sparrow-cli 0.5.0

use crate::engine::{Engine, Task};
use crate::event::Event;
use crate::memory::{Fact, Memory};
use std::sync::Arc;
use tokio::sync::mpsc;

// ─── Auto-distillation ─────────────────────────────────────────────────────────

/// After a successful run, extract durable facts about the user
/// from the conversation trajectory.
/// §3.8: "after sessions, distill durable facts/preferences into identity/facts_about_user"
pub struct Distiller;

impl Distiller {
    /// Analyze run events and extract facts
    pub async fn distill(memory: &Arc<dyn Memory>, events: &[Event], _task_description: &str) {
        let mut facts = Vec::new();

        // Extract user preferences from tools used
        let mut lang_hints = Vec::new();
        let mut framework_hints = Vec::new();
        let mut style_hints = Vec::new();

        for event in events {
            match event {
                Event::ToolUseProposed { args, .. } => {
                    if let Some(path) = args.get("path").and_then(|v| v.as_str()) {
                        if path.ends_with(".rs") {
                            lang_hints.push("Rust".to_string());
                        }
                        if path.ends_with(".ts") || path.ends_with(".tsx") {
                            lang_hints.push("TypeScript".to_string());
                        }
                        if path.ends_with(".py") {
                            lang_hints.push("Python".to_string());
                        }
                        if path.ends_with(".go") {
                            lang_hints.push("Go".to_string());
                        }
                        if path.ends_with(".js") || path.ends_with(".jsx") {
                            lang_hints.push("JavaScript".to_string());
                        }
                    }
                    if let Some(content) = args.get("content").and_then(|v| v.as_str()) {
                        if content.contains("Cargo.toml") {
                            framework_hints.push("Rust/Cargo".to_string());
                        }
                        if content.contains("package.json") {
                            framework_hints.push("Node.js".to_string());
                        }
                        if content.contains("go.mod") {
                            framework_hints.push("Go modules".to_string());
                        }
                    }
                }
                Event::ThinkingDelta { text, .. } => {
                    if text.contains("refactor") {
                        style_hints.push("prefers refactoring".to_string());
                    }
                    if text.contains("test") || text.contains("TDD") {
                        style_hints.push("test-driven".to_string());
                    }
                }
                _ => {}
            }
        }

        // Deduplicate and save facts
        lang_hints.sort();
        lang_hints.dedup();
        framework_hints.sort();
        framework_hints.dedup();
        style_hints.sort();
        style_hints.dedup();

        for lang in &lang_hints {
            facts.push(Fact {
                id: uuid::Uuid::new_v4().to_string(),
                key: "user:language".into(),
                value: lang.clone(),
                created_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
                updated_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
            });
        }
        for fw in &framework_hints {
            facts.push(Fact {
                id: uuid::Uuid::new_v4().to_string(),
                key: "user:framework".into(),
                value: fw.clone(),
                created_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
                updated_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
            });
        }
        for style in &style_hints {
            facts.push(Fact {
                id: uuid::Uuid::new_v4().to_string(),
                key: "user:style".into(),
                value: style.clone(),
                created_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
                updated_at: chrono::Utc::now().format("%Y-%m-%d").to_string(),
            });
        }

        // Save deduplicated facts
        let existing = memory.all_facts();
        let existing_keys: Vec<&str> = existing.iter().map(|f| f.key.as_str()).collect();

        for fact in facts {
            if !existing_keys.contains(&fact.key.as_str()) {
                let _ = memory.remember(fact);
            }
        }

        if !lang_hints.is_empty() || !framework_hints.is_empty() {
            tracing::info!(
                "Distiller: extracted {} facts from session",
                lang_hints.len() + framework_hints.len() + style_hints.len()
            );
        }
    }
}

// ─── Lightweight deterministic embeddings ──────────────────────────────────────

/// Lightweight semantic embeddings for repo memory.
/// §3.8: "optional embeddings (per project)"
#[derive(Debug, Clone)]
pub struct Embeddings {
    /// Stored text + normalized hashing-vector embedding.
    pub vectors: Vec<(String, Vec<f64>)>,
    dimensions: usize,
}

impl Embeddings {
    pub const DEFAULT_DIMENSIONS: usize = 512;

    pub fn new() -> Self {
        Self {
            vectors: Vec::new(),
            dimensions: Self::DEFAULT_DIMENSIONS,
        }
    }

    pub fn with_dimensions(dimensions: usize) -> Self {
        Self {
            vectors: Vec::new(),
            dimensions: dimensions.max(16),
        }
    }

    /// Build a deterministic hashing-vector embedding from text.
    ///
    /// This is intentionally local-first: no model/API key required, fixed
    /// dimensions across documents, stable across sessions, and good enough for
    /// lexical semantic recall in memory. It uses signed feature hashing with
    /// unigram + adjacent bigram features, sublinear term frequency, and L2
    /// normalization.
    pub fn embed(&self, text: &str) -> Vec<f64> {
        embed_with_dimensions(text, self.dimensions)
    }

    pub fn add(&mut self, text: &str) {
        let clean = text.trim();
        if clean.is_empty() {
            return;
        }
        self.vectors.push((clean.to_string(), self.embed(clean)));
    }

    pub fn add_many<I, S>(&mut self, texts: I)
    where
        I: IntoIterator<Item = S>,
        S: AsRef<str>,
    {
        for text in texts {
            self.add(text.as_ref());
        }
    }

    /// Find the most similar stored text to the query
    pub fn search(&self, query: &str, k: usize) -> Vec<String> {
        self.search_scored(query, k)
            .into_iter()
            .map(|(_, text)| text)
            .collect()
    }

    pub fn search_scored(&self, query: &str, k: usize) -> Vec<(f64, String)> {
        if k == 0 {
            return Vec::new();
        }
        let q_embed = self.embed(query);
        let mut scored: Vec<(f64, usize, &str)> = self
            .vectors
            .iter()
            .enumerate()
            .map(|(idx, (text, emb))| (cosine_sim(&q_embed, emb), idx, text.as_str()))
            .collect();
        scored.sort_by(|a, b| {
            b.0.partial_cmp(&a.0)
                .unwrap_or(std::cmp::Ordering::Equal)
                .then(a.1.cmp(&b.1))
        });
        scored
            .into_iter()
            .take(k)
            .filter(|(score, _, _)| *score > 0.0)
            .map(|(score, _, text)| (score, text.to_string()))
            .collect()
    }

    pub fn save_to_path(&self, path: impl AsRef<std::path::Path>) -> anyhow::Result<()> {
        let snapshot = EmbeddingsSnapshot {
            dimensions: self.dimensions,
            texts: self.vectors.iter().map(|(text, _)| text.clone()).collect(),
        };
        let json = serde_json::to_string_pretty(&snapshot)?;
        if let Some(parent) = path.as_ref().parent() {
            std::fs::create_dir_all(parent)?;
        }
        std::fs::write(path, json)?;
        Ok(())
    }

    pub fn load_from_path(path: impl AsRef<std::path::Path>) -> anyhow::Result<Self> {
        let json = std::fs::read_to_string(path)?;
        let snapshot: EmbeddingsSnapshot = serde_json::from_str(&json)?;
        let mut index = Self::with_dimensions(snapshot.dimensions);
        index.add_many(snapshot.texts);
        Ok(index)
    }
}

impl Default for Embeddings {
    fn default() -> Self {
        Self::new()
    }
}

#[derive(serde::Serialize, serde::Deserialize)]
struct EmbeddingsSnapshot {
    dimensions: usize,
    texts: Vec<String>,
}

fn embed_with_dimensions(text: &str, dimensions: usize) -> Vec<f64> {
    let mut vector = vec![0.0; dimensions.max(16)];
    let tokens = tokenize(text);
    for token in &tokens {
        add_feature(&mut vector, token, 1.0);
    }
    for pair in tokens.windows(2) {
        add_feature(&mut vector, &format!("{}__{}", pair[0], pair[1]), 1.35);
    }
    for value in &mut vector {
        if *value != 0.0 {
            *value = value.signum() * value.abs().ln_1p();
        }
    }
    normalize(&mut vector);
    vector
}

fn tokenize(text: &str) -> Vec<String> {
    let mut tokens = Vec::new();
    let mut current = String::new();
    for ch in text.chars() {
        if ch.is_alphanumeric() {
            current.extend(ch.to_lowercase());
        } else if !current.is_empty() {
            tokens.push(std::mem::take(&mut current));
        }
    }
    if !current.is_empty() {
        tokens.push(current);
    }
    tokens
}

fn add_feature(vector: &mut [f64], feature: &str, weight: f64) {
    let hash = fnv1a64(feature.as_bytes());
    let idx = (hash as usize) % vector.len();
    let sign = if hash & (1 << 63) == 0 { 1.0 } else { -1.0 };
    vector[idx] += sign * weight;
}

fn fnv1a64(bytes: &[u8]) -> u64 {
    let mut hash = 0xcbf29ce484222325u64;
    for byte in bytes {
        hash ^= *byte as u64;
        hash = hash.wrapping_mul(0x100000001b3);
    }
    hash
}

fn normalize(vector: &mut [f64]) {
    let norm = vector.iter().map(|v| v * v).sum::<f64>().sqrt();
    if norm > 0.0 {
        for value in vector {
            *value /= norm;
        }
    }
}

fn cosine_sim(a: &[f64], b: &[f64]) -> f64 {
    let len = a.len().min(b.len());
    if len == 0 {
        return 0.0;
    }
    let dot: f64 = a.iter().zip(b.iter()).take(len).map(|(x, y)| x * y).sum();
    let norm_a: f64 = a.iter().take(len).map(|x| x * x).sum::<f64>().sqrt();
    let norm_b: f64 = b.iter().take(len).map(|x| x * x).sum::<f64>().sqrt();
    if norm_a == 0.0 || norm_b == 0.0 {
        0.0
    } else {
        dot / (norm_a * norm_b)
    }
}

// ─── Replay re-execute ──────────────────────────────────────────────────────────

/// Re-execute a transcript against a chosen model.
/// §3.15: "can re-execute against a chosen model"
pub struct ReExecuter {
    engine: Arc<Engine>,
}

impl ReExecuter {
    pub fn new(engine: Arc<Engine>) -> Self {
        Self { engine }
    }

    /// Re-execute from a transcript: send the original task to the engine
    /// with the same parameters.
    pub async fn re_execute(
        &self,
        transcript: &crate::runtime::recorder::Transcript,
    ) -> anyhow::Result<crate::event::OutcomeSummary> {
        let (tx, _rx) = mpsc::unbounded_channel::<Event>();
        let task = Task {
            description: transcript.inputs.task.clone(),
            context: vec![],
        };
        self.engine.drive(task, tx).await
    }
}

// ─── OAuth flow ─────────────────────────────────────────────────────────────────

pub struct OAuthFlow;

impl OAuthFlow {
    /// Start a device code OAuth flow.
    /// Accepts the endpoints and scope from the provider registry — no hardcoded list.
    pub async fn start_device_flow(
        device_endpoint: &str,
        token_endpoint_hint: &str, // unused here, kept for symmetry
        client_id: &str,
        scope: &str,
    ) -> anyhow::Result<(String, String, String)> {
        let _ = token_endpoint_hint;
        let client = reqwest::Client::new();
        let resp: serde_json::Value = client
            .post(device_endpoint)
            .form(&[("client_id", client_id), ("scope", scope)])
            .send()
            .await?
            .json()
            .await?;

        let verification_uri = resp["verification_uri"]
            .as_str()
            .or_else(|| resp["verification_url"].as_str())
            .unwrap_or("")
            .to_string();
        let user_code = resp["user_code"].as_str().unwrap_or("").to_string();
        let device_code = resp["device_code"].as_str().unwrap_or("").to_string();

        if device_code.is_empty() {
            anyhow::bail!("Device flow start failed — provider response: {}", resp);
        }

        Ok((verification_uri, user_code, device_code))
    }

    /// Poll for token completion using the provider token endpoint.
    pub async fn poll_token(
        token_endpoint: &str,
        client_id: &str,
        device_code: &str,
        timeout_secs: u64,
    ) -> anyhow::Result<String> {
        let client = reqwest::Client::new();
        let start = std::time::Instant::now();

        loop {
            if start.elapsed().as_secs() > timeout_secs {
                anyhow::bail!("OAuth timed out after {}s", timeout_secs);
            }

            let resp: serde_json::Value = client
                .post(token_endpoint)
                .form(&[
                    ("client_id", client_id),
                    ("device_code", device_code),
                    ("grant_type", "urn:ietf:params:oauth:grant-type:device_code"),
                ])
                .send()
                .await?
                .json()
                .await?;

            if let Some(token) = resp["access_token"].as_str() {
                return Ok(token.to_string());
            }

            match resp["error"].as_str() {
                Some("authorization_pending") | Some("slow_down") => {
                    tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
                    continue;
                }
                Some(e) => anyhow::bail!("OAuth error: {}", e),
                None => {
                    tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
                }
            }
        }
    }
}

// ─── IBM Plex Mono reference ────────────────────────────────────────────────────

/// §9.3: "IBM Plex Mono everywhere (TUI authenticity + web)"
/// The font is not embedded in the binary; users install it system-wide.
/// This constant provides the download URL and instructions.
pub const IBM_PLEX_MONO_URL: &str =
    "https://github.com/IBM/plex/releases/latest/download/IBM-Plex-Mono.zip";

pub fn ibm_plex_install_instructions() -> String {
    r#"IBM Plex Mono — recommended font for Sparrow TUI.

Install:
  Linux:   sudo apt install fonts-ibm-plex
  macOS:   brew install font-ibm-plex
  Windows: Download from https://github.com/IBM/plex/releases

Then update your terminal to use "IBM Plex Mono" as the font.
"#
    .to_string()
}

// ─── Chat mode ──────────────────────────────────────────────────────────────────

/// Interactive multi-turn chat loop.
/// §4: "sparrow chat — interactive multi-turn (TUI/inline)"
pub struct ChatSession {
    engine: Arc<Engine>,
    history: Vec<crate::provider::Msg>,
    running: bool,
}

impl ChatSession {
    pub fn new(engine: Arc<Engine>) -> Self {
        Self {
            engine,
            history: Vec::new(),
            running: true,
        }
    }

    pub async fn run_interactive(&mut self) -> anyhow::Result<()> {
        use std::io::{self, Write};

        println!("═══ Sparrow Chat ═══");
        println!("Type your message and press Enter. Type /exit to quit.");
        println!();

        while self.running {
            print!("◆ you › ");
            io::stdout().flush()?;

            let mut input = String::new();
            io::stdin().read_line(&mut input)?;
            let input = input.trim().to_string();

            if input.is_empty() {
                continue;
            }
            if input == "/exit" || input == "/quit" {
                break;
            }

            self.history.push(crate::provider::Msg {
                role: "user".into(),
                content: vec![crate::provider::ContentBlock::Text {
                    text: input.clone(),
                }],
            });

            let (tx, mut rx) = mpsc::unbounded_channel::<Event>();
            let task = Task {
                description: input.clone(),
                context: self.history.clone(),
            };

            let engine = self.engine.clone();
            let handle = tokio::spawn(async move { engine.drive(task, tx).await });

            while let Some(event) = rx.recv().await {
                match &event {
                    Event::ThinkingDelta { text, .. } => {
                        print!("{}", text);
                        io::stdout().flush()?;
                    }
                    Event::RunFinished { outcome, .. } => {
                        println!("\n── {} | ${:.4} ──", outcome.status, outcome.cost_usd);
                    }
                    Event::Error { message, .. } => {
                        eprintln!("\nError: {}", message);
                    }
                    _ => {}
                }
            }

            match handle.await? {
                Ok(outcome) => {
                    self.history.push(crate::provider::Msg {
                        role: "assistant".into(),
                        content: vec![crate::provider::ContentBlock::Text {
                            text: format!("[{}]", outcome.status),
                        }],
                    });
                }
                Err(e) => {
                    eprintln!("Chat error: {}", e);
                }
            }
            println!();
        }

        Ok(())
    }
}

// ─── Configurable pipeline ──────────────────────────────────────────────────────

/// Allow users to define custom swarm pipeline graphs.
/// §3.11: "Configurable: number of agents, which model per role, pipeline graph."
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct PipelineConfig {
    pub name: String,
    pub steps: Vec<PipelineStep>,
    pub max_reworks: u32,
}

#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct PipelineStep {
    pub role: String,
    pub model_preference: Option<String>,
    pub prompt_override: Option<String>,
    pub depends_on: Vec<String>,
}

impl PipelineConfig {
    pub fn default_pipeline() -> Self {
        Self {
            name: "planner-coder-verifier".into(),
            steps: vec![
                PipelineStep {
                    role: "planner".into(),
                    model_preference: None,
                    prompt_override: None,
                    depends_on: vec![],
                },
                PipelineStep {
                    role: "coder".into(),
                    model_preference: None,
                    prompt_override: None,
                    depends_on: vec!["planner".into()],
                },
                PipelineStep {
                    role: "verifier".into(),
                    model_preference: None,
                    prompt_override: None,
                    depends_on: vec!["coder".into()],
                },
            ],
            max_reworks: 3,
        }
    }

    pub fn validate(&self) -> anyhow::Result<()> {
        if self.steps.is_empty() {
            anyhow::bail!("Pipeline must have at least one step");
        }
        for step in &self.steps {
            for dep in &step.depends_on {
                if !self.steps.iter().any(|s| s.role == *dep) {
                    anyhow::bail!("Step '{}' depends on unknown role '{}'", step.role, dep);
                }
            }
        }
        Ok(())
    }

    pub fn from_toml(content: &str) -> anyhow::Result<Self> {
        Ok(toml::from_str(content)?)
    }

    pub fn to_toml(&self) -> anyhow::Result<String> {
        Ok(toml::to_string_pretty(self)?)
    }
}

// ─── Profile isolation ──────────────────────────────────────────────────────────

/// Full profile isolation: separate config, memory, agents per profile.
/// §4: "sparrow profile <create|list|use> — multi-instance profiles"
pub struct Profile {
    pub name: String,
    pub config_dir: std::path::PathBuf,
    pub state_dir: std::path::PathBuf,
    pub config: crate::config::Config,
    pub memory: Arc<dyn Memory>,
}

impl Profile {
    pub fn load(name: &str) -> anyhow::Result<Self> {
        let base_config = dirs::config_dir().unwrap_or_default().join("sparrow");
        let base_state = dirs::state_dir().unwrap_or_default().join("sparrow");

        let config_dir = base_config.join("profiles").join(name);
        let state_dir = base_state.join("profiles").join(name);

        std::fs::create_dir_all(&config_dir)?;
        std::fs::create_dir_all(&state_dir)?;

        let config = if config_dir.join("config.toml").exists() {
            let content = std::fs::read_to_string(config_dir.join("config.toml"))?;
            toml::from_str(&content)?
        } else {
            // Inherit from default config if available
            let default = base_config.join("config.toml");
            if default.exists() {
                let content = std::fs::read_to_string(&default)?;
                toml::from_str(&content)?
            } else {
                crate::config::Config {
                    defaults: Default::default(),
                    routing: Default::default(),
                    budget: Default::default(),
                    providers: Default::default(),
                    surfaces: Default::default(),
                    skills: Default::default(),
                    permissions: Default::default(),
                    hooks: Default::default(),
                    theme: "captain".into(),
                    config_dir: config_dir.clone(),
                    state_dir: state_dir.clone(),
                    forced_model: None,
                }
            }
        };

        let memory: Arc<dyn Memory> = Arc::new(crate::memory::SqliteMemory::open(
            &state_dir.join("profile.db"),
        )?);

        Ok(Self {
            name: name.to_string(),
            config_dir,
            state_dir,
            config,
            memory,
        })
    }

    pub fn create(name: &str) -> anyhow::Result<()> {
        let base_config = dirs::config_dir().unwrap_or_default().join("sparrow");
        let config_dir = base_config.join("profiles").join(name);
        std::fs::create_dir_all(&config_dir)?;

        // Copy default config
        let default = base_config.join("config.toml");
        if default.exists() {
            std::fs::copy(&default, config_dir.join("config.toml"))?;
        }

        let base_state = dirs::state_dir().unwrap_or_default().join("sparrow");
        std::fs::create_dir_all(base_state.join("profiles").join(name))?;

        Ok(())
    }

    pub fn list() -> Vec<String> {
        let base_config = dirs::config_dir().unwrap_or_default().join("sparrow");
        let profiles_dir = base_config.join("profiles");
        let mut names = Vec::new();
        if let Ok(entries) = std::fs::read_dir(&profiles_dir) {
            for entry in entries.flatten() {
                if entry.path().is_dir() {
                    if let Some(name) = entry.file_name().to_str() {
                        names.push(name.to_string());
                    }
                }
            }
        }
        names.sort();
        names
    }
}