import csv
import os
import shutil
from pathlib import Path

from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler
from jinja2 import Environment, FileSystemLoader, select_autoescape
import yaml
import frontmatter
import markdown2
import fire
import minify_html

from common.functions import *


def load_translations(file_path, _dict):
    with open(file_path) as f:
        reader = csv.DictReader(f, delimiter='|')  #
        for row in reader:  # проходим по строкам csv, каждая из которых является словарём
            _dict[row['id']] = row  # добавляем ключ - значение ключа id, значение - словарь row 
            del row[
                'id']  # удаляем ключ по названием "id" из словаря row, так как его значение уже является ключом в словаре _dict


# Функции, доступные в теме
def translate(id, language):
    global translations
    return translations[id][language]


translations = {}  # здесь будут переводы от темы и от сайта
config = yaml.safe_load(read_file('config.yaml'))  # Читаем конфиг сайта
running = False  # нужно для проверки


# класс для watchdog
# Во время разработки, при обнаружении изменений в папках content и themes/{config['theme']},
# перегенерировать папку public
class Develop(PatternMatchingEventHandler):
    def __init__(self):
        PatternMatchingEventHandler.__init__(self, patterns=['*.md', '*.css'],
                                             ignore_directories=True, case_sensitive=False)

    def on_modified(self, event):
        print(f'event type: {event.event_type} path : {event.src_path}')
        franca()

    def on_created(self, event):
        print(f'event type: {event.event_type} path : {event.src_path}')
        franca()

    def on_deleted(self, event):
        print(f'event type: {event.event_type} path : {event.src_path}')
        franca()


# Функция для запуска разработки
def develop(prod):
    global running
    if not prod and not running:
        event_handler = Develop()
        observer = Observer()
        observer.schedule(event_handler, path='content', recursive=True)
        observer.schedule(event_handler, path='assets', recursive=True)
        observer.schedule(event_handler, path='static', recursive=True)
        observer.schedule(event_handler, path='config.yaml')
        observer.schedule(event_handler, path=f"themes/{config['theme']}", recursive=True)
        observer.start()
        running = True
        try:
            start_httpd(directory='public')
        except KeyboardInterrupt:
            pass


# Функция для генерации сайта
def franca(prod=False):
    if not prod:
        config['base_url'] = "http://127.0.0.1:8000"
    # Load theme's jinja templates
    templates = Environment(loader=FileSystemLoader(
        f"themes/{config['theme']}/templates/"), autoescape=select_autoescape())

    # Load base jinja template
    base = templates.get_template("base.j2")
    index = templates.get_template("index.j2")

    # Load translations
    global translations
    load_translations(f"themes/{config['theme']}/i18n.csv", translations)
    load_translations("i18n.csv", translations)

    # Add functions to base template
    base.globals.update({"translate": translate})

    # Remove public folder if exists before generating new content
    shutil.rmtree('public', ignore_errors=True)

    posts = {}
    # Create new public folder
    for language in config['languages']:
        content_dir = Path(f"content/{language}")
        posts[language] = {}

        # Create posts dict
        for item in list(content_dir.rglob("*.md")):
            post_data = frontmatter.loads(read_file(item))

            post_path = str(item).replace(
                "content", "public").rstrip(".md")
            os.makedirs(post_path, exist_ok=True)

            content = markdown2.markdown(post_data.content, extras=['fenced-code-blocks'])
            description = content.partition('<!--more-->')[0]
            content = "{% import 'shortcodes.j2' as shortcodes %}" + content

            url = post_path.replace(f"public/{language}", "")
            section = "/" if len(url.split('/')) == 2 else url.split('/')[1]
            date = post_data['date']
            posts[language].setdefault(date, {})
            posts[language][date].setdefault(section, {})

            posts[language][date][section][url] = {
                'title': post_data['title'],
                'description': description,
                'date': date,
                'content': templates.from_string(content).render()
            }

            image = post_data.get('image', None)
            if image:
                os.makedirs(os.path.dirname(f'public{image}'), exist_ok=True)
                filename = image.split('/')[-1].split('.')[0]

                create_thumbnail(f'assets{image}', f'public/images/{filename}_600.jpg', 600)
                posts[language][date][section][url]['image'] = f'/images/{filename}_600.jpg'

                create_thumbnail(f'assets{image}', f'public/images/{filename}_400.jpg', 400)
                posts[language][date][section][url]['thumbnail'] = f'/images/{filename}_400.jpg'

        posts[language] = dict(sorted(posts[language].items(), reverse=True))

        for date, sections in posts[language].items():
            for section, urls in sections.items():
                if section != "/":
                    html = base.render(config=config, section=section,
                                       language=language, posts=posts)

                    write_file(f"public/{language}/{section}/index.html", minify_html.minify(html, minify_js=True))

                for url, post in urls.items():
                    html = base.render(config=config, post=post,
                                       language=language, url=url, posts=posts)

                    write_file(f"public/{language}{url}/index.html", minify_html.minify(html, minify_js=True))

        html = base.render(config=config, posts=posts,
                           language=language, home=True)

        write_file(f"public/{language}/index.html", minify_html.minify(html, minify_js=True))

        # copy images/css/js from theme
        shutil.copytree(f"themes/{config['theme']}/static/images", 'public/images', dirs_exist_ok=True)
        css = read_file(f"themes/{config['theme']}/static/css/style.css")
        minify_css('public/css/style.css', css)
        if 'css_includes' in config:
            for include in config['css_includes']:
                css = read_file(f"themes/{config['theme']}/static/css/{include}")
                minify_css(f'public/css/{include}', css)
        if 'js_includes' in config:
            for include in config['js_includes']:
                copy_file(f"themes/{config['theme']}/static/js/{include}", 'public/js/')

                # copy css/images from site static folder
        if 'custom_css' in config:
            shutil.copytree('static/css', 'public/css', dirs_exist_ok=True)

        copy_file('static/logo.svg', 'public/')
        copy_file('static/favicon.ico', 'public/')

        # Write main index.html
        html = index.render(config=config)
        write_file('public/index.html', minify_html.minify(html, minify_js=True))
        # Write robots.txt
        robots_content = "User-agent: *"
        if not config.get('search_engines', None) == "allow":
            robots_content += "\nDisallow: /"
        write_file('public/robots.txt', robots_content)

    global running
    if not running:
        if 'pagefind' in config:
            os.system("npx pagefind --source public")  # build search index

    develop(prod)


if __name__ == '__main__':
    fire.Fire(franca)