"""
Test Result
-----------

Provides a TextTestResult that extends unittest._TextTestResult to
provide support for error classes (such as the builtin skip and
deprecated classes), and hooks for plugins to take over or extend
reporting.
"""

import logging
from unittest import _TextTestResult
from nose.config import Config
from nose.util import isclass, ln as _ln # backwards compat

log = logging.getLogger('nose.result')


def _exception_detail(exc):
    # this is what stdlib module traceback does
    try:
        return str(exc)
    except:
        return '<unprintable %s object>' % type(exc).__name__


class TextTestResult(_TextTestResult):
    """Text test result that extends unittest's default test result
    support for a configurable set of errorClasses (eg, Skip,
    Deprecated, TODO) that extend the errors/failures/success triad.
    """    
    def __init__(self, stream, descriptions, verbosity, config=None,
                 errorClasses=None):        
        if errorClasses is None:
            errorClasses = {}
        self.errorClasses = errorClasses
        if config is None:
            config = Config()       
        self.config = config
        _TextTestResult.__init__(self, stream, descriptions, verbosity)
                
    def addError(self, test, err):
        """Overrides normal addError to add support for
        errorClasses. If the exception is a registered class, the
        error will be added to the list for that class, not errors.
        """
        stream = getattr(self, 'stream', None)
        ec, ev, tb = err
        try:
            exc_info = self._exc_info_to_string(err, test)
        except TypeError:
            # 2.3 compat
            exc_info = self._exc_info_to_string(err)
        for cls, (storage, label, isfail) in self.errorClasses.items():
            if isclass(ec) and issubclass(ec, cls):
                if isfail:
                    test.passed = False
                storage.append((test, exc_info))
                # Might get patched into a streamless result
                if stream is not None:
                    if self.showAll:
                        message = [label]
                        detail = _exception_detail(err[1])
                        if detail:
                            message.append(detail)
                        stream.writeln(": ".join(message))
                    elif self.dots:
                        stream.write(label[:1])
                return
        self.errors.append((test, exc_info))
        test.passed = False
        if stream is not None:
            if self.showAll:
                self.stream.writeln('ERROR')
            elif self.dots:
                stream.write('E')

    def printErrors(self):
        """Overrides to print all errorClasses errors as well.
        """
        _TextTestResult.printErrors(self)
        for cls in self.errorClasses.keys():
            storage, label, isfail = self.errorClasses[cls]
            if isfail:
                self.printErrorList(label, storage)
        # Might get patched into a result with no config
        if hasattr(self, 'config'):
            self.config.plugins.report(self.stream)

    def printSummary(self, start, stop):
        """Called by the test runner to print the final summary of test
        run results.
        """
        write = self.stream.write
        writeln = self.stream.writeln
        taken = float(stop - start)
        run = self.testsRun
        plural = run != 1 and "s" or ""
        
        writeln(self.separator2)
        writeln("Ran %s test%s in %.3fs" % (run, plural, taken))
        writeln()

        summary = {}
        eckeys = self.errorClasses.keys()
        eckeys.sort()
        for cls in eckeys:
            storage, label, isfail = self.errorClasses[cls]
            count = len(storage)
            if not count:
                continue
            summary[label] = count
        if len(self.failures):
            summary['failures'] = len(self.failures)
        if len(self.errors):
            summary['errors'] = len(self.errors)

        if not self.wasSuccessful():
            write("FAILED")
        else:
            write("OK")
        items = summary.items()
        if items:
            items.sort()
            write(" (")
            write(", ".join(["%s=%s" % (label, count) for
                             label, count in items]))
            writeln(")")
        else:
            writeln()

    def wasSuccessful(self):
        """Overrides to check that there are no errors in errorClasses
        lists that are marked as errors and should cause a run to
        fail.
        """
        if self.errors or self.failures:
            return False
        for cls in self.errorClasses.keys():
            storage, label, isfail = self.errorClasses[cls]
            if not isfail:
                continue
            if storage:
                return False
        return True

    def _addError(self, test, err):
        try:
            exc_info = self._exc_info_to_string(err, test)
        except TypeError:
            # 2.3: does not take test arg
            exc_info = self._exc_info_to_string(err)
        self.errors.append((test, exc_info))
        if self.showAll:
            self.stream.write('ERROR')
        elif self.dots:
            self.stream.write('E')

    def _exc_info_to_string(self, err, test=None):
        # 2.3/2.4 -- 2.4 passes test, 2.3 does not
        try:
            return _TextTestResult._exc_info_to_string(self, err, test)
        except TypeError:
            # 2.3: does not take test arg
            return _TextTestResult._exc_info_to_string(self, err)


def ln(*arg, **kw):
    from warnings import warn
    warn("ln() has moved to nose.util from nose.result and will be removed "
         "from nose.result in a future release. Please update your imports ",
         DeprecationWarning)
    return _ln(*arg, **kw)