use crate::app::TextEditor;
use eframe::egui;

pub(crate) fn preferences_window(app: &mut TextEditor, ctx: &egui::Context) {
    let visuals = &ctx.style().visuals;
    let screen_rect = ctx.screen_rect();
    let window_width = (screen_rect.width() * 0.6).min(400.0).max(300.0);
    let window_height = (screen_rect.height() * 0.7).min(500.0).max(250.0);
    let max_size = egui::Vec2::new(window_width, window_height);

    egui::Window::new("Preferences")
        .collapsible(false)
        .resizable(false)
        .anchor(egui::Align2::CENTER_CENTER, egui::Vec2::ZERO)
        .default_open(true)
        .max_size(max_size)
        .frame(egui::Frame {
            fill: visuals.window_fill,
            stroke: visuals.window_stroke,
            corner_radius: egui::CornerRadius::same(8),
            shadow: visuals.window_shadow,
            inner_margin: egui::Margin::same(16),
            outer_margin: egui::Margin::same(0),
        })
        .show(ctx, |ui| {
            ui.vertical_centered(|ui| {
                ui.heading("Font Settings");
                ui.add_space(8.0);

                ui.horizontal(|ui| {
                    ui.label("Font Family:");
                    ui.add_space(5.0);

                    let mut changed = false;
                    egui::ComboBox::from_id_salt("font_family")
                        .selected_text(&app.font_family)
                        .show_ui(ui, |ui| {
                            if ui
                                .selectable_value(
                                    &mut app.font_family,
                                    "Proportional".to_string(),
                                    "Proportional",
                                )
                                .clicked()
                            {
                                changed = true;
                            }
                            if ui
                                .selectable_value(
                                    &mut app.font_family,
                                    "Monospace".to_string(),
                                    "Monospace",
                                )
                                .clicked()
                            {
                                changed = true;
                            }
                        });

                    if changed {
                        app.apply_font_settings_with_ui(ctx, ui);
                    }
                });

                ui.add_space(8.0);

                ui.horizontal(|ui| {
                    ui.label("Font Size:");
                    ui.add_space(5.0);

                    if app.font_size_input.is_none() {
                        app.font_size_input = Some(app.font_size.to_string());
                    }

                    let mut font_size_text = app
                        .font_size_input
                        .as_ref()
                        .unwrap_or(&"14".to_string())
                        .clone();
                    let response = ui.add(
                        egui::TextEdit::singleline(&mut font_size_text)
                            .desired_width(50.0)
                            .hint_text("14")
                            .id(egui::Id::new("font_size_input")),
                    );

                    app.font_size_input = Some(font_size_text.clone());

                    if response.clicked() {
                        response.request_focus();
                    }

                    ui.label("px");

                    if response.lost_focus() {
                        if let Ok(new_size) = font_size_text.parse::<f32>() {
                            let clamped_size = new_size.clamp(8.0, 32.0);
                            if (app.font_size - clamped_size).abs() > 0.1 {
                                app.font_size = clamped_size;
                                app.apply_font_settings_with_ui(ctx, ui);
                            }
                        }
                        app.font_size_input = None;
                    }
                });

                ui.add_space(12.0);

                ui.separator();
                ui.add_space(8.0);
                ui.label("Preview:");
                ui.add_space(4.0);

                egui::ScrollArea::vertical()
                    .max_height(150.0)
                    .show(ui, |ui| {
                        egui::Frame::new()
                            .fill(visuals.code_bg_color)
                            .stroke(visuals.widgets.noninteractive.bg_stroke)
                            .inner_margin(egui::Margin::same(8))
                            .show(ui, |ui| {
                                let preview_font = egui::FontId::new(
                                    app.font_size,
                                    match app.font_family.as_str() {
                                        "Monospace" => egui::FontFamily::Monospace,
                                        _ => egui::FontFamily::Proportional,
                                    },
                                );
                                ui.label(
                                    egui::RichText::new(
                                        "The quick brown fox jumps over the lazy dog.",
                                    )
                                    .font(preview_font.clone()),
                                );
                                ui.label(
                                    egui::RichText::new("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
                                        .font(preview_font.clone()),
                                );
                                ui.label(
                                    egui::RichText::new("abcdefghijklmnopqrstuvwxyz")
                                        .font(preview_font.clone()),
                                );
                                ui.label(
                                    egui::RichText::new("1234567890 !@#$%^&*()").font(preview_font),
                                );
                            });
                    });

                ui.add_space(12.0);

                if ui.button("Close").clicked() {
                    app.show_preferences = false;
                    app.font_size_input = None;
                }
            });
        });
}