// unconscious.rs — Graph maintenance agents
//
// Standalone agents that operate on the memory graph without needing
// conversation context. Each agent runs in a loop: finish one run,
// wait a cooldown, start the next. Agents can be toggled on/off.

use std::time::{Duration, Instant};

use crate::agent::oneshot::{AutoAgent, AutoStep};
use crate::agent::tools;
use crate::subconscious::defs;

/// Agent types to run. Each must have a matching .agent file.
const AGENTS: &[&str] = &[
    "organize",
    "linker",
    "distill",
    "split",
    "separator",
];

/// Cooldown between consecutive runs of the same agent.
const COOLDOWN: Duration = Duration::from_secs(120);

struct UnconsciousAgent {
    name: String,
    enabled: bool,
    handle: Option<tokio::task::JoinHandle<(AutoAgent, Result<String, String>)>>,
    last_run: Option<Instant>,
    runs: usize,
}

impl UnconsciousAgent {
    fn new(name: &str) -> Self {
        Self {
            name: name.to_string(),
            enabled: true,
            handle: None,
            last_run: None,
            runs: 0,
        }
    }

    fn is_running(&self) -> bool {
        self.handle.as_ref().is_some_and(|h| !h.is_finished())
    }

    fn should_run(&self) -> bool {
        if !self.enabled || self.is_running() { return false; }
        match self.last_run {
            Some(t) => t.elapsed() >= COOLDOWN,
            None => true,
        }
    }
}

/// Snapshot for the TUI.
#[derive(Clone)]
pub struct UnconsciousSnapshot {
    pub name: String,
    pub running: bool,
    pub enabled: bool,
    pub runs: usize,
    pub last_run_secs_ago: Option<f64>,
}

pub struct Unconscious {
    agents: Vec<UnconsciousAgent>,
    max_concurrent: usize,
}

impl Unconscious {
    pub fn new() -> Self {
        let agents = AGENTS.iter()
            .filter(|name| defs::get_def(name).is_some())
            .map(|name| UnconsciousAgent::new(name))
            .collect();
        Self { agents, max_concurrent: 2 }
    }

    /// Toggle an agent on/off by name. Returns new enabled state.
    pub fn toggle(&mut self, name: &str) -> Option<bool> {
        let agent = self.agents.iter_mut().find(|a| a.name == name)?;
        agent.enabled = !agent.enabled;
        Some(agent.enabled)
    }

    pub fn snapshots(&self) -> Vec<UnconsciousSnapshot> {
        self.agents.iter().map(|a| UnconsciousSnapshot {
            name: a.name.clone(),
            running: a.is_running(),
            enabled: a.enabled,
            runs: a.runs,
            last_run_secs_ago: a.last_run.map(|t| t.elapsed().as_secs_f64()),
        }).collect()
    }

    /// Reap finished agents and spawn new ones.
    pub fn trigger(&mut self) {
        for agent in &mut self.agents {
            if agent.handle.as_ref().is_some_and(|h| h.is_finished()) {
                agent.last_run = Some(Instant::now());
                agent.runs += 1;
                dbglog!("[unconscious] {} completed (run {})",
                    agent.name, agent.runs);
                agent.handle = None;
            }
        }

        let running = self.agents.iter().filter(|a| a.is_running()).count();
        if running >= self.max_concurrent { return; }
        let slots = self.max_concurrent - running;

        let ready: Vec<usize> = self.agents.iter().enumerate()
            .filter(|(_, a)| a.should_run())
            .map(|(i, _)| i)
            .take(slots)
            .collect();

        for idx in ready {
            self.spawn_agent(idx);
        }
    }

    fn spawn_agent(&mut self, idx: usize) {
        let name = self.agents[idx].name.clone();
        dbglog!("[unconscious] spawning {}", name);

        let def = match defs::get_def(&name) {
            Some(d) => d,
            None => return,
        };

        let all_tools = tools::memory_and_journal_tools();
        let effective_tools: Vec<tools::Tool> = if def.tools.is_empty() {
            all_tools
        } else {
            all_tools.into_iter()
                .filter(|t| def.tools.iter().any(|w| w == t.name))
                .collect()
        };

        let mut store = match crate::store::Store::load() {
            Ok(s) => s,
            Err(e) => {
                dbglog!("[unconscious] store load failed: {}", e);
                return;
            }
        };

        let exclude: std::collections::HashSet<String> = std::collections::HashSet::new();
        let batch = match defs::run_agent(
            &store, &def, def.count.unwrap_or(5), &exclude,
        ) {
            Ok(b) => b,
            Err(e) => {
                dbglog!("[unconscious] {} query failed: {}", name, e);
                return;
            }
        };

        if !batch.node_keys.is_empty() {
            store.record_agent_visits(&batch.node_keys, &name).ok();
        }

        let steps: Vec<AutoStep> = batch.steps.iter().map(|s| AutoStep {
            prompt: s.prompt.clone(),
            phase: s.phase.clone(),
        }).collect();

        let mut auto = AutoAgent::new(
            name, effective_tools, steps,
            def.temperature.unwrap_or(0.6),
            def.priority,
        );

        self.agents[idx].handle = Some(tokio::spawn(async move {
            let result = auto.run(None).await;
            (auto, result)
        }));
    }
}