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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz

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# Copyright (C) 2019: Edouard TISSERANT

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#

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# See COPYING file for copyrights details.

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from __future__ import absolute_import

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import os

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import shutil

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from itertools import izip

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from pprint import pprint, pformat

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import wx

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import util.paths as paths

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from POULibrary import POULibrary

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from docutil import open_svg, get_inkscape_path

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from lxml import etree

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from util.ProcessLogger import ProcessLogger

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HMI_TYPES_DESC = {

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    "HMI_CLASS":{},

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    "HMI_LABEL":{},

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    "HMI_STRING":{},

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    "HMI_INT":{},

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    "HMI_REAL":{}

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}

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HMI_TYPES = HMI_TYPES_DESC.keys()

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from XSLTransform import XSLTransform

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ScriptDirectory = paths.AbsDir(__file__)

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class HMITreeNode(object):

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    def __init__(self, path, name, nodetype):

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        self.path = path

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        self.name = name

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        self.nodetype = nodetype

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        if nodetype in ["HMI_LABEL", "HMI_ROOT"]:

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            self.children = []

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    def pprint(self, indent = 0):

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        res = ">"*indent + pformat(self.__dict__, indent = indent, depth = 1) + "\n"

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        if hasattr(self, "children"): 

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            res += "\n".join([child.pprint(indent = indent + 1)

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                              for child in self.children])

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            res += "\n"

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        return res

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    def place_node(self, node):

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        best_child = None

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        known_best_match = 0

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        for child in self.children:

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            in_common = 0

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            for child_path_item, node_path_item in izip(child.path, node.path):

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                if child_path_item == node_path_item:

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                    in_common +=1

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                else:

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                    break

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            if in_common > known_best_match:

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                known_best_match = in_common

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                best_child = child

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        if best_child is not None and best_child.nodetype == "HMI_LABEL":

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            best_child.place_node(node)

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        else:

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            self.children.append(node)

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class SVGHMILibrary(POULibrary):

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    def GetLibraryPath(self):

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         return paths.AbsNeighbourFile(__file__, "pous.xml")

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    def Generate_C(self, buildpath, varlist, IECCFLAGS):

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        """

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        PLC Instance Tree:

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          prog0

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           +->v1 HMI_INT

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           +->v2 HMI_INT

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           +->fb0 (type mhoo)

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           |   +->va HMI_LABEL

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           |   +->v3 HMI_INT

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           |   +->v4 HMI_INT

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           |

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           +->fb1 (type mhoo)

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           |   +->va HMI_LABEL

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           |   +->v3 HMI_INT

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           |   +->v4 HMI_INT

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           |

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           +->fb2

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               +->v5 HMI_IN

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        HMI tree:

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          hmi0

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           +->v1

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           +->v2

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           +->fb0_va

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           |   +-> v3

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           |   +-> v4

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           |

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           +->fb1_va

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           |   +-> v3

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           |   +-> v4

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           |

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           +->v5

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        """

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        # Filter known HMI types

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        hmi_types_instances = [v for v in varlist if v["derived"] in HMI_TYPES]

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        # TODO add always available variables here ?

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        #    - plc status

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        #    - current page

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        #    - ...

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        # deduce HMI tree from PLC HMI_* instances

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        for v in hmi_types_instances:

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            path = v["IEC_path"].split(".")

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            new_node = HMITreeNode(path, path[-1], v["derived"])

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            hmi_tree_root.place_node(new_node)

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        print(hmi_tree_root.pprint())

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        # TODO generate C code to observe/access HMI tree variables

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        svghmi_c_filepath = paths.AbsNeighbourFile(__file__, "svghmi.c")

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        svghmi_c_file = open(svghmi_c_filepath, 'r')

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        svghmi_c_code = svghmi_c_file.read()

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        svghmi_c_file.close()

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        svghmi_c_code = svghmi_c_code % { "hmi_tree": "TODO !!!"}

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        gen_svghmi_c_path = os.path.join(buildpath, "svghmi.c")

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        gen_svghmi_c = open(gen_svghmi_c_path, 'w')

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        gen_svghmi_c.write(svghmi_c_code)

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        gen_svghmi_c.close()

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        return (["svghmi"], [(gen_svghmi_c_path, IECCFLAGS)], True), ""

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class SVGHMI(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="SVGHMI">

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        <xsd:complexType>

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          <xsd:attribute name="enableHTTP" type="xsd:boolean" use="optional" default="false"/>

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          <xsd:attribute name="bindAddress" type="xsd:string" use="optional" default="localhost"/>

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          <xsd:attribute name="port" type="xsd:string" use="optional" default="8080"/>

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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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    ConfNodeMethods = [

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        {

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            "bitmap":    "ImportSVG",

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            "name":    _("Import SVG"),

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            "tooltip": _("Import SVG"),

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            "method":   "_ImportSVG"

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        },

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        {

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            "bitmap":    "ImportSVG",  # should be something different

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            "name":    _("Inkscape"),

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            "tooltip": _("Edit HMI"),

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            "method":   "_StartInkscape"

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        },

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    ]

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    def _getSVGpath(self, project_path=None):

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        if project_path is None:

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            project_path = self.CTNPath()

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        # define name for SVG file containing gui layout

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        return os.path.join(project_path, "gui.svg")

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    def OnCTNSave(self, from_project_path=None):

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        if from_project_path is not None:

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            shutil.copyfile(self._getSVGpath(from_project_path),

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                            self._getSVGpath())

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        return True

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    def GetSVGGeometry(self):

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        # invoke inskscape -S, csv-parse output, produce elements

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        InkscapeGeomColumns = ["Id", "x", "y", "w", "h"]

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        # TODO : move following line to __init__

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        inkpath = get_inkscape_path()

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        svgpath = self._getSVGpath()

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        _status, result, _err_result = ProcessLogger(None,

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                                                     inkpath + " -S " + svgpath,

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                                                     no_stdout=True,

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                                                     no_stderr=True).spin()

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        res = []

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        for line in result.split():

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            strippedline = line.strip()

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            attrs = dict(

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                zip(InkscapeGeomColumns, line.strip().split(',')))

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            res.append(etree.Element("bbox", **attrs))

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        return res

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    def CTNGenerate_C(self, buildpath, locations):

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        """

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        Return C code generated by iec2c compiler

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        when _generate_softPLC have been called

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        @param locations: ignored

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        @return: [(C_file_name, CFLAGS),...] , LDFLAGS_TO_APPEND

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        """

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        # TODO fetch HMI tree from library

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        svgfile = self._getSVGpath()

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        if os.path.exists(svgfile):

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            # TODO : move to __init__

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            transform = XSLTransform(os.path.join(ScriptDirectory, "gen_index_xhtml.xslt"),

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                          [("GetSVGGeometry", lambda *_ignored:self.GetSVGGeometry())])

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            # load svg as a DOM with Etree

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            svgdom = etree.parse(svgfile)

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            # call xslt transform on Inkscape's SVG to generate XHTML

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            result = transform.transform(svgdom)

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            print(str(result))

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            print(transform.xslt.error_log)

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            # TODO

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            #   - Errors on HMI semantics

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            #   - ... maybe something to have a global view of what is declared in SVG.

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        else:

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            # TODO : use default svg that expose the HMI tree as-is 

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            pass

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        res = ([], "", False)

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        targetpath = os.path.join(self._getBuildPath(), "target.xhtml")

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        targetfile = open(targetpath, 'w')

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        # TODO : DOM to string

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        targetfile.write("TODO")

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        targetfile.close()

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        res += (("target.js", open(targetpath, "rb")),)

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        # TODO add C code to expose HMI tree variables to shared memory

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        # TODO generate a description of shared memory (xml or CSV) 

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        #      that can be loaded by svghmi QTWeb* app or svghmi server

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        return res

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    def _ImportSVG(self):

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        dialog = wx.FileDialog(self.GetCTRoot().AppFrame, _("Choose a SVG file"), os.getcwd(), "",  _("SVG files (*.svg)|*.svg|All files|*.*"), wx.OPEN)

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        if dialog.ShowModal() == wx.ID_OK:

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            svgpath = dialog.GetPath()

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            if os.path.isfile(svgpath):

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                shutil.copy(svgpath, self._getSVGpath())

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            else:

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                self.GetCTRoot().logger.write_error(_("No such SVG file: %s\n") % svgpath)

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        dialog.Destroy()

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    def _StartInkscape(self):

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        svgfile = self._getSVGpath()

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        open_inkscape = True

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        if not self.GetCTRoot().CheckProjectPathPerm():

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            dialog = wx.MessageDialog(self.GetCTRoot().AppFrame,

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                                      _("You don't have write permissions.\nOpen Inkscape anyway ?"),

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                                      _("Open Inkscape"),

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                                      wx.YES_NO | wx.ICON_QUESTION)

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            open_inkscape = dialog.ShowModal() == wx.ID_YES

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            dialog.Destroy()

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        if open_inkscape:

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            if not os.path.isfile(svgfile):

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                svgfile = None

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            open_svg(svgfile)