# Tool to align the solenoid on the gun.
# S. Bettoni, A. Gobbo, D. Voulot
# 06/06/2016
#Code ok with the GUI

# Procedure:
    # switch off all the magnets between the gun solenoid and the screen or BPM used for the measurement
    # change the current of the gun soleoid
    # look at the centroid position (BPM or screen) downstream of the gun.

import datetime
import ch.psi.utils.Chrono as Chrono

mode = "server"  # "server", "camtool", "bpm" or "direct"
camera_name = "simulation"
#camera_name = "SLG-LCAM-C041"
use_good_region=False
dry_run = True

if True: #get_exec_pars().source == CommandSource.ui:
    I1 = 95.0
    I2 = 100.0
    dI = 1.0
    settling_time = 0.1
    plot_image = False    
    number_images = 3
    use_background = True
    multiple_background = True
    number_backgrounds = 3
    do_elog = False    
    centroid_excursion_plot = True
else:
    centroid_excursion_plot = False


#laser_was_on = is_laser_on()
positioner = DummyPositioner("positioner")

original_gun_solenoid = positioner.read()
    

multiple_background = multiple_background and use_background   
print "Parameters: ", I1, I2, dI, settling_time, plot_image, number_images, use_background, multiple_background, number_backgrounds 

plot_name = datetime.datetime.fromtimestamp(time.time()).strftime('%H%M%S')


setup_camera_scan()

#switch_off_magnets()

     
r = None


try:            
    sensors = get_camera_scan_sensors()
    r = lscan(positioner, sensors , I1, I2, dI, settling_time, before_read = before_sample_camera_scan, after_read = after_sample_camera_scan)
finally:
     end_camera_scan()

positioner.write(original_gun_solenoid)
#if laser_was_on:
#    laser_on()
#else:
#    laser_off()


# take the result of the scan and generate convex hull plot
if centroid_excursion_plot:
    (hx,hy)=add_convex_hull_plot ("Centroid excursion", r.getReadable(0),r.getReadable(1), plot_name)
else:   
    (hx,hy)= convex_hull(x=r.getReadable(0), y=r.getReadable(1))
    hx.append(hx[0]); hy.append(hy[0])        

# save the entry in the logbook
gsa_log_msg = "Data file: " + get_exec_pars().path
gsa_log_msg = gsa_log_msg + "\nImages: " + str(number_images)
gsa_log_msg = gsa_log_msg + "\nBackground: enabled=" + str(use_background) + " multiple="  + str(multiple_background) + " number="  + str(number_backgrounds) 
gsa_log_msg = gsa_log_msg + "\n\n" + r.print()
if do_elog:
    elog("Gun solenoid current scan", gsa_log_msg , get_plot_snapshots())

print gsa_log_msg
set_return([r, hx, hy])