import os
from .. import __Orchestrator__

class Git():

    mAgentHostNameStr = None
    mAgentUserNameStr = None
    mAbsPathStr = None

    def __init__(self, inAgentHostNameStr=None, inAgentUserNameStr=None, inGitPathStr=""):
        """
        Init the Git repo instance. It helps to detect new changes in repo and auto restart services

        :param inAgentHostNameStr: Agent hostname in any case. Required to identify Process. If None - works with Orc session
        :param inAgentUserNameStr: Agent user name in any case. Required to identify Process. If None - works with Orc session
        :param inGitPathStr: Relative (from the orchestrator working directory) or absolute. If "" - work with Orc repo
        :return:
        """
        lAbsPathUpperStr = os.path.abspath(inGitPathStr).upper()
        lGS = __Orchestrator__.GSettingsGet()
        # Check if Process is not exists in GSettings
        if (inAgentHostNameStr.upper(), inAgentUserNameStr.upper(), lAbsPathUpperStr) not in lGS["ManagersGitDict"]:
            self.mAbsPathUpperStr = lAbsPathUpperStr
            self.mAgentHostNameStr = inAgentHostNameStr
            self.mAgentUserNameStr = inAgentUserNameStr
            lGS["ManagersGitDict"][(inAgentHostNameStr.upper(), inAgentUserNameStr.upper(), lAbsPathUpperStr)]=self
        else: raise Exception(f"Managers.Git ({inAgentHostNameStr}, {inAgentUserNameStr}, {lAbsPathUpperStr}): Can't init the Git instance because it already inited in early")

    def __OSCMDShell__(self, inCMDStr):
        """
        Detect the way of use and send the cmd

        :return: None is not exists
        """
        if self.mAgentUserNameStr is not None and self.mAgentHostNameStr is not None: # Check if Agent specified
            lActivityItemGUIDStr = __Orchestrator__.AgentOSCMD(inHostNameStr=self.mAgentHostNameStr,inUserStr=self.mAgentUserNameStr,inCMDStr=inCMDStr,inRunAsyncBool=False,inSendOutputToOrchestratorLogsBool=False)
            lCMDResultStr = __Orchestrator__.AgentActivityItemReturnGet(inGUIDStr=lActivityItemGUIDStr)
        else:
            lCMDResultStr = __Orchestrator__.OSCMD(inCMDStr=inCMDStr, inRunAsyncBool=False)
        return lCMDResultStr

    def BranchRevGet(self, inBranchNameStr="HEAD"):
        """
        Get the specified branch revision. Default return the current branch revision

        .. code-block:: python
            lGit.BranchRevGet(inBranchNameStr="dev") # Get revision of the local dev branch
            lGit.BranchRevGet(inBranchNameStr="remotes/origin/dev") # Get revision of the remotes dev branch
            lGit.BranchRevGet(inBranchNameStr="HEAD") # Get revision of the current HEAD branch
            lGit.BranchRevGet() # Equal to the call inBranchNameStr="HEAD"

        :param inBranchNameStr: The branch name where to get revision guid
        :return: revision GUID
        """
        lCMDStr = f"cd \"{self.mAbsPathUpperStr}\" && git rev-parse {inBranchNameStr}"
        lCMDResultStr = self.__OSCMDShell__(inCMDStr=lCMDStr)
        return lCMDResultStr

    def Fetch(self):
        """
        Get updates from the git server.

        .. code-block:: python
            lGit.Fetch() # get updates from the server

        :return: None
        """
        lCMDStr = f"cd \"{self.mAbsPathUpperStr}\" && git fetch"
        lCMDResultStr = self.__OSCMDShell__(inCMDStr=lCMDStr)

def GitExists(inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str) -> bool:
    """
    Check if the Git instance is exists in GSettings by the (inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str)

    :param inAgentHostNameStr: Agent hostname in any case. Required to identify Process
    :param inAgentUserNameStr: Agent user name in any case. Required to identify Process
    :param inGitPathStr: Relative (from the orchestrator working directory) or absolute. If "" - work with Orc repo
    :return: True - process exists in gsettings; False - else
    """
    return (inAgentHostNameStr.upper(), inAgentUserNameStr.upper(), inGitPathStr.upper()) in __Orchestrator__.GSettingsGet()["ManagersGitDict"]


def GitGet(inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str) -> Git:
    """
    Return the Git instance by the (inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str)

    :param inAgentHostNameStr: Agent hostname in any case. Required to identify Process
    :param inAgentUserNameStr: Agent user name in any case. Required to identify Process
    :param inGitPathStr: Relative (from the orchestrator working directory) or absolute. If "" - work with Orc repo
    :return: Git instance (if exists) Else None
    """
    lAbsPathUpperStr = os.path.abspath(inGitPathStr).upper()
    return __Orchestrator__.GSettingsGet()["ManagersGitDict"].get((inAgentHostNameStr.upper(), inAgentUserNameStr.upper(), lAbsPathUpperStr),None)


def GitBranchRevGet(inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str, inBranchNameStr: str="HEAD") -> str:
    lGit = GitGet(inAgentHostNameStr = inAgentHostNameStr, inAgentUserNameStr = inAgentUserNameStr, inGitPathStr=inGitPathStr)
    if lGit is not None: return lGit.BranchRevGet(inBranchNameStr=inBranchNameStr)

def GitFetch(inAgentHostNameStr: str, inAgentUserNameStr: str, inGitPathStr: str) -> None:
    lGit = GitGet(inAgentHostNameStr=inAgentHostNameStr, inAgentUserNameStr=inAgentUserNameStr,
                  inGitPathStr=inGitPathStr)
    if lGit is not None: lGit.Fetch()