To start with, get the battery tested properly. If it's having difficulty cold starting in the middle of summer, then the battery may well be knackered.
With any luck, if it is the battery, then changing that may well lead to lots of other faults vanishing - modern cars don't like weak batteries, and tend to throw up lots of weird faults.
If the battery is fine, on the other hand, then you may well have a lot of expense in front of you. Injectors for the starting, Teves ESP fault requiring a rebuild of the ABS unit, gearbox fluid change or even rebuild ...
Or just get shot of it
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