procyon 0.1.1

use std::path::{Path, PathBuf};

use crate::account::{get_accounts_path, AccountStore};
use crate::project::Project;

const IDENTITY: &str = "\
You are Procyon, a terminal development harness for Stellar and Soroban smart contracts. You \
work inside the user's workspace through the tools you are given.";

const WORKING_RULES: &str = "\
## Working rules

- Locate code with `glob` and `grep` before reading it. Do not guess file paths.
- When the answer depends on how Stellar or Soroban actually behaves — storage and TTL, auth, \
SEPs, CLI flags, fees, XDR — or on explaining a contract or host error, look it up with a \
connected MCP tool and cite what you found. Prefer looking it up over recalling from memory, \
and say so plainly when no source is available rather than guessing.
- Every file tool is confined to the workspace; paths outside it are rejected, so do not try \
absolute paths elsewhere.
- `write_file` and `edit_file` change the user's files immediately and are not undoable by you. \
Read a file before editing it, and prefer `edit_file` over rewriting a whole file.
- In a project that has `caatinga.config.ts`, use the `caatinga_*` tools for build, deploy and \
invoke rather than raw `stellar` CLI commands. They take contract *names* from that config, never \
a wasm path or a contract id: Caatinga resolves those from `caatinga.artifacts.json`, deploys in \
dependency order, and regenerates bindings afterwards. Do not copy a contract id out of a deploy \
log — read it from the artifacts, or let the tool report it. In a project without that config the \
`caatinga_*` tools will refuse, and the `stellar` CLI is the right path.
- Signing is always by Stellar CLI identity alias, such as `alice`. Never pass a secret key, seed \
phrase or raw address as `source`: it would reach the process list and the session log.
- Any tool that signs and submits requires the network as an explicit argument; there is no \
default. State the network you are about to act on before calling it.
- Mainnet is refused unless the operator enabled it in the config or the environment. You cannot \
enable it — if a mainnet operation is wanted, say what the user has to set and stop. Prefer \
`caatinga_read` over `caatinga_invoke` whenever you only need to read a value: it simulates, so it \
signs nothing and costs nothing.
- When a tool fails, read its error before retrying. Do not repeat an identical failing call.";

/// How many operations the ledger keeps.
///
/// Enough to cover a build → deploy → invoke sequence and the failure that stopped it, and no more:
/// this text is prepended to every turn, so its cost is paid on each one.
const RECENT_OPERATIONS: usize = 8;

/// One tool call and how it ended.
#[derive(Debug, Clone, PartialEq)]
pub struct Operation {
    pub tool: String,
    pub ok: bool,
    /// Why it failed, in one line. `None` when it succeeded — a list of successes is context, and
    /// their output is already in the conversation.
    pub reason: Option<String>,
}

/// The last few tool calls of this session, whatever else has happened to the conversation.
///
/// The model does see tool results in its own history, but only for as long as that history
/// survives: compaction drops the head of the conversation, and `--resume` folds a log back into
/// messages. What went wrong ten minutes ago is exactly what stops being visible first, and it is
/// exactly what "why did that fail?" needs. Quick actions have the same problem from the other
/// direction — Ctrl+B runs outside any turn, so nothing recorded it for the next one.
///
/// Bounded, and holds a one-line reason rather than the tool's output: this is a ledger of what
/// happened, not a second transcript.
#[derive(Debug, Default)]
pub struct OperationLog {
    entries: std::collections::VecDeque<Operation>,
}

impl OperationLog {
    /// Records an outcome. `Err` carries the failure as the model was told it.
    pub fn record(&mut self, tool: &str, outcome: Result<(), &str>) {
        if self.entries.len() == RECENT_OPERATIONS {
            self.entries.pop_front();
        }
        self.entries.push_back(Operation {
            tool: tool.to_string(),
            ok: outcome.is_ok(),
            reason: outcome.err().map(first_line),
        });
    }

    pub fn recent(&self) -> Vec<Operation> {
        self.entries.iter().cloned().collect()
    }
}

/// The first line of an error, short enough to sit in a prompt.
///
/// A tool result can be a whole compiler run; the ledger's job is to say which call failed and
/// roughly why, and the model can read the rest with the tool that produced it.
fn first_line(text: &str) -> String {
    let line = text.lines().find(|l| !l.trim().is_empty()).unwrap_or(text);
    let line = line.trim();
    match line.char_indices().nth(160) {
        Some((cut, _)) => format!("{}…", &line[..cut]),
        None => line.to_string(),
    }
}

// Rebuilt every turn so the model sees the workspace as it is now, not as it was at boot.
pub struct WorkspaceContext {
    pub cwd: PathBuf,
    pub project: Option<Project>,
    pub accounts: Vec<String>,
    pub stellar_cli: Option<String>,
    pub npx: bool,
    pub mcp_servers: Vec<String>,
    /// Named so the model knows they exist. It has `list_skills`, but a tool nobody knows to call
    /// is the same as no tool — it would answer from memory instead.
    pub skills: Vec<String>,
    /// Oldest first, from [`OperationLog`].
    pub operations: Vec<Operation>,
    /// Source files written since the last successful build, from `crate::verify`.
    pub unverified: Vec<String>,
}

impl WorkspaceContext {
    pub async fn gather(cwd: &Path, mcp_servers: &[String]) -> Self {
        let discovered = Project::discover(cwd).await;
        let project_dir = discovered.as_ref().map(|d| d.dir.clone());
        let project = discovered.map(|d| d.project);

        let accounts = match &project_dir {
            Some(dir) => AccountStore::load(&get_accounts_path(dir))
                .await
                .map(|store| {
                    store
                        .list()
                        .iter()
                        .map(|a| format!("{} ({}) [{}]", a.name, a.address, a.network))
                        .collect()
                })
                .unwrap_or_default(),
            None => Vec::new(),
        };

        Self {
            cwd: cwd.to_path_buf(),
            project,
            accounts,
            stellar_cli: stellar_cli_version().await,
            npx: which::which("npx").is_ok(),
            mcp_servers: mcp_servers.to_vec(),
            skills: Vec::new(),
            operations: Vec::new(),
            unverified: Vec::new(),
        }
    }

    /// Adds what the session knows that the filesystem does not.
    ///
    /// Separate from `gather` because neither can be discovered from `cwd`: the skill registry is
    /// process-wide and the ledger belongs to the running session.
    pub fn with_session(mut self, skills: Vec<String>, operations: Vec<Operation>) -> Self {
        self.skills = skills;
        self.operations = operations;
        self
    }

    /// Names the writes no build has covered yet. See `crate::verify`.
    pub fn with_unverified(mut self, unverified: Vec<String>) -> Self {
        self.unverified = unverified;
        self
    }

    pub fn system_prompt(&self) -> String {
        let mut out = String::from(IDENTITY);
        out.push_str("\n\n## Environment\n\n");
        out.push_str(&format!("- Workspace: {}\n", self.cwd.display()));

        match &self.project {
            Some(project) => {
                out.push_str(&format!(
                    "- Project: {} v{}\n- Default network: {}\n",
                    project.name, project.version, project.default_network
                ));
                if project.contracts.is_empty() {
                    out.push_str("- Contracts: none registered yet\n");
                } else {
                    out.push_str("- Contracts:\n");
                    for contract in &project.contracts {
                        out.push_str(&format!(
                            "  - {} ({})\n",
                            contract.name,
                            contract.address.as_deref().unwrap_or("not deployed")
                        ));
                    }
                }
                // The model must not conclude from a named project that project state exists:
                // accounts and `project_init`-backed tools still need `.procyon/`.
                if project.is_inferred() {
                    out.push_str(
                        "- Project state: read from the repository itself; there is no \
                         `.procyon/project.toml`. Tools that need project state will say so — run \
                         `project_init` only if the user asks for it.\n",
                    );
                }
            }
            None => out.push_str(
                "- Project: no .procyon/project.toml found. Use `project_init` before tools that \
                 need project state.\n",
            ),
        }

        if self.accounts.is_empty() {
            out.push_str("- Accounts: none configured\n");
        } else {
            out.push_str("- Accounts:\n");
            for account in &self.accounts {
                out.push_str(&format!("  - {}\n", account));
            }
        }

        // Stated explicitly so the model does not propose a toolchain that is not installed.
        out.push_str(&format!(
            "- stellar CLI: {}\n- npx: {}\n",
            self.stellar_cli.as_deref().unwrap_or("not installed"),
            if self.npx {
                "available"
            } else {
                "not installed"
            }
        ));
        if self.mcp_servers.is_empty() {
            out.push_str(
                "- MCP servers: none connected, so you have no way to look up Stellar facts\n",
            );
        } else {
            out.push_str("- MCP servers:\n");
            for server in &self.mcp_servers {
                out.push_str(&format!("  - {}\n", server));
            }
        }

        if self.skills.is_empty() {
            out.push_str("- Skills: none installed\n");
        } else {
            out.push_str(&format!(
                "- Skills (load with `run_skill`): {}\n",
                self.skills.join(", ")
            ));
        }

        // Named so delegation is a real option rather than something the model has to already know
        // to try. Each has its own tool list and a ceiling on what it may do — `talk_to` hands it a
        // registry cut to that ceiling, so routing to the wrong one costs nothing it can undo.
        out.push_str(
            "- Specialists (reach with `talk_to`): SorobanArchitect (contract and project \
             design, read-only), ContractDebugger (build/simulation/auth failures, may build and \
             test), StellarTransactionExpert (XDR, fees, signatures, networks, read-only), \
             SecurityAuditor (contract and permission review, read-only), FrontendIntegrator \
             (bindings, wallets, client SDKs, may write files), DeploymentEngineer (build, deploy, \
             invoke — the only one that may sign). Prefer delegating to the specialist whose \
             description matches the question over answering it yourself, especially for a \
             security review or a transaction-level question.\n",
        );

        // Writing a file always succeeds, so nothing else in this prompt distinguishes code that
        // compiles from code that was merely produced. Named per file rather than as a flag: "run
        // a build" is advice, and a list is a thing the model can see it has not done.
        if !self.unverified.is_empty() {
            out.push_str("\n## Written but never compiled\n\n");
            for path in &self.unverified {
                out.push_str(&format!("- {}\n", path));
            }
            out.push_str(
                "\nNo build or test run has covered these changes. Run `caatinga_build` (or \
                 `run_tests`) and read the result before describing this work as done. \
                 `caatinga_deploy` will refuse until then: it ships the wasm from the last build, \
                 so deploying now would put the previous version of the contract on chain.\n",
            );
        }

        // Last, and as its own section: it is the only part of the prompt that says what has
        // already been tried, and a failure buried in a list of environment facts reads as one.
        if !self.operations.is_empty() {
            out.push_str("\n## Recent operations, oldest first\n\n");
            for operation in &self.operations {
                match (&operation.reason, operation.ok) {
                    (Some(reason), _) => {
                        out.push_str(&format!("- {} — failed: {}\n", operation.tool, reason))
                    }
                    (None, true) => out.push_str(&format!("- {} — ok\n", operation.tool)),
                    (None, false) => out.push_str(&format!("- {} — failed\n", operation.tool)),
                }
            }
            out.push_str(
                "\nThese ran earlier in this session and may predate the conversation you can \
                 see. A call listed as failed failed; do not present it as done, and do not repeat \
                 it unchanged.\n",
            );
        }

        out.push('\n');
        out.push_str(WORKING_RULES);
        out
    }
}

async fn stellar_cli_version() -> Option<String> {
    if which::which("stellar").is_err() {
        return None;
    }
    let output = tokio::process::Command::new("stellar")
        .arg("--version")
        .output()
        .await
        .ok()?;
    if !output.status.success() {
        return None;
    }
    String::from_utf8_lossy(&output.stdout)
        .lines()
        .next()
        .map(|line| line.trim().to_string())
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::project::{Contract, Network};

    fn context() -> WorkspaceContext {
        WorkspaceContext {
            cwd: PathBuf::from("/w/demo"),
            project: None,
            accounts: Vec::new(),
            stellar_cli: None,
            npx: false,
            mcp_servers: Vec::new(),
            skills: Vec::new(),
            operations: Vec::new(),
            unverified: Vec::new(),
        }
    }

    #[test]
    fn states_the_identity_and_the_workspace() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("Stellar and Soroban"));
        assert!(prompt.contains("/w/demo"));
    }

    #[test]
    fn says_plainly_when_there_is_no_project() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("no .procyon/project.toml found"));
        assert!(prompt.contains("Accounts: none configured"));
    }

    #[test]
    fn reports_missing_tooling_instead_of_staying_silent() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("stellar CLI: not installed"));
        assert!(prompt.contains("npx: not installed"));
    }

    #[test]
    fn includes_project_network_and_contract_addresses() {
        let mut ctx = context();
        ctx.project = Some(Project {
            name: "demo".to_string(),
            version: "0.2.0".to_string(),
            default_network: Network::Testnet,
            contracts: vec![
                Contract {
                    name: "token".to_string(),
                    address: Some("CDLZ".to_string()),
                    wasm_path: None,
                },
                Contract {
                    name: "pending".to_string(),
                    address: None,
                    wasm_path: None,
                },
            ],
            ..Project::new("demo")
        });
        ctx.accounts = vec!["alice (GALICE) [testnet]".to_string()];

        let prompt = ctx.system_prompt();
        assert!(prompt.contains("demo v0.2.0"));
        assert!(prompt.contains("Default network: testnet"));
        assert!(prompt.contains("token (CDLZ)"));
        assert!(prompt.contains("pending (not deployed)"));
        assert!(prompt.contains("alice (GALICE) [testnet]"));
    }

    #[test]
    fn names_the_installed_skills_so_the_model_knows_they_exist() {
        let mut ctx = context();
        ctx.skills = vec!["soroban".to_string(), "caatinga".to_string()];
        let prompt = ctx.system_prompt();
        assert!(prompt.contains("run_skill"), "got {}", prompt);
        assert!(prompt.contains("soroban, caatinga"), "got {}", prompt);
    }

    #[test]
    fn says_plainly_when_no_skill_is_installed() {
        assert!(context().system_prompt().contains("Skills: none installed"));
    }

    // The point of the ledger: a failure has to survive the conversation it happened in, because
    // compaction drops the head of that conversation and `--resume` rebuilds it.
    #[test]
    fn a_failed_operation_is_carried_with_its_reason() {
        let mut ctx = context();
        ctx.operations = vec![
            Operation {
                tool: "caatinga_build".to_string(),
                ok: true,
                reason: None,
            },
            Operation {
                tool: "caatinga_deploy".to_string(),
                ok: false,
                reason: Some("no identity named 'alice'".to_string()),
            },
        ];

        let prompt = ctx.system_prompt();
        assert!(prompt.contains("Recent operations"), "got {}", prompt);
        assert!(prompt.contains("caatinga_build — ok"), "got {}", prompt);
        assert!(
            prompt.contains("caatinga_deploy — failed: no identity named 'alice'"),
            "got {}",
            prompt
        );
        // Without this the model reads the list as history it already handled and reports the
        // deploy as done.
        assert!(
            prompt.contains("do not present it as done"),
            "got {}",
            prompt
        );
    }

    // Writing a file always succeeds, so without this nothing in the prompt tells code that
    // compiles apart from code that was merely produced.
    #[test]
    fn code_written_and_never_compiled_is_named_as_such() {
        let mut ctx = context();
        ctx.unverified = vec!["contracts/counter/src/lib.rs".to_string()];

        let prompt = ctx.system_prompt();
        assert!(
            prompt.contains("Written but never compiled"),
            "got {}",
            prompt
        );
        assert!(
            prompt.contains("contracts/counter/src/lib.rs"),
            "got {}",
            prompt
        );
        assert!(prompt.contains("caatinga_build"), "got {}", prompt);
        // Saying the deploy will refuse is what keeps the refusal from reading as a bug when the
        // model hits it.
        assert!(prompt.contains("will refuse"), "got {}", prompt);
    }

    #[test]
    fn a_workspace_with_nothing_unbuilt_carries_no_such_section() {
        assert!(!context()
            .system_prompt()
            .contains("Written but never compiled"));
    }

    #[test]
    fn a_session_with_nothing_behind_it_carries_no_empty_section() {
        assert!(!context().system_prompt().contains("Recent operations"));
    }

    #[test]
    fn the_ledger_keeps_the_most_recent_operations() {
        let mut log = OperationLog::default();
        for index in 0..RECENT_OPERATIONS + 3 {
            log.record(&format!("tool{}", index), Ok(()));
        }

        let recent = log.recent();
        assert_eq!(recent.len(), RECENT_OPERATIONS);
        assert_eq!(
            recent.first().unwrap().tool,
            "tool3",
            "oldest dropped first"
        );
        assert_eq!(recent.last().unwrap().tool, "tool10");
    }

    // A tool result can be an entire compiler run. The ledger is prepended to every later turn, so
    // it keeps a line, not a transcript.
    #[test]
    fn a_recorded_failure_is_reduced_to_one_line() {
        let mut log = OperationLog::default();
        log.record(
            "run_tests",
            Err("error[E0308]: mismatched types\n  --> src/lib.rs:12\nand 300 more lines"),
        );

        let reason = log.recent()[0].reason.clone().unwrap();
        assert_eq!(reason, "error[E0308]: mismatched types");
    }

    #[test]
    fn a_long_single_line_failure_is_cut_rather_than_carried_whole() {
        let mut log = OperationLog::default();
        log.record("stellar_invoke", Err(&"x".repeat(500)));

        let reason = log.recent()[0].reason.clone().unwrap();
        assert!(
            reason.chars().count() <= 161,
            "got {} chars",
            reason.chars().count()
        );
        assert!(reason.ends_with('…'));
    }

    #[test]
    fn says_plainly_when_no_mcp_server_is_connected() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("none connected"), "got {}", prompt);
    }

    #[test]
    fn lists_connected_mcp_servers_and_their_tools() {
        let mut ctx = context();
        ctx.mcp_servers = vec!["raven (https://raven.stellar.org/mcp): raven__search".to_string()];
        let prompt = ctx.system_prompt();
        assert!(prompt.contains("raven__search"), "got {}", prompt);
        assert!(prompt.contains("https://raven.stellar.org/mcp"));
    }

    #[test]
    fn directs_the_model_to_look_up_rather_than_recall() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("Prefer looking it up over recalling from memory"));
        assert!(prompt.contains("host error"));
    }

    #[test]
    fn tells_the_model_to_search_before_reading() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("`glob`"));
        assert!(prompt.contains("`grep`"));
        assert!(prompt.contains("Do not guess file paths"));
    }

    #[test]
    fn warns_about_mainnet_and_unrecoverable_writes() {
        let prompt = context().system_prompt();
        assert!(prompt.contains("mainnet"));
        assert!(prompt.contains("not undoable"));
    }

    #[test]
    fn an_inferred_project_is_described_but_flagged_as_having_no_state() {
        let mut ctx = context();
        ctx.project = Some(Project {
            name: "my-app".to_string(),
            source: crate::project::ProjectSource::Inferred,
            ..Project::new("my-app")
        });

        let prompt = ctx.system_prompt();
        assert!(prompt.contains("my-app v0.1.0"));
        // Naming the project must not imply `.procyon/` exists — accounts and the tools that need
        // project state still do not.
        assert!(
            prompt.contains("read from the repository itself"),
            "{}",
            prompt
        );
        assert!(prompt.contains("`project_init` only if the user asks"));
    }

    #[test]
    fn a_manifest_project_carries_no_inference_caveat() {
        let mut ctx = context();
        ctx.project = Some(Project::new("demo"));
        assert!(!ctx
            .system_prompt()
            .contains("read from the repository itself"));
    }

    #[tokio::test]
    async fn a_soroban_repo_without_procyon_state_is_still_a_project() {
        let temp = tempfile::tempdir().unwrap();
        let contract = temp.path().join("contracts").join("counter");
        tokio::fs::create_dir_all(&contract).await.unwrap();
        tokio::fs::write(
            contract.join("Cargo.toml"),
            "[package]\nname = \"counter\"\nversion = \"0.1.0\"\n\n[dependencies]\nsoroban-sdk = \"22.0.1\"\n",
        )
        .await
        .unwrap();

        let ctx = WorkspaceContext::gather(temp.path(), &[]).await;
        let project = ctx
            .project
            .as_ref()
            .expect("contracts/counter is a project");
        assert_eq!(project.contracts[0].name, "counter");
        assert!(!ctx
            .system_prompt()
            .contains("no .procyon/project.toml found"));
    }

    #[tokio::test]
    async fn gathering_in_a_directory_without_a_project_does_not_fail() {
        let temp = tempfile::tempdir().unwrap();
        let ctx = WorkspaceContext::gather(temp.path(), &[]).await;
        assert!(ctx.project.is_none());
        assert!(ctx.accounts.is_empty());
        assert!(ctx.system_prompt().contains("no .procyon/project.toml"));
    }
}

#[cfg(test)]
mod dump {
    use super::*;

    // Exercises the real gather() path against the actual working directory, including the MCP
    // servers from the user's config, so this is the prompt the model actually receives.
    // cargo test dump_real_prompt -- --ignored --nocapture
    #[tokio::test]
    #[ignore]
    async fn dump_real_prompt() {
        let cwd = std::env::current_dir().unwrap();

        // Boot-time input in the real app, so a prompt printed without it would be misleading.
        let servers = match crate::config::AppConfig::load() {
            Ok(cfg) => crate::mcp::load_servers(&cfg.mcp_servers).await.1,
            Err(_) => Vec::new(),
        };

        let prompt = WorkspaceContext::gather(&cwd, &servers)
            .await
            .system_prompt();
        println!("{}", prompt);

        assert!(
            prompt.contains(&cwd.display().to_string()),
            "the prompt must name the real workspace"
        );
        assert!(prompt.contains("## Environment"));
        assert!(prompt.contains("## Working rules"));
    }
}