import asyncio
import os
import json
import shutil
import inspect
import aiohttp
from server import PromptServer
from tqdm import tqdm

config = None


def is_logging_enabled():
    config = get_extension_config()
    if "logging" not in config:
        return False
    return config["logging"]


def log(message, type=None, always=False, name=None):
    if not always and not is_logging_enabled():
        return

    if type is not None:
        message = f"[{type}] {message}"

    if name is None:
        name = get_extension_config()["name"]

    print(f"(lam:{name}) {message}")


def get_ext_dir(subpath=None, mkdir=False):
    dir = os.path.dirname(__file__)
    if subpath is not None:
        dir = os.path.join(dir, subpath)

    dir = os.path.abspath(dir)

    if mkdir and not os.path.exists(dir):
        os.makedirs(dir)
    return dir


def get_comfy_dir(subpath=None, mkdir=False):
    dir = os.path.dirname(inspect.getfile(PromptServer))
    if subpath is not None:
        dir = os.path.join(dir, subpath)

    dir = os.path.abspath(dir)

    if mkdir and not os.path.exists(dir):
        os.makedirs(dir)
    return dir


def get_web_ext_dir():
    config = get_extension_config()
    name = config["name"]
    dir = get_comfy_dir("web/extensions/lam")
    if not os.path.exists(dir):
        os.makedirs(dir)
    dir = os.path.join(dir, name)
    return dir


def get_extension_config(reload=False):
    global config
    if reload == False and config is not None:
        return config

    config_path = get_ext_dir("lam.json")
    if not os.path.exists(config_path):
        log("Missing lam.json, this extension may not work correctly. Please reinstall the extension.",
            type="ERROR", always=True, name="???")
        print(f"Extension path: {get_ext_dir()}")
        return {"name": "Unknown", "version": -1}
    with open(config_path, "r") as f:
        config = json.loads(f.read())
    return config


def link_js(src, dst):
    src = os.path.abspath(src)
    dst = os.path.abspath(dst)
    if os.name == "nt":
        try:
            import _winapi
            _winapi.CreateJunction(src, dst)
            return True
        except:
            pass
    try:
        os.symlink(src, dst)
        return True
    except:
        import logging
        logging.exception('')
        return False

def is_junction(path):
    if os.name != "nt":
        return False
    try:
        return bool(os.readlink(path))
    except OSError:
        return False

def install_js():
    src_dir = get_ext_dir("js")
    if not os.path.exists(src_dir):
        log("No JS")
        return

    dst_dir = get_web_ext_dir()

    if os.path.exists(dst_dir):
        if os.path.islink(dst_dir) or is_junction(dst_dir):
            log("JS already linked")
            return
    elif link_js(src_dir, dst_dir):
        log("JS linked")
        return

    log("Copying JS files")
    shutil.copytree(src_dir, dst_dir, dirs_exist_ok=True)


def init(check_imports=None):
    log("Init")

    if check_imports is not None:
        import importlib.util
        for imp in check_imports:
            spec = importlib.util.find_spec(imp)
            if spec is None:
                log(f"{imp} is required, please check requirements are installed.",
                    type="ERROR", always=True)
                return False

    install_js()
    return True


def get_async_loop():
    loop = None
    try:
        loop = asyncio.get_event_loop()
    except:
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    return loop


def get_http_session():
    loop = get_async_loop()
    return aiohttp.ClientSession(loop=loop)


async def download(url, stream, update_callback=None, session=None):
    close_session = False
    if session is None:
        close_session = True
        session = get_http_session()
    try:
        async with session.get(url) as response:
            size = int(response.headers.get('content-length', 0)) or None

            with tqdm(
                unit='B', unit_scale=True, miniters=1, desc=url.split('/')[-1], total=size,
            ) as progressbar:
                perc = 0
                async for chunk in response.content.iter_chunked(2048):
                    stream.write(chunk)
                    progressbar.update(len(chunk))
                    if update_callback is not None and progressbar.total is not None and progressbar.total != 0:
                        last = perc
                        perc = round(progressbar.n / progressbar.total, 2)
                        if perc != last:
                            last = perc
                            await update_callback(perc)
    finally:
        if close_session and session is not None:
            await session.close()


async def download_to_file(url, destination, update_callback=None, is_ext_subpath=True, session=None):
    if is_ext_subpath:
        destination = get_ext_dir(destination)
    with open(destination, mode='wb') as f:
        download(url, f, update_callback, session)


def wait_for_async(async_fn, loop=None):
    res = []

    async def run_async():
        r = await async_fn()
        res.append(r)

    if loop is None:
        try:
            loop = asyncio.get_event_loop()
        except:
            loop = asyncio.new_event_loop()
            asyncio.set_event_loop(loop)

    loop.run_until_complete(run_async())

    return res[0]


def update_node_status(client_id, node, text, progress=None):
    if client_id is None:
        client_id = PromptServer.instance.client_id

    if client_id is None:
        return

    PromptServer.instance.send_sync("lam/update_status", {
        "node": node,
        "progress": progress,
        "text": text
    }, client_id)


async def update_node_status_async(client_id, node, text, progress=None):
    if client_id is None:
        client_id = PromptServer.instance.client_id

    if client_id is None:
        return

    await PromptServer.instance.send("lam/update_status", {
        "node": node,
        "progress": progress,
        "text": text
    }, client_id)


def get_config_value(key, default=None, throw=False):
    split = key.split(".")
    obj = get_extension_config()
    for s in split:
        if s in split:
            obj = obj[s]
        else:
            if throw:
                raise KeyError("Configuration key missing: " + key)
            else:
                return default
    return obj


def is_inside_dir(root_dir, check_path):
    root_dir = os.path.abspath(root_dir)
    if not os.path.isabs(check_path):
        check_path = os.path.abspath(os.path.join(root_dir, check_path))
    return os.path.commonpath([check_path, root_dir]) == root_dir


def get_child_dir(root_dir, child_path, throw_if_outside=True):
    child_path = os.path.abspath(os.path.join(root_dir, child_path))
    if is_inside_dir(root_dir, child_path):
        return child_path
    if throw_if_outside:
        raise NotADirectoryError(
            "Saving outside the target folder is not allowed.")
    return None