# this scripts installs necessary requirements and launches main program in webui.py
import subprocess
import os
import sys
import importlib.util
import shlex
import platform
import json

from modules import cmd_args
from modules.paths_internal import script_path, extensions_dir

commandline_args = os.environ.get('COMMANDLINE_ARGS', "")
sys.argv += shlex.split(commandline_args)

args, _ = cmd_args.parser.parse_known_args()

python = sys.executable
git = os.environ.get('GIT', "git")
index_url = os.environ.get('INDEX_URL', "")
stored_commit_hash = None
skip_install = False
dir_repos = "repositories"

if 'GRADIO_ANALYTICS_ENABLED' not in os.environ:
    os.environ['GRADIO_ANALYTICS_ENABLED'] = 'False'


def check_python_version():
    is_windows = platform.system() == "Windows"
    major = sys.version_info.major
    minor = sys.version_info.minor
    micro = sys.version_info.micro

    if is_windows:
        supported_minors = [10]
    else:
        supported_minors = [9, 10, 11]

    if not (major == 3 and minor in supported_minors):
        import modules.errors

        modules.errors.print_error_explanation(f"Incompatible Python version: {major}.{minor}.{micro} required 3.9-3.11")


def commit_hash():
    global stored_commit_hash

    if stored_commit_hash is not None:
        return stored_commit_hash

    try:
        stored_commit_hash = run(f"{git} rev-parse HEAD").strip()
    except Exception:
        stored_commit_hash = "<none>"

    return stored_commit_hash


def run(command, desc=None, errdesc=None, custom_env=None, live=False):
    if desc is not None:
        print(desc)

    if live:
        result = subprocess.run(command, shell=True, env=os.environ if custom_env is None else custom_env)
        if result.returncode != 0:
            raise RuntimeError(f"""{errdesc or 'Error running command'}.
Command: {command}
Error code: {result.returncode}""")

        return ""

    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, env=os.environ if custom_env is None else custom_env)

    if result.returncode != 0:

        message = f"""{errdesc or 'Error running command'}.
Command: {command}
Error code: {result.returncode}
stdout: {result.stdout.decode(encoding="utf8", errors="ignore") if len(result.stdout)>0 else '<empty>'}
stderr: {result.stderr.decode(encoding="utf8", errors="ignore") if len(result.stderr)>0 else '<empty>'}
"""
        raise RuntimeError(message)

    return result.stdout.decode(encoding="utf8", errors="ignore")


def check_run(command):
    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
    return result.returncode == 0


def is_installed(package):
    try:
        spec = importlib.util.find_spec(package)
    except ModuleNotFoundError:
        return False

    return spec is not None


def repo_dir(name):
    return os.path.join(script_path, dir_repos, name)


def run_python(code, desc=None, errdesc=None):
    return run(f'"{python}" -c "{code}"', desc, errdesc)


def run_pip(args, desc=None):
    if skip_install:
        return

    index_url_line = f' --index-url {index_url}' if index_url != '' else ''
    return run(f'"{python}" -m pip {args} --prefer-binary{index_url_line}', desc=f"Installing {desc}", errdesc=f"Couldn't install {desc}")


def check_run_python(code):
    return check_run(f'"{python}" -c "{code}"')


def git_clone(url, dir, name, commithash=None):
    # TODO clone into temporary dir and move if successful

    if os.path.exists(dir):
        if commithash is None:
            return

        current_hash = run(f'"{git}" -C "{dir}" rev-parse HEAD', None, f"Couldn't determine {name}'s hash: {commithash}").strip()
        if current_hash == commithash:
            return

        run(f'"{git}" -C "{dir}" fetch', f"Fetching updates for {name}...", f"Couldn't fetch {name}")
        run(f'"{git}" -C "{dir}" checkout {commithash}', f"Checking out commit for {name} with hash: {commithash}...", f"Couldn't checkout commit {commithash} for {name}")
        return

    run(f'"{git}" clone "{url}" "{dir}"', f"Cloning {name} into {dir}...", f"Couldn't clone {name}")

    if commithash is not None:
        run(f'"{git}" -C "{dir}" checkout {commithash}', None, "Couldn't checkout {name}'s hash: {commithash}")


def git_pull_recursive(dir):
    for subdir, _, _ in os.walk(dir):
        if os.path.exists(os.path.join(subdir, '.git')):
            try:
                output = subprocess.check_output([git, '-C', subdir, 'pull', '--autostash'])
                print(f"Pulled changes for repository in '{subdir}':\n{output.decode('utf-8').strip()}\n")
            except subprocess.CalledProcessError as e:
                print(f"Couldn't perform 'git pull' on repository in '{subdir}':\n{e.output.decode('utf-8').strip()}\n")


def version_check(commit):
    try:
        import requests
        commits = requests.get('https://api.github.com/repos/vladmandic/automatic/branches/master').json()
        if commit != "<none>" and commits['commit']['sha'] != commit:
            print("--------------------------------------------------------")
            print("| You are not up to date with the most recent release. |")
            print("| Consider running `git pull` to update.               |")
            print("--------------------------------------------------------")
        elif commits['commit']['sha'] == commit:
            print("You are up to date with the most recent release.")
        else:
            print("Not a git clone, can't perform version check.")
    except Exception as e:
        print("version check failed", e)


def run_extension_installer(extension_dir):
    path_installer = os.path.join(extension_dir, "install.py")
    if not os.path.isfile(path_installer):
        return

    try:
        env = os.environ.copy()
        env['PYTHONPATH'] = os.path.abspath(".")

        stdout = run(f'"{python}" "{path_installer}"', errdesc=f"Error running install.py for extension {extension_dir}", custom_env=env)
        if stdout is not None:
            print(stdout)
    except Exception as e:
        print(e, file=sys.stderr)


def list_extensions(settings_file):
    settings = {}

    try:
        if os.path.isfile(settings_file):
            with open(settings_file, "r", encoding="utf8") as file:
                settings = json.load(file)
    except Exception as e:
        print(e, file=sys.stderr)

    disabled_extensions = set(settings.get('disabled_extensions', []))
    disable_all_extensions = settings.get('disable_all_extensions', 'none')

    if disable_all_extensions != 'none':
        return []

    return [x for x in os.listdir(extensions_dir) if x not in disabled_extensions]


def run_extensions_installers(settings_file):
    if not os.path.isdir(extensions_dir):
        return

    for dirname_extension in list_extensions(settings_file):
        run_extension_installer(os.path.join(extensions_dir, dirname_extension))


def prepare_environment():
    global skip_install

    torch_command = os.environ.get('TORCH_COMMAND', "pip install torch torchaudio torchvision --extra-index-url https://download.pytorch.org/whl/cu118")
    requirements_file = os.environ.get('REQS_FILE', "requirements_versions.txt")

    xformers_package = os.environ.get('XFORMERS_PACKAGE', 'xformers==0.0.17')
    gfpgan_package = os.environ.get('GFPGAN_PACKAGE', "git+https://github.com/TencentARC/GFPGAN.git@8d2447a2d918f8eba5a4a01463fd48e45126a379")
    clip_package = os.environ.get('CLIP_PACKAGE', "git+https://github.com/openai/CLIP.git@d50d76daa670286dd6cacf3bcd80b5e4823fc8e1")
    openclip_package = os.environ.get('OPENCLIP_PACKAGE', "git+https://github.com/mlfoundations/open_clip.git@bb6e834e9c70d9c27d0dc3ecedeebeaeb1ffad6b")

    stable_diffusion_repo = os.environ.get('STABLE_DIFFUSION_REPO', "https://github.com/Stability-AI/stablediffusion.git")
    taming_transformers_repo = os.environ.get('TAMING_TRANSFORMERS_REPO', "https://github.com/CompVis/taming-transformers.git")
    k_diffusion_repo = os.environ.get('K_DIFFUSION_REPO', 'https://github.com/crowsonkb/k-diffusion.git')
    codeformer_repo = os.environ.get('CODEFORMER_REPO', 'https://github.com/sczhou/CodeFormer.git')
    blip_repo = os.environ.get('BLIP_REPO', 'https://github.com/salesforce/BLIP.git')

    stable_diffusion_commit_hash = os.environ.get('STABLE_DIFFUSION_COMMIT_HASH', "cf1d67a6fd5ea1aa600c4df58e5b47da45f6bdbf")
    taming_transformers_commit_hash = os.environ.get('TAMING_TRANSFORMERS_COMMIT_HASH', "3ba01b241669f5ade541ce990f7650a3b8f65318")
    k_diffusion_commit_hash = os.environ.get('K_DIFFUSION_COMMIT_HASH', "b43db16749d51055f813255eea2fdf1def801919")
    codeformer_commit_hash = os.environ.get('CODEFORMER_COMMIT_HASH', "c5b4593074ba6214284d6acd5f1719b6c5d739af")
    blip_commit_hash = os.environ.get('BLIP_COMMIT_HASH', "48211a1594f1321b00f14c9f7a5b4813144b2fb9")

    if not args.skip_python_version_check:
        check_python_version()

    commit = commit_hash()

    if args.reinstall_torch or not is_installed("torch") or not is_installed("torchvision"):
        run(f'"{python}" -m {torch_command}', "Installing torch and torchvision", "Couldn't install torch", live=True)

    if not args.skip_torch_cuda_test:
        run_python("import torch; assert torch.cuda.is_available(), 'Torch is not able to use GPU; add --skip-torch-cuda-test to COMMANDLINE_ARGS variable to disable this check'")

    if not is_installed("gfpgan"):
        run_pip(f"install {gfpgan_package}", "gfpgan")

    if not is_installed("clip"):
        run_pip(f"install {clip_package}", "clip")

    if not is_installed("open_clip"):
        run_pip(f"install {openclip_package}", "open_clip")

    if not is_installed("xformers") and args.reinstall_xformers and args.xformers:
        if platform.system() == "Windows":
            if platform.python_version().startswith("3.10"):
                run_pip(f"install -U -I --no-deps {xformers_package}", "xformers")
            else:
                print("Installation of xformers is not supported in this version of Python.")
                if not is_installed("xformers"):
                    exit(0)
        elif platform.system() == "Linux":
            run_pip(f"install {xformers_package}", "xformers")

    if not is_installed("pyngrok") and args.ngrok:
        run_pip("install pyngrok", "ngrok")

    os.makedirs(os.path.join(script_path, dir_repos), exist_ok=True)

    git_clone(stable_diffusion_repo, repo_dir('stable-diffusion-stability-ai'), "Stable Diffusion", stable_diffusion_commit_hash)
    git_clone(taming_transformers_repo, repo_dir('taming-transformers'), "Taming Transformers", taming_transformers_commit_hash)
    git_clone(k_diffusion_repo, repo_dir('k-diffusion'), "K-diffusion", k_diffusion_commit_hash)
    git_clone(codeformer_repo, repo_dir('CodeFormer'), "CodeFormer", codeformer_commit_hash)
    git_clone(blip_repo, repo_dir('BLIP'), "BLIP", blip_commit_hash)

    if not is_installed("lpips"):
        run_pip(f"install -r \"{os.path.join(repo_dir('CodeFormer'), 'requirements.txt')}\"", "requirements for CodeFormer")

    if not os.path.isfile(requirements_file):
        requirements_file = os.path.join(script_path, requirements_file)
    run_pip(f"install -r \"{requirements_file}\"", "requirements for Web UI")

    run_extensions_installers(settings_file=args.ui_settings_file)

    if args.update_check:
        version_check(commit)

    if args.update_all_extensions:
        git_pull_recursive(extensions_dir)
    
    if "--exit" in sys.argv:
        print("Exiting because of --exit argument")
        exit(0)


def start():
    print(f"Launching {'API server' if '--nowebui' in sys.argv else 'Web UI'} with arguments: {' '.join(sys.argv[1:])}")
    import webui
    if '--nowebui' in sys.argv:
        webui.api_only()
    else:
        webui.webui()


if __name__ == "__main__":
    prepare_environment()
    start()