heroforge-core 0.2.2

//! Heroforge sync client implementation.
//!
//! This module provides a sync protocol client that can be used for
//! file-based testing. For production use, use the QUIC sync via
//! the `sync-quic` feature.

use super::protocol::{Card, Message};
use crate::artifact::blob;
use crate::error::{FossilError, Result};
use crate::hash;
use crate::repo::Repository;
use std::collections::HashSet;

/// A sync client for communicating with a Heroforge server.
pub struct SyncClient<'a> {
    repo: &'a Repository,
    url: String,
    projectcode: String,
    servercode: String,
    cookie: Option<String>,
    phantoms: HashSet<String>,
    received_artifacts: usize,
    sent_artifacts: usize,
}

impl<'a> SyncClient<'a> {
    /// Create a new sync client.
    ///
    /// # Arguments
    ///
    /// * `repo` - The local repository
    /// * `url` - URL of the remote Heroforge server
    pub fn new(repo: &'a Repository, url: &str) -> Result<Self> {
        let projectcode = repo.project_code()?;
        let servercode = hash::sha3_256_hex(uuid::Uuid::new_v4().to_string().as_bytes());

        Ok(Self {
            repo,
            url: url.trim_end_matches('/').to_string(),
            projectcode,
            servercode,
            cookie: None,
            phantoms: HashSet::new(),
            received_artifacts: 0,
            sent_artifacts: 0,
        })
    }

    /// Pull artifacts from the remote server.
    pub fn pull(&mut self, username: &str, password: &str) -> Result<SyncStats> {
        let mut total_received = 0;
        let mut rounds = 0;

        loop {
            rounds += 1;
            let response = self.pull_round(username, password)?;

            let received_this_round = response
                .cards
                .iter()
                .filter(|c| matches!(c, Card::File { .. } | Card::CFile { .. }))
                .count();

            total_received += received_this_round;

            for card in &response.cards {
                if let Card::Error { message } = card {
                    return Err(FossilError::SyncError(message.clone()));
                }
            }

            let mut new_phantoms = 0;
            for card in &response.cards {
                if let Card::Igot {
                    artifact_id,
                    is_private,
                } = card
                {
                    if !*is_private && !self.has_artifact(artifact_id)? {
                        self.phantoms.insert(artifact_id.clone());
                        new_phantoms += 1;
                    }
                }
            }

            if new_phantoms == 0 && received_this_round == 0 {
                break;
            }

            if rounds > 100 {
                return Err(FossilError::SyncError("Too many sync rounds".to_string()));
            }
        }

        Ok(SyncStats {
            received: total_received,
            sent: 0,
            rounds,
        })
    }

    fn pull_round(&mut self, username: &str, password: &str) -> Result<Message> {
        let mut request = Message::new();
        let mut payload = Message::new();

        payload.add(Card::Pragma {
            name: "client-version".to_string(),
            values: vec!["25000".to_string()],
        });

        payload.add(Card::Pull {
            servercode: self.servercode.clone(),
            projectcode: self.projectcode.clone(),
        });

        if let Some(ref cookie) = self.cookie {
            payload.add(Card::Cookie {
                payload: cookie.clone(),
            });
        }

        for phantom in self.phantoms.iter().take(200) {
            payload.add(Card::Gimme {
                artifact_id: phantom.clone(),
            });
        }

        let payload_text = payload.to_text()?;
        request.add(Message::create_login(username, password, &payload_text));

        for card in payload.cards {
            request.add(card);
        }

        let response = self.send_request(&request)?;

        for card in &response.cards {
            match card {
                Card::File {
                    artifact_id,
                    delta_source,
                    content,
                } => {
                    self.store_artifact(artifact_id, delta_source.as_deref(), content, false)?;
                    self.phantoms.remove(artifact_id);
                    self.received_artifacts += 1;
                }
                Card::CFile {
                    artifact_id,
                    delta_source,
                    content,
                    ..
                } => {
                    self.store_artifact(artifact_id, delta_source.as_deref(), content, true)?;
                    self.phantoms.remove(artifact_id);
                    self.received_artifacts += 1;
                }
                Card::Cookie { payload } => {
                    self.cookie = Some(payload.clone());
                }
                _ => {}
            }
        }

        Ok(response)
    }

    /// Push artifacts to the remote server.
    pub fn push(&mut self, username: &str, password: &str) -> Result<SyncStats> {
        let mut total_sent = 0;
        let mut rounds = 0;
        let mut gimme_queue: HashSet<String> = HashSet::new();

        let unclustered = self.get_unclustered_artifacts()?;

        loop {
            rounds += 1;
            let (response, sent_this_round) =
                self.push_round(username, password, &unclustered, &gimme_queue)?;

            total_sent += sent_this_round;

            for card in &response.cards {
                if let Card::Error { message } = card {
                    return Err(FossilError::SyncError(message.clone()));
                }
            }

            gimme_queue.clear();
            for card in &response.cards {
                if let Card::Gimme { artifact_id } = card {
                    gimme_queue.insert(artifact_id.clone());
                }
            }

            if gimme_queue.is_empty() && sent_this_round == 0 {
                break;
            }

            if rounds > 100 {
                return Err(FossilError::SyncError("Too many sync rounds".to_string()));
            }
        }

        Ok(SyncStats {
            received: 0,
            sent: total_sent,
            rounds,
        })
    }

    fn push_round(
        &mut self,
        username: &str,
        password: &str,
        unclustered: &[String],
        gimme_queue: &HashSet<String>,
    ) -> Result<(Message, usize)> {
        let mut request = Message::new();
        let mut sent_count = 0;

        let mut payload = Message::new();

        payload.add(Card::Pragma {
            name: "client-version".to_string(),
            values: vec!["25000".to_string()],
        });

        payload.add(Card::Push {
            servercode: self.servercode.clone(),
            projectcode: self.projectcode.clone(),
        });

        if let Some(ref cookie) = self.cookie {
            payload.add(Card::Cookie {
                payload: cookie.clone(),
            });
        }

        let mut total_size = 0;
        let max_size = 1024 * 1024;

        for artifact_id in gimme_queue {
            if total_size > max_size {
                break;
            }

            if let Ok(content) = self.get_artifact_content(artifact_id) {
                payload.add(Card::File {
                    artifact_id: artifact_id.clone(),
                    delta_source: None,
                    content: content.clone(),
                });
                total_size += content.len();
                sent_count += 1;
            }
        }

        for artifact_id in unclustered.iter().take(500) {
            payload.add(Card::Igot {
                artifact_id: artifact_id.clone(),
                is_private: false,
            });
        }

        let payload_text = payload.to_text()?;

        request.add(Message::create_login(username, password, &payload_text));

        for card in payload.cards {
            request.add(card);
        }

        let response = self.send_request(&request)?;

        for card in &response.cards {
            if let Card::Cookie { payload } = card {
                self.cookie = Some(payload.clone());
            }
        }

        self.sent_artifacts += sent_count;

        Ok((response, sent_count))
    }

    /// Sync (push and pull).
    pub fn sync(&mut self, username: &str, password: &str) -> Result<SyncStats> {
        let pull_stats = self.pull(username, password)?;
        let push_stats = self.push(username, password)?;

        Ok(SyncStats {
            received: pull_stats.received,
            sent: push_stats.sent,
            rounds: pull_stats.rounds + push_stats.rounds,
        })
    }

    /// Send request using file:// protocol (for local testing).
    fn send_request(&self, request: &Message) -> Result<Message> {
        use std::io::Write;
        use std::process::{Command, Stdio};

        let body = request.encode()?;

        // Extract path from file:// URL
        let path = self.url.strip_prefix("file://").ok_or_else(|| {
            FossilError::SyncError(
                "SyncClient only supports file:// URLs. Use QUIC sync for network sync."
                    .to_string(),
            )
        })?;

        let http_req = format!(
            "POST /xfer HTTP/1.0\r\nContent-Type: application/x-heroforge\r\nContent-Length: {}\r\n\r\n",
            body.len()
        );

        let mut full_req = http_req.into_bytes();
        full_req.extend_from_slice(&body);

        let mut child = Command::new("heroforge")
            .args(["http", path])
            .stdin(Stdio::piped())
            .stdout(Stdio::piped())
            .spawn()
            .map_err(|e| FossilError::SyncError(format!("Failed to run heroforge http: {}", e)))?;

        if let Some(mut stdin) = child.stdin.take() {
            stdin.write_all(&full_req)?;
        }

        let output = child.wait_with_output()?;

        if let Some(pos) = output.stdout.windows(4).position(|w| w == b"\r\n\r\n") {
            let body_start = pos + 4;
            let body_bytes = &output.stdout[body_start..];
            Message::decode(body_bytes)
        } else {
            Err(FossilError::SyncError("Invalid HTTP response".to_string()))
        }
    }

    fn has_artifact(&self, hash: &str) -> Result<bool> {
        match self.repo.database().get_rid_by_hash(hash) {
            Ok(_) => Ok(true),
            Err(_) => Ok(false),
        }
    }

    fn store_artifact(
        &self,
        artifact_id: &str,
        delta_source: Option<&str>,
        content: &[u8],
        is_compressed: bool,
    ) -> Result<()> {
        if delta_source.is_some() {
            return Ok(());
        }

        let data = if is_compressed {
            blob::decompress(content)?
        } else {
            content.to_vec()
        };

        let computed_hash = hash::sha3_256_hex(&data);
        if !artifact_id.starts_with(&computed_hash[..artifact_id.len().min(computed_hash.len())]) {
            return Ok(());
        }

        let compressed = blob::compress(&data)?;
        self.repo
            .database()
            .insert_blob(&compressed, &computed_hash, data.len() as i64)?;

        Ok(())
    }

    fn get_artifact_content(&self, hash: &str) -> Result<Vec<u8>> {
        blob::get_artifact_by_hash(self.repo.database(), hash)
    }

    fn get_unclustered_artifacts(&self) -> Result<Vec<String>> {
        let mut stmt = self
            .repo
            .database()
            .connection()
            .prepare("SELECT uuid FROM blob WHERE rid IN (SELECT rid FROM unclustered)")?;

        let hashes: Vec<String> = stmt
            .query_map([], |row| row.get(0))?
            .filter_map(|r| r.ok())
            .collect();

        Ok(hashes)
    }
}

/// Statistics from a sync operation.
#[derive(Debug, Clone)]
pub struct SyncStats {
    /// Number of artifacts received.
    pub received: usize,
    /// Number of artifacts sent.
    pub sent: usize,
    /// Number of round trips.
    pub rounds: usize,
}

impl std::fmt::Display for SyncStats {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "Received: {}, Sent: {}, Rounds: {}",
            self.received, self.sent, self.rounds
        )
    }
}