from gi import require_version
from trio import CancelScope, open_process, run_process

from dropship.logger import log

require_version("Gtk", "3.0")
require_version("Gdk", "3.0")

from gi.repository import Gdk, GLib, Gtk

from dropship.constant import UI_DIR
from dropship.transfer import PendingTransfer
from dropship.ui_templates import PendingTransferRow
from dropship.wormhole import wormhole_recv, wormhole_send


class DropShip:
    """Drag it, drop it, ship it."""

    def __init__(self, nursery):
        """Object initialisation."""
        self.GLADE_FILE = f"{UI_DIR}/dropship.ui"
        self.CSS_FILE = f"{UI_DIR}/dropship.css"

        self.clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD)
        self.nursery = nursery

        self.init_glade()
        self.init_css()
        self.init_ui_elements()
        self.init_window()

    def init_glade(self):
        """Initialise the GUI from Glade file."""
        self.builder = Gtk.Builder()
        self.builder.add_from_file(self.GLADE_FILE)
        self.builder.connect_signals(self)

    def init_css(self):
        """Initialise CSS injection."""
        self.screen = Gdk.Screen.get_default()
        self.provider = Gtk.CssProvider()
        self.provider.load_from_path(self.CSS_FILE)
        Gtk.StyleContext.add_provider_for_screen(
            self.screen, self.provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
        )

    def init_window(self):
        """Initialise the Main GUI window."""
        self.main_window_id = "mainWindow"
        self.window = self.builder.get_object(self.main_window_id)
        self.window.connect("delete-event", Gtk.main_quit)
        self.window.show()

    def init_ui_elements(self):
        """Initialize the UI elements."""

        # Send UI
        # Drag & Drop Box
        self.files_to_send = ""
        self.enforce_target = Gtk.TargetEntry.new(
            "text/uri-list", Gtk.TargetFlags(4), 129
        )

        self.drop_box = self.builder.get_object("dropBox")
        self.drop_box.drag_dest_set(
            Gtk.DestDefaults.ALL, [self.enforce_target], Gdk.DragAction.COPY
        )
        self.drop_box.connect("drag-data-received", self.on_drop)
        self.drop_label = self.builder.get_object("dropLabel")
        self.drop_spinner = self.builder.get_object("dropSpinner")

        # File chooser
        self.file_chooser = self.builder.get_object("filePicker")
        self.file_chooser.add_buttons(
            "Cancel", Gtk.ResponseType.CANCEL, "Add", Gtk.ResponseType.OK
        )

        # Receive UI
        # Code entry box
        self.recv_box = self.builder.get_object("receiveBoxCodeEntry")
        self.recv_box.connect("activate", self.on_recv)

        # Pending Transfers UI
        self.pending_transfers_list = self.builder.get_object(
            "pendingTransfersList"
        )

    def on_drop(self, widget, drag_context, x, y, data, info, time):
        """Handler for file dropping."""
        files = data.get_uris()
        self.files_to_send = files
        if len(files) == 1:
            fpath = files[0].replace("file://", "")
            self.nursery.start_soon(self.send, fpath)
        else:
            log.info("Multiple file sending coming soon ™")

    def on_recv(self, entry):
        """Handler for receiving transfers."""
        self.nursery.start_soon(self.receive, entry.get_text())

    def add_files(self, widget, event):
        """Handler for adding files with system interface"""
        response = self.file_chooser.run()
        if response == Gtk.ResponseType.OK:
            fpath = self.file_chooser.get_filenames()[0]
            self.nursery.start_soon(self.send, fpath)
        self.file_chooser.hide()

    def _send_spinner_on(self):
        """Turn spinner on for sending interaction."""
        self.drop_label.set_visible(False)
        self.drop_label.set_vexpand(False)
        self.drop_spinner.set_vexpand(True)
        self.drop_spinner.set_visible(True)
        self.drop_spinner.start()

    def _send_spinner_off(self, code):
        """Turn spinner off for sending interaction."""
        self.drop_label.set_text(code)
        self.drop_label.set_visible(True)
        self.drop_label.set_selectable(True)
        self.drop_spinner.stop()
        self.drop_spinner.set_vexpand(False)
        self.drop_spinner.set_visible(False)

    def _create_pending_transfer(self, fpath, code, scope):
        """Create a new pending transfer."""
        transfer = PendingTransfer(fpath, code, scope)
        template = PendingTransferRow(transfer, self)
        self.pending_transfers_list.insert(template, -1)

    def _remove_pending_transfer(self, code):
        """Remove pending transfer."""
        for pending_transfer in self.pending_transfers_list:
            if pending_transfer.code == code:
                pending_transfer.cancel()

    async def send(self, fpath):
        self._send_spinner_on()
        code, scope = await self.nursery.start(wormhole_send, fpath, self)
        self._create_pending_transfer(fpath, code, scope)
        self.clipboard.set_text(code, -1)
        self._send_spinner_off(code)
        log.info(f"send: successfully initiated transfer send ({code})")

    async def receive(self, code):
        await self.nursery.start(wormhole_recv, code, self)
        log.info(f"send: successfully initiated receive ({code})")