use adw::prelude::*;
use gtk::glib;

/// Show the tutorial tour if the user hasn't completed it yet.
/// Called after the welcome wizard closes on first launch.
pub fn show_tutorial_if_needed(window: &adw::ApplicationWindow) {
    let config_store = pixstrip_core::storage::ConfigStore::new();
    if let Ok(cfg) = config_store.load()
        && cfg.tutorial_complete
    {
        return;
    }

    // Small delay to let the welcome dialog fully dismiss
    let win = window.clone();
    glib::timeout_add_local_once(std::time::Duration::from_millis(400), move || {
        show_tour_stop(&win, 0);
    });
}

/// Tour stops: (title, description, widget_name, popover_position)
fn tour_stops() -> Vec<(&'static str, &'static str, &'static str, gtk::PositionType)> {
    vec![
        (
            "Choose a Workflow",
            "Pick a preset that matches your needs, or scroll down to build a custom workflow from scratch.",
            "tour-content",
            gtk::PositionType::Bottom,
        ),
        (
            "Track Your Progress",
            "This bar shows where you are in the wizard. Click any completed step to jump back to it.",
            "tour-step-indicator",
            gtk::PositionType::Bottom,
        ),
        (
            "Navigation",
            "Use Back and Next to move between steps, or press Alt+Left / Alt+Right. Disabled steps are automatically skipped.",
            "tour-next-button",
            gtk::PositionType::Top,
        ),
        (
            "Main Menu",
            "Settings, keyboard shortcuts, processing history, and preset management live here.",
            "tour-menu-button",
            gtk::PositionType::Bottom,
        ),
        (
            "Get Help",
            "Every step has a help button with detailed guidance specific to that step.",
            "tour-help-button",
            gtk::PositionType::Bottom,
        ),
    ]
}

fn show_tour_stop(window: &adw::ApplicationWindow, index: usize) {
    let stops = tour_stops();
    let total = stops.len();
    if index >= total {
        mark_tutorial_complete();
        return;
    }

    let (title, description, widget_name, position) = stops[index];

    // Find the target widget by name in the widget tree
    let Some(root) = window.content() else { return };
    let Some(target) = find_widget_by_name(&root, widget_name) else {
        // Widget not found - skip to next stop
        show_tour_stop(window, index + 1);
        return;
    };

    // Build popover content
    let content = gtk::Box::builder()
        .orientation(gtk::Orientation::Vertical)
        .spacing(8)
        .margin_top(12)
        .margin_bottom(12)
        .margin_start(16)
        .margin_end(16)
        .build();
    content.set_size_request(280, -1);

    // Progress dots
    let dots_box = gtk::Box::builder()
        .orientation(gtk::Orientation::Horizontal)
        .spacing(6)
        .halign(gtk::Align::Center)
        .build();
    for i in 0..total {
        let dot = gtk::Label::builder()
            .label(if i == index { "\u{25CF}" } else { "\u{25CB}" })
            .build();
        if i == index {
            dot.add_css_class("accent");
        } else {
            dot.add_css_class("dim-label");
        }
        dots_box.append(&dot);
    }
    content.append(&dots_box);

    // Title
    let title_label = gtk::Label::builder()
        .label(title)
        .css_classes(["title-3"])
        .halign(gtk::Align::Start)
        .build();
    content.append(&title_label);

    // Description
    let desc_label = gtk::Label::builder()
        .label(description)
        .wrap(true)
        .max_width_chars(36)
        .halign(gtk::Align::Start)
        .xalign(0.0)
        .build();
    content.append(&desc_label);

    // Step counter
    let counter_label = gtk::Label::builder()
        .label(&format!("{} of {}", index + 1, total))
        .css_classes(["dim-label", "caption"])
        .halign(gtk::Align::Start)
        .build();
    content.append(&counter_label);

    // Buttons
    let button_box = gtk::Box::builder()
        .orientation(gtk::Orientation::Horizontal)
        .spacing(12)
        .halign(gtk::Align::End)
        .margin_top(4)
        .build();

    let skip_btn = gtk::Button::builder()
        .label("Skip Tour")
        .tooltip_text("Close the tour and start using Pixstrip")
        .build();
    skip_btn.add_css_class("flat");

    let is_last = index + 1 >= total;
    let next_btn = gtk::Button::builder()
        .label(if is_last { "Done" } else { "Next" })
        .tooltip_text(if is_last { "Finish the tour" } else { "Go to the next tour stop" })
        .build();
    next_btn.add_css_class("suggested-action");
    next_btn.add_css_class("pill");

    button_box.append(&skip_btn);
    button_box.append(&next_btn);
    content.append(&button_box);

    // Create popover attached to the target widget
    let popover = gtk::Popover::builder()
        .child(&content)
        .position(position)
        .autohide(false)
        .has_arrow(true)
        .build();
    popover.set_parent(&target);

    // For the content area (large widget), point to the upper portion
    // where the preset cards are visible
    if widget_name == "tour-content" {
        let w = target.width();
        if w > 0 {
            let rect = gtk::gdk::Rectangle::new(w / 2 - 10, 40, 20, 20);
            popover.set_pointing_to(Some(&rect));
        }
    }

    // Accessible label for screen readers
    popover.update_property(&[
        gtk::accessible::Property::Label(
            &format!("Tour step {} of {}: {}", index + 1, total, title)
        ),
    ]);

    // Wire skip button
    {
        let pop = popover.clone();
        skip_btn.connect_clicked(move |_| {
            mark_tutorial_complete();
            pop.popdown();
            let p = pop.clone();
            glib::idle_add_local_once(move || {
                p.unparent();
            });
        });
    }

    // Wire next button
    {
        let pop = popover.clone();
        let win = window.clone();
        next_btn.connect_clicked(move |_| {
            pop.popdown();
            let p = pop.clone();
            let w = win.clone();
            glib::idle_add_local_once(move || {
                p.unparent();
                if is_last {
                    mark_tutorial_complete();
                } else {
                    show_tour_stop(&w, index + 1);
                }
            });
        });
    }

    popover.popup();
}

/// Recursively search the widget tree for a widget with the given name.
fn find_widget_by_name(root: &gtk::Widget, name: &str) -> Option<gtk::Widget> {
    if root.widget_name().as_str() == name {
        return Some(root.clone());
    }
    let mut child = root.first_child();
    while let Some(c) = child {
        if let Some(found) = find_widget_by_name(&c, name) {
            return Some(found);
        }
        child = c.next_sibling();
    }
    None
}

fn mark_tutorial_complete() {
    let config_store = pixstrip_core::storage::ConfigStore::new();
    if let Ok(mut cfg) = config_store.load() {
        cfg.tutorial_complete = true;
        let _ = config_store.save(&cfg);
    }
}