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# opcua/client.py

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from __future__ import absolute_import

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import os

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from editors.ConfTreeNodeEditor import ConfTreeNodeEditor

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from PLCControler import LOCATION_CONFNODE, LOCATION_VAR_INPUT, LOCATION_VAR_OUTPUT

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from .opcua_client_maker import OPCUAClientPanel, OPCUAClientModel, UA_IEC_types, authParams

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import util.paths as paths

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# Paths to open62541 assume that 

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# - open62541 directory is aside beremiz directory

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# - open62541 was just built (not installed)

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Open62541Path = paths.ThirdPartyPath("open62541")

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Open62541LibraryPath = os.path.join(Open62541Path,"build","bin") 

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Open62541IncludePaths = [os.path.join(Open62541Path, *dirs) for dirs in [

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    ("plugins","include"),

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    ("build","src_generated"),

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    ("include",),

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    ("arch",)]]

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class OPCUAClientEditor(ConfTreeNodeEditor):

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    CONFNODEEDITOR_TABS = [

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        (_("OPC-UA Client"), "CreateOPCUAClient_UI")]

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    def Log(self, msg):

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        self.Controler.GetCTRoot().logger.write(msg)

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    def CreateOPCUAClient_UI(self, parent):

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        return OPCUAClientPanel(parent, self.Controler.GetModelData(), self.Log, self.Controler.GetConfig)

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class OPCUAClient(object):

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    XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>

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    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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      <xsd:element name="OPCUAClient">

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        <xsd:complexType>

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          <xsd:sequence>

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            <xsd:element name="AuthType" minOccurs="0">

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              <xsd:complexType>

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                <xsd:choice minOccurs="0">

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                  <xsd:element name="x509">

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                    <xsd:complexType>

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                      <xsd:sequence>

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                        <xsd:element name="Policy">

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                          <xsd:annotation>

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                            <xsd:documentation>Default to Basic256Sha256 if not specified</xsd:documentation>

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                          </xsd:annotation>

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                          <xsd:complexType>

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                            <xsd:choice minOccurs="0">

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                              <xsd:element name="Basic256Sha256"/>

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                              <xsd:element name="Basic128Rsa15"/>

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                              <xsd:element name="Basic256"/>

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                            </xsd:choice>

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                          </xsd:complexType>

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                        </xsd:element>

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                        <xsd:element name="Mode">

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                          <xsd:complexType>

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                            <xsd:choice minOccurs="0">

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                              <xsd:element name="SignAndEncrypt"/>

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                              <xsd:element name="Sign"/>

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                            </xsd:choice>

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                          </xsd:complexType>

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                        </xsd:element>

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                      </xsd:sequence>

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                      <xsd:attribute name="Certificate" type="xsd:string" use="optional" default="certificate.pem"/>

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                      <xsd:attribute name="PrivateKey" type="xsd:string" use="optional" default="private_key.pem"/>

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                    </xsd:complexType>

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                  </xsd:element>

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                  <xsd:element name="UserPassword">

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                    <xsd:complexType>

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                      <xsd:attribute name="User" type="xsd:string" use="optional"/>

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                      <xsd:attribute name="Password" type="xsd:string" use="optional"/>

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                    </xsd:complexType>

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                  </xsd:element>

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                </xsd:choice>

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              </xsd:complexType>

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            </xsd:element>

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          </xsd:sequence>

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          <xsd:attribute name="Server_URI" type="xsd:string" use="optional" default="opc.tcp://localhost:4840"/>

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        </xsd:complexType>

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      </xsd:element>

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    </xsd:schema>

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    """

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    EditorType = OPCUAClientEditor

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    def __init__(self):

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        self.modeldata = OPCUAClientModel(self.Log, self.CTNMarkModified)

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        filepath = self.GetFileName()

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        if os.path.isfile(filepath):

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            self.modeldata.LoadCSV(filepath)

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    def Log(self, msg):

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        self.GetCTRoot().logger.write(msg)

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    def GetModelData(self):

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        return self.modeldata

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    def GetConfig(self):

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        def cfg(path): 

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            try:

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                attr=self.GetParamsAttributes("OPCUAClient."+path)

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            except ValueError:

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                return None

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            return attr["value"]

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        AuthType = cfg("AuthType")

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        res = dict(URI=cfg("Server_URI"), AuthType=AuthType)

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        paramList = authParams.get(AuthType, None)

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        if paramList:

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            for name,default in paramList:

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                value = cfg("AuthType."+name)

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                if value == "" or value is None:

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                    value = default

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                # cryptomaterial is expected to be in project's user provide file directory

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                if name in ["Certificate","PrivateKey"]:

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                    value = os.path.join(self.GetCTRoot()._getProjectFilesPath(), value)

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                res[name] = value

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        return res

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    def GetFileName(self):

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        return os.path.join(self.CTNPath(), 'selected.csv')

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    def OnCTNSave(self, from_project_path=None):

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        self.modeldata.SaveCSV(self.GetFileName())

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        return True

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    def CTNGenerate_C(self, buildpath, locations):

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        current_location = self.GetCurrentLocation()

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        locstr = "_".join(map(str, current_location))

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        c_path = os.path.join(buildpath, "opcua_client__%s.c" % locstr)

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        c_code = '#include "beremiz.h"\n'

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        c_code += self.modeldata.GenerateC(c_path, locstr, self.GetConfig())

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        with open(c_path, 'wb') as c_file:

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            c_file.write(c_code)

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        LDFLAGS = ['"' + os.path.join(Open62541LibraryPath, "libopen62541.a") + '"', '-lcrypto']

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        CFLAGS = ' '.join(['-I"' + path + '"' for path in Open62541IncludePaths])

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        # Note: all user provided files are systematicaly copied, including cryptomaterial

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        return [(c_path, CFLAGS)], LDFLAGS, True

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    def GetVariableLocationTree(self):

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        current_location = self.GetCurrentLocation()

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        locstr = "_".join(map(str, current_location))

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        name = self.BaseParams.getName()

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        entries = []

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        for direction, data in self.modeldata.iteritems():

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            iec_direction_prefix = {"input": "__I", "output": "__Q"}[direction]

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            for row in data:

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                dname, ua_nsidx, ua_nodeid_type, _ua_node_id, ua_type, iec_number = row

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                iec_type, C_type, iec_size_prefix, ua_type_enum, ua_type = UA_IEC_types[ua_type]

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                c_loc_name = iec_direction_prefix + iec_size_prefix + locstr + "_" + str(iec_number)

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                entries.append({

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                    "name": dname,

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                    "type": {"input": LOCATION_VAR_INPUT, "output": LOCATION_VAR_OUTPUT}[direction],

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                    "size": {"X":1, "B":8, "W":16, "D":32, "L":64}[iec_size_prefix],

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                    "IEC_type": iec_type,

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                    "var_name": c_loc_name,

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                    "location": iec_size_prefix + ".".join([str(i) for i in current_location]) + "." + str(iec_number),

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                    "description": "",

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                    "children": []})

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        return {"name": name,

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                "type": LOCATION_CONFNODE,

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                "location": ".".join([str(i) for i in current_location]) + ".x",

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                "children": entries}

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