Startup Idea: Positive-thought Reinforcement App for Depression

Startup idea to develop an application that collects and feeds back positive thoughts from oneself or friends, particularly beneficial to people dealing with depression. The application should have the capability to detect decreased work productivity or increased mistakes, then provide positive reinforcement unprompted to boost motivation.

I'm a person with depression, married to someone with depression, with lots of friends that have depression.

An app/program that could get positive thoughts from you/your friends and feed them back to you when requested would be something that could really help people in depressive states.

If it could be linked with working software and able to detect when work is going slower then usual, or more mistakes being made, something positive popping up unprompted would help in motivation. right now: trying to work through depressive times, not always successful.