from record import *

RECORD_TYPES = [
    'SubmitterRecord',
    'EmployerRecord',
    'EmployeeWageRecord',
    'OptionalEmployeeWageRecord',
    'TotalRecord',
    'StateWageRecord',
    'OptionalTotalRecord',
    'StateTotalRecord',
    'FinalRecord'
    ]

def test():
    import record, model
    for rname in RECORD_TYPES:
        inst = record.__dict__[rname]()
        print type(inst), inst.record_identifier, len(inst.output())


def test_dump():
    import record, StringIO
    records = [
        record.SubmitterRecord(),
        record.EmployerRecord(),
        record.EmployeeWageRecord(),
        ]
    out = StringIO.StringIO()
    dump(records, out)
    return out


def test_record_order():
    import record
    records = [
        record.SubmitterRecord(),
        record.EmployerRecord(),
        record.EmployeeWageRecord(),
        record.TotalRecord(),
        record.FinalRecord(),
    ]
    verify_record_order(records)


def test_load(fp):
    return load(fp)

def load(fp):
    # BUILD LIST OF RECORD TYPES
    import record
    types = {}
    for r in RECORD_TYPES:
        klass = record.__dict__[r]
        types[klass.record_identifier] = klass

    # PARSE DATA INTO RECORDS AND YIELD THEM
    while fp.tell() < fp.len:
        record_ident = fp.read(2)
        if record_ident in types:
            record = types[record_ident]()
            record.read(fp)
            yield record

def loads(s):
    import StringIO
    fp = StringIO.StringIO(s)
    return load(fp)


def dump(records, fp):
    for r in records:
        fp.write(r.output())

def dumps(records):
    import StringIO
    fp = StringIO.StringIO()
    dump(records, fp)
    fp.seek(0)
    return fp.read()


# THIS WAS IN CONTROLLER, BUT UNLESS WE
# REALLY NEED A CONTROLLER CLASS, IT'S SIMPLER
# TO JUST KEEP IT IN HERE.
def verify_required_records(records):
    types = [rec.__class__.__name__ for rec in records]
    req_types = []

    for r in record.RECORD_TYPES:
        klass = record.__dict__[r]
        if klass.required:
            req_types.append(klass.__name__)
    
    while req_types:
        req = req_types[0]
        if req not in types:
            raise ValidationError("Record set missing required record: %s" % req)
        else:
            req_types.remove(req)

def verify_record_order(records):
    import record
    from fields import ValidationError
    
    # 1st record must be SubmitterRecord
    if not isinstance(records[0], record.SubmitterRecord):
        raise ValidationError("First record must be SubmitterRecord")

    # 2nd record must be EmployeeRecord
    if not isinstance(records[1], record.EmployerRecord):
        raise ValidationError("The first record after SubmitterRecord must be an EmployeeRecord")

    # FinalRecord - Must be the last record on the file
    if not isinstance(records[-1], record.FinalRecord):
        raise ValidationError("Last record must be a FinalRecord")

    # an EmployerRecord *must* come after each EmployeeWageREcord
    for i in range(len(records)):
        if isinstance(records[i], record.EmployerRecord):
            if not isinstance(records[i+1], record.EmployeeWageRecord):
                raise ValidationError("All EmployerRecords must be followed by an EmployeeWageRecord")

    num_ro_records = len(filter(lambda x:isinstance(x, record.OptionalEmployeeWageRecord), records))
    num_ru_records = len(filter(lambda x:isinstance(x, record.OptionalTotalRecord), records))
    num_employer_records = len(filter(lambda x:isinstance(x, record.EmployerRecord), records))
    num_total_records = len(filter(lambda x: isinstance(x, record.TotalRecord), records))

    # a TotalRecord is required for each instance of an EmployeeRecord
    if num_total_records != num_employer_records:
        raise ValidationError("Number of TotalRecords (%d) does not match number of EmployeeRecords (%d)" % (
            num_total_records, num_employer_records))

    # an OptionalTotalRecord is required for each OptionalEmployeeWageRecord
    if num_ro_records != num_ru_records:
        raise ValidationError("Number of OptionalEmployeeWageRecords (%d) does not match number OptionalTotalRecords (%d)" % (
            num_ro_records, num_ru_records))

    # FinalRecord - Must appear only once on each file.
    if len(filter(lambda x:isinstance(x, record.FinalRecord), records)) != 1:
        raise ValidationError("Incorrect number of FinalRecords")