"""
==================================================
Automatic Fiber Bundle Extraction with RecoBundles
==================================================

This example explains how we can use RecoBundles [Garyfallidis17]_ to extract
bundles from tractograms.

First import the necessary modules.
"""

import numpy as np

from dipy.align.streamlinear import whole_brain_slr
from dipy.data import get_two_hcp842_bundles
from dipy.data import (fetch_target_tractogram_hcp,
                       fetch_bundle_atlas_hcp842,
                       get_bundle_atlas_hcp842,
                       get_target_tractogram_hcp)
from dipy.io.stateful_tractogram import Space, StatefulTractogram
from dipy.io.streamline import load_trk, save_trk
from dipy.io.utils import create_tractogram_header
from dipy.segment.bundles import RecoBundles
from dipy.viz import actor, window


"""
Download and read data for this tutorial
"""


target_file, target_folder = fetch_target_tractogram_hcp()
atlas_file, atlas_folder = fetch_bundle_atlas_hcp842()

atlas_file, all_bundles_files = get_bundle_atlas_hcp842()
target_file = get_target_tractogram_hcp()

sft_atlas = load_trk(atlas_file, "same", bbox_valid_check=False)
atlas = sft_atlas.streamlines
atlas_header = create_tractogram_header(atlas_file,
                                        *sft_atlas.space_attributes)

sft_target = load_trk(target_file, "same", bbox_valid_check=False)
target = sft_target.streamlines
target_header = create_tractogram_header(target_file,
                                         *sft_target.space_attributes)

"""
let's visualize atlas tractogram and target tractogram before registration
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(atlas, colors=(1, 0, 1)))
scene.add(actor.line(target, colors=(1, 1, 0)))
window.record(scene, out_path='tractograms_initial.png', size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: tractograms_initial.png
   :align: center

   Atlas and target before registration.

"""

"""
We will register target tractogram to model atlas' space using streamlinear
registration (SLR) [Garyfallidis15]_
"""

moved, transform, qb_centroids1, qb_centroids2 = whole_brain_slr(
    atlas, target, x0='affine', verbose=True, progressive=True,
    rng=np.random.RandomState(1984))


"""
We save the transform generated in this registration, so that we can use
it in the bundle profiles example
"""

np.save("slr_transform.npy", transform)


"""
let's visualize atlas tractogram and target tractogram after registration
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(atlas, colors=(1, 0, 1)))
scene.add(actor.line(moved, colors=(1, 1, 0)))
window.record(scene, out_path='tractograms_after_registration.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: tractograms_after_registration.png
   :align: center

   Atlas and target after registration.

"""


"""
Extracting bundles using RecoBundles [Garyfallidis17]_

RecoBundles requires a model (reference) bundle and tries to extract similar
looking bundle from the input tractogram. There are some key parameters that
users can set as per requirements. Here are the key threshold parameters
measured in millimeters and their function in Recobundles:

    - model_clust_thr : It will use QuickBundles to get the centroids of the
    model bundle and work with centroids instead of all streamlines. This helps
    to make RecoBundles faster. The larger the value of the threshold, the
    fewer centroids will be, the and smaller the threshold value, the more
    centroids will be. If you prefer to use all the streamlines of the model
    bundle, you can set this threshold to 0.01 mm.
    Recommended range of the model_clust_thr is 0.01 - 3.0 mm.

    - reduction_thr : This threshold will be used to reduce the search space
    for finding the streamlines that match model bundle streamlines in shape.
    Instead of looking at the entire tractogram, now we will be looking at
    neighboring region of a model bundle in the tractogram. Increase the
    threshold to increase the search space.
    Recommended range of the reduction_thr is 15 - 30 mm.

    - pruning_thr : This threshold will filter the streamlines for which the
    distance to the model bundle is greater than the pruning_thr.
    This serves to filter the neighborhood area (search space) to get
    streamlines that are like the model bundle.
    Recommended range of the pruning_thr is 8 - 12 mm.

    - reduction_distance and pruning_distance : Distance method used internally.
    Minimum Diferect Flip distance (mdf) or Mean Average Minimum (mam).
    Default is set to mdf.

    - slr : If slr flag is set to True, local registration of model bundle with
    neighbouring area will be performed. Default and recommended is True.
"""

"""
Read Arcuate Fasciculus Left and Corticospinal Tract Left bundles from already
fetched atlas data to use them as model bundle. Let's visualize the
Arcuate Fasciculus Left model bundle.
"""

model_af_l_file, model_cst_l_file = get_two_hcp842_bundles()
sft_af_l = load_trk(model_af_l_file, "same", bbox_valid_check=False)
model_af_l = sft_af_l.streamlines

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(model_af_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='AF_L_model_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: AF_L_model_bundle.png
   :align: center

   Model Arcuate Fasciculus Left bundle

"""


rb = RecoBundles(moved, verbose=True, rng=np.random.RandomState(2001))

recognized_af_l, af_l_labels = rb.recognize(model_bundle=model_af_l,
                                            model_clust_thr=0.1,
                                            reduction_thr=15,
                                            pruning_thr=7,
                                            reduction_distance='mdf',
                                            pruning_distance='mdf',
                                            slr=True)

"""
let's visualize extracted Arcuate Fasciculus Left bundle
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_af_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='AF_L_recognized_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: AF_L_recognized_bundle.png
   :align: center

   Extracted Arcuate Fasciculus Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_af_l = StatefulTractogram(recognized_af_l, atlas_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_rec_1.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_af_l = StatefulTractogram(target[af_l_labels], target_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_org_1.trk", bbox_valid_check=False)


"""

Now, let's increase the reduction_thr and pruning_thr values.

"""

recognized_af_l, af_l_labels = rb.recognize(model_bundle=model_af_l,
                                            model_clust_thr=0.1,
                                            reduction_thr=20,
                                            pruning_thr=10,
                                            reduction_distance='mdf',
                                            pruning_distance='mdf',
                                            slr=True)

"""
let's visualize extracted Arcuate Fasciculus Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_af_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='AF_L_recognized_bundle2.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: AF_L_recognized_bundle2.png
   :align: center

   Extracted Arcuate Fasciculus Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_af_l = StatefulTractogram(recognized_af_l, atlas_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_rec_2.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_af_l = StatefulTractogram(target[af_l_labels], target_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_org_2.trk", bbox_valid_check=False)

"""

Now, let's increase the reduction_thr and pruning_thr values further.

"""

recognized_af_l, af_l_labels = rb.recognize(model_bundle=model_af_l,
                                            model_clust_thr=0.1,
                                            reduction_thr=25,
                                            pruning_thr=12,
                                            reduction_distance='mdf',
                                            pruning_distance='mdf',
                                            slr=True)

"""
let's visualize extracted Arcuate Fasciculus Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_af_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='AF_L_recognized_bundle3.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: AF_L_recognized_bundle3.png
   :align: center

   Extracted Arcuate Fasciculus Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_af_l = StatefulTractogram(recognized_af_l, atlas_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_rec_3.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_af_l = StatefulTractogram(target[af_l_labels], target_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_org_3.trk", bbox_valid_check=False)


"""
Let's apply auto-calibrated RecoBundles on the output of standard RecoBundles.
This step will filter out the outlier streamlines. This time, the RecoBundles'
extracted bundle will serve as a model bundle. As a rule of thumb, provide
larger threshold values in standard RecoBundles function and smaller values in
the auto-calibrated RecoBundles (refinement) step.

"""

r_recognized_af_l, r_af_l_labels = rb.refine(model_bundle=model_af_l,
                                             pruned_streamlines=recognized_af_l,
                                             model_clust_thr=0.1,
                                             reduction_thr=15,
                                             pruning_thr=6,
                                             reduction_distance='mdf',
                                             pruning_distance='mdf',
                                             slr=True)

"""
let's visualize extracted refined Arcuate Fasciculus Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(r_recognized_af_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='AF_L_refine_recognized_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: AF_L_refine_recognized_bundle.png
   :align: center

   Extracted Arcuate Fasciculus Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_af_l = StatefulTractogram(r_recognized_af_l, atlas_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_rec_refine.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_af_l = StatefulTractogram(target[r_af_l_labels], target_header,
                               Space.RASMM)
save_trk(reco_af_l, "AF_L_org_refine.trk", bbox_valid_check=False)


"""
Let's load Corticospinal Tract Left model bundle and visualize it.
"""

sft_cst_l = load_trk(model_cst_l_file, "same", bbox_valid_check=False)
model_cst_l = sft_cst_l.streamlines

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(model_cst_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='CST_L_model_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: CST_L_model_bundle.png
   :align: center

   The Corticospinal tract model bundle

"""

recognized_cst_l, cst_l_labels = rb.recognize(model_bundle=model_cst_l,
                                              model_clust_thr=0.1,
                                              reduction_thr=15,
                                              pruning_thr=7,
                                              reduction_distance='mdf',
                                              pruning_distance='mdf',
                                              slr=True)

"""
let's visualize extracted Corticospinal tract Left bundle
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_cst_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='CST_L_recognized_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: CST_L_recognized_bundle.png
   :align: center

   Extracted Corticospinal tract Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_cst_l = StatefulTractogram(recognized_cst_l, atlas_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_rec_1.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_cst_l = StatefulTractogram(target[cst_l_labels], target_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_org_1.trk", bbox_valid_check=False)


"""

Now, let's increase the reduction_thr and pruning_thr values.

"""

recognized_cst_l, cst_l_labels = rb.recognize(model_bundle=model_cst_l,
                                              model_clust_thr=0.1,
                                              reduction_thr=20,
                                              pruning_thr=10,
                                              reduction_distance='mdf',
                                              pruning_distance='mdf',
                                              slr=True)

"""
let's visualize extracted Corticospinal tract Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_cst_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='CST_L_recognized_bundle2.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: CST_L_recognized_bundle2.png
   :align: center

   Extracted Corticospinal tract Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_cst_l = StatefulTractogram(recognized_cst_l, atlas_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_rec_2.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_cst_l = StatefulTractogram(target[cst_l_labels], target_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_org_2.trk", bbox_valid_check=False)


"""

Now, let's increase the reduction_thr and pruning_thr values further.

"""

recognized_cst_l, cst_l_labels = rb.recognize(model_bundle=model_cst_l,
                                              model_clust_thr=0.1,
                                              reduction_thr=25,
                                              pruning_thr=12,
                                              reduction_distance='mdf',
                                              pruning_distance='mdf',
                                              slr=True)

"""
let's visualize extracted Corticospinal tract Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(recognized_cst_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='CST_L_recognized_bundle3.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: CST_L_recognized_bundle3.png
   :align: center

   Extracted Corticospinal tract Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_cst_l = StatefulTractogram(recognized_cst_l, atlas_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_rec_3.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_cst_l = StatefulTractogram(target[cst_l_labels], target_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_org_3.trk", bbox_valid_check=False)


"""
Let's apply auto-calibrated RecoBundles on the output of standard RecoBundles.
This step will filter out the outlier streamlines. This time, the RecoBundles'
extracted bundle will serve as a model bundle. As a rule of thumb, provide
larger threshold values in standard RecoBundles function and smaller values in
the auto-calibrated RecoBundles (refinement) step.

"""

r_recognized_cst_l, r_cst_l_labels = rb.refine(
                                     model_bundle=model_cst_l,
                                     pruned_streamlines=recognized_cst_l,
                                     model_clust_thr=0.1,
                                     reduction_thr=15,
                                     pruning_thr=6,
                                     reduction_distance='mdf',
                                     pruning_distance='mdf',
                                     slr=True)

"""
let's visualize extracted refined Corticospinal tract Left bundle.
"""

interactive = False

scene = window.Scene()
scene.SetBackground(1, 1, 1)
scene.add(actor.line(r_recognized_cst_l))
scene.set_camera(focal_point=(-18.17281532, -19.55606842, 6.92485857),
                 position=(-360.11, -30.46, -40.44),
                 view_up=(-0.03, 0.028, 0.89))
window.record(scene, out_path='CST_L_refine_recognized_bundle.png',
              size=(600, 600))
if interactive:
    window.show(scene)

"""
.. figure:: CST_L_refine_recognized_bundle.png
   :align: center

   Extracted refined Corticospinal tract Left bundle

"""

"""

Save the bundle as a trk file. Let's save the recognized bundle in the
common space (atlas space), in this case, MNI space.

"""

reco_cst_l = StatefulTractogram(r_recognized_cst_l, atlas_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_rec_refine.trk", bbox_valid_check=False)

"""

Let's save the recognized bundle in the original space of the subject anatomy.

"""

reco_cst_l = StatefulTractogram(target[r_cst_l_labels], target_header,
                                Space.RASMM)
save_trk(reco_cst_l, "CST_L_org_refine.trk", bbox_valid_check=False)


"""

This example shows how changing different threshold parameters can change the
output. It is up to the user to decide what is the desired output and select
parameters accordingly.

"""


"""

References
----------

.. [Garyfallidis17] Garyfallidis et al. Recognition of white matter
        bundles using local and global streamline-based registration
        and clustering, Neuroimage, 2017.

.. [Chandio2020] Chandio, B.Q., Risacher, S.L., Pestilli, F.,
        Bullock, D., Yeh, FC., Koudoro, S., Rokem, A., Harezlak, J., and
        Garyfallidis, E. Bundle analytics, a computational framework for
        investigating the shapes and profiles of brain pathways across
        populations. Sci Rep 10, 17149 (2020)

"""
