// Map, wardley map editor for linux
// Copyright (C) 2026 Rubén Beltrán del Río

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

use gtk::prelude::*;
use relm4::Sender;
use relm4::gtk;

use crate::tr;
use crate::ui_helpers::create_switch_row;

use super::super::models::UserPreferences;
use super::super::window::PreferencesInput;

pub struct EditorPage {
    container: gtk::Box,
    font_size_spin: gtk::SpinButton,
    soft_wrap_switch: gtk::Switch,
    custom_font_switch: gtk::Switch,
    font_button: gtk::FontButton,
}

impl EditorPage {
    pub fn new(preferences: &UserPreferences, sender: &Sender<PreferencesInput>) -> Self {
        let container = gtk::Box::new(gtk::Orientation::Vertical, 20);
        container.set_margin_top(20);
        container.set_margin_bottom(20);
        container.set_margin_start(20);
        container.set_margin_end(20);
        container.set_valign(gtk::Align::Start);

        // Font Size section
        let font_size_label = gtk::Label::new(Some(&tr!("preferences.editor.font_size.title")));
        font_size_label.add_css_class("heading");
        font_size_label.set_halign(gtk::Align::Start);
        container.append(&font_size_label);

        let font_size_box = gtk::Box::new(gtk::Orientation::Horizontal, 10);
        let font_size_spin = gtk::SpinButton::with_range(7.0, 21.0, 1.0);
        font_size_spin.set_value(preferences.editor_font_size);
        {
            let sender = sender.clone();
            font_size_spin.connect_value_changed(move |spin| {
                sender.emit(PreferencesInput::SetEditorFontSize(spin.value()));
            });
        }
        font_size_box.append(&font_size_spin);
        font_size_box.append(&gtk::Label::new(Some(&tr!(
            "preferences.editor.font_size.unit"
        ))));
        container.append(&font_size_box);

        // Editor Style section
        let style_label = gtk::Label::new(Some(&tr!("preferences.editor.editor_style.title")));
        style_label.add_css_class("heading");
        style_label.set_halign(gtk::Align::Start);
        style_label.set_margin_top(10);
        container.append(&style_label);

        // Soft Wrap Lines
        let soft_wrap_row = create_switch_row(
            &tr!("preferences.editor.editor_style.soft_wrap_lines"),
            preferences.soft_wrap_lines,
        );
        let soft_wrap_switch = soft_wrap_row.1.clone();
        {
            let sender = sender.clone();
            soft_wrap_switch.connect_state_set(move |_, state| {
                sender.emit(PreferencesInput::SetSoftWrapLines(state));
                gtk::glib::Propagation::Proceed
            });
        }
        container.append(&soft_wrap_row.0);

        // Use Custom Font
        let custom_font_row = create_switch_row(
            &tr!("preferences.editor.editor_style.use_custom_font"),
            preferences.use_custom_editor_font,
        );
        let custom_font_switch = custom_font_row.1.clone();
        container.append(&custom_font_row.0);

        // Font selection
        let font_row = gtk::Box::new(gtk::Orientation::Horizontal, 10);
        font_row.append(&gtk::Label::new(Some(&tr!("preferences.editor.font"))));

        let font_button = gtk::FontButton::new();
        font_button.set_use_size(false);

        #[allow(clippy::cast_possible_truncation)]
        font_button.set_font(&format!(
            "{} {}",
            preferences.custom_editor_font_name, preferences.editor_font_size as i32
        ));
        font_button.set_sensitive(preferences.use_custom_editor_font);
        font_button.set_hexpand(true);
        font_button.set_use_font(true);
        {
            let sender = sender.clone();
            font_button.connect_font_set(move |button| {
                if let Some(font) = button.font() {
                    // Extract font family from the font string
                    let font_desc = gtk::pango::FontDescription::from_string(&font);
                    if let Some(family) = font_desc.family() {
                        sender.emit(PreferencesInput::SetCustomEditorFontName(
                            family.to_string(),
                        ));
                    }
                }
            });
        }
        font_row.append(&font_button);
        container.append(&font_row);

        // Connect custom font switch to font button sensitivity
        {
            let font_button_clone = font_button.clone();
            let sender = sender.clone();
            custom_font_switch.connect_state_set(move |_, state| {
                font_button_clone.set_sensitive(state);
                sender.emit(PreferencesInput::SetUseCustomEditorFont(state));
                gtk::glib::Propagation::Proceed
            });
        }

        Self {
            container,
            font_size_spin,
            soft_wrap_switch,
            custom_font_switch,
            font_button,
        }
    }

    pub fn widget(&self) -> gtk::Box {
        self.container.clone()
    }

    pub fn sync_from(&self, preferences: &UserPreferences) {
        self.font_size_spin.set_value(preferences.editor_font_size);
        self.soft_wrap_switch
            .set_active(preferences.soft_wrap_lines);
        self.custom_font_switch
            .set_active(preferences.use_custom_editor_font);
        self.font_button
            .set_sensitive(preferences.use_custom_editor_font);
        #[allow(clippy::cast_possible_truncation)] // Font size is always a small positive number
        self.font_button.set_font(&format!(
            "{} {}",
            preferences.custom_editor_font_name, preferences.editor_font_size as i32
        ));
    }
}