mars-agents 0.0.14

//! `mars check [PATH]` — validate a source package before publishing.
//!
//! Scans a directory as a mars source package
//! (`agents/*.md`, `skills/*/SKILL.md`, or a flat root `SKILL.md`)
//! and validates structure, frontmatter, and internal skill dependencies.
//! No config or lock file needed — works on raw source directories.

use std::collections::{HashMap, HashSet};
use std::path::PathBuf;

use serde::Serialize;

use crate::discover;
use crate::error::MarsError;
use crate::frontmatter;

use super::output;

/// Arguments for `mars check`.
#[derive(Debug, clap::Args)]
pub struct CheckArgs {
    /// Directory to validate as a source package (default: current directory).
    pub path: Option<PathBuf>,
}

#[derive(Debug, Serialize)]
struct CheckReport {
    agents: usize,
    skills: usize,
    errors: Vec<String>,
    warnings: Vec<String>,
}

/// Run `mars check`.
pub fn run(args: &CheckArgs, json: bool) -> Result<i32, MarsError> {
    let base = match &args.path {
        Some(p) => {
            if p.is_absolute() {
                p.clone()
            } else {
                std::env::current_dir()?.join(p)
            }
        }
        None => std::env::current_dir()?,
    };

    if !base.is_dir() {
        return Err(MarsError::Config(crate::error::ConfigError::Invalid {
            message: format!("{} is not a directory", base.display()),
        }));
    }

    let skills_dir = base.join("skills");

    let mut errors: Vec<String> = Vec::new();
    let mut warnings: Vec<String> = Vec::new();

    let discovered = discover::discover_source(&base, None)?;

    // ── Validate discovered agents/skills ────────────────────────────
    let mut agent_names: HashMap<String, PathBuf> = HashMap::new();
    let mut agent_skill_refs: Vec<(String, Vec<String>)> = Vec::new();
    let mut skill_names: HashMap<String, PathBuf> = HashMap::new();

    for item in discovered {
        let path = base.join(&item.source_path);
        match item.id.kind {
            crate::lock::ItemKind::Agent => {
                if super::is_symlink(&path) {
                    let name = path
                        .file_stem()
                        .and_then(|n| n.to_str())
                        .unwrap_or_default();
                    warnings.push(format!(
                        "skipping symlinked agent `{name}` — source packages should not contain symlinks"
                    ));
                    continue;
                }

                let filename = path
                    .file_stem()
                    .and_then(|n| n.to_str())
                    .unwrap_or_default()
                    .to_string();

                match std::fs::read_to_string(&path) {
                    Ok(content) => match frontmatter::parse(&content) {
                        Ok(fm) => {
                            let name = fm
                                .name()
                                .map(str::to_string)
                                .unwrap_or_else(|| filename.clone());

                            if fm.name().is_none() {
                                warnings.push(format!(
                                    "agent `{filename}` has no `name` in frontmatter"
                                ));
                            }

                            if fm.get("description").and_then(|v| v.as_str()).is_none() {
                                warnings.push(format!("agent `{name}` has no `description`"));
                            }

                            if fm.name().is_some() && name != filename {
                                warnings.push(format!(
                                    "agent filename `{filename}.md` doesn't match name `{name}` in frontmatter"
                                ));
                            }

                            if let Some(existing) = agent_names.get(&name) {
                                errors.push(format!(
                                    "duplicate agent name `{name}` in {} and {}",
                                    existing.display(),
                                    path.display()
                                ));
                            } else {
                                agent_names.insert(name.clone(), path.clone());
                            }

                            let skills = fm.skills();
                            if !skills.is_empty() {
                                agent_skill_refs.push((name, skills));
                            }
                        }
                        Err(e) => {
                            errors.push(format!("agent `{filename}` has invalid frontmatter: {e}"));
                        }
                    },
                    Err(e) => {
                        errors.push(format!("cannot read {}: {e}", path.display()));
                    }
                }
            }
            crate::lock::ItemKind::Skill => {
                let (dirname, skill_md, duplicate_path) = if item.source_path
                    == std::path::Path::new(".")
                {
                    let dirname = item.id.name.to_string();
                    (dirname, base.join("SKILL.md"), base.join("SKILL.md"))
                } else {
                    if super::is_symlink(&path) {
                        let name = path
                            .file_name()
                            .and_then(|n| n.to_str())
                            .unwrap_or_default();
                        warnings.push(format!(
                            "skipping symlinked skill `{name}` — source packages should not contain symlinks"
                        ));
                        continue;
                    }
                    let dirname = path
                        .file_name()
                        .and_then(|n| n.to_str())
                        .unwrap_or_default()
                        .to_string();
                    (dirname, path.join("SKILL.md"), path.clone())
                };

                match std::fs::read_to_string(&skill_md) {
                    Ok(content) => match frontmatter::parse(&content) {
                        Ok(fm) => {
                            let name = fm
                                .name()
                                .map(str::to_string)
                                .unwrap_or_else(|| dirname.clone());

                            if fm.name().is_none() {
                                warnings.push(format!(
                                    "skill `{dirname}` has no `name` in frontmatter"
                                ));
                            }

                            if fm.get("description").and_then(|v| v.as_str()).is_none() {
                                warnings.push(format!("skill `{name}` has no `description`"));
                            }

                            if fm.name().is_some() && name != dirname {
                                warnings.push(format!(
                                    "skill dirname `{dirname}` doesn't match name `{name}` in frontmatter"
                                ));
                            }

                            if let Some(existing) = skill_names.get(&name) {
                                errors.push(format!(
                                    "duplicate skill name `{name}` in {} and {}",
                                    existing.display(),
                                    duplicate_path.display()
                                ));
                            } else {
                                skill_names.insert(name, duplicate_path);
                            }
                        }
                        Err(e) => {
                            errors.push(format!("skill `{dirname}` has invalid frontmatter: {e}"));
                        }
                    },
                    Err(e) => {
                        errors.push(format!("cannot read {}: {e}", skill_md.display()));
                    }
                }
            }
        }
    }

    // Structural validation for nested skill layout:
    // if skills/* directories exist, each must contain SKILL.md.
    if skills_dir.is_dir() {
        let mut entries: Vec<_> = std::fs::read_dir(&skills_dir)?
            .filter_map(|e| e.ok())
            .filter(|e| e.path().is_dir())
            .collect();
        entries.sort_by_key(|e| e.file_name());
        for entry in entries {
            let path = entry.path();
            let dirname = path
                .file_name()
                .and_then(|n| n.to_str())
                .unwrap_or_default();
            if !path.join("SKILL.md").exists() {
                errors.push(format!("skill `{dirname}` is missing SKILL.md"));
            }
        }
    }

    let agent_count = agent_names.len();
    let skill_count = skill_names.len();

    // ── Empty package check ──────────────────────────────────────────
    if agent_count == 0 && skill_count == 0 {
        errors.push("no agents or skills found — is this a mars source package?".to_string());
    }

    // ── Skill dependency check ───────────────────────────────────────
    let available: HashSet<&str> = skill_names.keys().map(|s| s.as_str()).collect();
    let mut external_deps: HashMap<String, Vec<String>> = HashMap::new();

    for (agent_name, skills) in &agent_skill_refs {
        for skill in skills {
            if !available.contains(skill.as_str()) {
                external_deps
                    .entry(skill.clone())
                    .or_default()
                    .push(agent_name.clone());
            }
        }
    }

    if !external_deps.is_empty() {
        let mut sorted: Vec<_> = external_deps.iter().collect();
        sorted.sort_by_key(|(name, _)| name.as_str());
        for (skill, agents) in &sorted {
            warnings.push(format!(
                "external dependency: `{skill}` (referenced by: {})",
                agents.join(", ")
            ));
        }
    }

    // ── Output ───────────────────────────────────────────────────────
    let report = CheckReport {
        agents: agent_count,
        skills: skill_count,
        errors: errors.clone(),
        warnings: warnings.clone(),
    };

    if json {
        output::print_json(&report);
    } else {
        println!("  {} agents, {} skills", agent_count, skill_count);
        println!();

        if errors.is_empty() && warnings.is_empty() {
            output::print_success("all checks passed");
        } else {
            for e in &errors {
                output::print_error(e);
            }
            for w in &warnings {
                output::print_warn(w);
            }
            if !errors.is_empty() {
                println!();
                println!("  {} error(s) found", errors.len());
            }
        }
    }

    if errors.is_empty() { Ok(0) } else { Ok(1) }
}

#[cfg(test)]
mod tests {
    use tempfile::TempDir;

    #[test]
    fn check_skips_symlinked_agent() {
        let dir = TempDir::new().unwrap();
        let agents = dir.path().join("agents");
        std::fs::create_dir_all(&agents).unwrap();

        // Real agent
        std::fs::write(
            agents.join("real.md"),
            "---\nname: real\ndescription: real agent\n---\n# Real",
        )
        .unwrap();

        // Symlinked agent pointing to the real one
        std::os::unix::fs::symlink(agents.join("real.md"), agents.join("linked.md")).unwrap();

        let args = super::CheckArgs {
            path: Some(dir.path().to_path_buf()),
        };
        // Should succeed (the symlink is warned, not errored)
        let code = super::run(&args, true).unwrap();
        // No structural errors — the real agent is valid
        assert_eq!(code, 0);
    }

    #[test]
    fn check_skips_symlinked_skill() {
        let dir = TempDir::new().unwrap();
        let skills = dir.path().join("skills");
        let real_skill = skills.join("real-skill");
        std::fs::create_dir_all(&real_skill).unwrap();
        std::fs::write(
            real_skill.join("SKILL.md"),
            "---\nname: real-skill\ndescription: a skill\n---\n# Skill",
        )
        .unwrap();

        // Symlinked skill dir
        std::os::unix::fs::symlink(&real_skill, skills.join("linked-skill")).unwrap();

        // Also add an agent so the package isn't empty
        let agents = dir.path().join("agents");
        std::fs::create_dir_all(&agents).unwrap();
        std::fs::write(
            agents.join("coder.md"),
            "---\nname: coder\ndescription: agent\n---\n# Coder",
        )
        .unwrap();

        let args = super::CheckArgs {
            path: Some(dir.path().to_path_buf()),
        };
        let code = super::run(&args, true).unwrap();
        assert_eq!(code, 0);
    }

    #[test]
    fn check_accepts_flat_skill_repo() {
        let dir = TempDir::new().unwrap();
        std::fs::write(
            dir.path().join("SKILL.md"),
            "---\nname: flat-skill\ndescription: flat layout\n---\n# Flat skill",
        )
        .unwrap();

        let args = super::CheckArgs {
            path: Some(dir.path().to_path_buf()),
        };
        let code = super::run(&args, true).unwrap();
        assert_eq!(code, 0);
    }
}