# Copyright The Lightning AI team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Diagnose your system and show basic information.

This server mainly to get detail info for better bug reporting.
"""

import os
import platform
import sys

import pkg_resources
import torch

sys.path += [os.path.abspath(".."), os.path.abspath("")]


LEVEL_OFFSET = "\t"
KEY_PADDING = 20


def info_system() -> dict:
    return {
        "OS": platform.system(),
        "architecture": platform.architecture(),
        "version": platform.version(),
        "processor": platform.processor(),
        "python": platform.python_version(),
    }


def info_cuda() -> dict:
    return {
        "GPU": [torch.cuda.get_device_name(i) for i in range(torch.cuda.device_count())] or None,
        "available": torch.cuda.is_available(),
        "version": torch.version.cuda,
    }


def info_packages() -> dict:
    """Get name and version of all installed packages."""
    packages = {}
    for dist in pkg_resources.working_set:
        package = dist.as_requirement()
        packages[package.key] = package.specs[0][1]
    return packages


def nice_print(details: dict, level: int = 0) -> list:
    lines = []
    for k in sorted(details):
        key = f"* {k}:" if level == 0 else f"- {k}:"
        if isinstance(details[k], dict):
            lines += [level * LEVEL_OFFSET + key]
            lines += nice_print(details[k], level + 1)
        elif isinstance(details[k], (set, list, tuple)):
            lines += [level * LEVEL_OFFSET + key]
            lines += [(level + 1) * LEVEL_OFFSET + "- " + v for v in details[k]]
        else:
            template = "{:%is} {}" % KEY_PADDING
            key_val = template.format(key, details[k])
            lines += [(level * LEVEL_OFFSET) + key_val]
    return lines


def main() -> None:
    details = {"System": info_system(), "CUDA": info_cuda(), "Packages": info_packages()}
    details["Lightning"] = {k: v for k, v in details["Packages"].items() if "torch" in k or "lightning" in k}
    lines = nice_print(details)
    text = os.linesep.join(lines)
    print(text)


if __name__ == "__main__":
    main()