"""
@package core.settings

@brief Default GUI settings

List of classes:
 - settings::Settings

Usage:
@code
from core.settings import UserSettings
@endcode

(C) 2007-2017 by the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Martin Landa <landa.martin gmail.com>
@author Luca Delucchi <lucadeluge gmail.com> (language choice)
"""

import os
import sys
import copy
import wx
import json
import collections.abc

from core import globalvar
from core.gcmd import GException, GError
from core.utils import GetSettingsPath, PathJoin, rgb2str


class SettingsJSONEncoder(json.JSONEncoder):
    """Custom JSON encoder.

    Encodes color represented internally as tuple
    to hexadecimal color (tuple is represented as
    list in JSON, however GRASS expects tuple for colors).
    """

    def default(self, obj):
        """Encode not automatically serializable objects."""
        # we could use dictionary mapping as in wxplot
        if isinstance(obj, (wx.FontFamily, wx.FontStyle, wx.FontWeight)):
            return int(obj)
        return json.JSONEncoder.default(self, obj)

    def iterencode(self, obj):
        """Encode color tuple"""

        def color(item):
            if isinstance(item, tuple):
                if len(item) == 3:
                    return "#{0:02x}{1:02x}{2:02x}".format(*item)
                if len(item) == 4:
                    return "#{0:02x}{1:02x}{2:02x}{3:02x}".format(*item)
            if isinstance(item, list):
                return [color(e) for e in item]
            if isinstance(item, dict):
                return {key: color(value) for key, value in item.items()}
            else:
                return item

        return super().iterencode(color(obj))


def settings_JSON_decode_hook(obj):
    """Decode hex color saved in settings into tuple"""

    def colorhex2tuple(hexcode):
        hexcode = hexcode.lstrip("#")
        return tuple(int(hexcode[i : i + 2], 16) for i in range(0, len(hexcode), 2))

    for k, v in obj.items():
        if isinstance(v, str) and v.startswith("#") and len(v) in [7, 9]:
            obj[k] = colorhex2tuple(v)
    return obj


class Settings:
    """Generic class where to store settings"""

    def __init__(self):
        # settings file
        self.filePath = os.path.join(GetSettingsPath(), "wx.json")
        self.legacyFilePath = os.path.join(GetSettingsPath(), "wx")

        # key/value separator
        self.sep = ";"

        # define default settings
        self._defaultSettings()  # -> self.defaultSettings

        # read settings from the file
        self.userSettings = copy.deepcopy(self.defaultSettings)
        try:
            self.ReadSettingsFile()
        except GException as e:
            print(e.value, file=sys.stderr)

        # define internal settings
        self._internalSettings()  # -> self.internalSettings

    def _generateLocale(self):
        """Generate locales"""
        try:
            self.locs = os.listdir(os.path.join(os.environ["GISBASE"], "locale"))
            self.locs.append("en")  # GRASS doesn't ship EN po files
            self.locs.sort()
            # Add a default choice to not override system locale
            self.locs.insert(0, "system")
        except:
            # No NLS
            self.locs = ["system"]

        return "system"

    def _defaultSettings(self):
        """Define default settings"""
        try:
            projFile = PathJoin(os.environ["GRASS_PROJSHARE"], "epsg")
        except KeyError:
            projFile = ""

        id_loc = self._generateLocale()

        self.defaultSettings = {
            #
            # general
            #
            "general": {
                # use default window layout (layer manager, displays, ...)
                "defWindowPos": {
                    "enabled": True,
                    "dim": "1,1,%d,%d,%d,1,%d,%d"
                    % (
                        globalvar.GM_WINDOW_SIZE[0],
                        globalvar.GM_WINDOW_SIZE[1],
                        globalvar.GM_WINDOW_SIZE[0] + 1,
                        globalvar.MAP_WINDOW_SIZE[0],
                        globalvar.MAP_WINDOW_SIZE[1],
                    ),
                    "dimSingleWindow": "1,1,1,1",
                },
                # workspace
                "workspace": {
                    "posDisplay": {"enabled": False},
                    "posManager": {"enabled": False},
                },
                # region
                "region": {
                    "resAlign": {"enabled": False},
                },
                "singleWinPanesLayoutPos": {
                    "enabled": False,
                    "pos": "",
                },
            },
            #
            # datacatalog
            #
            "datacatalog": {
                # grassdb string
                "grassdbs": {"listAsString": ""},
                "lazyLoading": {"enabled": False, "asked": False},
            },
            "manager": {
                # show opacity level widget
                "changeOpacityLevel": {"enabled": False},
                # ask when removing layer from layer tree
                "askOnRemoveLayer": {"enabled": True},
                # ask when quitting wxGUI or closing display
                "askOnQuit": {"enabled": True},
                # hide tabs
                "hideTabs": {"search": False, "pyshell": False, "history": False},
                "copySelectedTextToClipboard": {"enabled": False},
            },
            #
            # appearance
            #
            "appearance": {
                "outputfont": {
                    "type": "Courier New",
                    "size": 10,
                },
                "manualPageFont": {
                    "faceName": "",
                    "pointSize": "",
                },
                # expand/collapse element list
                "elementListExpand": {"selection": 0},
                "menustyle": {"selection": 1},
                "gSelectPopupHeight": {"value": 200},
                "iconTheme": {"type": "grass"},
                "commandNotebook": {"selection": 0},
                "singleWindow": {"enabled": True},
            },
            #
            # language
            #
            "language": {"locale": {"lc_all": id_loc}},
            #
            # display
            #
            "display": {
                "font": {
                    "type": "",
                    "encoding": "UTF-8",
                },
                "driver": {"type": "cairo"},
                "alignExtent": {"enabled": True},
                "compResolution": {"enabled": False},
                "autoRendering": {"enabled": True},
                "autoZooming": {"enabled": False},
                "showCompExtent": {"enabled": True},
                "statusbarMode": {"selection": 0},
                "bgcolor": {
                    "color": (255, 255, 255, 255),
                },
                "mouseWheelZoom": {
                    "selection": 1,
                },
                "scrollDirection": {
                    "selection": 0,
                },
                "nvizDepthBuffer": {
                    "value": 16,
                },
            },
            #
            # projection
            #
            "projection": {
                "statusbar": {
                    "proj4": "",
                    "epsg": "",
                    "projFile": projFile,
                },
                "format": {
                    "ll": "DMS",
                    "precision": 2,
                },
            },
            #
            # Attribute Table Manager
            #
            "atm": {
                "highlight": {
                    "color": (255, 255, 0, 255),
                    "width": 2,
                    "auto": True,
                },
                "leftDbClick": {"selection": 1},  # draw selected
                "askOnDeleteRec": {"enabled": True},
                "keycolumn": {"value": "cat"},
                "encoding": {
                    "value": "",
                },
            },
            #
            # Command
            #
            "cmd": {
                "overwrite": {"enabled": False},
                "closeDlg": {"enabled": False},
                "verbosity": {"selection": "grassenv"},
                "addNewLayer": {
                    "enabled": True,
                },
                "interactiveInput": {
                    "enabled": True,
                },
            },
            #
            # d.rast
            #
            "rasterLayer": {
                "opaque": {"enabled": False},
                "colorTable": {"enabled": False, "selection": "rainbow"},
            },
            #
            # d.vect
            #
            "vectorLayer": {
                "featureColor": {
                    "color": (0, 29, 57),
                    "transparent": {"enabled": False},
                },
                "areaFillColor": {
                    "color": (0, 103, 204),
                    "transparent": {"enabled": False},
                },
                "line": {
                    "width": 0,
                },
                "point": {
                    "symbol": "basic/x",
                    "size": 5,
                },
                "showType": {
                    "point": {"enabled": True},
                    "line": {"enabled": True},
                    "centroid": {"enabled": False},
                    "boundary": {"enabled": False},
                    "area": {"enabled": True},
                    "face": {"enabled": True},
                },
                "randomColors": {
                    "enabled": False,
                },
            },
            #
            # vdigit
            #
            "vdigit": {
                # symbology
                "symbol": {
                    "newSegment": {"enabled": None, "color": (255, 0, 0, 255)},  # red
                    "newLine": {
                        "enabled": None,
                        "color": (0, 86, 45, 255),
                    },  # dark green
                    "highlight": {
                        "enabled": None,
                        "color": (255, 255, 0, 255),
                    },  # yellow
                    "highlightDupl": {
                        "enabled": None,
                        "color": (255, 72, 0, 255),
                    },  # red
                    "point": {"enabled": True, "color": (0, 0, 0, 255)},  # black
                    "line": {"enabled": True, "color": (0, 0, 0, 255)},  # black
                    "boundaryNo": {
                        "enabled": True,
                        "color": (126, 126, 126, 255),
                    },  # grey
                    "boundaryOne": {
                        "enabled": True,
                        "color": (0, 255, 0, 255),
                    },  # green
                    "boundaryTwo": {
                        "enabled": True,
                        "color": (255, 135, 0, 255),
                    },  # orange
                    "centroidIn": {"enabled": True, "color": (0, 0, 255, 255)},  # blue
                    "centroidOut": {
                        "enabled": True,
                        "color": (165, 42, 42, 255),
                    },  # brown
                    "centroidDup": {
                        "enabled": True,
                        "color": (156, 62, 206, 255),
                    },  # violet
                    "nodeOne": {"enabled": True, "color": (255, 0, 0, 255)},  # red
                    "nodeTwo": {
                        "enabled": True,
                        "color": (0, 86, 45, 255),
                    },  # dark green
                    "vertex": {
                        "enabled": False,
                        "color": (255, 20, 147, 255),
                    },  # deep pink
                    "area": {"enabled": True, "color": (217, 255, 217, 255)},  # green
                    "direction": {"enabled": False, "color": (255, 0, 0, 255)},  # red
                },
                # display
                "lineWidth": {"value": 2, "units": "screen pixels"},
                # snapping
                "snapping": {
                    "value": 10,
                    "unit": 0,  # new
                    "units": "screen pixels",  # old for backwards comp.
                },
                "snapToVertex": {"enabled": True},
                # digitize new record
                "addRecord": {"enabled": True},
                "layer": {"value": 1},
                "category": {"value": 1},
                "categoryMode": {"selection": 0},
                # delete existing feature(s)
                "delRecord": {"enabled": True},
                # query tool
                "query": {"selection": 0, "box": True},
                "queryLength": {"than-selection": 0, "thresh": 0},
                "queryDangle": {"than-selection": 0, "thresh": 0},
                # select feature (point, line, centroid, boundary)
                "selectType": {
                    "point": {"enabled": True},
                    "line": {"enabled": True},
                    "centroid": {"enabled": True},
                    "boundary": {"enabled": True},
                },
                "selectThresh": {
                    "value": 10,
                    "unit": 0,  # new
                    "units": "screen pixels",  # old for backwards comp.
                },
                "checkForDupl": {"enabled": False},
                "selectInside": {"enabled": False},
                # exit
                "saveOnExit": {
                    "enabled": False,
                },
                # break lines on intersection
                "breakLines": {
                    "enabled": True,
                },
                # close boundary (snap to the first node)
                "closeBoundary": {
                    "enabled": False,
                },
            },
            #
            # plots for profiles, histograms, and scatterplots
            #
            "profile": {
                "raster": {
                    "pcolor": (0, 0, 255, 255),  # line color
                    "pwidth": 1,  # line width
                    "pstyle": "solid",  # line pen style
                    "datatype": "cell",  # raster type
                },
                "font": {
                    "titleSize": 12,
                    "axisSize": 11,
                    "legendSize": 10,
                    "defaultSize": 11,
                    "family": wx.FONTFAMILY_SWISS,
                    "style": wx.FONTSTYLE_NORMAL,
                    "weight": wx.FONTWEIGHT_NORMAL,
                },
                "marker": {
                    "color": (0, 0, 0, 255),
                    "fill": "transparent",
                    "size": 2,
                    "type": "triangle",
                    "legend": _("Segment break"),
                },
                "grid": {
                    "color": (200, 200, 200, 255),
                    "enabled": True,
                },
                "x-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "y-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "legend": {"enabled": True},
            },
            "histogram": {
                "raster": {
                    "pcolor": (0, 0, 255, 255),  # line color
                    "pwidth": 1,  # line width
                    "pstyle": "solid",  # line pen style
                    "datatype": "cell",  # raster type
                },
                "font": {
                    "titleSize": 12,
                    "axisSize": 11,
                    "legendSize": 10,
                    "defaultSize": 11,
                    "family": wx.FONTFAMILY_SWISS,
                    "style": wx.FONTSTYLE_NORMAL,
                    "weight": wx.FONTWEIGHT_NORMAL,
                },
                "grid": {
                    "color": (200, 200, 200, 255),
                    "enabled": True,
                },
                "x-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "y-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "legend": {"enabled": True},
            },
            "scatter": {
                "raster": {
                    "pcolor": (0, 0, 255, 255),
                    "pfill": "solid",
                    "psize": 1,
                    "ptype": "dot",
                    # FIXME: this is only a quick fix
                    # using also names used in a base class for compatibility
                    # probably used only for initialization
                    # base should be rewritten to not require this
                    "pwidth": 1,  # required by wxplot/base, maybe useless here
                    "pstyle": "dot",  # line pen style
                    "plegend": _("Data point"),
                    0: {"datatype": "CELL"},
                    1: {"datatype": "CELL"},
                },
                "font": {
                    "titleSize": 12,
                    "axisSize": 11,
                    "legendSize": 10,
                    "defaultSize": 11,
                    "family": wx.FONTFAMILY_SWISS,
                    "style": wx.FONTSTYLE_NORMAL,
                    "weight": wx.FONTWEIGHT_NORMAL,
                },
                "grid": {
                    "color": (200, 200, 200, 255),
                    "enabled": True,
                },
                "x-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "y-axis": {
                    "type": "auto",  # axis format
                    "min": 0,  # axis min for custom axis range
                    "max": 0,  # axis max for custom axis range
                    "log": False,
                },
                "legend": {"enabled": True},
            },
            "gcpman": {
                "rms": {
                    "highestonly": True,
                    "sdfactor": 1,
                },
                "symbol": {
                    "color": (0, 0, 255, 255),
                    "hcolor": (255, 0, 0, 255),
                    "scolor": (0, 255, 0, 255),
                    "ucolor": (255, 165, 0, 255),
                    "unused": True,
                    "size": 8,
                    "width": 2,
                },
                "map": {
                    "overwrite": False,
                },
            },
            "nviz": {
                "view": {
                    "persp": {
                        "value": 20,
                        "step": 2,
                    },
                    "position": {
                        "x": 0.84,
                        "y": 0.16,
                    },
                    "twist": {
                        "value": 0,
                    },
                    "z-exag": {
                        "min": 0,
                        "max": 10,
                        "value": 1,
                    },
                    "background": {
                        "color": (255, 255, 255, 255),  # white
                    },
                },
                "fly": {
                    "exag": {
                        "move": 5,
                        "turn": 5,
                    }
                },
                "animation": {"fps": 24, "prefix": _("animation")},
                "surface": {
                    "shine": {
                        "map": False,
                        "value": 60.0,
                    },
                    "color": {
                        "map": True,
                        "value": (100, 100, 100, 255),  # constant: grey
                    },
                    "draw": {
                        "wire-color": (136, 136, 136, 255),
                        "mode": 1,  # fine
                        "style": 1,  # surface
                        "shading": 1,  # gouraud
                        "res-fine": 6,
                        "res-coarse": 9,
                    },
                    "position": {
                        "x": 0,
                        "y": 0,
                        "z": 0,
                    },
                },
                "constant": {
                    "color": (100, 100, 100, 255),
                    "value": 0.0,
                    "transp": 0,
                    "resolution": 6,
                },
                "vector": {
                    "lines": {
                        "show": False,
                        "width": 2,
                        "color": (0, 0, 0, 255),
                        "flat": False,
                        "height": 0,
                        "rgbcolumn": None,
                        "sizecolumn": None,
                    },
                    "points": {
                        "show": False,
                        "size": 100,
                        "autosize": True,
                        "width": 2,
                        "marker": 2,
                        "color": (0, 0, 0, 255),
                        "height": 0,
                        "rgbcolumn": None,
                        "sizecolumn": None,
                    },
                },
                "volume": {
                    "color": {
                        "map": True,
                        "value": (100, 100, 100, 255),  # constant: grey
                    },
                    "draw": {
                        "mode": 0,  # isosurfaces
                        "shading": 1,  # gouraud
                        "resolution": 3,  # polygon resolution
                        "box": False,  # draw wire box
                    },
                    "shine": {
                        "map": False,
                        "value": 60,
                    },
                    "topo": {"map": None, "value": 0.0},
                    "transp": {"map": None, "value": 0},
                    "mask": {"map": None, "value": ""},
                    "slice_position": {
                        "x1": 0,
                        "x2": 1,
                        "y1": 0,
                        "y2": 1,
                        "z1": 0,
                        "z2": 1,
                        "axis": 0,
                    },
                },
                "cplane": {
                    "shading": 4,
                    "rotation": {"rot": 180, "tilt": 0},
                    "position": {"x": 0, "y": 0, "z": 0},
                },
                "light": {
                    "position": {
                        "x": 0.68,
                        "y": -0.68,
                        "z": 80,
                    },
                    "bright": 80,
                    "color": (255, 255, 255, 255),  # white
                    "ambient": 20,
                },
                "fringe": {
                    "elev": 55,
                    "color": (128, 128, 128, 255),  # grey
                },
                "arrow": {
                    "color": (0, 0, 0),
                },
                "scalebar": {
                    "color": (0, 0, 0),
                },
            },
            "modeler": {
                "disabled": {
                    "color": (211, 211, 211, 255),  # light grey
                },
                "action": {
                    "color": {
                        "valid": (180, 234, 154, 255),  # light green
                        "invalid": (255, 255, 255, 255),  # white
                        "running": (255, 0, 0, 255),  # red
                    },
                    "size": {
                        "width": 125,
                        "height": 50,
                    },
                    "width": {
                        "parameterized": 2,
                        "default": 1,
                    },
                },
                "data": {
                    "color": {
                        "raster": (215, 215, 248, 255),  # light blue
                        "raster3d": (215, 248, 215, 255),  # light green
                        "vector": (248, 215, 215, 255),  # light red
                        "dbtable": (255, 253, 194, 255),  # light yellow
                    },
                    "size": {
                        "width": 175,
                        "height": 50,
                    },
                },
                "loop": {
                    "color": {
                        "valid": (234, 226, 154, 255),  # dark yellow
                    },
                    "size": {
                        "width": 175,
                        "height": 40,
                    },
                },
                "if-else": {
                    "size": {
                        "width": 150,
                        "height": 40,
                    },
                },
                "comment": {
                    "color": (255, 233, 208, 255),  # light yellow
                    "size": {
                        "width": 200,
                        "height": 100,
                    },
                },
                "grassAPI": {"selection": 0},  # script package
            },
            "mapswipe": {
                "cursor": {
                    "color": (0, 0, 0, 255),
                    "size": 12,
                    "width": 1,
                    "type": {
                        "selection": 0,
                    },
                },
            },
            "animation": {
                "bgcolor": {
                    "color": (255, 255, 255, 255),
                },
                "nprocs": {
                    "value": -1,
                },
                "font": {
                    "bgcolor": (255, 255, 255, 255),
                    "fgcolor": (0, 0, 0, 255),
                },
                "temporal": {
                    "format": "%Y-%m-%d %H:%M:%S",
                    "nodata": {"enable": False},
                },
            },
        }

        # quick fix, https://trac.osgeo.org/grass/ticket/1233
        # TODO
        if sys.platform == "darwin":
            self.defaultSettings["general"]["defWindowPos"]["enabled"] = False

    def _internalSettings(self):
        """Define internal settings (based on user settings)"""
        self.internalSettings = {}
        for group in list(self.userSettings.keys()):
            self.internalSettings[group] = {}
            for key in list(self.userSettings[group].keys()):
                self.internalSettings[group][key] = {}

        # self.internalSettings['general']["mapsetPath"]['value'] = self.GetMapsetPath()
        self.internalSettings["appearance"]["elementListExpand"]["choices"] = (
            _("Collapse all except PERMANENT and current"),
            _("Collapse all except PERMANENT"),
            _("Collapse all except current"),
            _("Collapse all"),
            _("Expand all"),
        )

        self.internalSettings["language"]["locale"]["choices"] = tuple(self.locs)
        self.internalSettings["atm"]["leftDbClick"]["choices"] = (
            _("Edit selected record"),
            _("Display selected"),
        )

        self.internalSettings["cmd"]["verbosity"]["choices"] = (
            "grassenv",
            "verbose",
            "quiet",
        )

        self.internalSettings["appearance"]["iconTheme"]["choices"] = ("grass",)
        self.internalSettings["appearance"]["menustyle"]["choices"] = (
            _("Classic (labels only)"),
            _("Combined (labels and tool names)"),
            _("Expert (tool names only)"),
        )
        self.internalSettings["appearance"]["gSelectPopupHeight"]["min"] = 50
        # there is also maxHeight given to TreeCtrlComboPopup.GetAdjustedSize
        self.internalSettings["appearance"]["gSelectPopupHeight"]["max"] = 1000
        self.internalSettings["appearance"]["commandNotebook"]["choices"] = (
            _("Basic top"),
            _("Basic left"),
            _("List left"),
        )

        self.internalSettings["display"]["driver"]["choices"] = ["cairo", "png"]
        self.internalSettings["display"]["statusbarMode"][
            "choices"
        ] = None  # set during MapFrame init
        self.internalSettings["display"]["mouseWheelZoom"]["choices"] = (
            _("Zoom and recenter"),
            _("Zoom to mouse cursor"),
            _("Nothing"),
        )
        self.internalSettings["display"]["scrollDirection"]["choices"] = (
            _("Scroll forward to zoom in"),
            _("Scroll back to zoom in"),
        )

        self.internalSettings["nviz"]["view"] = {}
        self.internalSettings["nviz"]["view"]["twist"] = {}
        self.internalSettings["nviz"]["view"]["twist"]["min"] = -180
        self.internalSettings["nviz"]["view"]["twist"]["max"] = 180
        self.internalSettings["nviz"]["view"]["persp"] = {}
        self.internalSettings["nviz"]["view"]["persp"]["min"] = 1
        self.internalSettings["nviz"]["view"]["persp"]["max"] = 100
        self.internalSettings["nviz"]["view"]["height"] = {}
        self.internalSettings["nviz"]["view"]["height"]["value"] = -1
        self.internalSettings["nviz"]["view"]["z-exag"] = {}
        self.internalSettings["nviz"]["view"]["z-exag"]["llRatio"] = 1
        self.internalSettings["nviz"]["view"]["rotation"] = None
        self.internalSettings["nviz"]["view"]["focus"] = {}
        self.internalSettings["nviz"]["view"]["focus"]["x"] = -1
        self.internalSettings["nviz"]["view"]["focus"]["y"] = -1
        self.internalSettings["nviz"]["view"]["focus"]["z"] = -1
        self.internalSettings["nviz"]["view"]["dir"] = {}
        self.internalSettings["nviz"]["view"]["dir"]["x"] = -1
        self.internalSettings["nviz"]["view"]["dir"]["y"] = -1
        self.internalSettings["nviz"]["view"]["dir"]["z"] = -1
        self.internalSettings["nviz"]["view"]["dir"]["use"] = False

        for decor in ("arrow", "scalebar"):
            self.internalSettings["nviz"][decor] = {}
            self.internalSettings["nviz"][decor]["position"] = {}
            self.internalSettings["nviz"][decor]["position"]["x"] = 0
            self.internalSettings["nviz"][decor]["position"]["y"] = 0
            self.internalSettings["nviz"][decor]["size"] = 100
        self.internalSettings["nviz"]["vector"] = {}
        self.internalSettings["nviz"]["vector"]["points"] = {}
        self.internalSettings["nviz"]["vector"]["points"]["marker"] = (
            "x",
            _("box"),
            _("sphere"),
            _("cube"),
            _("diamond"),
            _("aster"),
            _("gyro"),
            _("histogram"),
        )
        self.internalSettings["vdigit"]["bgmap"] = {}
        self.internalSettings["vdigit"]["bgmap"]["value"] = ""

        self.internalSettings["mapswipe"]["cursor"]["type"] = {}
        self.internalSettings["mapswipe"]["cursor"]["type"]["choices"] = (
            _("cross"),
            _("box"),
            _("circle"),
        )

        self.internalSettings["modeler"]["grassAPI"]["choices"] = (
            _("Script package"),
            _("PyGRASS"),
        )

    def ReadSettingsFile(self, settings=None):
        """Reads settings file (mapset, location, gisdbase)"""
        if settings is None:
            settings = self.userSettings

        if os.path.exists(self.filePath):
            self._readFile(settings)
        elif os.path.exists(self.legacyFilePath):
            self._readLegacyFile(settings)

        # set environment variables
        font = self.Get(group="display", key="font", subkey="type")
        enc = self.Get(group="display", key="font", subkey="encoding")
        if font:
            os.environ["GRASS_FONT"] = font
        if enc:
            os.environ["GRASS_ENCODING"] = enc

    def _readFile(self, settings=None):
        """Read settings from file (wx.json) to dict,
        assumes file exists.

        :param settings: dict where to store settings (None for self.userSettings)
        """

        def update_nested_dict_by_dict(dictionary, update):
            """Recursively update nested dictionary by another nested dictionary"""
            for key, value in update.items():
                if isinstance(value, collections.abc.Mapping):
                    dictionary[key] = update_nested_dict_by_dict(
                        dictionary.get(key, {}), value
                    )
                else:
                    dictionary[key] = value
            return dictionary

        try:
            with open(self.filePath, "r") as f:
                update = json.load(f, object_hook=settings_JSON_decode_hook)
                update_nested_dict_by_dict(settings, update)
        except json.JSONDecodeError as e:
            sys.stderr.write(
                _("Unable to read settings file <{path}>:\n{err}").format(
                    path=self.filePath, err=e
                )
            )

    def _readLegacyFile(self, settings=None):
        """Read settings from legacy file (wx) to dict,
        assumes file exists.

        :param settings: dict where to store settings (None for self.userSettings)
        """
        if settings is None:
            settings = self.userSettings

        try:
            fd = open(self.legacyFilePath, "r")
        except OSError:
            sys.stderr.write(
                _("Unable to read settings file <%s>\n") % self.legacyFilePath
            )
            return

        try:
            line = ""
            for line in fd.readlines():
                line = line.rstrip("%s" % os.linesep)
                group, key = line.split(self.sep)[0:2]
                kv = line.split(self.sep)[2:]
                subkeyMaster = None
                if len(kv) % 2 != 0:  # multiple (e.g. nviz)
                    subkeyMaster = kv[0]
                    del kv[0]
                idx = 0
                while idx < len(kv):
                    if subkeyMaster:
                        subkey = [subkeyMaster, kv[idx]]
                    else:
                        subkey = kv[idx]
                    value = kv[idx + 1]
                    value = self._parseValue(value, read=True)
                    self.Append(settings, group, key, subkey, value)
                    idx += 2
        except ValueError as e:
            print(
                _(
                    "Error: Reading settings from file <%(file)s> failed.\n"
                    "\t\tDetails: %(detail)s\n"
                    "\t\tLine: '%(line)s'\n"
                )
                % {"file": self.legacyFilePath, "detail": e, "line": line},
                file=sys.stderr,
            )
            fd.close()

        fd.close()

    def SaveToFile(self, settings=None):
        """Save settings to the file"""
        if settings is None:
            settings = self.userSettings

        dirPath = GetSettingsPath()
        if not os.path.exists(dirPath):
            try:
                os.mkdir(dirPath)
            except:
                GError(_("Unable to create settings directory"))
                return
        try:
            with open(self.filePath, "w") as f:
                json.dump(settings, f, indent=2, cls=SettingsJSONEncoder)
        except OSError as e:
            raise GException(e)
        except Exception as e:
            raise GException(
                _(
                    "Writing settings to file <%(file)s> failed."
                    "\n\nDetails: %(detail)s"
                )
                % {"file": self.filePath, "detail": e}
            )
        return self.filePath

    def _parseValue(self, value, read=False):
        """Parse value to be store in settings file"""
        if read:  # -> read settings (cast values)
            if value == "True":
                value = True
            elif value == "False":
                value = False
            elif value == "None":
                value = None
            elif ":" in value:  # -> color
                try:
                    value = tuple(map(int, value.split(":")))
                except ValueError:  # -> string
                    pass
            else:
                try:
                    value = int(value)
                except ValueError:
                    try:
                        value = float(value)
                    except ValueError:
                        pass
        else:  # -> write settings
            if isinstance(value, type(())):  # -> color
                value = str(value[0]) + ":" + str(value[1]) + ":" + str(value[2])

        return value

    def Get(self, group, key=None, subkey=None, settings_type="user"):
        """Get value by key/subkey

        Raise KeyError if key is not found

        :param group: settings group
        :param key: (value, None)
        :param subkey: (value, list or None)
        :param settings_type: 'user', 'internal', 'default'

        :return: value
        """

        if settings_type == "user":
            settings = self.userSettings
        elif settings_type == "internal":
            settings = self.internalSettings
        else:
            settings = self.defaultSettings

        try:
            if subkey is None:
                if key is None:
                    return settings[group]
                else:
                    return settings[group][key]
            else:
                if isinstance(subkey, type(tuple())) or isinstance(
                    subkey, type(list())
                ):
                    return settings[group][key][subkey[0]][subkey[1]]
                else:
                    return settings[group][key][subkey]

        except KeyError:
            print(
                "Settings: unable to get value '%s:%s:%s'\n" % (group, key, subkey),
                file=sys.stderr,
            )

    def Set(self, group, value, key=None, subkey=None, settings_type="user"):
        """Set value of key/subkey

        Raise KeyError if group/key is not found

        :param group: settings group
        :param key: key (value, None)
        :param subkey: subkey (value, list or None)
        :param value: value
        :param settings_type: 'user', 'internal', 'default'
        """

        if settings_type == "user":
            settings = self.userSettings
        elif settings_type == "internal":
            settings = self.internalSettings
        else:
            settings = self.defaultSettings

        try:
            if subkey is None:
                if key is None:
                    settings[group] = value
                else:
                    settings[group][key] = value
            else:
                if isinstance(subkey, type(tuple())) or isinstance(
                    subkey, type(list())
                ):
                    settings[group][key][subkey[0]][subkey[1]] = value
                else:
                    settings[group][key][subkey] = value
        except KeyError:
            raise GException(
                "%s '%s:%s:%s'" % (_("Unable to set "), group, key, subkey)
            )

    def Append(self, dict, group, key, subkey, value, overwrite=True):
        """Set value of key/subkey

        Create group/key/subkey if not exists

        :param dict: settings dictionary to use
        :param group: settings group
        :param key: key
        :param subkey: subkey (value or list)
        :param value: value
        :param overwrite: True to overwrite existing value
        """

        hasValue = True
        if group not in dict:
            dict[group] = {}
            hasValue = False

        if key not in dict[group]:
            dict[group][key] = {}
            hasValue = False

        if isinstance(subkey, list):
            # TODO: len(subkey) > 2
            if subkey[0] not in dict[group][key]:
                dict[group][key][subkey[0]] = {}
                hasValue = False
            if subkey[1] not in dict[group][key][subkey[0]]:
                hasValue = False

            try:
                if overwrite or (not overwrite and not hasValue):
                    dict[group][key][subkey[0]][subkey[1]] = value
            except TypeError:
                print(
                    _("Unable to parse settings '%s'") % value
                    + " ("
                    + group
                    + ":"
                    + key
                    + ":"
                    + subkey[0]
                    + ":"
                    + subkey[1]
                    + ")",
                    file=sys.stderr,
                )
        else:
            if subkey not in dict[group][key]:
                hasValue = False

            try:
                if overwrite or (not overwrite and not hasValue):
                    dict[group][key][subkey] = value
            except TypeError:
                print(
                    _("Unable to parse settings '%s'") % value
                    + " ("
                    + group
                    + ":"
                    + key
                    + ":"
                    + subkey
                    + ")",
                    file=sys.stderr,
                )

    def GetDefaultSettings(self):
        """Get default user settings"""
        return self.defaultSettings

    def Reset(self, key=None):
        """Reset to default settings

        :param key: key in settings dict (None for all keys)
        """
        if not key:
            self.userSettings = copy.deepcopy(self.defaultSettings)
        else:
            self.userSettings[key] = copy.deepcopy(self.defaultSettings[key])


UserSettings = Settings()


def GetDisplayVectSettings():
    settings = list()
    if not UserSettings.Get(
        group="vectorLayer", key="featureColor", subkey=["transparent", "enabled"]
    ):
        featureColor = UserSettings.Get(
            group="vectorLayer", key="featureColor", subkey="color"
        )
        settings.append(
            "color=%s" % rgb2str.get(featureColor, ":".join(map(str, featureColor)))
        )
    else:
        settings.append("color=none")
    if not UserSettings.Get(
        group="vectorLayer", key="areaFillColor", subkey=["transparent", "enabled"]
    ):
        fillColor = UserSettings.Get(
            group="vectorLayer", key="areaFillColor", subkey="color"
        )
        settings.append(
            "fcolor=%s" % rgb2str.get(fillColor, ":".join(map(str, fillColor)))
        )
    else:
        settings.append("fcolor=none")

    settings.append(
        "width=%s" % UserSettings.Get(group="vectorLayer", key="line", subkey="width")
    )
    settings.append(
        "icon=%s" % UserSettings.Get(group="vectorLayer", key="point", subkey="symbol")
    )
    settings.append(
        "size=%s" % UserSettings.Get(group="vectorLayer", key="point", subkey="size")
    )
    types = []
    for ftype in ["point", "line", "boundary", "centroid", "area", "face"]:
        if UserSettings.Get(
            group="vectorLayer", key="showType", subkey=[ftype, "enabled"]
        ):
            types.append(ftype)
    settings.append("type=%s" % ",".join(types))

    if UserSettings.Get(group="vectorLayer", key="randomColors", subkey="enabled"):
        settings.append("-c")

    return settings
