// Config → CSS. All theming (färger, transparens, skuggor, accent,
// storlekar, animationer) genereras här och laddas i en CssProvider som
// byts ut vid live-omladdning. Skärmar med per-skärm-överridar får egna
// CSS-block scopade på dockfönstrets output-klass (o-<connector>).

use gtk4 as gtk;
use gtk4::gdk;

use crate::config::{Config, IndicatorStyle};

/// CSS-klass för en viss skärms dockfönster.
pub fn output_class(connector: &str) -> String {
    let safe: String = connector
        .chars()
        .map(|c| if c.is_ascii_alphanumeric() { c } else { '-' })
        .collect();
    format!("o-{safe}")
}

/// "#rrggbb" + alpha → "rgba(r, g, b, a)". Trasig färg → grå.
fn rgba(hex: &str, alpha: f64) -> String {
    let h = hex.trim_start_matches('#');
    let (r, g, b) = if h.len() == 6 {
        (
            u8::from_str_radix(&h[0..2], 16).unwrap_or(0x88),
            u8::from_str_radix(&h[2..4], 16).unwrap_or(0x88),
            u8::from_str_radix(&h[4..6], 16).unwrap_or(0x88),
        )
    } else {
        (0x88, 0x88, 0x88)
    };
    format!("rgba({r}, {g}, {b}, {alpha:.3})")
}

/// De utseende-styrda reglerna, med valfritt selektor-prefix
/// ("" globalt, "window.o-DP-1 " för en enskild skärm).
fn css_body(cfg: &Config, p: &str) -> String {
    let a = &cfg.appearance;
    let bg = rgba(&a.background, a.opacity);
    let border = rgba(&a.border.color, a.border.opacity);
    let accent = rgba(&a.accent, 1.0);
    let accent_soft = rgba(&a.accent, 0.28);
    let shadow = if a.shadow.enabled {
        format!(
            "box-shadow: 0 2px {}px {};",
            a.shadow.blur,
            rgba("#000000", a.shadow.opacity)
        )
    } else {
        String::new()
    };
    let transition = if a.animations {
        "transition: all 150ms ease;"
    } else {
        "transition: none;"
    };
    let hover_zoom = if a.hover_zoom { "-gtk-icon-transform: scale(1.15);" } else { "" };
    let item_pad = (a.icon_spacing / 2).max(0);
    let (ind_w, ind_h, ind_radius) = match a.indicator.style {
        IndicatorStyle::Dot => (5, 5, 3),
        IndicatorStyle::Line => (16, 3, 2),
        IndicatorStyle::None => (0, 0, 0),
    };

    format!(
        r#"
{p}.dock-panel {{
    background-color: {bg};
    border-radius: {radius}px;
    border: {bwidth}px solid {border};
    padding: {padding}px;
    {shadow}
}}

{p}.dock-item {{
    background: transparent;
    border: none;
    border-radius: {item_radius}px;
    padding: 4px;
    margin: 0 {item_pad}px;
    min-width: {icon}px;
    min-height: {icon}px;
    {transition}
}}

{p}.dock-item:hover {{
    background-color: {accent_soft};
}}

{p}.dock-item:hover image {{
    {hover_zoom}
}}

{p}.dock-item image {{
    {transition}
}}

{p}.dock-item.urgent {{
    background-color: {accent_soft};
    animation: waydock-pulse 900ms ease-in-out infinite alternate;
}}

{p}.indicator-box {{
    min-height: {ind_h}px;
}}

{p}.indicator {{
    background-color: {accent};
    border-radius: {ind_radius}px;
    min-width: {ind_w}px;
    min-height: {ind_h}px;
    margin: 0 1px;
}}

{p}.indicator.inactive {{
    background-color: {accent_dim};
}}

{p}.group-badge {{
    background-color: {accent};
    color: #ffffff;
    border-radius: 8px;
    font-size: 9px;
    font-weight: bold;
    min-width: 14px;
    min-height: 14px;
    padding: 0 2px;
}}

{p}popover.waydock-menu contents {{
    background-color: {menu_bg};
    border-radius: 10px;
    border: 1px solid {border};
}}

{p}popover.waydock-menu modelbutton,
{p}popover.waydock-menu button.flat {{
    color: #eeeeee;
    border-radius: 6px;
    padding: 6px 10px;
}}

{p}popover.waydock-menu modelbutton:hover,
{p}popover.waydock-menu button.flat:hover,
{p}popover.waydock-menu button.flat.selected {{
    background-color: {accent_soft};
}}
"#,
        p = p,
        bg = bg,
        radius = a.corner_radius,
        bwidth = a.border.width,
        border = border,
        padding = a.padding,
        shadow = shadow,
        item_radius = (a.corner_radius as i32 - 4).max(4),
        item_pad = item_pad,
        icon = a.icon_size + 8,
        transition = transition,
        hover_zoom = hover_zoom,
        accent = accent,
        accent_soft = accent_soft,
        accent_dim = rgba(&a.accent, 0.45),
        ind_h = ind_h,
        ind_w = ind_w,
        ind_radius = ind_radius,
        menu_bg = rgba(&a.background, (a.opacity + 0.2).min(1.0)),
    )
}

pub fn build_css(cfg: &Config) -> String {
    let mut css = String::from(
        r#"
window.waydock,
window.waydock-sensor,
window.waydock-hotspot {
    background: transparent;
}

window.waydock-sensor box,
window.waydock-hotspot box {
    background-color: rgba(0, 0, 0, 0.004);
}

/* utan "to" animeras tillbaka till regelns egen bakgrund (accenten) */
@keyframes waydock-pulse {
    from { background-color: transparent; }
}
"#,
    );
    css += &css_body(cfg, "");
    // skärmar med överridar får egna, mer specifika block
    for name in cfg.outputs.keys() {
        let eff = cfg.for_output(name);
        css += &css_body(&eff, &format!("window.{} ", output_class(name)));
    }
    css
}

/// Ladda (eller byt ut) den globala CSS-providern.
pub fn apply(cfg: &Config, previous: Option<&gtk::CssProvider>) -> gtk::CssProvider {
    let display = gdk::Display::default().expect("ingen display");
    if let Some(old) = previous {
        gtk::style_context_remove_provider_for_display(&display, old);
    }
    let provider = gtk::CssProvider::new();
    provider.load_from_string(&build_css(cfg));
    gtk::style_context_add_provider_for_display(
        &display,
        &provider,
        gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
    );
    provider
}