//! Title bar — Photoshop-style unified bar with menus, doc info, and window controls.
//!
//! Combines the menu bar and title bar into a single 28px bar:
//! [HCIE logo] [menu items...] [doc info] [min/max/close]
//! The entire bar is draggable for window movement.

use crate::app::Message;
use crate::theme::ThemeColors;
use iced::widget::{button, container, mouse_area, row, text};
use iced::{Element, Length};

/// All menu definitions for the menu bar.
const MENU_LABELS: &[&str] = &["File", "Edit", "Tools", "Image", "Layer", "Filter", "Select", "View", "Window", "Help"];

/// Build the unified title/menu bar element.
///
/// Layout: [HCIE] [File Edit Tools ... Help] [doc info] [─ □ ×]
/// The left portion (before window controls) is draggable.
pub fn view<'a>(
    doc_name: &'a str,
    zoom: f32,
    canvas_w: u32,
    canvas_h: u32,
    colors: ThemeColors,
    active_menu: Option<usize>,
) -> Element<'a, Message> {
    // ── App name (fixed width) ──
    let app_name = text("HCIE")
        .size(13)
        .font(iced::Font::MONOSPACE)
        .style(move |_theme: &iced::Theme| iced::widget::text::Style {
            color: Some(colors.accent),
        });

    // ── Menu items with hover states ──
    let mut menu_items = row![].spacing(0);
    for (idx, &label) in MENU_LABELS.iter().enumerate() {
        let is_open = active_menu == Some(idx);
        let c = colors;
        let btn = button(text(label).size(11))
            .on_press(Message::MenuOpen(idx))
            .padding([4, 8])
            .style(move |_theme: &iced::Theme, status: iced::widget::button::Status| {
                if is_open {
                    iced::widget::button::Style {
                        background: Some(iced::Background::Color(c.bg_hover)),
                        text_color: c.text_primary,
                        border: iced::Border::default().color(c.border_high).width(1),
                        ..Default::default()
                    }
                } else {
                    match status {
                        iced::widget::button::Status::Hovered => iced::widget::button::Style {
                            background: Some(iced::Background::Color(c.bg_hover)),
                            text_color: c.text_primary,
                            border: iced::Border::default(),
                            ..Default::default()
                        },
                        _ => iced::widget::button::Style {
                            background: Some(iced::Background::Color(iced::Color::from_rgba(0.0, 0.0, 0.0, 0.0))),
                            text_color: c.text_primary,
                            border: iced::Border::default(),
                            ..Default::default()
                        },
                    }
                }
            });
        menu_items = menu_items.push(btn);
    }

    // ── Document info ──
    let doc_info = text(format!("{} — {}×{} @ {:.0}%", doc_name, canvas_w, canvas_h, zoom * 100.0))
        .size(10)
        .style(move |_theme: &iced::Theme| iced::widget::text::Style {
            color: Some(colors.text_secondary),
        });

    // ── Window controls (right side) with hover states ──
    let c = colors;

    let minimize_btn = button(text("─").size(10))
        .on_press(Message::WindowMinimize)
        .padding([4, 8])
        .style(move |_theme: &iced::Theme, status: iced::widget::button::Status| {
            match status {
                iced::widget::button::Status::Hovered => iced::widget::button::Style {
                    background: Some(iced::Background::Color(c.bg_hover)),
                    text_color: c.text_primary,
                    border: iced::Border::default(),
                    ..Default::default()
                },
                _ => iced::widget::button::Style {
                    background: Some(iced::Background::Color(iced::Color::from_rgba(0.0, 0.0, 0.0, 0.0))),
                    text_color: c.text_secondary,
                    border: iced::Border::default(),
                    ..Default::default()
                },
            }
        });

    let maximize_btn = button(text("□").size(10))
        .on_press(Message::WindowMaximize)
        .padding([4, 8])
        .style(move |_theme: &iced::Theme, status: iced::widget::button::Status| {
            match status {
                iced::widget::button::Status::Hovered => iced::widget::button::Style {
                    background: Some(iced::Background::Color(c.bg_hover)),
                    text_color: c.text_primary,
                    border: iced::Border::default(),
                    ..Default::default()
                },
                _ => iced::widget::button::Style {
                    background: Some(iced::Background::Color(iced::Color::from_rgba(0.0, 0.0, 0.0, 0.0))),
                    text_color: c.text_secondary,
                    border: iced::Border::default(),
                    ..Default::default()
                },
            }
        });

    let close_btn = button(text("×").size(11))
        .on_press(Message::WindowClose)
        .padding([4, 10])
        .style(move |_theme: &iced::Theme, status: iced::widget::button::Status| {
            match status {
                iced::widget::button::Status::Hovered => iced::widget::button::Style {
                    background: Some(iced::Background::Color(c.danger)),
                    text_color: iced::Color::WHITE,
                    border: iced::Border::default(),
                    ..Default::default()
                },
                _ => iced::widget::button::Style {
                    background: Some(iced::Background::Color(iced::Color::from_rgba(0.0, 0.0, 0.0, 0.0))),
                    text_color: c.text_secondary,
                    border: iced::Border::default(),
                    ..Default::default()
                },
            }
        });

    let window_controls = row![minimize_btn, maximize_btn, close_btn].spacing(0);

    // ── Left side (draggable): app name + menus + doc info ──
    let left_side = row![
        app_name,
        text("  ").size(11),
        menu_items,
        iced::widget::Space::with_width(Length::Fill),
        doc_info,
    ]
    .spacing(0)
    .align_y(iced::Alignment::Center);

    let draggable_left = mouse_area(
        container(left_side)
            .width(Length::Fill)
            .height(28)
            .align_y(iced::Alignment::Center)
            .padding([0, 8])
    )
    .on_press(Message::WindowDrag)
    .interaction(iced::mouse::Interaction::Grab);

    // ── Full bar ──
    let bar = row![
        draggable_left,
        window_controls,
    ]
    .align_y(iced::Alignment::Center);

    container(bar)
        .width(Length::Fill)
        .height(28)
        .style(move |_theme| iced::widget::container::Style {
            background: Some(iced::Background::Color(colors.bg_app)),
            border: iced::Border::default().color(colors.border_low).width(1),
            ..Default::default()
        })
        .into()
}