import os
import subprocess as sub

# define semantics for release types by commit messages
## snapshot - snapshot release
## fix/patch - patch release
## bump - version bump release
## feature/feat/minor - minor release
## major/breaking - major release

GIT = 'git'
LOG = 'log'    
FORMAT = '"%h %s"'
FORMAT_DEC = "%d"
PRETTY_OPTION = '--pretty='
DECORATE_OPTION = '--decorate=full'
  
class GitRepo():

    def __init__(self):
        self.commits = None
        self.tags = None

    def __clean_commit_string(self, commit_string):
        return commit_string.replace('\"', "").replace('\n', "").split()

    def __clean_tag_string(self, tag_string):
        return tag_string.replace(" ", "").replace('\n', "")

    def get_tags(self):        
        stream = sub.Popen([GIT,
                            LOG,
                            PRETTY_OPTION + FORMAT_DEC,
                            DECORATE_OPTION],
                            stdout=sub.PIPE,
                            stderr=sub.PIPE,
                            text=True,
                            encoding="UTF-8")
        stdout = stream.stdout.readlines()
        stderr = stream.stderr.readlines()

        if len(stderr) > 0:
            raise Exception(f"Git command failed with: {stderr}")

        return stdout

    def get_commits(self):
        stream = sub.Popen([GIT, 
                            LOG, 
                            PRETTY_OPTION + FORMAT], 
                            stdout=sub.PIPE, 
                            stderr=sub.PIPE,
                            text=True,
                            encoding="UTF-8")
        stdout = stream.stdout.readlines()
        stderr = stream.stderr.readlines()

        if len(stderr) > 0:
            raise Exception(f"Git command failed with: {stderr}")
        
        self.tags = self.get_tags()
        self.commits = {}

        if len(self.tags) != len(stdout):
            raise Exception("Tags list did not match commits list")
        
        for i, elem in enumerate(stdout):
            commit_string = self.__clean_commit_string(elem)

            commit_id = commit_string[0]
            commit_message = " ".join(commit_string[1:len(commit_string)])
            commit_tag = self.__clean_tag_string(self.tags[i])
            
            self.commits[commit_id] = [commit_tag, commit_message]
        
        return self.commits