Calculate a simple ETA

[vcardillo]

Calculate a simple system-wide ETA (SSE) to display in the app.

Average orders per driver * 15 minutes = sse_result

• Use settings.sse_minutesMultiplier instead of hardcoding minutes.
• Average orders per driver = Total outstanding orders / total online drivers
• Total outstanding orders = All orders != (Delivered or Cancelled)
• Use the settings table to store the sse_result, and to find the minutes multiplier at sse_minutesMultiplier

All fields are already on dev and prod.

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• Edge cases: We must ensure that we "reset" the result when we are closed, back to 15 minutes.
• The minimum is sse_minutesMultiplier and the value should not be lower.
• If Average orders per driver comes to some decimal that results in avg*min being some decimal amount of minutes, let's just round the result.
• Round to the nearest 5 minutes. So 17.1 minutes rounds to 17 rounds to 15. App will display 15-25 minutes. 17.5 minutes rounds to 18 rounds to 20. App will display 20-30 minutes.

[vcardillo]

vincent [7:32 PM] There are interesting implications as to when we round the numbers.

​[7:33] So by not rounding 13/4 and leaving it as 3.25, you get 48.75 minutes which becomes 50 minutes. As opposed to rounding it earlier to 3, and ending up with 45 minutes still.

​[7:33] Not really a big deal, just an observation.

[marcdoan]

This has been released.