import os, subprocess, pydriller,json, pandas as pd
import sys
from dotenv import dotenv_values

from Database import Database

class RefactorAnalysis:

    def __init__(self,input_path="",output_path=""):
        if input_path=="":
            self.input_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),"data","refactoring-toy-example")
        else:
            self.input_path=input_path
        if output_path=="":
            self.output_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),"output_ref","output.json")
        else:
            self.output_path=output_path

    
    def generate_refactor_details(self):
        # ref_miner_bin = os.path.join(os.path.dirname(os.path.abspath(__file__)),"executable","RefactoringMiner","bin")
        ref_miner_bin = os.path.abspath("executable/RefactoringMiner/bin")
        # command = ["cd",ref_miner_bin,"&&","sh","RefactoringMiner","-a",self.input_path,"-json",self.output_path]
        command = ["sh","RefactoringMiner","-a",self.input_path,"-json",self.output_path]
        try:
            os.chdir(ref_miner_bin)
            shell_result = subprocess.run(command,capture_output=True,text=True)
            shell_result.check_returncode()
            # if shell_result!=0:
            #     raise Exception("Couldn't analyze repository - "+self.input_path+" with RefactorMiner")
            # return 0
        except subprocess.CalledProcessError as error:
            print(error)
            sys.exit()

        except Exception as e:
            print(e)
            return 1

    def parse_json_output(self):
        #TODO
        #Filter for Method Refs
        with open(self.output_path) as f:
            json_output = json.load(f)
            

        dict_output = {}
        for obj in json_output["commits"]:
            if len(obj["refactorings"])==0:
                continue
            changes = []
            se_lines = []
            for ref in obj["refactorings"]:
                if not "Method" in ref["type"]:
                    continue
                for parent_refs in ref["leftSideLocations"]:

                    changes.append(parent_refs["filePath"])
                    se_lines.append((parent_refs["startLine"],parent_refs["endLine"]))
            # list_output.append(dict_output)
            dict_output[obj["sha1"]]={
                "paths":changes,
                "ref_start_end":se_lines,
                "ref_type":ref["type"]
            }

        return dict_output
 
    def create_project_dataframe(self):

        df = pd.DataFrame(columns=['commit','refactoring_type','filename','meth_rf_neg','method_refactored'])

        parse_output_dict = self.parse_json_output()
        commits_to_analyze = list(parse_output_dict.keys())
        for commit in pydriller.Repository(self.input_path, only_commits=commits_to_analyze).traverse_commits():
            ref_list = parse_output_dict.get(commit.hash)
            ref_path_name = list(map(lambda x: str(x).split("/")[len(str(x).split("/"))-1],ref_list["paths"]))
            for cf in commit.modified_files:
                try:
                    index_ref = ref_path_name.index(cf.filename)
                except ValueError as ve:
                    continue
                if len(cf.changed_methods)==0:
                    continue
                #Diff between methods_changed and methods_before - does methods_changed reduces loop else we have to loop for all methods  
                for cm in cf.changed_methods:
                    
                    if cm.start_line<=ref_list["ref_start_end"][index_ref][0] and cm.end_line>=ref_list["ref_start_end"][index_ref][1]:
                        method_source_code = self.__split_and_extract_methods(cf.source_code_before,cm.start_line,cm.end_line)
                        method_source_code_neg = self.__split_and_extract_methods(cf.source_code,cm.start_line,cm.end_line)
                        class_source_code = cf.source_code_before

                        # df_row = {"commit":commit.hash,"refactoring_type":ref_list["ref_type"],"filename":cf.filename, "meth_rf_neg":class_source_code,"method_refactored":method_source_code}
                        df_row = {"commit":commit.hash,"refactoring_type":ref_list["ref_type"],"filename":cf.filename, "meth_rf_neg":method_source_code_neg,"method_refactored":method_source_code}
                        df.loc[len(df)] = df_row
        return df


    def __split_and_extract_methods(self, source_code,start_line, end_line):
        source_code_lines = str(source_code).splitlines()
        return "\n".join(source_code_lines[start_line-1:end_line])

def main():
    if not os.path.exists("data/repos/"):
        try:
            print("Starting repo download")
            repo_script = subprocess.run(["python","repo_download.py"], capture_output=True, text=True)
            repo_script.check_returncode()
        except subprocess.CalledProcessError as err:
            print(err)
            sys.exit(1)
    print("Repo Download Completed")
    lst_repos = next(os.walk("data/repos/"))[1]
    print(len(lst_repos))

    cwd = os.path.dirname(os.path.abspath(__file__))
    final_df = pd.DataFrame(columns=['commit','refactoring_type','filename','meth_rf_neg','method_refactored'])
    database = Database(dotenv_values(".env")['COLLECTION_NAME'])
    # database.connect_db()
    count=1
    batch_size = 5
    for idx,repo in enumerate(lst_repos):
        os.chdir(cwd)
        try:
            ref_obj = RefactorAnalysis(os.path.abspath(os.path.join("data/repos",repo)),os.path.abspath(os.path.join("output_ref",repo+".json")))
            # ref_miner = ref_obj.generate_refactor_details()               #Modify
            df = ref_obj.create_project_dataframe()
        except Exception as e:
            print(e)
            continue
        
        final_df = pd.concat([final_df,df], ignore_index=True)
        if count==batch_size or idx==len(lst_repos)-1:
            print("Inserting into DB", idx)
            database.insert_docs(final_df.to_dict(orient="records"))              
            final_df = pd.DataFrame(columns=['commit','refactoring_type','filename','meth_rf_neg','method_refactored'])
            count=1
        else:
            count+=1

if __name__=="__main__":
    main()