//! Pinned messages viewer modal

use crate::app::App;
use crate::tdlib::TdClientTrait;
use crate::ui::components::{calculate_scroll_offset, render_help_bar, render_message_item};
use ratatui::{
    layout::{Constraint, Direction, Layout, Rect},
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph},
    Frame,
};

/// Renders pinned messages mode
pub fn render<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>) {
    // Извлекаем данные из ChatState
    let (messages, selected_index) =
        if let crate::app::ChatState::PinnedMessages { messages, selected_index } = &app.chat_state
        {
            (messages.as_slice(), *selected_index)
        } else {
            return; // Некорректное состояние
        };

    let chunks = Layout::default()
        .direction(Direction::Vertical)
        .constraints([
            Constraint::Length(3), // Header
            Constraint::Min(0),    // Pinned messages list
            Constraint::Length(3), // Help bar
        ])
        .split(area);

    // Header
    let total = messages.len();
    let current = selected_index + 1;
    let header_text = format!("📌 ЗАКРЕПЛЁННЫЕ ({}/{})", current, total);
    let header = Paragraph::new(header_text)
        .block(
            Block::default()
                .borders(Borders::ALL)
                .border_style(Style::default().fg(Color::Magenta)),
        )
        .style(
            Style::default()
                .fg(Color::Magenta)
                .add_modifier(Modifier::BOLD),
        );
    f.render_widget(header, chunks[0]);

    // Pinned messages list
    let content_width = chunks[1].width.saturating_sub(2) as usize;
    let mut lines: Vec<Line> = Vec::new();

    for (idx, msg) in messages.iter().enumerate() {
        if idx > 0 {
            lines.push(Line::from(""));
        }
        lines.extend(render_message_item(
            msg,
            idx == selected_index,
            content_width,
            3,
        ));
    }

    if lines.is_empty() {
        lines.push(Line::from(Span::styled(
            "Нет закреплённых сообщений",
            Style::default().fg(Color::Gray),
        )));
    }

    // Скролл к выбранному сообщению
    let scroll_offset = calculate_scroll_offset(selected_index, 5, chunks[1].height);

    let messages_widget = Paragraph::new(lines)
        .block(
            Block::default()
                .borders(Borders::ALL)
                .border_style(Style::default().fg(Color::Magenta)),
        )
        .scroll((scroll_offset, 0));
    f.render_widget(messages_widget, chunks[1]);

    // Help bar
    let help = render_help_bar(
        &[
            ("↑↓", "навигация", Color::Yellow),
            ("Enter", "перейти", Color::Green),
            ("Esc", "выход", Color::Red),
        ],
        Color::Magenta,
    );
    f.render_widget(help, chunks[2]);
}