# mautrix-signal - A Matrix-Signal puppeting bridge
# Copyright (C) 2020 Tulir Asokan
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
import io

from mausignald.errors import UnexpectedResponse
from mausignald.types import Account

from mautrix.types import MediaMessageEventContent, MessageType, ImageInfo

from . import command_handler, CommandEvent, SECTION_AUTH
from .. import puppet as pu

try:
    import qrcode
    import PIL as _
except ImportError:
    qrcode = None


@command_handler(needs_auth=False, management_only=True, help_section=SECTION_AUTH,
                 help_text="Link the bridge as a secondary device", help_args="[device name]")
async def link(evt: CommandEvent) -> None:
    if qrcode is None:
        await evt.reply("Can't generate QR code: qrcode and/or PIL not installed")
        return
    # TODO make default device name configurable
    device_name = " ".join(evt.args) or "Mautrix-Signal bridge"

    async def callback(uri: str) -> None:
        buffer = io.BytesIO()
        image = qrcode.make(uri)
        size = image.pixel_size
        image.save(buffer, "PNG")
        qr = buffer.getvalue()
        mxc = await evt.az.intent.upload_media(qr, "image/png", "link-qr.png", len(qr))
        content = MediaMessageEventContent(body=uri, url=mxc, msgtype=MessageType.IMAGE,
                                           info=ImageInfo(mimetype="image/png", size=len(qr),
                                                          width=size, height=size))
        await evt.az.intent.send_message(evt.room_id, content)

    account = await evt.bridge.signal.link(callback, device_name=device_name)
    await evt.sender.on_signin(account)
    await evt.reply(f"Successfully logged in as {pu.Puppet.fmt_phone(evt.sender.username)}")


@command_handler(needs_auth=False, management_only=True, help_section=SECTION_AUTH,
                 help_text="Sign into Signal as the primary device", help_args="<phone>")
async def register(evt: CommandEvent) -> None:
    if len(evt.args) == 0:
        await evt.reply("**Usage**: $cmdprefix+sp register <phone>")
        return
    phone = evt.args[0]
    if not phone.startswith("+") or not phone[1:].isdecimal():
        await evt.reply(f"Please enter the phone number in international format (E.164)")
        return
    resp = await evt.bridge.signal.request("register", "verification_required")
    evt.sender.command_status = {
        "action": "Register",
        "room_id": evt.room_id,
        "next": enter_register_code,
        "username": resp["username"],
    }
    await evt.reply("Register SMS requested, please enter the code here.")


async def enter_register_code(evt: CommandEvent) -> None:
    try:
        username = evt.sender.command_status["username"]
        resp = await evt.bridge.signal.request("verify", "verification_succeeded",
                                               code=evt.args[0], username=username)
    except UnexpectedResponse as e:
        if e.resp_type == "error":
            await evt.reply(e.data)
        else:
            raise
    else:
        account = Account.deserialize(resp)
        await evt.sender.on_signin(account)
        await evt.reply(f"Successfully logged in as {pu.Puppet.fmt_phone(evt.sender.username)}")