import asyncio
import os
import re
from uuid import uuid4

import torch
import torch.distributed
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
import uvicorn.logging
import uvicorn
import sys
import atexit
project_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
from fastapi.middleware.cors import CORSMiddleware
from ktransformers.server.args import ArgumentParser
from ktransformers.server.config.config import Config
from ktransformers.util import utils
from ktransformers.server.utils.create_interface import create_interface, GlobalInterface, get_thread_context_manager
from fastapi.openapi.utils import get_openapi
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from ktransformers.server.api import router, post_db_creation_operations
from ktransformers.server.utils.sql_utils import Base, SQLUtil
from ktransformers.server.config.log import logger
import subprocess
import tempfile

def mount_app_routes(mount_app: FastAPI):
    sql_util = SQLUtil()
    logger.info("Creating SQL tables")
    Base.metadata.create_all(bind=sql_util.sqlalchemy_engine)
    post_db_creation_operations()
    mount_app.include_router(router)


def create_app():
    cfg = Config()
    if(hasattr(GlobalInterface.interface, "lifespan")):
        app = FastAPI(lifespan=GlobalInterface.interface.lifespan)
    else:
        app = FastAPI()
    if Config().web_cross_domain:
        app.add_middleware(
            CORSMiddleware,
            allow_origins=["*"],
            allow_credentials=True,
            allow_methods=["*"],
            allow_headers=["*"],
        )
    mount_app_routes(app)
    if cfg.mount_web:
        mount_index_routes(app)
    return app


def update_web_port(config_file: str):
    ip_port_pattern = (
        r"(localhost|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)):[0-9]{1,5}"
    )
    with open(config_file, "r", encoding="utf-8") as f_cfg:
        web_config = f_cfg.read()
    ip_port = "localhost:" + str(Config().server_port)
    new_web_config = re.sub(ip_port_pattern, ip_port, web_config)
    with open(config_file, "w", encoding="utf-8") as f_cfg:
        f_cfg.write(new_web_config)


def mount_index_routes(app: FastAPI):
    project_dir = os.path.dirname(os.path.dirname(__file__))
    web_dir = os.path.join(project_dir, "website/dist")
    web_config_file = os.path.join(web_dir, "config.js")
    update_web_port(web_config_file)
    if os.path.exists(web_dir):
        app.mount("/web", StaticFiles(directory=web_dir), name="static")
    else:
        err_str = f"No website resources in {web_dir}, please complile the website by npm first"
        logger.error(err_str)
        print(err_str)
        exit(1)


def run_api(app, host, port, **kwargs):
    if kwargs.get("ssl_keyfile") and kwargs.get("ssl_certfile"):
        uvicorn.run(
            app,
            host=host,
            port=port,
            ssl_keyfile=kwargs.get("ssl_keyfile"),
            ssl_certfile=kwargs.get("ssl_certfile"),
        )
    else:
        uvicorn.run(app, host=host, port=port, log_level="debug")


def custom_openapi(app):
    if app.openapi_schema:
        return app.openapi_schema
    openapi_schema = get_openapi(
        title="ktransformers server",
        version="1.0.0",
        summary="This is a server that provides a RESTful API for ktransformers.",
        description="We provided chat completion and openai assistant interfaces.",
        routes=app.routes,
    )
    openapi_schema["info"]["x-logo"] = {"url": "https://kvcache.ai/media/icon_1.png"}
    app.openapi_schema = openapi_schema
    return app.openapi_schema


def verify_arg(args):
    nproc_per_node = int(os.getenv('LOCAL_WORLD_SIZE'))

    if args.batch_size not in [1, 2, 3, 4]:
        raise ValueError(f'argument batch_size should be in [1, 2, 3, 4], got {args.batch_size}')

    if nproc_per_node not in [1, 2]:
        raise ValueError(f'argument nproc_per_node should be in [1, 2], got {nproc_per_node}')

    if args.tp not in [1, 2]:
        raise ValueError(f'argument tp should be in [1, 2], got {args.tp}')

    if nproc_per_node != args.tp:
        raise ValueError(f'argument nproc_per_node should be equal to tp, got nproc_per_node is {nproc_per_node}, tp is {args.tp}')


def main():
    try:
        import torch_npu
        use_npu = torch.npu.is_available()
        torch.npu.config.allow_internal_format = True
    except:
        use_npu = False

    cfg = Config()

    arg_parser = ArgumentParser(cfg)

    args = arg_parser.parse_args()
    if use_npu:
        verify_arg(args)

        rank_id = int(os.environ["RANK"])
        args.device = args.device[:-1] + str(rank_id)
    create_interface(config=cfg, default_args=cfg, input_args=args)

    tp_size = args.tp
    world_size = int(os.getenv("WORLD_SIZE", '1'))
    if tp_size == world_size and tp_size > 1:
        if rank_id == 0:
            app = create_app()
            custom_openapi(app)
            run_api(
                app=app,
                host=args.host,
                port=args.port,
                ssl_keyfile=args.ssl_keyfile,
                ssl_certfile=args.ssl_certfile,
            )
        elif cfg.backend_type == 'ktransformers':
            while True:
                try:
                    context = get_thread_context_manager()
                    id = str(uuid4())
                    context.interface.sync_inference("", id, 1.0, 1.0)
                except Exception as e:
                    print(f"An error occurred: {e}")
                finally:
                    pass
    else:
        app = create_app()
        custom_openapi(app)

        run_api(
            app=app,
            host=args.host,
            port=args.port,
            ssl_keyfile=args.ssl_keyfile,
            ssl_certfile=args.ssl_certfile,
        )

if __name__ == "__main__":
    main()