from __future__ import annotations
import os
#download for mecab
os.system('python -m unidic download')

# we need to compile a CUBLAS version 
# Or get it from  https://jllllll.github.io/llama-cpp-python-cuBLAS-wheels/
os.system('CMAKE_ARGS="-DLLAMA_CUBLAS=on" pip install llama-cpp-python==0.2.11')

# By using XTTS you agree to CPML license https://coqui.ai/cpml
os.environ["COQUI_TOS_AGREED"] = "1"

# NOTE: for streaming will require gradio audio streaming fix
# pip install --upgrade -y gradio==0.50.2 git+https://github.com/gorkemgoknar/gradio.git@patch-1

import textwrap
from scipy.io.wavfile import write
from pydub import AudioSegment
import gradio as gr
import numpy as np
import torch
import nltk  # we'll use this to split into sentences
nltk.download("punkt")

import noisereduce as nr
import subprocess
import langid
import uuid
import emoji
import pathlib

import datetime

from scipy.io.wavfile import write
from pydub import AudioSegment

import re
import io, wave
import librosa
import torchaudio
from TTS.api import TTS
from TTS.tts.configs.xtts_config import XttsConfig
from TTS.tts.models.xtts import Xtts
from TTS.utils.generic_utils import get_user_data_dir


import gradio as gr
import os
import time

import gradio as gr
from transformers import pipeline
import numpy as np

from gradio_client import Client
from huggingface_hub import InferenceClient

# This will trigger downloading model
print("Downloading if not downloaded Coqui XTTS V2")

from TTS.utils.manage import ModelManager
model_name = "tts_models/multilingual/multi-dataset/xtts_v2"
ModelManager().download_model(model_name)
model_path = os.path.join(get_user_data_dir("tts"), model_name.replace("/", "--"))
print("XTTS downloaded")


print("Loading XTTS")
config = XttsConfig()
config.load_json(os.path.join(model_path, "config.json"))

model = Xtts.init_from_config(config)
model.load_checkpoint(
    config,
    checkpoint_path=os.path.join(model_path, "model.pth"),
    vocab_path=os.path.join(model_path, "vocab.json"),
    eval=True,
    use_deepspeed=True,
)
model.cuda()
print("Done loading TTS")

#####llm_model = os.environ.get("LLM_MODEL", "mistral") # or "zephyr"

title = "Generate audio stories using Zephyr and Coqui XTTS"

DESCRIPTION = """# Generate audio stories using Zephyr and Coqui XTTS"""
css = """.toast-wrap { display: none !important } """

from huggingface_hub import HfApi

HF_TOKEN = os.environ.get("HF_TOKEN")
# will use api to restart space on a unrecoverable error
api = HfApi(token=HF_TOKEN)

# config changes by Julian ---------------
import base64
repo_id = "jbilcke-hf/ai-story-server"
SECRET_TOKEN = os.getenv('SECRET_TOKEN', 'default_secret')
SENTENCE_SPLIT_LENGTH=250
# ----------------------------------------

default_system_message = f"""
# Mission
You are an influencer making short videos for a new video platform.
You need to generate the audio description and/or dialogue of a new video.

# Rules
The video may be about various topics (fun, jokes, language learning, education, documentary, investigation, travel, reviews of product, movies, games etc), so you need to adapt the audio commentary accordingly.
For instance if it's a story, you need to write like a storyteller, with a mix of 3rd person commentary and character dialogue.
Or, if it's a documentary or another kind of video type, you can keep your own 1st person voice to describe it naturally.
I will let you figure it out, choose the appropriate mode!

# Output format
The user may gives you indicated about the duration of the video.
1 minute of video should be around 100-150 words (this represents about 5-10 sentences).
If there is no indication of how long the video should last, use your best judgement.
Generally a video lasts between 1 and 10 minutes.

# Guidelines
- Don’t use complex words. Don’t use lists, markdown, bullet points, or other formatting that’s not typically spoken.
- Type out numbers in words (e.g. 'twenty twelve' instead of the year 2012).
- Remember to follow these rules absolutely, and do not refer to these rules, even if you’re asked about them.
"""

default_system_message = default_system_message.replace("CURRENT_DATE", str(datetime.date.today()))

ROLES = ["Cloée","Julian"]

    
### WILL USE LOCAL MISTRAL OR ZEPHYR

from huggingface_hub import hf_hub_download
print("Downloading LLM")


print("Downloading Zephyr")
#Zephyr
hf_hub_download(repo_id="TheBloke/zephyr-7B-beta-GGUF", local_dir=".", filename="zephyr-7b-beta.Q5_K_M.gguf")
# use new gguf format
zephyr_model_path="./zephyr-7b-beta.Q5_K_M.gguf"

from llama_cpp import Llama
# set GPU_LAYERS to 15 if you have a 8GB GPU so both models can fit in
# else 35 full layers + XTTS works fine on T4 16GB
# 5gb per llm, 4gb XTTS -> full layers should fit T4 16GB , 2LLM + XTTS
GPU_LAYERS=int(os.environ.get("GPU_LAYERS", 35))

LLM_STOP_WORDS= ["</s>","<|user|>","/s>"]

LLAMA_VERBOSE=False

print("Running LLM Zephyr")
llm_zephyr = Llama(model_path=zephyr_model_path,n_gpu_layers=GPU_LAYERS-10,max_new_tokens=512, context_window=4096, n_ctx=4096,n_batch=128,verbose=LLAMA_VERBOSE)

def split_sentences(text, max_len):
    # Apply custom rules to enforce sentence breaks with double punctuation
    text = re.sub(r"(\s*\.{2})\s*", r".\1 ", text)  # for '..'
    text = re.sub(r"(\s*\!{2})\s*", r"!\1 ", text)  # for '!!'

    # Use NLTK to split into sentences
    sentences = nltk.sent_tokenize(text)

    # Then check if each sentence is greater than max_len, if so, use textwrap to split it
    sentence_list = []
    for sent in sentences:
        if len(sent) > max_len:
            wrapped = textwrap.wrap(sent, max_len, break_long_words=True)
            sentence_list.extend(wrapped)
        else:
            sentence_list.append(sent)
    
    return sentence_list


# <|system|>
# You are a friendly chatbot who always responds in the style of a pirate.</s>
# <|user|>
# How many helicopters can a human eat in one sitting?</s>
# <|assistant|>
# Ah, me hearty matey! But yer question be a puzzler! A human cannot eat a helicopter in one sitting, as helicopters are not edible. They be made of metal, plastic, and other materials, not food!

# Zephyr formatter
def format_prompt_zephyr(message, history, system_message):
    prompt = (
        "<|system|>\n" + system_message  + "</s>"
    )
    for user_prompt, bot_response in history:
        prompt += f"<|user|>\n{user_prompt}</s>"
        prompt += f"<|assistant|>\n{bot_response}</s>"
    if message=="":
        message="Hello"
    prompt += f"<|user|>\n{message}</s>"
    prompt += f"<|assistant|>"
    print(prompt)
    return prompt

import struct

# Generated by GPT-4
def pcm_to_wav(pcm_data, sample_rate=24000, channels=1, bit_depth=16):
    # Check if the input data is already in the WAV format
    if pcm_data.startswith(b"RIFF"):
        return pcm_data

    # Calculate subchunk sizes
    fmt_subchunk_size = 16 # for PCM
    data_subchunk_size = len(pcm_data)
    chunk_size = 4 + (8 + fmt_subchunk_size) + (8 + data_subchunk_size)

    # Prepare the WAV file headers
    wav_header = struct.pack('<4sI4s', b'RIFF', chunk_size, b'WAVE')  # 'RIFF' chunk descriptor
    fmt_subchunk = struct.pack('<4sIHHIIHH', 
                               b'fmt ', fmt_subchunk_size, 1, channels,
                               sample_rate, sample_rate * channels * bit_depth // 8,
                               channels * bit_depth // 8, bit_depth)

    data_subchunk = struct.pack('<4sI', b'data', data_subchunk_size)

    return wav_header + fmt_subchunk + data_subchunk + pcm_data

def generate_local(
    prompt,    
    history,
    system_message,
    temperature=0.8,
    max_tokens=256,
    top_p=0.95,
    stop = LLM_STOP_WORDS
):
    temperature = float(temperature)
    if temperature < 1e-2:
        temperature = 1e-2
    top_p = float(top_p)

    generate_kwargs = dict(
        temperature=temperature,
        max_tokens=max_tokens,
        top_p=top_p,
        stop=stop
    )

    sys_mess = system_message.replace("##LLM_MODEL###","Zephyr").replace("##LLM_MODEL_PROVIDER###","Hugging Face")
    formatted_prompt = format_prompt_zephyr(prompt, history, sys_mess)
    llm = llm_zephyr


    try:
        print("LLM Input:", formatted_prompt)
        stream = llm(
            formatted_prompt,
            **generate_kwargs,
            stream=True,
        )
        output = ""
        for response in stream:
            character= response["choices"][0]["text"]

            if "<|user|>" in character:
                # end of context
                return 
                
            if emoji.is_emoji(character):
                # Bad emoji not a meaning messes chat from next lines
                return
                
            
            output += response["choices"][0]["text"].replace("<|assistant|>","").replace("<|user|>","")
            yield output

    except Exception as e:
        if "Too Many Requests" in str(e):
            print("ERROR: Too many requests on mistral client")
            gr.Warning("Unfortunately Mistral is unable to process")
            output = "Unfortunately I am not able to process your request now !"
        else:
            print("Unhandled Exception: ", str(e))
            gr.Warning("Unfortunately Mistral is unable to process")
            output = "I do not know what happened but I could not understand you ."

    return output

def get_latents(speaker_wav,voice_cleanup=False):
    if (voice_cleanup):
        try:
            cleanup_filter="lowpass=8000,highpass=75,areverse,silenceremove=start_periods=1:start_silence=0:start_threshold=0.02,areverse,silenceremove=start_periods=1:start_silence=0:start_threshold=0.02" 
            resample_filter="-ac 1 -ar 22050"
            out_filename = speaker_wav + str(uuid.uuid4()) + ".wav"  #ffmpeg to know output format
            #we will use newer ffmpeg as that has afftn denoise filter
            shell_command = f"ffmpeg -y -i {speaker_wav} -af {cleanup_filter} {resample_filter} {out_filename}".split(" ")

            command_result = subprocess.run([item for item in shell_command], capture_output=False,text=True, check=True)
            speaker_wav=out_filename
            print("Filtered microphone input")
        except subprocess.CalledProcessError:
            # There was an error - command exited with non-zero code
            print("Error: failed filtering, use original microphone input")
    else:
            speaker_wav=speaker_wav
            
    # create as function as we can populate here with voice cleanup/filtering
    (
        gpt_cond_latent,
        speaker_embedding,
    ) = model.get_conditioning_latents(audio_path=speaker_wav)
    return gpt_cond_latent, speaker_embedding

def wave_header_chunk(frame_input=b"", channels=1, sample_width=2, sample_rate=24000):
    # This will create a wave header then append the frame input
    # It should be first on a streaming wav file
    # Other frames better should not have it (else you will hear some artifacts each chunk start)
    wav_buf = io.BytesIO()
    with wave.open(wav_buf, "wb") as vfout:
        vfout.setnchannels(channels)
        vfout.setsampwidth(sample_width)
        vfout.setframerate(sample_rate)
        vfout.writeframes(frame_input)

    wav_buf.seek(0)
    return wav_buf.read()


#Config will have more correct languages, they may be added before we append here
##["en","es","fr","de","it","pt","pl","tr","ru","nl","cs","ar","zh-cn","ja"]

xtts_supported_languages=config.languages  
def detect_language(prompt):
    # Fast language autodetection
    if len(prompt)>15:
        language_predicted=langid.classify(prompt)[0].strip() # strip need as there is space at end!
        if language_predicted == "zh": 
            #we use zh-cn on xtts
            language_predicted = "zh-cn"
            
        if language_predicted not in xtts_supported_languages:
            print(f"Detected a language not supported by xtts :{language_predicted}, switching to english for now")
            gr.Warning(f"Language detected '{language_predicted}' can not be spoken properly 'yet' ")
            language= "en"
        else:
            language = language_predicted
        print(f"Language: Predicted sentence language:{language_predicted} , using language for xtts:{language}")
    else:
        # Hard to detect language fast in short sentence, use english default
        language = "en"
        print(f"Language: Prompt is short or autodetect language disabled using english for xtts")

    return language
    
def get_voice_streaming(prompt, language, latent_tuple, suffix="0"):
    gpt_cond_latent, speaker_embedding = latent_tuple

    try:
        t0 = time.time()
        chunks = model.inference_stream(
            prompt,
            language,
            gpt_cond_latent,
            speaker_embedding,
            #repetition_penalty=5.0,
            temperature=0.85,
        )

        first_chunk = True
        for i, chunk in enumerate(chunks):
            if first_chunk:
                first_chunk_time = time.time() - t0
                metrics_text = f"Latency to first audio chunk: {round(first_chunk_time*1000)} milliseconds\n"
                first_chunk = False
            #print(f"Received chunk {i} of audio length {chunk.shape[-1]}")

            # directly return chunk as bytes for streaming
            chunk = chunk.detach().cpu().numpy().squeeze()
            chunk = (chunk * 32767).astype(np.int16)

            yield chunk.tobytes()

    except RuntimeError as e:
        if "device-side assert" in str(e):
            # cannot do anything on cuda device side error, need tor estart
            print(
                f"Exit due to: Unrecoverable exception caused by prompt:{prompt}",
                flush=True,
            )
            gr.Warning("Unhandled Exception encounter, please retry in a minute")
            print("Cuda device-assert Runtime encountered need restart")

            # HF Space specific.. This error is unrecoverable need to restart space
            api.restart_space(repo_id=repo_id)
        else:
            print("RuntimeError: non device-side assert error:", str(e))
            # Does not require warning happens on empty chunk and at end
            ###gr.Warning("Unhandled Exception encounter, please retry in a minute")
            return None
        return None
    except:
        return None

    
# Will be triggered on text submit (will send to generate_speech)
def add_text(history, text):
    history = [] if history is None else history
    history = history + [(text, None)]
    return history, gr.update(value="", interactive=False)

# Will be triggered on voice submit (will transribe and send to generate_speech)
def add_file(history, file):
    history = [] if history is None else history

    try:
        text = transcribe(file)
        print("Transcribed text:", text)
    except Exception as e:
        print(str(e))
        gr.Warning("There was an issue with transcription, please try writing for now")
        # Apply a null text on error
        text = "Transcription seems failed, please tell me a joke about chickens"

    history = history + [(text, None)]
    return history, gr.update(value="", interactive=False)


def get_sentence(system_prompt, history, chatbot_role):
    
    history = [["", None]] if history is None else history

    history[-1][1] = ""

    sentence_list = []
    sentence_hash_list = []

    text_to_generate = ""
    stored_sentence = None
    stored_sentence_hash = None

    print(chatbot_role)

    # try to use the user-provided system prompt, other use the default system prompt
    system_message = system_prompt if system_prompt else default_system_message
    
    for character in generate_local(history[-1][0], history[:-1], system_message):
        history[-1][1] = character.replace("<|assistant|>","")
        # It is coming word by word

        text_to_generate = nltk.sent_tokenize(history[-1][1].replace("\n", " ").replace("<|assistant|>"," ").replace("<|ass>","").replace("[/ASST]","").replace("[/ASSI]","").replace("[/ASS]","").replace("","").strip())
        if len(text_to_generate) > 1:
            
            dif = len(text_to_generate) - len(sentence_list)

            if dif == 1 and len(sentence_list) != 0:
                continue

            if dif == 2 and len(sentence_list) != 0 and stored_sentence is not None:
                continue

            # All this complexity due to trying append first short sentence to next one for proper language auto-detect
            if stored_sentence is not None and stored_sentence_hash is None and dif>1:
                #means we consumed stored sentence and should look at next sentence to generate
                sentence = text_to_generate[len(sentence_list)+1]
            elif stored_sentence is not None and len(text_to_generate)>2 and stored_sentence_hash is not None:
                print("Appending stored")
                sentence = stored_sentence + text_to_generate[len(sentence_list)+1]
                stored_sentence_hash = None
            else:
                sentence = text_to_generate[len(sentence_list)]
                
            # too short sentence just append to next one if there is any
            # this is for proper language detection 
            if len(sentence)<=15 and stored_sentence_hash is None and stored_sentence is None:
                if sentence[-1] in [".","!","?"]:
                    if stored_sentence_hash != hash(sentence):
                        stored_sentence = sentence
                        stored_sentence_hash = hash(sentence) 
                        print("Storing:",stored_sentence)
                        continue
            
            
            sentence_hash = hash(sentence)
            if stored_sentence_hash is not None and sentence_hash == stored_sentence_hash:
                continue
            
            if sentence_hash not in sentence_hash_list:
                sentence_hash_list.append(sentence_hash)
                sentence_list.append(sentence)
                print("New Sentence: ", sentence)
                yield (sentence, history)

    # return that final sentence token
    try:
        last_sentence = nltk.sent_tokenize(history[-1][1].replace("\n", " ").replace("<|ass>","").replace("[/ASST]","").replace("[/ASSI]","").replace("[/ASS]","").replace("","").strip())[-1]
        sentence_hash = hash(last_sentence)
        if sentence_hash not in sentence_hash_list:
            if stored_sentence is not None and stored_sentence_hash is not None:
                last_sentence = stored_sentence + last_sentence
                stored_sentence = stored_sentence_hash = None
                print("Last Sentence with stored:",last_sentence)
        
            sentence_hash_list.append(sentence_hash)
            sentence_list.append(last_sentence)
            print("Last Sentence: ", last_sentence)
    
            yield (last_sentence, history)
    except:
        print("ERROR on last sentence history is :", history)


from scipy.io.wavfile import write
from pydub import AudioSegment

second_of_silence = AudioSegment.silent() # use default
second_of_silence.export("sil.wav", format='wav')

 
def generate_speech_from_history(history, chatbot_role, sentence):
    language = "autodetect"

    # total_wav_bytestream = b""
    
    if len(sentence)==0:
        print("EMPTY SENTENCE")
        return 
    
    # Sometimes prompt </s> coming on output remove it
    # Some post process for speech only
    sentence = sentence.replace("</s>", "")
    # remove code from speech
    sentence = re.sub("```.*```", "", sentence, flags=re.DOTALL)
    sentence = re.sub("`.*`", "", sentence, flags=re.DOTALL)
    
    sentence = re.sub("\(.*\)", "", sentence, flags=re.DOTALL)
    
    sentence = sentence.replace("```", "")
    sentence = sentence.replace("...", " ")
    sentence = sentence.replace("(", " ")
    sentence = sentence.replace(")", " ")
    sentence = sentence.replace("<|assistant|>","")

    if len(sentence)==0:
        print("EMPTY SENTENCE after processing")
        return 
        
    # A fast fix for last character, may produce weird sounds if it is with text
    #if (sentence[-1] in ["!", "?", ".", ","]) or (sentence[-2] in ["!", "?", ".", ","]):
    #    # just add a space
    #    sentence = sentence[:-1] + " " + sentence[-1]
        
    # regex does the job well
    sentence = re.sub("([^\x00-\x7F]|\w)([\.。?!]+)",r"\1 \2",sentence)
    
    print("Sentence for speech:", sentence)

    results = []
    
    try:
        if len(sentence) < SENTENCE_SPLIT_LENGTH:
            # no problem continue on
            sentence_list = [sentence]
        else:
            # Until now nltk likely split sentences properly but we need additional 
            # check for longer sentence and split at last possible position
            # Do whatever necessary, first break at hypens then spaces and then even split very long words
            # sentence_list=textwrap.wrap(sentence,SENTENCE_SPLIT_LENGTH)
            sentence_list = split_sentences(sentence, SENTENCE_SPLIT_LENGTH)
        
        print("detected sentences:", sentence_list)
        
        for sentence in sentence_list:
            
            print("- sentence = ", sentence)
        
            if any(c.isalnum() for c in sentence):
                if language=="autodetect":
                    #on first call autodetect, nexts sentence calls will use same language
                    language = detect_language(sentence) 
            
                #exists at least 1 alphanumeric (utf-8) 
                audio_stream = get_voice_streaming(
                        sentence, language, latent_map[chatbot_role]
                    )
            else:
                # likely got a ' or " or some other text without alphanumeric in it
                audio_stream = None
                continue

            # XTTS is actually using streaming response but we are playing audio by sentence
            # If you want direct XTTS voice streaming (send each chunk to voice ) you may set DIRECT_STREAM=1 environment variable
            if audio_stream is not None:
                sentence_wav_bytestream = b""
                
                # frame_length = 0
                for chunk in audio_stream:
                    try:
                        if chunk is not None:
                            sentence_wav_bytestream += chunk
                        # frame_length += len(chunk)
                    except:
                        # hack to continue on playing. sometimes last chunk is empty , will be fixed on next TTS
                        continue

                # Filter output for better voice
                filter_output=True 
                if filter_output:
                    try:
                        data_s16 = np.frombuffer(sentence_wav_bytestream, dtype=np.int16, count=len(sentence_wav_bytestream)//2, offset=0)
                        float_data = data_s16 * 0.5**15
                        reduced_noise = nr.reduce_noise(y=float_data, sr=24000,prop_decrease =0.8,n_fft=1024)
                        sentence_wav_bytestream = (reduced_noise * 32767).astype(np.int16)
                        sentence_wav_bytestream = sentence_wav_bytestream.tobytes()
                    except:
                        print("failed to remove noise")
    
                # Directly encode the WAV bytestream to base64
                base64_audio = base64.b64encode(pcm_to_wav(sentence_wav_bytestream)).decode('utf8')

                results.append({ "text": sentence, "audio": base64_audio })
            else:
                # Handle the case where the audio stream is None (e.g., silent response)
                results.append({ "text": sentence, "audio": "" })

    except RuntimeError as e:
        if "device-side assert" in str(e):
            # cannot do anything on cuda device side error, need tor estart
            print(
                f"Exit due to: Unrecoverable exception caused by prompt:{sentence}",
                flush=True,
            )
            gr.Warning("Unhandled Exception encounter, please retry in a minute")
            print("Cuda device-assert Runtime encountered need restart")

            # HF Space specific.. This error is unrecoverable need to restart space
            api.restart_space(repo_id=repo_id)
        else:
            print("RuntimeError: non device-side assert error:", str(e))
            raise e

    return results

latent_map = {}
latent_map["Cloée"] = get_latents("voices/cloee-1.wav")
latent_map["Julian"] = get_latents("voices/julian-bedtime-style-1.wav")
latent_map["Pirate"] = get_latents("voices/pirate_by_coqui.wav")
latent_map["Thera"] = get_latents("voices/thera-1.wav")

# Define the main function for the API endpoint that takes the input text and chatbot role
def generate_story_and_speech(secret_token, system_prompt, input_text, chatbot_role):
    if secret_token != SECRET_TOKEN:
        raise gr.Error(
            f'Invalid secret token. Please fork the original space if you want to use it for yourself.')
        
    # Initialize a list of lists for history with the user input as the first entry
    history = [[input_text, None]]
    story_sentences = get_sentence(system_prompt, history, chatbot_role)  # get_sentence function generates text

    story_text = ""  # Initialize variable to hold the full story text
    last_history = None  # To store the last history after all sentences

    # Iterate over the sentences generated by get_sentence and concatenate them
    for sentence, updated_history in story_sentences:
        if sentence:
            story_text += sentence.strip() + " "  # Add each sentence to the story_text
            last_history = updated_history  # Keep track of the last history update

    if last_history is not None:
        # Convert the list of lists back into a list of tuples for the history
        history_tuples = [tuple(entry) for entry in last_history]

        return generate_speech_from_history(history_tuples, chatbot_role, story_text) 

    else:
        return []

# Create a Gradio Interface using only the `generate_story_and_speech()` function and the 'json' output type
demo = gr.Interface(
    fn=generate_story_and_speech,
    inputs=[
        gr.Text(label='Secret Token'),
        gr.Textbox(placeholder="Enter your system prompt here"),
        gr.Textbox(placeholder="Enter your text here"),
        gr.Dropdown(choices=ROLES,label="Select Chatbot Role")
    ],
    outputs="json"
)

demo.queue()
demo.launch(debug=True)