#The name of the main class must match the file name in lowercase
import os
import urllib
import shutil
import gi
from gi.repository import Gio
gi.require_version ('Snapd', '1')
from gi.repository import Snapd
gi.require_version('AppStreamGlib', '1.0')
from gi.repository import AppStreamGlib as appstream
import time
#Needed for async find method, perhaps only on xenial
wrap=Gio.SimpleAsyncResult()
class snapmanager:
	
	def __init__(self):
		self.dbg=False
		self.progress=0
		self.partial_progress=0
		self.plugin_actions={'install':'snap','remove':'snap','pkginfo':'snap','load':'snap'}
		self.cache_dir="/var/lib/lliurexstore/bundles/cache"
		self.icons_folder=self.cache_dir+"/icons"
		self.result={}
		self.result['data']={}
		self.result['status']={}
		self.disabled=False
		self.icon_cache_enabled=True
		self.cli_mode=False
		if not os.path.isdir(self.icons_folder):
			try:
				os.makedirs(self.icons_folder)
			except:
				self.icon_cache_enabled=False
				self._debug("Icon cache disabled")
	#def __init__

	def set_debug(self,dbg=True):
		self.dbg=dbg
		self._debug ("Debug enabled")
	#def set_debug

	def _debug(self,msg=''):
		if self.dbg:
			print ('DEBUG snap: '+msg)
	#def debug

	def register(self):
		return(self.plugin_actions)

	def enable(self,state=False):
		self.disabled=state

	def execute_action(self,action,applist=None,store=None,results=0):
		if store:
			self.store=store
		else:
			self.store=appstream.Store()
		self.progress=0
		self.result['status']={'status':-1,'msg':''}
		self.result['data']=''
		

		if self.disabled==True:
			self._set_status(9)
			self.result['data']=self.store
		else:
			self.snap_client=Snapd.Client()
			self.snap_client.connect_sync(None)
			dataList=[]
			if action=='load':
				self.result['data']=self._load_snap_store(self.store)
			else:
				for app_info in applist:
					self.partial_progress=0
					if action=='install':
						dataList.append(self._install_snap(app_info))
					if action=='remove':
						dataList.append(self._remove_snap(app_info))
					if action=='pkginfo':
						dataList.append(self._get_info(app_info))
					self.progress+=round(self.partial_progress/len(applist),1)
					if self.progress>98:
						self.progress=98
				self.result['data']=list(dataList)
		self.progress=100
		return(self.result)

	def _set_status(self,status,msg=''):
		self.result['status']={'status':status,'msg':msg}
	#def _set_status

	def _callback(self,client,change, _,user_data):
	    # Interate over tasks to determine the aggregate tasks for completion.
	    total = 0
	    done = 0
	    for task in change.get_tasks():
	        total += task.get_progress_total()
	        done += task.get_progress_done()
	    self.progress = round((done/total)*100)
	#def _callback

	def _load_snap_store(self,store):
		pkgs=[]
		if self.cli_mode:
			pkgs=self._search_snap("*")
		else:
			pkgs=self._search_snap_async("*")
		self._set_status(1)
		for pkg in pkgs:
			store.add_app(self._generate_appstream_app(pkg))
		return(store)

	def _generate_appstream_app(self,pkg):
		bundle=appstream.Bundle()
		app=appstream.App()
		#F*****g appstream have kinds undefined but kind_from_string works... wtf?
#		bundle.set_kind(appstream.BundleKind.SNAP)
		bundle.set_kind(bundle.kind_from_string('SNAP'))
		bundle.set_id(pkg.get_name()+'.snap')
		app.add_bundle(bundle)
		app.set_name("C",pkg.get_name())
		app.add_pkgname(pkg.get_name()+'.snap')
		app.add_category("Snap")
		release=appstream.Release()
		release.set_version(pkg.get_version())
		app.add_release(release)
		app.set_id("io.snapcraft.%s"%pkg.get_name()+'.snap')
#		app.set_id(pkg.get_name()+'.snap')
		app.set_id_kind=appstream.IdKind.DESKTOP
		description=("This is an Snap bundle of app %s. It hasn't been tested by our developers and comes from a 3rd party dev team. Please use it carefully."%pkg.get_name())
		app.set_description("C",description+'<br>'+pkg.get_description())
		app.set_comment("C",pkg.get_summary())
		app.add_keyword("C",pkg.get_name())
		for word in pkg.get_summary().split(' '):
			app.add_keyword("C",word)

		if pkg.get_icon():
			app.set_icon_path(pkg.get_icon())
		return(app)

	def _search_cb(self,obj,request,*args):
		global wrap
		wrap=request

	def _search_snap_async(self,tokens):
		self._debug("Async Searching %s"%tokens)
		pkgs=None
		global wrap
		self.snap_client.find_async(Snapd.FindFlags.MATCH_NAME,
							tokens,
							None,
							self._search_cb,(None,),None)
		while 'Snapd' not in str(type(wrap)):
			time.sleep(0.1)
		snaps=self.snap_client.find_finish(wrap)
		if type(snaps)!=type([]):
			pkgs=[snaps]
		else:
			pkgs=snaps
		stable_pkgs=[]
		for pkg in pkgs:
			if pkg.get_channel()=='stable':
				stable_pkgs.append(pkg)
		return(stable_pkgs)

	def _search_snap(self,tokens):
		self._debug("Searching %s"%tokens)
		pkg=None
		try:
			pkgs=self.snap_client.find_sync(Snapd.FindFlags.MATCH_NAME,tokens,None,None)
		except Exception as e:
			print(e)
			self._set_status(1)
		stable_pkgs=[]
		for pkg in pkgs:
			if pkg.get_channel()=='stable':
				stable_pkgs.append(pkg)
		self._debug("Done")
		return(stable_pkgs)
	#def _search_snap

	def _download_file(self,url,app_name):
		target_file=self.icons_folder+'/'+app_name+".png"
		if not os.path.isfile(target_file):
			self._debug("Downloading %s to %s"%(url,target_file))
			try:
				with urllib.request.urlopen(url) as response, open(target_file, 'wb') as out_file:
					bf=16*1024
					acumbf=0
					file_size=int(response.info()['Content-Length'])
					while True:
						if acumbf>=file_size:
						    break
						shutil.copyfileobj(response, out_file,bf)
						acumbf=acumbf+bf
				st = os.stat(target_file)
				os.chmod(target_file, st.st_mode | 0o111)
			except Exception as e:
				self._debug("Unable to download %s"%url)
				self._debug("Reason: %s"%e)
		return(target_file)
	#def _download_file


	def _get_info(self,app_info):
		#switch to launch async method when running under a gui
		#For an unknown reason request will block when sync mode under a gui and async blocks when on cli (really funny)
		if self.cli_mode:
			pkgs=self._search_snap(app_info['name'])
		else:
			pkgs=self._search_snap_async(app_info['name'])
		if type(pkgs)==type([]):
			for pkg in pkgs:
				if pkg.get_download_size():
					app_info['size']=str(pkg.get_download_size())
				else:
					app_info['size']=str(pkg.get_installed_size())
				if pkg.get_icon():
					if self.icon_cache_enabled:
						app_info['icon']=self._download_file(pkg.get_icon(),app_info['name'])
					else:
						app_info['icon']=pkg.get_icon()
				if pkg.get_status():
					#Not working on xenial
#					if pkg.get_status()==Snapd.SnapStatus.INSTALLED or pkg.get_status()==3:
#						app_info['state']='installed'
					try:
						self.snap_client.list_one_sync(pkg.get_name())
						app_info['state']='installed'
					except:
						app_info['state']='available'
				if pkg.get_screenshots():
					screenshot_list=[]
					for screen in pkg.get_screenshots():
						screenshot_list.append(screen.get_url())
					app_info["screenshots"]=screenshot_list
				#Method not working in xenial, license default type assigned in infoManager
#				if pkg.get_license():
#					app_info["license"]=pkg.get_license()
				break
		else:
			app_info['size']='0'
		self._debug("Info for %s"%app_info)
		self.partial_progress=100
		return(app_info)
	#def _get_info

	def _install_snap(self,app_info):
		self._debug("Installing %s"%app_info['name'])
		if app_info['state']=='installed':
			self._set_status(4)
		else:
			try:
				self.snap_client.install_sync(app_info['name'],
                        None, # channel
                        self._callback, (None,),
                        None) # cancellable
				app_info['state']='installed'
				self._set_status(0)
			except Exception as e:
				print("Install error %s"%e)
				self._set_status(5)

		self._debug("Installed %s"%app_info)
		return app_info
	#def _install_snap

	def _remove_snap(self,app_info):
		if app_info['state']=='available':
			self._set_status(3)
		else:
			try:
				self.snap_client.remove_sync(app_info['name'],
                       self._callback, (None,),
						None) # cancellable
				app_info['state']='available'
				self._set_status(0)
			except Exception as e:
				print("Remove error %s"%e)
				self._set_status(6)
		return app_info
	#def _remove_snap