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#pragma once
#include "esp_err.h"
#include "viewport_state.h"
esp_err_t state_machine_init(void);
// Transition to AWAKE or ASLEEP. Idempotent: no-op if already there.
// Returns ESP_ERR_INVALID_STATE if the device is unconfigured.
// Side-effects (under one critical section):
// AWAKE -> backlight on, idle timer (re)armed
// ASLEEP -> backlight off, idle timer cancelled, framebuffer discarded
esp_err_t state_machine_set(viewport_run_state_t target);
// Called by /frame after a successful paint. Restarts the idle timer
// while awake; no-op otherwise.
void state_machine_frame_painted(void);
// Snapshot of current state.
viewport_run_state_t state_machine_current(void);
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