use ratatui::{
    buffer::Buffer,
    layout::Rect,
    style::{Color, Modifier, Style},
    widgets::Widget,
};

use crate::model::Model;
use crate::view::Axis;
use crate::ui::app::AppMode;

pub struct TileBar<'a> {
    pub model: &'a Model,
    pub mode: &'a AppMode,
}

impl<'a> TileBar<'a> {
    pub fn new(model: &'a Model, mode: &'a AppMode) -> Self {
        Self { model, mode }
    }
}

impl<'a> Widget for TileBar<'a> {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let view = match self.model.active_view() {
            Some(v) => v,
            None => return,
        };

        let selected_cat_idx = if let AppMode::TileSelect { cat_idx } = self.mode {
            Some(*cat_idx)
        } else {
            None
        };

        let mut x = area.x + 1;
        buf.set_string(area.x, area.y, " Tiles: ", Style::default().fg(Color::Gray));
        x += 8;

        let cat_names: Vec<&str> = self.model.category_names();
        for (i, cat_name) in cat_names.iter().enumerate() {
            let axis = view.axis_of(cat_name);
            let axis_symbol = match axis {
                Axis::Row => "↕",
                Axis::Column => "↔",
                Axis::Page => "☰",
                Axis::Unassigned => "─",
            };

            let label = format!(" [{cat_name} {axis_symbol}] ");
            let is_selected = selected_cat_idx == Some(i);

            let style = if is_selected {
                Style::default().fg(Color::Black).bg(Color::Cyan).add_modifier(Modifier::BOLD)
            } else {
                match axis {
                    Axis::Row => Style::default().fg(Color::Green),
                    Axis::Column => Style::default().fg(Color::Blue),
                    Axis::Page => Style::default().fg(Color::Magenta),
                    Axis::Unassigned => Style::default().fg(Color::DarkGray),
                }
            };

            if x + label.len() as u16 > area.x + area.width { break; }
            buf.set_string(x, area.y, &label, style);
            x += label.len() as u16;
        }

        // Hint
        if matches!(self.mode, AppMode::TileSelect { .. }) {
            let hint = " [Enter] cycle axis  [r/c/p] set axis  [←→] select  [Esc] cancel";
            if x + hint.len() as u16 <= area.x + area.width {
                buf.set_string(x, area.y, hint, Style::default().fg(Color::DarkGray));
            }
        } else {
            let hint = " Ctrl+↑↓←→ to move tiles";
            if x + hint.len() as u16 <= area.x + area.width {
                buf.set_string(x, area.y, hint, Style::default().fg(Color::DarkGray));
            }
        }
    }
}