from openerp import models, fields, api
from openerp.tools.translate import _
import openerp.addons.decimal_precision as dp
from datetime import datetime

class stock_transfer_details(models.TransientModel):
    _name = 'stock.transfer_details'
    _description = 'Picking wizard'

    picking_id = fields.Many2one('stock.picking', 'Picking')
    item_ids = fields.One2many('stock.transfer_details_items', 'transfer_id', 'Items', domain=[('product_id', '!=', False)])
    packop_ids = fields.One2many('stock.transfer_details_items', 'transfer_id', 'Packs', domain=[('product_id', '=', False)])
    picking_source_location_id = fields.Many2one('stock.location', string="Head source location", related='picking_id.location_id', store=False, readonly=True)
    picking_destination_location_id = fields.Many2one('stock.location', string="Head destination location", related='picking_id.location_dest_id', store=False, readonly=True)

    def default_get(self, cr, uid, fields, context=None):
        if context is None: context = {}
        res = super(stock_transfer_details, self).default_get(cr, uid, fields, context=context)
        picking_ids = context.get('active_ids', [])
        active_model = context.get('active_model')

        if not picking_ids or len(picking_ids) != 1:
            # Partial Picking Processing may only be done for one picking at a time
            return res
        assert active_model in ('stock.picking'), 'Bad context propagation'
        picking_id, = picking_ids
        picking = self.pool.get('stock.picking').browse(cr, uid, picking_id, context=context)
        items = []
        packs = []
        if not picking.pack_operation_ids:
            picking.do_prepare_partial()
        for op in picking.pack_operation_ids:
            item = {
                'packop_id': op.id,
                'product_id': op.product_id.id,
                'product_uom_id': op.product_uom_id.id,
                'quantity': op.product_qty,