# python 3.5
#requires LAStools to be installed (with the appropriate license). Note that LAStools requires no spaces in file names

#should have previously run 2017088_las_manipulation to have a las that has the buildings and veg removed
#note that the neilson volumes script must be in the same folder

# this script will:
#crop to a given polygon (crop away the swash zone)
# extract values along a predefined profile,
# do the volume analysis
#export pngs of the surveys
########################### IMPORTS ###########################################
import os
import io
import subprocess
import pandas as pd
import numpy as np
import neilson_volumes
import matplotlib.pyplot as plt
from matplotlib.ticker import MultipleLocator
import datetime
import xlsxwriter
import math
from cycler import cycler

###############################################################################
########################## FIXED INPUTS #######################################
######### UNCOMMENT THIS SECTION IF YOU WANT TO DEFINE EACH INPUT INDIVIDUALLY ######################
##path to LasTools NOTE THERE CAN BE NO SPACES
path_2_lastools='C:/ProgramData/chocolatey'
# input_file=r"J:\Project\wrl2017088 Central Coast Council Aerial Survey and Coastal Analysis\04_Working\Python\Survey 2\Parameter Files\las outputs survey2.xlsx"
input_file='Parameter Files/las outputs survey2.xlsx'
#input_file=r"J:\Project\wrl2017088 Central Coast Council Aerial Survey and Coastal Analysis\04_Working\Python\Survey 2\Parameter Files\las outputs survey2_V2.xlsx"
##############################
############################### SUB ROUTINES ##################################
def check_output(command,console):

    if console == True:
        process = subprocess.Popen(command)
    else:
        process = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
    output,error = process.communicate()
    returncode = process.poll()

    return returncode,output

def crop_las(las, shp, output, lastools_loc):
    # output is the full path and filename (inc extension) to put in
    path_2_lasclip=lastools_loc+"\\bin\\lasclip"

    command="%s -i %s -poly %s -o %s" % (path_2_lasclip, las, shp, output)

    returncode,output = check_output(command, False)

    if returncode!= 0:
        print("Error. lasclip failed on %s" % shp.split('//')[-1].split('.')[0])
    else:
        return None

def las_boundary(las, crop_poly_name, path_2_crop_polygon, lastools_loc, zone):
    path_2_lasboundary=lastools_loc+"\\bin\\lasboundary"
    fname=crop_poly_name
    prjfname="%s%s.prj" %(path_2_crop_polygon, fname)
    path_2_crop_poly='%s%s.shp' % (path_2_crop_polygon, fname)
    command="%s -i %s -o %s" % (path_2_lasboundary, las, path_2_crop_poly)

    prj=open(prjfname, 'w')
    if zone==56:
        prj.write('PROJCS["GDA_1994_MGA_Zone_56",GEOGCS["GCS_GDA_1994",DATUM["D_GDA_1994",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",153.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]')
    elif zone==55:
        prj.write('PROJCS["GDA_1994_MGA_Zone_55",GEOGCS["GCS_GDA_1994",DATUM["D_GDA_1994",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",147.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]')
    elif zone==57:
        prj.write('PROJCS["GDA_1994_MGA_Zone_57",GEOGCS["GCS_GDA_1994",DATUM["D_GDA_1994",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",159.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]')
    prj.close()

    returncode,output = check_output(command, False)

    return None

def make_raster(las, output, lastools_loc, keep_only_ground=False, step=0.2):
    #not that keep ground only option only rasters points classified as "2" in the lidar (ie ground)
    #this effectively creates a "bare earth dem"
    #note that this should only be used after remove_veg and/or remove_buildings has been run

    path_2_blastdem=lastools_loc+"\\bin\\blast2dem"

    if keep_only_ground==False:
        command="%s -i %s -o %s -step %s" % (path_2_blastdem, las, output, step)
    else:
        command="%s -i %s -o %s -step %s -keep_class 2" % (path_2_blastdem, las, output,step)

    returncode,output2 = check_output(command, False)

    if returncode!= 0:
        print("Error. blast2dem failed on %s" % las.split('\\')[-1].split('.')[0])
    else:
        return None


def extract_pts(las_in, cp_in, survey_date, beach, keep_only_ground=True):
    """Extract elevations from a las surface based on x and y coordinates.

    Requires lastools in system path.

    Args:
        las_in:            input point cloud (las)
        cp_in:             point coordinates with columns: id, x, y, z (csv)
        survey_date:       survey date string, e.g. '19700101'
        beach:             beach name
        keep_only_ground:  only keep points classified as 'ground' (boolean)

    Returns:
        Dataframe containing input coordinates with extracted elevations
    """

    cmd = ['lascontrol', '-i', las_in, '-cp', cp_in, '-parse', 'sxyz']

    if keep_only_ground == True:
        cmd += ['-keep_class', '2']

    # Call lastools
    process = subprocess.Popen(
        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout, stderr = process.communicate()
    errcode = process.returncode

    # Handle errors, if detected
    if errcode != 0:
        print("Error. lascontrol failed on {}".format(
            os.path.basename(las_in)))
        print(stderr.decode())

    # Load result into pandas dataframe
    df = pd.read_csv(io.BytesIO(stdout))

    # Tidy up dataframe
    df = df.drop(columns=['diff'])
    df['lidar_z'] = pd.to_numeric(df['lidar_z'], errors='coerce')
    df['Beach'] = beach
    df = df[[
        'Beach', 'ProfileNum', 'Easting', 'Northing', 'Chainage', 'lidar_z'
    ]]

    # Rename columns
    new_names = {
        'ProfileNum': 'Profile',
        'lidar_z': 'Elevation_{}'.format(survey_date),
    }
    df = df.rename(columns=new_names)

    return df


def update_survey_output(df, output_dir):
    """Update survey profile output csv files with current survey.

    Args:
        df:         dataframe containing current survey elevations
        output_dir: directory where csv files are saved

    Returns:
        None
    """
    # Merge current survey with existing data
    profiles = df['Profile'].unique()
    for profile in profiles:
        csv_name = os.path.join(output_csv_dir, profile + '.csv')

        # Extract survey data for current profile
        current_profile = df[df['Profile'] == profile]
        try:
            # Load existing results
            master = pd.read_csv(csv_name)
        except FileNotFoundError:
            master = current_profile.copy()

        # Add (or update) current survey
        current_survey_col = df.columns[-1]
        master[current_survey_col] = current_profile[current_survey_col]

        # Export updated results
        master.to_csv(csv_name)


def plot_profiles(profile_info, profile, output_loc, LL_limit):
    #plot the profile.  expects output from CC_split_profile

    YminorLocator=MultipleLocator(0.5)
    XminorLocator=MultipleLocator(5)


    fig,ax=plt.subplots(figsize=(8, 3))

    num_plots=len(profile_info.keys())-1
    colormap = plt.cm.jet
    ax.set_prop_cycle(cycler('color', [colormap(i) for i in np.linspace(0, 0.9, num_plots)]))

    max_y=0
    for date in profile_info.keys():
        if date!='info':

            plt.plot(profile_info[date]['Chainage'], profile_info[date]['Elevation'], label=date)
            try:
                if max([i for i in profile_info[date]['Elevation'] if pd.isnull(i)==False])>max_y:
                    max_y=max([i for i in profile_info[date]['Elevation'] if pd.isnull(i)==False])
            except:
                print("empty elevation section for  %s" %  date)


    plt.plot([LL_limit,LL_limit], [-1,max_y], 'r--', alpha=0.5, label="Landward Limit")


    plt.xlabel('Chainage (m)',weight='bold')
    plt.ylabel('Elevation (m AHD)',weight='bold')
    plt.legend(loc='upper right', bbox_to_anchor=(1.3,1))
    plt.title(profile)
    plt.rcParams['font.size']=8

    ax.set_ylim([-1,math.ceil(max_y)])

    ax.xaxis.set_minor_locator(XminorLocator)
    ax.yaxis.set_minor_locator(YminorLocator)
    ax.xaxis.grid(True, which='minor', color='k', linestyle='-', alpha=0.3)
    ax.yaxis.grid(True,which='minor',color='k', linestyle='-', alpha=0.3)

    plt.grid(which='major', color='k', linestyle='-')
    today=datetime.datetime.now().date().strftime('%Y%m%d')
    plt.savefig(os.path.join(output_loc, '%s_%s.png' % (today, profile)),bbox_inches='tight',dpi=900)
    plt.clf()

    return None


def CC_split_profile(file2read):
    # this reads the profile files and splits it into dates

    file_master=pd.read_csv(file2read)

    beach_original=file_master['Beach'].tolist()
    profile_original=file_master['Profile'].tolist()
    date_original=file_master['Date'].tolist()
    chainage_original=file_master['Chainage'].tolist()
    elevation_original=file_master['Elevation'].tolist()
    easting_original=file_master['Easting'].tolist()
    northing_original=file_master['Northing'].tolist()

    data={}
    i=0

    #add info on the beach and profile number
    data['info']={'Profile':profile_original[0], 'Beach':beach_original[0]}
    date_now=date_original[0]

    while i<len(file_master):
        chainage_tmp=[]
        elevation_tmp=[]
        easting_tmp=[]
        northing_tmp=[]
        while i<len(file_master) and date_now==date_original[i]:
            chainage_tmp.append(chainage_original[i])
            elevation_tmp.append(elevation_original[i])
            easting_tmp.append(easting_original[i])
            northing_tmp.append(northing_original[i])
            i=i+1

        data[date_now]={'Beach': beach_original[i-1], 'Profile':profile_original[i-1],'Easting': easting_tmp, 'Northing':northing_tmp, 'Elevation':elevation_tmp, 'Chainage':chainage_tmp}

        if i<len(file_master):
            date_now=date_original[i]

    return data

def profile_plots_volume(csv_loc, LL_xlsx, output_xlsx, graph_location):
    #get a list of all csvs which will each be analysed
    file_list=[]
    for file in os.listdir(csv_loc):
        if file.endswith(".csv"):
            file_list.append(os.path.join(csv_loc, file))

    #now read the LL file
    LL_limit_file=pd.read_excel(LL_xlsx, 'profile_locations')
    LL_info={}
    for i in range(0, len(LL_limit_file)):
        #make a dictionary that alllows you to search the LL
        prof="%s_%s" % (LL_limit_file['Profile'][i].split(" ")[0], LL_limit_file['Profile'][i].split(" ")[-1])

        LL_info[prof]=LL_limit_file['Landward Limit'][i]

    all_dates=[]
    results_volume={}
    for file in file_list:
        #read the profile data - this should have all dates
        profile_data=CC_split_profile(file)
        profile=profile_data['info']['Profile']

        #plot all of the profiles
        print(profile)
        plot_profiles(profile_data, profile, graph_location,LL_info[profile])

        results_volume[profile]={}

        #nowgo through each date and do a neilson volume calculations
        for date in profile_data.keys():
            if date!='info':
                if date not in all_dates:
                    all_dates.append(date)

                chainage=profile_data[date]['Chainage']
                elevation=[0 if pd.isnull(profile_data[date]['Elevation'][i]) else profile_data[date]['Elevation'][i] for i in range(0, len(profile_data[date]['Elevation']))]
                LL_limit=LL_info[profile]
                #do a neilson calculation to get the ZSA volume
                if len(elevation)>2:
                    #if there aren't enough available points don't do it
                    volume=neilson_volumes.volume_available(chainage, elevation, LL_limit)
                    if volume<0:
                        volume=0
                        print('%s %s has a negative volume available' % (profile, date))
                else:
                    volume=0

                results_volume[profile][date]=volume

    #write an excel sheet which summarises the data
    workbook = xlsxwriter.Workbook(output_xlsx)
    worksheet=workbook.add_worksheet('Volumes')

    row=0
    col=0

    worksheet.write(row, col, 'Profile')
    for date in all_dates:
        col=col+1
        worksheet.write(row, col, date)

    col=0
    row=1

    for prof in results_volume.keys():

        worksheet.write(row, col, prof)

        for date in all_dates:
            col=col+1
            try:
                vol=results_volume[prof][date]
            except KeyError:
                print("error with profile %s on %s" % (prof, date))
                vol=None
            worksheet.write(row, col, vol)
        col=0
        row=row+1
    return results_volume

def remove_temp_files(directory):
    for f in os.listdir(directory):
        os.unlink(os.path.join(directory, f))

    return None

###############################################################################
########################### RUN CODE ##########################################
params_file=pd.read_excel(input_file, sheet_name="PARAMS")

for i in range(0, len(params_file)): #0, len(params_file)
    print("Starting to process %s" % params_file['Beach'][i])
    beach=params_file['Beach'][i]
    survey_date=params_file['SURVEY DATE'][i]
    input_las5=params_file['INPUT LAS4'][i]
    crop_swash_poly=params_file['CROP SWASH POLY'][i]
    heatmap_crop_poly=params_file['HEATMAP CROP POLY'][i]
    final_las = params_file['FINAL LAS'][i]
    heatmap_las = params_file['HEATMAP LAS'][i]
    zone_MGA=params_file['ZONE MGA'][i]
    output_poly_name=params_file['OUTPUT POLY NAME'][i]
    path_2_output_poly=params_file['PATH TO OUTPUT'][i]
    output_raster=params_file['OUTPUT RASTER'][i]
    input_csv=params_file['INPUT CSV'][i]
    tmp_csv = params_file['TMP CSV'][i]
    LL_file=params_file['LL FILE'][i]
    csv_loc=params_file['OUT CSV LOC'][i]
    graph_loc = params_file['GRAPH LOC'][i]
    volume_output=params_file['VOLUME OUTPUT'][i]
    tmp_dir=params_file['TEMP DIR'][i]
    int_dir=params_file['INTERIM DIR'][i]

    # crop and get the output las
    crop_las(input_las5, crop_swash_poly, final_las, path_2_lastools)

    #now crop out the heatmap las
    crop_las(final_las, heatmap_crop_poly, heatmap_las, path_2_lastools)

    #create a polygon to crop a raster
    las_boundary(heatmap_las, output_poly_name, path_2_output_poly, path_2_lastools, zone_MGA)
    #make a raster
    make_raster(heatmap_las, output_raster, path_2_lastools, keep_only_ground=True)

    #extract the points and get volumes
    df = extract_pts(final_las, input_csv, survey_date, beach, keep_only_ground=True)
    update_survey_output(df, csv_loc)

    #colourise the point cloud


    #delete the temp files from the tmp_dir and the interim_dir
    remove_temp_files(tmp_dir)
    #remove_temp_files(int_dir)

print("doing the volume analysis")
test=profile_plots_volume(csv_loc, LL_file, volume_output, graph_loc)