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use std::io;
use std::path::Path;
use crossterm::event::{self, Event, KeyCode, KeyEventKind};
use ratatui::{Terminal, backend::CrosstermBackend};
use crate::ast::{Env, Spec, State, Transition, TransitionWithGuards};
use crate::eval::Definitions;
use super::render::{ui, ui_replay};
use super::repl::{eval_repl, test_hypothesis};
use super::state::{ExplorerState, InputMode};
pub(super) struct AppContext<'a> {
pub spec: &'a Spec,
pub env: &'a mut Env,
pub defs: &'a Definitions,
pub initial: &'a State,
pub initial_actions: &'a [Transition],
pub initial_actions_with_guards: &'a [TransitionWithGuards],
}
pub(super) fn run_app(
terminal: &mut Terminal<CrosstermBackend<io::Stdout>>,
explorer: &mut ExplorerState,
ctx: &mut AppContext<'_>,
) -> io::Result<()> {
loop {
terminal.draw(|f| ui(f, explorer, ctx.spec, ctx.env, ctx.defs))?;
if let Event::Key(key) = event::read()? {
if key.kind != KeyEventKind::Press {
continue;
}
explorer.status_message = None;
match explorer.input_mode {
InputMode::Repl => match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.repl_input.clear();
explorer.repl_output = None;
}
KeyCode::Enter => {
let result = eval_repl(
&explorer.repl_input,
&explorer.current,
ctx.spec,
ctx.env,
ctx.defs,
);
explorer.repl_output = Some(result);
explorer.repl_input.clear();
}
KeyCode::Backspace => {
explorer.repl_input.pop();
}
KeyCode::Char(c) => {
explorer.repl_input.push(c);
}
_ => {}
},
InputMode::Trace => match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.trace_input.clear();
explorer.trace_output = None;
}
KeyCode::Enter => {
explorer.input_mode = InputMode::Normal;
}
KeyCode::Backspace => {
explorer.trace_input.pop();
explorer.trace_output = Some(explorer.compute_trace(&explorer.trace_input));
}
KeyCode::Char(c) => {
explorer.trace_input.push(c);
explorer.trace_output = Some(explorer.compute_trace(&explorer.trace_input));
}
_ => {}
},
InputMode::Hypothesis => match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.hypothesis_input.clear();
explorer.hypothesis_output = None;
}
KeyCode::Enter => {
let result = test_hypothesis(
&explorer.hypothesis_input,
&explorer.history,
&explorer.current,
ctx.spec,
ctx.env,
ctx.defs,
);
explorer.hypothesis_output = Some(result);
explorer.hypothesis_input.clear();
}
KeyCode::Backspace => {
explorer.hypothesis_input.pop();
}
KeyCode::Char(c) => {
explorer.hypothesis_input.push(c);
}
_ => {}
},
InputMode::Walk => match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.walk_input.clear();
}
KeyCode::Enter => {
explorer.input_mode = InputMode::Normal;
match explorer.walk_input.trim().parse::<usize>() {
Ok(0) => {
explorer.status_message = Some(("Steps must be > 0".into(), true));
}
Ok(n) => {
explorer.random_walk(n, ctx.spec, ctx.env, ctx.defs);
}
Err(_) => {
explorer.status_message = Some(("Invalid number".into(), true));
}
}
explorer.walk_input.clear();
}
KeyCode::Backspace => {
explorer.walk_input.pop();
}
KeyCode::Char(c) => {
explorer.walk_input.push(c);
}
_ => {}
},
InputMode::StepUntil => match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.step_until_input.clear();
}
KeyCode::Enter => {
explorer.input_mode = InputMode::Normal;
let input = explorer.step_until_input.clone();
explorer.step_until_input.clear();
let (expr_str, max_steps) = match input.rfind(';') {
Some(pos) => {
let after = input[pos + 1..].trim();
match after.parse::<usize>() {
Ok(n) if n > 0 => (&input[..pos], n),
_ => (input.as_str(), 1000),
}
}
None => (input.as_str(), 1000),
};
match crate::parser::parse_expr(expr_str) {
Ok(condition) => {
explorer
.step_until(&condition, max_steps, ctx.spec, ctx.env, ctx.defs);
}
Err(e) => {
explorer.status_message =
Some((format!("Parse error: {}", e.message), true));
}
}
}
KeyCode::Backspace => {
explorer.step_until_input.pop();
}
KeyCode::Char(c) => {
explorer.step_until_input.push(c);
}
_ => {}
},
InputMode::Normal => match key.code {
KeyCode::Char('q') | KeyCode::Esc => return Ok(()),
KeyCode::Down | KeyCode::Char('j') => explorer.select_next(),
KeyCode::Up | KeyCode::Char('k') => explorer.select_prev(),
KeyCode::Right | KeyCode::Char(' ') => explorer.toggle_expand(),
KeyCode::Left => explorer.collapse_selected(),
KeyCode::Enter => explorer.take_action(ctx.spec, ctx.env, ctx.defs),
KeyCode::Char('b') => explorer.backtrack(ctx.spec, ctx.env, ctx.defs),
KeyCode::Char('r') => {
explorer.reset(
ctx.initial.clone(),
ctx.initial_actions.to_vec(),
ctx.initial_actions_with_guards.to_vec(),
);
}
KeyCode::Char('e') => {
explorer.input_mode = InputMode::Repl;
explorer.repl_output = None;
}
KeyCode::Char('t') => {
explorer.input_mode = InputMode::Trace;
explorer.trace_input.clear();
explorer.trace_output = Some(explorer.compute_trace(""));
}
KeyCode::Char('g') => {
explorer.show_guards = !explorer.show_guards;
let status = if explorer.show_guards {
"Guards ON"
} else {
"Guards OFF"
};
explorer.status_message = Some((status.into(), false));
}
KeyCode::Char('h') => {
explorer.input_mode = InputMode::Hypothesis;
explorer.hypothesis_output = None;
}
KeyCode::Char('w') => {
explorer.input_mode = InputMode::Walk;
explorer.walk_input.clear();
}
KeyCode::Char('u') => {
explorer.input_mode = InputMode::StepUntil;
explorer.step_until_input.clear();
}
KeyCode::Char('s') => {
let path = Path::new("trace.json");
match explorer.save_trace(path, &ctx.spec.vars, ctx.initial) {
Ok(()) => {
explorer.status_message =
Some((format!("Saved trace to {}", path.display()), false));
}
Err(e) => {
explorer.status_message =
Some((format!("Save failed: {}", e), true));
}
}
}
KeyCode::Char('l') => {
let path = Path::new("trace.json");
match ExplorerState::load_trace(
path,
ctx.spec,
ctx.env,
ctx.defs,
ctx.initial,
) {
Ok(loaded) => {
*explorer = loaded;
explorer.status_message =
Some((format!("Loaded trace from {}", path.display()), false));
}
Err(e) => {
explorer.status_message =
Some((format!("Load failed: {}", e), true));
}
}
}
_ => {}
},
}
}
}
}
pub(super) fn run_replay_app(
terminal: &mut Terminal<CrosstermBackend<io::Stdout>>,
explorer: &mut ExplorerState,
spec: &Spec,
env: &mut Env,
defs: &Definitions,
) -> io::Result<()> {
loop {
terminal.draw(|f| ui_replay(f, explorer, spec, env, defs))?;
if let Event::Key(key) = event::read()? {
if key.kind != KeyEventKind::Press {
continue;
}
match key.code {
KeyCode::Char('q') | KeyCode::Esc => return Ok(()),
KeyCode::Char('n') | KeyCode::Right | KeyCode::Down => {
if explorer.replay_position < explorer.replay_trace.len() - 1 {
explorer.replay_position += 1;
explorer.current =
explorer.replay_trace[explorer.replay_position].0.clone();
let action = &explorer.replay_trace[explorer.replay_position].1;
explorer.status_message = Some((
format!(
"Step {}/{} - {}",
explorer.replay_position,
explorer.replay_trace.len() - 1,
action
.as_ref()
.map(|a| a.to_string())
.unwrap_or_else(|| "Init".to_string())
),
false,
));
} else {
explorer.status_message = Some(("At end of trace".to_string(), true));
}
}
KeyCode::Char('p') | KeyCode::Left | KeyCode::Up => {
if explorer.replay_position > 0 {
explorer.replay_position -= 1;
explorer.current =
explorer.replay_trace[explorer.replay_position].0.clone();
let action = &explorer.replay_trace[explorer.replay_position].1;
explorer.status_message = Some((
format!(
"Step {}/{} - {}",
explorer.replay_position,
explorer.replay_trace.len() - 1,
action
.as_ref()
.map(|a| a.to_string())
.unwrap_or_else(|| "Init".to_string())
),
false,
));
} else {
explorer.status_message = Some(("At start of trace".to_string(), true));
}
}
KeyCode::Char('e') => {
explorer.input_mode = InputMode::Repl;
explorer.repl_output = None;
}
_ => {}
}
if explorer.input_mode == InputMode::Repl {
match key.code {
KeyCode::Esc => {
explorer.input_mode = InputMode::Normal;
explorer.repl_input.clear();
explorer.repl_output = None;
}
KeyCode::Enter => {
let result =
eval_repl(&explorer.repl_input, &explorer.current, spec, env, defs);
explorer.repl_output = Some(result);
explorer.repl_input.clear();
}
KeyCode::Backspace => {
explorer.repl_input.pop();
}
KeyCode::Char(c) if explorer.input_mode == InputMode::Repl => {
explorer.repl_input.push(c);
}
_ => {}
}
}
}
}
}