from __future__ import unicode_literals

import itertools
import hashlib
import json
import re

from .common import InfoExtractor
from ..compat import (
    compat_str,
    compat_HTTPError,
)
from ..utils import (
    ExtractorError,
    float_or_none,
    get_element_by_attribute,
    int_or_none,
    lowercase_escape,
    std_headers,
    try_get,
    url_or_none,
)


class InstagramIE(InfoExtractor):
    _VALID_URL = (
        r"(?P<url>https?://(?:www\.)?instagram\.com/(?:p|tv|reel)/(?P<id>[^/?#&]+))"
    )
    _TESTS = [
        {
            "url": "https://instagram.com/p/aye83DjauH/?foo=bar#abc",
            "md5": "0d2da106a9d2631273e192b372806516",
            "info_dict": {
                "id": "aye83DjauH",
                "ext": "mp4",
                "title": "Video by naomipq",
                "description": "md5:1f17f0ab29bd6fe2bfad705f58de3cb8",
                "thumbnail": r"re:^https?://.*\.jpg",
                "duration": 0,
                "timestamp": 1371748545,
                "upload_date": "20130620",
                "uploader_id": "naomipq",
                "uploader": "B E A U T Y  F O R  A S H E S",
                "like_count": int,
                "comment_count": int,
                "comments": list,
            },
        },
        {
            # missing description
            "url": "https://www.instagram.com/p/BA-pQFBG8HZ/?taken-by=britneyspears",
            "info_dict": {
                "id": "BA-pQFBG8HZ",
                "ext": "mp4",
                "title": "Video by britneyspears",
                "thumbnail": r"re:^https?://.*\.jpg",
                "duration": 0,
                "timestamp": 1453760977,
                "upload_date": "20160125",
                "uploader_id": "britneyspears",
                "uploader": "Britney Spears",
                "like_count": int,
                "comment_count": int,
                "comments": list,
            },
            "params": {
                "skip_download": True,
            },
        },
        {
            # multi video post
            "url": "https://www.instagram.com/p/BQ0eAlwhDrw/",
            "playlist": [
                {
                    "info_dict": {
                        "id": "BQ0dSaohpPW",
                        "ext": "mp4",
                        "title": "Video 1",
                    },
                },
                {
                    "info_dict": {
                        "id": "BQ0dTpOhuHT",
                        "ext": "mp4",
                        "title": "Video 2",
                    },
                },
                {
                    "info_dict": {
                        "id": "BQ0dT7RBFeF",
                        "ext": "mp4",
                        "title": "Video 3",
                    },
                },
            ],
            "info_dict": {
                "id": "BQ0eAlwhDrw",
                "title": "Post by instagram",
                "description": "md5:0f9203fc6a2ce4d228da5754bcf54957",
            },
        },
        {
            # IGTV
            "url": "https://www.instagram.com/tv/BkfuX9UB-eK/",
            "info_dict": {
                "id": "BkfuX9UB-eK",
                "ext": "mp4",
                "title": "Fingerboarding Tricks with @cass.fb",
                "thumbnail": r"re:^https?://.*\.jpg",
                "duration": 53.83,
                "timestamp": 1530032919,
                "upload_date": "20180626",
                "uploader_id": "instagram",
                "uploader": "Instagram",
                "like_count": int,
                "comment_count": int,
                "comments": list,
                "description": "Meet Cass Hirst (@cass.fb), a fingerboarding pro who can perform tiny ollies and kickflips while blindfolded.",
            },
        },
        {
            "url": "https://instagram.com/p/-Cmh1cukG2/",
            "only_matching": True,
        },
        {
            "url": "http://instagram.com/p/9o6LshA7zy/embed/",
            "only_matching": True,
        },
        {
            "url": "https://www.instagram.com/tv/aye83DjauH/",
            "only_matching": True,
        },
        {
            "url": "https://www.instagram.com/reel/CDUMkliABpa/",
            "only_matching": True,
        },
    ]

    @staticmethod
    def _extract_embed_url(webpage):
        mobj = re.search(
            r'<iframe[^>]+src=(["\'])(?P<url>(?:https?:)?//(?:www\.)?instagram\.com/p/[^/]+/embed.*?)\1',
            webpage,
        )
        if mobj:
            return mobj.group("url")

        blockquote_el = get_element_by_attribute("class", "instagram-media", webpage)
        if blockquote_el is None:
            return

        mobj = re.search(r'<a[^>]+href=([\'"])(?P<link>[^\'"]+)\1', blockquote_el)
        if mobj:
            return mobj.group("link")

    def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        video_id = mobj.group("id")
        url = mobj.group("url")

        webpage = self._download_webpage(url, video_id)

        (
            media,
            video_url,
            description,
            thumbnail,
            timestamp,
            uploader,
            uploader_id,
            like_count,
            comment_count,
            comments,
            height,
            width,
        ) = [None] * 12

        shared_data = self._parse_json(
            self._search_regex(
                r"window\._sharedData\s*=\s*({.+?});",
                webpage,
                "shared data",
                default="{}",
            ),
            video_id,
            fatal=False,
        )
        if shared_data:
            media = try_get(
                shared_data,
                (
                    lambda x: x["entry_data"]["PostPage"][0]["graphql"][
                        "shortcode_media"
                    ],
                    lambda x: x["entry_data"]["PostPage"][0]["media"],
                ),
                dict,
            )
        # _sharedData.entry_data.PostPage is empty when authenticated (see
        # https://github.com/ytdl-org/youtube-dl/pull/22880)
        if not media:
            additional_data = self._parse_json(
                self._search_regex(
                    r"window\.__additionalDataLoaded\s*\(\s*[^,]+,\s*({.+?})\s*\)\s*;",
                    webpage,
                    "additional data",
                    default="{}",
                ),
                video_id,
                fatal=False,
            )
            if additional_data:
                media = try_get(
                    additional_data, lambda x: x["graphql"]["shortcode_media"], dict
                )
        if media:
            video_url = media.get("video_url")
            height = int_or_none(media.get("dimensions", {}).get("height"))
            width = int_or_none(media.get("dimensions", {}).get("width"))
            description = (
                try_get(
                    media,
                    lambda x: x["edge_media_to_caption"]["edges"][0]["node"]["text"],
                    compat_str,
                )
                or media.get("caption")
            )
            title = media.get("title")
            thumbnail = media.get("display_src") or media.get("display_url")
            duration = float_or_none(media.get("video_duration"))
            timestamp = int_or_none(
                media.get("taken_at_timestamp") or media.get("date")
            )
            uploader = media.get("owner", {}).get("full_name")
            uploader_id = media.get("owner", {}).get("username")

            def get_count(keys, kind):
                if not isinstance(keys, (list, tuple)):
                    keys = [keys]
                for key in keys:
                    count = int_or_none(
                        try_get(
                            media,
                            (
                                lambda x: x["edge_media_%s" % key]["count"],
                                lambda x: x["%ss" % kind]["count"],
                            ),
                        )
                    )
                    if count is not None:
                        return count

            like_count = get_count("preview_like", "like")
            comment_count = get_count(
                ("preview_comment", "to_comment", "to_parent_comment"), "comment"
            )

            comments = [
                {
                    "author": comment.get("user", {}).get("username"),
                    "author_id": comment.get("user", {}).get("id"),
                    "id": comment.get("id"),
                    "text": comment.get("text"),
                    "timestamp": int_or_none(comment.get("created_at")),
                }
                for comment in media.get("comments", {}).get("nodes", [])
                if comment.get("text")
            ]
            if not video_url:
                edges = (
                    try_get(
                        media, lambda x: x["edge_sidecar_to_children"]["edges"], list
                    )
                    or []
                )
                if edges:
                    entries = []
                    for edge_num, edge in enumerate(edges, start=1):
                        node = try_get(edge, lambda x: x["node"], dict)
                        if not node:
                            continue
                        node_video_url = url_or_none(node.get("video_url"))
                        if not node_video_url:
                            continue
                        entries.append(
                            {
                                "id": node.get("shortcode") or node["id"],
                                "title": node.get("title") or "Video %d" % edge_num,
                                "url": node_video_url,
                                "thumbnail": node.get("display_url"),
                                "duration": float_or_none(node.get("video_duration")),
                                "width": int_or_none(
                                    try_get(node, lambda x: x["dimensions"]["width"])
                                ),
                                "height": int_or_none(
                                    try_get(node, lambda x: x["dimensions"]["height"])
                                ),
                                "view_count": int_or_none(node.get("video_view_count")),
                            }
                        )
                    return self.playlist_result(
                        entries,
                        video_id,
                        "Post by %s" % uploader_id if uploader_id else None,
                        description,
                    )

        if not video_url:
            video_url = self._og_search_video_url(webpage, secure=False)

        formats = [
            {
                "url": video_url,
                "width": width,
                "height": height,
            }
        ]

        if not uploader_id:
            uploader_id = self._search_regex(
                r'"owner"\s*:\s*{\s*"username"\s*:\s*"(.+?)"',
                webpage,
                "uploader id",
                fatal=False,
            )

        if not description:
            description = self._search_regex(
                r'"caption"\s*:\s*"(.+?)"', webpage, "description", default=None
            )
            if description is not None:
                description = lowercase_escape(description)

        if not thumbnail:
            thumbnail = self._og_search_thumbnail(webpage)

        return {
            "id": video_id,
            "formats": formats,
            "ext": "mp4",
            "title": title or "Video by %s" % uploader_id,
            "description": description,
            "duration": duration,
            "thumbnail": thumbnail,
            "timestamp": timestamp,
            "uploader_id": uploader_id,
            "uploader": uploader,
            "like_count": like_count,
            "comment_count": comment_count,
            "comments": comments,
        }


class InstagramPlaylistIE(InfoExtractor):
    # A superclass for handling any kind of query based on GraphQL which
    # results in a playlist.

    _gis_tmpl = None  # used to cache GIS request type

    def _parse_graphql(self, webpage, item_id):
        # Reads a webpage and returns its GraphQL data.
        return self._parse_json(
            self._search_regex(
                r"sharedData\s*=\s*({.+?})\s*;\s*[<\n]", webpage, "data"
            ),
            item_id,
        )

    def _extract_graphql(self, data, url):
        # Parses GraphQL queries containing videos and generates a playlist.
        def get_count(suffix):
            return int_or_none(
                try_get(node, lambda x: x["edge_media_" + suffix]["count"])
            )

        uploader_id = self._match_id(url)
        csrf_token = data["config"]["csrf_token"]
        rhx_gis = data.get("rhx_gis") or "3c7ca9dcefcf966d11dacf1f151335e8"

        cursor = ""
        for page_num in itertools.count(1):
            variables = {
                "first": 12,
                "after": cursor,
            }
            variables.update(self._query_vars_for(data))
            variables = json.dumps(variables)

            if self._gis_tmpl:
                gis_tmpls = [self._gis_tmpl]
            else:
                gis_tmpls = [
                    "%s" % rhx_gis,
                    "",
                    "%s:%s" % (rhx_gis, csrf_token),
                    "%s:%s:%s" % (rhx_gis, csrf_token, std_headers["User-Agent"]),
                ]

            # try all of the ways to generate a GIS query, and not only use the
            # first one that works, but cache it for future requests
            for gis_tmpl in gis_tmpls:
                try:
                    json_data = self._download_json(
                        "https://www.instagram.com/graphql/query/",
                        uploader_id,
                        "Downloading JSON page %d" % page_num,
                        headers={
                            "X-Requested-With": "XMLHttpRequest",
                            "X-Instagram-GIS": hashlib.md5(
                                ("%s:%s" % (gis_tmpl, variables)).encode("utf-8")
                            ).hexdigest(),
                        },
                        query={
                            "query_hash": self._QUERY_HASH,
                            "variables": variables,
                        },
                    )
                    media = self._parse_timeline_from(json_data)
                    self._gis_tmpl = gis_tmpl
                    break
                except ExtractorError as e:
                    # if it's an error caused by a bad query, and there are
                    # more GIS templates to try, ignore it and keep trying
                    if isinstance(e.cause, compat_HTTPError) and e.cause.code == 403:
                        if gis_tmpl != gis_tmpls[-1]:
                            continue
                    raise

            edges = media.get("edges")
            if not edges or not isinstance(edges, list):
                break

            for edge in edges:
                node = edge.get("node")
                if not node or not isinstance(node, dict):
                    continue
                if (
                    node.get("__typename") != "GraphVideo"
                    and node.get("is_video") is not True
                ):
                    continue
                video_id = node.get("shortcode")
                if not video_id:
                    continue

                info = self.url_result(
                    "https://instagram.com/p/%s/" % video_id,
                    ie=InstagramIE.ie_key(),
                    video_id=video_id,
                )

                description = try_get(
                    node,
                    lambda x: x["edge_media_to_caption"]["edges"][0]["node"]["text"],
                    compat_str,
                )
                thumbnail = node.get("thumbnail_src") or node.get("display_src")
                timestamp = int_or_none(node.get("taken_at_timestamp"))

                comment_count = get_count("to_comment")
                like_count = get_count("preview_like")
                view_count = int_or_none(node.get("video_view_count"))

                info.update(
                    {
                        "description": description,
                        "thumbnail": thumbnail,
                        "timestamp": timestamp,
                        "comment_count": comment_count,
                        "like_count": like_count,
                        "view_count": view_count,
                    }
                )

                yield info

            page_info = media.get("page_info")
            if not page_info or not isinstance(page_info, dict):
                break

            has_next_page = page_info.get("has_next_page")
            if not has_next_page:
                break

            cursor = page_info.get("end_cursor")
            if not cursor or not isinstance(cursor, compat_str):
                break

    def _real_extract(self, url):
        user_or_tag = self._match_id(url)
        webpage = self._download_webpage(url, user_or_tag)
        data = self._parse_graphql(webpage, user_or_tag)

        self._set_cookie("instagram.com", "ig_pr", "1")

        return self.playlist_result(
            self._extract_graphql(data, url), user_or_tag, user_or_tag
        )


class InstagramUserIE(InstagramPlaylistIE):
    _VALID_URL = r"https?://(?:www\.)?instagram\.com/(?P<id>[^/]{2,})/?(?:$|[?#])"
    IE_DESC = "Instagram user profile"
    IE_NAME = "instagram:user"
    _TEST = {
        "url": "https://instagram.com/porsche",
        "info_dict": {
            "id": "porsche",
            "title": "porsche",
        },
        "playlist_count": 5,
        "params": {
            "extract_flat": True,
            "skip_download": True,
            "playlistend": 5,
        },
    }

    _QUERY_HASH = ("42323d64886122307be10013ad2dcc44",)

    @staticmethod
    def _parse_timeline_from(data):
        # extracts the media timeline data from a GraphQL result
        return data["data"]["user"]["edge_owner_to_timeline_media"]

    @staticmethod
    def _query_vars_for(data):
        # returns a dictionary of variables to add to the timeline query based
        # on the GraphQL of the original page
        return {"id": data["entry_data"]["ProfilePage"][0]["graphql"]["user"]["id"]}


class InstagramTagIE(InstagramPlaylistIE):
    _VALID_URL = r"https?://(?:www\.)?instagram\.com/explore/tags/(?P<id>[^/]+)"
    IE_DESC = "Instagram hashtag search"
    IE_NAME = "instagram:tag"
    _TEST = {
        "url": "https://instagram.com/explore/tags/lolcats",
        "info_dict": {
            "id": "lolcats",
            "title": "lolcats",
        },
        "playlist_count": 50,
        "params": {
            "extract_flat": True,
            "skip_download": True,
            "playlistend": 50,
        },
    }

    _QUERY_HASH = ("f92f56d47dc7a55b606908374b43a314",)

    @staticmethod
    def _parse_timeline_from(data):
        # extracts the media timeline data from a GraphQL result
        return data["data"]["hashtag"]["edge_hashtag_to_media"]

    @staticmethod
    def _query_vars_for(data):
        # returns a dictionary of variables to add to the timeline query based
        # on the GraphQL of the original page
        return {
            "tag_name": data["entry_data"]["TagPage"][0]["graphql"]["hashtag"]["name"]
        }
