# -*- coding: utf-8 -*-
from mypy import api
from prospector.message import Location, Message
from prospector.tools import ToolBase

__all__ = (
    'MypyTool',
)


MYPY_OPTIONS = [
    'allow',
    'check',
    'disallow',
    'no-check',
    'no-warn',
    'warn'
]


def format_message(message):
    try:
        (path, line, char, err_type, err_msg) = message.split(':', 4)
        character = int(char)
    except ValueError:
        (path, line, err_type, err_msg) = message.split(':', 3)
        character = None
    location = Location(
        path=path,
        module=None,
        function=None,
        line=int(line),
        character=character,
    )
    return Message(
        source='mypy',
        code=err_type.lstrip(" "),
        location=location,
        message=err_msg.lstrip(" ")
    )


class MypyTool(ToolBase):
    def __init__(self, *args, **kwargs):
        super(MypyTool, self).__init__(*args, **kwargs)
        self.checker = api
        self.options = ['--show-column-numbers']

    def configure(self, prospector_config, _):
        options = prospector_config.tool_options('mypy')

        strict = options.get('strict', False)

        follow_imports = options.get('follow-imports', 'normal')
        ignore_missing_imports = options.get('ignore-missing-imports', False)
        implict_optional = options.get('implict-optional', False)
        platform = options.get('platform', None)
        python_2_mode = options.get('python-2-mode', False)
        python_version = options.get('python-version', None)
        strict_optional = options.get('strict-optional', False)

        self.options.append('--follow-imports=%s' % follow_imports)

        if strict:
            self.options.append('--strict')

        if ignore_missing_imports:
            self.options.append('--ignore-missing-imports')

        if implict_optional:
            self.options.append('--implict-optional')

        if platform:
            self.options.append('--platform %s' % platform)

        if python_2_mode:
            self.options.append('--py2')

        if python_version:
            self.options.append('--python-version %s' % python_version)

        if strict_optional:
            self.options.append('--strict-optional')

        for list_option in MYPY_OPTIONS:
            for entry in options.get(list_option, []):
                self.options.append('--%s-%s' % (list_option, entry))

    def run(self, found_files):
        paths = [path for path in found_files.iter_module_paths()]
        paths.extend(self.options)
        result = self.checker.run(paths)
        report, _ = result[0], result[1:]  # noqa

        return [format_message(message) for message in report.splitlines()]