[offsiteReq] Update SierraItemUpdater to add availabilitySlots for DeepStore items

[agnesgaroux]

Pull in the item's location code from Sierra when we get its access conditions here then use it in getAvailableDates to figure out whether it's DeepStore (harop) or onsite (any other location code)

If it's DeepStore, fetch the venue from content-api and apply correct LeadTimeInDays

❓I don't think the location code should be part of the DisplayAccessCondition since it's not something we want to display on the work page. We could include it and let wc.org ignore it, or refactor updateItems so that it handles items one by one which I believe would keep things are bit cleaner

-> there will be some slight complication around the available dates after the first

• first available date is dependent on DeppStore working days. Alexandra confirmed it's any day other than Saturdays, Sundays and public holidays
• the following days are dependent on the library opening days: once the item is onsite it can be viewed in the library any day it is open
• Therefore we'll need to fetch both DeeptStore and Library venues for DeepStore items. The 1st AvailabilitySlot will be the day the item is delivered, then the following ones will be library opening days

[agnesgaroux]

Rules for DeepStore leadTimeInDays

The logic as I understand it is:

• 10 DeepStore working days to get the item back on site
• After that the item can be viewed any day that the library is open

If I make a request on Monday 3rd June:

• the item will be delivered on site on Friday 14th June
• it can be viewed Saturday 15th June, then Monday 17th to Saturday 22nd and Monday 24th to Friday 28th (the current choice of 12 days to pick from)
• If there were x public holidays between Monday 3rd June and Friday 14th June, the delivery date would be postponed by as many days

That's assuming, TBC, that:

• the day of the request (Monday 3rd June) is day 1 of the 10 days DeepStore lead time, not day 0
• the item cannot be viewed on the day it is delivered, but the next day the library is open
• we give the user a 12 opening day window to come on site to view the item once it's been delivered. If they want to see it at a later date, they ned to make the request at a later date

[agnesgaroux]

Email sent to LE&E to confirm the above points

[pollecuttn]

As well as public holidays there's also the longer Christmas closure, which changes every year and is put into the library opening times by Editorial.