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

//! Config and Logging bootstrap for the desktop application.

pub(crate) struct LoggingStartup {
    pub(crate) guard: ksp_logging_lib::LoggingGuard,
    pub(crate) active_profile_id: std::option::Option<String>,
    pub(crate) selection_source: String,
    pub(crate) fallback_active: bool,
    pub(crate) startup_diagnostic: std::option::Option<crate::CommandErrorDto>,
}

pub(crate) fn config_management(arguments: &[std::ffi::OsString]) -> ksp_core_lib::Result<ksp_config_lib::ConfigManagement> {
    let bootstrap = ksp_config_lib::ConfigBootstrapOptions::from_args(arguments);
    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::from_args(arguments);
    let registry = match registry {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let engine = ksp_config_lib::ConfigDocumentEngine::new(bootstrap, registry);
    return std::result::Result::Ok(ksp_config_lib::ConfigManagement::new(engine));
}

pub(crate) fn initialize_logging(
    management: &ksp_config_lib::ConfigManagement,
    runtime_identity: &ksp_logging_lib::LoggingRuntimeIdentity,
) -> ksp_core_lib::Result<LoggingStartup> {
    let environment = ksp_config_lib::ConfigEnvironment::load();
    let environment = match environment {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return initialize_fallback_logging(error, runtime_identity),
    };
    let resolved = management.engine().load_resolved_logging_config(std::option::Option::None, &environment);
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return initialize_fallback_logging(error, runtime_identity),
    };
    let active_profile_id = resolved.profile_id().to_owned();
    let settings = resolved.into_settings();
    let guard = ksp_logging_lib::initialize_with_identity(&settings, runtime_identity);
    return match guard {
        std::result::Result::Ok(guard) => {
            ksp_logging_lib::info!(
                target: crate::TRACING_TARGET,
                domain = crate::TRACING_DOMAIN_BOOTSTRAP,
                active_profile = active_profile_id.as_str(),
                "initialized Config Desk logging from managed configuration"
            );
            std::result::Result::Ok(LoggingStartup {
                guard,
                active_profile_id: std::option::Option::Some(active_profile_id),
                selection_source: "default_profile".to_owned(),
                fallback_active: false,
                startup_diagnostic: std::option::Option::None,
            })
        },
        std::result::Result::Err(error) => initialize_fallback_logging(error, runtime_identity),
    };
}

fn initialize_fallback_logging(
    initial_error: ksp_core_lib::Error,
    runtime_identity: &ksp_logging_lib::LoggingRuntimeIdentity,
) -> ksp_core_lib::Result<LoggingStartup> {
    let diagnostic = crate::CommandErrorDto::from_error(&initial_error);
    let settings = fallback_logging_settings();
    let guard = ksp_logging_lib::initialize_with_identity(&settings, runtime_identity);
    let guard = match guard {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(fallback_error) => {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(crate::ERROR_CODE_LOGGING_BOOTSTRAP_FAILED, "Cannot initialize Config Desk fallback Logging runtime")
                    .with_context("initial_error_domain", initial_error.code().domain())
                    .with_context("initial_error_code", initial_error.code().code())
                    .with_source(fallback_error),
            );
        },
    };
    ksp_logging_lib::warn!(
        target: crate::TRACING_TARGET,
        domain = crate::TRACING_DOMAIN_BOOTSTRAP,
        error_domain = diagnostic.domain.as_str(),
        error_code = diagnostic.code.as_str(),
        "managed Logging configuration is unavailable; using transient in-memory fallback"
    );
    return std::result::Result::Ok(LoggingStartup {
        guard,
        active_profile_id: std::option::Option::None,
        selection_source: "fallback".to_owned(),
        fallback_active: true,
        startup_diagnostic: std::option::Option::Some(diagnostic),
    });
}

pub(crate) fn fallback_logging_settings() -> ksp_logging_lib::LoggingSettings {
    return ksp_logging_lib::LoggingSettings::new(
        ksp_logging_lib::LogFilterLevel::Info,
        ksp_logging_lib::SpanEvents::Off,
        std::option::Option::Some(ksp_logging_lib::ConsoleSettings::stderr()),
        std::vec::Vec::new(),
    );
}

#[cfg(test)]
#[path = "../unit_tests/bootstrap.rs"]
mod tests;