// Integration tests for ggen.toml configuration system
// Tests end-to-end config loading, validation, and workspace resolution

use anyhow::Result;
use std::path::PathBuf;

// Note: These tests will work once ggen-config crate is implemented
// Test structure follows 80/20 principle - focus on critical paths

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

    fn fixture_path(name: &str) -> PathBuf {
        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("tests/fixtures/config")
            .join(name)
    }

    #[test]
    fn test_simple_config_loading() -> Result<()> {
        // Critical path: Load basic config file
        let _config_path = fixture_path("simple.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // assert_eq!(config.project.name, "simple-project");
        // assert_eq!(config.project.version, "0.1.0");
        // assert_eq!(config.templates.source_dir, "templates");

        Ok(())
    }

    #[test]
    fn test_workspace_config_loading() -> Result<()> {
        // Critical path: Load workspace root config
        let _config_path = fixture_path("workspace.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // assert!(config.workspace.is_some());
        // let workspace = config.workspace.unwrap();
        // assert_eq!(workspace.members.len(), 3);
        // assert!(workspace.members.contains(&"packages/api".into()));

        Ok(())
    }

    #[test]
    fn test_advanced_config_all_features() -> Result<()> {
        // Test all feature sections are parsed correctly
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        //
        // // Verify all major sections
        // assert_eq!(config.project.name, "advanced-project");
        // assert!(config.lifecycle.is_some());
        // assert!(config.marketplace.is_some());
        // assert!(config.ai.is_some());
        // assert!(config.graph.is_some());
        // assert!(config.security.is_some());
        // assert!(config.logging.is_some());
        // assert!(config.performance.is_some());
        //
        // // Verify AI provider configuration
        // let ai = config.ai.unwrap();
        // assert_eq!(ai.provider, "anthropic");
        // assert_eq!(ai.model, "claude-3-5-sonnet-20241022");
        // assert!(ai.cache.is_some());

        Ok(())
    }

    #[test]
    fn test_invalid_config_missing_project() {
        // Error handling: Missing required section
        let _config_path = fixture_path("invalid_missing_project.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let result = GgenConfig::load(&config_path);
        // assert!(result.is_err());
        // let err = result.unwrap_err().to_string();
        // assert!(err.contains("project") || err.contains("required"));
    }

    #[test]
    fn test_invalid_config_bad_version() {
        // Error handling: Invalid version format
        let _config_path = fixture_path("invalid_bad_version.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let result = GgenConfig::load(&config_path);
        // assert!(result.is_err());
        // let err = result.unwrap_err().to_string();
        // assert!(err.contains("version") || err.contains("semver"));
    }

    #[test]
    fn test_workspace_member_resolution() -> Result<()> {
        // Critical: Workspace member inherits parent config
        let _workspace_path = fixture_path("workspace.ggen.toml");
        let _member_path = fixture_path("member_package.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let workspace_config = GgenConfig::load(&workspace_path)?;
        // let member_config = GgenConfig::load_with_workspace(&member_path, &workspace_config)?;
        //
        // // Member should inherit workspace dependencies
        // assert!(member_config.has_workspace_dependency("serde"));
        // assert!(member_config.has_workspace_dependency("tokio"));
        //
        // // But can override local settings
        // assert_eq!(member_config.ai.unwrap().provider, "ollama");

        Ok(())
    }

    #[test]
    fn test_config_serialization_roundtrip() -> Result<()> {
        // Test config can be loaded and saved without data loss
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let serialized = toml::to_string(&config)?;
        // let deserialized: GgenConfig = toml::from_str(&serialized)?;
        //
        // assert_eq!(config.project.name, deserialized.project.name);
        // assert_eq!(config.project.version, deserialized.project.version);

        Ok(())
    }

    #[test]
    fn test_environment_variable_expansion() -> Result<()> {
        // Test that env vars in config are resolved
        std::env::set_var("TEST_API_KEY", "test-key-12345");

        // TODO: Uncomment once ggen-config is implemented
        // let config_with_env = r#"
        // [project]
        // name = "test"
        // version = "1.0.0"
        //
        // [ai]
        // api_key_env = "TEST_API_KEY"
        // "#;
        //
        // let config: GgenConfig = toml::from_str(config_with_env)?;
        // let resolved = config.resolve_environment_variables()?;
        // assert_eq!(resolved.ai.unwrap().api_key, Some("test-key-12345".into()));

        Ok(())
    }

    #[test]
    fn test_marketplace_dependency_parsing() -> Result<()> {
        // Test dependency version constraint parsing
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let marketplace = config.marketplace.unwrap();
        //
        // assert_eq!(marketplace.dependencies.len(), 3);
        // assert!(marketplace.dependencies.iter().any(|d| d.starts_with("rust-microservice")));
        // assert!(marketplace.dependencies.iter().any(|d| d.contains("^1.0")));

        Ok(())
    }

    #[test]
    fn test_performance_config_validation() -> Result<()> {
        // Test performance limits are within acceptable ranges
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let perf = config.performance.unwrap();
        //
        // assert!(perf.memory_limit_mb > 0);
        // assert!(perf.cpu_limit_percent <= 100);
        // assert!(perf.cache_size_mb <= perf.memory_limit_mb);

        Ok(())
    }
}

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

    #[test]
    fn test_graph_config_with_base_iri() -> Result<()> {
        // Test graph configuration integration
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let graph = config.graph.unwrap();
        //
        // assert_eq!(graph.base_iri, "http://example.org/advanced/");
        // assert!(graph.cache_queries);
        // assert_eq!(graph.query_timeout_seconds, 45);

        Ok(())
    }

    #[test]
    fn test_graph_dependency_resolution() -> Result<()> {
        // Test that graph-based dependencies work with config
        // TODO: Implement after ggen-config and graph integration is complete
        Ok(())
    }
}

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

    #[test]
    fn test_template_config_paths() -> Result<()> {
        // Test template paths resolve correctly
        let _config_path = fixture_path("simple.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let templates = config.templates;
        //
        // assert_eq!(templates.source_dir, "templates");
        // assert_eq!(templates.output_dir, "generated");

        Ok(())
    }

    #[test]
    fn test_template_backup_configuration() -> Result<()> {
        // Test template backup settings
        let _config_path = fixture_path("advanced.ggen.toml");

        // TODO: Uncomment once ggen-config is implemented
        // let config = GgenConfig::load(&config_path)?;
        // let templates = config.templates;
        //
        // assert!(templates.backup_enabled);
        // assert!(templates.idempotent);

        Ok(())
    }
}

fn fixture_path(name: &str) -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("tests/fixtures/config")
        .join(name)
}
