'''
PANCO suite
Adriano Tullo - v.0.1 - 06/06/2024
INAF OAPd
'''

from osgeo import gdal, ogr, osr, gdal_array
import pandas as pd
import numpy as np
import geopandas
import matplotlib.pyplot as plt


def pansharpenIHS(hiri_input, cas_input, outputName="outputIHS.tif", band1=1, band2=2, band3=3):

    #1/3
    red_Weight = 0.3333
    green_Weight = 0.3333
    blue_Weight = 0.3333
    NIR_Weight = 0


    hiriInfo = gdal.Open(hiri_input)

    trgPxColumns = hiriInfo.RasterXSize
    trgPxRows = hiriInfo.RasterYSize
    print(f"Columns: {trgPxColumns}, Rows: {trgPxRows}")

    temp_cas = "temp_out.tif"
    gdal.Translate(temp_cas, cas_input, format="GTiff", outputType=gdal.gdalconst.GDT_Float32, width=trgPxColumns,
                   height=trgPxRows)

    rasterArray1 = gdal_array.LoadFile(temp_cas, band_list=[band1])
    rasterArray1[rasterArray1 > 2] = np.nan
    rasterArray2 = gdal_array.LoadFile(temp_cas, band_list=[band2])
    rasterArray2[rasterArray2 > 2] = np.nan
    rasterArray3 = gdal_array.LoadFile(temp_cas, band_list=[band3])
    rasterArray3[rasterArray3 > 2] = np.nan

    rasterArrayHiri = gdal_array.LoadFile(hiri_input, band_list=[1])


    #synthetic intensity component I
    i_r = np.multiply(rasterArray1, red_Weight)
    i_g = np.multiply(rasterArray2, green_Weight)
    i_b = np.multiply(rasterArray3, blue_Weight)

    intensity_image = np.sum((i_r,i_g,i_b), axis=0, dtype=np.float32)


    # Detail image P - I
    detail_Image = np.subtract(rasterArrayHiri, intensity_image, dtype=np.float32)

    red_out = np.nansum((rasterArray1, detail_Image), axis=0, dtype=np.float32)
    gre_out = np.nansum((rasterArray2, detail_Image), axis=0, dtype=np.float32)
    blu_out = np.nansum((rasterArray3, detail_Image), axis=0, dtype=np.float32)

    stacked_array = np.stack([red_out, gre_out, blu_out], axis=0)

    driver = gdal.GetDriverByName('GTiff')
    n, rows, cols = stacked_array.shape
    dataset = driver.Create(outputName, cols, rows, n,
                            gdal.GDT_Float32)

    for b in range(1, n + 1):
        band = dataset.GetRasterBand(b)  # GetRasterBand is not zero indexed
        band.WriteArray(stacked_array[b - 1])  # Numpy is zero indexed

    dataset = None
    stacked_array = None

    temp_cas_Open = gdal.Open(temp_cas)
    out_cas_Open = gdal.Open(outputName)

    gdal_array.CopyDatasetInfo(temp_cas_Open, out_cas_Open)
    temp_cas_Open = out_cas_Open = None


if __name__ == '__main__':
    hiri_input = r"\path\to\hirisefile.tif"
    cas_input = r"\path\to\cassismosaicfile.tif"
    outputName = r"\path\to\outputfile.tif"
    band1, band2, band3 = 1,2,3

    pansharpenIHS(hiri_input, cas_input, outputName, band1, band2, band3)