# -*- coding: utf-8 -*-
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
import logging

from openerp import models
from openerp.osv import expression


_logger = logging.getLogger(__name__)


def patch_leaf_trgm(method):
    def decorate_leaf_to_sql(self, eleaf):
        model = eleaf.model
        leaf = eleaf.leaf
        left, operator, right = leaf
        table_alias = '"%s"' % (eleaf.generate_alias())

        if operator == '%':
            sql_operator = '%%'
            params = []

            if left in model._columns:
                format = model._columns[left]._symbol_set[0]
                column = '%s.%s' % (table_alias, expression._quote(left))
                query = '(%s %s %s)' % (column, sql_operator, format)
            elif left in expression.MAGIC_COLUMNS:
                query = "(%s.\"%s\" %s %%s)" % (
                    table_alias, left, sql_operator)
                params = right
            else:  # Must not happen
                raise ValueError(
                    "Invalid field %r in domain term %r" % (left, leaf))

            if left in model._columns:
                params = model._columns[left]._symbol_set[1](right)

            if isinstance(params, basestring):
                params = [params]
            return query, params
        elif operator == 'inselect':
            right = (right[0].replace(' % ', ' %% '), right[1])
            eleaf.leaf = (left, operator, right)
        return method(self, eleaf)

    decorate_leaf_to_sql.__decorated__ = True

    return decorate_leaf_to_sql


def patch_generate_order_by(method):
    def decorate_generate_order_by(self, order_spec, query):
        if order_spec and order_spec.startswith('similarity('):
            return ' ORDER BY ' + order_spec
        return method(self, order_spec, query)

    decorate_generate_order_by.__decorated__ = True

    return decorate_generate_order_by


class IrModel(models.Model):

    _inherit = 'ir.model'

    def _register_hook(self, cr, ids=None):
        # We have to prevent wrapping the function twice to avoid recursion
        # errors
        if not hasattr(expression.expression._expression__leaf_to_sql,
                       '__decorated__'):
            expression.expression._expression__leaf_to_sql = patch_leaf_trgm(
                expression.expression._expression__leaf_to_sql)

        if '%' not in expression.TERM_OPERATORS:
            expression.TERM_OPERATORS += ('%',)

        if not hasattr(models.BaseModel._generate_order_by,
                       '__decorated__'):
            models.BaseModel._generate_order_by = patch_generate_order_by(
                models.BaseModel._generate_order_by)

        return super(IrModel, self)._register_hook(cr)