'''

    A simplified version of the unittest module, adapted to run unit tests on data sets instead of code.

@author: olivier.massot, 2018
'''
import inspect
import sys


UNKNOWN = 0
SUCCESS = 1
FAILURE = 2
ERROR = 3

_result_to_str = {UNKNOWN: 'Inconnu',
                  SUCCESS: 'Succès',
                  FAILURE: 'Echec',
                  ERROR: 'Erreur'}

class TestError():
    def __init__(self, message, info = {}, critical=False):
        self.message = message
        self.info = info
        self.critical = critical
        
    def __repr__(self):
        return f"TestError<message='{self.message}'; info={self.info}; critical={self.critical}>"

class TestResult():
    def __init__(self, test):
        self._test = test
        self._name = ""
        self._status = UNKNOWN
        self.errors = []
        self._exc_info = None

    @property
    def name(self):
        return self._name or self._test.__name__[5:]

    @property
    def title(self):
        return self._test.__doc__.split("\n")[0].strip() 

    @property
    def description(self):
        return self._test.__doc__.strip() 
    
    @property
    def status(self):
        return self._status

    @property
    def status_str(self):
        return _result_to_str[self._status]

    def __repr__(self):
        return f"TestResult<title='{self.title}'; status={self.status}; name={self.name}; method={self._test.__name__}; errors_count={len(self.errors)}>"

    def log_error(self, message, info={}):
        self._status = FAILURE
        error = TestError(message, info)
        self.errors.append(error)

    def handle_exception(self):
        self._status = ERROR
        error = TestError("Une erreur inconnue s'est produite, veuillez consulter les fichiers de journalisation.", 
                          {"exc_info": sys.exc_info()})
        self.errors.append(error)

class BaseChecker():
    
    def __init__(self):
        self._test_running = None
        
    def setUp(self):
        pass
    
    def tearDown(self):
        pass
    
    def log_error(self, message, **info):
        self._test_running.log_error(message, info)
    
    def run(self):
        
        tests_results = []
        
        for mname, m in inspect.getmembers(self, predicate=inspect.ismethod):
            if mname[:5] == 'test_':
                
                r = TestResult(m)
                
                self._test_running = r
                
                self.setUp()
                
                try:
                    m()
                except:
                    r.handle_exception()
                
                self.tearDown()

                tests_results.append(r)
        
                if any(err.critical for err in r.errors):
                    break
        
        return tests_results
    

    
    
if __name__ == '__main__':
    
    class ExampleChecker(BaseChecker):
        def test_a(self):
            """ Test 1 """
            for i in range(10):
                self.log_error(f"error-{i}", {"i": i})
        
        def test_b(self):
            """ Test 2
            some longer description """
            return
    
    ch = ExampleChecker()
    results = ch.run()
    
    for r in results:
        print(r)
        for e in r.errors:
            print(e)