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

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

pub struct ViewPanel<'a> {
    pub model: &'a Model,
    pub mode: &'a AppMode,
    pub cursor: usize,
}

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

impl<'a> Widget for ViewPanel<'a> {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let is_active = matches!(self.mode, AppMode::ViewPanel);
        let border_style = if is_active {
            Style::default().fg(Color::Blue)
        } else {
            Style::default().fg(Color::DarkGray)
        };

        let block = Block::default()
            .borders(Borders::ALL)
            .border_style(border_style)
            .title(" Views [Enter] switch [n]ew [d]elete ");
        let inner = block.inner(area);
        block.render(area, buf);

        let view_names: Vec<&str> = self.model.views.keys().map(|s| s.as_str()).collect();
        let active = &self.model.active_view;

        for (i, view_name) in view_names.iter().enumerate() {
            if inner.y + i as u16 >= inner.y + inner.height {
                break;
            }

            let is_selected = i == self.cursor && is_active;
            let is_active_view = *view_name == active.as_str();

            let style = if is_selected {
                Style::default()
                    .fg(Color::Black)
                    .bg(Color::Blue)
                    .add_modifier(Modifier::BOLD)
            } else if is_active_view {
                Style::default()
                    .fg(Color::Blue)
                    .add_modifier(Modifier::BOLD)
            } else {
                Style::default()
            };

            let prefix = if is_active_view { "▶ " } else { "  " };
            buf.set_string(
                inner.x,
                inner.y + i as u16,
                format!("{prefix}{view_name}"),
                style,
            );
        }
    }
}