# 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, Optional
from hashlib import sha256
import mimetypes
import argparse
import os.path
import asyncio
import string
import json

try:
    import magic
except ImportError:
    print("[Warning] Magic is not installed, using file extensions to guess mime types")
    magic = None

from .lib import matrix, util


def convert_name(name: str) -> str:
    name_translate = {
        ord(" "): ord("_"),
    }
    allowed_chars = string.ascii_letters + string.digits + "_-/.#"
    return "".join(filter(lambda char: char in allowed_chars, name.translate(name_translate)))


async def upload_sticker(file: str, directory: str, old_stickers: Dict[str, matrix.StickerInfo]
                         ) -> Optional[matrix.StickerInfo]:
    if file.startswith("."):
        return None
    path = os.path.join(directory, file)
    if not os.path.isfile(path):
        return None

    if magic:
        mime = magic.from_file(path, mime=True)
    else:
        mime, _ = mimetypes.guess_type(file)
    if not mime.startswith("image/"):
        return None

    print(f"Processing {file}", end="", flush=True)
    try:
        with open(path, "rb") as image_file:
            image_data = image_file.read()
    except Exception as e:
        print(f"... failed to read file: {e}")
        return None
    name = os.path.splitext(file)[0]

    # If the name starts with "number-", remove the prefix
    name_split = name.split("-", 1)
    if len(name_split) == 2 and name_split[0].isdecimal():
        name = name_split[1]

    sticker_id = f"sha256:{sha256(image_data).hexdigest()}"
    print(".", end="", flush=True)
    if sticker_id in old_stickers:
        sticker = {
            **old_stickers[sticker_id],
            "body": name,
        }
        print(f".. using existing upload")
    else:
        image_data, width, height = util.convert_image(image_data)
        print(".", end="", flush=True)
        mxc = await matrix.upload(image_data, "image/png", file)
        print(".", end="", flush=True)
        sticker = util.make_sticker(mxc, width, height, len(image_data), name)
        sticker["id"] = sticker_id
        print(" uploaded", flush=True)
    return sticker


async def main(args: argparse.Namespace) -> None:
    await matrix.load_config(args.config)

    dirname = os.path.basename(os.path.abspath(args.path))
    meta_path = os.path.join(args.path, "pack.json")
    try:
        with open(meta_path) as pack_file:
            pack = json.load(pack_file)
            print(f"Loaded existing pack meta from {meta_path}")
    except FileNotFoundError:
        pack = {
            "title": args.title or dirname,
            "id": args.id or convert_name(dirname),
            "stickers": [],
        }
        old_stickers = {}
    else:
        old_stickers = {sticker["id"]: sticker for sticker in pack["stickers"]}
        pack["stickers"] = []

    for file in sorted(os.listdir(args.path)):
        sticker = await upload_sticker(file, args.path, old_stickers=old_stickers)
        if sticker:
            pack["stickers"].append(sticker)

    with open(meta_path, "w") as pack_file:
        json.dump(pack, pack_file)
    print(f"Wrote pack to {meta_path}")

    if args.add_to_index:
        picker_file_name = f"{pack['id']}.json"
        picker_pack_path = os.path.join(args.add_to_index, picker_file_name)
        with open(picker_pack_path, "w") as pack_file:
            json.dump(pack, pack_file)
        print(f"Copied pack to {picker_pack_path}")
        util.add_to_index(picker_file_name, args.add_to_index)


parser = argparse.ArgumentParser()
parser.add_argument("--config",
                    help="Path to JSON file with Matrix homeserver and access_token",
                    type=str, default="config.json", metavar="file")
parser.add_argument("--title", help="Override the sticker pack displayname", type=str,
                    metavar="title")
parser.add_argument("--id", help="Override the sticker pack ID", type=str, metavar="id")
parser.add_argument("--add-to-index", help="Sticker picker pack directory (usually 'web/packs/')",
                    type=str, metavar="path")
parser.add_argument("path", help="Path to the sticker pack directory", type=str)


def cmd():
    asyncio.get_event_loop().run_until_complete(main(parser.parse_args()))


if __name__ == "__main__":
    cmd()