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

pub(crate) fn find_window(app: &mut TextEditor, ctx: &egui::Context) {
    let visuals = &ctx.style().visuals;

    let mut should_close = false;
    let mut query_changed = false;

    egui::Window::new("Find")
        .collapsible(false)
        .resizable(false)
        .movable(true)
        .anchor(egui::Align2::CENTER_CENTER, egui::Vec2::ZERO)
        .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(|ui| {
                ui.set_min_width(300.0);

                ui.horizontal(|ui| {
                    ui.label("Find:");
                    let response = ui.add(
                        egui::TextEdit::singleline(&mut app.find_query)
                            .desired_width(200.0)
                            .hint_text("Enter search text..."),
                    );

                    if response.changed() {
                        query_changed = true;
                    }

                    if !response.has_focus() {
                        response.request_focus();
                    }

                    if response.lost_focus() && ui.input(|i| i.key_pressed(egui::Key::Enter)) {
                        app.find_next();
                        response.request_focus();
                    }
                });

                ui.add_space(8.0);

                ui.horizontal(|ui| {
                    let case_sensitive_changed = ui
                        .checkbox(&mut app.case_sensitive_search, "Case sensitive")
                        .changed();
                    if case_sensitive_changed {
                        query_changed = true;
                    }
                });

                ui.add_space(8.0);

                ui.horizontal(|ui| {
                    let match_text = if app.find_matches.is_empty() {
                        if app.find_query.is_empty() {
                            "".to_string()
                        } else {
                            "No matches found".to_string()
                        }
                    } else if let Some(current) = app.current_match_index {
                        format!("{} of {} matches", current + 1, app.find_matches.len())
                    } else {
                        format!("{} matches found", app.find_matches.len())
                    };

                    ui.label(egui::RichText::new(match_text).weak());

                    ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
                        if ui.button("✕").clicked() {
                            should_close = true;
                        }

                        ui.add_space(4.0);

                        let next_enabled = !app.find_matches.is_empty();
                        ui.add_enabled_ui(next_enabled, |ui| {
                            if ui.button("Next").clicked() {
                                app.find_next();
                            }
                        });

                        let prev_enabled = !app.find_matches.is_empty();
                        ui.add_enabled_ui(prev_enabled, |ui| {
                            if ui.button("Previous").clicked() {
                                app.find_previous();
                            }
                        });
                    });
                });
            });
        });

    if query_changed {
        app.update_find_matches();
    }

    if should_close {
        app.show_find = false;
    }

    ctx.input(|i| {
        if i.key_pressed(egui::Key::Escape) {
            app.show_find = false;
        } else if i.key_pressed(egui::Key::F3) {
            if i.modifiers.shift {
                app.find_previous();
            } else {
                app.find_next();
            }
        }
    });
}