// 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,
// start the next. Agents can be toggled on/off, persisted to
// ~/.consciousness/agent-enabled.json.

use std::time::Instant;
use std::collections::HashMap;
use futures::FutureExt;

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

fn config_path() -> std::path::PathBuf {
    dirs::home_dir().unwrap_or_default()
        .join(".consciousness/agent-enabled.json")
}

fn load_enabled_config() -> HashMap<String, bool> {
    std::fs::read_to_string(config_path()).ok()
        .and_then(|s| serde_json::from_str(&s).ok())
        .unwrap_or_default()
}

fn save_enabled_config(map: &HashMap<String, bool>) {
    if let Ok(json) = serde_json::to_string_pretty(map) {
        let _ = std::fs::write(config_path(), json);
    }
}

struct UnconsciousAgent {
    name: String,
    enabled: bool,
    auto: AutoAgent,
    handle: Option<tokio::task::JoinHandle<(AutoAgent, Result<String, String>)>>,
    /// Shared agent handle — UI locks to read context live.
    pub agent: Option<std::sync::Arc<crate::agent::Agent>>,
    last_run: Option<Instant>,
    runs: usize,
}

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

    fn should_run(&self) -> bool {
        self.enabled && !self.is_running()
    }
}

/// 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 agent: Option<std::sync::Arc<crate::agent::Agent>>,
}

pub struct Unconscious {
    agents: Vec<UnconsciousAgent>,
    max_concurrent: usize,
    pub graph_health: Option<crate::subconscious::daemon::GraphHealth>,
    last_health_check: Option<Instant>,
}

impl Unconscious {
    pub fn new() -> Self {
        let enabled_map = load_enabled_config();

        // Scan all .agent files, exclude subconscious-* and surface-observe
        let mut agents: Vec<UnconsciousAgent> = Vec::new();
        let all_tools = tools::memory::memory_tools().to_vec();
        for def in defs::load_defs() {
            if def.agent.starts_with("subconscious-") { continue; }
            if def.agent == "surface-observe" { continue; }
            let enabled = enabled_map.get(&def.agent).copied()
                .unwrap_or(false);
            let effective_tools: Vec<tools::Tool> = if def.tools.is_empty() {
                all_tools.clone()
            } else {
                all_tools.iter()
                    .filter(|t| def.tools.iter().any(|w| w == t.name))
                    .cloned()
                    .collect()
            };
            let steps: Vec<AutoStep> = def.steps.iter().map(|s| AutoStep {
                prompt: s.prompt.clone(),
                phase: s.phase.clone(),
            }).collect();
            let auto = AutoAgent::new(
                def.agent.clone(), effective_tools, steps,
                def.temperature.unwrap_or(0.6), def.priority,
            );
            agents.push(UnconsciousAgent {
                name: def.agent.clone(),
                enabled,
                auto,
                handle: None,
                agent: None,
                last_run: None,
                runs: 0,
            });
        }
        agents.sort_by(|a, b| a.name.cmp(&b.name));

        Self {
            agents, max_concurrent: 2,
            graph_health: None,
            last_health_check: None,
        }
    }

    /// Toggle an agent on/off by name. Returns new enabled state.
    /// If enabling, immediately spawns the agent if it's not running.
    pub async fn toggle(&mut self, name: &str) -> Option<bool> {
        let idx = self.agents.iter().position(|a| a.name == name)?;
        self.agents[idx].enabled = !self.agents[idx].enabled;
        let new_state = self.agents[idx].enabled;
        self.save_enabled();
        if new_state && !self.agents[idx].is_running() {
            self.spawn_agent(idx).await;
        }
        Some(new_state)
    }

    fn save_enabled(&self) {
        let map: HashMap<String, bool> = self.agents.iter()
            .map(|a| (a.name.clone(), a.enabled))
            .collect();
        save_enabled_config(&map);
    }

    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()),
            agent: a.agent.clone(),
        }).collect()
    }

    fn refresh_health(&mut self) {
        let store = match crate::store::Store::load() {
            Ok(s) => s,
            Err(_) => return,
        };
        self.graph_health = Some(crate::subconscious::daemon::compute_graph_health(&store));
        self.last_health_check = Some(Instant::now());
    }

    /// Reap finished agents and spawn new ones.
    pub async fn trigger(&mut self) {
        // Periodic graph health refresh (also on first call)
        if self.last_health_check
            .map(|t| t.elapsed() > std::time::Duration::from_secs(600))
            .unwrap_or(true)
        {
            self.refresh_health();
        }

        for agent in &mut self.agents {
            if agent.handle.as_ref().is_some_and(|h| h.is_finished()) {
                let handle = agent.handle.take().unwrap();
                agent.last_run = Some(Instant::now());
                agent.runs += 1;
                // Get the AutoAgent back from the finished task
                match handle.now_or_never() {
                    Some(Ok((auto_back, result))) => {
                        agent.auto = auto_back;
                        match result {
                            Ok(_) => dbglog!("[unconscious] {} completed (run {})",
                                agent.name, agent.runs),
                            Err(e) => dbglog!("[unconscious] {} failed: {}", agent.name, e),
                        }
                    }
                    _ => dbglog!("[unconscious] {} task lost", agent.name),
                }
            }
        }

        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).await;
        }
    }

    async 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,
        };

        // Run query and resolve placeholders
        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();
        }

        // Swap auto out, replace steps with resolved prompts
        let mut auto = std::mem::replace(&mut self.agents[idx].auto,
            AutoAgent::new(String::new(), vec![], vec![], 0.0, 0));
        let orig_steps = std::mem::replace(&mut auto.steps,
            batch.steps.iter().map(|s| AutoStep {
                prompt: s.prompt.clone(),
                phase: s.phase.clone(),
            }).collect());

        // Create standalone Agent — stored so UI can read context
        let config = crate::config::get();
        let base_url = config.api_base_url.as_deref().unwrap_or("");
        let api_key = config.api_key.as_deref().unwrap_or("");
        let model = config.api_model.as_deref().unwrap_or("");
        if base_url.is_empty() || model.is_empty() {
            dbglog!("[unconscious] API not configured");
            auto.steps = orig_steps;
            self.agents[idx].auto = auto;
            return;
        }

        let cli = crate::user::CliArgs::default();
        let (app, _) = match crate::config::load_app(&cli) {
            Ok(r) => r,
            Err(e) => {
                dbglog!("[unconscious] config: {}", e);
                auto.steps = orig_steps;
                self.agents[idx].auto = auto;
                return;
            }
        };
        let (system_prompt, personality) = match crate::config::reload_for_model(&app, &app.prompts.other) {
            Ok(r) => r,
            Err(e) => {
                dbglog!("[unconscious] config: {}", e);
                auto.steps = orig_steps;
                self.agents[idx].auto = auto;
                return;
            }
        };

        let client = crate::agent::api::ApiClient::new(base_url, api_key, model);
        let agent = crate::agent::Agent::new(
            client, system_prompt, personality,
            app, String::new(), None,
            crate::agent::tools::ActiveTools::new(),
        ).await;
        {
            let mut st = agent.state.lock().await;
            st.provenance = format!("unconscious:{}", auto.name);
            st.tools = auto.tools.clone();
            st.priority = Some(10);
        }

        self.agents[idx].agent = Some(agent.clone());

        self.agents[idx].handle = Some(tokio::spawn(async move {
            let result = auto.run_shared(&agent).await;
            save_agent_log(&auto.name, &agent).await;
            auto.steps = orig_steps;
            (auto, result)
        }));
    }
}

async fn save_agent_log(name: &str, agent: &std::sync::Arc<crate::agent::Agent>) {
    let dir = dirs::home_dir().unwrap_or_default()
        .join(format!(".consciousness/logs/{}", name));
    if std::fs::create_dir_all(&dir).is_err() { return; }
    let ts = chrono::Utc::now().format("%Y%m%d-%H%M%S");
    let path = dir.join(format!("{}.json", ts));
    let nodes: Vec<crate::agent::context::AstNode> = {
        let ctx = agent.context.lock().await;
        ctx.conversation().to_vec()
    };
    if let Ok(json) = serde_json::to_string_pretty(&nodes) {
        let _ = std::fs::write(&path, json);
        dbglog!("[unconscious] saved log to {}", path.display());
    }
}