# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.

from enum import Enum
from typing import List

import pkg_resources
from pydantic import BaseModel

from termcolor import cprint

from llama_stack.distribution.utils.exec import run_with_pty

from llama_stack.distribution.datatypes import *  # noqa: F403
from pathlib import Path

from llama_stack.distribution.distribution import get_provider_registry

from llama_stack.distribution.utils.config_dirs import BUILDS_BASE_DIR


# These are the dependencies needed by the distribution server.
# `llama-stack` is automatically installed by the installation script.
SERVER_DEPENDENCIES = [
    "aiosqlite",
    "fastapi",
    "fire",
    "httpx",
    "uvicorn",
]


class ImageType(Enum):
    docker = "docker"
    conda = "conda"


class ApiInput(BaseModel):
    api: Api
    provider: str


def get_provider_dependencies(
    config_providers: Dict[str, List[Provider]]
) -> tuple[list[str], list[str]]:
    """Get normal and special dependencies from provider configuration."""
    all_providers = get_provider_registry()
    deps = []

    for api_str, provider_or_providers in config_providers.items():
        providers_for_api = all_providers[Api(api_str)]

        providers = (
            provider_or_providers
            if isinstance(provider_or_providers, list)
            else [provider_or_providers]
        )

        for provider in providers:
            # Providers from BuildConfig and RunConfig are subtly different – not great
            provider_type = (
                provider if isinstance(provider, str) else provider.provider_type
            )

            if provider_type not in providers_for_api:
                raise ValueError(
                    f"Provider `{provider}` is not available for API `{api_str}`"
                )

            provider_spec = providers_for_api[provider_type]
            deps.extend(provider_spec.pip_packages)
            if provider_spec.docker_image:
                raise ValueError("A stack's dependencies cannot have a docker image")

    normal_deps = []
    special_deps = []
    for package in deps:
        if "--no-deps" in package or "--index-url" in package:
            special_deps.append(package)
        else:
            normal_deps.append(package)

    return list(set(normal_deps)), list(set(special_deps))


def print_pip_install_help(providers: Dict[str, List[Provider]]):
    normal_deps, special_deps = get_provider_dependencies(providers)

    print(
        f"Please install needed dependencies using the following commands:\n\n\tpip install {' '.join(normal_deps)}"
    )
    for special_dep in special_deps:
        print(f"\tpip install {special_dep}")
    print()


def build_image(build_config: BuildConfig, build_file_path: Path):
    docker_image = build_config.distribution_spec.docker_image or "python:3.10-slim"

    normal_deps, special_deps = get_provider_dependencies(
        build_config.distribution_spec.providers
    )
    normal_deps += SERVER_DEPENDENCIES

    if build_config.image_type == ImageType.docker.value:
        script = pkg_resources.resource_filename(
            "llama_stack", "distribution/build_container.sh"
        )
        args = [
            script,
            build_config.name,
            docker_image,
            str(build_file_path),
            str(BUILDS_BASE_DIR / ImageType.docker.value),
            " ".join(normal_deps),
        ]
    else:
        script = pkg_resources.resource_filename(
            "llama_stack", "distribution/build_conda_env.sh"
        )
        args = [
            script,
            build_config.name,
            str(build_file_path),
            " ".join(normal_deps),
        ]

    if special_deps:
        args.append("#".join(special_deps))

    return_code = run_with_pty(args)
    if return_code != 0:
        cprint(
            f"Failed to build target {build_config.name} with return code {return_code}",
            color="red",
        )

    return return_code