from __future__ import annotations

class Result:

    def __init__(
        self,
        stdout: bytes | None,
        stderr: bytes | None,
        status: int,
        encoding: str = 'UTF-8',
        strip: bool = True,
        cmd: list[str] | None = None,
        wd: str | None = None,
    ) -> None:
        self.__stdout = stdout
        self.__stderr = stderr
        self.__status = status
        self.__encoding = encoding
        self.__strip = strip
        self.__cmd = cmd
        self.__wd = wd

    def __decode(self, stdxxx: bytes | None) -> str | None:
        if stdxxx is None:
            return None
        ret = stdxxx.decode(self.encoding)
        if self.strip:
            return ret.strip()
        return ret

    @property
    def status(self) -> int | None:
        return self.__status

    @property
    def encoding(self) -> str:
        return self.__encoding

    @encoding.setter
    def encoding(self, value: str) -> None:
        self.__encoding = value

    def __stdout_footprint(self, quote = False) -> str:
        if self.__stdout is None:
            ret = ''
        else:
            ret = self.stdout_str[:20]
        if quote:
            ret = f'"{ret}"'
        return ret

    def __repr__(self) -> str:
        ret = f'{self.__status}:'
        if self.status != 0:
            ret += f' err: {self.stderr_str_or_none}'
        else:
            ret += f' out: {self.__stdout_footprint(quote=True)}'
        return ret

    @property
    def strip(self) -> bool:
        return self.__strip

    @strip.setter
    def strip(self, value: bool) -> None:
        self.__strip = value

    @property
    def cmd(self) -> list[str] | None:
        return self.__cmd

    @cmd.setter
    def cmd(self, value: list[str]) -> None:
        self.__cmd = value

    @property
    def wd(self) -> str | None:
        return self.__wd

    @wd.setter
    def wd(self, value: str) -> None:
        self.__wd = value

    def matches_error(self, pattern: str) -> bool:
        if self.status == 0:
            return False
        err = self.stderr_str
        if err is None:
            return False
        import re
        return re.search(pattern, err) is not None

    def __summarize(self, cmd: list[str] | None, wd: str | None = None) -> str:
        from .util import pretty_cmd
        if cmd is None:
            cmd = self.__cmd
        call = ''
        if cmd is not None:
            if wd is None:
                wd = self.__wd
            call = f'"{pretty_cmd(cmd, wd)}" '
        ret = f'Command {call}has exited with status {self.__status}'
        call = pretty_cmd(cmd, wd)
        if self.status != 0:
            ret += f' -> stderr="{self.__stderr!r}"'
        else:
            if self.__stdout:
                ret += f' -> stdout has {len(self.__stdout)} bytes'
            else:
                ret += ' -> stdout = None'
        return ret

    def summarize(self, cmd: list[str] | None = None, wd: str | None = None) -> str:
        return self.__summarize(cmd, wd)

    @property
    def summary(self) -> str:
        return self.__summarize(None, None)

    @property
    def stdout(self) -> bytes:
        if self.__stdout is None:
            raise Exception(f'Result has no standard output stream: {self.summary}')
        return self.__stdout

    @property
    def stdout_or_none(self) -> bytes | None:
        return self.__stdout

    @property
    def stdout_str_or_none(self) -> str | None:
        return self.__decode(self.__stdout)

    @property
    def stdout_str(self) -> str:
        return self.stdout.decode(self.__encoding)

    @property
    def stderr(self) -> bytes:
        if self.__stderr is None:
            raise Exception(f'Result has no standard error stream: {self.summary}')
        return self.__stderr

    @property
    def stderr_or_none(self) -> bytes | None:
        return self.__stderr

    @property
    def stderr_str_or_none(self) -> str | None:
        return self.__decode(self.__stderr)

    @property
    def stderr_str(self) -> str:
        return self.stderr.decode(self.__encoding)