My photoshop file was destroyed

Have you not got auto recovery enabled?

It saves and updates a recovery file according to the specified time period, and if Photoshop successfully saves the file, it deletes the recovery file.  It has worked every time for me when Photoshop has crashed.  I can't think of any reason why it wouldn't also work with a power out.

I wonder if the sudden power loss does not give Photoshop time to make a note of the recovery file?  It usually loads the recovered files automatically, but I am not sure where they are located.

+1 for UPS. A small price for peace of mind. I think I paid around $350 for mine a couple of years ago - it will keep computer and internet alive for about 40 minutes.

@Amjad Habash 

In addition to what Ged and Axel said, invest in an Uninterruptible Power Supply (UPS).

"An uninterruptible power supply (UPS), offers guaranteed power protection for connected electronics. When power is interrupted, or fluctuates outside safe levels, a UPS will instantly provide clean battery backup power and surge protection for plugged-in, sensitive equipment."

See this guide for more info:

https://www.apc.com/us/en/support/product-support/ups-buying-guide-for-selecting-a-battery-backup-system.jsp

Jane

As @Ged_Traynor wrote you can't restore the corrupt image. There's also no automatic save option in Photoshop.

In the future you should save your work again and again when you work in Photoshop (this also applies to other programs).  And periodically you should backup the files to a external drive, cloud etc.

@Amjad Habash I'm afraid you may be out of luck, you should keep backups of your important files and do incremental saves as you're working on them