"""Widget generators and their signal handlers"""
# Standard Library
# pylint: disable=no-member,too-many-public-methods
import os
import urllib
from gettext import gettext as _

# Third Party Libraries
from gi.repository import Gdk, Gtk

# Lutris Modules
from lutris import settings, sysoptions
from lutris.gui.dialogs import ErrorDialog
from lutris.gui.widgets.common import EditableGrid, FileChooserEntry, Label, VBox
from lutris.gui.widgets.searchable_combobox import SearchableCombobox
from lutris.runners import InvalidRunner, import_runner
from lutris.util.jobs import AsyncCall
from lutris.util.log import logger


class ConfigBox(VBox):

    """Dynamically generate a vbox built upon on a python dict."""

    def __init__(self, game=None):
        super().__init__()
        self.options = []
        self.game = game
        self.config = None
        self.raw_config = None
        self.option_widget = None
        self.wrapper = None
        self.tooltip_default = None
        self.files = []
        self.files_list_store = None

    def generate_top_info_box(self, text):
        """Add a top section with general help text for the current tab"""
        help_box = Gtk.Box()
        help_box.set_margin_left(15)
        help_box.set_margin_right(15)
        help_box.set_margin_bottom(5)

        icon = Gtk.Image.new_from_icon_name("dialog-information", Gtk.IconSize.MENU)
        help_box.pack_start(icon, False, False, 5)

        title_label = Gtk.Label("<i>%s</i>" % text)
        title_label.set_line_wrap(True)
        title_label.set_alignment(0, 0.5)
        title_label.set_use_markup(True)
        help_box.pack_start(title_label, False, False, 5)

        self.pack_start(help_box, False, False, 0)
        self.pack_start(Gtk.HSeparator(), False, False, 12)

        help_box.show_all()

    def generate_widgets(self, config_section):  # noqa: C901 # pylint: disable=too-many-branches,too-many-statements
        """Parse the config dict and generates widget accordingly."""
        if not self.options:
            no_options_label = Label(_("No options available"))
            no_options_label.set_halign(Gtk.Align.CENTER)
            no_options_label.set_valign(Gtk.Align.CENTER)
            self.pack_start(no_options_label, True, True, 0)
            return

        # Select config section.
        if config_section == "game":
            self.config = self.lutris_config.game_config
            self.raw_config = self.lutris_config.raw_game_config
        elif config_section == "runner":
            self.config = self.lutris_config.runner_config
            self.raw_config = self.lutris_config.raw_runner_config
        elif config_section == "system":
            self.config = self.lutris_config.system_config
            self.raw_config = self.lutris_config.raw_system_config

        # Go thru all options.
        for option in self.options:
            if "scope" in option:
                if config_section not in option["scope"]:
                    continue
            option_key = option["option"]
            value = self.config.get(option_key)
            default = option.get("default")

            if callable(option.get("choices")) and option["type"] != "choice_with_search":
                option["choices"] = option["choices"]()
            if callable(option.get("condition")):
                option["condition"] = option["condition"]()

            self.wrapper = Gtk.Box()
            self.wrapper.set_spacing(12)
            self.wrapper.set_margin_bottom(6)

            # Set tooltip's "Default" part
            default = option.get("default")
            self.tooltip_default = default if isinstance(default, str) else None

            # Generate option widget
            self.option_widget = None
            self.call_widget_generator(option, option_key, value, default)

            # Reset button
            reset_btn = Gtk.Button.new_from_icon_name("edit-clear", Gtk.IconSize.MENU)
            reset_btn.set_valign(Gtk.Align.CENTER)
            reset_btn.set_margin_bottom(6)
            reset_btn.set_relief(Gtk.ReliefStyle.NONE)
            reset_btn.set_tooltip_text(_("Reset option to global or default config"))
            reset_btn.connect(
                "clicked",
                self.on_reset_button_clicked,
                option,
                self.option_widget,
                self.wrapper,
            )

            placeholder = Gtk.Box()
            placeholder.set_size_request(32, 32)

            if option_key not in self.raw_config:
                reset_btn.set_visible(False)
                reset_btn.set_no_show_all(True)
            placeholder.pack_start(reset_btn, False, False, 0)

            # Tooltip
            helptext = option.get("help")
            if isinstance(self.tooltip_default, str):
                helptext = helptext + "\n\n" if helptext else ""
                helptext += _("<b>Default</b>: ") + _(self.tooltip_default)
            if value != default and option_key not in self.raw_config:
                helptext = helptext + "\n\n" if helptext else ""
                helptext += _(
                    "<i>(Italic indicates that this option is "
                    "modified in a lower configuration level.)</i>"
                )
            if helptext:
                self.wrapper.props.has_tooltip = True
                self.wrapper.connect("query-tooltip", self.on_query_tooltip, helptext)

            hbox = Gtk.Box()
            hbox.set_margin_left(18)
            hbox.pack_end(placeholder, False, False, 5)
            # Grey out option if condition unmet
            if "condition" in option and not option["condition"]:
                hbox.set_sensitive(False)

            # Hide if advanced
            if option.get("advanced"):
                hbox.get_style_context().add_class("advanced")
                show_advanced = settings.read_setting("show_advanced_options")
                if show_advanced != "True":
                    hbox.set_no_show_all(True)
            hbox.pack_start(self.wrapper, True, True, 0)
            self.pack_start(hbox, False, False, 0)

    def call_widget_generator(self, option, option_key, value, default):  # noqa: C901
        """Call the right generation method depending on option type."""
        # pylint: disable=too-many-branches
        option_type = option["type"]
        option_size = option.get("size", None)

        if option_key in self.raw_config:
            self.set_style_property("font-weight", "bold", self.wrapper)
        elif value != default:
            self.set_style_property("font-style", "italic", self.wrapper)

        if option_type == "choice":
            self.generate_combobox(option_key, option["choices"], option["label"], value, default)

        elif option_type == "choice_with_entry":
            self.generate_combobox(
                option_key,
                option["choices"],
                option["label"],
                value,
                default,
                has_entry=True,
            )
        elif option_type == "choice_with_search":
            self.generate_searchable_combobox(
                option_key,
                option["choices"],
                option["label"],
                value,
                default,
            )

        elif option_type == "bool":
            self.generate_checkbox(option, value)
            self.tooltip_default = "Enabled" if default else "Disabled"
        elif option_type == "extended_bool":
            self.generate_checkbox_with_callback(option, value)
            self.tooltip_default = "Enabled" if default else "Disabled"
        elif option_type == "range":
            self.generate_range(option_key, option["min"], option["max"], option["label"], value)
        elif option_type == "string":
            if "label" not in option:
                raise ValueError("Option %s has no label" % option)
            self.generate_entry(option_key, option["label"], value, option_size)
        elif option_type == "directory_chooser":
            self.generate_directory_chooser(option, value)
        elif option_type == "file":
            self.generate_file_chooser(option, value)
        elif option_type == "multiple":
            self.generate_multiple_file_chooser(option_key, option["label"], value)
        elif option_type == "label":
            self.generate_label(option["label"])
        elif option_type == "mapping":
            self.generate_editable_grid(option_key, label=option["label"], value=value)
        else:
            raise ValueError("Unknown widget type %s" % option_type)

    # Label
    def generate_label(self, text):
        """Generate a simple label."""
        label = Label(text)
        label.set_use_markup(True)
        label.set_halign(Gtk.Align.START)
        label.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(label, True, True, 0)

    # Checkbox
    def generate_checkbox(self, option, value=None):
        """Generate a checkbox."""

        label = Label(option["label"])
        self.wrapper.pack_start(label, False, False, 0)

        switch = Gtk.Switch()
        if value is True:
            switch.set_active(value)
        switch.connect("notify::active", self.checkbox_toggle, option["option"])
        switch.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(switch, False, False, 0)
        self.option_widget = switch

    # Checkbox with callback
    def generate_checkbox_with_callback(self, option, value=None):
        """Generate a checkbox. With callback"""

        label = Label(option["label"])
        self.wrapper.pack_start(label, False, False, 0)

        checkbox = Gtk.Switch()
        checkbox.set_sensitive(option["active"] is True)
        if value is True:
            checkbox.set_active(value)

        checkbox.connect("notify::active", self._on_toggle_with_callback, option)
        checkbox.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(checkbox, False, False, 0)
        self.option_widget = checkbox

    def checkbox_toggle(self, widget, _gparam, option_name):
        """Action for the checkbox's toggled signal."""
        self.option_changed(widget, option_name, widget.get_active())

    def _on_toggle_with_callback(self, widget, _gparam, option):
        """Action for the checkbox's toggled signal. With callback method"""

        option_name = option["option"]
        callback = option["callback"]
        callback_on = option.get("callback_on")
        if widget.get_active() == callback_on or callback_on is None:
            AsyncCall(callback, self._on_callback_finished, widget, option, self.config)
        else:
            self.option_changed(widget, option_name, widget.get_active())

    def _on_callback_finished(self, result, error):
        if error:
            ErrorDialog(str(error), parent=self.get_toplevel())
            return

        widget, option, response = result
        if response:
            self.option_changed(widget, option["option"], widget.get_active())
        else:
            widget.set_active(False)

    # Entry
    def generate_entry(self, option_name, label, value=None, option_size=None):
        """Generate an entry box."""
        label = Label(label)
        self.wrapper.pack_start(label, False, False, 0)

        entry = Gtk.Entry()
        if value:
            entry.set_text(value)
        entry.connect("changed", self.entry_changed, option_name)
        expand = option_size != "small"
        self.wrapper.pack_start(entry, expand, expand, 0)
        self.option_widget = entry

    def entry_changed(self, entry, option_name):
        """Action triggered for entry 'changed' signal."""
        self.option_changed(entry, option_name, entry.get_text())

    def generate_searchable_combobox(self, option_name, choice_func, label, value, default):
        """Generate a searchable combo box"""
        combobox = SearchableCombobox(choice_func, value or default)
        combobox.connect("changed", self.on_searchable_entry_changed, option_name)
        self.wrapper.pack_start(Label(label), False, False, 0)
        self.wrapper.pack_start(combobox, True, True, 0)
        self.option_widget = combobox

    def on_searchable_entry_changed(self, combobox, value, key):
        self.option_changed(combobox, key, value)

    def _populate_combobox_choices(self, liststore, choices, default):
        for choice in choices:
            if isinstance(choice, str):
                choice = (choice, choice)
            if choice[1] == default:
                liststore.append((_("%s (default)") % choice[0], choice[1]))
                self.tooltip_default = choice[0]
            else:
                liststore.append(choice)

    # ComboBox
    def generate_combobox(self, option_name, choices, label, value=None, default=None, has_entry=False):
        """Generate a combobox (drop-down menu)."""
        liststore = Gtk.ListStore(str, str)
        self._populate_combobox_choices(liststore, choices, default)
        # With entry ("choice_with_entry" type)
        if has_entry:
            combobox = Gtk.ComboBox.new_with_model_and_entry(liststore)
            combobox.set_entry_text_column(0)
            if value:
                combobox.get_child().set_text(value)
        # No entry ("choice" type)
        else:
            combobox = Gtk.ComboBox.new_with_model(liststore)
            cell = Gtk.CellRendererText()
            combobox.pack_start(cell, True)
            combobox.add_attribute(cell, "text", 0)
            combobox.set_id_column(1)

            choices = list(v for k, v in choices)
            if value in choices:
                combobox.set_active_id(value)
            else:
                combobox.set_active_id(default)

        combobox.connect("changed", self.on_combobox_change, option_name)
        combobox.connect("scroll-event", self._on_combobox_scroll)
        label = Label(label)
        combobox.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(label, False, False, 0)
        self.wrapper.pack_start(combobox, True, True, 0)
        self.option_widget = combobox

    @staticmethod
    def _on_combobox_scroll(combobox, _event):
        """Prevents users from accidentally changing configuration values
        while scrolling down dialogs.
        """
        combobox.stop_emission_by_name("scroll-event")
        return False

    def on_combobox_change(self, combobox, option):
        """Action triggered on combobox 'changed' signal."""
        list_store = combobox.get_model()
        active = combobox.get_active()
        option_value = None
        if active < 0:
            if combobox.get_has_entry():
                option_value = combobox.get_child().get_text()
        else:
            option_value = list_store[active][1]
        self.option_changed(combobox, option, option_value)

    # Range
    def generate_range(self, option_name, min_val, max_val, label, value=None):
        """Generate a ranged spin button."""
        adjustment = Gtk.Adjustment(float(min_val), float(min_val), float(max_val), 1, 0, 0)
        spin_button = Gtk.SpinButton()
        spin_button.set_adjustment(adjustment)
        if value:
            spin_button.set_value(value)
        spin_button.connect("changed", self.on_spin_button_changed, option_name)
        label = Label(label)
        self.wrapper.pack_start(label, False, False, 0)
        self.wrapper.pack_start(spin_button, True, True, 0)
        self.option_widget = spin_button

    def on_spin_button_changed(self, spin_button, option):
        """Action triggered on spin button 'changed' signal."""
        value = spin_button.get_value_as_int()
        self.option_changed(spin_button, option, value)

    # File chooser
    def generate_file_chooser(self, option, path=None):
        """Generate a file chooser button to select a file."""
        option_name = option["option"]
        label = Label(option["label"])
        default_path = option.get("default_path") or (self.runner.default_path if self.runner else "")
        file_chooser = FileChooserEntry(
            title=_("Select file"),
            action=Gtk.FileChooserAction.OPEN,
            path=path,
            default_path=default_path
        )
        # file_chooser.set_size_request(200, 30)

        if "default_path" in option:
            default_path = self.lutris_config.system_config.get(option["default_path"])
            if default_path and os.path.exists(default_path):
                file_chooser.entry.set_text(default_path)

        if path:
            # If path is relative, complete with game dir
            if not os.path.isabs(path):
                path = os.path.expanduser(path)
                if not os.path.isabs(path):
                    if self.game and self.game.directory:
                        path = os.path.join(self.game.directory, path)
            file_chooser.entry.set_text(path)

        file_chooser.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(label, False, False, 0)
        self.wrapper.pack_start(file_chooser, True, True, 0)
        self.option_widget = file_chooser
        file_chooser.entry.connect("changed", self._on_chooser_file_set, option_name)

    def _on_chooser_file_set(self, entry, option):
        """Action triggered when the field's content changes."""
        text = entry.get_text()
        if text.startswith('file:///'):
            text = urllib.parse.unquote(text[len('file://'):])
        if not os.path.isabs(text):
            text = os.path.expanduser(text)
        if text != entry.get_text():
            entry.set_text(text)
        self.option_changed(entry.get_parent(), option, text)

    # Directory chooser
    def generate_directory_chooser(self, option, path=None):
        """Generate a file chooser button to select a directory."""
        label = Label(option["label"])
        option_name = option["option"]
        default_path = None
        if not path and self.game and self.game.runner:
            default_path = self.game.runner.working_dir
        directory_chooser = FileChooserEntry(
            title=_("Select folder"), action=Gtk.FileChooserAction.SELECT_FOLDER, path=path, default_path=default_path
        )
        directory_chooser.entry.connect("changed", self._on_chooser_dir_set, option_name)
        directory_chooser.set_valign(Gtk.Align.CENTER)
        self.wrapper.pack_start(label, False, False, 0)
        self.wrapper.pack_start(directory_chooser, True, True, 0)
        self.option_widget = directory_chooser

    def _on_chooser_dir_set(self, entry, option):
        """Action triggered when the field's content changes."""
        text = entry.get_text()
        if text.startswith('file:///'):
            text = urllib.parse.unquote(text[len('file://'):])
        if text != entry.get_text():
            entry.set_text(text)
        self.option_changed(entry.get_parent(), option, text)

    # Editable grid
    def generate_editable_grid(self, option_name, label, value=None):
        """Adds an editable grid widget"""
        value = value or {}
        try:
            value = list(value.items())
        except AttributeError:
            logger.error("Invalid value of type %s passed to grid widget: %s", type(value), value)
            value = {}
        label = Label(label)

        grid = EditableGrid(value, columns=["Key", "Value"])
        grid.connect("changed", self._on_grid_changed, option_name)
        self.wrapper.pack_start(label, False, False, 0)
        self.wrapper.pack_start(grid, True, True, 0)
        self.option_widget = grid
        return grid

    def _on_grid_changed(self, grid, option):
        values = dict(grid.get_data())
        self.option_changed(grid, option, values)

    # Multiple file selector
    def generate_multiple_file_chooser(self, option_name, label, value=None):
        """Generate a multiple file selector."""
        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
        label = Label(label + ":")
        label.set_halign(Gtk.Align.START)
        button = Gtk.Button(_("Add files"))
        button.connect("clicked", self.on_add_files_clicked, option_name, value)
        button.set_margin_left(10)
        vbox.pack_start(label, False, False, 5)
        vbox.pack_end(button, False, False, 0)

        if value:
            if isinstance(value, str):
                self.files = [value]
            else:
                self.files = value
        else:
            self.files = []
        self.files_list_store = Gtk.ListStore(str)
        for filename in self.files:
            self.files_list_store.append([filename])
        cell_renderer = Gtk.CellRendererText()
        files_treeview = Gtk.TreeView(self.files_list_store)
        files_column = Gtk.TreeViewColumn(_("Files"), cell_renderer, text=0)
        files_treeview.append_column(files_column)
        files_treeview.connect("key-press-event", self.on_files_treeview_keypress, option_name)
        treeview_scroll = Gtk.ScrolledWindow()
        treeview_scroll.set_min_content_height(130)
        treeview_scroll.set_margin_left(10)
        treeview_scroll.set_shadow_type(Gtk.ShadowType.ETCHED_IN)
        treeview_scroll.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
        treeview_scroll.add(files_treeview)

        vbox.pack_start(treeview_scroll, True, True, 0)
        self.wrapper.pack_start(vbox, True, True, 0)
        self.option_widget = self.files_list_store

    def on_add_files_clicked(self, _widget, option_name, value):
        """Create and run multi-file chooser dialog."""
        dialog = Gtk.FileChooserNative.new(
            _("Select files"),
            None,
            Gtk.FileChooserAction.OPEN,
            _("_Add"),
            _("_Cancel"),
        )
        dialog.set_select_multiple(True)

        first_file_dir = os.path.dirname(value[0]) if value else None
        dialog.set_current_folder(
            first_file_dir or self.game.directory or self.config.get("game_path") or os.path.expanduser("~")
        )
        response = dialog.run()
        if response == Gtk.ResponseType.ACCEPT:
            self.add_files_to_treeview(dialog, option_name, self.wrapper)
        dialog.destroy()

    def add_files_to_treeview(self, dialog, option, wrapper):
        """Add several files to the configuration"""
        filenames = dialog.get_filenames()
        files = self.config.get(option, [])
        for filename in filenames:
            self.files_list_store.append([filename])
            if filename not in files:
                files.append(filename)
        self.option_changed(wrapper, option, files)

    def on_files_treeview_keypress(self, treeview, event, option):
        """Action triggered when a row is deleted from the filechooser."""
        key = event.keyval
        if key == Gdk.KEY_Delete:
            selection = treeview.get_selection()
            (model, treepaths) = selection.get_selected_rows()
            for treepath in treepaths:
                row_index = int(str(treepath))
                treeiter = model.get_iter(treepath)
                model.remove(treeiter)
                self.raw_config[option].pop(row_index)

    @staticmethod
    def on_query_tooltip(_widget, x, y, keybmode, tooltip, text):  # pylint: disable=unused-argument
        """Prepare a custom tooltip with a fixed width"""
        label = Label(text)
        label.set_use_markup(True)
        label.set_max_width_chars(60)
        hbox = Gtk.Box()
        hbox.pack_start(label, False, False, 0)
        hbox.show_all()
        tooltip.set_custom(hbox)
        return True

    def option_changed(self, widget, option_name, value):
        """Common actions when value changed on a widget"""
        self.raw_config[option_name] = value
        self.config[option_name] = value

        wrapper = widget.get_parent()
        hbox = wrapper.get_parent()

        # Dirty way to get the reset btn. I tried passing it through the
        # methods but got some strange unreliable behavior.
        reset_btn = hbox.get_children()[1].get_children()[0]
        reset_btn.set_visible(True)
        self.set_style_property("font-weight", "bold", wrapper)

    def on_reset_button_clicked(self, btn, option, _widget, wrapper):
        """Clear option (remove from config, reset option widget)."""
        option_key = option["option"]
        current_value = self.config[option_key]

        btn.set_visible(False)
        self.set_style_property("font-weight", "normal", wrapper)
        self.raw_config.pop(option_key)
        self.lutris_config.update_cascaded_config()

        reset_value = self.config.get(option_key)
        if current_value == reset_value:
            return

        # Destroy and recreate option widget
        self.wrapper = wrapper
        children = wrapper.get_children()
        for child in children:
            child.destroy()
        self.call_widget_generator(option, option_key, reset_value, option.get("default"))
        self.wrapper.show_all()

    @staticmethod
    def set_style_property(property_, value, wrapper):
        """Add custom style."""
        style_provider = Gtk.CssProvider()
        style_provider.load_from_data("GtkHBox {{{}: {};}}".format(property_, value).encode())
        style_context = wrapper.get_style_context()
        style_context.add_provider(style_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)


class GameBox(ConfigBox):

    def __init__(self, lutris_config, game):
        ConfigBox.__init__(self, game)
        self.lutris_config = lutris_config
        if game.runner_name:
            if not game.runner:
                try:
                    self.runner = import_runner(game.runner_name)()
                except InvalidRunner:
                    self.runner = None
            else:
                self.runner = game.runner
            if self.runner:
                self.options = self.runner.game_options
        else:
            logger.warning("No runner in game supplied to GameBox")
        self.generate_widgets("game")


class RunnerBox(ConfigBox):

    """Configuration box for runner specific options"""

    def __init__(self, lutris_config, game=None):
        ConfigBox.__init__(self, game)
        self.lutris_config = lutris_config
        try:
            self.runner = import_runner(self.lutris_config.runner_slug)()
        except InvalidRunner:
            self.runner = None
        if self.runner:
            self.options = self.runner.get_runner_options()

        if lutris_config.level == "game":
            self.generate_top_info_box(_(
                "If modified, these options supersede the same options from "
                "the base runner configuration."
            ))
        self.generate_widgets("runner")


class SystemBox(ConfigBox):

    def __init__(self, lutris_config):
        ConfigBox.__init__(self)
        self.lutris_config = lutris_config
        self.runner = None
        runner_slug = self.lutris_config.runner_slug

        if runner_slug:
            self.options = sysoptions.with_runner_overrides(runner_slug)
        else:
            self.options = sysoptions.system_options

        if lutris_config.game_config_id and runner_slug:
            self.generate_top_info_box(_(
                "If modified, these options supersede the same options from "
                "the base runner configuration, which themselves supersede "
                "the global preferences."
            ))
        elif runner_slug:
            self.generate_top_info_box(_(
                "If modified, these options supersede the same options from "
                "the global preferences."
            ))

        self.generate_widgets("system")
