import os
from pathlib import Path
import requests
from tqdm import tqdm
import importlib.metadata as metadata
import json
from packaging import version

# Use this_dir in the downloader script
this_dir = Path(__file__).parent.resolve()

# Define the path to the JSON file
config_file_path = this_dir / 'modeldownload.json'

# Check if the JSON file exists
if config_file_path.exists():
    with open(config_file_path, 'r') as config_file:
        settings = json.load(config_file)

    # Extract settings from the loaded JSON
    base_path = Path(settings.get("base_path", ""))
    model_path = Path(settings.get("model_path", ""))
    files_to_download = settings.get("files_to_download", {})
else:
    # Default settings if the JSON file doesn't exist or is empty
    print("[CoquiTTS Startup] \033[91mWarning\033[0m modeldownload.json is missing so please re-download it and save it in the coquii_tts main folder.")
    print("[CoquiTTS Startup] \033[91mWarning\033[0m API Local and XTTSv2 Local will error unless this is corrected.")

# Read the version specifier from requirements.txt
with open(this_dir / 'requirements.txt', 'r') as req_file:
    requirements = req_file.readlines()

tts_version_required = None
for req in requirements:
    if req.startswith('TTS=='):
        tts_version_required = req.strip().split('==')[1]
        break

if tts_version_required is None:
    raise ValueError("[CoquiTTS Startup] \033[91mWarning\033[0m Could not find TTS version specifier in requirements.txt")

def create_directory_if_not_exists(directory):
    if not directory.exists():
        directory.mkdir(parents=True)

def download_file(url, destination):
    response = requests.get(url, stream=True)
    total_size_in_bytes = int(response.headers.get('content-length', 0))
    block_size = 1024  # 1 Kibibyte

    progress_bar = tqdm(total=total_size_in_bytes, unit='iB', unit_scale=True)
    
    with open(destination, 'wb') as file:
        for data in response.iter_content(block_size):
            progress_bar.update(len(data))
            file.write(data)

    progress_bar.close()

def check_tts_version():
    try:
        tts_version = metadata.version("tts")
        print(f"[CoquiTTS Startup] TTS version installed: \033[93m{tts_version}\033[0m")

        if version.parse(tts_version) < version.parse(tts_version_required):
            print(f"[CoquiTTS Startup] \033[91mWarning\033[0m TTS version is too old. Please upgrade to version \033[93m{tts_version_required}\033[0m or later.\033[0m")
            print("[CoquiTTS Startup] \033[91mWarning\033[0m At your terminal/command prompt \033[94mpip install --upgrade tts\033[0m")
        else:
            print("[CoquiTTS Startup] TTS version is up to date.")
    except metadata.PackageNotFoundError:
        print("[CoquiTTS Startup] \033[91mWarning\033[0m TTS is not installed.")

# Check and create directories
if str(base_path) == "models":
    create_directory_if_not_exists(this_dir / base_path / model_path)
else:
    create_directory_if_not_exists(base_path / model_path)
    print("[CoquiTTS Startup] \033[94mInfo\033[0m Custom path set in \033[93mmodeldownload.json\033[0m. Using the following settings:")
    print("[CoquiTTS Startup] \033[94mInfo\033[0m Base folder Path:\033[93m", base_path , "\033[0m")
    print("[CoquiTTS Startup] \033[94mInfo\033[0m Model folder Path:\033[93m", model_path , "\033[0m")
    print("[CoquiTTS Startup] \033[94mInfo\033[0m Full Path:\033[93m", base_path / model_path , "\033[0m")

# Download files if they don't exist
print("[CoquiTTS Startup] Checking Model is Downloaded.")
for filename, url in files_to_download.items():
    if str(base_path) == "models":
        destination = this_dir / base_path / model_path / filename
    else:
        destination = Path(base_path) / model_path / filename

    if not destination.exists():
        print(f"[CoquiTTS Startup] Downloading {filename}...")
        download_file(url, destination)

check_tts_version()