// Neuroscience-inspired memory algorithms
//
// Systematic replay (hippocampal replay), schema assimilation,
// interference detection, emotional gating, consolidation priority
// scoring, and the agent consolidation harness.

use crate::capnp_store::Store;
use crate::graph::{self, Graph};
use crate::similarity;

use std::time::{SystemTime, UNIX_EPOCH};

fn now_epoch() -> f64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap()
        .as_secs_f64()
}

const SECS_PER_DAY: f64 = 86400.0;

/// Consolidation priority: how urgently a node needs attention
///
/// priority = (1 - schema_fit) × spaced_repetition_due × emotion × (1 + interference)
pub fn consolidation_priority(store: &Store, key: &str, graph: &Graph) -> f64 {
    let node = match store.nodes.get(key) {
        Some(n) => n,
        None => return 0.0,
    };

    // Schema fit: 0 = poorly integrated, 1 = well integrated
    let fit = graph::schema_fit(graph, key) as f64;
    let fit_factor = 1.0 - fit;

    // Spaced repetition: how overdue is this node for replay?
    let interval_secs = node.spaced_repetition_interval as f64 * SECS_PER_DAY;
    let time_since_replay = if node.last_replayed > 0.0 {
        (now_epoch() - node.last_replayed).max(0.0)
    } else {
        // Never replayed — treat as very overdue
        interval_secs * 3.0
    };
    let overdue_ratio = (time_since_replay / interval_secs).min(5.0);

    // Emotional intensity: higher emotion = higher priority
    let emotion_factor = 1.0 + (node.emotion as f64 / 10.0);

    fit_factor * overdue_ratio * emotion_factor
}

/// Item in the replay queue
pub struct ReplayItem {
    pub key: String,
    pub priority: f64,
    pub interval_days: u32,
    pub emotion: f32,
    pub schema_fit: f32,
}

/// Generate the replay queue: nodes ordered by consolidation priority
pub fn replay_queue(store: &Store, count: usize) -> Vec<ReplayItem> {
    let graph = store.build_graph();
    let fits = graph::schema_fit_all(&graph);

    let mut items: Vec<ReplayItem> = store.nodes.iter()
        .map(|(key, node)| {
            let priority = consolidation_priority(store, key, &graph);
            let fit = fits.get(key).copied().unwrap_or(0.0);
            ReplayItem {
                key: key.clone(),
                priority,
                interval_days: node.spaced_repetition_interval,
                emotion: node.emotion,
                schema_fit: fit,
            }
        })
        .collect();

    items.sort_by(|a, b| b.priority.partial_cmp(&a.priority).unwrap());
    items.truncate(count);
    items
}

/// Detect interfering memory pairs: high text similarity but different communities
pub fn detect_interference(
    store: &Store,
    graph: &Graph,
    threshold: f32,
) -> Vec<(String, String, f32)> {
    let communities = graph.communities();

    // Only compare nodes within a reasonable set — take the most active ones
    let mut docs: Vec<(String, String)> = store.nodes.iter()
        .filter(|(_, n)| n.content.len() > 50) // skip tiny nodes
        .map(|(k, n)| (k.clone(), n.content.clone()))
        .collect();

    // For large stores, sample to keep pairwise comparison feasible
    if docs.len() > 200 {
        docs.sort_by(|a, b| b.1.len().cmp(&a.1.len()));
        docs.truncate(200);
    }

    let similar = similarity::pairwise_similar(&docs, threshold);

    // Filter to pairs in different communities
    similar.into_iter()
        .filter(|(a, b, _)| {
            let ca = communities.get(a);
            let cb = communities.get(b);
            match (ca, cb) {
                (Some(a), Some(b)) => a != b,
                _ => true, // if community unknown, flag it
            }
        })
        .collect()
}

/// Schema assimilation scoring for a new node.
/// Returns how easily the node integrates into existing structure.
///
/// High fit (>0.5): auto-link, done
/// Medium fit (0.2-0.5): agent reviews, proposes links
/// Low fit (<0.2): deep examination needed — new schema seed, bridge, or noise?
pub fn schema_assimilation(store: &Store, key: &str) -> (f32, &'static str) {
    let graph = store.build_graph();
    let fit = graph::schema_fit(&graph, key);

    let recommendation = if fit > 0.5 {
        "auto-integrate"
    } else if fit > 0.2 {
        "agent-review"
    } else if graph.degree(key) > 0 {
        "deep-examine-bridge"
    } else {
        "deep-examine-orphan"
    };

    (fit, recommendation)
}

/// Prompt template directory
fn prompts_dir() -> std::path::PathBuf {
    // Check for prompts relative to binary, then fall back to ~/poc/memory/prompts/
    let home = std::env::var("HOME").unwrap_or_default();
    std::path::PathBuf::from(home).join("poc/memory/prompts")
}

/// Load a prompt template, replacing {{PLACEHOLDER}} with data
fn load_prompt(name: &str, replacements: &[(&str, &str)]) -> Result<String, String> {
    let path = prompts_dir().join(format!("{}.md", name));
    let mut content = std::fs::read_to_string(&path)
        .map_err(|e| format!("load prompt {}: {}", path.display(), e))?;
    for (placeholder, data) in replacements {
        content = content.replace(placeholder, data);
    }
    Ok(content)
}

/// Format topology header for agent prompts — current graph health metrics
fn format_topology_header(graph: &Graph) -> String {
    let sigma = graph.small_world_sigma();
    let alpha = graph.degree_power_law_exponent();
    let gini = graph.degree_gini();
    let avg_cc = graph.avg_clustering_coefficient();
    let n = graph.nodes().len();
    let e = graph.edge_count();

    format!(
        "## Current graph topology\n\
         Nodes: {}  Edges: {}  Communities: {}\n\
         Small-world σ: {:.1}  Power-law α: {:.2}  Degree Gini: {:.3}\n\
         Avg clustering coefficient: {:.4}\n\n\
         Each node below shows its hub-link ratio (fraction of edges to top-5% degree nodes).\n\
         Use `poc-memory link-impact SOURCE TARGET` to evaluate proposed links.\n\n",
        n, e, graph.community_count(), sigma, alpha, gini, avg_cc)
}

/// Compute the hub degree threshold (top 5% by degree)
fn hub_threshold(graph: &Graph) -> usize {
    let mut degrees: Vec<usize> = graph.nodes().iter()
        .map(|k| graph.degree(k))
        .collect();
    degrees.sort_unstable();
    if degrees.len() >= 20 {
        degrees[degrees.len() * 95 / 100]
    } else {
        usize::MAX
    }
}

/// Format node data section for prompt templates
fn format_nodes_section(store: &Store, items: &[ReplayItem], graph: &Graph) -> String {
    let hub_thresh = hub_threshold(graph);
    let mut out = String::new();
    for item in items {
        let node = match store.nodes.get(&item.key) {
            Some(n) => n,
            None => continue,
        };

        out.push_str(&format!("## {} \n", item.key));
        out.push_str(&format!("Priority: {:.3}  Schema fit: {:.3}  Emotion: {:.1}  ",
            item.priority, item.schema_fit, item.emotion));
        out.push_str(&format!("Category: {}  Interval: {}d\n",
            node.category.label(), node.spaced_repetition_interval));

        if let Some(community) = node.community_id {
            out.push_str(&format!("Community: {}  ", community));
        }
        let deg = graph.degree(&item.key);
        let cc = graph.clustering_coefficient(&item.key);

        // Hub-link ratio: what fraction of this node's edges go to hubs?
        let neighbors = graph.neighbors(&item.key);
        let hub_links = neighbors.iter()
            .filter(|(n, _)| graph.degree(n) >= hub_thresh)
            .count();
        let hub_ratio = if deg > 0 { hub_links as f32 / deg as f32 } else { 0.0 };
        let is_hub = deg >= hub_thresh;

        out.push_str(&format!("Degree: {}  CC: {:.3}  Hub-link ratio: {:.0}% ({}/{})",
            deg, cc, hub_ratio * 100.0, hub_links, deg));
        if is_hub {
            out.push_str("  ← THIS IS A HUB");
        } else if hub_ratio > 0.6 {
            out.push_str("  ← mostly hub-connected, needs lateral links");
        }
        out.push('\n');

        // Content (truncated for large nodes)
        let content = &node.content;
        if content.len() > 1500 {
            let end = content.floor_char_boundary(1500);
            out.push_str(&format!("\nContent ({} chars, truncated):\n{}\n[...]\n\n",
                content.len(), &content[..end]));
        } else {
            out.push_str(&format!("\nContent:\n{}\n\n", content));
        }

        // Neighbors
        let neighbors = graph.neighbors(&item.key);
        if !neighbors.is_empty() {
            out.push_str("Neighbors:\n");
            for (n, strength) in neighbors.iter().take(15) {
                let n_cc = graph.clustering_coefficient(n);
                let n_community = store.nodes.get(n.as_str())
                    .and_then(|n| n.community_id);
                out.push_str(&format!("  - {} (str={:.2}, cc={:.3}",
                    n, strength, n_cc));
                if let Some(c) = n_community {
                    out.push_str(&format!(", c{}", c));
                }
                out.push_str(")\n");
            }
        }
        out.push_str("\n---\n\n");
    }
    out
}

/// Format health data for the health agent prompt
fn format_health_section(store: &Store, graph: &Graph) -> String {
    let health = graph::health_report(graph, store);

    let mut out = health;
    out.push_str("\n\n## Weight distribution\n");

    // Weight histogram
    let mut buckets = [0u32; 10]; // 0.0-0.1, 0.1-0.2, ..., 0.9-1.0
    for node in store.nodes.values() {
        let bucket = ((node.weight * 10.0) as usize).min(9);
        buckets[bucket] += 1;
    }
    for (i, &count) in buckets.iter().enumerate() {
        let lo = i as f32 / 10.0;
        let hi = (i + 1) as f32 / 10.0;
        let bar = "█".repeat((count as usize) / 10);
        out.push_str(&format!("  {:.1}-{:.1}: {:4} {}\n", lo, hi, count, bar));
    }

    // Near-prune nodes
    let near_prune: Vec<_> = store.nodes.iter()
        .filter(|(_, n)| n.weight < 0.15)
        .map(|(k, n)| (k.clone(), n.weight))
        .collect();
    if !near_prune.is_empty() {
        out.push_str(&format!("\n## Near-prune nodes ({} total)\n", near_prune.len()));
        for (k, w) in near_prune.iter().take(20) {
            out.push_str(&format!("  [{:.3}] {}\n", w, k));
        }
    }

    // Community sizes
    let communities = graph.communities();
    let mut comm_sizes: std::collections::HashMap<u32, Vec<String>> = std::collections::HashMap::new();
    for (key, &label) in communities {
        comm_sizes.entry(label).or_default().push(key.clone());
    }
    let mut sizes: Vec<_> = comm_sizes.iter()
        .map(|(id, members)| (*id, members.len(), members.clone()))
        .collect();
    sizes.sort_by(|a, b| b.1.cmp(&a.1));

    out.push_str("\n## Largest communities\n");
    for (id, size, members) in sizes.iter().take(10) {
        out.push_str(&format!("  Community {} ({} nodes): ", id, size));
        let sample: Vec<_> = members.iter().take(5).map(|s| s.as_str()).collect();
        out.push_str(&sample.join(", "));
        if *size > 5 { out.push_str(", ..."); }
        out.push('\n');
    }

    out
}

/// Format interference pairs for the separator agent prompt
fn format_pairs_section(
    pairs: &[(String, String, f32)],
    store: &Store,
    graph: &Graph,
) -> String {
    let mut out = String::new();
    let communities = graph.communities();

    for (a, b, sim) in pairs {
        out.push_str(&format!("## Pair: similarity={:.3}\n", sim));

        let ca = communities.get(a).map(|c| format!("c{}", c)).unwrap_or_else(|| "?".into());
        let cb = communities.get(b).map(|c| format!("c{}", c)).unwrap_or_else(|| "?".into());

        // Node A
        out.push_str(&format!("\n### {} ({})\n", a, ca));
        if let Some(node) = store.nodes.get(a) {
            let content = if node.content.len() > 500 {
                let end = node.content.floor_char_boundary(500);
                format!("{}...", &node.content[..end])
            } else {
                node.content.clone()
            };
            out.push_str(&format!("Category: {}  Weight: {:.2}\n{}\n",
                node.category.label(), node.weight, content));
        }

        // Node B
        out.push_str(&format!("\n### {} ({})\n", b, cb));
        if let Some(node) = store.nodes.get(b) {
            let content = if node.content.len() > 500 {
                let end = node.content.floor_char_boundary(500);
                format!("{}...", &node.content[..end])
            } else {
                node.content.clone()
            };
            out.push_str(&format!("Category: {}  Weight: {:.2}\n{}\n",
                node.category.label(), node.weight, content));
        }

        out.push_str("\n---\n\n");
    }
    out
}

/// Run agent consolidation on top-priority nodes
pub fn consolidation_batch(store: &Store, count: usize, auto: bool) -> Result<(), String> {
    let graph = store.build_graph();
    let items = replay_queue(store, count);

    if items.is_empty() {
        println!("No nodes to consolidate.");
        return Ok(());
    }

    let nodes_section = format_nodes_section(store, &items, &graph);

    if auto {
        // Generate the replay agent prompt with data filled in
        let prompt = load_prompt("replay", &[("{{NODES}}", &nodes_section)])?;
        println!("{}", prompt);
    } else {
        // Interactive: show what needs attention and available agent types
        println!("Consolidation batch ({} nodes):\n", items.len());
        for item in &items {
            let node_type = store.nodes.get(&item.key)
                .map(|n| if n.key.contains("journal") { "episodic" } else { "semantic" })
                .unwrap_or("?");
            println!("  [{:.3}] {} (fit={:.3}, interval={}d, type={})",
                item.priority, item.key, item.schema_fit, item.interval_days, node_type);
        }

        // Also show interference pairs
        let pairs = detect_interference(store, &graph, 0.6);
        if !pairs.is_empty() {
            println!("\nInterfering pairs ({}):", pairs.len());
            for (a, b, sim) in pairs.iter().take(5) {
                println!("  [{:.3}] {} ↔ {}", sim, a, b);
            }
        }

        println!("\nAgent prompts:");
        println!("  --auto              Generate replay agent prompt");
        println!("  --agent replay      Replay agent (schema assimilation)");
        println!("  --agent linker      Linker agent (relational binding)");
        println!("  --agent separator   Separator agent (pattern separation)");
        println!("  --agent transfer    Transfer agent (CLS episodic→semantic)");
        println!("  --agent health      Health agent (synaptic homeostasis)");
    }

    Ok(())
}

/// Generate a specific agent prompt with filled-in data
pub fn agent_prompt(store: &Store, agent: &str, count: usize) -> Result<String, String> {
    let graph = store.build_graph();
    let topology = format_topology_header(&graph);

    match agent {
        "replay" => {
            let items = replay_queue(store, count);
            let nodes_section = format_nodes_section(store, &items, &graph);
            load_prompt("replay", &[("{{TOPOLOGY}}", &topology), ("{{NODES}}", &nodes_section)])
        }
        "linker" => {
            // Filter to episodic entries
            let mut items = replay_queue(store, count * 2);
            items.retain(|item| {
                store.nodes.get(&item.key)
                    .map(|n| matches!(n.node_type, crate::capnp_store::NodeType::EpisodicSession))
                    .unwrap_or(false)
                    || item.key.contains("journal")
                    || item.key.contains("session")
            });
            items.truncate(count);
            let nodes_section = format_nodes_section(store, &items, &graph);
            load_prompt("linker", &[("{{TOPOLOGY}}", &topology), ("{{NODES}}", &nodes_section)])
        }
        "separator" => {
            let pairs = detect_interference(store, &graph, 0.5);
            let pairs_section = format_pairs_section(&pairs, store, &graph);
            load_prompt("separator", &[("{{TOPOLOGY}}", &topology), ("{{PAIRS}}", &pairs_section)])
        }
        "transfer" => {
            // Recent episodic entries
            let mut episodes: Vec<_> = store.nodes.iter()
                .filter(|(k, _)| k.contains("journal") || k.contains("session"))
                .map(|(k, n)| (k.clone(), n.timestamp))
                .collect();
            episodes.sort_by(|a, b| b.1.partial_cmp(&a.1).unwrap());
            episodes.truncate(count);

            let episode_keys: Vec<_> = episodes.iter().map(|(k, _)| k.clone()).collect();
            let items: Vec<ReplayItem> = episode_keys.iter()
                .filter_map(|k| {
                    let node = store.nodes.get(k)?;
                    let fit = graph::schema_fit(&graph, k);
                    Some(ReplayItem {
                        key: k.clone(),
                        priority: consolidation_priority(store, k, &graph),
                        interval_days: node.spaced_repetition_interval,
                        emotion: node.emotion,
                        schema_fit: fit,
                    })
                })
                .collect();
            let episodes_section = format_nodes_section(store, &items, &graph);
            load_prompt("transfer", &[("{{TOPOLOGY}}", &topology), ("{{EPISODES}}", &episodes_section)])
        }
        "health" => {
            let health_section = format_health_section(store, &graph);
            load_prompt("health", &[("{{TOPOLOGY}}", &topology), ("{{HEALTH}}", &health_section)])
        }
        _ => Err(format!("Unknown agent: {}. Use: replay, linker, separator, transfer, health", agent)),
    }
}

/// Agent allocation from the control loop
pub struct ConsolidationPlan {
    pub replay_count: usize,
    pub linker_count: usize,
    pub separator_count: usize,
    pub transfer_count: usize,
    pub run_health: bool,
    pub rationale: Vec<String>,
}

/// Analyze metrics and decide how much each agent needs to run.
///
/// This is the control loop: metrics → error signal → agent allocation.
/// Target values are based on healthy small-world networks.
pub fn consolidation_plan(store: &Store) -> ConsolidationPlan {
    let graph = store.build_graph();
    let alpha = graph.degree_power_law_exponent();
    let gini = graph.degree_gini();
    let avg_fit = {
        let fits = graph::schema_fit_all(&graph);
        if fits.is_empty() { 0.0 } else {
            fits.values().sum::<f32>() / fits.len() as f32
        }
    };
    let interference_pairs = detect_interference(store, &graph, 0.5);
    let interference_count = interference_pairs.len();

    // Count episodic vs semantic nodes
    let episodic_count = store.nodes.iter()
        .filter(|(k, _)| k.contains("journal") || k.contains("session"))
        .count();
    let _semantic_count = store.nodes.len() - episodic_count;
    let episodic_ratio = if store.nodes.is_empty() { 0.0 }
        else { episodic_count as f32 / store.nodes.len() as f32 };

    let mut plan = ConsolidationPlan {
        replay_count: 0,
        linker_count: 0,
        separator_count: 0,
        transfer_count: 0,
        run_health: true, // always run health first
        rationale: Vec::new(),
    };

    // Target: α ≥ 2.5 (healthy scale-free)
    // Current distance determines replay + linker allocation
    if alpha < 2.0 {
        plan.replay_count += 10;
        plan.linker_count += 5;
        plan.rationale.push(format!(
            "α={:.2} (target ≥2.5): extreme hub dominance → 10 replay + 5 linker for lateral links",
            alpha));
    } else if alpha < 2.5 {
        plan.replay_count += 5;
        plan.linker_count += 3;
        plan.rationale.push(format!(
            "α={:.2} (target ≥2.5): moderate hub dominance → 5 replay + 3 linker",
            alpha));
    } else {
        plan.replay_count += 3;
        plan.rationale.push(format!(
            "α={:.2}: healthy — 3 replay for maintenance", alpha));
    }

    // Target: Gini ≤ 0.4
    if gini > 0.5 {
        plan.replay_count += 3;
        plan.rationale.push(format!(
            "Gini={:.3} (target ≤0.4): high inequality → +3 replay (lateral focus)",
            gini));
    }

    // Target: avg schema fit ≥ 0.2
    if avg_fit < 0.1 {
        plan.replay_count += 5;
        plan.rationale.push(format!(
            "Schema fit={:.3} (target ≥0.2): very poor integration → +5 replay",
            avg_fit));
    } else if avg_fit < 0.2 {
        plan.replay_count += 2;
        plan.rationale.push(format!(
            "Schema fit={:.3} (target ≥0.2): low integration → +2 replay",
            avg_fit));
    }

    // Interference: >100 pairs is a lot, <10 is clean
    if interference_count > 100 {
        plan.separator_count += 10;
        plan.rationale.push(format!(
            "Interference: {} pairs (target <50) → 10 separator",
            interference_count));
    } else if interference_count > 20 {
        plan.separator_count += 5;
        plan.rationale.push(format!(
            "Interference: {} pairs (target <50) → 5 separator",
            interference_count));
    } else if interference_count > 0 {
        plan.separator_count += interference_count.min(3);
        plan.rationale.push(format!(
            "Interference: {} pairs → {} separator",
            interference_count, plan.separator_count));
    }

    // Episodic → semantic transfer
    // If >60% of nodes are episodic, knowledge isn't being extracted
    if episodic_ratio > 0.6 {
        plan.transfer_count += 10;
        plan.rationale.push(format!(
            "Episodic ratio: {:.0}% ({}/{}) → 10 transfer (knowledge extraction needed)",
            episodic_ratio * 100.0, episodic_count, store.nodes.len()));
    } else if episodic_ratio > 0.4 {
        plan.transfer_count += 5;
        plan.rationale.push(format!(
            "Episodic ratio: {:.0}% → 5 transfer",
            episodic_ratio * 100.0));
    }

    plan
}

/// Format the consolidation plan for display
pub fn format_plan(plan: &ConsolidationPlan) -> String {
    let mut out = String::from("Consolidation Plan\n==================\n\n");

    out.push_str("Analysis:\n");
    for r in &plan.rationale {
        out.push_str(&format!("  • {}\n", r));
    }

    out.push_str("\nAgent allocation:\n");
    if plan.run_health {
        out.push_str("  1. health        — system audit\n");
    }
    let mut step = 2;
    if plan.replay_count > 0 {
        out.push_str(&format!("  {}. replay ×{:2}    — schema assimilation + lateral linking\n",
            step, plan.replay_count));
        step += 1;
    }
    if plan.linker_count > 0 {
        out.push_str(&format!("  {}. linker ×{:2}    — relational binding from episodes\n",
            step, plan.linker_count));
        step += 1;
    }
    if plan.separator_count > 0 {
        out.push_str(&format!("  {}. separator ×{} — pattern separation\n",
            step, plan.separator_count));
        step += 1;
    }
    if plan.transfer_count > 0 {
        out.push_str(&format!("  {}. transfer ×{:2} — episodic→semantic extraction\n",
            step, plan.transfer_count));
    }

    let total = plan.replay_count + plan.linker_count
        + plan.separator_count + plan.transfer_count
        + if plan.run_health { 1 } else { 0 };
    out.push_str(&format!("\nTotal agent runs: {}\n", total));

    out
}

/// Brief daily check: compare current metrics to last snapshot
pub fn daily_check(store: &Store) -> String {
    let graph = store.build_graph();
    let alpha = graph.degree_power_law_exponent();
    let gini = graph.degree_gini();
    let sigma = graph.small_world_sigma();
    let avg_cc = graph.avg_clustering_coefficient();
    let avg_fit = {
        let fits = graph::schema_fit_all(&graph);
        if fits.is_empty() { 0.0 } else {
            fits.values().sum::<f32>() / fits.len() as f32
        }
    };

    let history = graph::load_metrics_history();
    let prev = history.last();

    let mut out = String::from("Memory daily check\n");

    // Current state
    out.push_str(&format!("  σ={:.1}  α={:.2}  gini={:.3}  cc={:.4}  fit={:.3}\n",
        sigma, alpha, gini, avg_cc, avg_fit));

    // Trend
    if let Some(p) = prev {
        let d_sigma = sigma - p.sigma;
        let d_alpha = alpha - p.alpha;
        let d_gini = gini - p.gini;

        out.push_str(&format!("  Δσ={:+.1}  Δα={:+.2}  Δgini={:+.3}\n",
            d_sigma, d_alpha, d_gini));

        // Assessment
        let mut issues = Vec::new();
        if alpha < 2.0 { issues.push("hub dominance critical"); }
        if gini > 0.5 { issues.push("high inequality"); }
        if avg_fit < 0.1 { issues.push("poor integration"); }
        if d_sigma < -5.0 { issues.push("σ declining"); }
        if d_alpha < -0.1 { issues.push("α declining"); }
        if d_gini > 0.02 { issues.push("inequality increasing"); }

        if issues.is_empty() {
            out.push_str("  Status: healthy\n");
        } else {
            out.push_str(&format!("  Status: needs attention — {}\n", issues.join(", ")));
            out.push_str("  Run: poc-memory consolidate-session\n");
        }
    } else {
        out.push_str("  (first snapshot, no trend data yet)\n");
    }

    // Log this snapshot too
    let now = crate::capnp_store::now_epoch();
    let date = crate::capnp_store::format_datetime_space(now);
    graph::save_metrics_snapshot(&graph::MetricsSnapshot {
        timestamp: now, date,
        nodes: graph.nodes().len(),
        edges: graph.edge_count(),
        communities: graph.community_count(),
        sigma, alpha, gini, avg_cc,
        avg_path_length: graph.avg_path_length(),
        avg_schema_fit: avg_fit,
    });

    out
}