//! Compose bar / input box rendering

use crate::app::App;
use crate::app::InputMode;
use crate::app::methods::{compose::ComposeMethods, messages::MessageMethods};
use crate::tdlib::TdClientTrait;
use crate::ui::components;
use ratatui::{
    layout::Rect,
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph},
    Frame,
};

/// Renders input field with cursor at the specified position
fn render_input_with_cursor(
    prefix: &str,
    text: &str,
    cursor_pos: usize,
    color: Color,
) -> Line<'static> {
    components::render_input_field(prefix, text, cursor_pos, color)
}

/// Renders input box with support for different modes (forward/select/edit/reply/normal)
pub fn render<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>) {
    let (input_line, input_title): (Line, &str) = if app.is_forwarding() {
        // Режим пересылки - показываем превью сообщения
        let forward_preview = app
            .get_forwarding_message()
            .map(|m| {
                let text_preview: String = m.text().chars().take(40).collect();
                let ellipsis = if m.text().chars().count() > 40 {
                    "..."
                } else {
                    ""
                };
                format!("↪ {}{}", text_preview, ellipsis)
            })
            .unwrap_or_else(|| "↪ ...".to_string());

        let line = Line::from(Span::styled(forward_preview, Style::default().fg(Color::Cyan)));
        (line, " Выберите чат ← ")
    } else if app.is_selecting_message() {
        // Режим выбора сообщения - подсказка зависит от возможностей
        let selected_msg = app.get_selected_message();
        let can_edit = selected_msg
            .as_ref()
            .map(|m| m.can_be_edited() && m.is_outgoing())
            .unwrap_or(false);
        let can_delete = selected_msg
            .as_ref()
            .map(|m| m.can_be_deleted_only_for_self() || m.can_be_deleted_for_all_users())
            .unwrap_or(false);

        let hint = match (can_edit, can_delete) {
            (true, true) => "↑↓ · Enter ред. · r ответ · f перслть · y копир. · d удал. · Esc",
            (true, false) => "↑↓ · Enter ред. · r ответ · f переслть · y копир. · Esc",
            (false, true) => "↑↓ · r ответ · f переслать · y копир. · d удалить · Esc",
            (false, false) => "↑↓ · r ответить · f переслать · y копировать · Esc",
        };
        (
            Line::from(Span::styled(hint, Style::default().fg(Color::Cyan))),
            " Выбор сообщения ",
        )
    } else if app.is_editing() {
        // Режим редактирования
        if app.message_input.is_empty() {
            let line = Line::from(vec![
                Span::raw("✏ "),
                Span::styled("█", Style::default().fg(Color::Magenta)),
                Span::styled(" Введите новый текст...", Style::default().fg(Color::Gray)),
            ]);
            (line, " Редактирование (Esc отмена) ")
        } else {
            let line = render_input_with_cursor(
                "✏ ",
                &app.message_input,
                app.cursor_position,
                Color::Magenta,
            );
            (line, " Редактирование (Esc отмена) ")
        }
    } else if app.is_replying() {
        // Режим ответа на сообщение
        let reply_preview = app
            .get_replying_to_message()
            .map(|m| {
                let sender = if m.is_outgoing() {
                    "Вы"
                } else {
                    m.sender_name()
                };
                let text_preview: String = m.text().chars().take(30).collect();
                let ellipsis = if m.text().chars().count() > 30 {
                    "..."
                } else {
                    ""
                };
                format!("{}: {}{}", sender, text_preview, ellipsis)
            })
            .unwrap_or_else(|| "...".to_string());

        if app.message_input.is_empty() {
            let line = Line::from(vec![
                Span::styled("↪ ", Style::default().fg(Color::Cyan)),
                Span::styled(reply_preview, Style::default().fg(Color::Gray)),
                Span::raw(" "),
                Span::styled("█", Style::default().fg(Color::Yellow)),
            ]);
            (line, " Ответ (Esc отмена) ")
        } else {
            let short_preview: String = reply_preview.chars().take(15).collect();
            let prefix = format!("↪ {} > ", short_preview);
            let line = render_input_with_cursor(
                &prefix,
                &app.message_input,
                app.cursor_position,
                Color::Yellow,
            );
            (line, " Ответ (Esc отмена) ")
        }
    } else if app.input_mode == InputMode::Normal {
        // Normal mode — dim, no cursor
        if app.message_input.is_empty() {
            let line = Line::from(vec![
                Span::styled("> Press i to type...", Style::default().fg(Color::DarkGray)),
            ]);
            (line, "")
        } else {
            let draft_preview: String = app.message_input.chars().take(60).collect();
            let ellipsis = if app.message_input.chars().count() > 60 { "..." } else { "" };
            let line = Line::from(Span::styled(
                format!("> {}{}", draft_preview, ellipsis),
                Style::default().fg(Color::DarkGray),
            ));
            (line, "")
        }
    } else {
        // Insert mode — active, with cursor
        if app.message_input.is_empty() {
            let line = Line::from(vec![
                Span::raw("> "),
                Span::styled("█", Style::default().fg(Color::Yellow)),
                Span::styled(" Введите сообщение...", Style::default().fg(Color::Gray)),
            ]);
            (line, "")
        } else {
            let line = render_input_with_cursor(
                "> ",
                &app.message_input,
                app.cursor_position,
                Color::Yellow,
            );
            (line, "")
        }
    };

    let input_block = if input_title.is_empty() {
        let border_style = if app.input_mode == InputMode::Insert {
            Style::default().fg(Color::Green)
        } else {
            Style::default().fg(Color::DarkGray)
        };
        Block::default().borders(Borders::ALL).border_style(border_style)
    } else {
        let title_color = if app.is_replying() || app.is_forwarding() {
            Color::Cyan
        } else {
            Color::Magenta
        };
        Block::default()
            .borders(Borders::ALL)
            .title(input_title)
            .title_style(
                Style::default()
                    .fg(title_color)
                    .add_modifier(Modifier::BOLD),
            )
    };

    let input = Paragraph::new(input_line)
        .block(input_block)
        .wrap(ratatui::widgets::Wrap { trim: false });
    f.render_widget(input, area);
}