<?php

/**
 * This function should not be called directly!!!
 * ==============================================
 *
 * Using our API key, we question the API to get the UUID of the
 * Foobot device. With this info, we can go on to call sensor data.
 *
 * This retrieved data should then be added to the database.
 *
 * We must never call this function directly! Instead, we must
 * retrieve the data we have stored in our custom database table (see
 * "database.php"). This function is only used to update the
 * table.
 *
 */
function bd_foobot_call_api_devices() {

	// Vars
	$key  = bd_foobot_get_api_key();
	$user = bd_foobot_get_api_user();
	$url  = 'https://api.foobot.io/v2/owner/' . $user . '/device/';
	$args = array( 'headers' => array( 'X-API-KEY-TOKEN' => $key ) );

	// Request
	$request = wp_remote_get( $url, $args );

	if ( is_wp_error( $request ) ) {
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( $request->get_error_message(), true );
		}
		return false; // Bail early
	}

	$body = wp_remote_retrieve_body( $request );

	$api_data = json_decode( $body, true );

	// DEBUG
	if ( BD0019__DEBUG === 1 ) {
		error_log( print_r( $api_data, true ) );
	}

	return $api_data;
}

/**
 * This function should not be called directly!!!
 * ==============================================
 *
 * Get the API data
 * ================
 *
 * Now that we have the device UUID, we can call for
 * the data from the device.
 *
 * We must never call this function directly! Instead, we must
 * retrieve the data we have stored in our custom database table (see
 * "database.php"). This function is only used to update the
 * table.
 *
 */

function bd_foobot_call_api_sensors( $uuid ) {
		// DEBUG
	if ( BD0019__DEBUG === 1 ) {
		error_log( sprintf( 'New API call made for %s.', $uuid ) );
	}

	$key = bd_foobot_get_api_key();

	$url  = 'https://api.foobot.io/v2/device/' . $uuid . '/datapoint/0/last/0/';
	$args = array(
		'headers' => array(
			'X-API-KEY-TOKEN' => $key,
		),
	);

	$request = wp_remote_get( $url, $args );

	if ( is_wp_error( $request ) ) {
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( print_r( $request->get_error_message(), true ) );
		}
		return false; // Bail early
	}

	$body = wp_remote_retrieve_body( $request );

	$api_data = json_decode( $body, true ); // Output array

	// DEBUG
	if ( BD0019__DEBUG === 1 ) {
		error_log( print_r( $api_data, true ) );
	}

	return $api_data;
}

/**
 * Get device names and UUIDs
 *
 * Use this function to request device data.
 * Uses transients to avoid repeated requests
 * hitting API limit.
 *
 * @return  array    $output           Device data (name, UUID)
 */
function bd_foobot_call_api_trans_devices() {
	// Vars
	$output       = '';
	$transient_id = 'foobot-api-device-updated';
	$transient    = get_transient( $transient_id );
	$expiry       = 86400; // 24 hours

	// Check if transient already set / not expired
	// If set, return.
	if ( 1 === $transient ) { // Transient set.
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( sprintf( 'Transient %s set. No API call made.', $transient_id ) );
		}
		return;
	} else {
		// Get the device data via new API call
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( sprintf( 'New API call made for devices.' ) );
		}
		$data = bd_foobot_call_api_devices();

		if ( is_wp_error( $data ) ) {
			return; // Bail early
		} else {
			$output = $data;
		}

		// Set a transient
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( sprintf( 'Setting transient %s.', $transient_id ) );
		}
		set_transient( $transient_id, 1, $expiry );
	}
	return $output;
}

/**
 * Get sensor data
 *
 * Use this function to request sensor data from a specified device.
 * Uses transients to avoid repeated requests
 * hitting API limit.
 *
 * @param   string   $uuid             UUID of device
 * @return  array    $output           Sensor data
 */
function bd_foobot_call_api_trans_sensors( $uuid ) {
	// Vars
	$output       = '';
	$transient_id = 'foobot-api-data-updated-' . $uuid;
	$transient    = get_transient( $transient_id );
	$expiry       = 600; // 10 mins

	// Check if transient already set / not expired
	// If set, return.
	if ( 1 === $transient ) { // Transient set.
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( sprintf( 'Transient %s set for UUID %s. No API call made.', $transient_id, $uuid ) );
		}
		return;
	} else {
		// Get the device data via new API call
		$data = bd_foobot_call_api_sensors( $uuid );

		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( print_r( $data, true ) );
		}

		if ( is_wp_error( $data ) ) {
			return; // Bail early
		} else {
			$output = $data;
		}

		// Set a transient
		// DEBUG
		if ( BD0019__DEBUG === 1 ) {
			error_log( sprintf( 'Setting transient %s.', $transient_id ) );
		}
		set_transient( $transient_id, 1, $expiry );
	}
	return $output;
}