import argparse
import os
import sys
import modules.safe

script_path = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))

# Parse the --data-dir flag first so we can use it as a base for our other argument default values
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("--data-dir", type=str, default=os.path.dirname(os.path.dirname(os.path.realpath(__file__))), help="base path where all user data is stored",)
cmd_opts_pre = parser.parse_known_args()[0]
data_path = cmd_opts_pre.data_dir
models_path = os.path.join(data_path, "models")

# data_path = cmd_opts_pre.data
sys.path.insert(0, script_path)

# search for directory of stable diffusion in following places
sd_path = None
possible_sd_paths = [os.path.join(script_path, 'repositories/stable-diffusion-stability-ai'), '.', os.path.dirname(script_path)]
for possible_sd_path in possible_sd_paths:
    if os.path.exists(os.path.join(possible_sd_path, 'ldm/models/diffusion/ddpm.py')):
        sd_path = os.path.abspath(possible_sd_path)
        break

assert sd_path is not None, "Couldn't find Stable Diffusion in any of: " + str(possible_sd_paths)

path_dirs = [
    (sd_path, 'ldm', 'Stable Diffusion', []),
    (os.path.join(sd_path, '../taming-transformers'), 'taming', 'Taming Transformers', []),
    (os.path.join(sd_path, '../CodeFormer'), 'inference_codeformer.py', 'CodeFormer', []),
    (os.path.join(sd_path, '../BLIP'), 'models/blip.py', 'BLIP', []),
    (os.path.join(sd_path, '../k-diffusion'), 'k_diffusion/sampling.py', 'k_diffusion', ["atstart"]),
]

paths = {}

for d, must_exist, what, options in path_dirs:
    must_exist_path = os.path.abspath(os.path.join(script_path, d, must_exist))
    if not os.path.exists(must_exist_path):
        print(f"Warning: {what} not found at path {must_exist_path}", file=sys.stderr)
    else:
        d = os.path.abspath(d)
        if "atstart" in options:
            sys.path.insert(0, d)
        else:
            sys.path.append(d)
        paths[what] = d


class Prioritize:
    def __init__(self, name):
        self.name = name
        self.path = None

    def __enter__(self):
        self.path = sys.path.copy()
        sys.path = [paths[self.name]] + sys.path

    def __exit__(self, exc_type, exc_val, exc_tb):
        sys.path = self.path
        self.path = None
