import concurrent.futures
import hashlib
import json
import logging
import os
import shutil
import subprocess
import sys

import bs4
import closure
import cssmin
import htmlmin
import jsmin

import util


def handle_iframe(iframe, soup):
    allowed_domains = ['https://www.youtube.com/', 'https://datalens.yandex/']
    illegal_domain = True
    iframe_src = iframe.attrs['src']
    for domain in allowed_domains:
        if iframe_src.startswith(domain):
            illegal_domain = False
            break
    if illegal_domain:
        raise RuntimeError(f'iframe from illegal domain: {iframe_src}')
    wrapper = soup.new_tag('div')
    wrapper.attrs['class'] = ['embed-responsive', 'embed-responsive-16by9']
    iframe.insert_before(wrapper)
    iframe.extract()
    wrapper.insert(0, iframe)
    if 'width' in iframe.attrs:
        del iframe.attrs['width']
    if 'height' in iframe.attrs:
        del iframe.attrs['height']
    iframe.attrs['allow'] = 'accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture'
    iframe.attrs['class'] = 'embed-responsive-item'
    iframe.attrs['frameborder'] = '0'
    iframe.attrs['allowfullscreen'] = '1'


def adjust_markdown_html(content):
    soup = bs4.BeautifulSoup(
        content,
        features='html.parser'
    )

    for a in soup.find_all('a'):
        a_class = a.attrs.get('class')
        a_href = a.attrs.get('href')
        if a_class and 'headerlink' in a_class:
            a.string = '\xa0'
        if a_href and a_href.startswith('http'):
            a.attrs['target'] = '_blank'

    for code in soup.find_all('code'):
        code_class = code.attrs.get('class')
        if code_class:
            code.attrs['class'] = code_class + ['syntax']
        else:
            code.attrs['class'] = 'syntax'

    for iframe in soup.find_all('iframe'):
        handle_iframe(iframe, soup)

    for img in soup.find_all('img'):
        if img.attrs.get('alt') == 'iframe':
            img.name = 'iframe'
            img.string = ''
            handle_iframe(img, soup)
            continue
        img_class = img.attrs.get('class')
        if img_class:
            img.attrs['class'] = img_class + ['img-fluid']
        else:
            img.attrs['class'] = 'img-fluid'

    for details in soup.find_all('details'):
        for summary in details.find_all('summary'):
            if summary.parent != details:
                summary.extract()
                details.insert(0, summary)

    for dd in soup.find_all('dd'):
        dd_class = dd.attrs.get('class')
        if dd_class:
            dd.attrs['class'] = dd_class + ['pl-3']
        else:
            dd.attrs['class'] = 'pl-3'

    for div in soup.find_all('div'):
        div_class = div.attrs.get('class')
        is_admonition = div_class and 'admonition' in div.attrs.get('class')
        if is_admonition:
            for a in div.find_all('a'):
                a_class = a.attrs.get('class')
                if a_class:
                    a.attrs['class'] = a_class + ['alert-link']
                else:
                    a.attrs['class'] = 'alert-link'

        for p in div.find_all('p'):
            p_class = p.attrs.get('class')
            if is_admonition and p_class and ('admonition-title' in p_class):
                p.attrs['class'] = p_class + ['alert-heading', 'display-4', 'text-reset', 'mb-2']

        if is_admonition:
            div.attrs['role'] = 'alert'
            if ('info' in div_class) or ('note' in div_class):
                mode = 'alert-primary'
            elif ('attention' in div_class) or ('warning' in div_class):
                mode = 'alert-warning'
            elif 'important' in div_class:
                mode = 'alert-danger'
            elif 'tip' in div_class:
                mode = 'alert-info'
            else:
                mode = 'alert-secondary'
            div.attrs['class'] = div_class + ['alert', 'pb-0', 'mb-4', mode]

    return str(soup)


def minify_html(content):
    return htmlmin.minify(content)


def build_website(args):
    logging.info('Building website')
    env = util.init_jinja2_env(args)

    shutil.copytree(
        args.website_dir,
        args.output_dir,
        ignore=shutil.ignore_patterns(
            '*.md',
            '*.sh',
            '*.css',
            '*.json',
            'js/*.js',
            'build',
            'docs',
            'public',
            'node_modules',
            'src',
            'templates',
            'locale',
            '.gitkeep'
        )
    )

    shutil.copytree(
        os.path.join(args.website_dir, 'images'),
        os.path.join(args.output_dir, 'docs', 'images')
    )

    # This file can be requested to check for available ClickHouse releases.
    shutil.copy2(
        os.path.join(args.src_dir, 'utils', 'list-versions', 'version_date.tsv'),
        os.path.join(args.output_dir, 'data', 'version_date.tsv'))

    # This file can be requested to install ClickHouse.
    shutil.copy2(
        os.path.join(args.src_dir, 'docs', '_includes', 'install', 'universal.sh'),
        os.path.join(args.output_dir, 'data', 'install.sh'))

    for root, _, filenames in os.walk(args.output_dir):
        for filename in filenames:
            if filename == 'main.html':
                continue

            path = os.path.join(root, filename)
            if not filename.endswith('.html'):
                continue
            logging.info('Processing %s', path)
            with open(path, 'rb') as f:
                content = f.read().decode('utf-8')

            template = env.from_string(content)
            content = template.render(args.__dict__)

            with open(path, 'wb') as f:
                f.write(content.encode('utf-8'))


def get_css_in(args):
    return [
        f"'{args.website_dir}/css/bootstrap.css'",
        f"'{args.website_dir}/css/docsearch.css'",
        f"'{args.website_dir}/css/base.css'",
        f"'{args.website_dir}/css/blog.css'",
        f"'{args.website_dir}/css/docs.css'",
        f"'{args.website_dir}/css/highlight.css'",
        f"'{args.website_dir}/css/main.css'"
    ]


def get_js_in(args):
    return [
        f"'{args.website_dir}/js/jquery.js'",
        f"'{args.website_dir}/js/popper.js'",
        f"'{args.website_dir}/js/bootstrap.js'",
        f"'{args.website_dir}/js/sentry.js'",
        f"'{args.website_dir}/js/base.js'",
        f"'{args.website_dir}/js/index.js'",
        f"'{args.website_dir}/js/docsearch.js'",
        f"'{args.website_dir}/js/docs.js'",
        f"'{args.website_dir}/js/main.js'"
    ]


def minify_file(path, css_digest, js_digest):
    if not (
        path.endswith('.html') or
        path.endswith('.css')
    ):
        return

    logging.info('Minifying %s', path)
    with open(path, 'rb') as f:
        content = f.read().decode('utf-8')
    if path.endswith('.html'):
        content = minify_html(content)
        content = content.replace('base.css?css_digest', f'base.css?{css_digest}')
        content = content.replace('base.js?js_digest', f'base.js?{js_digest}')
# TODO: restore cssmin
#     elif path.endswith('.css'):
#         content = cssmin.cssmin(content)
# TODO: restore jsmin
#     elif path.endswith('.js'):
#         content = jsmin.jsmin(content)
    with open(path, 'wb') as f:
        f.write(content.encode('utf-8'))


def minify_website(args):
    css_in = ' '.join(get_css_in(args))
    css_out = f'{args.output_dir}/docs/css/base.css'
    os.makedirs(f'{args.output_dir}/docs/css')

    if args.minify and False:  # TODO: return closure
        command = f"purifycss -w '*algolia*' --min {css_in} '{args.output_dir}/*.html' " \
            f"'{args.output_dir}/docs/en/**/*.html' '{args.website_dir}/js/**/*.js' > {css_out}"
        logging.info(css_in)
        logging.info(command)
        output = subprocess.check_output(command, shell=True)
        logging.debug(output)

    else:
        command = f"cat {css_in}"
        output = subprocess.check_output(command, shell=True)
        with open(css_out, 'wb+') as f:
            f.write(output)

    with open(css_out, 'rb') as f:
        css_digest = hashlib.sha3_224(f.read()).hexdigest()[0:8]

    js_in = ' '.join(get_js_in(args))
    js_out = f'{args.output_dir}/docs/js/base.js'
    os.makedirs(f'{args.output_dir}/docs/js')

    if args.minify and False:  # TODO: return closure
        js_in = [js[1:-1] for js in js_in]
        closure_args = [
            '--js', *js_in, '--js_output_file', js_out,
            '--compilation_level', 'SIMPLE',
            '--dependency_mode', 'NONE',
            '--third_party', '--use_types_for_optimization',
            '--isolation_mode', 'IIFE'
        ]
        logging.info(closure_args)
        if closure.run(*closure_args):
            raise RuntimeError('failed to run closure compiler')
        with open(js_out, 'r') as f:
            js_content = jsmin.jsmin(f.read())
        with open(js_out, 'w') as f:
            f.write(js_content)

    else:
        command = f"cat {js_in}"
        output = subprocess.check_output(command, shell=True)
        with open(js_out, 'wb+') as f:
            f.write(output)

    with open(js_out, 'rb') as f:
        js_digest = hashlib.sha3_224(f.read()).hexdigest()[0:8]
        logging.info(js_digest)

    if args.minify:
        logging.info('Minifying website')
        with concurrent.futures.ThreadPoolExecutor() as executor:
            futures = []
            for root, _, filenames in os.walk(args.output_dir):
                for filename in filenames:
                    path = os.path.join(root, filename)
                    futures.append(executor.submit(minify_file, path, css_digest, js_digest))
            for future in futures:
                exc = future.exception()
                if exc:
                    logging.error(exc)
                    sys.exit(1)


def process_benchmark_results(args):
    benchmark_root = os.path.join(args.website_dir, 'benchmark')
    required_keys = {
        'dbms': ['result'],
        'hardware': ['result', 'system', 'system_full', 'kind']
    }
    for benchmark_kind in ['dbms', 'hardware']:
        results = []
        results_root = os.path.join(benchmark_root, benchmark_kind, 'results')
        for result in sorted(os.listdir(results_root)):
            result_file = os.path.join(results_root, result)
            logging.debug(f'Reading benchmark result from {result_file}')
            with open(result_file, 'r') as f:
                result = json.loads(f.read())
                for item in result:
                    for required_key in required_keys[benchmark_kind]:
                        assert required_key in item, f'No "{required_key}" in {result_file}'
                results += result
        results_js = os.path.join(args.output_dir, 'benchmark', benchmark_kind, 'results.js')
        with open(results_js, 'w') as f:
            data = json.dumps(results)
            f.write(f'var results = {data};')