jbuild 0.1.8

High-performance Java build tool supporting Maven and Gradle
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//! Gradle to jbuild migration utilities

use anyhow::Result;
use std::path::Path;

/// Migrate Gradle project to jbuild
pub struct GradleMigrator;

impl GradleMigrator {
    /// Migrate a Gradle project to jbuild
    pub fn migrate(build_gradle_path: &Path) -> Result<MigrationResult> {
        if !build_gradle_path.exists() {
            return Err(anyhow::anyhow!(
                "Gradle build file not found: {}",
                build_gradle_path.display()
            ));
        }

        let gradle_content = std::fs::read_to_string(build_gradle_path)?;
        let config = Self::generate_jbuild_config(&gradle_content)?;

        Ok(MigrationResult {
            config,
            warnings: vec!["Gradle migration is experimental".to_string()],
            notes: vec![
                "Review and adjust dependencies".to_string(),
                "Convert custom Gradle tasks to jbuild goals".to_string(),
            ],
        })
    }

    fn generate_jbuild_config(gradle: &str) -> Result<String> {
        let mut config = String::from("# Generated by jbuild Gradle migrator\n\n");
        config.push_str("[package]\n");
        config.push_str("name = \"project-name\"\n");
        config.push_str("version = \"1.0.0\"\n\n");

        // Parse and convert dependencies
        for line in gradle.lines() {
            if line.contains("implementation") || line.contains("testImplementation") {
                if let Some(dep) = Self::extract_dependency(line) {
                    config.push_str(&dep);
                    config.push('\n');
                }
            }
        }

        Ok(config)
    }

    fn extract_dependency(line: &str) -> Option<String> {
        // Extract dependency from Gradle format
        let line = line.trim();
        if !line.starts_with("implementation ") && !line.starts_with("testImplementation ") {
            return None;
        }

        let dep_str = line
            .trim_start_matches("implementation ")
            .trim_start_matches("testImplementation ")
            .trim()
            .trim_matches('\'')
            .trim_matches('"');

        let parts: Vec<&str> = dep_str.split(':').collect();
        if parts.len() >= 3 {
            Some(format!(
                r#"{{ group = "{}", artifact = "{}", version = "{}" }}"#,
                parts[0], parts[1], parts[2]
            ))
        } else {
            None
        }
    }
}

/// Result of Gradle migration
#[derive(Debug, Clone)]
pub struct MigrationResult {
    pub config: String,
    pub warnings: Vec<String>,
    pub notes: Vec<String>,
}

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

    #[test]
    fn test_extract_dependency() {
        let line = "implementation 'org.junit.jupiter:junit-jupiter:5.10.0'";
        let result = GradleMigrator::extract_dependency(line);
        assert!(result.is_some());
        assert!(result.unwrap().contains("org.junit.jupiter"));
    }
}