# Autthors: Gurkirat, Addison
# Due Wednesday October 12th
import sound 
import time
 
def rem_vocals(snd):
    #Return a copy of sound with vocals removed
 
    new_snd = sound.copy(snd)
    for sample in new_snd:
        left = sound.get_left(sample)
        right = sound.get_right(sample)
        delete_vocals = (left - right)/2.0
        sound.set_left(sample,int(delete_vocals))
        sound.set_right(sample,int(delete_vocals))
    return new_snd
def fade_in (snd, fade_length):
    #Return a copy of sound with the beginning faded. Number of samples faded is defined by fade_length
 
    '''Return original sound snd with selected number of samples faded in via new_snd'''  
    new_snd2 = sound.copy(snd)
    samps_to_fade = fade_length - 1
    #required due to samples starting at 0, not 1
    index = 0 
    for samp in new_snd2:
        index = sound.get_index(samp)
        if index <= samps_to_fade:
            fade_factor = 1.0 *index/fade_length
            #Tracks number of samples done, is also used as the fade factor
            left2 = (sound.get_left(samp))*fade_factor
            right2 = (sound.get_right(samp))*fade_factor
            sound.set_left(samp, int(left2))
            sound.set_right(samp,int(right2))
    return new_snd2 
def fade_out (snd,fade_length):
    #Return a copy of sound with the end faded. Number of samples faded is defined by fade_length
 
    '''Return original sound snd with selected number of samples faded out via new_snd'''    
    new_snd=sound.copy(snd)
    fade_point= len(snd)-fade_length-1
    #where to start fading
    samp_todo = fade_length 
    #tracks the number of untouched samples
    fade_factor=1.0
    samp_index=0
    for samp in new_snd:
        samp_index=sound.get_index(samp)
        if samp_index>=fade_point: 
            # if we have reached the point to begin fading,then below
            if samp_index == len(snd)-1:
                fade_factor = 0
                #if at last sample, fade factor is set to zero
            fade_factor= ((samp_todo*1.0)/fade_length)
            left = int((sound.get_left(samp))*fade_factor)
            right = int((sound.get_right(samp))*fade_factor)
            sound.set_left(samp, int(left))
            sound.set_right(samp,int(right))
            samp_todo-= 1
 
            #Tracks number of samples done,starts at one and ends at zero
    return new_snd
def fade(snd, fade_length):
    #Returns a copy of sound with the beginning and ending faded.Number of samples faded is defined by fade_legnth
 
    new_snd=sound.copy(snd)
    new_snd=fade_in(new_snd,fade_length)
    new_snd=fade_out(new_snd,fade_length)
    return new_snd
    '''Return original sound snd with selected number of samples 
    faded in and out via new_snd'''
    #new_snd = sound.copy(snd)
    #samps_to_fade_in = fade_length - 1
    #samp_todo = fade_length
    ##tracks the number of untouched samples
    #fade_point_fade_out= len(snd)-fade_length
    #index = 0 
    #fade_factor = 1.0
    #for samp in new_snd:
        #samp_index=sound.get_index(samp)
        #if samp_index <= samps_to_fade_in:
            #fade_factor = 1.0 *samp_index/fade_length
            #left2 = (sound.get_left(samp))*fade_factor
            #right2 = (sound.get_right(samp))*fade_factor
            #sound.set_left(samp, int(left2))
            #sound.set_right(samp,int(right2))
        #if samp_index>=fade_point_fade_out :
            #if samp_index == len(snd)-1:
                #fade_factor = 0
            #left = int((sound.get_left(samp))*fade_factor)
            #right = int((sound.get_right(samp))*fade_factor)
            #sound.set_left(samp, int(left))
            #sound.set_right(samp,int(right))
            #samp_todo-=1
            #fade_factor= ((samp_todo*1.0)/fade_length)
    #return new_snd
 
def left_to_right (snd, pan_length):
    #Returns a copy of sound with panning applied to it. Left starts at 0,right starts at max
    '''Return original sound snd with selected samples panned to the right
    and others to the left via new_snd'''
    new_snd= sound.copy(snd)
    samps_to_pan = pan_length - 1
    index = 0 
    fade_factor_left = 0.0
    fade_factor_right=0.0
    for samp in new_snd :
        if index <= samps_to_pan :
            left = sound.get_left(samp)
            right = sound.get_right(samp)
            avg= (left+right)/2.0
            fade_factor_left = ((index*1.0)/samps_to_pan)
            fade_factor_right= 1-fade_factor_left
            left = int(avg*fade_factor_left)
            right = int(avg*fade_factor_right)
            sound.set_values(samp,left,right)
            index+=1
    return new_snd
 
if __name__ == "__main__":
    snd = sound.load_sound("love.wav")
    #sound.play(snd) 
    #sound.play(rem_vocals(snd))
    #sound.play(fade_in(snd, 50000))
    #sound.play(fade_out(snd, 70000))
    #sound.play(left_to_right(snd, 500000))
    sound.play(fade(snd,50000))