// file: crates/ksp-app-raw-transaction-ingest-desk/src/tauri.rs
// version: 9

//! Tauri runtime assembly for the KSP Raw Transaction Ingest desktop application.

use tauri::Emitter; // rust-rules: trait-import
use tauri::Manager; // rust-rules: trait-import

/// Runs the Raw Transaction Ingest desktop application.
#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run(arguments: &[std::ffi::OsString]) -> ksp_core_lib::Result<()> {
    let context = tauri::generate_context!();
    let runtime_layout = configure_packaged_runtime(&context);
    if let std::result::Result::Err(error) = runtime_layout {
        return std::result::Result::Err(error);
    }
    let app_state = crate::AppState::initialize(arguments);
    let app_state = match app_state {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let mut builder = tauri::Builder::default();
    builder = builder.manage(app_state);
    builder = builder.plugin(tauri_plugin_tracing::Builder::new().build::<tauri::Wry>());
    builder = configure_commands(builder);
    builder = configure_window_events(builder);
    builder = builder.setup(|app| {
        let splash = crate::require_splash_window(app);
        if let std::result::Result::Err(error) = splash {
            return std::result::Result::Err(std::boxed::Box::new(error));
        }
        let main = crate::require_main_window(app);
        if let std::result::Result::Err(error) = main {
            return std::result::Result::Err(std::boxed::Box::new(error));
        }
        ksp_logging_lib::debug!(target: crate::TRACING_TARGET, domain = crate::TRACING_DOMAIN_SHELL, "Raw Transaction Ingest Desk Tauri shell setup completed");
        return std::result::Result::Ok(());
    });
    let run_result = builder.run(context);
    return match run_result {
        std::result::Result::Ok(()) => std::result::Result::Ok(()),
        std::result::Result::Err(error) => std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_RUNTIME_FAILED, "Cannot run KSP Raw Transaction Ingest Desk Tauri runtime")
                .with_context("tauri_error", error.to_string()),
        ),
    };
}

fn configure_packaged_runtime(context: &tauri::Context<tauri::Wry>) -> ksp_core_lib::Result<()> {
    if cfg!(debug_assertions) {
        return std::result::Result::Ok(());
    }
    let resource_root = tauri::utils::platform::resource_dir(context.package_info(), &tauri::Env::default());
    let resource_root = match resource_root {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_RUNTIME_FAILED, "Cannot resolve packaged Tauri resource directory")
                    .with_context("tauri_error", error.to_string()),
            );
        },
    };
    let layout = ksp_config_lib::prepare_packaged_runtime(resource_root.as_path());
    let layout = match layout {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let working_directory = std::env::set_current_dir(layout.runtime_root());
    return match working_directory {
        std::result::Result::Ok(()) => std::result::Result::Ok(()),
        std::result::Result::Err(error) => std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_RUNTIME_FAILED, "Cannot activate packaged KSP runtime directory")
                .with_context("runtime_root", layout.runtime_root().to_string_lossy().into_owned())
                .with_source(error),
        ),
    };
}

#[allow(clippy::question_mark_used)] // Tauri generates the question-mark operator internally for async command dispatch.
fn configure_commands(builder: tauri::Builder<tauri::Wry>) -> tauri::Builder<tauri::Wry> {
    return builder.invoke_handler(tauri::generate_handler![
        emit_frontend_log,
        get_route_foundation,
        get_route_inventory,
        get_route_monitoring,
        get_runtime_status,
        splash_frontend_ready,
        start_route,
        stop_route,
        validate_route_start
    ]);
}

fn configure_window_events(builder: tauri::Builder<tauri::Wry>) -> tauri::Builder<tauri::Wry> {
    return builder.on_window_event(|window, event| {
        if window.label() != "main" {
            return;
        }
        if let tauri::WindowEvent::CloseRequested { api, .. } = event {
            api.prevent_close();
            let app_handle = window.app_handle().clone();
            let state = app_handle.state::<crate::AppState>();
            let begin = state.begin_shutdown();
            let begin = match begin {
                std::result::Result::Ok(value) => value,
                std::result::Result::Err(error) => {
                    ksp_logging_lib::warn!(
                        target: crate::TRACING_TARGET,
                        domain = crate::TRACING_DOMAIN_WINDOWS,
                        error_domain = error.code().domain(),
                        error_code = error.code().code(),
                        "Raw Transaction Ingest Desk could not enter graceful shutdown; exiting after safe error projection"
                    );
                    app_handle.exit(1);
                    return;
                },
            };
            if !begin {
                return;
            }
            ksp_logging_lib::debug!(
                target: crate::TRACING_TARGET,
                domain = crate::TRACING_DOMAIN_WINDOWS,
                "Raw Transaction Ingest Desk main-window close requested; route Start admission closed and cooperative shutdown requested"
            );
            tauri::async_runtime::spawn(async move {
                let state = app_handle.state::<crate::AppState>();
                let shutdown = state.shutdown_routes().await;
                match shutdown {
                    std::result::Result::Ok(()) => {
                        ksp_logging_lib::debug!(
                            target: crate::TRACING_TARGET,
                            domain = crate::TRACING_DOMAIN_WINDOWS,
                            "Raw Transaction Ingest Desk route and shared Store shutdown completed; exiting application"
                        );
                        app_handle.exit(0);
                    },
                    std::result::Result::Err(error) => {
                        ksp_logging_lib::warn!(
                            target: crate::TRACING_TARGET,
                            domain = crate::TRACING_DOMAIN_WINDOWS,
                            error_domain = error.code().domain(),
                            error_code = error.code().code(),
                            "Raw Transaction Ingest Desk bounded route shutdown failed; exiting application after bounded cleanup attempt"
                        );
                        app_handle.exit(1);
                    },
                }
            });
        }
    });
}

fn project_command_error(command: &'static str, domain: &'static str, error: &ksp_core_lib::Error) -> crate::CommandErrorDto {
    ksp_logging_lib::warn!(
        target: crate::TRACING_TARGET,
        domain = domain,
        command = command,
        error_domain = error.code().domain(),
        error_code = error.code().code(),
        "Raw Transaction Ingest Desk Tauri command failed"
    );
    return crate::CommandErrorDto::from_error(error);
}

#[tauri::command]
fn emit_frontend_log(payload: crate::FrontendLogPayloadDto) -> std::result::Result<(), crate::CommandErrorDto> {
    let result = crate::emit_frontend_log_event(payload);
    return match result {
        std::result::Result::Ok(()) => std::result::Result::Ok(()),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("emit_frontend_log", crate::TRACING_DOMAIN_FRONTEND, &error)),
    };
}

#[tauri::command]
fn get_route_foundation(state: tauri::State<'_, crate::AppState>) -> crate::RawIngestRouteFoundationDto {
    return state.route_foundation();
}

#[tauri::command]
fn get_route_inventory(state: tauri::State<'_, crate::AppState>) -> std::result::Result<crate::RawIngestRouteInventoryDto, crate::CommandErrorDto> {
    let result = state.route_inventory();
    return match result {
        std::result::Result::Ok(value) => std::result::Result::Ok(value),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("get_route_inventory", crate::TRACING_DOMAIN_INVENTORY, &error)),
    };
}

#[tauri::command]
fn get_route_monitoring(
    state: tauri::State<'_, crate::AppState>,
) -> std::result::Result<std::vec::Vec<crate::RawIngestRouteMonitoringDto>, crate::CommandErrorDto> {
    let result = state.route_monitoring();
    return match result {
        std::result::Result::Ok(value) => std::result::Result::Ok(value),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("get_route_monitoring", crate::TRACING_DOMAIN_ROUTE_RUNTIME, &error)),
    };
}

#[tauri::command]
fn get_runtime_status(state: tauri::State<'_, crate::AppState>) -> std::result::Result<crate::ShellStatusDto, crate::CommandErrorDto> {
    let result = state.shell_status();
    return match result {
        std::result::Result::Ok(value) => std::result::Result::Ok(value),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("get_runtime_status", crate::TRACING_DOMAIN_SHELL, &error)),
    };
}

#[tauri::command]
async fn splash_frontend_ready(
    app: tauri::AppHandle,
    webview_window: tauri::WebviewWindow,
    state: tauri::State<'_, crate::AppState>,
) -> std::result::Result<(), crate::CommandErrorDto> {
    let result = crate::splash_frontend_ready_service(app, webview_window, &state).await;
    return match result {
        std::result::Result::Ok(()) => std::result::Result::Ok(()),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("splash_frontend_ready", crate::TRACING_DOMAIN_WINDOWS, &error)),
    };
}

#[tauri::command]
async fn start_route(
    app: tauri::AppHandle,
    request: crate::RawIngestRouteStartRequestDto,
    state: tauri::State<'_, crate::AppState>,
) -> std::result::Result<crate::RawIngestRouteRuntimeDto, crate::CommandErrorDto> {
    let launch = state.start_route(&request).await;
    let launch = match launch {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => {
            return std::result::Result::Err(project_command_error("start_route", crate::TRACING_DOMAIN_ROUTE_RUNTIME, &error));
        },
    };
    let acknowledgement = launch.acknowledgement();
    let monitoring_identity = launch.monitoring_identity();
    let monitoring_source = launch.monitoring_source();
    let monitoring_app = app.clone();
    let monitoring_task = tauri::async_runtime::spawn(async move {
        monitor_route_status(monitoring_app, monitoring_identity, monitoring_source).await;
    });
    std::mem::drop(monitoring_task);
    let terminal_task = tauri::async_runtime::spawn(async move {
        launch.monitor().await;
    });
    std::mem::drop(terminal_task);
    return std::result::Result::Ok(acknowledgement);
}

const ROUTE_MONITORING_MIN_EMIT_INTERVAL_MS: u64 = 500;

async fn monitor_route_status(
    app: tauri::AppHandle,
    runtime: crate::RawIngestRouteRuntimeDto,
    source: ksp_worker_raw_transaction_ingest_lib::RawTransactionIngestSnapshotSource,
) {
    let mut snapshot = source.current();
    loop {
        let projected = crate::project_route_monitoring(&runtime, &snapshot);
        match projected {
            std::result::Result::Ok(status) => {
                let main = app.get_webview_window("main");
                if let std::option::Option::Some(window) = main {
                    let emitted = window.emit(crate::RAW_INGEST_ROUTE_STATUS_EVENT_NAME, status);
                    if emitted.is_err() {
                        ksp_logging_lib::warn!(
                            target: crate::TRACING_TARGET,
                            domain = crate::TRACING_DOMAIN_ROUTE_RUNTIME,
                            "Raw Transaction Ingest Desk could not emit latest-value route monitoring status"
                        );
                    }
                }
            },
            std::result::Result::Err(error) => {
                ksp_logging_lib::warn!(
                    target: crate::TRACING_TARGET,
                    domain = crate::TRACING_DOMAIN_ROUTE_RUNTIME,
                    error_domain = error.code().domain(),
                    error_code = error.code().code(),
                    "Raw Transaction Ingest Desk could not project latest-value route monitoring status"
                );
            },
        }
        if snapshot.worker_snapshot().state().is_terminal() {
            return;
        }
        let observed = snapshot.worker_snapshot().sequence();
        snapshot = source.wait_for_change(observed).await;
        if !snapshot.worker_snapshot().state().is_terminal() {
            tokio::time::sleep(std::time::Duration::from_millis(ROUTE_MONITORING_MIN_EMIT_INTERVAL_MS)).await;
            snapshot = source.current();
        }
    }
}

#[tauri::command]
async fn stop_route(
    request: crate::RawIngestRouteStopRequestDto,
    state: tauri::State<'_, crate::AppState>,
) -> std::result::Result<crate::RawIngestRouteRuntimeDto, crate::CommandErrorDto> {
    let result = state.stop_route(&request).await;
    return match result {
        std::result::Result::Ok(value) => std::result::Result::Ok(value),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("stop_route", crate::TRACING_DOMAIN_ROUTE_RUNTIME, &error)),
    };
}

#[tauri::command]
async fn validate_route_start(
    request: crate::RawIngestRouteStartRequestDto,
    state: tauri::State<'_, crate::AppState>,
) -> std::result::Result<crate::RawIngestRouteStartValidationDto, crate::CommandErrorDto> {
    let result = state.validate_route_start(&request);
    return match result {
        std::result::Result::Ok(value) => std::result::Result::Ok(value),
        std::result::Result::Err(error) => std::result::Result::Err(project_command_error("validate_route_start", crate::TRACING_DOMAIN_ROUTE_START, &error)),
    };
}