#!/usr/bin/env python3

r"""
See help text for details.
"""

import re
import subprocess
import sys

save_dir_path = sys.path.pop(0)

modules = [
    "gen_arg",
    "gen_print",
    "gen_valid",
    "gen_misc",
    "gen_cmd",
    "var_funcs",
]
for module in modules:
    exec("from " + module + " import *")

sys.path.insert(0, save_dir_path)

parser = argparse.ArgumentParser(
    usage="%(prog)s [OPTIONS]",
    description="%(prog)s will create a status file path name adhering to the"
    + " following pattern: <status dir path>/<prefix>.yymmdd."
    + "hhmmss.status.  It will then run the command string and"
    + " direct its stdout/stderr to the status file and optionally"
    + " to stdout.  This dual output streaming will be"
    + ' accomplished using either the "script" or the "tee"'
    + " program.  %(prog)s will also set and export environment"
    + ' variable "AUTO_STATUS_FILE_PATH" for the benefit of'
    + " child programs.",
    formatter_class=argparse.ArgumentDefaultsHelpFormatter,
    prefix_chars="-+",
)

parser.add_argument(
    "--status_dir_path",
    default="",
    help="The path to the directory where the status file will be created."
    + "%(default)s The default value is obtained from environment"
    + ' variable "${STATUS_DIR_PATH}", if set or from "${HOME}/'
    + 'status/".',
)

parser.add_argument(
    "--prefix",
    default="",
    help="The prefix for the generated file name.%(default)s The default value"
    + " is the command portion (i.e. the first token) of the command"
    + " string.",
)

parser.add_argument(
    "--status_file_name",
    default="",
    help="This allows the user to explicitly specify the status file name.  If"
    + " this argument is not used, %(prog)s composes a status file name."
    + '  If this argument is specified, the "--prefix" argument is'
    + " ignored.",
)

parser.add_argument(
    "--stdout",
    default=1,
    type=int,
    choices=[1, 0],
    help="Indicates that stdout/stderr from the command string execution"
    + " should be written to stdout as well as to the status file.",
)

parser.add_argument(
    "--tee",
    default=1,
    type=int,
    choices=[1, 0],
    help='Indicates that "tee" rather than "script" should be used.',
)

parser.add_argument(
    "--show_url",
    default=0,
    type=int,
    choices=[1, 0],
    help="Indicates that the status file path shown should be shown in the"
    + " form of a url.  If the output is to be viewed from a browser,"
    + " this may well become a clickable link.  Note that the"
    + ' get_file_path_url.py program must be found in the "PATH"'
    + " environment variable for this argument to be effective.",
)

parser.add_argument(
    "command_string",
    default="",
    nargs="*",
    help="The command string to be run.%(default)s",
)

# Populate stock_list with options we want.
stock_list = [("test_mode", 0), ("quiet", 1), ("debug", 0)]


def validate_parms():
    r"""
    Validate program parameters, etc.
    """

    global status_dir_path
    global command_string

    # Convert command_string from list to string.
    command_string = " ".join(command_string)
    set_pgm_arg(command_string)
    valid_value(command_string)

    if status_dir_path == "":
        status_dir_path = os.environ.get(
            "STATUS_DIR_PATH", os.environ.get("HOME") + "/status/"
        )
    status_dir_path = add_trailing_slash(status_dir_path)
    set_pgm_arg(status_dir_path)
    valid_dir_path(status_dir_path)

    global prefix
    global status_file_name
    if status_file_name == "":
        if prefix == "":
            prefix = command_string.split(" ")[0]
            # File extensions (e.g. ".sh", ".py", .etc), look clumsy in status file names.
            extension_regex = "\\.[a-zA-Z0-9]{1,3}$"
            prefix = re.sub(extension_regex, "", prefix)
            set_pgm_arg(prefix)
        status_file_name = prefix + "." + file_date_time_stamp() + ".status"
        set_pgm_arg(status_file_name)

    global status_file_path

    status_file_path = status_dir_path + status_file_name
    # Set environment variable for the benefit of child programs.
    os.environ["AUTO_STATUS_FILE_PATH"] = status_file_path
    # Set deprecated but still used AUTOSCRIPT_STATUS_FILE_PATH value.
    os.environ["AUTOSCRIPT_STATUS_FILE_PATH"] = status_file_path


def script_func(command_string, status_file_path):
    r"""
    Run the command string producing both stdout and file output via the script command and return the
    shell_rc.

    Description of argument(s):
    command_string                  The command string to be run.
    status_file_path                The path to the status file which is to contain a copy of all stdout.
    """

    cmd_buf = (
        "script -a -q -f "
        + status_file_path
        + " -c '"
        + escape_bash_quotes(command_string)
        + ' ; printf "\\n'
        + sprint_varx(ret_code_str, "${?}").rstrip("\n")
        + "\\n\"'"
    )
    qprint_issuing(cmd_buf)
    sub_proc = subprocess.Popen(cmd_buf, shell=True)
    sub_proc.communicate()
    shell_rc = sub_proc.returncode

    # Retrieve return code by examining ret_code_str output statement from status file.
    # Example text to be analyzed.
    # auto_status_file_ret_code:                        127
    cmd_buf = (
        "tail -n 10 "
        + status_file_path
        + ' | egrep -a "'
        + ret_code_str
        + ':[ ]+"'
    )
    rc, output = shell_cmd(cmd_buf)
    key, value = parse_key_value(output)
    shell_rc = int(value)

    return shell_rc


def tee_func(command_string, status_file_path):
    r"""
    Run the command string producing both stdout and file output via the tee command and return the shell_rc.

    Description of argument(s):
    command_string                  The command string to be run.
    status_file_path                The path to the status file which is to contain a copy of all stdout.
    """

    cmd_buf = (
        "set -o pipefail ; "
        + command_string
        + " 2>&1 | tee -a "
        + status_file_path
    )
    qprint_issuing(cmd_buf)
    sub_proc = subprocess.Popen(cmd_buf, shell=True)
    sub_proc.communicate()
    shell_rc = sub_proc.returncode

    print
    print_varx(ret_code_str, shell_rc)
    with open(status_file_path, "a") as status_file:
        # Append ret code string and status_file_path to end of status file.
        status_file.write("\n" + sprint_varx(ret_code_str, shell_rc))

    return shell_rc


def main():
    gen_setup()

    set_term_options(
        term_requests={"pgm_names": [command_string.split(" ")[0]]}
    )

    global ret_code_str
    ret_code_str = re.sub("\\.py$", "", pgm_name) + "_ret_code"

    global show_url
    if show_url:
        shell_rc, output = shell_cmd("which get_file_path_url.py", show_err=0)
        if shell_rc != 0:
            show_url = 0
            set_pgm_arg(show_url)
        else:
            shell_rc, status_file_url = shell_cmd(
                "get_file_path_url.py " + status_file_path
            )
            status_file_url = status_file_url.rstrip("\n")

    # Print status file path/url to stdout and to status file.
    with open(status_file_path, "w+") as status_file:
        if show_url:
            print_var(status_file_url)
            status_file.write(sprint_var(status_file_url))
        else:
            print_var(status_file_path)
            status_file.write(sprint_var(status_file_path))

    if stdout:
        if tee:
            shell_rc = tee_func(command_string, status_file_path)
        else:
            shell_rc = script_func(command_string, status_file_path)
        if show_url:
            print_var(status_file_url)
        else:
            print_var(status_file_path)
    else:
        cmd_buf = command_string + " >> " + status_file_path + " 2>&1"
        shell_rc, output = shell_cmd(cmd_buf, show_err=0)
        with open(status_file_path, "a") as status_file:
            # Append ret code string and status_file_path to end of status
            # file.
            status_file.write("\n" + sprint_varx(ret_code_str, shell_rc))

    # Append status_file_path print statement to end of status file.
    with open(status_file_path, "a") as status_file:
        if show_url:
            status_file.write(sprint_var(status_file_url))
        else:
            status_file.write(sprint_var(status_file_path))
    exit(shell_rc)


main()