = datetime.today()
    date = datetime(today.year - 1, today.month, today.day, 12)
    weekday = datetime.weekday(date)

    while weekday < 6:
        date = date + timedelta(1)
        weekday = datetime.weekday(date)

    return date


def generate_next_dates(start_date, offset=0):
    """generator that returns the next date, requires a datetime object as
    input. The offset is in weeks"""
    start = offset * 7
    for i in itertools.count(start):
        yield start_date + timedelta(i)


def generate_values_in_date_order(image, multiplier=1):
    height = 7
    width = len(image[0])

    for w in range(width):
        for h in range(height):
            yield image[h][w] * multiplier


def commit(commitdate, shell):
    template_bash = (
        '''GIT_AUTHOR_DATE={0} GIT_COMMITTER_DATE={1} '''
        '''git commit --allow-empty -m "gitfiti" > /dev/null\n'''
    )
    
    template_powershell = (
        '''$Env:GIT_AUTHOR_DATE="{0}"\n$Env:GIT_COMMITTER_DATE="{1}"\n'''
        '''git commit --allow-empty -m "gitfiti" | Out-Null\n'''
    )

    template = template_bash if shell == 'bash' else template_powershell

    return template.format(commitdate.isoformat(), commitdate.isoformat())


def fake_it(image, start_date, username, repo, git_url, shell, offset=0, multiplier=1):
    template_bash = (
        '#!/usr/bin/env bash\n'
        'REPO={0}\n'
        'git init $REPO\n'
        'cd $REPO\n'
        'touch README.md\n'
        'git add README.md\n'
        'touch gitfiti\n'
        'git add gitfiti\n'
        '{1}\n'
        'git branch -M main\n'
        'git remote add origin {2}:{3}/$REPO.git\n'
        'git pull origin main\n'
        'git push -u origin main\n'
    )

    template_powershell = (
        'cd $PSScriptRoot\n'
        '$REPO="{0}"\n'
        'git init $REPO\n'
        'cd $REPO\n'
        'New-Item README.md -ItemType file | Out-Null\n'
        'git add README.md\n'
        'New-Item gitfiti -ItemType file | Out-Null\n'
        'git add gitfiti\n'
        '{1}\n'
        'git branch -M main\n'
        'git remote add origin {2}:{3}/$REPO.git\n'
        'git pull origin main\n'
        'git push -u origin main\n'
    )

    template = template_bash if shell == 'bash' else template_powershell

    strings = []
    for value, date in zip(generate_values_in_date_order(image, multiplier),
            generate_next_dates(start_date, offset)):
        for _ in range(value):
            strings.append(commit(date, shell))

    return template.format(repo, ''.join(strings), git_url, username)


def save(output, filename):
    """Saves the list to a given filename"""
    with open(filename, 'w') as f:
        f.write(output)
    os.chmod(filename, 0o755) # add execute permissions


def request_user_input(prompt='> '):
    """Request input from the user and return what has been entered."""
    return raw_input(prompt)


def main():
    print(TITLE)

    ghe = request_user_input(
        'Enter GitHub URL (leave blank to use {}): '.format(GITHUB_BASE_URL))

    username = request_user_input('Enter your GitHub username: ')

    git_base = ghe if ghe else GITHUB_BASE_URL

    contributions_calendar = retrieve_contributions_calendar(username, git_base)

    max_daily_commits = find_max_daily_commits(contributions_calendar)

    m = calculate_multiplier(max_daily_commits)

    repo = request_user_input(
        'Enter the name of the repository to use by gitfiti: ')

    offset = request_user_input(
        'Enter the number of weeks to offset the image (from the left): ')

    offset = int(offset) if offset.strip() else 0

    print((
        'By default gitfiti.py matches the darkest pixel to the highest\n'
        'number of commits found in your GitHub commit/activity calendar,\n'
        '\n'
        'Currently this is: {0} commits\n'
        '\n'
        'Enter the word "gitfiti" to exceed your max\n'
        '(this option generates WAY more commits)\n'
        'Any other input will cause the default matching behavior'
    ).format(max_daily_commits))
    match = request_user_input()

    match = m if (match == 'gitfiti') else 1

    print('Enter file(s) to load images from (blank if not applicable)')
    img_names = request_user_input().split(' ')

    loaded_images = load_images(img_names)
    images = dict(IMAGES, **loaded_images)

    print('Enter the image name to gitfiti')
    print('Images: ' + ', '.join(images.keys()))
    image = request_user_input()

    image_name_fallback = FALLBACK_IMAGE

    if not image:
        image = IMAGES[image_name_fallback]
    else:
        try:
            image = images[image]
        except:
            image = IMAGES[image_name_fallback]

    start_date = get_start_date()
    fake_it_multiplier = m * match

    if not ghe:
        git_url = 'git@github.com'
    else:
        git_url = request_user_input('Enter Git URL like git@site.github.com: ')
        
    shell = ''
    while shell not in SHELLS.keys(): 
        shell = request_user_input(
            'Enter the target shell ({}): '.format(' or '.join(SHELLS.keys())))

    output = fake_it(image, start_date, username, repo, git_url, shell, offset,
                     fake_it_multiplier)

    output_filename = 'gitfiti.{}'.format(SHELLS[shell])
    save(output, output_filename)
    print('{} saved.'.format(output_filename))
    print('Create a new(!) repo named {0} at {1} and run the script'.format(repo, git_base))


if __name__ == '__main__':
    main()