# Copyright (C) 2021-2023, Mindee.

# This program is licensed under the Apache License 2.0.
# See LICENSE or go to <https://opensource.org/licenses/Apache-2.0> for full license details.

# Adapted from https://github.com/pytorch/torch/blob/master/torch/nn/modules/module.py

from typing import List

__all__ = ["NestedObject"]


def _addindent(s_, num_spaces):
    s = s_.split("\n")
    # don't do anything for single-line stuff
    if len(s) == 1:
        return s_
    first = s.pop(0)
    s = [(num_spaces * " ") + line for line in s]
    s = "\n".join(s)
    s = first + "\n" + s
    return s


class NestedObject:
    _children_names: List[str]

    def extra_repr(self) -> str:
        return ""

    def __repr__(self):
        # We treat the extra repr like the sub-object, one item per line
        extra_lines = []
        extra_repr = self.extra_repr()
        # empty string will be split into list ['']
        if extra_repr:
            extra_lines = extra_repr.split("\n")
        child_lines = []
        if hasattr(self, "_children_names"):
            for key in self._children_names:
                child = getattr(self, key)
                if isinstance(child, list) and len(child) > 0:
                    child_str = ",\n".join([repr(subchild) for subchild in child])
                    if len(child) > 1:
                        child_str = _addindent(f"\n{child_str},", 2) + "\n"
                    child_str = f"[{child_str}]"
                else:
                    child_str = repr(child)
                child_str = _addindent(child_str, 2)
                child_lines.append("(" + key + "): " + child_str)
        lines = extra_lines + child_lines

        main_str = self.__class__.__name__ + "("
        if lines:
            # simple one-liner info, which most builtin Modules will use
            if len(extra_lines) == 1 and not child_lines:
                main_str += extra_lines[0]
            else:
                main_str += "\n  " + "\n  ".join(lines) + "\n"

        main_str += ")"
        return main_str
