// Consolidation pipeline: plan → agents → apply → digests → links
//
// consolidate_full() runs the full autonomous consolidation:
//   1. Plan: analyze metrics, allocate agents
//   2. Execute: run each agent, parse + apply actions inline
//   3. Graph maintenance (orphans, degree cap)
//   4. Digest: generate missing daily/weekly/monthly digests
//   5. Links: apply links extracted from digests
//   6. Summary: final metrics comparison
//
// Actions are parsed directly from agent output using the same parser
// as the knowledge loop (WRITE_NODE, LINK, REFINE), eliminating the
// second LLM call that was previously needed.

use super::digest;
use super::knowledge;
use crate::neuro;
use crate::store::{self, Store};


/// Append a line to the log buffer.
fn log_line(buf: &mut String, line: &str) {
    buf.push_str(line);
    buf.push('\n');
}

/// Run the full autonomous consolidation pipeline with logging.
/// If `on_progress` is provided, it's called at each significant step.
pub fn consolidate_full(store: &mut Store) -> Result<(), String> {
    consolidate_full_with_progress(store, &|_| {})
}

pub fn consolidate_full_with_progress(
    store: &mut Store,
    on_progress: &dyn Fn(&str),
) -> Result<(), String> {
    let start = std::time::Instant::now();
    let log_key = format!("_consolidate-log-{}",
        store::format_datetime(store::now_epoch()).replace([':', '-', 'T'], ""));
    let mut log_buf = String::new();

    log_line(&mut log_buf, "=== CONSOLIDATE FULL ===");
    log_line(&mut log_buf, &format!("Started: {}", store::format_datetime(store::now_epoch())));
    log_line(&mut log_buf, &format!("Nodes: {}  Relations: {}", store.nodes.len(), store.relations.len()));
    log_line(&mut log_buf, "");

    // --- Step 1: Plan ---
    log_line(&mut log_buf, "--- Step 1: Plan ---");
    on_progress("planning");
    let plan = neuro::consolidation_plan(store);
    let plan_text = neuro::format_plan(&plan);
    log_line(&mut log_buf, &plan_text);
    println!("{}", plan_text);

    let total_agents = plan.replay_count + plan.linker_count
        + plan.separator_count + plan.transfer_count
        + if plan.run_health { 1 } else { 0 };
    log_line(&mut log_buf, &format!("Total agents to run: {}", total_agents));

    // --- Step 2: Execute agents ---
    log_line(&mut log_buf, "\n--- Step 2: Execute agents ---");
    let mut agent_num = 0usize;
    let mut agent_errors = 0usize;
    let mut total_applied = 0usize;
    let mut total_actions = 0usize;

    // Build the list of (agent_type, batch_size) runs
    let mut runs: Vec<(&str, usize)> = Vec::new();
    if plan.run_health {
        runs.push(("health", 0));
    }
    let batch_size = 5;
    for (name, count) in [
        ("replay", plan.replay_count),
        ("linker", plan.linker_count),
        ("separator", plan.separator_count),
        ("transfer", plan.transfer_count),
    ] {
        let mut remaining = count;
        while remaining > 0 {
            let batch = remaining.min(batch_size);
            runs.push((name, batch));
            remaining -= batch;
        }
    }

    for (agent_type, count) in &runs {
        agent_num += 1;
        let label = if *count > 0 {
            format!("[{}/{}] {} (batch={})", agent_num, runs.len(), agent_type, count)
        } else {
            format!("[{}/{}] {}", agent_num, runs.len(), agent_type)
        };

        log_line(&mut log_buf, &format!("\n{}", label));
        on_progress(&label);
        println!("{}", label);

        // Reload store to pick up changes from previous agents
        if agent_num > 1 {
            *store = Store::load()?;
        }

        let result = match knowledge::run_one_agent(store, agent_type, *count, "consolidate") {
            Ok(r) => r,
            Err(e) => {
                let msg = format!("  ERROR: {}", e);
                log_line(&mut log_buf, &msg);
                eprintln!("{}", msg);
                agent_errors += 1;
                continue;
            }
        };

        let ts = store::format_datetime(store::now_epoch())
            .replace([':', '-', 'T'], "");
        let mut applied = 0;
        for action in &result.actions {
            if knowledge::apply_action(store, action, agent_type, &ts, 0) {
                applied += 1;
            }
        }
        total_actions += result.actions.len();
        total_applied += applied;

        let msg = format!("  Done: {} actions ({} applied, {} no-ops)",
            result.actions.len(), applied, result.no_ops);
        log_line(&mut log_buf, &msg);
        on_progress(&msg);
        println!("{}", msg);
    }

    log_line(&mut log_buf, &format!("\nAgents complete: {} run, {} errors, {} actions ({} applied)",
        agent_num - agent_errors, agent_errors, total_actions, total_applied));
    store.save()?;

    // --- Step 3: Link orphans ---
    log_line(&mut log_buf, "\n--- Step 3: Link orphans ---");
    on_progress("linking orphans");
    println!("\n--- Linking orphan nodes ---");
    *store = Store::load()?;

    let (lo_orphans, lo_added) = neuro::link_orphans(store, 2, 3, 0.15);
    log_line(&mut log_buf, &format!("  {} orphans, {} links added", lo_orphans, lo_added));

    // --- Step 3b: Cap degree ---
    log_line(&mut log_buf, "\n--- Step 3b: Cap degree ---");
    on_progress("capping degree");
    println!("\n--- Capping node degree ---");
    *store = Store::load()?;

    match store.cap_degree(50) {
        Ok((hubs, pruned)) => {
            store.save()?;
            log_line(&mut log_buf, &format!("  {} hubs capped, {} edges pruned", hubs, pruned));
        }
        Err(e) => log_line(&mut log_buf, &format!("  ERROR: {}", e)),
    }

    // --- Step 4: Digest auto ---
    log_line(&mut log_buf, "\n--- Step 4: Digest auto ---");
    on_progress("generating digests");
    println!("\n--- Generating missing digests ---");
    *store = Store::load()?;

    match digest::digest_auto(store) {
        Ok(()) => log_line(&mut log_buf, "  Digests done."),
        Err(e) => {
            let msg = format!("  ERROR in digest auto: {}", e);
            log_line(&mut log_buf, &msg);
            eprintln!("{}", msg);
        }
    }

    // --- Step 5: Apply digest links ---
    log_line(&mut log_buf, "\n--- Step 5: Apply digest links ---");
    on_progress("applying digest links");
    println!("\n--- Applying digest links ---");
    *store = Store::load()?;

    let links = digest::parse_all_digest_links(store);
    let (applied, skipped, fallbacks) = digest::apply_digest_links(store, &links);
    store.save()?;
    log_line(&mut log_buf, &format!("  {} links applied, {} skipped, {} fallbacks",
        applied, skipped, fallbacks));

    // --- Step 6: Summary ---
    let elapsed = start.elapsed();
    log_line(&mut log_buf, "\n--- Summary ---");
    log_line(&mut log_buf, &format!("Finished: {}", store::format_datetime(store::now_epoch())));
    log_line(&mut log_buf, &format!("Duration: {:.0}s", elapsed.as_secs_f64()));
    *store = Store::load()?;
    log_line(&mut log_buf, &format!("Nodes: {}  Relations: {}", store.nodes.len(), store.relations.len()));

    let summary = format!(
        "\n=== CONSOLIDATE FULL COMPLETE ===\n\
         Duration: {:.0}s\n\
         Agents: {} run, {} errors\n\
         Nodes: {}  Relations: {}\n",
        elapsed.as_secs_f64(),
        agent_num - agent_errors, agent_errors,
        store.nodes.len(), store.relations.len(),
    );
    log_line(&mut log_buf, &summary);
    println!("{}", summary);

    // Store the log as a node
    store.upsert_provenance(&log_key, &log_buf,
        store::Provenance::AgentConsolidate).ok();
    store.save()?;

    Ok(())
}

/// Re-parse and apply actions from stored consolidation reports.
/// This is for manually re-processing reports — during normal consolidation,
/// actions are applied inline as each agent runs.
pub fn apply_consolidation(store: &mut Store, do_apply: bool, report_key: Option<&str>) -> Result<(), String> {
    let reports: Vec<String> = if let Some(key) = report_key {
        vec![key.to_string()]
    } else {
        // Find the most recent batch of reports
        let mut keys: Vec<&String> = store.nodes.keys()
            .filter(|k| k.starts_with("_consolidation-") && !k.contains("-actions-") && !k.contains("-log-"))
            .collect();
        keys.sort();
        keys.reverse();

        if keys.is_empty() { return Ok(()); }

        let latest_ts = keys[0].rsplit('-').next().unwrap_or("").to_string();
        keys.into_iter()
            .filter(|k| k.ends_with(&latest_ts))
            .cloned()
            .collect()
    };

    if reports.is_empty() {
        println!("No consolidation reports found.");
        return Ok(());
    }

    println!("Found {} reports:", reports.len());
    let mut all_actions = Vec::new();
    for key in &reports {
        let content = store.nodes.get(key).map(|n| n.content.as_str()).unwrap_or("");
        let actions = knowledge::parse_all_actions(content);
        println!("  {} → {} actions", key, actions.len());
        all_actions.extend(actions);
    }

    if !do_apply {
        println!("\nDRY RUN — {} actions parsed", all_actions.len());
        for action in &all_actions {
            match &action.kind {
                knowledge::ActionKind::Link { source, target } =>
                    println!("  LINK {} → {}", source, target),
                knowledge::ActionKind::WriteNode { key, .. } =>
                    println!("  WRITE {}", key),
                knowledge::ActionKind::Refine { key, .. } =>
                    println!("  REFINE {}", key),
            }
        }
        println!("\nTo apply: poc-memory apply-consolidation --apply");
        return Ok(());
    }

    let ts = store::format_datetime(store::now_epoch()).replace([':', '-', 'T'], "");
    let mut applied = 0;
    for action in &all_actions {
        if knowledge::apply_action(store, action, "consolidate", &ts, 0) {
            applied += 1;
        }
    }

    if applied > 0 {
        store.save()?;
    }

    println!("Applied: {}/{}  actions", applied, all_actions.len());
    Ok(())
}