import sys
import os
import shutil
from itertools import islice

def copy(src, dst, rename):
    try:
        shutil.copyfile(src, dst)
        if rename is False:
            print("[DEBUG]", "Copied file from %s to %s." % (src, dst))
        else:
            print("[DEBUG]", "Renamed file from %s to %s." % (src, dst))
    except shutil.SameFileError:
        print("Source and destination represents the same file.")
    except IsADirectoryError:
        print("Destination is a directory.")
    except PermissionError:
        print("Permission denied.")
    except Exception as e:
        print(e)
        print("Error occured while copying file.")

p = '.\configuration\slo\\'
for file in os.listdir(p):
    fn_content = file.split(".")
    vars = {}
    
    with open(os.path.join(p,file)) as f:
        i = 0
        firstLine = f.readline()
        meta = firstLine.split()
        
        for line in f:
            multiline = ""
            #check for key value pair
            if " = " in line:
                try:
                    if "<<-EOT" in line:
                       multiline = "<<-EOT\n"
                       skipped = islice(f,i,None)
                       for i, l in enumerate(skipped):
                           
                           if "EOT" not in l:
                              multiline = multiline + l
                           else:
                               multiline = multiline + l
                               break
                    
                       
                    name,var = line.partition(" = ")[::2]
                    var.strip()
                    if multiline != "":
                        var = multiline

                    #remove spaces and "#" as this is used for optional fields
                    vars['"{' + name.strip().lstrip("#").strip() + '}"'] = var
                    vars["{ResourceName}"] = meta[2].replace('"','')
                except Exception as e:
                    print(e)
            i = i + 1
        

        copy('./templates/service-level-objective.tf','./output/slo/service-level-objective.tf',False)   
        os.rename('.\output\slo\service-level-objective.tf','./output/slo/' + meta[2].replace('"','') + '.tf')
        with open('./output/slo/' + meta[2].replace('"','') + '.tf') as tf:
            data = tf.read()
            for key,var in vars.items():
                #print(key,var)
                data = data.replace(key, var)
            
        with open('./output/slo/' + meta[2].replace('"','') + '.tf','w+') as tf:
            tf.write(data)

        tf_command = "terraform.exe import module." + meta[2].replace('"','')  + ".dynatrace_slo.main " + fn_content[1]
        print(tf_command)