import os
import FreeCAD as App
import FreeCADGui
from PySide import QtGui
import Serialize_SearchBar
import Parameters_SearchBar as Parameters

genericToolIcon = QtGui.QIcon(QtGui.QIcon(Parameters.genericToolIcon_Pixmap))


def getParam(grpPath, type_, name):
    return {
        # TODO: use letter icon based on the type, as the preferences editor does
        "icon": genericToolIcon,
        "text": name,
        "toolTip": "",
        "action": {"handler": "param", "path": grpPath, "type": type_, "name": name},
        "subitems": [],
    }


def getParamGroup(grpPath):
    try:
        grp = App.ParamGet(grpPath)
    except:
        return []
    contents = grp.GetContents()
    if contents is not None:
        return [getParam(grpPath, type_, name) for (type_, name, value) in contents]
    else:
        return []


def getParamGroups(nameInConfig, nameInPath):
    userParameterPath = App.ConfigGet(nameInConfig)
    from lxml import etree

    xml = etree.parse(userParameterPath).getroot()
    xml.find('FCParamGroup[@Name="Root"]')
    root = xml.find('FCParamGroup[@Name="Root"]')

    def recur(atRoot, path, name, tree):
        params = [] if atRoot else getParamGroup(path)
        subgroups = [
            recur(
                False,
                path + (":" if atRoot else "/") + child.attrib["Name"],
                child.attrib["Name"],
                child,
            )
            for child in tree.getchildren()
            if child.tag == "FCParamGroup"
        ]
        return {
            "icon": QtGui.QIcon(":/icons/Group.svg"),
            "text": name,
            "toolTip": "",
            "action": {"handler": "paramGroup", "path": path, "name": name},
            "subitems": params + subgroups,
        }

    return recur(True, nameInPath, nameInPath, root)


def getAllParams():
    try:
        from lxml import etree

        return [getParamGroups("UserParameter", "User parameter")]
    except:
        print(
            "Could not load the list of all parameters. Please install the LXML python library with:\npython -m pip install --upgrade lxml"
        )
        return []


def paramGroupAction(nfo):
    FreeCADGui.runCommand("Std_DlgParameter", 0)
    print("Open Parameter Editor (parameter group)")
    # TODO: find a way to select the desired group in the parameter dialog once it opens


def paramAction(nfo):
    FreeCADGui.runCommand("Std_DlgParameter", 0)
    print("Open Parameter Editor (single parameter)")
    # TODO: find a way to select the desired parameter in the parameter dialog once it opens


getters = {
    "Boolean": "GetBool",
    "Float": "GetFloat",
    "Integer": "GetInt",
    "String": "GetString",
    "Unsigned Long": "GetUnsigned",
}


def paramGroupToolTip(nfo, setParent):
    path = nfo["action"]["path"]
    name = nfo["action"]["name"]
    return "<h1>" + name + "</h1><p><code>App.ParamGet(" + repr(path) + ")</code></p"


def paramToolTip(nfo, setParent):
    path = nfo["action"]["path"]
    type_ = nfo["action"]["type"]
    name = nfo["action"]["name"]
    try:
        value = getattr(App.ParamGet(path), getters[type_])(name)
    except:
        value = "An error occurred while attempting to access this value."
    return (
        "<p><code>App.ParamGet("
        + repr(path)
        + ")."
        + getters[type_]
        + "("
        + repr(name)
        + ")</code></p><p>Type: "
        + type_
        + "</p><p>Value: "
        + repr(value)
        + "</p>"
    )


def paramResultsProvider():
    return getAllParams()