
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $y=A\sin (ωx+ϕ)$, where $A > 0,ω > 0,|ϕ| < \dfrac {π}{2}$, if the minimum positive period of the function is $π$, the maximum value is $2$, and it passes through the point $(0,1)$,
$(1)$ Find the analytic expression of the function;
$(2)$ Find the interval where the function is monotonically decreasing.

Present the answer in LaTex format: \boxed{Your answer}
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