import os
import praw
import requests
from redvid import Downloader
import yt_dlp
import re
from datetime import datetime

try:
    from logindata import REDDIT_USERNAME, REDDIT_PASSWORD
    from logindata import REDDIT_CLIENT_ID, REDDIT_SECRET
except ImportError:
    REDDIT_USERNAME = os.getenv("REDDIT_USERNAME")
    REDDIT_PASSWORD = os.getenv("REDDIT_PASSWORD")
    REDDIT_CLIENT_ID = os.getenv("REDDIT_CLIENT_ID")
    REDDIT_SECRET = os.getenv("REDDIT_SECRET")

IMAGE_EXTENSIONS = ["gif", "gifv", "jpg", "jpeg", "png"]
VIDEO_EXTENSIONS = ["mp4"]
PLATFORMS = ["redgifs.com", "gfycat.com", "imgur.com", "youtube.com"]


def make_client():
    """Creates a PRAW client with the details in the secrets.py file."""

    print(REDDIT_USERNAME)

    return praw.Reddit(
        username=REDDIT_USERNAME,
        password=REDDIT_PASSWORD,
        client_id=REDDIT_CLIENT_ID,
        client_secret=REDDIT_SECRET,
        user_agent="reddit-save",
    )


def get_previous(location, html_file):
    html_files = [f for f in os.listdir(location) if f.endswith(".html")]
    pattern = html_file.replace(".html", r"\.(\d+)?\.html")
    matches = [re.match(pattern, f) for f in html_files]
    matches = [m[0] for m in matches if m]
    matches.sort(key=lambda x: int(x.split(".")[1]))
    existing_ids = []
    existing_posts_html = []
    existing_comments_html = []
    if html_file in html_files: matches.append(html_file)
    for match in matches:
        with open(os.path.join(location, match), encoding="utf-8") as f:
            current_html = f.read()
            for id in re.findall(r'id="(.+?)"', current_html):
                if id not in existing_ids:
                    existing_ids.append(id)
            posts = re.findall(
                r'(<div class="post"[\S\n\t\v ]+?<!--postend--><\/div>)',
                current_html
            )
            comments = re.findall(
                r'(<div class="comment"[\S\n\t\v ]+?<!--commentend--><\/div>)',
                current_html
            )
            for post in posts:
                if post not in existing_posts_html:
                    existing_posts_html.append(post)
            for comment in comments:
                if comment not in existing_comments_html:
                    existing_comments_html.append(comment)
    return existing_ids, existing_posts_html, existing_comments_html


def get_saved_posts(client):
    """Gets a list of posts that the user has saved."""

    return [
        saved for saved in client.user.me().saved(limit=None)
        if saved.__class__.__name__ == "Submission"
    ]


def get_upvoted_posts(client):
    """Gets a list of posts that the user has upvoted."""

    return [
        upvoted for upvoted in client.user.me().upvoted(limit=None)
        if upvoted.__class__.__name__ == "Submission"
    ]


def get_saved_comments(client):
    """Gets a list of comments that the user has saved."""

    return [
        saved for saved in client.user.me().saved(limit=None)
        if saved.__class__.__name__ != "Submission"
    ]


def get_user_posts(client, username):
    """Gets a list of posts that the user has made."""

    return [
        post for post in client.redditor(username).submissions.new(limit=None)
    ]


def get_user_comments(client, username):
    """Gets a list of comments that the user has made."""

    return [
        comment for comment in client.redditor(username).comments.new(limit=None)
    ]


def get_post_html(post):
    """Takes a post object and creates a HTML for it - but not including the
    preview HTML."""

    with open(os.path.join("html", "post-div.html"), encoding="utf-8") as f:
        html = f.read()
    dt = datetime.utcfromtimestamp(post.created_utc)
    html = html.replace("<!--title-->", post.title)
    html = html.replace("<!--subreddit-->", f"/r/{str(post.subreddit)}")
    html = html.replace("<!--user-->", f"/u/{post.author.name}" if post.author else "[deleted]")
    html = html.replace("<!--link-->", f"posts/{post.id}.html")
    html = html.replace("<!--reddit-link-->", f"https://reddit.com{post.permalink}")
    html = html.replace("<!--content-link-->", post.url)
    html = html.replace("<!--id-->", post.id)
    html = html.replace("<!--body-->", (post.selftext_html or "").replace(
        '<a href="/r/', '<a href="https://reddit.com/r/'
    ))
    html = html.replace("<!--timestamp-->", str(dt))
    html = html.replace("<!--date-->", dt.strftime("%d %B, %Y"))
    return html


def save_media(post, location):
    """Takes a post object and tries to download any image/video it might be
    associated with. If it can, it will return the filename."""
    url = post.url
    stripped_url = url.split("?")[0]
    if url.endswith(post.permalink): return None

    # What is the key information?
    extension = stripped_url.split(".")[-1].lower()
    domain = ".".join(post.url.split("/")[2].split(".")[-2:])
    readable_name = list(filter(bool, post.permalink.split("/")))[-1]

    # Handle galleries
    # When we saved a cross_post, we don't know if it is a gallery.
    if hasattr(post, "gallery_data") or ("gallery" in url and hasattr(post, "crosspost_parent_list")):

        if not hasattr(post, "gallery_data") and hasattr(post, "crosspost_parent_list"):
            for crosspost in post.crosspost_parent_list:
                if crosspost["gallery_data"] is not None:
                    # hard hack
                    post.gallery_data = crosspost["gallery_data"]
                    post.media_metadata = crosspost["media_metadata"]
                    break
            if not hasattr(post, "gallery_data"): return None

        images = [ ]
        for item in sorted(post.gallery_data['items'], key=lambda x: x['id']):
            media_id = item['media_id']
            meta = post.media_metadata[media_id]
            source = meta['s']
            if meta['e'] == 'Image':
                url = source['u']
            elif meta['e'] == 'AnimatedImage':
                url = source['gif']
            else:
                return None
            stripped_url = url.split("?")[0]
            extension = stripped_url.split(".")[-1].lower()
            filename = f"{readable_name}_{post.id}_{media_id}.{extension}"
            try:
                response = requests.get(url)
                with open(os.path.join(location, "media", filename), "wb") as f:
                    f.write(response.content)
                    images.append(filename)
            except:
                print(f"Failed to download {url}")
        return images if len(images) > 0 else None

    # If it's an imgur gallery, forget it
    if domain == "imgur.com" and "gallery" in url: return None

    # Can the media be obtained directly?
    if extension in IMAGE_EXTENSIONS + VIDEO_EXTENSIONS:
        filename = f"{readable_name}_{post.id}.{extension}"
        try:
            response = requests.get(post.url)
        except:
            return
        media_type = response.headers.get("Content-Type", "")
        if media_type.startswith("image") or media_type.startswith("video"):
            with open(os.path.join(location, "media", filename), "wb") as f:
                f.write(response.content)
                return [ filename ]

    # Is this a v.redd.it link?
    if domain == "redd.it":
        downloader = Downloader(max_q=True, log=False)
        downloader.url = url
        current = os.getcwd()
        try:
            name = downloader.download()
            extension = name.split(".")[-1]
            filename = f"{readable_name}_{post.id}.{extension}"
            os.rename(name, os.path.join(location, "media", filename))
            return [ filename ]
        except:
            os.chdir(current)
            return None

    # Is it a gfycat link that redirects? Update the URL if possible
    if domain == "gfycat.com":
        html = requests.get(post.url).content
        if len(html) < 50000:
            match = re.search(r"http([\dA-Za-z\+\:\/\.]+)\.mp4", html.decode())
            if match:
                url = match.group()
            else:
                return None

    # Is this an imgur image?
    if domain == "imgur.com" and extension != "gifv":
        for extension in IMAGE_EXTENSIONS:
            direct_url = f'https://i.{url[url.find("//") + 2:]}.{extension}'
            direct_url = direct_url.replace("i.imgur.com", "imgur.com")
            direct_url = direct_url.replace("m.imgur.com", "imgur.com")
            try:
                response = requests.get(direct_url)
            except: continue
            if response.status_code == 200:
                filename = f"{readable_name}_{post.id}.{extension}"
                with open(os.path.join(location, "media", filename), "wb") as f:
                    f.write(response.content)
                    return [ filename ]

    # Try to use youtube_dl if it's one of the possible domains
    if domain in PLATFORMS:
        options = {
            "nocheckcertificate": True, "quiet": True, "no_warnings": True,
            "ignoreerrors": True, "no-progress": True,
            "outtmpl": os.path.join(
                location, "media", f"{readable_name}_{post.id}" + ".%(ext)s"
            )
        }
        with yt_dlp.YoutubeDL(options) as ydl:
            try:
                ydl.download([url])
            except:
                os.chdir(current)
                return
        for f in os.listdir(os.path.join(location, "media")):
            if f.startswith(f"{readable_name}_{post.id}"):
                return [ f ]


def add_media_preview_to_html(post_html, media):
    """Takes post HTML and returns a modified version with the preview
    inserted."""

    media_html_list = []

    for m in media:
        extension = m.split(".")[-1]
        location = "/".join(["media", m])
        if extension in IMAGE_EXTENSIONS:
            media_html_list.append(f'<img src="{location}">')
        if extension in VIDEO_EXTENSIONS:
            media_html_list.append(f'<video controls><source src="{location}"></video>')
    return post_html.replace('<!--preview-->', ''.join([ f"<div class=\"preview\">{item}</div>" for item in media_html_list]))


def create_post_page_html(post, post_html):
    """Creates the HTML for a post's own page."""

    with open(os.path.join("html", "post.html"), encoding="utf-8") as f:
        html = f.read()
    html = html.replace("<!--title-->", post.title)
    html = html.replace("<!--post-->", post_html.replace("h2>", "h1>").replace(
        '<img src="media/', '<img src="../media/'
    ).replace(
        '<source src="media/', '<source src="../media/'
    ))
    html = re.sub(r'<a href="posts(.+?)</a>', "", html)
    with open(os.path.join("html", "style.css"), encoding="utf-8") as f:
        html = html.replace("<style></style>", f"<style>\n{f.read()}\n</style>")
    with open(os.path.join("html", "main.js"), encoding="utf-8") as f:
        html = html.replace("<script></script>", f"<script>\n{f.read()}\n</script>")
    comments_html = []
    post.comments.replace_more(limit=0)
    for comment in post.comments:
        comments_html.append(get_comment_html(
            comment, op=post.author.name if post.author else None
        ))
    html = html.replace("<!--comments-->", "\n".join(comments_html))
    return html


def get_comment_html(comment, children=True, op=None):
    """Takes a post object and creates a HTML for it - it will get its children
    too unless you specify otherwise."""

    with open(os.path.join("html", "comment-div.html"), encoding="utf-8") as f:
        html = f.read()
    dt = datetime.utcfromtimestamp(comment.created_utc)
    author = "[deleted]"
    if comment.author:
        if comment.author == op:
            author = f'<span class="op">/u/{comment.author.name}</span>'
        else:
            author = f"/u/{comment.author.name}"
    html = html.replace("<!--user-->", author)
    html = html.replace("<!--body-->", (comment.body_html or "").replace(
        '<a href="/r/', '<a href="https://reddit.com/r/'
    ))
    html = html.replace("<!--score-->", str(comment.score))
    html = html.replace("<!--link-->", f"https://reddit.com{comment.permalink}")
    html = html.replace("<!--timestamp-->", str(dt))
    html = html.replace("<!--id-->", comment.id)
    html = html.replace("<!--date-->", dt.strftime("%H:%M - %d %B, %Y"))
    if children:
        children_html = []
        for child in comment.replies:
            children_html.append(get_comment_html(child, children=False, op=op))
        html = html.replace("<!--children-->", "\n".join(children_html))
    return html


def save_html(posts, comments, location, html_file, page, has_next, username=None):
    if username:
        with open(os.path.join("html", "username.html"), encoding="utf-8") as f:
            html = f.read().replace("[username]", username)
    else:
        with open(os.path.join("html", html_file), encoding="utf-8") as f:
            html = f.read()
    with open(os.path.join("html", "style.css"), encoding="utf-8") as f:
        html = html.replace("<style></style>", f"<style>\n{f.read()}\n</style>")
    with open(os.path.join("html", "main.js"), encoding="utf-8") as f:
        html = html.replace("<script></script>", f"<script>\n{f.read()}\n</script>")
    if page == 0 or page is None:
        html = html.replace("Previous</a>", "</a>")
    else:
        html = html.replace(".p.html", f".{page-1}.html")
    if not has_next or page is None:
        html = html.replace("Next</a>", "</a>")
    else:
        html = html.replace(".n.html", f".{page+1}.html")
    html = html.replace("<!--posts-->", "\n".join(posts))
    html = html.replace("<!--comments-->", "\n".join(comments))
    file_name = html_file if page is None else html_file.replace(".html", f".{page}.html")
    with open(os.path.join(location, file_name), "w", encoding="utf-8") as f:
        f.write(html)