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use std::cmp::Ordering;
use termion::event::{Event, Key};
use crate::config::AppKeyMapping;
use crate::context::AppContext;
use crate::error::JoshutoResult;
use crate::event::process_event;
use crate::event::AppEvent;
use crate::key_command::{Command, CommandKeybind};
use crate::ui::widgets;
use crate::ui::widgets::TuiHelp;
use crate::ui::AppBackend;
pub fn help_loop(
context: &mut AppContext,
backend: &mut AppBackend,
keymap_t: &AppKeyMapping,
) -> JoshutoResult {
context.flush_event();
let mut offset = 0;
let mut search_query = String::new();
let mut sort_by = 1;
loop {
let keymap = if search_query.is_empty() {
widgets::get_keymap_table(&keymap_t.default_view, &search_query, sort_by)
} else {
widgets::get_keymap_table(&keymap_t.default_view, &search_query[1..], sort_by)
};
context.remove_external_preview();
backend.render(TuiHelp::new(&keymap, &mut offset, &search_query));
let event = match context.poll_event() {
Ok(event) => event,
Err(_) => return Ok(()),
};
match event {
AppEvent::Termion(event) => {
if search_query.is_empty() {
match event {
Event::Key(Key::Esc) => break,
Event::Key(Key::Char('1')) => sort_by = 0,
Event::Key(Key::Char('2')) => sort_by = 1,
Event::Key(Key::Char('3')) => sort_by = 2,
Event::Key(Key::Char('/')) => search_query.push('/'),
event => {
if let Some(CommandKeybind::SimpleKeybind { command, .. }) =
keymap_t.help_view.get(&event)
{
match command {
Command::CursorMoveUp { .. } => move_offset(&mut offset, -1),
Command::CursorMoveDown { .. } => move_offset(&mut offset, 1),
Command::CursorMoveHome => offset = 0,
Command::CursorMoveEnd => offset = 255,
Command::CursorMovePageUp(_) => move_offset(&mut offset, -10),
Command::CursorMovePageDown(_) => move_offset(&mut offset, 10),
Command::CloseTab | Command::Help => break,
_ => (),
}
}
}
}
} else {
match event {
Event::Key(Key::Esc) => search_query.clear(),
Event::Key(Key::Backspace) => {
search_query.pop();
}
Event::Key(Key::Char(chr)) => search_query.push(chr),
_ => (),
}
}
context.flush_event();
}
_ => process_event::process_noninteractive(event, context),
}
}
Ok(())
}
// offset is a u8, so if we make it negative program will fail.
// This function prevents this error
fn move_offset(offset: &mut u8, moving_amount: i8) {
match moving_amount.cmp(&0) {
Ordering::Greater => {
*offset += moving_amount as u8;
}
Ordering::Less => {
if *offset > -moving_amount as u8 {
*offset -= -moving_amount as u8;
} else {
*offset = 0;
}
}
Ordering::Equal => (),
}
}
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