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// Copyright 2021 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <stdbool.h>
#include <stdint.h>
// A token that can be used to cancel an existing deferred execution.
typedef uint8_t deferred_token;
#define INVALID_DEFERRED_TOKEN 0
// Callback to execute.
// -- Parameter trigger_time: the intended trigger time to execute the callback -- equivalent time-space as timer_read32()
// cb_arg: the callback argument specified when enqueueing the deferred executor
// -- Return value: Non-zero re-queues the callback to execute after the returned number of milliseconds. Zero cancels repeated execution.
typedef uint32_t (*deferred_exec_callback)(uint32_t trigger_time, void *cb_arg);
// Configures the supplied deferred executor to be executed after the required number of milliseconds.
// -- Parameter delay_ms: the number of milliseconds before executing the callback
// -- callback: the executor to invoke
// -- cb_arg: the argument to pass to the executor, may be NULL if unused by the executor
// -- Return value: a token usable for cancellation, or INVALID_DEFERRED_TOKEN if an error occurred
deferred_token defer_exec(uint32_t delay_ms, deferred_exec_callback callback, void *cb_arg);
// Allows for extending the timeframe before an existing deferred execution is invoked.
// -- Parameter token: the returned value from defer_exec for the deferred execution you wish to extend.
// -- delay_ms: the new delay (with respect to the current time)
// -- Return value: if the token was found, and the delay was extended
bool extend_deferred_exec(deferred_token token, uint32_t delay_ms);
// Allows for cancellation of an existing deferred execution.
// -- Parameter token: the returned value from defer_exec for the deferred execution you wish to cancel.
// -- Return value: if the token was found, and the executor was cancelled
bool cancel_deferred_exec(deferred_token token);
// Forward declaration for the main loop in order to execute any deferred executors. Should not be invoked by keyboard/user code.
void deferred_exec_task(void);
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