from PackageUtils import PackageUtils
from Logger import Logger
from ChrootUtils import ChrootUtils
from ToolChainUtils import ToolChainUtils
from CommandUtils import CommandUtils
import os.path
from constants import constants
import shutil

class PackageBuilder(object):
    
    def __init__(self,mapPackageToCycles,listAvailableCyclicPackages,listBuildOptionPackages,pkgBuildOptionFile,logName=None,logPath=None):
        if logName is None:
            logName = "PackageBuilder"
        if logPath is None:
            logPath = constants.logPath
        self.logName=logName
        self.logPath=logPath
        self.logger=Logger.getLogger(logName,logPath)
        self.mapPackageToCycles = mapPackageToCycles
        self.listAvailableCyclicPackages = listAvailableCyclicPackages
        self.listNodepsPackages = ["glibc","gmp","zlib","file","binutils","mpfr","mpc","gcc","ncurses","util-linux","groff","perl","texinfo","rpm","openssl","go"]
        self.listBuildOptionPackages=listBuildOptionPackages
        self.pkgBuildOptionFile=pkgBuildOptionFile
        
    def prepareBuildRoot(self,chrootName,isToolChainPackage=False):
        chrootID=None
        try:
            chrUtils = ChrootUtils(self.logName,self.logPath)
            returnVal,chrootID = chrUtils.createChroot(chrootName)
            self.logger.debug("Created new chroot: " + chrootID)
            if not returnVal:
                raise Exception("Unable to prepare build root")
            tUtils=ToolChainUtils(self.logName,self.logPath)
#            if isToolChainPackage:
#                tUtils.installCoreToolChainPackages(chrootID)
#            else:
            tUtils.installToolChain(chrootID)
        except Exception as e:
            if chrootID is not None:
                self.logger.debug("Deleting chroot: " + chrootID)
                chrUtils.destroyChroot(chrootID)
            raise e
        return chrootID
    
    def findPackageNameFromRPMFile(self,rpmfile):
        rpmfile=os.path.basename(rpmfile)
        releaseindex=rpmfile.rfind("-")
        if releaseindex == -1:
            self.logger.error("Invalid rpm file:"+rpmfile)
            return None
        versionindex=rpmfile[0:releaseindex].rfind("-")
        if versionindex == -1:
            self.logger.error("Invalid rpm file:"+rpmfile)
            return None
        packageName=rpmfile[0:versionindex]
        return packageName
    
    def findInstalledPackages(self,chrootID):
        pkgUtils = PackageUtils(self.logName,self.logPath)
        listInstalledRPMs=pkgUtils.findInstalledRPMPackages(chrootID)
        listInstalledPackages=[]
        for installedRPM in listInstalledRPMs:
            packageName=self.findPackageNameFromRPMFile(installedRPM)
            if packageName is not None:
                listInstalledPackages.append(packageName)
        return listInstalledPackages
    
    def buildPackageThreadAPI(self,package,outputMap, threadName,):
        try:
            self.buildPackage(package)
            outputMap[threadName]=True
        except Exception as e:
            self.logger.error(e)
            outputMap[threadName]=False

    def checkIfPackageIsAlreadyBuilt(self, package):
        basePkg=constants.specData.getSpecName(package)
        listRPMPackages=constants.specData.getRPMPackages(basePkg)
        packageIsAlreadyBuilt=True
        pkgUtils = PackageUtils(self.logName,self.logPath)
        for pkg in listRPMPackages:
            if pkgUtils.findRPMFileForGivenPackage(pkg) is None:
                packageIsAlreadyBuilt=False
                break
        return packageIsAlreadyBuilt

    def buildPackage(self,package):
        #do not build if RPM is already built
        if self.checkIfPackageIsAlreadyBuilt(package):
            self.logger.info("Skipping building the package:"+package)
            return

        #should initialize a logger based on package name
        chrUtils = ChrootUtils(self.logName,self.logPath)
        chrootName="build-"+package
        chrootID=None
        isToolChainPackage=False
        if package in constants.listToolChainPackages:
            isToolChainPackage=True
        try:
            chrootID = self.prepareBuildRoot(chrootName,isToolChainPackage)
            destLogPath=constants.logPath+"/build-"+package
            if not os.path.isdir(destLogPath):
                cmdUtils = CommandUtils()
                cmdUtils.runCommandInShell("mkdir -p "+destLogPath)
            
            listInstalledPackages=self.findInstalledPackages(chrootID)
            self.logger.info("List of installed packages")
            self.logger.info(listInstalledPackages)
            listDependentPackages=self.findBuildTimeRequiredPackages(package)
            
            pkgUtils = PackageUtils(self.logName,self.logPath)
            if len(listDependentPackages) != 0:
                self.logger.info("Installing the build time dependent packages......")
                for pkg in listDependentPackages:
                    self.installPackage(pkgUtils, pkg,chrootID,destLogPath,listInstalledPackages)
                pkgUtils.installRPMSInAOneShot(chrootID,destLogPath)
                self.logger.info("Finished installing the build time dependent packages......")
            pkgUtils.adjustGCCSpecs(package, chrootID, destLogPath)
            pkgUtils.buildRPMSForGivenPackage(package,chrootID,self.listBuildOptionPackages,self.pkgBuildOptionFile,destLogPath)
            self.logger.info("Successfully built the package:"+package)
        except Exception as e:
            self.logger.error("Failed while building package:" + package)
            self.logger.debug("Chroot with ID: " + chrootID + " not deleted for debugging.")
            logFileName = os.path.join(destLogPath, package + ".log")
            fileLog = os.popen('tail -n 20 ' + logFileName).read()
            self.logger.debug(fileLog)
            raise e
        if chrootID is not None:
            chrUtils.destroyChroot(chrootID)
        
        
    def findRunTimeRequiredRPMPackages(self,rpmPackage):
        listRequiredPackages=constants.specData.getRequiresForPackage(rpmPackage)
        return listRequiredPackages
    
    def findBuildTimeRequiredPackages(self,package):
        listRequiredPackages=constants.specData.getBuildRequiresForPackage(package)
        return listRequiredPackages
    
    def installPackage(self,pkgUtils,package,chrootID,destLogPath,listInstalledPackages):
        if package in listInstalledPackages:
            return
        self.installDependentRunTimePackages(pkgUtils,package,chrootID,destLogPath,listInstalledPackages)
        noDeps=False
        if self.mapPackageToCycles.has_key(package):
            noDeps = True
        if package in self.listNodepsPackages:
            noDeps=True
        if package in constants.noDepsPackageList:
            noDeps=True
        pkgUtils.installRPM(package,chrootID,noDeps,destLogPath)
        listInstalledPackages.append(package)

    def installDependentRunTimePackages(self,pkgUtils,package,chrootID,destLogPath,listInstalledPackages):
        listRunTimeDependentPackages=self.findRunTimeRequiredRPMPackages(package)
        if len(listRunTimeDependentPackages) != 0:
            for pkg in listRunTimeDependentPackages:
                if self.mapPackageToCycles.has_key(pkg) and pkg not in self.listAvailableCyclicPackages:
                    continue
                if pkg in listInstalledPackages:
                    continue
                self.installPackage(pkgUtils,pkg,chrootID,destLogPath,listInstalledPackages)