## Controller Python Script "validate_txn"
##bind container=container
##bind context=context
##bind namespace=
##bind script=script
##bind state=state
##bind subpath=traverse_subpath
##parameters=post_date='', description='', amount='', users=[]
##title=validates a new transaction


if post_date != '' and context.restrict_post_dates:
    ok, msg = context.validate_new_txn_date(post_date)
    if not ok:
        state.setError("post_date", msg)


if description == '':
    state.setError("description", "No description specified.")


try:
    amount = float(amount)
except ValueError:
    state.setError("amount", "Not a number.")
except TypeError:
    state.setError("amount", "No amount specified.")
if amount == '':
    state.setError("amount", "No amount specified.")
if amount <= 0:
    state.setError('amount', "Not a positive amount.")


if users is None or len(users) == 0:
    state.setError("users", "At least one user must be selected.")
else:
    any_weight = False
    for u in users:
        wid = 'users_' + u + '_weight'
        weight = context.REQUEST.form.get(wid)
        if weight is not None and weight != '':
            any_weight = True

    empty_weight_errs = False
    if any_weight:
        for u in users:
            wid = 'users_' + u + '_weight'
            weight = context.REQUEST.form.get(wid)
            try:
                weight = float(weight)
            except ValueError:
                state.setError(wid, "Not a number.")
            except TypeError:
                state.setError(wid, "No proportion specified.")
                empty_weight_errs = True
            if weight == '':
                state.setError(wid, "No proportion specified.")
                empty_weight_errs = True
            if weight <= 0:
                state.setError(wid, "Not a positive proportion.")

    if empty_weight_errs:
        state.setError("users", """
                If a proportion is specified for any selected user, a
                proportion must be specifed for all selected users.
                """)

if state.getErrors():
    return state.set(portal_status_message="Please correct the errors.",
                     status="failure")
else:
    return state.set(portal_status_message="Transaction is valid.")