//! Plot Style Table Editor window — fills the entire OS window.

use crate::app::Message;
use iced::widget::{button, column, container, row, scrollable, text, text_input, Space};
use iced::{Background, Border, Color, Element, Fill, Theme};

const TB:     Color = Color { r: 0.13, g: 0.13, b: 0.13, a: 1.0 };
const BG:     Color = Color { r: 0.15, g: 0.15, b: 0.15, a: 1.0 };
const BORDER: Color = Color { r: 0.35, g: 0.35, b: 0.35, a: 1.0 };
const TEXT:   Color = Color { r: 0.88, g: 0.88, b: 0.88, a: 1.0 };
const DIM:    Color = Color { r: 0.55, g: 0.55, b: 0.55, a: 1.0 };
const ACCENT: Color = Color { r: 0.25, g: 0.50, b: 0.85, a: 1.0 };
const ACTIVE: Color = Color { r: 0.20, g: 0.40, b: 0.70, a: 1.0 };
const FIELD:  Color = Color { r: 0.10, g: 0.10, b: 0.10, a: 1.0 };
const LIST:   Color = Color { r: 0.12, g: 0.12, b: 0.12, a: 1.0 };

fn btn_s(accent: bool) -> impl Fn(&Theme, button::Status) -> button::Style {
    move |_: &Theme, st| button::Style {
        background: Some(Background::Color(match (accent, st) {
            (true,  button::Status::Hovered | button::Status::Pressed) => Color { r: 0.20, g: 0.42, b: 0.72, a: 1.0 },
            (false, button::Status::Hovered | button::Status::Pressed) => Color { r: 0.28, g: 0.28, b: 0.28, a: 1.0 },
            (true,  _) => ACCENT,
            _ => Color { r: 0.22, g: 0.22, b: 0.22, a: 1.0 },
        })),
        text_color: TEXT,
        border: Border { color: BORDER, width: 1.0, radius: 4.0.into() },
        ..Default::default()
    }
}

fn field_style(_: &Theme, _: text_input::Status) -> text_input::Style {
    text_input::Style {
        background: Background::Color(FIELD),
        border: Border { color: BORDER, width: 1.0, radius: 3.0.into() },
        icon: TEXT, placeholder: DIM, value: TEXT, selection: ACCENT,
    }
}

fn hdivider<'a>() -> Element<'a, Message> {
    container(Space::new().width(Fill).height(1))
        .width(Fill).height(1)
        .style(|_: &Theme| container::Style {
            background: Some(Background::Color(BORDER)),
            ..Default::default()
        })
        .into()
}

fn vsep<'a>() -> Element<'a, Message> {
    container(Space::new().width(1).height(Fill))
        .width(1).height(Fill)
        .style(|_: &Theme| container::Style {
            background: Some(Background::Color(BORDER)),
            ..Default::default()
        })
        .into()
}

pub fn view_window<'a>(
    table: Option<&'a crate::io::plot_style::PlotStyleTable>,
    selected_aci: u8,
    color_buf: &'a str,
    lw_buf: &'a str,
    screen_buf: &'a str,
) -> Element<'a, Message> {
    let table_name = table.map(|t| t.name.as_str()).unwrap_or("(no table loaded)");

    // ── Toolbar ───────────────────────────────────────────────────────────
    let toolbar = container(
        row![
            button(text("Load CTB/STB").size(11)).on_press(Message::PlotStyleLoad).style(btn_s(false)).padding([4, 10]),
            button(text("Save As…").size(11)).on_press(Message::PlotStylePanelSave).style(btn_s(false)).padding([4, 10]),
            button(text("Clear Table").size(11)).on_press(Message::PlotStyleClear).style(btn_s(false)).padding([4, 10]),
            Space::new().width(Fill),
            text(table_name).size(10).color(DIM),
        ]
        .spacing(4)
        .align_y(iced::Center)
    )
    .style(|_: &Theme| container::Style {
        background: Some(Background::Color(TB)),
        ..Default::default()
    })
    .width(Fill)
    .padding([5, 8]);

    // ── Left: ACI list ────────────────────────────────────────────────────
    let aci_items: Vec<Element<'_, Message>> = (1u8..=255).map(|aci| {
        let is_sel = aci == selected_aci;
        let has_override = table.and_then(|t| t.aci_entries.get(aci as usize))
            .map(|e| e.color.is_some() || e.lineweight != 255 || e.screening != 100)
            .unwrap_or(false);
        let lw_str = table.and_then(|t| t.aci_entries.get(aci as usize))
            .and_then(|e| {
                if e.lineweight != 255 {
                    crate::io::plot_style::LW_TABLE.get(e.lineweight as usize)
                        .map(|lw| format!("{lw:.2}mm"))
                } else { None }
            }).unwrap_or_default();
        let color_str = table.and_then(|t| t.aci_entries.get(aci as usize))
            .and_then(|e| e.color.map(|[r, g, b]| format!("#{r:02X}{g:02X}{b:02X}")))
            .unwrap_or_default();
        let label = if has_override {
            format!("{aci:>3}  {color_str:<9} {lw_str}")
        } else {
            format!("{aci:>3}  (default)")
        };
        button(text(label).size(10).font(iced::Font::MONOSPACE))
            .on_press(Message::PlotStylePanelSelectAci(aci))
            .style(move |_: &Theme, st| button::Style {
                background: Some(Background::Color(match (is_sel, st) {
                    (true,  _) => ACTIVE,
                    (false, button::Status::Hovered | button::Status::Pressed) => Color { r: 0.26, g: 0.26, b: 0.26, a: 1.0 },
                    _ => Color::TRANSPARENT,
                })),
                text_color: TEXT,
                ..Default::default()
            })
            .padding([2, 8])
            .width(Fill)
            .into()
    }).collect();

    let aci_list = container(
        column![
            text("ACI Color Index").size(10).color(DIM),
            container(
                scrollable(column(aci_items).spacing(1)).height(Fill)
            )
            .style(|_: &Theme| container::Style {
                background: Some(Background::Color(LIST)),
                border: Border { color: BORDER, width: 1.0, radius: 3.0.into() },
                ..Default::default()
            })
            .width(Fill)
            .height(Fill)
            .padding(2),
        ]
        .spacing(4)
        .height(Fill)
    )
    .width(280)
    .height(Fill)
    .padding(iced::Padding { top: 12.0, right: 8.0, bottom: 12.0, left: 12.0 });

    // ── Right: Edit panel ─────────────────────────────────────────────────
    let entry = table.and_then(|t| t.aci_entries.get(selected_aci as usize));
    let cur_color = entry.and_then(|e| e.color.map(|[r,g,b]| format!("#{r:02X}{g:02X}{b:02X}"))).unwrap_or_else(|| "(none)".into());
    let cur_lw = entry.map(|e| if e.lineweight == 255 { "object".into() } else {
        crate::io::plot_style::LW_TABLE.get(e.lineweight as usize)
            .map(|lw| format!("{lw:.2}mm (idx {})", e.lineweight))
            .unwrap_or_else(|| format!("idx {}", e.lineweight))
    }).unwrap_or_else(|| "—".into());
    let cur_scr = entry.map(|e| format!("{}%", e.screening)).unwrap_or_else(|| "—".into());

    let lbl = |s: &'static str| text(s).size(11).color(DIM);

    let edit_panel = container(
        column![
            row![
                text("ACI:").size(11).color(DIM).width(100),
                text(format!("{selected_aci}")).size(11),
            ].spacing(8).align_y(iced::Center),
            lbl("Color override (#RRGGBB):"),
            text_input("#RRGGBB or blank", color_buf)
                .on_input(Message::PlotStylePanelColorBuf)
                .style(field_style).size(11).padding([4, 8]),
            lbl("Lineweight index (0-24, 255=obj):"),
            text_input("255", lw_buf)
                .on_input(Message::PlotStylePanelLwBuf)
                .style(field_style).size(11).padding([4, 8]),
            lbl("Screening (0-100):"),
            text_input("100", screen_buf)
                .on_input(Message::PlotStylePanelScreenBuf)
                .style(field_style).size(11).padding([4, 8]),
            Space::new().height(8),
            text("Current values:").size(10).color(DIM),
            text(format!("  Color: {cur_color}")).size(10),
            text(format!("  Lineweight: {cur_lw}")).size(10),
            text(format!("  Screening: {cur_scr}")).size(10),
            Space::new().height(Fill),
            button(text("Apply to ACI").size(11))
                .on_press(Message::PlotStylePanelApply)
                .style(btn_s(true))
                .padding([5, 10]),
        ]
        .spacing(8)
        .height(Fill)
    )
    .width(Fill)
    .height(Fill)
    .padding([12, 12]);

    let body = row![aci_list, vsep(), edit_panel].height(Fill);

    container(
        column![toolbar, hdivider(), body].spacing(0)
    )
    .style(|_: &Theme| container::Style {
        background: Some(Background::Color(BG)),
        ..Default::default()
    })
    .width(Fill)
    .height(Fill)
    .into()
}