import os
import pathlib
import sys
import copy
import hashlib
import importlib

from aiohttp import web
import server
import urllib.parse
import struct
import json
import requests
requests.packages.urllib3.disable_warnings()

import folder_paths

config_loader_path = os.path.join(os.path.dirname(__file__), 'config_loader.py')
config_loader_spec = importlib.util.spec_from_file_location('config_loader', config_loader_path)
config_loader = importlib.util.module_from_spec(config_loader_spec)
config_loader_spec.loader.exec_module(config_loader)

comfyui_model_uri = os.path.join(os.getcwd(), "models")
extension_uri = os.path.join(os.getcwd(), "custom_nodes" + os.path.sep + "ComfyUI-Model-Manager")
index_uri = os.path.join(extension_uri, "index.json")
#checksum_cache_uri = os.path.join(extension_uri, "checksum_cache.txt")
no_preview_image = os.path.join(extension_uri, "no-preview.png")
ui_settings_uri = os.path.join(extension_uri, "ui_settings.yaml")

fallback_model_extensions = set([".bin", ".ckpt", ".onnx", ".pt", ".pth", ".safetensors"]) # TODO: magic values
image_extensions = (".apng", ".gif", ".jpeg", ".jpg", ".png", ".webp")
#video_extensions = (".avi", ".mp4", ".webm") # TODO: Requires ffmpeg or cv2. Cache preview frame?

#hash_buffer_size = 4096

_folder_names_and_paths = None # dict[str, tuple[list[str], list[str]]]
def folder_paths_folder_names_and_paths(refresh = False):
    global _folder_names_and_paths
    if refresh or _folder_names_and_paths is None:
        _folder_names_and_paths = {}
        for item_name in os.listdir(comfyui_model_uri):
            item_path = os.path.join(comfyui_model_uri, item_name)
            if not os.path.isdir(item_path):
                continue
            if item_name == "configs":
                continue
            if item_name in folder_paths.folder_names_and_paths:
                dir_paths, extensions = copy.deepcopy(folder_paths.folder_names_and_paths[item_name])
            else:
                dir_paths = [item_path]
                extensions = copy.deepcopy(fallback_model_extensions)
            _folder_names_and_paths[item_name] = (dir_paths, extensions)
    return _folder_names_and_paths

def folder_paths_get_folder_paths(folder_name, refresh = False): # API function crashes querying unknown model folder
    paths = folder_paths_folder_names_and_paths(refresh)
    if folder_name in paths:
        return paths[folder_name][0]

    maybe_path = os.path.join(comfyui_model_uri, folder_name)
    if os.path.exists(maybe_path):
        return [maybe_path]
    return []

def folder_paths_get_supported_pt_extensions(folder_name, refresh = False): # Missing API function
    paths = folder_paths_folder_names_and_paths(refresh)
    if folder_name in paths:
        return paths[folder_name][1]
    model_extensions = copy.deepcopy(fallback_model_extensions)
    return model_extensions


def get_safetensor_header(path):
    try:
        with open(path, "rb") as f:
            length_of_header = struct.unpack("<Q", f.read(8))[0]
            header_bytes = f.read(length_of_header)
            header_json = json.loads(header_bytes)
            return header_json
    except:
        return {}


def end_swap_and_pop(x, i):
    x[i], x[-1] = x[-1], x[i]
    return x.pop(-1)


def model_type_to_dir_name(model_type):
    if model_type == "checkpoint": return "checkpoints"
    #elif model_type == "clip": return "clip"
    #elif model_type == "clip_vision": return "clip_vision"
    #elif model_type == "controlnet": return "controlnet"
    elif model_type == "diffuser": return "diffusers"
    elif model_type == "embedding": return "embeddings"
    #elif model_type== "gligen": return "gligen"
    elif model_type == "hypernetwork": return "hypernetworks"
    elif model_type == "lora": return "loras"
    #elif model_type == "style_models": return "style_models"
    #elif model_type == "unet": return "unet"
    elif model_type == "upscale_model": return "upscale_models"
    #elif model_type == "vae": return "vae"
    #elif model_type == "vae_approx": return "vae_approx"
    else: return model_type


def ui_rules():
    Rule = config_loader.Rule
    return [
        Rule("sidebar-default-height", 0.5, float, 0.0, 1.0),
        Rule("sidebar-default-width", 0.5, float, 0.0, 1.0),
        Rule("model-search-always-append", "", str),
        Rule("model-persistent-search", True, bool),
        Rule("model-show-label-extensions", False, bool),
        Rule("model-show-add-button", True, bool),
        Rule("model-show-copy-button", True, bool),
        Rule("model-add-embedding-extension", False, bool),
        Rule("model-add-drag-strict-on-field", False, bool),
        Rule("model-add-offset", 25, int),
    ]


#def server_rules():
#    Rule = config_loader.Rule
#    return [
#        Rule("model_extension_download_whitelist", [".safetensors"], list),
#        Rule("civitai_api_key", "", str),
#    ]


@server.PromptServer.instance.routes.get("/model-manager/settings/load")
async def load_ui_settings(request):
    rules = ui_rules()
    settings = config_loader.yaml_load(ui_settings_uri, rules)
    return web.json_response({ "settings": settings })


@server.PromptServer.instance.routes.post("/model-manager/settings/save")
async def save_ui_settings(request):
    body = await request.json()
    settings = body.get("settings")
    rules = ui_rules()
    validated_settings = config_loader.validated(rules, settings)
    success = config_loader.yaml_save(ui_settings_uri, rules, validated_settings)
    return web.json_response({
        "success": success,
        "settings": validated_settings if success else "",
    })


@server.PromptServer.instance.routes.get("/model-manager/image-preview")
async def img_preview(request):
    uri = request.query.get("uri")

    image_path = no_preview_image
    image_extension = "png"

    if uri != "no-post":
        rel_image_path = os.path.dirname(uri)

        i = uri.find(os.path.sep)
        model_type = uri[0:i]

        j = uri.find(os.path.sep, i + len(os.path.sep))
        if j == -1:
            j = len(rel_image_path)
        base_index = int(uri[i + len(os.path.sep):j])
        base_path = folder_paths_get_folder_paths(model_type)[base_index]

        abs_image_path = os.path.normpath(base_path + os.path.sep + uri[j:]) # do NOT use os.path.join
        if os.path.exists(abs_image_path):
            image_path = abs_image_path
            _, image_extension = os.path.splitext(uri)
            image_extension = image_extension[1:]

    with open(image_path, "rb") as img_file:
        image_data = img_file.read()

    return web.Response(body=image_data, content_type="image/" + image_extension)

#def calculate_sha256(file_path):
#    try:
#        with open(file_path, "rb") as f:
#            sha256 = hashlib.sha256()
#            while True:
#                data = f.read(hash_buffer_size)
#                if not data:
#                    break
#                sha256.update(data)
#        return sha256.hexdigest()
#    except:
#        return ""

@server.PromptServer.instance.routes.get("/model-manager/source")
async def load_source_from(request):
    uri = request.query.get("uri", "local")
    if uri == "local":
        with open(index_uri) as file:
            dataSource = json.load(file)
    else:
        response = requests.get(uri)
        dataSource = response.json()

    model_types = os.listdir(comfyui_model_uri)
    model_types.remove("configs")
    sourceSorted = {}
    for model_type in model_types:
        sourceSorted[model_type] = []
    for item in dataSource:
        item_model_type = model_type_to_dir_name(item.get("type"))
        sourceSorted[item_model_type].append(item)
        item["installed"] = False

    #checksum_cache = []
    #if os.path.exists(checksum_cache_uri):
    #    with open(checksum_cache_uri, "r") as file:
    #        checksum_cache = file.read().splitlines()
    #else:
    #    with open(checksum_cache_uri, "w") as file:
    #        pass
    #print(checksum_cache)

    for model_type in model_types:
        for model_base_path in folder_paths_get_folder_paths(model_type):
            if not os.path.exists(model_base_path): # Bug in main code?
                continue
            for cwd, _subdirs, files in os.walk(model_base_path):
                for file in files:
                    source_type = sourceSorted[model_type]
                    for iItem in range(len(source_type)-1,-1,-1):
                        item = source_type[iItem]

                        # TODO: Make hashing optional (because it is slow to compute).
                        if file != item.get("name"):
                            continue

                        #file_path = os.path.join(cwd, file)
                        #file_size = int(item.get("size") or 0)
                        #if os.path.getsize(file_path) != file_size:
                        #    continue
                        #
                        #checksum = item.get("SHA256")
                        #if checksum == "" or checksum == None:
                        #    continue
                        # BUG: Model always hashed if same size but different hash.
                        # TODO: Change code to save list (NOT dict) with absolute model path and checksum on each line
                        #if checksum not in checksum_cache:
                        #    sha256 = calculate_sha256(file_path) # TODO: Make checksum optional!
                        #    checksum_cache.append(sha256)
                        #    print(f"{file}: calc:{sha256}, real:{checksum}")
                        #    if sha256 != checksum:
                        #        continue

                        item["installed"] = True
                        end_swap_and_pop(source_type, iItem)

    #with open(checksum_cache_uri, "w") as file:
    #    file.writelines(checksum + '\n' for checksum in checksum_cache) # because python is a mess

    return web.json_response(dataSource)


@server.PromptServer.instance.routes.get("/model-manager/models")
async def load_download_models(request):
    model_types = os.listdir(comfyui_model_uri)
    model_types.remove("configs")
    model_types.sort()

    models = {}
    for model_type in model_types:
        model_extensions = tuple(folder_paths_get_supported_pt_extensions(model_type))
        file_infos = []
        for base_path_index, model_base_path in enumerate(folder_paths_get_folder_paths(model_type)):
            if not os.path.exists(model_base_path): # Bug in main code?
                continue
            for cwd, _subdirs, files in os.walk(model_base_path):
                dir_models = []
                dir_images = []

                for file in files:
                    if file.lower().endswith(model_extensions):
                        dir_models.append(file)
                    elif file.lower().endswith(image_extensions):
                        dir_images.append(file)

                for model in dir_models:
                    model_name, _ = os.path.splitext(model)
                    image = None
                    for iImage in range(len(dir_images)-1, -1, -1):
                        image_name, _ = os.path.splitext(dir_images[iImage])
                        if model_name == image_name:
                            image = end_swap_and_pop(dir_images, iImage)
                            break
                    abs_path = os.path.join(cwd, model)
                    stats = pathlib.Path(abs_path).stat()
                    date_modified = stats.st_mtime_ns
                    date_created = stats.st_ctime_ns
                    rel_path = "" if cwd == model_base_path else os.path.relpath(cwd, model_base_path)
                    info = (model, image, base_path_index, rel_path, date_modified, date_created)
                    file_infos.append(info)
        file_infos.sort(key=lambda tup: tup[4], reverse=True) # TODO: remove sort; sorted on client

        model_items = []
        for model, image, base_path_index, rel_path, date_modified, date_created in file_infos:
            # TODO: Stop sending redundant path information
            item = {
                "name": model,
                "searchPath": "/" + os.path.join(model_type, str(base_path_index), rel_path, model).replace(os.path.sep, "/"), # TODO: Remove hack
                "path": os.path.join(rel_path, model),
                "dateModified": date_modified,
                "dateCreated": date_created,
                #"dateLastUsed": "", # TODO: track server-side, send increment client-side
                #"countUsed": 0, # TODO: track server-side, send increment client-side
            }
            if image is not None:
                raw_post = os.path.join(model_type, str(base_path_index), rel_path, image)
                item["post"] = urllib.parse.quote_plus(raw_post)
            model_items.append(item)

        models[model_type] = model_items

    return web.json_response(models)


def linear_directory_hierarchy(refresh = False):
    model_paths = folder_paths_folder_names_and_paths(refresh)
    dir_list = []
    dir_list.append({ "name": "", "childIndex": 1, "childCount": len(model_paths) })
    for model_dir_name, (model_dirs, _) in model_paths.items():
        dir_list.append({ "name": model_dir_name, "childIndex": None, "childCount": len(model_dirs) })
    for model_dir_index, (_, (model_dirs, extension_whitelist)) in enumerate(model_paths.items()):
        model_dir_child_index = len(dir_list)
        dir_list[model_dir_index + 1]["childIndex"] = model_dir_child_index
        for dir_path_index, dir_path in enumerate(model_dirs):
            dir_list.append({ "name": str(dir_path_index), "childIndex": None, "childCount": None })
        for dir_path_index, dir_path in enumerate(model_dirs):
            if not os.path.exists(dir_path) or os.path.isfile(dir_path):
                continue

            #dir_list.append({ "name": str(dir_path_index), "childIndex": None, "childCount": 0 })
            dir_stack = [(dir_path, model_dir_child_index + dir_path_index)]
            while len(dir_stack) > 0: # DEPTH-FIRST
                dir_path, dir_index = dir_stack.pop()
                
                dir_items = os.listdir(dir_path)
                dir_items = sorted(dir_items, key=str.casefold)
                
                dir_child_count = 0
                
                # TODO: sort content of directory: alphabetically
                # TODO: sort content of directory: files first
                
                subdirs = []
                for item_name in dir_items: # BREADTH-FIRST
                    item_path = os.path.join(dir_path, item_name)
                    if os.path.isdir(item_path):
                        # dir
                        subdir_index = len(dir_list) # this must be done BEFORE `dir_list.append`
                        subdirs.append((item_path, subdir_index))
                        dir_list.append({ "name": item_name, "childIndex": None, "childCount": 0 })
                        dir_child_count += 1
                    else:
                        # file
                        _, file_extension = os.path.splitext(item_name)
                        if extension_whitelist is None or file_extension in extension_whitelist:
                            dir_list.append({ "name": item_name })
                            dir_child_count += 1
                if dir_child_count > 0:
                    dir_list[dir_index]["childIndex"] = len(dir_list) - dir_child_count
                dir_list[dir_index]["childCount"] = dir_child_count
                subdirs.reverse()
                for dir_path, subdir_index in subdirs:
                    dir_stack.append((dir_path, subdir_index))
    return dir_list


@server.PromptServer.instance.routes.get("/model-manager/model-directory-list")
async def directory_list(request):
    #body = await request.json()
    dir_list = linear_directory_hierarchy(True)
    #json.dump(dir_list, sys.stdout, indent=4)
    return web.json_response(dir_list)


def_headers = {
    "User-Agent": "Mozilla/5.0 (iPad; CPU OS 12_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148"
}


def download_model_file(url, filename):
    dl_filename = filename + ".download"

    rh = requests.get(
        url=url, stream=True, verify=False, headers=def_headers, proxies=None
    )
    print("temp file is " + dl_filename)
    total_size = int(rh.headers["Content-Length"])

    basename, ext = os.path.splitext(filename)
    print("Start download {}, file size: {}".format(basename, total_size))

    downloaded_size = 0
    if os.path.exists(dl_filename):
        downloaded_size = os.path.getsize(download_file)

    headers = {"Range": "bytes=%d-" % downloaded_size}
    headers["User-Agent"] = def_headers["User-Agent"]

    r = requests.get(url=url, stream=True, verify=False, headers=headers, proxies=None)

    with open(dl_filename, "ab") as f:
        for chunk in r.iter_content(chunk_size=1024):
            if chunk is not None:
                downloaded_size += len(chunk)
                f.write(chunk)
                f.flush()

                progress = int(50 * downloaded_size / total_size)
                sys.stdout.reconfigure(encoding="utf-8")
                sys.stdout.write(
                    "\r[%s%s] %d%%"
                    % (
                        "-" * progress,
                        " " * (50 - progress),
                        100 * downloaded_size / total_size,
                    )
                )
                sys.stdout.flush()

    print()
    os.rename(dl_filename, filename)


@server.PromptServer.instance.routes.post("/model-manager/download")
async def download_file(request):
    body = await request.json()
    model_type = body.get("type")
    model_type_path = model_type_to_dir_name(model_type)
    if model_type_path is None:
        return web.json_response({"success": False})

    download_uri = body.get("download")
    if download_uri is None:
        return web.json_response({"success": False})

    model_name = body.get("name")
    file_name = os.path.join(comfyui_model_uri, model_type_path, model_name)
    download_model_file(download_uri, file_name)
    print("File download completed!")
    return web.json_response({"success": True})


WEB_DIRECTORY = "web"
NODE_CLASS_MAPPINGS = {}
__all__ = ["NODE_CLASS_MAPPINGS"]