#!/usr/bin/env python3

"""Mail to Dan."""

import os
import sys

sys.path.insert(0, os.path.expanduser("~/lib"))
sys.path.insert(0, "/usr/local/lib")

import mailer as mailer_mod  # noqa: ignore-E402


def usage(retval):
    """Output a usage message."""
    if retval == 0:
        write = sys.stderr.write
    else:
        write = sys.stderr.write
    write("Usage: %s\n" % sys.argv[0])
    write("    -s subject\n")
    write("    -a account\n")
    write("    -z\n")
    write("    -Z /ignore/file\n")
    write("    -f from_address\n")
    write("    -t to_address\n")
    write("    --html\n")
    write("    -h\n")
    write("    message body on stdin\n")
    sys.exit(retval)


class Options:
    """Hold and vet command line options."""

    def __init__(self):
        """Init."""
        self.subject = "No subject given"
        self.only_if_nonzero = False
        self.from_address = "strombrg@gmail.com"
        self.to_address = "strombrg@gmail.com"
        self.ignore_content = None
        self.account = "strombrg@gmail.com"
        self.is_html = False

        while sys.argv[1:]:
            if sys.argv[1] == "-s":
                self.subject = sys.argv[2]
                del sys.argv[1]
            elif sys.argv[1] == "-a":
                self.account = sys.argv[2]
                del sys.argv[1]
            elif sys.argv[1] == "-Z":
                with open(sys.argv[2], "r") as file_:
                    self.ignore_content = file_.read()
                del sys.argv[1]
            elif sys.argv[1] == "-z":
                self.only_if_nonzero = True
            elif sys.argv[1] == "--html":
                self.is_html = True
            elif sys.argv[1] == "-t":
                self.to_address = sys.argv[2]
                del sys.argv[1]
            elif sys.argv[1] == "-f":
                self.from_address = sys.argv[2]
                del sys.argv[1]
            elif sys.argv[1] in ["-h", "--help"]:
                usage(0)
            else:
                sys.stderr.write("%s: Unrecognized option: %s\n" % (sys.argv[0], sys.argv[1]))
                usage(1)
            del sys.argv[1]


def main():
    """Start the ball rolling."""
    options = Options()

    body = sys.stdin.read()
    if options.only_if_nonzero and len(options.body) == 0:
        sys.exit(0)

    if options.ignore_content is not None and options.ignore_content == options.body:
        sys.exit(0)

    mailer = mailer_mod.Mailer(options.account)

    mailer.send(
        from_address=options.from_address,
        to_address=options.to_address,
        subject=options.subject,
        body=body,
        is_html=options.is_html,
    )


main()