
def Akhdefo_resample(input_raster="", output_raster="" , xres=3.125 , yres=3.125, SavFig=False , convert_units=False):
    """
    This program performs raster resampling for multiple rasters
   
    Inputs:

    input_raster="", 

    output_raster="" , 


    xres=3.125 , 

    yres=3.125, 

    SavFig=False

    convert_units=False if True converts raster value units from m to mm
    
    Returns:
    Raster geotif

    """
    from osgeo import gdal
    import numpy as np
    import matplotlib.pyplot as plt
    import seaborn_image as sb
    import rasterio
    import os
   
    ds = gdal.Open(input_raster)

    # resample
    dsRes = gdal.Warp(output_raster, ds, xRes = xres, yRes = yres, 
                    resampleAlg = "bilinear")
    
    dsRes =None 
    ds = None
  
    # # visualize
    src=rasterio.open(output_raster)
    meta= src.meta
    meta.update({'nodata': np.nan})
    array=src.read(1, masked=True)
    # #array = dsRes.GetRasterBand(1).ReadAsArray()
    array[array==-32767.0]=np.nan
    array=array*1000
    plt.figure()
    sb.imghist(array, descibe=True, cmap='Spectral' , orientation='v')
    # plt.colorbar()
    if SavFig==True:
        plt.savefig("resampled.jpg", dpi=300)
    if convert_units==True:
        
        src.close() # close the rasterio dataset
        os.remove(output_raster) # delete the file 
        
        rs=rasterio.open(output_raster, "w+", **meta)
        rs.write(array, indexes=1)
    plt.show()


def Akhdefo_inversion(horizontal_InSAR="", Vertical_InSAR="", EW_Akhdefo="", NS_Akhdefo="", demFile="", output_folder=r""):
    """
    This program calculates 3D displacement velocity (East-West,North-South and vertical) using combined optical and InSAR products
   
    Inputs:

    horizontal_InSAR: path to East Velocity InSAR product in geotif format

    Vertical_InSAR: path to Vertical Velocity InSAR product in geotif format

    EW_Akhdefo: path to east-west velocity  akhdefo(optical) product in geotif format

    NS_Akhdefo: path to north-south velocity  akhdefo(optical) product in geotif format

    demFile: path to DEM raster in geotif format

    output_folder: path to save raster products 

    
    Returns:

    3D-Velocity (D3D in mm/year) raster
    Plunge raster in degrees
    Trend raster in degress


    """
    
    import rasterio as rio
    import numpy as np
    import os
    import cmocean
    from akhdefo_functions.AkhdefoPlot import akhdefo_viewer
    
    
    if not os.path.exists(output_folder ):
        os.makedirs(output_folder)
    #Load images with rasterio
    D_EW_InSAR=rio.open(horizontal_InSAR)
    D_vertical_insar=rio.open(Vertical_InSAR)
    D_EW_akhdefo=rio.open(EW_Akhdefo)
    D_NS_akhdefo=rio.open(NS_Akhdefo)
    #read images with rasterio
    DEW_insar=D_EW_InSAR.read(1, masked=True)
    DEW_insar[DEW_insar==-32767.0]=np.nan
    DEW_insar=DEW_insar*1000

    DEW_akhdefo=D_EW_akhdefo.read(1, masked=True)
    D_vertical=D_vertical_insar.read(1, masked=True)
    D_vertical[D_vertical==-32767.0]=np.nan
    D_vertical=D_vertical*1000

    DNS_akhdefo=D_NS_akhdefo.read(1, masked=True)

    print (DEW_akhdefo.shape)
    print(D_vertical.shape)
    print (DEW_akhdefo.shape)
    print(DEW_insar.shape)
    DH=np.hypot(DEW_akhdefo, DNS_akhdefo)
    D3D=np.hypot(DH, D_vertical )

    meta=D_EW_InSAR.meta

    trend_radians=np.arcsin(DNS_akhdefo/DH)
    trend_degrees=np.degrees(trend_radians)
    print ("Trend in degree raw data: ", trend_degrees.min(), trend_degrees.max())
    trend_degrees=(450 - trend_degrees ) % 360

    plung_radians=np.arcsin(D_vertical/D3D)
    plung_degree=np.degrees(plung_radians)
    #plung_degree=(90-plung_degree)% 90

    print ("DH: ", DH.max(), DH.min())
    print("D3D: ", D3D.max(), D3D.min())

    #Save products
    _3D_vel=output_folder + "/" + "D3D.tif"
    plung=output_folder+ "/" + "plung_degree.tif"
    trend=output_folder+ "/" + "trend_degrees.tif"
    # with rio.open("DH.tif", 'w', **meta) as dst:
    #         dst.write(DH, indexes=1)
    with rio.open(_3D_vel, 'w', **meta) as dst:
            dst.write(D3D, indexes=1)
    with rio.open(trend, 'w', **meta) as dst:
            dst.write(trend_degrees, indexes=1)
    with rio.open(plung, 'w', **meta) as dst:
            dst.write(plung_degree, indexes=1)


    
    p1=akhdefo_viewer(Path_to_DEMFile=demFile, rasterfile=_3D_vel , cbar_label="mm/year", title="3D Velocity", pixel_resolution_meter=3.125, outputfolder=output_folder,
    outputfileName="3D_Disp.jpg", unit=1, cmap=cmocean.cm.speed, alpha=0.8, noDATA_Mask=True, Normalize=True)
    p2=akhdefo_viewer(Path_to_DEMFile=demFile, rasterfile=plung , cbar_label="degrees", title="Plunge of Dispalcement Velocity", pixel_resolution_meter=3.125, outputfolder=output_folder,
    outputfileName="plunge.jpg", unit=1, cmap=cmocean.cm.delta, alpha=0.8, noDATA_Mask=True, Normalize=True)
    p3=akhdefo_viewer(Path_to_DEMFile=demFile, rasterfile=trend , cbar_label="degress", title="Trend of Dispalcement Velocity", pixel_resolution_meter=3.125, outputfolder=output_folder,
    outputfileName="trend.jpg", unit=1, cmap=cmocean.cm.phase, alpha=0.8, noDATA_Mask=True, Normalize=True)


def Auto_Variogram(path_to_shapefile=r"", column_attribute="", latlon=False):  
    '''
    path_to_shapefile: type path to shapefile to include data (point data)
    the shapefile attribute must have x, y or lat, lon columns
    
    column_attribute: Name of shapefile field attribute include data
    
    '''
    import numpy as np
    from matplotlib import pyplot as plt
    import gstools as gs
    import geopandas as gpd  
    
    geodata=gpd.read_file(path_to_shapefile)
    
    
    ###############################################################################
    # Estimate the variogram of the field with automatic bins and plot the result.
    from Akhdefo_Tools import utm_to_latlon
    
    if latlon==True:
        geographic=utm_to_latlon(easting=geodata.x, northing=geodata.y, zone_number=10, zone_letter="N")
        x=geographic[0]
        y=geographic[1]
        z=geodata[column_attribute]
    else:
        x=geodata.x 
        y=geodata.y
        z=geodata[column_attribute]
    bin_center, gamma = gs.vario_estimate((x, y), z, latlon=latlon)

    ###############################################################################
    # Define a set of models to test.

    models = {
        "Gaussian": gs.Gaussian,
        "Exponential": gs.Exponential,
        "Matern": gs.Matern,
        "Stable": gs.Stable,
        "Rational": gs.Rational,
        "Circular": gs.Circular,
        "Spherical": gs.Spherical,
        "SuperSpherical": gs.SuperSpherical,
        "JBessel": gs.JBessel,
    }
    scores = {}

    ###############################################################################
    # Iterate over all models, fit their variogram and calculate the r2 score.
    fig, (ax1,ax2,ax3)=plt.subplots(ncols=1, nrows=3, figsize=(10,10))
    # plot the estimated variogram
    ax1.scatter(bin_center, gamma, color="k", label="data")
    #ax = plt.gca()

    # fit all models to the estimated variogram
    for idx, model in enumerate(models):
        fit_model = models[model](dim=2, len_scale=4, anis=0.2, angles=-0.5, var=0.5, nugget=0.1)
        para, pcov, r2 = fit_model.fit_variogram(bin_center, gamma, return_r2=True)
        fit_model.plot(x_max=max(bin_center), ax=ax1)
        scores[model] = r2
        ax1.legend()
        
                
    ###############################################################################
    # Create a ranking based on the score and determine the best models

    ranking = sorted(scores.items(), key=lambda item: item[1], reverse=True)
    print("RANKING by Pseudo-r2 score", max(scores, key=scores.get))
    
    for i, (model, score) in enumerate(ranking, 1):
        print(f"{i:>6}. {model:>15}: {score:.5}")
       
    
    max_score=max(scores, key=scores.get)
    for idx, model in enumerate(models):
    
        if max_score==list(models)[idx]:
            fit_model = models[model](dim=2, len_scale=4, anis=0.2, angles=-0.5, var=0.5, nugget=0.1)
            fit_model.plot(x_max=max(bin_center), ax=ax2)
            ax2.set_title(max_score)
            ax2.legend()
            
            import pykrige.kriging_tools as kt
            from pykrige.ok import OrdinaryKriging

            # a GSTools based covariance model
            #model_var = gs.models[model](dim=2, len_scale=4, anis=0.2, angles=-0.5, var=0.5, nugget=0.1)
            if latlon==True: 
                gridx = np.arange((x.min()), x.max(), 0.2)
                gridy = np.arange(y.min(), y.max(), 0.2)
            else: 
                gridx = np.arange(geodata.x.min(),geodata.x.max(), 10)
                gridy = np.arange(geodata.y.min(), geodata.y.max(), 10)
            OK1 = OrdinaryKriging(geodata.x, geodata.y, geodata[column_attribute], fit_model)
            z1, ss1 = OK1.execute("grid", gridx, gridy)
            ax3.set_title((model))
            img=ax3.imshow(z1[z1!=0], origin="lower", cmap='Spectral')
            fig.colorbar(img, ax=ax3)
            
    fig.show()
    
    return (max(scores, key=scores.get),bin_center, gamma )