from pathlib import Path
import argparse
import csv

from jinja2 import Environment, FileSystemLoader
from weasyprint import HTML


def load_csv(csv_path):
    categories = {}

    with open(csv_path, newline="", encoding="utf-8-sig") as f:
        sample = f.read(4096)
        f.seek(0)

        dialect = csv.Sniffer().sniff(sample, delimiters=",;")
        reader = csv.DictReader(f, dialect=dialect)

        for row in reader:
            normalized = {
                (key or "").strip().lower().replace(" ", "_"): (value or "").strip()
                for key, value in row.items()
            }

            category = (
                normalized.get("category")
                or normalized.get("catagory")
                or normalized.get("kategorie")
                or "Ostatní"
            )

            name = (
                normalized.get("name")
                or normalized.get("nazev")
                or normalized.get("název")
                or ""
            )

            price = (
                normalized.get("price")
                or normalized.get("cena")
                or ""
            )

            image = (
                normalized.get("image")
                or normalized.get("foto")
                or normalized.get("fotka")
                or normalized.get("obrazek")
                or normalized.get("obrázek")
                or ""
            )

            show_allergen_icon = (
                normalized.get("show_alergen_icon")
                or normalized.get("show_allergen_icon")
                or normalized.get("alergen_icon")
                or normalized.get("allergen_icon")
                or ""
            ).lower() in ("1", "true", "yes", "ano", "y")

            note = (
                normalized.get("note")
                or normalized.get("description")
                or normalized.get("poznamka")
                or normalized.get("poznámka")
                or ""
            )

            if category not in categories:
                categories[category] = []

            categories[category].append({
                "name": name,
                "price": price,
                "image": image,
                "show_allergen_icon": show_allergen_icon,
                "description": note,
            })

    return categories


def build_catalog_data(title, subtitle, categories):
    return {
        "title": title,
        "subtitle": subtitle,
        "categories": [
            {
                "name": name,
                "products": products,
            }
            for name, products in categories.items()
        ],
    }


def render_html(data, template_dir, images_dir):
    env = Environment(
        loader=FileSystemLoader(template_dir)
    )

    template = env.get_template("catalog.html.j2")
    return template.render(
    catalog=data,
    brand=data,
    settings={
        "columns": 4,
        "page_size": "1024px 768px",
        "margin": "0",
    },
    images_dir=images_dir.as_posix(),
    assets_dir=(Path(__file__).resolve().parent / "assets").as_posix(),
    logo_exists=(Path(__file__).resolve().parent / "assets" / "logo.png").exists(),
)


def generate_pdf(html_content, output_path):
    HTML(string=html_content).write_pdf(output_path)


def main():
    parser = argparse.ArgumentParser()

    parser.add_argument(
        "-i",
        "--input",
        required=True,
        help="CSV input file"
    )

    parser.add_argument(
        "--output",
        default="output/catalog.pdf",
        help="Output PDF path"
    )

    parser.add_argument(
        "--images-dir",
        default="images",
        help="Directory with product images"
    )

    parser.add_argument(
        "--title",
        default="Bistro Ušky",
    )

    parser.add_argument(
        "--subtitle",
        default="Cake & Patisserie",
    )

    args = parser.parse_args()

    base_dir = Path(__file__).resolve().parent

    csv_path = Path(args.input)
    output_path = Path(args.output)
    images_dir = Path(args.images_dir)

    output_path.parent.mkdir(parents=True, exist_ok=True)

    categories = load_csv(csv_path)

    catalog_data = build_catalog_data(
        args.title,
        args.subtitle,
        categories,
    )

    html = render_html(
        catalog_data,
        base_dir / "templates",
        images_dir,
    )

    generate_pdf(html, output_path)

    print(f"PDF generated: {output_path}")


if __name__ == "__main__":
    main()