#
# las2las_filter.py
#
# (c) 2025 rapidlasso GmbH - http://rapidlasso.com
#     fast tools to catch reality
#
# uses las2las.exe, the swiss-army knife of LiDAR processing, to filter
# the points with various criteria (this does *not* change the points)
#
# LiDAR input:   LAS/LAZ/BIN/TXT/SHP/BIL/ASC/DTM
# LiDAR output:  LAS/LAZ/BIN/TXT
#
# for licensing see http://lastools.org/LICENSE.txt
#

import sys, os, arcgisscripting, subprocess


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


### create the geoprocessor object
gp = arcgisscripting.create(9.3)

### get number of arguments
argc = len(sys.argv)

is64 = sys.argv[argc - 2] != "true"
exename = "las2las"

### optional use old 32 bit version
if is64:
    exename += "64"

### report that something is happening
gp.AddMessage("Starting " + exename + " ...")

### report arguments (for debug)
# gp.AddMessage("Arguments:")
# for i in range(0, argc):
#    gp.AddMessage("[" + str(i) + "]" + sys.argv[i])

### go back to lastools from \LAStools\ArcGIS_toolbox\scripts
lastools_bin = os.path.dirname(os.path.dirname(os.path.dirname(sys.argv[0])))

### make sure the path does not contain spaces
if lastools_bin.count(" ") > 0:
    gp.AddMessage("Error. Path to .\\lastools installation contains spaces.")
    gp.AddMessage("This does not work: " + lastools_bin)
    gp.AddMessage("This would work:    C:\\software\\lastools")
    sys.exit(1)

### complete the path to where the LAStools executables are
lastools_bin = lastools_bin + "\\bin"

### check if path exists
if os.path.exists(lastools_bin) == False:
    gp.AddMessage("Cannot find .\\lastools\\bin at " + lastools_bin)
    sys.exit(1)
else:
    gp.AddMessage("Found " + lastools_bin + " ...")

### create the full path to the executable
exe_path = lastools_bin + "\\" + exename

### check if executable exists
if os.path.exists(exe_path + ".exe") == False:
    gp.AddMessage("Cannot find " + exename + ".exe at " + exe_path)
    sys.exit(1)
else:
    gp.AddMessage("Found " + exe_path + " ...")

### create command string
command = ['"' + exe_path + '"']

### maybe use '-verbose' option
if sys.argv[argc - 1] == "true":
    command.append("-v")

### add input LiDAR
command.append("-i")
command.append('"' + sys.argv[1] + '"')

### maybe filter by coordinate
if sys.argv[2] != "#" and sys.argv[3] != "#":
    command.append("-" + sys.argv[2])
    command.append(sys.argv[3].replace(",", "."))

### maybe filter by other coordinate
if sys.argv[4] != "#" and sys.argv[5] != "#":
    command.append("-" + sys.argv[4])
    command.append(sys.argv[5].replace(",", "."))

### maybe filter by classification or return
if sys.argv[6] != "#":
    command.append("-" + sys.argv[6])
    if sys.argv[7] != "#":
        if (
            sys.argv[6] == "keep_classification"
            or sys.argv[6] == "drop_classification"
            or sys.argv[6] == "keep_return"
            or sys.argv[6] == "drop_return"
        ):
            command.append(sys.argv[7])

### maybe filter by various criteria
if sys.argv[8] != "#" and sys.argv[9] != "#":
    command.append("-" + sys.argv[8])
    command.append(sys.argv[9].replace(",", "."))

### this is where the output arguments start
out = 10

### maybe an output format was selected
if sys.argv[out] != "#":
    if sys.argv[out] == "las":
        command.append("-olas")
    elif sys.argv[out] == "laz":
        command.append("-olaz")
    elif sys.argv[out] == "bin":
        command.append("-obin")
    elif sys.argv[out] == "xyz":
        command.append("-otxt")
    elif sys.argv[out] == "xyzi":
        command.append("-otxt")
        command.append("-oparse")
        command.append("xyzi")
    elif sys.argv[out] == "txyzi":
        command.append("-otxt")
        command.append("-oparse")
        command.append("txyzi")

### maybe an output file name was selected
if sys.argv[out + 1] != "#":
    command.append("-o")
    command.append('"' + sys.argv[out + 1] + '"')

### maybe an output directory was selected
if sys.argv[out + 2] != "#":
    command.append("-odir")
    command.append('"' + sys.argv[out + 2] + '"')

### maybe an output appendix was selected
if sys.argv[out + 3] != "#":
    command.append("-odix")
    command.append('"' + sys.argv[out + 3] + '"')

### maybe there are additional command-line options
if sys.argv[out + 4] != "#":
    additional_options = sys.argv[out + 4].split()
    for option in additional_options:
        command.append(option)

### report command string
gp.AddMessage("LAStools command line:")
command_length = len(command)
command_string = str(command[0])
command[0] = command[0].strip('"')
for i in range(1, command_length):
    command_string = command_string + " " + str(command[i])
    command[i] = command[i].strip('"')
gp.AddMessage(command_string)

### run command
returncode, output = check_output(command, False)

### report output
if is64:
    if returncode == 0:
        gp.AddMessage(str(output))
    elif returncode == 1:
        gp.AddWarning(str(output))
    else:
        gp.AddError(str(output))
else:
    ### win 32: returncode not relieable - parse output
    if str(output).count("WARNING:") > 0:
        gp.AddWarning(str(output))
        returncode = 1
    elif str(output).count("ERROR:") > 0:
        gp.AddError(str(output))
        returncode = 3
    else:
        gp.AddMessage(str(output))

### return code
if returncode == 0:
    gp.AddMessage("Success. " + exename + " done.")
elif returncode == 1:
    gp.AddWarning("Warnings. " + exename + " done.")
else:
    gp.AddError("Error. " + exename + " failed.")
sys.exit(returncode)
