from django.conf import settings

from django.db.backends.creation import BaseDatabaseCreation

class DatabaseCreation(BaseDatabaseCreation):

    # This dictionary maps Field objects to their associated MySQL column

    # types, as strings. Column-type strings can contain format strings; they'll

    # be interpolated against the values of Field.__dict__ before being output.

    # If a column type is set to None, it won't be included in the output.

    data_types = {

        'AutoField':         'integer AUTO_INCREMENT',

        'BooleanField':      'bool',

        'CharField':         'varchar(%(max_length)s)',

        'CommaSeparatedIntegerField': 'varchar(%(max_length)s)',

        'DateField':         'date',

        'DateTimeField':     'datetime',

        'DecimalField':      'numeric(%(max_digits)s, %(decimal_places)s)',

        'FileField':         'varchar(%(max_length)s)',

        'FilePathField':     'varchar(%(max_length)s)',

        'FloatField':        'double precision',

        'IntegerField':      'integer',

        'IPAddressField':    'char(15)',

        'NullBooleanField':  'bool',

        'OneToOneField':     'integer',

        'PositiveIntegerField': 'integer UNSIGNED',

        'PositiveSmallIntegerField': 'smallint UNSIGNED',

        'SlugField':         'varchar(%(max_length)s)',

        'SmallIntegerField': 'smallint',

        'TextField':         'longtext',

        'TimeField':         'time',

    }

    def sql_table_creation_suffix(self):

        suffix = []

        if settings.TEST_DATABASE_CHARSET:

            suffix.append('CHARACTER SET %s' % settings.TEST_DATABASE_CHARSET)

        if settings.TEST_DATABASE_COLLATION:

            suffix.append('COLLATE %s' % settings.TEST_DATABASE_COLLATION)

        return ' '.join(suffix)

    def sql_for_inline_foreign_key_references(self, field, known_models, style):

        "All inline references are pending under MySQL"

        return [], True

    def sql_for_inline_many_to_many_references(self, model, field, style):

        from django.db import models

        opts = model._meta

        qn = self.connection.ops.quote_name

        table_output = [

            '    %s %s %s,' %

                (style.SQL_FIELD(qn(field.m2m_column_name())),

                style.SQL_COLTYPE(models.ForeignKey(model).db_type()),

                style.SQL_KEYWORD('NOT NULL')),

            '    %s %s %s,' %

            (style.SQL_FIELD(qn(field.m2m_reverse_name())),

            style.SQL_COLTYPE(models.ForeignKey(field.rel.to).db_type()),

            style.SQL_KEYWORD('NOT NULL'))

        ]

        deferred = [

            (field.m2m_db_table(), field.m2m_column_name(), opts.db_table,

                opts.pk.column),

            (field.m2m_db_table(), field.m2m_reverse_name(),

                field.rel.to._meta.db_table, field.rel.to._meta.pk.column)

            ]

        return table_output, deferred