mod api_error;
pub mod database;
pub mod error;
pub mod events;
pub mod health;
pub mod imaging;
pub mod metrics;
pub mod middleware;
pub mod notify;
pub mod oauth_client;
pub mod pagination;
pub mod push;
pub mod redis;
pub mod rest;
pub mod serde_datetime;
pub mod serde_patch;
pub mod storage;
pub mod telemetry;
pub mod urls;
pub mod users;

use std::sync::Arc;

pub use api_error::is_unique_violation;
use config::AppConfig;
pub use database::{AppDatabase, DatabaseRole};
pub use error::ExportError;
pub use redis::{AppRedis, RedisConnection};
pub use storage::AppStorage;
pub use urls::{resolve_space_image_url, resolve_user_avatar_url};

#[derive(Clone)]
pub struct AppState {
    pub database: Arc<AppDatabase>,
    pub redis: AppRedis,
    pub storage: Arc<AppStorage>,
    pub config: AppConfig,
    pub kenauth: Option<Arc<kenauth::KenAuthClient>>,
    pub email_rpc: Option<Arc<kenauth::KenAuthClient>>,
}

impl AppState {
    pub async fn load() -> Result<Self, ExportError> {
        let config =
            config::AppConfig::load().map_err(|e| ExportError::InvalidConfig(e.to_string()))?;
        Self::with_config(config).await
    }

    pub async fn with_config(config: AppConfig) -> Result<Self, ExportError> {
        let database = Arc::new(AppDatabase::connect(config.database.clone()).await?);
        Self::with_identity(config, database, None).await
    }

    pub async fn with_identity(
        config: AppConfig,
        database: Arc<AppDatabase>,
        identity: Option<Arc<kenauth::KenAuthClient>>,
    ) -> Result<Self, ExportError> {
        let mut redis = AppRedis::connect(config.redis.clone()).await?;
        // 入队点遍布各业务 crate，但只有这里有配置：把开关写进句柄，让
        // `export::push::enqueue` 能自己判断该不该产生任务。
        redis.set_push_enabled(config.push.enabled);
        let storage = Arc::new(AppStorage::connect(config.s3.clone())?);

        if config.oauth.enabled && identity.is_none() {
            return Err(ExportError::InvalidConfig(
                "oauth requires the in-process identity service".to_owned(),
            ));
        }
        let kenauth = identity;
        if let Some(client) = &kenauth {
            oauth_client::install(client.clone());
        }
        let email_rpc = kenauth.clone();

        Ok(Self {
            database,
            redis,
            storage,
            config,
            kenauth,
            email_rpc,
        })
    }
}