# -*- coding: utf-8 -*-
import os
import sys


class Location(object):

    def __init__(self, path, module, function, line, character, absolute_path=True):
        if sys.version_info.major == 2 and isinstance(path, str):
            # If this is not a unicode object, make it one! Some tools return
            # paths as unicode, some as bytestring, so to ensure that they are
            # all the same, we normalise here. For Python3 this is (probably)
            # always a str so no need to do anything.
            path = path.decode(sys.getfilesystemencoding())
        self.path = path
        self._path_is_absolute = absolute_path
        self.module = module or None
        self.function = function or None
        self.line = None if line == -1 else line
        self.character = None if character == -1 else character

    def to_absolute_path(self, root):
        if self._path_is_absolute:
            return
        self.path = os.path.abspath(os.path.join(root, self.path))
        self._path_is_absolute = True

    def to_relative_path(self, root):
        if not self._path_is_absolute:
            return
        self.path = os.path.relpath(self.path, root)
        self._path_is_absolute = False

    def as_dict(self):
        return {
            'path': self.path,
            'module': self.module,
            'function': self.function,
            'line': self.line,
            'character': self.character
        }

    def __hash__(self):
        return hash((self.path, self.line, self.character))

    def __eq__(self, other):
        return self.path == other.path and self.line == other.line and self.character == other.character

    def __lt__(self, other):
        if self.path == other.path:
            if self.line == other.line:
                return (self.character or -1) < (other.character or -1)
            return (self.line or -1) < (other.line or -1)  # line can be None if it a file-global warning
        return self.path < other.path


class Message(object):

    def __init__(self, source, code, location, message):
        self.source = source
        self.code = code
        self.location = location
        self.message = message

    def to_absolute_path(self, root):
        self.location.to_absolute_path(root)

    def to_relative_path(self, root):
        self.location.to_relative_path(root)

    def as_dict(self):
        return {
            'source': self.source,
            'code': self.code,
            'location': self.location.as_dict(),
            'message': self.message
        }

    def __repr__(self):
        return "%s-%s" % (self.source, self.code)

    def __eq__(self, other):
        if self.location == other.location:
            return self.code == other.code
        else:
            return False

    def __lt__(self, other):
        if self.location == other.location:
            return self.code < other.code
        return self.location < other.location


def make_tool_error_message(filepath, source, code, message,
                            line=0, character=0, module=None, function=None):
    location = Location(
        path=filepath,
        module=module,
        function=function,
        line=line,
        character=character
    )
    return Message(
        source=source,
        code=code,
        location=location,
        message=message
    )