import os
import random
import subprocess
import sys
from enum import Enum, unique

from . import launcher
from .api.app import run_api
from .chat.chat_model import run_chat
from .eval.evaluator import run_eval
from .extras.logging import get_logger
from .extras.misc import get_device_count
from .train.tuner import export_model, run_exp
from .webui.interface import run_web_demo, run_web_ui


USAGE = (
    "-" * 70
    + "\n"
    + "| Usage:                                                             |\n"
    + "|   llamafactory-cli api -h: launch an OpenAI-style API server       |\n"
    + "|   llamafactory-cli chat -h: launch a chat interface in CLI         |\n"
    + "|   llamafactory-cli eval -h: evaluate models                        |\n"
    + "|   llamafactory-cli export -h: merge LoRA adapters and export model |\n"
    + "|   llamafactory-cli train -h: train models                          |\n"
    + "|   llamafactory-cli webchat -h: launch a chat interface in Web UI   |\n"
    + "|   llamafactory-cli webui: launch LlamaBoard                        |\n"
    + "|   llamafactory-cli version: show version info                      |\n"
    + "-" * 70
)

VERSION = "0.7.2.dev0"

WELCOME = (
    "-" * 58
    + "\n"
    + "| Welcome to LLaMA Factory, version {}".format(VERSION)
    + " " * (21 - len(VERSION))
    + "|\n|"
    + " " * 56
    + "|\n"
    + "| Project page: https://github.com/hiyouga/LLaMA-Factory |\n"
    + "-" * 58
)

logger = get_logger(__name__)


@unique
class Command(str, Enum):
    API = "api"
    CHAT = "chat"
    EVAL = "eval"
    EXPORT = "export"
    TRAIN = "train"
    WEBDEMO = "webchat"
    WEBUI = "webui"
    VER = "version"
    HELP = "help"


def main():
    command = sys.argv.pop(1)
    if command == Command.API:
        run_api()
    elif command == Command.CHAT:
        run_chat()
    elif command == Command.EVAL:
        run_eval()
    elif command == Command.EXPORT:
        export_model()
    elif command == Command.TRAIN:
        if get_device_count() > 1:
            nnodes = os.environ.get("NNODES", "1")
            node_rank = os.environ.get("RANK", "0")
            nproc_per_node = os.environ.get("NPROC_PER_NODE", str(get_device_count()))
            master_addr = os.environ.get("MASTER_ADDR", "127.0.0.1")
            master_port = os.environ.get("MASTER_PORT", str(random.randint(20001, 29999)))
            logger.info("Initializing distributed tasks at: {}:{}".format(master_addr, master_port))
            subprocess.run(
                [
                    "torchrun",
                    "--nnodes",
                    nnodes,
                    "--node_rank",
                    node_rank,
                    "--nproc_per_node",
                    nproc_per_node,
                    "--master_addr",
                    master_addr,
                    "--master_port",
                    master_port,
                    launcher.__file__,
                    *sys.argv[1:],
                ]
            )
        else:
            run_exp()
    elif command == Command.WEBDEMO:
        run_web_demo()
    elif command == Command.WEBUI:
        run_web_ui()
    elif command == Command.VER:
        print(WELCOME)
    elif command == Command.HELP:
        print(USAGE)
    else:
        raise NotImplementedError("Unknown command: {}".format(command))