from django.utils.html import format_html

from wagtail.embeds.exceptions import EmbedException, EmbedNotFoundException

from .base import EmbedFinder


class EmbedlyException(EmbedException):
    pass


class AccessDeniedEmbedlyException(EmbedlyException):
    pass


class EmbedlyFinder(EmbedFinder):
    key = None

    def __init__(self, key=None):
        if key:
            self.key = key

    def get_key(self):
        return self.key

    def accept(self, url):
        # We don't really know what embedly supports so accept everything
        return True

    def find_embed(self, url, max_width=None, key=None):
        from embedly import Embedly

        # Get embedly key
        if key is None:
            key = self.get_key()

        # Get embedly client
        client = Embedly(key=key)

        # Call embedly
        if max_width is not None:
            oembed = client.oembed(url, maxwidth=max_width, better=False)
        else:
            oembed = client.oembed(url, better=False)

        # Check for error
        if oembed.get("error"):
            if oembed["error_code"] in [401, 403]:
                raise AccessDeniedEmbedlyException
            elif oembed["error_code"] == 404:
                raise EmbedNotFoundException
            else:
                raise EmbedlyException

        # Convert photos into HTML
        if oembed["type"] == "photo":
            html = format_html('<img src="{}" alt="">', oembed["url"])
        else:
            html = oembed.get("html")

        # Return embed as a dict
        return {
            "title": oembed["title"] if "title" in oembed else "",
            "author_name": oembed["author_name"] if "author_name" in oembed else "",
            "provider_name": oembed["provider_name"]
            if "provider_name" in oembed
            else "",
            "type": oembed["type"],
            "thumbnail_url": oembed.get("thumbnail_url"),
            "width": oembed.get("width"),
            "height": oembed.get("height"),
            "html": html,
        }


embed_finder_class = EmbedlyFinder