//! Shared message list rendering for search and pinned modals

use crate::tdlib::MessageInfo;
use ratatui::{
    layout::Alignment,
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph},
};

/// Renders a single message item with marker, sender, date, and wrapped text
pub fn render_message_item(
    msg: &MessageInfo,
    is_selected: bool,
    content_width: usize,
    max_preview_lines: usize,
) -> Vec<Line<'static>> {
    let mut lines = Vec::new();

    // Marker, sender name, and date
    let marker = if is_selected { "▶ " } else { "  " };
    let sender_color = if msg.is_outgoing() {
        Color::Green
    } else {
        Color::Cyan
    };
    let sender_name = if msg.is_outgoing() {
        "Вы".to_string()
    } else {
        msg.sender_name().to_string()
    };

    lines.push(Line::from(vec![
        Span::styled(
            marker.to_string(),
            Style::default()
                .fg(Color::Yellow)
                .add_modifier(Modifier::BOLD),
        ),
        Span::styled(
            format!("{} ", sender_name),
            Style::default()
                .fg(sender_color)
                .add_modifier(Modifier::BOLD),
        ),
        Span::styled(
            format!("({})", crate::utils::format_datetime(msg.date())),
            Style::default().fg(Color::Gray),
        ),
    ]));

    // Wrapped message text
    let msg_color = if is_selected {
        Color::Yellow
    } else {
        Color::White
    };
    let max_width = content_width.saturating_sub(4);
    let wrapped = crate::ui::messages::wrap_text_with_offsets(msg.text(), max_width);
    let wrapped_count = wrapped.len();

    for wrapped_line in wrapped.into_iter().take(max_preview_lines) {
        lines.push(Line::from(vec![
            Span::raw("    ".to_string()),
            Span::styled(wrapped_line.text, Style::default().fg(msg_color)),
        ]));
    }
    if wrapped_count > max_preview_lines {
        lines.push(Line::from(vec![
            Span::raw("    ".to_string()),
            Span::styled("...".to_string(), Style::default().fg(Color::Gray)),
        ]));
    }

    lines
}

/// Calculates scroll offset to keep selected item visible
pub fn calculate_scroll_offset(
    selected_index: usize,
    lines_per_item: usize,
    visible_height: u16,
) -> u16 {
    let visible = visible_height.saturating_sub(2) as usize;
    let selected_line = selected_index * lines_per_item;
    if selected_line > visible / 2 {
        (selected_line - visible / 2) as u16
    } else {
        0
    }
}

/// Renders a help bar with keyboard shortcuts
pub fn render_help_bar(shortcuts: &[(&str, &str, Color)], border_color: Color) -> Paragraph<'static> {
    let mut spans: Vec<Span<'static>> = Vec::new();
    for (i, (key, label, color)) in shortcuts.iter().enumerate() {
        if i > 0 {
            spans.push(Span::raw("  ".to_string()));
        }
        spans.push(Span::styled(
            format!(" {} ", key),
            Style::default()
                .fg(*color)
                .add_modifier(Modifier::BOLD),
        ));
        spans.push(Span::raw(label.to_string()));
    }

    Paragraph::new(Line::from(spans))
        .block(
            Block::default()
                .borders(Borders::ALL)
                .border_style(Style::default().fg(border_color)),
        )
        .alignment(Alignment::Center)
}