#
# Copyright(c) 2019 Intel Corporation
# SPDX-License-Identifier: BSD-3-Clause-Clear
#

from ctypes import string_at


def print_buffer(
    buf,
    length,
    offset=0,
    width=16,
    ignore=0,
    stop_after_count_ignored=0,
    print_fcn=print,
):
    end = int(offset) + int(length)
    offset = int(offset)
    ignored_lines = 0
    buf = string_at(buf, length)
    whole_buffer_ignored = True
    stop_after_count_ignored = int(stop_after_count_ignored / width)

    for addr in range(offset, end, width):
        cur_line = buf[addr : min(end, addr + width)]
        byteline = ""
        asciiline = ""
        if not any(x != ignore for x in cur_line):
            if (
                stop_after_count_ignored
                and ignored_lines > stop_after_count_ignored
            ):
                print_fcn(
                    "<{} bytes of '0x{:02X}' encountered, stopping>".format(
                        stop_after_count_ignored * width, ignore
                    )
                )
                return
            ignored_lines += 1
            continue

        if ignored_lines:
            print_fcn(
                "<{} of '0x{:02X}' bytes omitted>".format(
                    ignored_lines * width, ignore
                )
            )
            ignored_lines = 0

        for byte in cur_line:
            byte = int(byte)
            byteline += "{:02X} ".format(byte)
            if 31 < byte < 126:
                char = chr(byte)
            else:
                char = "."
            asciiline += char

        print_fcn("0x{:08X}\t{}\t{}".format(addr, byteline, asciiline))
        whole_buffer_ignored = False

    if whole_buffer_ignored:
        print_fcn("<whole buffer ignored>")
    elif ignored_lines:
        print_fcn("<'0x{:02X}' until end>".format(ignore))


class Size:
    _KiB = 1024
    _MiB = _KiB * 1024
    _GiB = _MiB * 1024
    _TiB = _GiB * 1024
    _SECTOR_SIZE = 512

    def __init__(self, b: int, sector_aligned: bool = False):
        if sector_aligned:
            self.bytes = int(
                ((b + self._SECTOR_SIZE - 1) // self._SECTOR_SIZE)
                * self._SECTOR_SIZE
            )
        else:
            self.bytes = int(b)

    def __int__(self):
        return self.bytes

    def __index__(self):
        return self.bytes

    @classmethod
    def from_B(cls, value, sector_aligned=False):
        return cls(value, sector_aligned)

    @classmethod
    def from_KiB(cls, value, sector_aligned=False):
        return cls(value * cls._KiB, sector_aligned)

    @classmethod
    def from_MiB(cls, value, sector_aligned=False):
        return cls(value * cls._MiB, sector_aligned)

    @classmethod
    def from_GiB(cls, value, sector_aligned=False):
        return cls(value * cls._GiB, sector_aligned)

    @classmethod
    def from_TiB(cls, value, sector_aligned=False):
        return cls(value * cls._TiB, sector_aligned)

    @classmethod
    def from_sector(cls, value):
        return cls(value * cls._SECTOR_SIZE)

    @property
    def B(self):
        return self.bytes

    @property
    def KiB(self):
        return self.bytes / self._KiB

    @property
    def MiB(self):
        return self.bytes / self._MiB

    @property
    def GiB(self):
        return self.bytes / self._GiB

    @property
    def TiB(self):
        return self.bytes / self._TiB

    @property
    def sectors(self):
        return self.bytes // self._SECTOR_SIZE

    def __str__(self):
        if self.bytes < self._KiB:
            return "{} B".format(self.B)
        elif self.bytes < self._MiB:
            return "{} KiB".format(self.KiB)
        elif self.bytes < self._GiB:
            return "{} MiB".format(self.MiB)
        elif self.bytes < self._TiB:
            return "{} GiB".format(self.GiB)
        else:
            return "{} TiB".format(self.TiB)


def print_structure(struct, indent=0):
    print(struct)
    for field, field_type in struct._fields_:
        value = getattr(struct, field)
        if hasattr(value, "_fields_"):
            print("{}{: <20} :".format("   " * indent, field))
            print_structure(value, indent=indent + 1)
            continue

        print("{}{: <20} : {}".format("   " * indent, field, value))


def struct_to_dict(struct):
    d = {}
    for field, field_type in struct._fields_:
        value = getattr(struct, field)
        if hasattr(value, "_fields_"):
            d[field] = struct_to_dict(value)
            continue
        d[field] = value

    return d