import os
import pprint
import traceback
import typing

import requests.exceptions
import validators

import utils
import flet as ft

from typing import DefaultDict

import pygame

import nn_model_manager as mm
import whisper_webservice_interface

import wave
import sys
import pyaudio


# === TEMP ===
import logging

logging.basicConfig()
logging.getLogger("faster_whisper").setLevel(logging.DEBUG)

# === END ===


# globals
transcribe_ready: bool = False
recording: bool = False
rec_stream: pyaudio.Stream | None = None
sound_chunks = []
recorded_audio = []

# AUDIO stuff
REC_CHUNK = 1024
REC_FORMAT = pyaudio.paInt16
REC_CHANNELS = 1
REC_RATE = 16000
REC_RECORD_SECONDS = 5


def main(page):
    pygame.mixer.init()

    # get audio device names
    p = pyaudio.PyAudio()

    capture_devices = [(i, p.get_device_info_by_index(i)['name']) for i in range(p.get_device_count()) if
                       p.get_device_info_by_index(i)['maxInputChannels'] > 0]

    record_button = ft.Ref[ft.IconButton]()
    mic_select = ft.Ref[ft.Dropdown]()

    file_tree = ft.Ref[ft.Column]()
    file_tree_empty_text = ft.Ref[ft.Text]()

    # mode select
    current_mode_select = ft.Ref[ft.Dropdown]()
    current_mode_info_text = ft.Ref[ft.Text]()
    processing_spinner = ft.Ref[ft.ProgressRing]()

    # local model mode
    model_size_select = ft.Ref[ft.Dropdown]()
    model_device_select = ft.Ref[ft.Dropdown]()
    # model_bits_select = ft.Ref[ft.Dropdown]()
    model_load_unload_button = ft.Ref[ft.IconButton]()

    # docker whisper webservice mode
    whisper_webservice_url_input = ft.Ref[ft.TextField]()

    transcribe_buttons: list[ft.Ref[ft.IconButton]] = []

    output_text_container = ft.Ref[ft.Container]()
    output_text_col = ft.Ref[ft.Column]()

    # last opened folders


    def transcribe(fileOrBytes: str | bytes):
        print(f"DEBUG: trying to transcribe audio {fileOrBytes if isinstance(fileOrBytes, str) else f'with len {len(fileOrBytes)}'}")

        # === LOCAL MODEL CODE ===
        if current_mode_select.current.value == 'local':
            if not mm.is_model_loaded() or (isinstance(fileOrBytes, str) and not fileOrBytes.endswith('.mp3')):
                print("DEBUG: can't transcribe a non-MP3 file or while no model is loaded")
                return

            print(f"DEBUG: starting transcription")
            output_text_container.current.alignment = ft.alignment.center
            output_text_col.current.controls = [ft.ProgressRing()]

            # set all transcribe buttons to disabled
            for btn in transcribe_buttons:
                btn.current.disabled = True
            page.update()

            try:
                if isinstance(fileOrBytes, str):
                    segments, info = mm.transcribe_from_file(fileOrBytes)
                else:
                    segments, info = mm.transcribe_from_i16_audio(fileOrBytes)

                txt = ''

                for seg in segments:
                    txt += seg.text + '\n'

                output_text_container.current.alignment = ft.alignment.top_left
                output_text_col.current.controls = [ft.Text(txt, selectable=True)]  # TODO

            except Exception as e:
                output_text_container.current.alignment = ft.alignment.center
                output_text_col.current.controls = [ft.Text(f"Transcribing failed: {str(e)}")]  # TODO

            finally:
                # set all transcribe buttons to disabled
                for btn in transcribe_buttons:
                    btn.current.disabled = False
                page.update()

        # === WEBSERVICE MODE CODE ===
        elif current_mode_select.current.value == 'webservice':
            url = whisper_webservice_url_input.current.value
            print(f"DEBUG: starting web transcription")
            if validators.url(url, simple_host=True):

                output_text_container.current.alignment = ft.alignment.center
                output_text_col.current.controls = [ft.ProgressRing()]
                # set all transcribe buttons to disabled
                for btn in transcribe_buttons:
                    btn.current.disabled = True
                page.update()

                try:
                    print(f'DEBUG: sending web request...')
                    code, text = whisper_webservice_interface.send_asr_request(url, fileOrBytes, task="transcribe")
                except requests.exceptions.RequestException as e:
                    output_text_container.current.alignment = ft.alignment.center
                    print(f'web transcription failed: {str(e)}')
                    output_text_col.current.controls = \
                        [ft.Text(f"HTTP Request to {url}/asr failed. Reason:\n{str(e)}")]
                    # set all transcribe buttons to enabled
                    for btn in transcribe_buttons:
                        btn.current.disabled = False
                    page.update()
                    return

                # set all transcribe buttons to enabled
                for btn in transcribe_buttons:
                    btn.current.disabled = False

                if code == 200:
                    output_text_container.current.alignment = ft.alignment.top_left
                    output_text_col.current.controls = [ft.Text(text, selectable=True)]
                else:
                    output_text_container.current.alignment = ft.alignment.center
                    output_text_col.current.controls = \
                        [ft.Text(f"HTTP Request to {url}/asr failed ({code}):\n{text}")]

                page.update()

    def generate_file_tree(path: str, tree_dict: dict | DefaultDict):
        if path[-1] == os.sep:
            path = path[:-1]

        folder_name = utils.get_last_segment(path)
        print(f"DEBUG: generating tree for folder {folder_name}")

        # find folders, and add dict for each
        print(f"adding name {folder_name} to ui")

        controls = [
            ft.Row(
                [
                    ft.Icon(ft.icons.FOLDER, color=ft.colors.BLUE),
                    ft.Text(folder_name, size=14, weight=ft.FontWeight.BOLD),
                ]
            )
        ]

        for folder_name, value in tree_dict.items():
            if folder_name == utils.FILES_KEY or folder_name == '.':
                continue  # skip for now

            controls.append(generate_file_tree(path + os.sep + folder_name, value))

        # now folders are there, let's do files
        if utils.FILES_KEY not in tree_dict and '.' in tree_dict:
            tree_dict = tree_dict['.']  # if root dir, enter root dir (.) directory

        files_controls = []

        for file in tree_dict[utils.FILES_KEY]:
            control = [ft.Text(file)]

            if not file.endswith('.mp3'):
                continue

            def start_playing(filepath: str, button_ref: ft.Ref[ft.IconButton]):
                print(f"trying to play {filepath}...")
                if pygame.mixer.music.get_busy() or not os.path.isfile(filepath):
                    return

                print("starting playback")

                pygame.mixer.music.load(filepath)
                pygame.mixer.music.play()

                button_ref.current.icon = ft.icons.PAUSE_CIRCLE_FILLED_OUTLINED
                button_ref.current.on_click = lambda _, f=filepath, r=button_ref: stop_playing(f, r)
                page.update()

            def stop_playing(filepath: str, button_ref: ft.Ref[ft.IconButton]):
                print("stopping playback")

                pygame.mixer.music.stop()

                button_ref.current.icon = ft.icons.PLAY_CIRCLE_OUTLINED
                button_ref.current.on_click = lambda _, f=filepath, r=button_ref: start_playing(f, r)
                page.update()

            full_file_path = path + os.sep + file

            _button_ref = ft.Ref[ft.IconButton]()

            control.append(ft.IconButton(icon=ft.icons.PLAY_CIRCLE_OUTLINED, ref=_button_ref,
                                         on_click=lambda _, f=full_file_path, r=_button_ref: start_playing(f, r)))

            transcribe_button_ref = ft.Ref[ft.IconButton]()

            # check enabled
            enabled = (current_mode_select.current.value == 'local' and mm.is_model_loaded()) or (
                    current_mode_select.current.value == 'webservice' and
                    validators.url(whisper_webservice_url_input.current.value, simple_host=True))

            control.append(ft.IconButton(icon=ft.icons.FORMAT_ALIGN_LEFT, disabled=not enabled,
                                         ref=transcribe_button_ref,
                                         on_click=lambda _, f=full_file_path: transcribe(f)))

            transcribe_buttons.append(transcribe_button_ref)

            files_controls.append(ft.Row(control))

        if len(files_controls) == 0:
            files_controls.append(ft.Text('No mp3 Files found', color='grey'))

        return ft.Row([
            ft.VerticalDivider(),
            ft.Column(controls + [ft.Row([ft.VerticalDivider(), ft.Column(files_controls)])])
        ]
        )

    def on_dialog_result(e: ft.FilePickerResultEvent | str):
        if isinstance(e, ft.FilePickerResultEvent):
            path = e.path
        else:
            path = e
        if path:
            print(f"path is {path}")
            try:
                if os.path.isdir(path):
                    tree = utils.build_file_tree(path)

                    if '.' in tree:  # if there is actually a proper file tree
                        # add to view
                        file_tree.current.controls.append(
                            generate_file_tree(path, utils.defaultdict_to_dict(tree))
                        )
                        file_tree_empty_text.current.visible = False

                    # add to last opened folders

                    last_opened_folders = page.client_storage.get('last_opened_folders') if page.client_storage.contains_key(
                        'last_opened_folders') else []

                    if path not in last_opened_folders:
                        last_opened_folders.append(path)
                        last_opened_folders = last_opened_folders[-10:]
                        page.client_storage.set('last_opened_folders', last_opened_folders)

                    page.update()
            except Exception as e:
                print(f"An error occurred when building the file tree: {str(e)}")
                

    def mode_select():
        global transcribe_ready
        if mm.is_model_loaded():
            print("BUG: cannot change mode while model is loaded!")
            return

        next_mode = current_mode_select.current.value
        if next_mode == 'local':
            # enable model selects & loads
            model_size_select.current.visible = True
            model_device_select.current.visible = True
            model_load_unload_button.current.visible = True
            model_size_select.current.disabled = False
            model_device_select.current.disabled = False

            whisper_webservice_url_input.current.visible = False

            for btn in transcribe_buttons:
                btn.current.disabled = True

            set_transcribe_ready(False)

        elif next_mode == 'webservice':
            # enable model selects & loads
            model_size_select.current.visible = False
            model_device_select.current.visible = False
            model_load_unload_button.current.visible = False
            model_size_select.current.disabled = True
            model_device_select.current.disabled = True
            model_load_unload_button.current.disabled = True
            current_mode_info_text.current.value = 'Input the URL of the onerahmet/openai-whisper-asr-webservice docker container'

            whisper_webservice_url_input.current.visible = True
            whisper_webservice_url_input.current.disabled = False

            on_url_input(None)


        else:
            raise Exception(f'BUG: Impossible mode {next_mode} received!')

        page.update()
        page.client_storage.set('selected_mode', next_mode)

    def load_model():
        current_mode_info_text.current.value = 'Loading... This may take a while.'

        page.update()

        paralyze_ui()

        try:
            mm.set_model(
                size=model_size_select.current.value or 'base',
                device=model_device_select.current.value or 'auto',
                # compute_type=model_bits_select.current.value or '16bit',
            )
        except Exception as e:
            print(f"loading model failed. Exception: {str(e)}")
            print(traceback.format_exc())
            current_mode_info_text.current.value = f'Loading failed. Reason:\n{str(e)}'
            set_transcribe_ready(False)

            # raise e

        processing_spinner.current.visible = False

        if mm.is_model_loaded():
            current_mode_info_text.current.value = f'Loaded.'

            # if successful, save to shared preferences
            page.client_storage.set('model_size', model_size_select.current.value)
            page.client_storage.set('device_select', model_device_select.current.value)

            # set all transcribe buttons to enabled
            set_transcribe_ready(True)
        else:
            set_transcribe_ready(False)

    def unload_model():
        # set all transcribe buttons to disabled
        paralyze_ui()

        if mm.is_model_loaded():
            mm.unload_model()

        set_transcribe_ready(False)

    def paralyze_ui(spinner: bool = True, disable_recording_button: bool = True):
        model_size_select.current.disabled = True
        model_device_select.current.disabled = True
        # model_bits_select.current.disabled = True
        model_load_unload_button.current.disabled = True
        processing_spinner.current.visible = spinner
        current_mode_select.current.disabled = True

        record_button.current.disabled = disable_recording_button

        model_load_unload_button.current.icon = ft.icons.CLOSE
        model_load_unload_button.current.disabled = False
        for btn in transcribe_buttons:
            btn.current.disabled = True
        model_load_unload_button.current.disabled = True
        page.update()

    def set_transcribe_ready(rdy: bool):
        global transcribe_ready
        transcribe_ready = rdy

        if transcribe_ready:
            for btn in transcribe_buttons:
                btn.current.disabled = False
            model_size_select.current.disabled = True
            model_device_select.current.disabled = True
            # model_bits_select.current.disabled = True
            model_load_unload_button.current.disabled = True
            processing_spinner.current.visible = False
            model_load_unload_button.current.on_click = lambda _: unload_model()

            model_load_unload_button.current.icon = ft.icons.CLOSE
            model_load_unload_button.current.disabled = False

            record_button.current.disabled = False

            if mm.is_model_loaded():
                current_mode_select.current.disabled = True
        else:
            for btn in transcribe_buttons:
                btn.current.disabled = True
            model_size_select.current.disabled = False
            model_device_select.current.disabled = False
            # model_bits_select.current.disabled = False
            model_load_unload_button.current.disabled = False
            model_load_unload_button.current.icon = ft.icons.START
            model_load_unload_button.current.on_click = lambda _: load_model()
            processing_spinner.current.visible = False
            current_mode_select.current.disabled = False

            record_button.current.disabled = True

        page.update()

    def on_url_input(e):
        url_value = whisper_webservice_url_input.current.value
        # print(url_value)

        if validators.url(url_value, simple_host=True):
            # print('valid')
            page.client_storage.set('webservice_url', url_value)
            # set all transcribe buttons to enabled
            set_transcribe_ready(True)
        else:
            # print('invalid')
            # set all transcribe buttons to disabled
            set_transcribe_ready(False)

        page.update()

    print(tuple(page.client_storage.get('selected_mic')))

    def toggle_recording():
        global recording
        global rec_stream
        global sound_chunks
        global recorded_audio

        if recording:
            print("Stopping recording...")

            rec_stream.stop_stream()

            while not rec_stream.is_stopped():
                pass  # wait until stopped

            recorded_audio = b"".join(sound_chunks)

            set_transcribe_ready(False)

            transcribe(recorded_audio)

            recording = False

            # sound = pygame.mixer.Sound(buffer=recorded_audio)  # doesn't work because sampling rate is wrong
            record_button.current.bgcolor = "0x000000FF"

            set_transcribe_ready(True)

            print("done")
            # sound.play()
        else:
            if not transcribe_ready:
                print("Can't record, not ready")
                return
            print("Starting Recording...")
            recording = True

            sound_chunks = []

            def cb(in_data, _frame_count, _time_info, _status):
                sound_chunks.append(in_data)
                print(_time_info)
                return in_data, pyaudio.paContinue

            rec_stream = p.open(
                format=REC_FORMAT,
                channels=REC_CHANNELS,
                rate=REC_RATE,
                input=True,
                frames_per_buffer=REC_CHUNK,
                stream_callback=cb
            )

            rec_stream.start_stream()

            record_button.current.bgcolor = "0xFFFF4444"
            paralyze_ui(spinner=False, disable_recording_button=False)

    def find_recordingdevice_tuple_by_name(search_name: str) -> typing.Tuple[int, str] | None:
        return next(((device_id, name) for device_id, name in capture_devices if name == search_name))

    # set up file picker
    file_picker = ft.FilePicker(on_result=on_dialog_result)

    page.overlay.append(file_picker)

    page.add(
        ft.Text("Flüsterpost", style=ft.TextThemeStyle.TITLE_LARGE),
        ft.Divider()
    )

    mode = page.client_storage.get('selected_mode') if page.client_storage.contains_key('selected_mode') else 'local'

    # last opened folders


    # build controls list
    last_opened_folders = page.client_storage.get('last_opened_folders') if page.client_storage.contains_key(
        'last_opened_folders') else []

    if not (isinstance(last_opened_folders, list) and all(isinstance(item, str) for item in last_opened_folders)):
        last_opened_folders = []
        
    # TODO: rebuild when last_opened_folders changes
    last_opened = [
        ft.PopupMenuItem(
            on_click=lambda _, folder_name=folder_name: on_dialog_result( folder_name ),
            content=ft.Row([
                ft.Icon(ft.icons.FOLDER, color=ft.colors.BLUE),
                ft.Text(folder_name, size=14, weight=ft.FontWeight.BOLD),
            ])
        )
        for folder_name in last_opened_folders
    ]
    

    page.add(
        ft.ResponsiveRow([
            ft.Container(
                ft.Column([
                    ft.Row([
                        ft.ElevatedButton("Add Folder", on_click=lambda _: file_picker.get_directory_path()),
                        ft.PopupMenuButton(
                            items=last_opened,
                        ),
                        ft.Container(expand=True),
                        ft.IconButton(ft.icons.RECORD_VOICE_OVER, ref=record_button,
                                      on_click=lambda _: toggle_recording()),
                    ]),
                    ft.Dropdown(
                        ref=mic_select,
                        options=[ft.dropdown.Option(x[1]) for x in capture_devices],
                        value=page.client_storage.get('selected_mic')[1] if (
                                page.client_storage.contains_key('selected_mic') and tuple(
                            page.client_storage.get('selected_mic')) in capture_devices) else capture_devices[0][1],
                        height=36,
                        content_padding=2,
                        on_change=lambda _: page.client_storage.set('selected_mic', find_recordingdevice_tuple_by_name(
                            mic_select.current.value)) if mic_select.current.value else None
                    ),
                    ft.Column(ref=file_tree, scroll=ft.ScrollMode.ALWAYS, expand=True),
                    # ft.ListView(ref=file_tree),
                    ft.Text("No Folder Open Yet", style=ft.TextTheme.body_small, color="grey",
                            ref=file_tree_empty_text),
                ], expand=True), expand=True, col=4),
            ft.Container(expand=True, content=ft.Column(expand=True, controls=[
                ft.Column([
                    ft.Text(
                        'Select parameters, and then load transcription model.'
                        if mode == 'local'
                        else 'Input the URL of the onerahmet/openai-whisper-asr-webservice docker container'
                        , ref=current_mode_info_text),
                    ft.Row([
                        ft.Dropdown(
                            ref=current_mode_select,
                            width=160,
                            hint_text='mode',
                            value=mode,
                            on_change=lambda _: mode_select(),
                            options=[
                                ft.dropdown.Option('local'),
                                ft.dropdown.Option('webservice'),
                            ],
                        ),

                        # === LOCAL MODE ===
                        ft.Dropdown(
                            ref=model_size_select,
                            width=100,
                            hint_text='model size',
                            value=page.client_storage.get('model_size') if page.client_storage.contains_key(
                                'model_size') else 'base',
                            options=[ft.dropdown.Option(x) for x in mm.ModelSize.__args__],
                            # __args__ is not perfect here. But works.
                            visible=mode == 'local',
                        ),
                        ft.Dropdown(
                            ref=model_device_select,
                            width=100,
                            hint_text='device',
                            value=page.client_storage.get('device_select') if page.client_storage.contains_key(
                                'device_select') else 'auto',
                            options=[ft.dropdown.Option(x) for x in mm.Device.__args__],
                            visible=mode == 'local',
                            # __args__ is not perfect here. But works.
                        ),
                        # ft.Dropdown(
                        #    ref=model_bits_select,
                        #    width=100,
                        #    hint_text='bits',
                        #    value='16bit',
                        #    options=[ft.dropdown.Option(x) for x in mm.ComputeType.__args__]  # __args__ is not perfect here. But works.
                        # ),
                        ft.IconButton(
                            icon=ft.icons.START,
                            ref=model_load_unload_button,
                            on_click=lambda _: load_model(),
                            visible=mode == 'local',
                        ),
                        # === WEBSERVICE MODE ===
                        ft.TextField(
                            ref=whisper_webservice_url_input,
                            visible=mode == 'webservice',
                            on_change=on_url_input,
                            hint_text='e.g. http://localhost:9000',
                            value=page.client_storage.get('webservice_url') if page.client_storage.contains_key(
                                'webservice_url') else '',
                        ),
                        # TODO: question mark hint button about what the web service is

                        # === GENERAL ===
                        ft.ProgressRing(ref=processing_spinner, visible=False)
                    ])
                ]),
                ft.Container(expand=True, padding=12, border=ft.border.all(2, 'grey'),
                             alignment=ft.alignment.center,
                             ref=output_text_container,
                             content=ft.Column(
                                 [ft.Text('Nothing to see here!', text_align=ft.TextAlign.CENTER)],
                                 ref=output_text_col,
                                 expand=True,
                                 scroll=ft.ScrollMode.ADAPTIVE)),
            ]), col=8)
        ], expand=True),
    )

    # refresh all values, and make sure the right stuff is shown
    mode_select()


ft.app(target=main)