#!/usr/bin/env python3
#
#   Copyright 2016 - The Android Open Source Project
#
#   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.

from acts.libs.proc import job

import logging
from acts import error


class FastbootError(error.ActsError):
    """Raised when there is an error in fastboot operations."""

    def __init__(self, cmd, stdout, stderr, ret_code):
        super().__init__()
        self.cmd = cmd
        self.stdout = stdout
        self.stderr = stderr
        self.ret_code = ret_code

    def __str__(self):
        return ("Error executing fastboot cmd '%s'. ret: %d, stdout: %s,"
                " stderr: %s") % (self.cmd, self.ret_code, self.stdout,
                                  self.stderr)


class FastbootProxy():
    """Proxy class for fastboot.

    For syntactic reasons, the '-' in fastboot commands need to be replaced
    with '_'. Can directly execute fastboot commands on an object:
    >> fb = FastbootProxy(<serial>)
    >> fb.devices() # will return the console output of "fastboot devices".
    """

    def __init__(self, serial="", ssh_connection=None):
        self.serial = serial
        if serial:
            self.fastboot_str = "fastboot -s {}".format(serial)
        else:
            self.fastboot_str = "fastboot"
        self.ssh_connection = ssh_connection

    def _exec_fastboot_cmd(self,
                           name,
                           arg_str,
                           ignore_status=False,
                           timeout=60):
        command = ' '.join((self.fastboot_str, name, arg_str))
        if self.ssh_connection:
            result = self.connection.run(command,
                                         ignore_status=True,
                                         timeout=timeout)
        else:
            result = job.run(command, ignore_status=True, timeout=timeout)
        ret, out, err = result.exit_status, result.stdout, result.stderr
        # TODO: This is only a temporary workaround for b/34815412.
        # fastboot getvar outputs to stderr instead of stdout
        if "getvar" in command:
            out = err
        if ret == 0 or ignore_status:
            return out
        else:
            raise FastbootError(
                cmd=command, stdout=out, stderr=err, ret_code=ret)

    def args(self, *args, **kwargs):
        return job.run(' '.join((self.fastboot_str, ) + args), **kwargs).stdout

    def __getattr__(self, name):
        def fastboot_call(*args, **kwargs):
            clean_name = name.replace('_', '-')
            arg_str = ' '.join(str(elem) for elem in args)
            return self._exec_fastboot_cmd(clean_name, arg_str, **kwargs)

        return fastboot_call