(in-package #:chatikbot)

(defparameter +udmx-vendor-id+ #x16C0 "VOTI")
(defparameter +udmx-product-id+ #x05DC "Obdev's free shared PID")

(defparameter +udmx-req-set-single-channel+ 1 "usb request for cmd_SetSingleChannel:
        bmRequestType:	ignored by device, should be USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT
        bRequest:		cmd_SetSingleChannel
        wValue:			value of channel to set [0 .. 255]
        wIndex:			channel index to set [0 .. 511]
        wLength:		ignored")

(defparameter +udmx-req-set-channel-range+ 2 "usb request for cmd_SetChannelRange:
              bmRequestType:	ignored by device, should be USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT
              bRequest:		cmd_SetChannelRange
              wValue:			number of channels to set [1 .. 512-wIndex]
              wIndex:			index of first channel to set [0 .. 511]
              wLength:		length of data, must be >= wValue")

(defparameter +udmx-req-start-bootloader+ #xf8 "Start Bootloader for Software updates")

(defparameter +udmx-err-bad-channel+ 1)
(defparameter +udmx-err-bad-value+ 2)

(defparameter +udmx-timeout+ 5000)

(defparameter +udmx-manufacturer+ "www.anyma.ch")
(defparameter +udmx-product+ "uDMX")

(defun udmx-find-device ()
  (loop for device in (cl-libusb:usb-get-devices-by-ids +udmx-vendor-id+ +udmx-product-id+)
     do (unwind-protect
             (progn
               (cl-libusb:usb-open device)
               (when (and (equal (cl-libusb:usb-get-string device :manufacturer) +udmx-manufacturer+)
                          (equal (cl-libusb:usb-get-string device :product) +udmx-product+))
                 (return device)))
          (when (cl-libusb:usb-open-p device)
            (cl-libusb:usb-close device)))))

(defparameter +udmx-request-type+
  (logior (cffi:foreign-enum-value 'libusb-ffi::type :vendor)
          (cffi:foreign-enum-value 'libusb-ffi::recip :device)
          (cffi:foreign-enum-value 'libusb-ffi::endpoint :out)))

(defun %udmx-set-single-channel (device channel value)
  (declare (type (integer 0 511) channel)
           (type (integer 0 255) value))
  (static-vectors:with-static-vector (buffer 1)
    (cl-libusb:usb-control-msg device +udmx-request-type+ +udmx-req-set-single-channel+
                               value channel buffer +udmx-timeout+)))

(defun %udmx-set-channel-range (device first-channel values)
  (declare (type (integer 0 511) first-channel))
  (static-vectors:with-static-vector (buffer (length values) :initial-contents values)
    (cl-libusb:usb-control-msg device +udmx-request-type+ +udmx-req-set-channel-range+
                               (length buffer) first-channel buffer +udmx-timeout+)))

(defun udmx-set-channel (device channel value &rest more-values)
  (unless (cl-libusb:usb-open-p device)
    (cl-libusb:usb-open device))
  (loop for retries from 0 to 100
     do (ignore-errors
          (return (values (if (consp more-values)
                              (%udmx-set-channel-range device channel (cons value more-values))
                              (%udmx-set-single-channel device channel value))
                          retries)))
     finally (return (values nil retries))))