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# req-037
Schist must implement the procedure, described below as
`update_budget_drips_for_bucket`.
Source: req-030
## update_budget_drips_for_bucket
Inputs:
- A bucket, `bucket`
1. For each pipe `p` such that `p.bucket_id = bucket.id`, carry out the
sub-procedure, `update_budget_drips_for_pipe(pipe)`, as described below.
## update_budget_drips_for_pipe
Inputs:
- A pipe, `pipe`
1. Let `prev_drip` be a drip `d` with a most recent value for the property
`date` such that `d.pipe_id = pipe.id`
2. For each calendar date `d` in the range `(prev_drip.date, today]`, insert a
new drip for `pipe`:
- `bucket_id`: `pipe.bucket_id`
- `pipe_id`: `pipe.id`
- `date`: `d`
- `amount`: the result of the sub-procedure, `pipe_amount_for_day(pipe, d)`
as described below
- `timestamp`: now as a Unix timestamp
## pipe_amount_for_date
Inputs:
- A pipe, `pipe`
- A calendar date, `date`
1. If `pipe.period` is `day`, return `pipe.amount`.
2. If `pipe.period` is `week`, return `pipe.amount ÷ 7`.
3. Let `days_in_month` be the number of days in the month to which `date`
belongs.
4. If `pipe.period` is `month`, return `pipe.amount ÷ days_in_month`.
5. Let `days_in_year` be the number of days in the year to which `date` belongs.
6. If `period` is not `year`, panic.
7. Return `pipe.amount ÷ days_in_year`.
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