import urllib
from enum import Enum
from urllib.parse import urlencode

from lxml import etree


class TorrentSite(Enum):
    """
    Contains torrent sites
    """

    NYAASI = "https://nyaa.si"
    SUKEBEINYAASI = "https://sukebei.nyaa.si"

    # * nyaa.pantsu.cat redirects to nyaa.net
    NYAANET = "https://nyaa.net"
    SUKEBEINYAANET = "https://sukebei.nyaa.net"


def nyaa_categories(b):
    c = b.replace("?c=", "")
    cats = c.split("_")

    cat = cats[0]
    sub_cat = cats[1]

    categories = {
        "1": {
            "name": "Anime",
            "sub_cats": {
                "1": "Anime Music Video",
                "2": "English-translated",
                "3": "Non-English-translated",
                "4": "Raw",
            },
        },
        "2": {"name": "Audio", "sub_cats": {"1": "Lossless", "2": "Lossy"}},
        "3": {
            "name": "Literature",
            "sub_cats": {
                "1": "English-translated",
                "2": "Non-English-translated",
                "3": "Raw",
            },
        },
        "4": {
            "name": "Live Action",
            "sub_cats": {
                "1": "English-translated",
                "2": "Idol/Promotional Video",
                "3": "Non-English-translated",
                "4": "Raw",
            },
        },
        "5": {"name": "Pictures", "sub_cats": {"1": "Graphics", "2": "Photos"}},
        "6": {"name": "Software", "sub_cats": {"1": "Applications", "2": "Games"}},
    }

    try:
        category_name = (
            f"{categories[cat]['name']} - {categories[cat]['sub_cats'][sub_cat]}"
        )
    except KeyError:
        print("Unable to get Nyaa category name")
        return

    return category_name


def parse_nyaa_rss(request_text, limit, site):
    """
    Extracts torrent information from a given rss response.
    """
    root = etree.fromstring(request_text)
    torrents = []

    for item in root.xpath("channel/item")[:limit]:
        # Decide category.
        if site in [TorrentSite.NYAASI, TorrentSite.NYAANET]:
            category = item.findtext("nyaa:categoryId", namespaces=item.nsmap)
        elif site in [TorrentSite.SUKEBEINYAASI, TorrentSite.SUKEBEINYAANET]:
            category = item.findtext("nyaa:categoryId", namespaces=item.nsmap)
        else:
            raise ValueError("Unknown TorrentSite received!")

        try:
            is_remake = item.findtext("nyaa:remake", namespaces=item.nsmap) == "Yes"
            is_trusted = item.findtext("nyaa:trusted", namespaces=item.nsmap) == "Yes"
            item_type = (
                "remake" if is_remake else "trusted" if is_trusted else "default"
            )

            torrent = {
                "id": item.findtext("guid").split("/")[-1],
                "category": category,
                "url": item.findtext("guid"),
                "name": item.findtext("title"),
                "download_url": item.findtext("link"),
                "magnet": magnet_builder(
                    item.findtext("nyaa:infoHash", namespaces=item.nsmap),
                    item.findtext("title"),
                ),
                "size": item.findtext("nyaa:size", namespaces=item.nsmap),
                "date": item.findtext("pubDate"),
                "seeders": item.findtext("nyaa:seeders", namespaces=item.nsmap),
                "leechers": item.findtext("nyaa:leechers", namespaces=item.nsmap),
                "completed_downloads": None,
                "type": item_type,
            }
            torrents.append(torrent)
        except IndexError:
            pass

    return torrents


def parse_nyaa(request_text, limit, site):
    parser = etree.HTMLParser()
    tree = etree.fromstring(request_text, parser)

    # Put proper domain here.
    uri = site.value

    torrents = []

    # Going through table rows
    for tr in tree.xpath("//tbody//tr")[:limit]:
        block = []

        for td in tr.xpath("./td"):
            for link in td.xpath("./a"):

                href = link.attrib.get("href").split("/")[-1]

                # Only caring about non-comment pages.
                if href[-9:] != "#comments":
                    block.append(href)

                    if link.text and link.text.strip():
                        block.append(link.text.strip())

            if td.text is not None and td.text.strip():
                block.append(td.text.strip())

        # Add type of torrent based on tr class.
        if tr.attrib.get("class") is not None:
            if "danger" in tr.attrib.get("class"):
                block.append("remake")
            elif "success" in tr.attrib.get("class"):
                block.append("trusted")
            else:
                block.append("default")
        else:
            block.append("default")

        # Decide category.
        if site in [TorrentSite.NYAASI, TorrentSite.NYAANET]:
            category = nyaa_categories(block[0])
        elif site in [TorrentSite.SUKEBEINYAASI, TorrentSite.SUKEBEINYAANET]:
            category = sukebei_categories(block[0])
        else:
            raise ValueError("Unknown TorrentSite received!")

        # Create torrent object
        try:
            torrent = {
                "id": block[1],
                "category": category,
                "url": "{}/view/{}".format(uri, block[1]),
                "name": block[2],
                "download_url": "{}/download/{}".format(uri, block[3]),
                "magnet": block[4],
                "size": block[5],
                "date": block[6],
                "seeders": block[7],
                "leechers": block[8],
                "completed_downloads": block[9],
                "type": block[10],
            }
            torrents.append(torrent)
        except IndexError:
            pass
    return torrents


def parse_single(request_text, site):
    parser = etree.HTMLParser()
    tree = etree.fromstring(request_text, parser)

    # Put proper domain here.
    uri = site.value

    torrent = {}
    data = []
    torrent_files = []

    # Find basic uploader info & torrent stats
    for row in tree.xpath("//div[@class='row']"):
        for div_text in row.xpath("./div[@class='col-md-5']//text()"):
            d = div_text.strip()
            if d:
                data.append(d)

    # Find files, we need only text of the li element(s).
    # Sorry about Pycodestyle aka PEP8 (E501) error
    for el in tree.xpath("//div[contains(@class, 'torrent-file-list')]//li/text()"):
        if el.rstrip():
            torrent_files.append(el)

    torrent["title"] = tree.xpath("//h3[@class='panel-title']/text()")[0].strip()
    torrent["category"] = data[0]
    torrent["uploader"] = data[4]
    torrent["uploader_profile"] = "{}/user/{}".format(uri, data[4])
    torrent["website"] = data[6]
    torrent["size"] = data[8]
    torrent["date"] = data[3]
    torrent["seeders"] = data[5]
    torrent["leechers"] = data[7]
    torrent["completed"] = data[9]
    torrent["hash"] = data[10]
    torrent["files"] = torrent_files

    torrent["description"] = ""
    for s in tree.xpath("//div[@id='torrent-description']"):
        torrent["description"] += s.text

    return torrent


def sukebei_categories(b):
    c = b.replace("?c=", "")
    cats = c.split("_")

    cat = cats[0]
    subcat = cats[1]

    categories = {
        "1": {
            "name": "Art",
            "subcats": {
                "1": "Anime",
                "2": "Doujinshi",
                "3": "Games",
                "4": "Manga",
                "5": "Pictures",
            },
        },
        "2": {
            "name": "Real Life",
            "subcats": {"1": "Photobooks & Pictures", "2": "Videos"},
        },
    }

    try:
        category_name = (
            f"{categories[cat]['name']} - {categories[cat]['subcats'][subcat]}"
        )
    except KeyError:
        print("Unable to get Sukebei category name")
        return

    return category_name


def magnet_builder(info_hash, title):
    """
    Generates a magnet link using the info_hash and title of a given file.
    """
    known_trackers = [
        "http://nyaa.tracker.wf:7777/announce",
        "udp://open.stealth.si:80/announce",
        "udp://tracker.opentrackr.org:1337/announce",
        "udp://exodus.desync.com:6969/announce",
        "udp://tracker.torrent.eu.org:451/announce",
    ]

    magnet_link = f"magnet:?xt=urn:btih:{info_hash}&" + urlencode(
        {"dn": title}, quote_via=urllib.parse.quote
    )
    for tracker in known_trackers:
        magnet_link += f"&{urlencode({'tr': tracker})}"

    return magnet_link


# Pantsu Utils
def query_builder(q, params):
    available_params = [
        "category",
        "page",
        "limit",
        "userID",
        "fromID",
        "status",
        "maxage",
        "toDate",
        "fromDate",
        "dateType",
        "minSize",
        "maxSize",
        "sizeType",
        "sort",
        "order",
        "lang",
    ]
    query = "?q={}".format(q.replace(" ", "+"))

    for param, value in params.items():
        if param in available_params:
            if param != "category" and param != "status" and param != "lang":
                query += "&{}={}".format(param, value)
            elif param == "category":
                query += "&c={}_{}".format(value[0], value[1])

            elif param == "status":
                query += "&s={}".format(value)

            elif param == "lang":
                for lang in value:
                    query += "&lang={}".format(lang)

    return query