//! Chat list panel: search box, chat items, and user online status.

use crate::app::App;
use crate::app::methods::{compose::ComposeMethods, search::SearchMethods};
use crate::tdlib::TdClientTrait;
use crate::tdlib::UserOnlineStatus;
use crate::ui::components;
use ratatui::{
    layout::{Constraint, Direction, Layout, Rect},
    style::{Color, Modifier, Style},
    widgets::{Block, Borders, List, ListItem, Paragraph},
    Frame,
};

pub fn render<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &mut App<T>) {
    let chat_chunks = Layout::default()
        .direction(Direction::Vertical)
        .constraints([
            Constraint::Length(3), // Search box
            Constraint::Min(0),    // Chat list
            Constraint::Length(3), // User status
        ])
        .split(area);

    // Search box
    let search_text = if app.is_searching {
        if app.search_query.is_empty() {
            "🔍 Введите для поиска...".to_string()
        } else {
            format!("🔍 {}", app.search_query)
        }
    } else {
        "🔍 Ctrl+S для поиска".to_string()
    };
    let search_style = if app.is_searching {
        Style::default().fg(Color::Yellow)
    } else {
        Style::default().fg(Color::DarkGray)
    };
    let search = Paragraph::new(search_text)
        .block(Block::default().borders(Borders::ALL))
        .style(search_style);
    f.render_widget(search, chat_chunks[0]);

    // Chat list (filtered if searching)
    let filtered_chats = app.get_filtered_chats();
    let items: Vec<ListItem> = filtered_chats
        .iter()
        .map(|chat| {
            let is_selected = app.selected_chat_id == Some(chat.id);
            let user_status = app.td_client.get_user_status_by_chat_id(chat.id);
            components::render_chat_list_item(chat, is_selected, user_status)
        })
        .collect();

    // Заголовок блока: обычный или режим пересылки
    let block = if app.is_forwarding() {
        Block::default()
            .title(" ↪ Выберите чат ")
            .borders(Borders::ALL)
            .border_style(Style::default().fg(Color::Cyan))
    } else {
        Block::default().borders(Borders::ALL)
    };

    let chats_list = List::new(items).block(block).highlight_style(
        Style::default()
            .add_modifier(Modifier::ITALIC)
            .fg(Color::Yellow),
    );

    f.render_stateful_widget(chats_list, chat_chunks[1], &mut app.chat_list_state);

    // User status - показываем статус выбранного или выделенного чата
    let status_chat_id = if app.selected_chat_id.is_some() {
        app.selected_chat_id
    } else {
        let filtered = app.get_filtered_chats();
        app.chat_list_state.selected().and_then(|i| filtered.get(i).map(|c| c.id))
    };
    let (status_text, status_color) = match status_chat_id {
        Some(chat_id) => format_user_status(app.td_client.get_user_status_by_chat_id(chat_id)),
        None => ("".to_string(), Color::DarkGray),
    };

    let status = Paragraph::new(status_text)
        .block(Block::default().borders(Borders::ALL))
        .style(Style::default().fg(status_color));
    f.render_widget(status, chat_chunks[2]);
}

/// Форматирует статус пользователя для отображения в статус-баре
fn format_user_status(status: Option<&UserOnlineStatus>) -> (String, Color) {
    match status {
        Some(UserOnlineStatus::Online) => ("● онлайн".to_string(), Color::Green),
        Some(UserOnlineStatus::Recently) => ("был(а) недавно".to_string(), Color::Yellow),
        Some(UserOnlineStatus::Offline(was_online)) => {
            (crate::utils::format_was_online(*was_online), Color::Gray)
        }
        Some(UserOnlineStatus::LastWeek) => ("был(а) на этой неделе".to_string(), Color::DarkGray),
        Some(UserOnlineStatus::LastMonth) => ("был(а) в этом месяце".to_string(), Color::DarkGray),
        Some(UserOnlineStatus::LongTimeAgo) => ("был(а) давно".to_string(), Color::DarkGray),
        None => ("".to_string(), Color::DarkGray),
    }
}