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+# Copyright (c) 2020 Tulir Asokan
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from typing import Dict, TypedDict
+from io import BytesIO
+import argparse
+import os.path
+import asyncio
+import json
+import re
+
+from aiohttp import ClientSession
+from yarl import URL
+from PIL import Image
+
+from telethon import TelegramClient
+from telethon.tl.functions.messages import GetAllStickersRequest, GetStickerSetRequest
+from telethon.tl.types.messages import AllStickers
+from telethon.tl.types import InputStickerSetShortName, Document
+from telethon.tl.types.messages import StickerSet as StickerSetFull
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--list", help="List your saved sticker packs", action="store_true")
+parser.add_argument("--session", help="Telethon session file name", default="sticker-import")
+parser.add_argument("--config", help="Path to JSON file with Matrix homeserver and access_token",
+                    type=str, default="config.json")
+parser.add_argument("--output-dir", help="Directory to write packs to", default="web/packs/",
+                    type=str)
+parser.add_argument("pack", help="Sticker pack URLs to import", action="append", nargs="*")
+args = parser.parse_args()
+
+with open(args.config) as config_file:
+    config = json.load(config_file)
+    homeserver_url = config["homeserver"]
+    upload_url = URL(homeserver_url) / "_matrix" / "media" / "r0" / "upload"
+    access_token = config["access_token"]
+
+
+async def upload(data: bytes, mimetype: str, filename: str) -> str:
+    url = upload_url.with_query({"filename": filename})
+    headers = {"Content-Type": mimetype, "Authorization": f"Bearer {access_token}"}
+    async with ClientSession() as sess, sess.post(url, data=data, headers=headers) as resp:
+        return (await resp.json())["content_uri"]
+
+
+class MatrixMediaInfo(TypedDict):
+    w: int
+    h: int
+    size: int
+    mimetype: str
+
+
+class MatrixStickerInfo(TypedDict, total=False):
+    body: str
+    url: str
+    info: MatrixMediaInfo
+
+
+def convert_image(data: bytes) -> (bytes, int, int):
+    image: Image.Image = Image.open(BytesIO(data)).convert("RGBA")
+    image.thumbnail((256, 256), Image.ANTIALIAS)
+    new_file = BytesIO()
+    image.save(new_file, "png")
+    w, h = image.size
+    return new_file.getvalue(), w, h
+
+
+async def reupload_document(client: TelegramClient, document: Document) -> MatrixStickerInfo:
+    print(f"Reuploading {document.id}", end="", flush=True)
+    data = await client.download_media(document, file=bytes)
+    print(".", end="", flush=True)
+    data, width, height = convert_image(data)
+    print(".", end="", flush=True)
+    mxc = await upload(data, "image/png", f"{document.id}.png")
+    print(".", flush=True)
+    return {
+        "body": "",
+        "url": mxc,
+        "info": {
+            "w": width,
+            "h": height,
+            "size": len(data),
+            "mimetype": "image/png",
+        },
+    }
+
+
+def add_to_index(name: str) -> None:
+    index_path = os.path.join(args.output_dir, "index.json")
+    try:
+        with open(index_path) as index_file:
+            index_data = json.load(index_file)
+    except (FileNotFoundError, json.JSONDecodeError):
+        index_data = {"packs": [], "homeserver_url": homeserver_url}
+    if name not in index_data["packs"]:
+        index_data["packs"].append(name)
+        with open(index_path, "w") as index_file:
+            json.dump(index_data, index_file, indent="  ")
+        print(f"Added {name} to {index_path}")
+
+
+async def reupload_pack(client: TelegramClient, pack: StickerSetFull) -> None:
+    if pack.set.animated:
+        print("Animated stickerpacks are currently not supported")
+        return
+
+    pack_path = os.path.join(args.output_dir, f"{pack.set.short_name}.json")
+    try:
+        os.mkdir(os.path.dirname(pack_path))
+    except FileExistsError:
+        pass
+
+    print(f"Reuploading {pack.set.title} with {pack.set.count} stickers "
+          f"and writing output to {pack_path}")
+
+    already_uploaded = {}
+    try:
+        with open(pack_path) as pack_file:
+            existing_pack = json.load(pack_file)
+            already_uploaded = {sticker["net.maunium.telegram.sticker"]["id"]: sticker
+                                for sticker in existing_pack["stickers"]}
+            print(f"Found {len(already_uploaded)} already reuploaded stickers")
+    except FileNotFoundError:
+        pass
+
+    reuploaded_documents: Dict[int, MatrixStickerInfo] = {}
+    for document in pack.documents:
+        try:
+            reuploaded_documents[document.id] = already_uploaded[document.id]
+            print(f"Skipped reuploading {document.id}")
+        except KeyError:
+            reuploaded_documents[document.id] = await reupload_document(client, document)
+
+    for sticker in pack.packs:
+        for document_id in sticker.documents:
+            doc = reuploaded_documents[document_id]
+            doc["body"] = sticker.emoticon
+            doc["net.maunium.telegram.sticker"] = {
+                "pack": {
+                    "id": pack.set.id,
+                    "short_name": pack.set.short_name,
+                },
+                "id": document_id,
+                "emoticon": sticker.emoticon,
+            }
+
+    with open(pack_path, "w") as pack_file:
+        json.dump({
+            "title": pack.set.title,
+            "short_name": pack.set.short_name,
+            "id": pack.set.id,
+            "hash": pack.set.hash,
+            "stickers": list(reuploaded_documents.values()),
+        }, pack_file, ensure_ascii=False)
+
+    add_to_index(os.path.basename(pack_path))
+
+
+pack_url_regex = re.compile(r"^(?:(?:https?://)?(?:t|telegram)\.(?:me|dog)/addstickers/)?"
+                            r"([A-Za-z0-9-_]+)"
+                            r"(?:\.json)?$")
+
+
+async def main():
+    client = TelegramClient(args.session, 298751, "cb676d6bae20553c9996996a8f52b4d7")
+    await client.start()
+
+    if args.list:
+        stickers: AllStickers = await client(GetAllStickersRequest(hash=0))
+        index = 1
+        width = len(str(stickers.sets))
+        print("Your saved sticker packs:")
+        for saved_pack in stickers.sets:
+            print(f"{index:>{width}}. {saved_pack.title} "
+                  f"(t.me/addstickers/{saved_pack.short_name})")
+    elif args.pack[0]:
+        input_packs = []
+        for pack_url in args.pack[0]:
+            match = pack_url_regex.match(pack_url)
+            if not match:
+                print(f"'{pack_url}' doesn't look like a sticker pack URL")
+                return
+            input_packs.append(InputStickerSetShortName(short_name=match.group(1)))
+        for input_pack in input_packs:
+            pack: StickerSetFull = await client(GetStickerSetRequest(input_pack))
+            await reupload_pack(client, pack)
+            print(f"Saved {pack.set.title} as {pack.set.short_name}.json")
+    else:
+        parser.print_help()
+
+
+asyncio.run(main())