<?xml version='1.0' encoding='utf-8'?>
<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <variables>
    <variable name="FileNotify" type="HMI_INT"/>
    <variable name="CurrentPath" type="HMI_STRING" initial="..."/>
    <variable name="FileName" type="HMI_STRING"/>
  </variables>
  <globals>
    <xhtml:p><![CDATA[
from twisted.web.resource import Resource
from os import getcwd, listdir
from os.path import dirname, isfile, join
import collections, json


class FilesJsonResource(Resource):
    image_cache = {}

    def render_GET(self, request):
        request.setHeader('content-type', 'image/png')
        img_name = request.args[b'name'][0].decode('utf-8')
        p = getcwd()  + '/' + img_name
        if p not in self.image_cache:
            with open(p, 'rb') as image_file:
                img_bytes = image_file.read()
                self.image_cache[p] = img_bytes
        else:
            img_bytes = self.image_cache[p]
        return img_bytes


    def render_POST(self, request):
        newstr = request.content.getvalue()
        newdata = json.loads(newstr)
        args = newdata['args']
        range_feedback = newdata['range']
        slider_position = newdata['position']
        visible = newdata['visible']
        extra = newdata['extra']
        options = newdata['options']

        path = PLCGlobals.CurrentPath
        if path == '...':
            PLCGlobals.CurrentPath = path = getcwd()

        if len(options) == 1 :
            action, = options
            if action == 'action_reset':
                PLCGlobals.CurrentPath = path = getcwd()
        elif len(options) == 2 :
            action, sent_path = options
            if action == 'onClick[acknowledge]':
                if sent_path.endswith('.csv'):
                    PLCGlobals.FileName = sent_path
                    pyext_csv_reload()
                else:
                    PLCGlobals.CurrentPath = path = sent_path

        ld = listdir(path)
        ld.sort()

        if path != '/':
            FileList = [
                {
                    'name': '..',
                    'path': dirname(path),
                    'type': 'folder',
                    'status': 'active',
                    'thumbnail': '/files?name=folder.png'
                }
            ]
        else:
            FileList = []

        FileList.extend([
            {
                'name': f,
                'path': join(path, f),
                'type': 'folder',
                'status': 'active',
                'thumbnail': '/files?name=folder.png'
            }
            for f in ld
            if not (isfile(join(path, f)) 
            or f.startswith("."))
        ])
        FileList.extend([
            {
                'name': f,
                'path': join(path, f),
                'type': 'file',
                'status': 'active',
                'thumbnail': '/files?name=file.png'
            }
            for f in ld 
            if isfile(join(path, f)) 
            and f.endswith(".csv")
        ])

        answer = self.renderTable(
            FileList, range_feedback, slider_position, visible, extra
        )
        janswer = json.dumps(answer)
        return janswer.encode()

    def renderTable(self, FileList, old_range, old_position, visible, extra):
        if len(extra) > 0 and extra[0] != "":
            fFiles = [fl for fl in FileList if extra[0] in fl]
        else:
            fFiles = FileList[:]
        new_range = len(fFiles)
        delta = new_range - visible
        new_position = 0 if delta <= 0 else delta if old_position > delta else old_position
        new_visible = new_range if delta <= 0 else visible

        visible_files = []
        for desc in fFiles[new_position:new_position + new_visible]:
            visible_files.append(desc)

        return new_range, new_position, visible_files


]]></xhtml:p>
  </globals>
  <init>
    <xhtml:p><![CDATA[
]]></xhtml:p>
  </init>
  <cleanup>
    <xhtml:p><![CDATA[
]]></xhtml:p>
  </cleanup>
  <start>
    <xhtml:p><![CDATA[

AddPathToSVGHMIServers(b"files", FilesJsonResource)


]]></xhtml:p>
  </start>
  <stop>
    <xhtml:p><![CDATA[
]]></xhtml:p>
  </stop>
</PyFile>