import datetime
import json
import re
import shutil
import hashlib

with open('web/templates/review.html', 'r') as f:
    REVIEW_TEMPLATE = f.read()


def review_id(review):
    return "_".join(re.sub('\s+', '-', x.lower() if x else '') for x in (review['company'], review['name'], review['variant']))

def review_title(review):
    return '{} "{}" {}'.format(
        review['company'], review['name'], 
        '({})'.format(review['variant']) if review['variant'] else ''
    )

def get_json():
    with open("reviews.json", 'r') as f:
        return json.load(f)

def generate_website(template_dir: str, dest: str):
    with open(template_dir + 'index.html', 'r') as f:
        website_content = f.read()
    with open(template_dir + 'table.html', 'r') as f:
        table_template = f.read()

    data = get_json()
    
    website = populate_template_str(website_content, {
        'index': generate_index(data['reviews']),
        'pesto_ratings': '\n\n'.join(generate_review_html(review) for review in data['reviews']),
        'current_year': str(datetime.date.today().year),
        'css_hash': stylesheet_hash(),
    })

    with open(dest + 'index.html', 'w') as f:
        f.write(website)
        f.write('<!-- auto generated on the {} -->'.format(datetime.datetime.now()))

def generate_review_html(review: dict) -> str:
    return populate_template_str(REVIEW_TEMPLATE, {
        'review_id': review_id(review)
        , 'title': review_title(review)
        , 'date': review['date']
        , 'notes': review['notes']
        , 'ingredients': ', '.join(review['ingredients'])
        , 'rating_taste': review['rating_value']['taste']
        , 'rating_consistency': review['rating_value']['consistency']
        , 'rating_ingredients': review['rating_value']['ingredients']
        , 'rating_price': review['rating_value']['price']
        , 'rating_size': review['rating_value']['size']
        , 'rating_servings': review['rating_value']['servings']
        , 'rating': review['final_verdict']['string']
        , 'image_items': generate_image_items(review)
        , 'categories': " ".join('<span class="category" x-category="{0}">{0}</span>'.format(cat[0].upper() + cat[1:]) for cat in review['category'])
    })

def generate_index(reviews):
    return "<ul>{}</ul>".format(
        "\n".join('<li><a href="#{}">{}</a></li>'.format(
            review_id(review), review_title(review)
        ) for review in reviews)
    )

def populate_template_str(templatestr, fields: dict[str, str]):
    def fill(match):
        return fields.get(match.group(1).lower(), 'Unknown field {}'.format(match.group(1)))

    return re.sub(r'{([A-Z_]+)}', fill, templatestr)

def generate_image_items(review: dict) -> str:
    return '\n'.join(
        '<div class="image-item"><img src="img/{}" /></div>'.format(img) 
        for img in review.get('images', [])
    )

def stylesheet_hash():
    hash = hashlib.sha256()
    with open("web/style.css", 'rb') as f:
        while True:
            chunk = f.read(hash.block_size)
            if not chunk:
                break
            hash.update(chunk)
    return hash.hexdigest()


if __name__ == '__main__':
    generate_website('web/templates/', 'web/')
    shutil.copy('reviews.json', 'web/reviews.json')