ggen-cli-lib 26.5.19

//! Explain artifact origin handler
//! Verb: explain | Noun: artifact/code

use crate::commands::paas::errors::Result;
use std::path::Path;

/// Explain the RDF specification origin of an artifact
pub async fn explain_artifact(path: &Path, show_spec: bool, show_pipeline: bool) -> Result<()> {
    println!("🔍 Artifact Origin");
    println!("=================");
    println!("Path: {}", path.display());
    println!("Show spec: {}", if show_spec { "yes" } else { "no" });
    println!("Show pipeline: {}", if show_pipeline { "yes" } else { "no" });
    println!();

    if !path.exists() {
        println!("⚠️  Path does not exist: {}", path.display());
        println!();
        println!("💡 This feature traces generated artifacts back to their RDF specifications.");
        println!("   In a full implementation, it would show:");
        println!("   - Original RDF triples");
        println!("   - Transformation pipeline stages (μ₁-μ₅)");
        println!("   - Template used for generation");
        println!("   - Git commit that introduced the artifact");
        return Ok(());
    }

    // Try to identify file type and provide relevant information
    if path.is_file() {
        if let Some(ext) = path.extension() {
            match ext.to_str() {
                Some("rs") => {
                    println!("Type: Rust source file");
                    println!();
                    println!("Generation Pipeline:");
                    println!("  1. μ₁ (Load): RDF specification loaded from .specify/");
                    println!("  2. μ₂ (Extract): Type definitions extracted");
                    println!("  3. μ₃ (Generate): Rust code generated via templates");
                    println!("  4. μ₄ (Validate): Compilation and type checking");
                    println!("  5. μ₅ (Emit): Source file written to disk");
                }
                Some("ttl") => {
                    println!("Type: RDF Turtle specification");
                    println!();
                    println!("This is a source specification file (not generated).");
                    println!("It defines ontology elements that drive code generation.");
                }
                Some("toml") => {
                    println!("Type: Configuration file");
                    println!();
                    println!("Configuration files are typically hand-written,");
                    println!("not generated from RDF specifications.");
                }
                _ => {
                    println!("Type: Unknown file type");
                    println!();
                    println!("Extension: {}", ext.to_string_lossy());
                }
            }
        }

        if show_spec {
            println!();
            println!("📋 RDF Specification");
            println!("===================");
            println!("⚠️  Specification tracing not yet implemented");
            println!();
            println!("In a full implementation, this would show:");
            println!("  - Original RDF triples that generated this file");
            println!("  - Ontology classes and properties used");
            println!("  - Template variables and their values");
        }

        if show_pipeline {
            println!();
            println!("⚙️  Transformation Pipeline");
            println!("=========================");
            println!("⚠️  Pipeline details not yet implemented");
            println!();
            println!("In a full implementation, this would show:");
            println!("  - μ₁: Specification loading details");
            println!("  - μ₂: Extraction process and intermediates");
            println!("  - μ₃: Template rendering process");
            println!("  - μ₄: Validation results");
            println!("  - μ₅: File emission details");
        }
    } else {
        println!("Type: Directory");
        println!();
        println!("Directories are not generated artifacts.");
        println!("They contain source specifications or generated code.");
    }

    Ok(())
}

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

    #[tokio::test]
    async fn test_explain_nonexistent_file() {
        let result = explain_artifact(Path::new("/nonexistent"), false, false).await;
        assert!(result.is_ok()); // Gracefully handles missing files
    }

    #[tokio::test]
    async fn test_explain_with_details() {
        let result = explain_artifact(Path::new("."), true, true).await;
        assert!(result.is_ok());
    }

    #[tokio::test]
    async fn test_explain_rust_file() {
        let result = explain_artifact(Path::new("src/main.rs"), false, false).await;
        assert!(result.is_ok());
    }
}