"""
Stitching sample (advanced)
===========================

Show how to use Stitcher API from python.
"""

# Python 2/3 compatibility
from __future__ import print_function

import argparse

import cv2 as cv
import numpy as np

from opencv_stitching.stitcher import Stitcher

from opencv_stitching.image_handler import ImageHandler
from opencv_stitching.feature_detector import FeatureDetector
from opencv_stitching.feature_matcher import FeatureMatcher
from opencv_stitching.subsetter import Subsetter
from opencv_stitching.camera_estimator import CameraEstimator
from opencv_stitching.camera_adjuster import CameraAdjuster
from opencv_stitching.camera_wave_corrector import WaveCorrector
from opencv_stitching.warper import Warper
from opencv_stitching.exposure_error_compensator import ExposureErrorCompensator  # noqa
from opencv_stitching.seam_finder import SeamFinder
from opencv_stitching.blender import Blender
from opencv_stitching.timelapser import Timelapser

parser = argparse.ArgumentParser(
    prog="opencv_stitching_tool.py",
    description="Rotation model images stitcher"
)
parser.add_argument(
    'img_names', nargs='+',
    help="Files to stitch", type=str
)
parser.add_argument(
    '--medium_megapix', action='store',
    default=ImageHandler.DEFAULT_MEDIUM_MEGAPIX,
    help="Resolution for image registration step. "
    "The default is %s Mpx" % ImageHandler.DEFAULT_MEDIUM_MEGAPIX,
    type=float, dest='medium_megapix'
)
parser.add_argument(
    '--detector', action='store',
    default=FeatureDetector.DEFAULT_DETECTOR,
    help="Type of features used for images matching. "
         "The default is '%s'." % FeatureDetector.DEFAULT_DETECTOR,
    choices=FeatureDetector.DETECTOR_CHOICES.keys(),
    type=str, dest='detector'
)
parser.add_argument(
    '--nfeatures', action='store',
    default=500,
    help="Type of features used for images matching. "
         "The default is 500.",
    type=int, dest='nfeatures'
)
parser.add_argument(
    '--matcher_type', action='store', default=FeatureMatcher.DEFAULT_MATCHER,
    help="Matcher used for pairwise image matching. "
         "The default is '%s'." % FeatureMatcher.DEFAULT_MATCHER,
    choices=FeatureMatcher.MATCHER_CHOICES,
    type=str, dest='matcher_type'
)
parser.add_argument(
    '--range_width', action='store',
    default=FeatureMatcher.DEFAULT_RANGE_WIDTH,
    help="uses range_width to limit number of images to match with.",
    type=int, dest='range_width'
)
parser.add_argument(
    '--try_use_gpu',
    action='store',
    default=False,
    help="Try to use CUDA. The default value is no. "
         "All default values are for CPU mode.",
    type=bool, dest='try_use_gpu'
)
parser.add_argument(
    '--match_conf', action='store',
    help="Confidence for feature matching step. "
         "The default is 0.3 for ORB and 0.65 for other feature types.",
    type=float, dest='match_conf'
)
parser.add_argument(
    '--confidence_threshold', action='store',
    default=Subsetter.DEFAULT_CONFIDENCE_THRESHOLD,
    help="Threshold for two images are from the same panorama confidence. "
         "The default is '%s'." % Subsetter.DEFAULT_CONFIDENCE_THRESHOLD,
    type=float, dest='confidence_threshold'
)
parser.add_argument(
    '--matches_graph_dot_file', action='store',
    default=Subsetter.DEFAULT_MATCHES_GRAPH_DOT_FILE,
    help="Save matches graph represented in DOT language to <file_name> file.",
    type=str, dest='matches_graph_dot_file'
)
parser.add_argument(
    '--estimator', action='store',
    default=CameraEstimator.DEFAULT_CAMERA_ESTIMATOR,
    help="Type of estimator used for transformation estimation. "
         "The default is '%s'." % CameraEstimator.DEFAULT_CAMERA_ESTIMATOR,
    choices=CameraEstimator.CAMERA_ESTIMATOR_CHOICES.keys(),
    type=str, dest='estimator'
)
parser.add_argument(
    '--adjuster', action='store',
    default=CameraAdjuster.DEFAULT_CAMERA_ADJUSTER,
    help="Bundle adjustment cost function. "
         "The default is '%s'." % CameraAdjuster.DEFAULT_CAMERA_ADJUSTER,
    choices=CameraAdjuster.CAMERA_ADJUSTER_CHOICES.keys(),
    type=str, dest='adjuster'
)
parser.add_argument(
    '--refinement_mask', action='store',
    default=CameraAdjuster.DEFAULT_REFINEMENT_MASK,
    help="Set refinement mask for bundle adjustment. It looks like 'x_xxx', "
         "where 'x' means refine respective parameter and '_' means don't "
         "refine, and has the following format:<fx><skew><ppx><aspect><ppy>. "
         "The default mask is '%s'. "
         "If bundle adjustment doesn't support estimation of selected "
         "parameter then the respective flag is ignored."
         "" % CameraAdjuster.DEFAULT_REFINEMENT_MASK,
    type=str, dest='refinement_mask'
)
parser.add_argument(
    '--wave_correct_kind', action='store',
    default=WaveCorrector.DEFAULT_WAVE_CORRECTION,
    help="Perform wave effect correction. "
         "The default is '%s'" % WaveCorrector.DEFAULT_WAVE_CORRECTION,
    choices=WaveCorrector.WAVE_CORRECT_CHOICES.keys(),
    type=str, dest='wave_correct_kind'
)
parser.add_argument(
    '--warper_type', action='store', default=Warper.DEFAULT_WARP_TYPE,
    help="Warp surface type. The default is '%s'." % Warper.DEFAULT_WARP_TYPE,
    choices=Warper.WARP_TYPE_CHOICES,
    type=str, dest='warper_type'
)
parser.add_argument(
    '--low_megapix', action='store', default=ImageHandler.DEFAULT_LOW_MEGAPIX,
    help="Resolution for seam estimation and exposure estimation step. "
    "The default is %s Mpx." % ImageHandler.DEFAULT_LOW_MEGAPIX,
    type=float, dest='low_megapix'
)
parser.add_argument(
    '--compensator', action='store',
    default=ExposureErrorCompensator.DEFAULT_COMPENSATOR,
    help="Exposure compensation method. "
         "The default is '%s'." % ExposureErrorCompensator.DEFAULT_COMPENSATOR,
    choices=ExposureErrorCompensator.COMPENSATOR_CHOICES.keys(),
    type=str, dest='compensator'
)
parser.add_argument(
    '--nr_feeds', action='store',
    default=ExposureErrorCompensator.DEFAULT_NR_FEEDS,
    help="Number of exposure compensation feed.",
    type=np.int32, dest='nr_feeds'
)
parser.add_argument(
    '--block_size', action='store',
    default=ExposureErrorCompensator.DEFAULT_BLOCK_SIZE,
    help="BLock size in pixels used by the exposure compensator. "
         "The default is '%s'." % ExposureErrorCompensator.DEFAULT_BLOCK_SIZE,
    type=np.int32, dest='block_size'
)
parser.add_argument(
    '--finder', action='store', default=SeamFinder.DEFAULT_SEAM_FINDER,
    help="Seam estimation method. "
         "The default is '%s'." % SeamFinder.DEFAULT_SEAM_FINDER,
    choices=SeamFinder.SEAM_FINDER_CHOICES.keys(),
    type=str, dest='finder'
)
parser.add_argument(
    '--final_megapix', action='store',
    default=ImageHandler.DEFAULT_FINAL_MEGAPIX,
    help="Resolution for compositing step. Use -1 for original resolution. "
         "The default is %s" % ImageHandler.DEFAULT_FINAL_MEGAPIX,
    type=float, dest='final_megapix'
)
parser.add_argument(
    '--blender_type', action='store', default=Blender.DEFAULT_BLENDER,
    help="Blending method. The default is '%s'." % Blender.DEFAULT_BLENDER,
    choices=Blender.BLENDER_CHOICES,
    type=str, dest='blender_type'
)
parser.add_argument(
    '--blend_strength', action='store', default=Blender.DEFAULT_BLEND_STRENGTH,
    help="Blending strength from [0,100] range. "
         "The default is '%s'." % Blender.DEFAULT_BLEND_STRENGTH,
    type=np.int32, dest='blend_strength'
)
parser.add_argument(
    '--timelapse', action='store', default=Timelapser.DEFAULT_TIMELAPSE,
    help="Output warped images separately as frames of a time lapse movie, "
         "with 'fixed_' prepended to input file names. "
         "The default is '%s'." % Timelapser.DEFAULT_TIMELAPSE,
    choices=Timelapser.TIMELAPSE_CHOICES,
    type=str, dest='timelapse'
)
parser.add_argument(
    '--output', action='store', default='result.jpg',
    help="The default is 'result.jpg'",
    type=str, dest='output'
)

__doc__ += '\n' + parser.format_help()

if __name__ == '__main__':
    print(__doc__)
    args = parser.parse_args()
    args_dict = vars(args)

    # Extract In- and Output
    img_names = args_dict.pop("img_names")
    img_names = [cv.samples.findFile(img_name) for img_name in img_names]
    output = args_dict.pop("output")

    stitcher = Stitcher(**args_dict)
    panorama = stitcher.stitch(img_names)

    cv.imwrite(output, panorama)

    zoom_x = 600.0 / panorama.shape[1]
    preview = cv.resize(panorama, dsize=None, fx=zoom_x, fy=zoom_x)

    cv.imshow(output, preview)
    cv.waitKey()
    cv.destroyAllWindows()