"""Utility to automatically upgrade and start the API"""

import argparse
import json
import os
import pathlib
import platform
import subprocess
import sys
from shutil import copyfile
import traceback

from common.args import convert_args_to_dict, init_argparser


start_options = {}


def get_user_choice(question: str, options_dict: dict):
    """
    Gets user input in a commandline script.

    Originally from: https://github.com/oobabooga/text-generation-webui/blob/main/one_click.py#L213
    """

    print()
    print(question)
    print()

    for key, value in options_dict.items():
        print(f"{key}) {value.get('pretty')}")

    print()

    choice = input("Input> ").upper()
    while choice not in options_dict.keys():
        print("Invalid choice. Please try again.")
        choice = input("Input> ").upper()

    return choice


def get_install_features(lib_name: str = None):
    """Fetches the appropriate requirements file depending on the GPU"""
    install_features = None
    possible_features = ["cu121", "cu118", "amd"]

    if not lib_name:
        # Ask the user for the GPU lib
        gpu_lib_choices = {
            "A": {"pretty": "NVIDIA Cuda 12.x", "internal": "cu121"},
            "B": {"pretty": "NVIDIA Cuda 11.8", "internal": "cu118"},
            "C": {"pretty": "AMD", "internal": "amd"},
        }
        user_input = get_user_choice(
            "Select your GPU. If you don't know, select Cuda 12.x (A)",
            gpu_lib_choices,
        )

        lib_name = gpu_lib_choices.get(user_input, {}).get("internal")

        # Write to start options
        start_options["gpu_lib"] = lib_name
        print("Saving your choice to start options.")

    # Assume default if the file is invalid
    if lib_name and lib_name in possible_features:
        print(f"Using {lib_name} dependencies from your preferences.")
        install_features = lib_name
    else:
        print(
            f"WARN: GPU library {lib_name} not found. "
            "Skipping GPU-specific dependencies.\n"
            "WARN: Please remove the `gpu_lib` key from start_options.json and restart "
            "if you want to change your selection."
        )
        return

    if install_features == "amd":
        # Exit if using AMD and Windows
        if platform.system() == "Windows":
            print(
                "ERROR: TabbyAPI does not support AMD and Windows. "
                "Please use Linux and ROCm 6.0. Exiting."
            )
            sys.exit(0)

        # Override env vars for ROCm support on non-supported GPUs
        os.environ["ROCM_PATH"] = "/opt/rocm"
        os.environ["HSA_OVERRIDE_GFX_VERSION"] = "10.3.0"
        os.environ["HCC_AMDGPU_TARGET"] = "gfx1030"

    return install_features


def add_start_args(parser: argparse.ArgumentParser):
    """Add start script args to the provided parser"""
    start_group = parser.add_argument_group("start")
    start_group.add_argument(
        "-ur",
        "--update-repository",
        action="store_true",
        help="Update local git repository to latest",
    )
    start_group.add_argument(
        "-ud",
        "--update-deps",
        action="store_true",
        help="Update all pip dependencies",
    )
    start_group.add_argument(
        "-nw",
        "--nowheel",
        action="store_true",
        help="Don't upgrade wheel dependencies (exllamav2, torch)",
    )
    start_group.add_argument(
        "--gpu-lib",
        type=str,
        help="Select GPU library. Options: cu121, cu118, amd",
    )


def migrate_gpu_lib():
    gpu_lib_path = pathlib.Path("gpu_lib.txt")

    if not gpu_lib_path.exists():
        return

    print("Migrating gpu_lib.txt to the new start_options.json")
    with open("gpu_lib.txt", "r") as gpu_lib_file:
        start_options["gpu_lib"] = gpu_lib_file.readline().strip()
        start_options["first_run_done"] = True

    # Remove the old file
    gpu_lib_path.unlink()

    print(
        "Successfully migrated gpu lib options to start_options. "
        "The old file has been deleted."
    )


if __name__ == "__main__":
    subprocess.run(["pip", "-V"])

    # Create an argparser and add extra startup script args
    parser = init_argparser()
    add_start_args(parser)
    args = parser.parse_args()
    script_ext = "bat" if platform.system() == "Windows" else "sh"

    start_options_path = pathlib.Path("start_options.json")
    if start_options_path.exists():
        with open(start_options_path) as start_options_file:
            start_options = json.load(start_options_file)
            print("Loaded your saved preferences from `start_options.json`")

        if start_options.get("first_run_done"):
            first_run = False
    else:
        print(
            "It looks like you're running TabbyAPI for the first time. "
            "Getting things ready..."
        )

    # Migrate from old setting storage
    migrate_gpu_lib()

    # Set variables that rely on start options
    first_run = not start_options.get("first_run_done")

    if args.gpu_lib:
        print("Overriding GPU lib name from args.")
        gpu_lib = args.gpu_lib
    elif "gpu_lib" in start_options:
        gpu_lib = start_options.get("gpu_lib")
    else:
        gpu_lib = None

    # Create a config if it doesn't exist
    # This is not necessary to run TabbyAPI, but is new user proof
    config_path = (
        pathlib.Path(args.config) if args.config else pathlib.Path("config.yml")
    )
    if not config_path.exists():
        sample_config_path = pathlib.Path("config_sample.yml")
        copyfile(sample_config_path, config_path)

        print(
            "A config.yml wasn't found.\n"
            f"Created one at {str(config_path.resolve())}"
        )

    if args.update_repository:
        print("Pulling latest changes from Github.")
        pull_command = "git pull"
        subprocess.run(pull_command.split(" "))

    if first_run or args.update_deps:
        install_features = None if args.nowheel else get_install_features(gpu_lib)
        features = f"[{install_features}]" if install_features else ""

        # pip install .[features]
        install_command = f"pip install -U .{features}"
        print(f"Running install command: {install_command}")
        subprocess.run(install_command.split(" "))
        print()

        if args.update_deps:
            print(
                f"Dependencies updated. Please run TabbyAPI with `start.{script_ext}`. "
                "Exiting."
            )
            sys.exit(0)
        else:
            print(
                f"Dependencies installed. Update them with `update_deps.{script_ext}` "
                "inside the `update_scripts` folder."
            )

    if first_run:
        start_options["first_run_done"] = True

    # Save start options
    with open("start_options.json", "w") as start_file:
        start_file.write(json.dumps(start_options))

        print(
            "Successfully wrote your start script options to `start_options.json`. \n"
            "If something goes wrong, editing or deleting the file "
            "will reinstall TabbyAPI as a first-time user."
        )

    # Import entrypoint after installing all requirements
    try:
        from main import entrypoint

        converted_args = convert_args_to_dict(args, parser)

        print("Starting TabbyAPI...")
        entrypoint(converted_args)
    except (ModuleNotFoundError, ImportError):
        traceback.print_exc()
        print(
            "\n"
            "This error was raised because a package was not found.\n"
            "Update your dependencies by running update_scripts/"
            f"update_deps.{'bat' if platform.system() == 'Windows' else 'sh'}\n\n"
        )