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# -*- coding: utf-8 -*-

import arcpy, sys, os
from arcpy import management as DM

class Toolbox(object):
    def __init__(self):
        """Define the toolbox (the name of the toolbox is the name of the
        .pyt file)."""
        self.label = "heth"
        self.alias = ""

        # List of tool classes associated with this toolbox
        self.tools = [heth]


class heth(object):
    def __init__(self):
        """Define the tool (tool name is the name of the class)."""
        self.label = "HETH"
        self.description = ""
        self.canRunInBackground = False

    def getParameterInfo(self):
        """Define parameter definitions"""
        intable = arcpy.Parameter(
            displayName = "Input Table",
            name = "intable",
            datatype = "Table",
            parameterType = "Required",
            direction = "Input")
        
        eastWest = arcpy.Parameter(
            displayName = "eastWest",
            name = "eastWest",
            datatype = "Feature Layer",
            parameterType = "Required",
            direction = "Output")   
            
        northSouth = arcpy.Parameter(
            displayName = "northSouth",
            name = "northSouth",
            datatype = "Feature Layer",
            parameterType = "Required",
            direction = "Output")     
        params = [intable,eastWest,northSouth]
        return params

    def isLicensed(self):
        """Set whether tool is licensed to execute."""
        return True

    def updateParameters(self, parameters):
        """Modify the values and properties of parameters before internal
        validation is performed.  This method is called whenever a parameter
        has been changed."""
        return

    def updateMessages(self, parameters):
        """Modify the messages created by internal validation for each tool
        parameter.  This method is called after internal validation."""
        return

    def execute(self, parameters, messages):
        infeatures = parameters[0].valueAsText 
        eastWest = parameters[1].valueAsText 
        northSouth = parameters[2].valueAsText 
        ws = os.path.dirname(sys.argv[0])
        arcpy.env.workspace = ws

        csv = r"memory\csv"
        DM.CopyRows(infeatures, csv)
        DM.AddField(csv, field_name="sd_w", field_type="float")
        DM.AddField(csv, field_name="sd_e", field_type="float")
        DM.AddField(csv, field_name="sd_n", field_type="float")        
        DM.AddField(csv, field_name="sd_s", field_type="float")        
        DM.CalculateField(csv, field="sd_w", expression="float(!mean_lon!) - float(!sd_lon!)")
        DM.CalculateField(csv, field="sd_e", expression="float(!mean_lon!) + float(!sd_lon!)")
        DM.CalculateField(csv, field="sd_n", expression="float(!sd_lat_!) + float(!mean_lat!)")
        DM.CalculateField(csv, field="sd_s", expression="float(!mean_lat!) - float(!sd_lat_!)")
        
        DM.XYToLine(csv, eastWest, startx_field="sd_w", starty_field="mean_lat", endx_field="sd_e", endy_field="mean_lat")
        DM.XYToLine(csv, northSouth, startx_field="mean_lon", starty_field="sd_n", endx_field="mean_lon", endy_field="sd_s")

        return