from __future__ import annotations

import os
import time
import logging
from collections.abc import Collection

supported_pt_extensions: set[str] = {'.ckpt', '.pt', '.bin', '.pth', '.safetensors', '.pkl', '.sft'}

folder_names_and_paths: dict[str, tuple[list[str], set[str]]] = {}

base_path = os.path.dirname(os.path.realpath(__file__))
models_dir = os.path.join(base_path, "models")
folder_names_and_paths["checkpoints"] = ([os.path.join(models_dir, "checkpoints")], supported_pt_extensions)
folder_names_and_paths["configs"] = ([os.path.join(models_dir, "configs")], [".yaml"])

folder_names_and_paths["loras"] = ([os.path.join(models_dir, "loras")], supported_pt_extensions)
folder_names_and_paths["vae"] = ([os.path.join(models_dir, "vae")], supported_pt_extensions)
folder_names_and_paths["clip"] = ([os.path.join(models_dir, "clip")], supported_pt_extensions)
folder_names_and_paths["unet"] = ([os.path.join(models_dir, "unet")], supported_pt_extensions)
folder_names_and_paths["clip_vision"] = ([os.path.join(models_dir, "clip_vision")], supported_pt_extensions)
folder_names_and_paths["style_models"] = ([os.path.join(models_dir, "style_models")], supported_pt_extensions)
folder_names_and_paths["embeddings"] = ([os.path.join(models_dir, "embeddings")], supported_pt_extensions)
folder_names_and_paths["diffusers"] = ([os.path.join(models_dir, "diffusers")], ["folder"])
folder_names_and_paths["vae_approx"] = ([os.path.join(models_dir, "vae_approx")], supported_pt_extensions)

folder_names_and_paths["controlnet"] = ([os.path.join(models_dir, "controlnet"), os.path.join(models_dir, "t2i_adapter")], supported_pt_extensions)
folder_names_and_paths["gligen"] = ([os.path.join(models_dir, "gligen")], supported_pt_extensions)

folder_names_and_paths["upscale_models"] = ([os.path.join(models_dir, "upscale_models")], supported_pt_extensions)

folder_names_and_paths["custom_nodes"] = ([os.path.join(base_path, "custom_nodes")], set())

folder_names_and_paths["hypernetworks"] = ([os.path.join(models_dir, "hypernetworks")], supported_pt_extensions)

folder_names_and_paths["photomaker"] = ([os.path.join(models_dir, "photomaker")], supported_pt_extensions)

folder_names_and_paths["classifiers"] = ([os.path.join(models_dir, "classifiers")], {""})

output_directory = os.path.join(os.path.dirname(os.path.realpath(__file__)), "output")
temp_directory = os.path.join(os.path.dirname(os.path.realpath(__file__)), "temp")
input_directory = os.path.join(os.path.dirname(os.path.realpath(__file__)), "input")
user_directory = os.path.join(os.path.dirname(os.path.realpath(__file__)), "user")

filename_list_cache: dict[str, tuple[list[str], dict[str, float], float]] = {}

if not os.path.exists(input_directory):
    try:
        os.makedirs(input_directory)
    except:
        logging.error("Failed to create input directory")

def set_output_directory(output_dir: str) -> None:
    global output_directory
    output_directory = output_dir

def set_temp_directory(temp_dir: str) -> None:
    global temp_directory
    temp_directory = temp_dir

def set_input_directory(input_dir: str) -> None:
    global input_directory
    input_directory = input_dir

def get_output_directory() -> str:
    global output_directory
    return output_directory

def get_temp_directory() -> str:
    global temp_directory
    return temp_directory

def get_input_directory() -> str:
    global input_directory
    return input_directory


#NOTE: used in http server so don't put folders that should not be accessed remotely
def get_directory_by_type(type_name: str) -> str | None:
    if type_name == "output":
        return get_output_directory()
    if type_name == "temp":
        return get_temp_directory()
    if type_name == "input":
        return get_input_directory()
    return None


# determine base_dir rely on annotation if name is 'filename.ext [annotation]' format
# otherwise use default_path as base_dir
def annotated_filepath(name: str) -> tuple[str, str | None]:
    if name.endswith("[output]"):
        base_dir = get_output_directory()
        name = name[:-9]
    elif name.endswith("[input]"):
        base_dir = get_input_directory()
        name = name[:-8]
    elif name.endswith("[temp]"):
        base_dir = get_temp_directory()
        name = name[:-7]
    else:
        return name, None

    return name, base_dir


def get_annotated_filepath(name: str, default_dir: str | None=None) -> str:
    name, base_dir = annotated_filepath(name)

    if base_dir is None:
        if default_dir is not None:
            base_dir = default_dir
        else:
            base_dir = get_input_directory()  # fallback path

    return os.path.join(base_dir, name)


def exists_annotated_filepath(name) -> bool:
    name, base_dir = annotated_filepath(name)

    if base_dir is None:
        base_dir = get_input_directory()  # fallback path

    filepath = os.path.join(base_dir, name)
    return os.path.exists(filepath)


def add_model_folder_path(folder_name: str, full_folder_path: str) -> None:
    global folder_names_and_paths
    if folder_name in folder_names_and_paths:
        folder_names_and_paths[folder_name][0].append(full_folder_path)
    else:
        folder_names_and_paths[folder_name] = ([full_folder_path], set())

def get_folder_paths(folder_name: str) -> list[str]:
    return folder_names_and_paths[folder_name][0][:]

def recursive_search(directory: str, excluded_dir_names: list[str] | None=None) -> tuple[list[str], dict[str, float]]:
    if not os.path.isdir(directory):
        return [], {}

    if excluded_dir_names is None:
        excluded_dir_names = []

    result = []
    dirs = {}

    # Attempt to add the initial directory to dirs with error handling
    try:
        dirs[directory] = os.path.getmtime(directory)
    except FileNotFoundError:
        logging.warning(f"Warning: Unable to access {directory}. Skipping this path.")

    logging.debug("recursive file list on directory {}".format(directory))
    dirpath: str
    subdirs: list[str]
    filenames: list[str]

    for dirpath, subdirs, filenames in os.walk(directory, followlinks=True, topdown=True):
        subdirs[:] = [d for d in subdirs if d not in excluded_dir_names]
        for file_name in filenames:
            relative_path = os.path.relpath(os.path.join(dirpath, file_name), directory)
            result.append(relative_path)

        for d in subdirs:
            path: str = os.path.join(dirpath, d)
            try:
                dirs[path] = os.path.getmtime(path)
            except FileNotFoundError:
                logging.warning(f"Warning: Unable to access {path}. Skipping this path.")
                continue
    logging.debug("found {} files".format(len(result)))
    return result, dirs

def filter_files_extensions(files: Collection[str], extensions: Collection[str]) -> list[str]:
    return sorted(list(filter(lambda a: os.path.splitext(a)[-1].lower() in extensions or len(extensions) == 0, files)))



def get_full_path(folder_name: str, filename: str) -> str | None:
    global folder_names_and_paths
    if folder_name not in folder_names_and_paths:
        return None
    folders = folder_names_and_paths[folder_name]
    filename = os.path.relpath(os.path.join("/", filename), "/")
    for x in folders[0]:
        full_path = os.path.join(x, filename)
        if os.path.isfile(full_path):
            return full_path
        elif os.path.islink(full_path):
            logging.warning("WARNING path {} exists but doesn't link anywhere, skipping.".format(full_path))

    return None

def get_filename_list_(folder_name: str) -> tuple[list[str], dict[str, float], float]:
    global folder_names_and_paths
    output_list = set()
    folders = folder_names_and_paths[folder_name]
    output_folders = {}
    for x in folders[0]:
        files, folders_all = recursive_search(x, excluded_dir_names=[".git"])
        output_list.update(filter_files_extensions(files, folders[1]))
        output_folders = {**output_folders, **folders_all}

    return sorted(list(output_list)), output_folders, time.perf_counter()

def cached_filename_list_(folder_name: str) -> tuple[list[str], dict[str, float], float] | None:
    global filename_list_cache
    global folder_names_and_paths
    if folder_name not in filename_list_cache:
        return None
    out = filename_list_cache[folder_name]

    for x in out[1]:
        time_modified = out[1][x]
        folder = x
        if os.path.getmtime(folder) != time_modified:
            return None

    folders = folder_names_and_paths[folder_name]
    for x in folders[0]:
        if os.path.isdir(x):
            if x not in out[1]:
                return None

    return out

def get_filename_list(folder_name: str) -> list[str]:
    out = cached_filename_list_(folder_name)
    if out is None:
        out = get_filename_list_(folder_name)
        global filename_list_cache
        filename_list_cache[folder_name] = out
    return list(out[0])

def get_save_image_path(filename_prefix: str, output_dir: str, image_width=0, image_height=0) -> tuple[str, str, int, str, str]:
    def map_filename(filename: str) -> tuple[int, str]:
        prefix_len = len(os.path.basename(filename_prefix))
        prefix = filename[:prefix_len + 1]
        try:
            digits = int(filename[prefix_len + 1:].split('_')[0])
        except:
            digits = 0
        return digits, prefix

    def compute_vars(input: str, image_width: int, image_height: int) -> str:
        input = input.replace("%width%", str(image_width))
        input = input.replace("%height%", str(image_height))
        return input

    filename_prefix = compute_vars(filename_prefix, image_width, image_height)

    subfolder = os.path.dirname(os.path.normpath(filename_prefix))
    filename = os.path.basename(os.path.normpath(filename_prefix))

    full_output_folder = os.path.join(output_dir, subfolder)

    if os.path.commonpath((output_dir, os.path.abspath(full_output_folder))) != output_dir:
        err = "**** ERROR: Saving image outside the output folder is not allowed." + \
              "\n full_output_folder: " + os.path.abspath(full_output_folder) + \
              "\n         output_dir: " + output_dir + \
              "\n         commonpath: " + os.path.commonpath((output_dir, os.path.abspath(full_output_folder)))
        logging.error(err)
        raise Exception(err)

    try:
        counter = max(filter(lambda a: os.path.normcase(a[1][:-1]) == os.path.normcase(filename) and a[1][-1] == "_", map(map_filename, os.listdir(full_output_folder))))[0] + 1
    except ValueError:
        counter = 1
    except FileNotFoundError:
        os.makedirs(full_output_folder, exist_ok=True)
        counter = 1
    return full_output_folder, filename, counter, subfolder, filename_prefix