// user/ — User interface layer
//
// TUI, UI channel, parsing. The cognitive layer (session state
// machine, DMN, identity) lives in mind/.

pub mod ui_channel;
pub mod event_loop;

pub mod chat;
pub mod context;
pub mod subconscious;
pub mod unconscious;
pub mod thalamus;

// --- TUI infrastructure (moved from tui/mod.rs) ---

use ratatui::crossterm::{
    event::{EnableMouseCapture, DisableMouseCapture, KeyCode, KeyEvent, KeyModifiers},
    terminal::{self, EnterAlternateScreen, LeaveAlternateScreen},
    ExecutableCommand,
};
use ratatui::{
    backend::CrosstermBackend,
    style::{Color, Style},
    text::{Line, Span},
};
use std::io;

use crate::user::ui_channel::{ContextInfo, SharedContextState, StatusInfo};

/// Build the screen legend from the screen table.
pub(crate) fn screen_legend() -> String {
    // Built from the SCREENS table in event_loop
    " F1=interact  F2=conscious  F3=subconscious  F4=unconscious  F5=thalamus ".to_string()
}

pub(crate) fn strip_ansi(text: &str) -> String {
    let mut out = String::with_capacity(text.len());
    let mut chars = text.chars().peekable();
    while let Some(ch) = chars.next() {
        if ch == '\x1b' {
            if chars.peek() == Some(&'[') {
                chars.next();
                while let Some(&c) = chars.peek() {
                    if c.is_ascii() && (0x20..=0x3F).contains(&(c as u8)) {
                        chars.next();
                    } else {
                        break;
                    }
                }
                if let Some(&c) = chars.peek() {
                    if c.is_ascii() && (0x40..=0x7E).contains(&(c as u8)) {
                        chars.next();
                    }
                }
            } else if let Some(&c) = chars.peek() {
                if c.is_ascii() && (0x40..=0x5F).contains(&(c as u8)) {
                    chars.next();
                }
            }
        } else {
            out.push(ch);
        }
    }
    out
}

pub(crate) fn is_zero_width(ch: char) -> bool {
    matches!(ch,
        '\u{200B}'..='\u{200F}' |
        '\u{2028}'..='\u{202F}' |
        '\u{2060}'..='\u{2069}' |
        '\u{FEFF}'
    )
}

/// Which pane receives scroll keys.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum ActivePane {
    Autonomous,
    Conversation,
    Tools,
}

const MAX_PANE_LINES: usize = 10_000;

/// Turn marker for the conversation pane gutter.
#[derive(Clone, Copy, PartialEq, Default)]
pub(crate) enum Marker {
    #[default]
    None,
    User,
    Assistant,
}

pub(crate) struct PaneState {
    pub(crate) lines: Vec<Line<'static>>,
    pub(crate) markers: Vec<Marker>,
    pub(crate) current_line: String,
    pub(crate) current_color: Color,
    pub(crate) md_buffer: String,
    pub(crate) use_markdown: bool,
    pub(crate) pending_marker: Marker,
    pub(crate) scroll: u16,
    pub(crate) pinned: bool,
    pub(crate) last_total_lines: u16,
    pub(crate) last_height: u16,
}

impl PaneState {
    fn new(use_markdown: bool) -> Self {
        Self {
            lines: Vec::new(), markers: Vec::new(),
            current_line: String::new(), current_color: Color::Reset,
            md_buffer: String::new(), use_markdown,
            pending_marker: Marker::None, scroll: 0, pinned: false,
            last_total_lines: 0, last_height: 20,
        }
    }

    fn evict(&mut self) {
        if self.lines.len() > MAX_PANE_LINES {
            let excess = self.lines.len() - MAX_PANE_LINES;
            self.lines.drain(..excess);
            self.markers.drain(..excess);
            self.scroll = self.scroll.saturating_sub(excess as u16);
        }
    }

    fn append_text(&mut self, text: &str) {
        let clean = strip_ansi(text);
        if self.use_markdown {
            self.md_buffer.push_str(&clean);
        } else {
            for ch in clean.chars() {
                if ch == '\n' {
                    let line = std::mem::take(&mut self.current_line);
                    self.lines.push(Line::styled(line, Style::default().fg(self.current_color)));
                    self.markers.push(Marker::None);
                } else if ch == '\t' {
                    self.current_line.push_str("    ");
                } else if ch.is_control() || is_zero_width(ch) {
                } else {
                    self.current_line.push(ch);
                }
            }
        }
        self.evict();
    }

    pub(crate) fn flush_pending(&mut self) {
        if self.use_markdown && !self.md_buffer.is_empty() {
            let parsed = parse_markdown(&self.md_buffer);
            for (i, line) in parsed.into_iter().enumerate() {
                let marker = if i == 0 { std::mem::take(&mut self.pending_marker) } else { Marker::None };
                self.lines.push(line);
                self.markers.push(marker);
            }
            self.md_buffer.clear();
        }
        if !self.current_line.is_empty() {
            let line = std::mem::take(&mut self.current_line);
            self.lines.push(Line::styled(line, Style::default().fg(self.current_color)));
            self.markers.push(std::mem::take(&mut self.pending_marker));
        }
    }

    fn push_line(&mut self, line: String, color: Color) {
        self.push_line_with_marker(line, color, Marker::None);
    }

    fn push_line_with_marker(&mut self, line: String, color: Color, marker: Marker) {
        self.flush_pending();
        self.lines.push(Line::styled(strip_ansi(&line), Style::default().fg(color)));
        self.markers.push(marker);
        self.evict();
    }

    fn scroll_up(&mut self, n: u16) {
        self.scroll = self.scroll.saturating_sub(n);
        self.pinned = true;
    }

    fn scroll_down(&mut self, n: u16) {
        let max = self.last_total_lines.saturating_sub(self.last_height);
        self.scroll = (self.scroll + n).min(max);
        if self.scroll >= max { self.pinned = false; }
    }

    pub(crate) fn all_lines(&self) -> Vec<Line<'static>> {
        let (lines, _) = self.all_lines_with_markers();
        lines
    }

    pub(crate) fn all_lines_with_markers(&self) -> (Vec<Line<'static>>, Vec<Marker>) {
        let mut lines: Vec<Line<'static>> = self.lines.clone();
        let mut markers: Vec<Marker> = self.markers.clone();
        if self.use_markdown && !self.md_buffer.is_empty() {
            let parsed = parse_markdown(&self.md_buffer);
            let count = parsed.len();
            lines.extend(parsed);
            if count > 0 {
                markers.push(self.pending_marker);
                markers.extend(std::iter::repeat(Marker::None).take(count - 1));
            }
        } else if !self.current_line.is_empty() {
            lines.push(Line::styled(self.current_line.clone(), Style::default().fg(self.current_color)));
            markers.push(self.pending_marker);
        }
        (lines, markers)
    }
}

pub(crate) fn new_textarea(lines: Vec<String>) -> tui_textarea::TextArea<'static> {
    let mut ta = tui_textarea::TextArea::new(lines);
    ta.set_cursor_line_style(Style::default());
    ta.set_wrap_mode(tui_textarea::WrapMode::Word);
    ta
}

pub(crate) fn parse_markdown(md: &str) -> Vec<Line<'static>> {
    tui_markdown::from_str(md)
        .lines
        .into_iter()
        .map(|line| {
            let spans: Vec<Span<'static>> = line.spans.into_iter()
                .map(|span| Span::styled(span.content.into_owned(), span.style))
                .collect();
            let mut result = Line::from(spans).style(line.style);
            result.alignment = line.alignment;
            result
        })
        .collect()
}

/// Action returned from a screen's tick method.
pub enum ScreenAction {
    /// Switch to screen at this index
    Switch(usize),
    /// Send a hotkey action to the Mind
    Hotkey(HotkeyAction),
}

/// A screen that can draw itself and handle input.
pub(crate) trait ScreenView: Send {
    fn tick(&mut self, frame: &mut ratatui::Frame, area: ratatui::layout::Rect,
            key: Option<ratatui::crossterm::event::KeyEvent>, app: &mut App) -> Option<ScreenAction>;
    fn label(&self) -> &'static str;
}

#[derive(Debug)]
pub enum HotkeyAction {
    CycleReasoning, KillProcess, Interrupt, CycleAutonomy,
    /// Adjust a sampling parameter: (param_index, delta)
    /// 0=temperature, 1=top_p, 2=top_k
    AdjustSampling(usize, f32),
}

#[derive(Clone)]
pub(crate) struct IdleInfo {
    pub user_present: bool,
    pub since_activity: f64,
    pub activity_ewma: f64,
    pub block_reason: String,
    pub dreaming: bool,
    pub sleeping: bool,
}

#[derive(Clone)]
pub(crate) struct ChannelStatus {
    pub name: String,
    pub connected: bool,
    pub unread: u32,
}

pub struct App {
    pub(crate) status: StatusInfo,
    pub(crate) activity: String,
    pub running_processes: u32,
    pub reasoning_effort: String,
    pub temperature: f32,
    pub top_p: f32,
    pub top_k: u32,
    pub(crate) active_tools: crate::user::ui_channel::SharedActiveTools,
    pub should_quit: bool,
    pub submitted: Vec<String>,
    pub hotkey_actions: Vec<HotkeyAction>,
    pub(crate) context_info: Option<ContextInfo>,
    pub(crate) shared_context: SharedContextState,
    pub(crate) agent_state: Vec<crate::subconscious::subconscious::AgentSnapshot>,
    pub(crate) channel_status: Vec<ChannelStatus>,
    pub(crate) idle_info: Option<IdleInfo>,
}

impl App {
    pub fn new(model: String, shared_context: SharedContextState, active_tools: crate::user::ui_channel::SharedActiveTools) -> Self {
        Self {
            status: StatusInfo {
                dmn_state: "resting".into(), dmn_turns: 0, dmn_max_turns: 20,
                prompt_tokens: 0, completion_tokens: 0, model,
                turn_tools: 0, context_budget: String::new(),
            },
            activity: String::new(),
            running_processes: 0,
            reasoning_effort: "none".to_string(),
            temperature: 0.6,
            top_p: 0.95,
            top_k: 20,
            active_tools,
            should_quit: false, submitted: Vec::new(), hotkey_actions: Vec::new(),
            context_info: None, shared_context,
            agent_state: Vec::new(),
            channel_status: Vec::new(), idle_info: None,
        }
    }

    pub fn handle_global_key_old(&mut self, _key: KeyEvent) -> bool { false } // placeholder

    /// Handle global keys only (Ctrl combos).
    pub fn handle_global_key(&mut self, key: KeyEvent) -> bool {
        if key.modifiers.contains(KeyModifiers::CONTROL) {
            match key.code {
                KeyCode::Char('c') => { self.should_quit = true; return true; }
                KeyCode::Char('r') => { self.hotkey_actions.push(HotkeyAction::CycleReasoning); return true; }
                KeyCode::Char('k') => { self.hotkey_actions.push(HotkeyAction::KillProcess); return true; }
                KeyCode::Char('p') => { self.hotkey_actions.push(HotkeyAction::CycleAutonomy); return true; }
                _ => {}
            }
        }
        false
    }

    pub fn set_channel_status(&mut self, channels: Vec<(String, bool, u32)>) {
        self.channel_status = channels.into_iter()
            .map(|(name, connected, unread)| ChannelStatus { name, connected, unread })
            .collect();
    }

    pub fn update_idle(&mut self, state: &crate::thalamus::idle::State) {
        self.idle_info = Some(IdleInfo {
            user_present: state.user_present(), since_activity: state.since_activity(),
            activity_ewma: state.activity_ewma, block_reason: state.block_reason().to_string(),
            dreaming: state.dreaming, sleeping: state.sleep_until.is_some(),
        });
    }

}

pub fn init_terminal() -> io::Result<ratatui::Terminal<CrosstermBackend<io::Stdout>>> {
    terminal::enable_raw_mode()?;
    let mut stdout = io::stdout();
    stdout.execute(EnterAlternateScreen)?;
    stdout.execute(EnableMouseCapture)?;
    let backend = CrosstermBackend::new(stdout);
    ratatui::Terminal::new(backend)
}

pub fn restore_terminal(terminal: &mut ratatui::Terminal<CrosstermBackend<io::Stdout>>) -> io::Result<()> {
    terminal::disable_raw_mode()?;
    terminal.backend_mut().execute(DisableMouseCapture)?;
    terminal.backend_mut().execute(LeaveAlternateScreen)?;
    terminal.show_cursor()
}

// --- CLI ---

use clap::{Parser, Subcommand};
use std::path::PathBuf;

#[derive(Parser, Debug)]
#[command(name = "consciousness", about = "Substrate-independent AI agent")]
pub struct CliArgs {
    /// Select active backend ("anthropic" or "openrouter")
    #[arg(long)]
    pub backend: Option<String>,

    /// Model override
    #[arg(short, long)]
    pub model: Option<String>,

    /// API key override
    #[arg(long)]
    pub api_key: Option<String>,

    /// Base URL override
    #[arg(long)]
    pub api_base: Option<String>,

    /// Enable debug logging
    #[arg(long)]
    pub debug: bool,

    /// Print effective config with provenance and exit
    #[arg(long)]
    pub show_config: bool,

    /// Override all prompt assembly with this file
    #[arg(long)]
    pub system_prompt_file: Option<PathBuf>,

    /// Project memory directory
    #[arg(long)]
    pub memory_project: Option<PathBuf>,

    /// Max consecutive DMN turns
    #[arg(long)]
    pub dmn_max_turns: Option<u32>,

    /// Disable background agents (surface, observe, scoring)
    #[arg(long)]
    pub no_agents: bool,

    #[command(subcommand)]
    pub command: Option<SubCmd>,
}

#[derive(Subcommand, Debug)]
pub enum SubCmd {
    /// Print new output since last read and exit
    Read {
        /// Stream output continuously instead of exiting
        #[arg(short, long)]
        follow: bool,
        /// Block until a complete response is received, then exit
        #[arg(long)]
        block: bool,
    },
    /// Send a message to the running agent
    Write {
        /// The message to send
        message: Vec<String>,
    },
}

#[tokio::main]
pub async fn main() {
    let cli = CliArgs::parse();

    if cli.show_config {
        match crate::config::load_app(&cli) {
            Ok((app, figment)) => crate::config::show_config(&app, &figment),
            Err(e) => {
                eprintln!("Error loading config: {:#}", e);
                std::process::exit(1);
            }
        }
        return;
    }

    if let Err(e) = crate::user::event_loop::start(cli).await {
        let _ = ratatui::crossterm::terminal::disable_raw_mode();
        let _ = ratatui::crossterm::execute!(
            std::io::stdout(),
            ratatui::crossterm::terminal::LeaveAlternateScreen
        );
        eprintln!("Error: {:#}", e);
        std::process::exit(1);
    }
}