#!/usr/bin/env python3
# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>

import argparse
import io
import json
import mimetypes
import os
import pprint
import re
import shlex
import subprocess
import sys
import time

import requests

os.chdir(os.path.dirname(os.path.abspath(__file__)))
build_path = os.path.abspath('../build-kitty')
raw = open('kitty/constants.py').read()
nv = re.search(
    r'^version\s+=\s+\((\d+), (\d+), (\d+)\)', raw, flags=re.MULTILINE)
version = '%s.%s.%s' % (nv.group(1), nv.group(2), nv.group(3))
appname = re.search(
    r"^appname\s+=\s+'([^']+)'", raw, flags=re.MULTILINE).group(1)

ALL_ACTIONS = 'build tag upload'.split()


def call(*cmd):
    if len(cmd) == 1:
        cmd = shlex.split(cmd[0])
    ret = subprocess.Popen(cmd).wait()
    if ret != 0:
        raise SystemExit(ret)


def run_build(args):
    os.chdir(build_path)
    call('./osx kitty --sign-installers')
    call('./osx shutdown')


def run_tag(args):
    call('git push')
    call('git tag -s v{0} -m version-{0}'.format(version))
    call('git push origin v{0}'.format(version))


class ReadFileWithProgressReporting(io.BufferedReader):  # {{{
    def __init__(self, path, mode='rb'):
        io.BufferedReader.__init__(self, open(path, mode))
        self.seek(0, os.SEEK_END)
        self._total = self.tell()
        self.seek(0)
        self.start_time = time.time()

    def __len__(self):
        return self._total

    def read(self, size):
        data = io.BufferedReader.read(self, size)
        if data:
            self.report_progress(len(data))
        return data

    def report_progress(self, size):
        def write(*args):
            print(*args, end='')

        write('\x1b[s\x1b[K')
        frac = float(self.tell()) / self._total
        mb_pos = self.tell() / float(1024**2)
        mb_tot = self._total / float(1024**2)
        kb_pos = self.tell() / 1024.0
        kb_rate = kb_pos / (time.time() - self.start_time)
        bit_rate = kb_rate * 1024
        eta = int((self._total - self.tell()) / bit_rate) + 1
        eta_m, eta_s = eta / 60, eta % 60
        write(
            '  %.1f%%   %.1f/%.1fMB %.1f KB/sec    %d minutes, %d seconds left'
            % (frac * 100, mb_pos, mb_tot, kb_rate, eta_m, eta_s))
        write('\x1b[u')
        if self.tell() >= self._total:
            t = int(time.time() - self.start_time) + 1
            print('\nUpload took %d minutes and %d seconds at %.1f KB/sec' %
                  (t / 60, t % 60, kb_rate))
        sys.stdout.flush()


# }}}


class Base(object):  # {{{
    def __init__(self):
        self.d = os.path.dirname
        self.j = os.path.join
        self.a = os.path.abspath
        self.b = os.path.basename
        self.s = os.path.splitext
        self.e = os.path.exists

    def info(self, *args, **kwargs):
        print(*args, **kwargs)
        sys.stdout.flush()

    def warn(self, *args, **kwargs):
        print('\n' + '_' * 20, 'WARNING', '_' * 20)
        print(*args, **kwargs)
        print('_' * 50)
        sys.stdout.flush()


# }}}


class GitHub(Base):  # {{{

    API = 'https://api.github.com/'

    def __init__(self,
                 files,
                 reponame,
                 version,
                 username,
                 password,
                 replace=False):
        self.files, self.reponame, self.version, self.username, self.password, self.replace = (
            files, reponame, version, username, password, replace)
        self.current_tag_name = 'v' + self.version
        self.requests = s = requests.Session()
        s.auth = (self.username, self.password)
        s.headers.update({'Accept': 'application/vnd.github.v3+json'})

    def __call__(self):
        releases = self.releases()
        # self.clean_older_releases(releases)
        release = self.create_release(releases)
        upload_url = release['upload_url'].partition('{')[0]
        existing_assets = self.existing_assets(release['id'])
        for path, desc in self.files.items():
            self.info('')
            url = self.API + 'repos/%s/%s/releases/assets/{}' % (self.username,
                                                                 self.reponame)
            fname = os.path.basename(path)
            if fname in existing_assets:
                self.info('Deleting %s from GitHub with id: %s' %
                          (fname, existing_assets[fname]))
                r = self.requests.delete(url.format(existing_assets[fname]))
                if r.status_code != 204:
                    self.fail(r, 'Failed to delete %s from GitHub' % fname)
            r = self.do_upload(upload_url, path, desc, fname)
            if r.status_code != 201:
                self.fail(r, 'Failed to upload file: %s' % fname)
            try:
                r = self.requests.patch(
                    url.format(r.json()['id']),
                    data=json.dumps({
                        'name': fname,
                        'label': desc
                    }))
            except Exception:
                time.sleep(15)
                r = self.requests.patch(
                    url.format(r.json()['id']),
                    data=json.dumps({
                        'name': fname,
                        'label': desc
                    }))
            if r.status_code != 200:
                self.fail(r, 'Failed to set label for %s' % fname)

    def clean_older_releases(self, releases):
        for release in releases:
            if release.get(
                    'assets',
                    None) and release['tag_name'] != self.current_tag_name:
                self.info('\nDeleting old released installers from: %s' %
                          release['tag_name'])
                for asset in release['assets']:
                    r = self.requests.delete(
                        self.API + 'repos/%s/%s/releases/assets/%s' % (
                            self.username, self.reponame, asset['id']))
                    if r.status_code != 204:
                        self.fail(
                            r,
                            'Failed to delete obsolete asset: %s for release: %s'
                            % (asset['name'], release['tag_name']))

    def do_upload(self, url, path, desc, fname):
        mime_type = mimetypes.guess_type(fname)[0]
        self.info('Uploading to GitHub: %s (%s)' % (fname, mime_type))
        with ReadFileWithProgressReporting(path) as f:
            return self.requests.post(
                url,
                headers={
                    'Content-Type': mime_type,
                    'Content-Length': str(f._total)
                },
                params={'name': fname},
                data=f)

    def fail(self, r, msg):
        print(msg, ' Status Code: %s' % r.status_code, file=sys.stderr)
        print("JSON from response:", file=sys.stderr)
        pprint.pprint(dict(r.json()), stream=sys.stderr)
        raise SystemExit(1)

    def already_exists(self, r):
        error_code = r.json().get('errors', [{}])[0].get('code', None)
        return error_code == 'already_exists'

    def existing_assets(self, release_id):
        url = self.API + 'repos/%s/%s/releases/%s/assets' % (
            self.username, self.reponame, release_id)
        r = self.requests.get(url)
        if r.status_code != 200:
            self.fail('Failed to get assets for release')
        return {asset['name']: asset['id'] for asset in r.json()}

    def releases(self):
        url = self.API + 'repos/%s/%s/releases' % (self.username, self.reponame
                                                   )
        r = self.requests.get(url)
        if r.status_code != 200:
            self.fail(r, 'Failed to list releases')
        return r.json()

    def create_release(self, releases):
        ' Create a release on GitHub or if it already exists, return the existing release '
        for release in releases:
            # Check for existing release
            if release['tag_name'] == self.current_tag_name:
                return release
        url = self.API + 'repos/%s/%s/releases' % (self.username, self.reponame
                                                   )
        r = self.requests.post(
            url,
            data=json.dumps({
                'tag_name': self.current_tag_name,
                'target_commitish': 'master',
                'name': 'version %s' % self.version,
                'body': 'Release version %s' % self.version,
                'draft': False,
                'prerelease': False
            }))
        if r.status_code != 201:
            self.fail(r, 'Failed to create release for version: %s' %
                      self.version)
        return r.json()


# }}}


def get_github_data():
    with open(os.environ['PENV'] + '/github') as f:
        un, pw = f.read().strip().split(':')
    return {'username': un, 'password': pw}


def run_upload(args):
    files = {
        os.path.join(build_path, 'build', f.format(version)): desc
        for f, desc in {
            'osx/dist/kitty-{}.dmg': 'macOS dmg',
        }.items()
    }
    for f in files:
        if not os.path.exists(f):
            raise SystemExit('The installer {} does not exist'.format(f))
    gd = get_github_data()
    gh = GitHub(files, appname, version, gd['username'], gd['password'])
    gh()


def require_git_master(branch='master'):
    b = subprocess.check_output(['git', 'symbolic-ref', '--short', 'HEAD']).decode('utf-8').strip()
    if b != branch:
        raise SystemExit('You must be in the {} got branch'.format(branch))


def main():
    require_git_master()
    parser = argparse.ArgumentParser(description='Publish kitty')
    parser.add_argument(
        '--only',
        default=False,
        action='store_true',
        help='Only run the specified action')
    parser.add_argument(
        'action',
        default='build',
        nargs='?',
        choices=ALL_ACTIONS,
        help='The action to start with')
    args = parser.parse_args()
    idx = ALL_ACTIONS.index(args.action)
    actions = ALL_ACTIONS[idx:]
    if args.only:
        del actions[1:]
    else:
        try:
            ans = input('Publish version \033[91m{}\033[m (y/n): '.format(version))
        except KeyboardInterrupt:
            ans = 'n'
        if ans.lower() != 'y':
            return
    for action in actions:
        print('Running', action)
        cwd = os.getcwd()
        globals()['run_' + action](args)
        os.chdir(cwd)


if __name__ == '__main__':
    main()