// file: crates/ksp-app-config-desk/unit_tests/bootstrap.rs
// version: 2

#[test]
fn fallback_logging_is_console_only_and_bounded_to_info() {
    let settings = super::fallback_logging_settings();
    assert_eq!(settings.default_filter(), ksp_logging_lib::LogFilterLevel::Info);
    assert_eq!(settings.span_events(), ksp_logging_lib::SpanEvents::Off);
    assert!(settings.files().is_empty());
    let console = settings.console();
    assert!(console.is_some());
    if let std::option::Option::Some(console) = console {
        assert!(console.enabled());
        assert_eq!(console.output(), ksp_logging_lib::ConsoleOutput::Stderr);
        assert_eq!(console.format(), ksp_logging_lib::LogFormat::Human);
    }
}

#[test]
fn invalid_logging_source_is_planned_as_transient_fallback_before_subscriber_installation() {
    let fixture = BootstrapFixture::new("invalid-source");
    assert!(fixture.is_ok());
    let fixture = match fixture {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let malformed = std::fs::write(fixture.config_root.join(ksp_config_lib::DEFAULT_STD_LOGGING_FILENAME), "{ invalid json");
    assert!(malformed.is_ok());
    let management = fixture.management();
    assert!(management.is_ok());
    let management = match management {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let plan = super::resolve_logging_startup(&management);
    let fallback = matches!(&plan, super::LoggingStartupPlan::Fallback { .. });
    assert!(fallback, "invalid Logging source must produce a fallback startup plan");
    if let super::LoggingStartupPlan::Fallback { diagnostic, settings, .. } = plan {
        assert_eq!(settings.default_filter(), ksp_logging_lib::LogFilterLevel::Info);
        assert!(settings.files().is_empty());
        assert!(!diagnostic.domain.is_empty());
        assert!(!diagnostic.code.is_empty());
        assert!(!diagnostic.message.is_empty());
    }
}

struct BootstrapFixture {
    root: std::path::PathBuf,
    config_root: std::path::PathBuf,
    schema_root: std::path::PathBuf,
}

impl BootstrapFixture {
    fn new(label: &str) -> ksp_core_lib::Result<Self> {
        let root = std::env::temp_dir().join(std::format!("ksp-config-desk-{label}-{}", std::process::id()));
        let cleanup = std::fs::remove_dir_all(root.as_path());
        match cleanup {
            std::result::Result::Ok(()) | std::result::Result::Err(_) => {},
        }
        let config_root = root.join("config");
        let schema_root = root.join("schemas");
        let create_config = std::fs::create_dir_all(config_root.as_path());
        if let std::result::Result::Err(error) = create_config {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(crate::ERROR_CODE_APP_STATE_INVALID, "Cannot create bootstrap test config root").with_source(error),
            );
        }
        let create_schema = std::fs::create_dir_all(schema_root.as_path());
        if let std::result::Result::Err(error) = create_schema {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(crate::ERROR_CODE_APP_STATE_INVALID, "Cannot create bootstrap test schema root").with_source(error),
            );
        }
        let workspace = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
        let workspace = match workspace.parent().and_then(std::path::Path::parent) {
            std::option::Option::Some(value) => value,
            std::option::Option::None => {
                return std::result::Result::Err(ksp_core_lib::Error::new(
                    crate::ERROR_CODE_APP_STATE_INVALID,
                    "Cannot resolve workspace root for bootstrap test",
                ));
            },
        };
        let source_schema = workspace.join(ksp_config_lib::DEFAULT_SCHEMA_PATH).join(ksp_config_lib::DEFAULT_STD_LOGGING_SCHEMA_FILENAME);
        let destination_schema = schema_root.join(ksp_config_lib::DEFAULT_STD_LOGGING_SCHEMA_FILENAME);
        let copied = std::fs::copy(source_schema.as_path(), destination_schema.as_path());
        if let std::result::Result::Err(error) = copied {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(crate::ERROR_CODE_APP_STATE_INVALID, "Cannot copy bootstrap test Logging schema").with_source(error),
            );
        }
        return std::result::Result::Ok(Self { root, config_root, schema_root });
    }

    fn management(&self) -> ksp_core_lib::Result<ksp_config_lib::ConfigManagement> {
        let bootstrap = ksp_config_lib::ConfigBootstrapOptions::from_paths(self.config_root.as_path(), self.schema_root.as_path());
        let bootstrap = match bootstrap {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let registry = ksp_config_lib::ConfigFileRegistry::defaults();
        let registry = match registry {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        return std::result::Result::Ok(ksp_config_lib::ConfigManagement::new(ksp_config_lib::ConfigDocumentEngine::new(bootstrap, registry)));
    }
}

impl std::ops::Drop for BootstrapFixture {
    fn drop(&mut self) {
        let cleanup = std::fs::remove_dir_all(self.root.as_path());
        match cleanup {
            std::result::Result::Ok(()) | std::result::Result::Err(_) => {},
        }
    }
}