use axum::Router;
use axum::routing::{get, post, put};
use uuid::Uuid;

use erp_core::error::AppResult;
use erp_core::events::EventBus;
use erp_core::module::ErpModule;

use crate::handler::{
    dictionary_handler, language_handler, menu_handler, numbering_handler, setting_handler,
    theme_handler,
};

/// Config module implementing the `ErpModule` trait.
///
/// Manages system configuration: dictionaries, menus, settings,
/// numbering rules, languages, and themes.
pub struct ConfigModule;

impl ConfigModule {
    pub fn new() -> Self {
        Self
    }

    /// Build protected (authenticated) routes for the config module.
    pub fn protected_routes<S>() -> Router<S>
    where
        crate::config_state::ConfigState: axum::extract::FromRef<S>,
        S: Clone + Send + Sync + 'static,
    {
        Router::new()
            // Dictionary routes
            .route(
                "/config/dictionaries",
                get(dictionary_handler::list_dictionaries)
                    .post(dictionary_handler::create_dictionary),
            )
            .route(
                "/config/dictionaries/{id}",
                put(dictionary_handler::update_dictionary)
                    .delete(dictionary_handler::delete_dictionary),
            )
            .route(
                "/config/dictionaries/items",
                get(dictionary_handler::list_items_by_code),
            )
            .route(
                "/config/dictionaries/{dict_id}/items",
                post(dictionary_handler::create_item),
            )
            .route(
                "/config/dictionaries/{dict_id}/items/{item_id}",
                put(dictionary_handler::update_item)
                    .delete(dictionary_handler::delete_item),
            )
            // Menu routes
            .route(
                "/config/menus",
                get(menu_handler::get_menus).put(menu_handler::batch_save_menus),
            )
            // Setting routes
            .route(
                "/config/settings/{key}",
                get(setting_handler::get_setting)
                    .put(setting_handler::update_setting)
                    .delete(setting_handler::delete_setting),
            )
            // Numbering rule routes
            .route(
                "/config/numbering-rules",
                get(numbering_handler::list_numbering_rules)
                    .post(numbering_handler::create_numbering_rule),
            )
            .route(
                "/config/numbering-rules/{id}",
                put(numbering_handler::update_numbering_rule)
                    .delete(numbering_handler::delete_numbering_rule),
            )
            .route(
                "/config/numbering-rules/{id}/generate",
                post(numbering_handler::generate_number),
            )
            // Theme routes
            .route(
                "/config/themes",
                get(theme_handler::get_theme).put(theme_handler::update_theme),
            )
            // Language routes
            .route(
                "/config/languages",
                get(language_handler::list_languages),
            )
            .route(
                "/config/languages/{code}",
                put(language_handler::update_language),
            )
    }
}

impl Default for ConfigModule {
    fn default() -> Self {
        Self::new()
    }
}

#[async_trait::async_trait]
impl ErpModule for ConfigModule {
    fn name(&self) -> &str {
        "config"
    }

    fn version(&self) -> &str {
        env!("CARGO_PKG_VERSION")
    }

    fn dependencies(&self) -> Vec<&str> {
        vec!["auth"]
    }

    fn register_routes(&self, router: Router) -> Router {
        router
    }

    fn register_event_handlers(&self, _bus: &EventBus) {}

    async fn on_tenant_created(&self, _tenant_id: Uuid) -> AppResult<()> {
        Ok(())
    }

    async fn on_tenant_deleted(&self, _tenant_id: Uuid) -> AppResult<()> {
        Ok(())
    }

    fn as_any(&self) -> &dyn std::any::Any {
        self
    }
}