"""The main tabbyAPI module. Contains the FastAPI server and endpoints."""

import asyncio
import os
import pathlib
import signal
from loguru import logger
from typing import Optional

from backends.exllamav2.utils import check_exllama_version
from common import config, gen_logging, sampling, model
from common.args import convert_args_to_dict, init_argparser
from common.auth import load_auth_keys
from common.logger import setup_logger
from common.networking import is_port_in_use
from common.signals import signal_handler
from common.utils import unwrap
from endpoints.server import start_api


async def entrypoint(args: Optional[dict] = None):
    """Entry function for program startup"""

    setup_logger()

    # Set up signal aborting
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    # Load from YAML config
    config.from_file(pathlib.Path("config.yml"))

    # Parse and override config from args
    if args is None:
        parser = init_argparser()
        args = convert_args_to_dict(parser.parse_args(), parser)

    config.from_args(args)

    developer_config = config.developer_config()

    # Check exllamav2 version and give a descriptive error if it's too old
    # Skip if launching unsafely

    if unwrap(developer_config.get("unsafe_launch"), False):
        logger.warning(
            "UNSAFE: Skipping ExllamaV2 version check.\n"
            "If you aren't a developer, please keep this off!"
        )
    else:
        check_exllama_version()

    # Enable CUDA malloc backend
    if unwrap(developer_config.get("cuda_malloc_backend"), False):
        os.environ["PYTORCH_CUDA_ALLOC_CONF"] = "backend:cudaMallocAsync"
        logger.warning("Enabled the experimental CUDA malloc backend.")

    network_config = config.network_config()

    host = unwrap(network_config.get("host"), "127.0.0.1")
    port = unwrap(network_config.get("port"), 5000)

    # Check if the port is available and attempt to bind a fallback
    if is_port_in_use(port):
        fallback_port = port + 1

        if is_port_in_use(fallback_port):
            logger.error(
                f"Ports {port} and {fallback_port} are in use by different services.\n"
                "Please free up those ports or specify a different one.\n"
                "Exiting."
            )

            return
        else:
            logger.warning(
                f"Port {port} is currently in use. Switching to {fallback_port}."
            )

            port = fallback_port

    # Initialize auth keys
    load_auth_keys(unwrap(network_config.get("disable_auth"), False))

    # Override the generation log options if given
    log_config = config.gen_logging_config()
    if log_config:
        gen_logging.update_from_dict(log_config)

    gen_logging.broadcast_status()

    # Set sampler parameter overrides if provided
    sampling_config = config.sampling_config()
    sampling_override_preset = sampling_config.get("override_preset")
    if sampling_override_preset:
        try:
            sampling.overrides_from_file(sampling_override_preset)
        except FileNotFoundError as e:
            logger.warning(str(e))

    # If an initial model name is specified, create a container
    # and load the model
    model_config = config.model_config()
    model_name = model_config.get("model_name")
    if model_name:
        model_path = pathlib.Path(unwrap(model_config.get("model_dir"), "models"))
        model_path = model_path / model_name

        await model.load_model(model_path.resolve(), **model_config)

        # Load loras after loading the model
        lora_config = config.lora_config()
        if lora_config.get("loras"):
            lora_dir = pathlib.Path(unwrap(lora_config.get("lora_dir"), "loras"))
            await model.container.load_loras(lora_dir.resolve(), **lora_config)

    await start_api(host, port)


if __name__ == "__main__":
    asyncio.run(entrypoint())