# This file is part of beets.
# Copyright 2016, Blemjhoo Tezoulbr <baobab@heresiarch.info>.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Moves patterns in path formats (suitable for moving articles)."""


import re

from beets.plugins import BeetsPlugin

__author__ = "baobab@heresiarch.info"
__version__ = "1.1"

PATTERN_THE = "^the\\s"
PATTERN_A = "^[a][n]?\\s"
FORMAT = "{0}, {1}"


class ThePlugin(BeetsPlugin):
    patterns = []

    def __init__(self):
        super().__init__()

        self.template_funcs["the"] = self.the_template_func

        self.config.add(
            {
                "the": True,
                "a": True,
                "format": "{0}, {1}",
                "strip": False,
                "patterns": [],
            }
        )

        self.patterns = self.config["patterns"].as_str_seq()
        for p in self.patterns:
            if p:
                try:
                    re.compile(p)
                except re.error:
                    self._log.error("invalid pattern: {0}", p)
                else:
                    if not (p.startswith("^") or p.endswith("$")):
                        self._log.warning(
                            'warning: "{0}" will not ' "match string start/end",
                            p,
                        )
        if self.config["a"]:
            self.patterns = [PATTERN_A] + self.patterns
        if self.config["the"]:
            self.patterns = [PATTERN_THE] + self.patterns
        if not self.patterns:
            self._log.warning("no patterns defined!")

    def unthe(self, text, pattern):
        """Moves pattern in the path format string or strips it

        text -- text to handle
        pattern -- regexp pattern (case ignore is already on)
        strip -- if True, pattern will be removed
        """
        if text:
            r = re.compile(pattern, flags=re.IGNORECASE)
            try:
                t = r.findall(text)[0]
            except IndexError:
                return text
            else:
                r = re.sub(r, "", text).strip()
                if self.config["strip"]:
                    return r
                else:
                    fmt = self.config["format"].as_str()
                    return fmt.format(r, t.strip()).strip()
        else:
            return ""

    def the_template_func(self, text):
        if not self.patterns:
            return text
        if text:
            for p in self.patterns:
                r = self.unthe(text, p)
                if r != text:
                    self._log.debug('"{0}" -> "{1}"', text, r)
                    break
            return r
        else:
            return ""
