#!/usr/bin/env python3

r"""
This module provides functions which are useful for running plug-ins from a robot program.
"""

import sys
import subprocess
from robot.libraries.BuiltIn import BuiltIn
import os
import tempfile

import gen_print as gp
import gen_misc as gm
import gen_cmd as gc


def rvalidate_plug_ins(plug_in_dir_paths,
                       quiet=1):
    r"""
    Call the external validate_plug_ins.py program which validates the plug-in dir paths given to it.  Return
    a list containing a normalized path for each plug-in selected.

    Description of arguments:
    plug_in_dir_paths               A colon-separated list of plug-in directory paths.
    quiet                           If quiet is set to 1, this function will NOT write status messages to
                                    stdout.
    """

    cmd_buf = "validate_plug_ins.py \"" + plug_in_dir_paths + "\""
    rc, out_buf = gc.shell_cmd(cmd_buf, print_output=0)
    if rc != 0:
        BuiltIn().fail(gp.sprint_error("Validate plug ins call failed.  See"
                                       + " stderr text for details.\n"))

    # plug_in_packages_list = out_buf.split("\n")
    plug_in_packages_list = list(filter(None, out_buf.split("\n")))
    if len(plug_in_packages_list) == 1 and plug_in_packages_list[0] == "":
        return []

    return plug_in_packages_list


def rprocess_plug_in_packages(plug_in_packages_list=None,
                              call_point="setup",
                              shell_rc="0x00000000",
                              stop_on_plug_in_failure=1,
                              stop_on_non_zero_rc=0,
                              release_type="obmc",
                              quiet=None,
                              debug=None,
                              return_history=False):
    r"""
    Call the external process_plug_in_packages.py to process the plug-in packages.  Return the following:
    rc                              The return code - 0 = PASS, 1 = FAIL.
    shell_rc                        The shell return code returned by process_plug_in_packages.py.
    failed_plug_in_name             The failed plug in name (if any).

    Description of arguments:
    plug_in_packages_list           A python list of plug-in directory paths.
    call_point                      The call point program to be called for each plug-in package (e.g.
                                    post_boot).  This name should not include the "cp_" prefix.
    shell_rc                        The user may supply a value other than zero to indicate an acceptable
                                    non-zero return code.  For example, if this value equals 0x00000200, it
                                    means that for each plug-in call point that runs, a 0x00000200 will not
                                    be counted as a failure.
    stop_on_plug_in_failure         If this parameter is set to 1, this program will stop and return non-zero
                                    if the call point program from any plug-in directory fails.  Conversely,
                                    if it is set to false, this program will run the call point program from
                                    each and every plug-in directory regardless of their return values.
                                    Typical example cases where you'd want to run all plug-in call points
                                    regardless of success or failure would be "cleanup" or "ffdc" call points.
    stop_on_non_zero_rc             If this parm is set to 1 and a plug-in call point program returns a valid
                                    non-zero return code (see "shell_rc" parm above), this program will stop
                                    processing and return 0 (success).  Since this constitutes a successful
                                    exit, this would normally be used where the caller wishes to stop
                                    processing if one of the plug-in directory call point programs returns a
                                    special value indicating that some special case has been found.  An
                                    example might be in calling some kind of "check_errl" call point program.
                                    Such a call point program might return a 2 (i.e. 0x00000200) to indicate
                                    that a given error log entry was found in an "ignore" list and is
                                    therefore to be ignored.  That being the case, no other "check_errl" call
                                    point program would need to be called.
    release_type                    The type of release being tested (e.g. "obmc", "op", "fips").  This
                                    influences which integrated plug-ins are selected.
    quiet                           If quiet is set to 1, this function will NOT write status messages to
                                    stdout.  This will default to the global quiet program parm or to 0.
    debug                           If this parameter is set to 1, this function will print additional debug
                                    information.  This is mainly to be used by the developer of this
                                    function.  This will default to the global quiet program parm or to 0.
    return_history                  In addition to rc, shell_rc and failed_plug_in_name, return a list
                                    containing historical output that looks like the following:

    history:
      history[0]:                   #(CDT) 2018/10/30 12:25:49 - Running OBMC_Sample/cp_post_stack
    """

    rc = 0

    plug_in_packages_list = gp.get_var_value(plug_in_packages_list, [])

    # If there are no plug-in packages to process, return successfully.
    if len(plug_in_packages_list) == 0:
        if return_history:
            return 0, 0, "", []
        else:
            return 0, 0, ""

    quiet = int(gp.get_var_value(quiet, 0))
    debug = int(gp.get_var_value(debug, 0))

    # Create string from list.
    plug_in_dir_paths = ':'.join(plug_in_packages_list)

    temp = tempfile.NamedTemporaryFile()
    temp_file_path = temp.name
    temp2 = tempfile.NamedTemporaryFile()
    temp_properties_file_path = temp2.name

    if debug:
        os.environ["PERF_TRACE"] = "1"
        debug_string = " --quiet=0"
    else:
        debug_string = ""

    loc_shell_rc = 0

    sub_cmd_buf = "process_plug_in_packages.py" + debug_string +\
                  " --call_point=" + call_point + " --allow_shell_rc=" +\
                  str(shell_rc) + " --stop_on_plug_in_failure=" +\
                  str(stop_on_plug_in_failure) + " --stop_on_non_zero_rc=" +\
                  str(stop_on_non_zero_rc) + " " + plug_in_dir_paths
    if quiet:
        cmd_buf = sub_cmd_buf + " > " + temp_file_path + " 2>&1"
    else:
        cmd_buf = "set -o pipefail ; " + sub_cmd_buf + " 2>&1 | tee " +\
                  temp_file_path
        if debug:
            gp.print_issuing(cmd_buf)
        else:
            gp.print_timen("Processing " + call_point
                           + " call point programs.")

    sub_proc = subprocess.Popen(cmd_buf, shell=True, executable='/bin/bash')
    sub_proc.communicate()
    proc_plug_pkg_rc = sub_proc.returncode

    if return_history:
        # Get the "Running" statements from the output.
        regex = " Running [^/]+/cp_"
        cmd_buf = "egrep '" + regex + "' " + temp_file_path
        _, history = gc.shell_cmd(cmd_buf, quiet=(not debug), print_output=0,
                                  show_err=0, ignore_err=1)
        history = [x + "\n" for x in filter(None, history.split("\n"))]
    else:
        history = []

    # As process_plug_in_packages.py help text states, it will print the values of failed_plug_in_name and
    # shell_rc in the following format:
    # failed_plug_in_name:               <failed plug-in value, if any>
    # shell_rc:                          <shell return code value of last call point program>

    # We want to obtain those values from the output.  To make the task simpler, we'll start by grepping the
    # output for lines that might fit such a format:
    # A valid bash variable against the left margin followed by...
    # - A colon followed by...
    # - Zero or more spaces
    bash_var_regex = "[_[:alpha:]][_[:alnum:]]*"
    regex = "^" + bash_var_regex + ":[ ]*"
    cmd_buf = "egrep '" + regex + "' " + temp_file_path + " > " +\
              temp_properties_file_path
    gp.dprint_issuing(cmd_buf)
    grep_rc = os.system(cmd_buf)

    # Next we call my_parm_file to create a properties dictionary.
    properties = gm.my_parm_file(temp_properties_file_path)

    # Finally, we access the 2 values that we need.
    shell_rc = int(properties.get('shell_rc', '0x0000000000000000'), 16)
    failed_plug_in_name = properties.get('failed_plug_in_name', '')

    if proc_plug_pkg_rc != 0:
        if quiet:
            os.system("cat " + temp_file_path + " >&2")
        if grep_rc != 0:
            gp.print_var(grep_rc, gp.hexa())
        gp.print_var(proc_plug_pkg_rc, gp.hexa())
        gp.print_timen("Re-cap of plug-in failures:")
        gc.cmd_fnc_u("egrep -A 1 '^failed_plug_in_name:[ ]+' "
                     + temp_properties_file_path + " | egrep -v '^\\--'",
                     quiet=1, show_err=0)
        rc = 1

    if return_history:
        return rc, shell_rc, failed_plug_in_name, history
    else:
        return rc, shell_rc, failed_plug_in_name