# -*- coding: utf-8 -*-
import argparse
import os
import re
from typing import List

import requests
from bs4 import BeautifulSoup
from tqdm import tqdm


def download_img(url, img_path) -> None:
    try:
        # Format path as pwd/pokedex_entry_number.png
        filename = os.path.join(img_path, url.split("/")[-1])
    except Exception as e:
        raise SystemExit(e)

    try:
        response = requests.get(url, stream=True)
        file_size = int(response.headers.get("Content-Length", 0))
        progress = tqdm(
            response.iter_content(1024),
            f"Downloading {filename}",
            total=file_size,
            unit="B",
            unit_scale=True,
            unit_divisor=1024,
        )
    except requests.exceptions.RequestException as e:
        raise SystemExit(e)

    if not os.path.exists(filename):
        with open(filename, "wb") as f:
            for data in progress.iterable:
                f.write(data)
                progress.update(len(data))
    else:
        print(f"File {filename} already exists!")


def write_csv_entries(pokemons_list, csv_file) -> None:
    if not os.path.exists(csv_file):
        if ".csv" not in csv_file:
            csv_file = csv_file + ".csv"
        with open(csv_file, "w", encoding="utf-8") as f:
            print(f"Writing entries to {csv_file}")
            for pokemon_row in pokemons_list:
                f.write(pokemon_row + "\n")
    else:
        print(f"File {csv_file} already exists!")


def find_pokemon_image(main_url) -> List:
    try:
        res = requests.get(main_url)
        soup = BeautifulSoup(res.content, "html.parser")
        return soup.find_all("table", {"class": "pokedex"})
    except requests.exceptions.RequestException as e:
        raise SystemExit(e)


def format_csv_entries(pokemons_table, db_url, pokedex_url, img_path) -> List:
    pokedex_number = r"[0-9]{1,3}"
    pokemon_pattern = r"[0-9]{1,3}.*html"

    pokemons_list = []
    for row in pokemons_table.find_all("tr"):
        columns = row.find_all("td")[2]
        current_pokemon = columns.get_text()
        current_entry = re.search(pokedex_number, str(columns)).group()
        anki_balise = (
            '<img src="'
            + current_entry
            + '.png"><br>N°'
            + current_entry
            + " ;"
        )
        pokemons_list.append(anki_balise + current_pokemon)

        link_balise = columns.find_all("a")
        current_url = re.search(pokemon_pattern, str(link_balise)).group()
        new_url = pokedex_url + current_url
        try:
            entry_pokemon = requests.get(new_url)
        except requests.exceptions.RequestException as e:
            raise SystemExit(e)

        new_soup = BeautifulSoup(entry_pokemon.content, "html.parser")
        pokemon_img_url = new_soup.find_all("img")[0].attrs.get("src")
        if "http" not in pokemon_img_url:
            pokemon_img_url = db_url + pokemon_img_url
        download_img(pokemon_img_url, img_path)
    return pokemons_list


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-g",
        "--generation",
        type=int,
        help="<int> Generation to retrieve <1-7>",
        required=True,
    )
    parser.add_argument(
        "-p",
        "--images-path",
        help="Where to store Pokemons pictures, default to ./Pictures",
        default="Pictures",
    )
    parser.add_argument(
        "-f",
        "--filename",
        help="Name of CSV produced in output, default to output.csv",
        default="output.csv",
    )
    args = parser.parse_args()

    if not os.path.exists(args.images_path):
        os.makedirs(args.images_path)

    db_url = "https://www.pokemontrash.com/"
    pokedex_url = db_url + "pokedex/"
    main_url = pokedex_url + "liste-pokemon.php"

    pokemons_soap = find_pokemon_image(main_url)
    # Table index 0 is 7th generation
    chosen_generation_table = pokemons_soap[7 - args.generation]
    pokemons_list = format_csv_entries(
        chosen_generation_table, db_url, pokedex_url, args.images_path
    )
    write_csv_entries(pokemons_list, args.filename)


if __name__ == "__main__":
    main()