//! Semantic knowledge search + fact formatting/salience helpers.
//! Split out of `ctx_knowledge/mod.rs`; `use super::*` re-imports parent items.

#[allow(clippy::wildcard_imports)]
use super::*;
pub(crate) fn handle_search(query: Option<&str>) -> String {
    let Some(q) = query else {
        return "Error: query is required for search".to_string();
    };

    let Ok(data_dir) = crate::core::data_dir::lean_ctx_data_dir() else {
        return "Cannot determine data directory.".to_string();
    };

    let sessions_dir = data_dir.join("sessions");

    if !sessions_dir.exists() {
        return "No sessions found.".to_string();
    }

    let knowledge_dir = data_dir.join("knowledge");

    let allow_cross_project = {
        let role = crate::core::roles::active_role();
        role.io.allow_cross_project_search
    };

    let current_project_hash = std::env::current_dir()
        .ok()
        .map(|p| crate::core::project_hash::hash_project_root(&p.to_string_lossy()));

    let q_lower = q.to_lowercase();
    let terms: Vec<&str> = q_lower.split_whitespace().collect();
    let mut results = Vec::new();

    if knowledge_dir.exists() {
        if let Ok(entries) = std::fs::read_dir(&knowledge_dir) {
            for entry in entries.flatten() {
                let dir_name = entry.file_name().to_string_lossy().to_string();

                if !allow_cross_project {
                    if let Some(ref current_hash) = current_project_hash {
                        if &dir_name != current_hash {
                            continue;
                        }
                    }
                }

                if let Some(ref current_hash) = current_project_hash {
                    if dir_name != *current_hash {
                        let policy = crate::core::config::Config::load().boundary_policy;
                        let allowed = crate::core::memory_boundary::check_boundary(
                            current_hash,
                            &dir_name,
                            &policy,
                            &crate::core::memory_boundary::CrossProjectEventType::Search,
                        );
                        crate::core::memory_boundary::record_audit_event(
                            &crate::core::memory_boundary::CrossProjectAuditEvent {
                                timestamp: Utc::now().to_rfc3339(),
                                event_type:
                                    crate::core::memory_boundary::CrossProjectEventType::Search,
                                source_project_hash: current_hash.clone(),
                                target_project_hash: dir_name.clone(),
                                tool: "ctx_knowledge".to_string(),
                                action: "search".to_string(),
                                facts_accessed: 0,
                                allowed,
                                policy_reason: if allowed {
                                    "boundary_policy_allowed".to_string()
                                } else {
                                    "boundary_policy_denied".to_string()
                                },
                            },
                        );
                        if !allowed {
                            continue;
                        }
                    }
                }

                let knowledge_file = entry.path().join("knowledge.json");
                if let Ok(content) = std::fs::read_to_string(&knowledge_file) {
                    if let Ok(knowledge) = serde_json::from_str::<ProjectKnowledge>(&content) {
                        let is_foreign = current_project_hash
                            .as_ref()
                            .is_some_and(|h| h != &knowledge.project_hash);

                        for fact in &knowledge.facts {
                            if is_foreign
                                && fact.privacy
                                    == crate::core::memory_boundary::FactPrivacy::ProjectOnly
                            {
                                continue;
                            }

                            let searchable = format!(
                                "{} {} {}",
                                fact.category.to_lowercase(),
                                fact.key.to_lowercase(),
                                fact.value.to_lowercase()
                            );
                            let match_count =
                                terms.iter().filter(|t| searchable.contains(**t)).count();
                            if match_count > 0 {
                                results.push((
                                    knowledge.project_root.clone(),
                                    fact.category.clone(),
                                    fact.key.clone(),
                                    fact.value.clone(),
                                    fact.confidence,
                                    match_count as f32 / terms.len() as f32,
                                ));
                            }
                        }
                    }
                }
            }
        }
    }

    if let Ok(entries) = std::fs::read_dir(&sessions_dir) {
        for entry in entries.flatten() {
            let path = entry.path();
            if path.extension().and_then(|e| e.to_str()) != Some("json") {
                continue;
            }
            if path.file_name().and_then(|n| n.to_str()) == Some("latest.json") {
                continue;
            }
            if let Ok(json) = std::fs::read_to_string(&path) {
                if let Ok(session) = serde_json::from_str::<SessionState>(&json) {
                    for finding in &session.findings {
                        let searchable = finding.summary.to_lowercase();
                        let match_count = terms.iter().filter(|t| searchable.contains(**t)).count();
                        if match_count > 0 {
                            let project = session
                                .project_root
                                .clone()
                                .unwrap_or_else(|| "unknown".to_string());
                            results.push((
                                project,
                                "session-finding".to_string(),
                                session.id.clone(),
                                finding.summary.clone(),
                                0.6,
                                match_count as f32 / terms.len() as f32,
                            ));
                        }
                    }
                    for decision in &session.decisions {
                        let searchable = decision.summary.to_lowercase();
                        let match_count = terms.iter().filter(|t| searchable.contains(**t)).count();
                        if match_count > 0 {
                            let project = session
                                .project_root
                                .clone()
                                .unwrap_or_else(|| "unknown".to_string());
                            results.push((
                                project,
                                "session-decision".to_string(),
                                session.id.clone(),
                                decision.summary.clone(),
                                0.7,
                                match_count as f32 / terms.len() as f32,
                            ));
                        }
                    }
                }
            }
        }
    }

    if results.is_empty() {
        return format!("No results found for '{q}' across all sessions and projects.");
    }

    results.sort_by(|a, b| {
        b.5.partial_cmp(&a.5)
            .unwrap_or(std::cmp::Ordering::Equal)
            .then_with(|| b.4.partial_cmp(&a.4).unwrap_or(std::cmp::Ordering::Equal))
            .then_with(|| a.0.cmp(&b.0))
            .then_with(|| a.1.cmp(&b.1))
            .then_with(|| a.2.cmp(&b.2))
            .then_with(|| a.3.cmp(&b.3))
    });
    results.truncate(crate::core::budgets::KNOWLEDGE_CROSS_PROJECT_SEARCH_LIMIT);

    let mut out = format!("Cross-session search '{q}' ({} results):\n", results.len());
    for (project, cat, key, value, conf, _relevance) in &results {
        let project_short = short_path(project);
        out.push_str(&format!(
            "  [{cat}/{key}] {value} (project: {project_short}, conf: {:.0}%)\n",
            conf * 100.0
        ));
    }
    out
}

#[cfg(feature = "embeddings")]
pub(crate) struct SemanticHit {
    pub(crate) category: String,
    pub(crate) key: String,
    pub(crate) value: String,
    pub(crate) score: f32,
    pub(crate) semantic_score: f32,
    pub(crate) confidence_score: f32,
}

#[cfg(feature = "embeddings")]
pub(crate) fn apply_retrieval_signals_from_hits(
    knowledge: &mut ProjectKnowledge,
    hits: &[SemanticHit],
) {
    let now = Utc::now();
    for s in hits {
        for f in &mut knowledge.facts {
            if !f.is_current() {
                continue;
            }
            if f.category == s.category && f.key == s.key {
                f.retrieval_count = f.retrieval_count.saturating_add(1);
                f.last_retrieved = Some(now);
                break;
            }
        }
    }
}

#[cfg(feature = "embeddings")]
pub(crate) fn format_semantic_facts(query: &str, hits: &[SemanticHit]) -> String {
    if hits.is_empty() {
        return format!("No facts matching '{query}'.");
    }
    let mut out = format!("Semantic recall '{query}' (showing {}):\n", hits.len());
    for s in hits {
        out.push_str(&format!(
            "  [{}/{}]: {} (score: {:.0}%, sem: {:.0}%, conf: {:.0}%)\n",
            s.category,
            s.key,
            s.value,
            s.score * 100.0,
            s.semantic_score * 100.0,
            s.confidence_score * 100.0
        ));
    }
    out
}

pub(crate) fn format_facts_with_annotations(
    facts: &[crate::core::knowledge::KnowledgeFact],
    total: usize,
    category: Option<&str>,
    judged_pairs: &[crate::core::knowledge::JudgedPair],
) -> String {
    let mut facts: Vec<&crate::core::knowledge::KnowledgeFact> = facts.iter().collect();
    facts.sort_by(|a, b| sort_fact_for_output(a, b));

    let mut out = String::new();
    if let Some(cat) = category {
        out.push_str(&format!(
            "Facts [{cat}] (showing {}/{}):\n",
            facts.len(),
            total
        ));
    } else {
        out.push_str(&format!(
            "Matching facts (showing {}/{}):\n",
            facts.len(),
            total
        ));
    }
    for f in facts {
        let temporal = if f.is_current() { "" } else { " [archived]" };
        let rev = if f.revision_count > 1 {
            format!(" rev {}", f.revision_count)
        } else {
            String::new()
        };
        out.push_str(&format!(
            "  [{}/{}]: {} (quality: {:.0}%, confidence: {:.0}%, confirmed: {} x{}){rev}{temporal}\n",
            f.category,
            f.key,
            f.value,
            f.quality_score() * 100.0,
            f.confidence * 100.0,
            f.last_confirmed.format("%Y-%m-%d"),
            f.confirmation_count
        ));

        if !judged_pairs.is_empty() {
            let composite = format!("{}/{}", f.category, f.key);
            for jp in judged_pairs {
                if jp.key_a == composite {
                    out.push_str(&format!("    ↳ {} {}\n", jp.verdict, jp.key_b));
                } else if jp.key_b == composite && jp.verdict == "supersedes" {
                    out.push_str(&format!("    ↳ superseded by {}\n", jp.key_a));
                }
            }
        }
    }
    out
}

pub(crate) fn short_path(path: &str) -> String {
    let parts: Vec<&str> = path.split('/').collect();
    if parts.len() <= 2 {
        return path.to_string();
    }
    parts[parts.len() - 2..].join("/")
}

pub(crate) fn short_hash(hash: &str) -> &str {
    if hash.len() > 8 {
        &hash[..8]
    } else {
        hash
    }
}

pub(crate) fn sort_fact_for_output(
    a: &crate::core::knowledge::KnowledgeFact,
    b: &crate::core::knowledge::KnowledgeFact,
) -> std::cmp::Ordering {
    salience_score(b)
        .cmp(&salience_score(a))
        .then_with(|| {
            b.quality_score()
                .partial_cmp(&a.quality_score())
                .unwrap_or(std::cmp::Ordering::Equal)
        })
        .then_with(|| {
            b.confidence
                .partial_cmp(&a.confidence)
                .unwrap_or(std::cmp::Ordering::Equal)
        })
        .then_with(|| b.confirmation_count.cmp(&a.confirmation_count))
        .then_with(|| b.retrieval_count.cmp(&a.retrieval_count))
        .then_with(|| b.last_retrieved.cmp(&a.last_retrieved))
        .then_with(|| b.last_confirmed.cmp(&a.last_confirmed))
        .then_with(|| a.category.cmp(&b.category))
        .then_with(|| a.key.cmp(&b.key))
        .then_with(|| a.value.cmp(&b.value))
}

pub(crate) fn salience_score(f: &crate::core::knowledge::KnowledgeFact) -> u32 {
    let cat = f.category.to_lowercase();
    let base: u32 = match cat.as_str() {
        "decision" => 70,
        "gotcha" => 75,
        "architecture" | "arch" => 60,
        "security" => 65,
        "testing" | "tests" | "deployment" | "deploy" => 55,
        "conventions" | "convention" => 45,
        "finding" => 40,
        _ => 30,
    };

    let quality_bonus = (f.quality_score() * 60.0) as u32;
    let recency_bonus = f.last_retrieved.map_or(0u32, |t| {
        let days = chrono::Utc::now().signed_duration_since(t).num_days();
        if days <= 7 {
            10u32
        } else if days <= 30 {
            5u32
        } else {
            0u32
        }
    });

    base + quality_bonus + recency_bonus
}
