import os
import textwrap
import scipy
import ffmpeg
import numpy as np


def clear_screen():
    """Clears the console screen."""
    os.system("cls" if os.name == "nt" else "clear")


def print_transcript(text):
    """Prints formatted transcript text."""
    wrapper = textwrap.TextWrapper(width=60)
    for line in wrapper.wrap(text="".join(text)):
        print(line)


def format_time(s):
    """Convert seconds (float) to SRT time format."""
    hours = int(s // 3600)
    minutes = int((s % 3600) // 60)
    seconds = int(s % 60)
    milliseconds = int((s - int(s)) * 1000)
    return f"{hours:02}:{minutes:02}:{seconds:02},{milliseconds:03}"


def create_srt_file(segments, output_file):
    with open(output_file, 'w', encoding='utf-8') as srt_file:
        segment_number = 1
        for segment in segments:
            start_time = format_time(float(segment['start']))
            end_time = format_time(float(segment['end']))
            text = segment['text']

            srt_file.write(f"{segment_number}\n")
            srt_file.write(f"{start_time} --> {end_time}\n")
            srt_file.write(f"{text}\n\n")

            segment_number += 1


def resample(file: str, sr: int = 16000):
    """
    # https://github.com/openai/whisper/blob/7858aa9c08d98f75575035ecd6481f462d66ca27/whisper/audio.py#L22
    Open an audio file and read as mono waveform, resampling as necessary,
    save the resampled audio

    Args:
        file (str): The audio file to open
        sr (int): The sample rate to resample the audio if necessary

    Returns:
        resampled_file (str): The resampled audio file
    """
    try:
        # This launches a subprocess to decode audio while down-mixing and resampling as necessary.
        # Requires the ffmpeg CLI and `ffmpeg-python` package to be installed.
        out, _ = (
            ffmpeg.input(file, threads=0)
            .output("-", format="s16le", acodec="pcm_s16le", ac=1, ar=sr)
            .run(cmd=["ffmpeg", "-nostdin"], capture_stdout=True, capture_stderr=True)
        )
    except ffmpeg.Error as e:
        raise RuntimeError(f"Failed to load audio: {e.stderr.decode()}") from e
    np_buffer = np.frombuffer(out, dtype=np.int16)

    resampled_file = f"{file.split('.')[0]}_resampled.wav"
    scipy.io.wavfile.write(resampled_file, sr, np_buffer.astype(np.int16))
    return resampled_file