"""Handles /live/view/* OSC addresses (UI navigation)."""
import logging
from typing import Optional
from .handler import AbletonOSCHandler

logger = logging.getLogger(__name__)


class ViewHandler(AbletonOSCHandler):
    def init_api(self) -> None:
        self.clear_listeners()
        view = self._song_view()

        # selected scene
        self._add("/live/view/get/selected_scene", self._get_selected_scene)
        self._add("/live/view/set/selected_scene", self._set_selected_scene)
        self._add("/live/view/start_listen/selected_scene", self._start_listen_selected_scene)
        self._add("/live/view/stop_listen/selected_scene", self._stop_listen_selected_scene)

        # selected track
        self._add("/live/view/get/selected_track", self._get_selected_track)
        self._add("/live/view/set/selected_track", self._set_selected_track)
        self._add("/live/view/start_listen/selected_track", self._start_listen_selected_track)
        self._add("/live/view/stop_listen/selected_track", self._stop_listen_selected_track)

        # selected clip
        self._add("/live/view/get/selected_clip", self._get_selected_clip)
        self._add("/live/view/set/selected_clip", self._set_selected_clip)

        # selected device
        self._add("/live/view/get/selected_device", self._get_selected_device)

        # focus
        self._add("/live/view/show_clip_detail_view", self._show_clip_detail_view)
        self._add("/live/view/show_device_detail_view", self._show_device_detail_view)
        self._add("/live/view/focus_browser", self._focus_browser)

        # arrangement / session toggle
        self._add("/live/view/get/focused_document_view", self._get_focused_document_view)

    # ------------------------------------------------------------------

    def _song_view(self):
        try:
            return self.song.view
        except Exception:
            return None

    def _get_selected_scene(self, params: tuple) -> Optional[tuple]:
        try:
            view = self._song_view()
            scenes = list(self.song.scenes)
            scene = view.selected_scene
            idx = scenes.index(scene)
            return (idx,)
        except Exception as e:
            logger.warning("get selected_scene: %s", e)
            return None

    def _set_selected_scene(self, params: tuple) -> None:
        if not params:
            return None
        try:
            idx = int(params[0])
            scenes = list(self.song.scenes)
            if 0 <= idx < len(scenes):
                self._song_view().selected_scene = scenes[idx]
        except Exception as e:
            logger.warning("set selected_scene: %s", e)
        return None

    def _start_listen_selected_scene(self, params: tuple) -> None:
        view = self._song_view()
        if view is None:
            return
        key = "view.selected_scene"
        self._remove_listener(key)

        def cb():
            result = self._get_selected_scene(())
            if result:
                self._send("/live/view/get/selected_scene", result)

        try:
            view.add_selected_scene_listener(cb)
            self._listener_store[key] = (view.remove_selected_scene_listener, cb)
            cb()
        except Exception as e:
            logger.warning("selected_scene listener: %s", e)

    def _stop_listen_selected_scene(self, params: tuple) -> None:
        self._remove_listener("view.selected_scene")

    def _get_selected_track(self, params: tuple) -> Optional[tuple]:
        try:
            view = self._song_view()
            all_tracks = list(self.song.tracks) + list(self.song.return_tracks)
            track = view.selected_track
            idx = all_tracks.index(track)
            return (idx,)
        except Exception as e:
            logger.warning("get selected_track: %s", e)
            return None

    def _set_selected_track(self, params: tuple) -> None:
        if not params:
            return None
        try:
            idx = int(params[0])
            all_tracks = list(self.song.tracks) + list(self.song.return_tracks)
            if 0 <= idx < len(all_tracks):
                self._song_view().selected_track = all_tracks[idx]
        except Exception as e:
            logger.warning("set selected_track: %s", e)
        return None

    def _start_listen_selected_track(self, params: tuple) -> None:
        view = self._song_view()
        if view is None:
            return
        key = "view.selected_track"
        self._remove_listener(key)

        def cb():
            result = self._get_selected_track(())
            if result:
                self._send("/live/view/get/selected_track", result)

        try:
            view.add_selected_track_listener(cb)
            self._listener_store[key] = (view.remove_selected_track_listener, cb)
            cb()
        except Exception as e:
            logger.warning("selected_track listener: %s", e)

    def _stop_listen_selected_track(self, params: tuple) -> None:
        self._remove_listener("view.selected_track")

    def _get_selected_clip(self, params: tuple) -> Optional[tuple]:
        try:
            view = self._song_view()
            clip_view = view.detail_clip
            if clip_view is None:
                return None
            tracks = list(self.song.tracks)
            for ti, track in enumerate(tracks):
                for ci, slot in enumerate(track.clip_slots):
                    if slot.has_clip and slot.clip == clip_view:
                        return (ti, ci)
        except Exception as e:
            logger.warning("get selected_clip: %s", e)
        return None

    def _set_selected_clip(self, params: tuple) -> None:
        if len(params) < 2:
            return None
        try:
            track_idx = int(params[0])
            clip_idx = int(params[1])
            tracks = list(self.song.tracks)
            if 0 <= track_idx < len(tracks):
                slots = list(tracks[track_idx].clip_slots)
                if 0 <= clip_idx < len(slots) and slots[clip_idx].has_clip:
                    self._song_view().detail_clip = slots[clip_idx].clip
        except Exception as e:
            logger.warning("set selected_clip: %s", e)
        return None

    def _get_selected_device(self, params: tuple) -> Optional[tuple]:
        try:
            view = self._song_view()
            track = view.selected_track
            tracks = list(self.song.tracks) + list(self.song.return_tracks)
            track_idx = tracks.index(track)
            selected = track.view.selected_device
            if selected is None:
                return None
            devices = list(track.devices)
            device_idx = devices.index(selected)
            return (track_idx, device_idx)
        except Exception as e:
            logger.warning("get selected_device: %s", e)
            return None

    def _show_clip_detail_view(self, params: tuple) -> None:
        try:
            app = self.manager.application()
            app.view.show_view("Detail/Clip")
        except Exception as e:
            logger.warning("show_clip_detail_view: %s", e)
        return None

    def _show_device_detail_view(self, params: tuple) -> None:
        try:
            app = self.manager.application()
            app.view.show_view("Detail/DeviceChain")
        except Exception as e:
            logger.warning("show_device_detail_view: %s", e)
        return None

    def _focus_browser(self, params: tuple) -> None:
        try:
            app = self.manager.application()
            app.view.show_view("Browser")
        except Exception as e:
            logger.warning("focus_browser: %s", e)
        return None

    def _get_focused_document_view(self, params: tuple) -> Optional[tuple]:
        try:
            app = self.manager.application()
            view = app.view.focused_document_view
            return (view,)
        except Exception as e:
            logger.warning("get focused_document_view: %s", e)
            return None