pub mod api;
pub mod auth;
pub mod db;
pub mod env;
pub mod executor;
pub mod rpc;

#[cfg(test)]
mod tests;

use anyhow::anyhow;
use aws_config::{BehaviorVersion, Region};
use axum::{http::StatusCode, response::IntoResponse};
use db::Database;
use executor::Executor;
use serde::Deserialize;
use std::{path::PathBuf, sync::Arc};
use util::ResultExt;

pub type Result<T, E = Error> = std::result::Result<T, E>;

pub enum Error {
    Http(StatusCode, String),
    Database(sea_orm::error::DbErr),
    Internal(anyhow::Error),
}

impl From<anyhow::Error> for Error {
    fn from(error: anyhow::Error) -> Self {
        Self::Internal(error)
    }
}

impl From<sea_orm::error::DbErr> for Error {
    fn from(error: sea_orm::error::DbErr) -> Self {
        Self::Database(error)
    }
}

impl From<axum::Error> for Error {
    fn from(error: axum::Error) -> Self {
        Self::Internal(error.into())
    }
}

impl From<hyper::Error> for Error {
    fn from(error: hyper::Error) -> Self {
        Self::Internal(error.into())
    }
}

impl From<serde_json::Error> for Error {
    fn from(error: serde_json::Error) -> Self {
        Self::Internal(error.into())
    }
}

impl IntoResponse for Error {
    fn into_response(self) -> axum::response::Response {
        match self {
            Error::Http(code, message) => {
                log::error!("HTTP error {}: {}", code, &message);
                (code, message).into_response()
            }
            Error::Database(error) => {
                log::error!(
                    "HTTP error {}: {:?}",
                    StatusCode::INTERNAL_SERVER_ERROR,
                    &error
                );
                (StatusCode::INTERNAL_SERVER_ERROR, format!("{}", &error)).into_response()
            }
            Error::Internal(error) => {
                log::error!(
                    "HTTP error {}: {:?}",
                    StatusCode::INTERNAL_SERVER_ERROR,
                    &error
                );
                (StatusCode::INTERNAL_SERVER_ERROR, format!("{}", &error)).into_response()
            }
        }
    }
}

impl std::fmt::Debug for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::Http(code, message) => (code, message).fmt(f),
            Error::Database(error) => error.fmt(f),
            Error::Internal(error) => error.fmt(f),
        }
    }
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::Http(code, message) => write!(f, "{code}: {message}"),
            Error::Database(error) => error.fmt(f),
            Error::Internal(error) => error.fmt(f),
        }
    }
}

impl std::error::Error for Error {}

#[derive(Deserialize)]
pub struct Config {
    pub http_port: u16,
    pub database_url: String,
    pub database_max_connections: u32,
    pub api_token: String,
    pub clickhouse_url: Option<String>,
    pub clickhouse_user: Option<String>,
    pub clickhouse_password: Option<String>,
    pub clickhouse_database: Option<String>,
    pub invite_link_prefix: String,
    pub live_kit_server: Option<String>,
    pub live_kit_key: Option<String>,
    pub live_kit_secret: Option<String>,
    pub rust_log: Option<String>,
    pub log_json: Option<bool>,
    pub blob_store_url: Option<String>,
    pub blob_store_region: Option<String>,
    pub blob_store_access_key: Option<String>,
    pub blob_store_secret_key: Option<String>,
    pub blob_store_bucket: Option<String>,
    pub zed_environment: Arc<str>,
    pub zed_client_checksum_seed: Option<String>,
}

impl Config {
    pub fn is_development(&self) -> bool {
        self.zed_environment == "development".into()
    }
}

#[derive(Default, Deserialize)]
pub struct MigrateConfig {
    pub database_url: String,
    pub migrations_path: Option<PathBuf>,
}

pub struct AppState {
    pub db: Arc<Database>,
    pub live_kit_client: Option<Arc<dyn live_kit_server::api::Client>>,
    pub blob_store_client: Option<aws_sdk_s3::Client>,
    pub clickhouse_client: Option<clickhouse::Client>,
    pub config: Config,
}

impl AppState {
    pub async fn new(config: Config) -> Result<Arc<Self>> {
        let mut db_options = db::ConnectOptions::new(config.database_url.clone());
        db_options.max_connections(config.database_max_connections);
        let mut db = Database::new(db_options, Executor::Production).await?;
        db.initialize_notification_kinds().await?;

        let live_kit_client = if let Some(((server, key), secret)) = config
            .live_kit_server
            .as_ref()
            .zip(config.live_kit_key.as_ref())
            .zip(config.live_kit_secret.as_ref())
        {
            Some(Arc::new(live_kit_server::api::LiveKitClient::new(
                server.clone(),
                key.clone(),
                secret.clone(),
            )) as Arc<dyn live_kit_server::api::Client>)
        } else {
            None
        };

        let this = Self {
            db: Arc::new(db),
            live_kit_client,
            blob_store_client: build_blob_store_client(&config).await.log_err(),
            clickhouse_client: build_clickhouse_client(&config).log_err(),
            config,
        };
        Ok(Arc::new(this))
    }
}

async fn build_blob_store_client(config: &Config) -> anyhow::Result<aws_sdk_s3::Client> {
    let keys = aws_sdk_s3::config::Credentials::new(
        config
            .blob_store_access_key
            .clone()
            .ok_or_else(|| anyhow!("missing blob_store_access_key"))?,
        config
            .blob_store_secret_key
            .clone()
            .ok_or_else(|| anyhow!("missing blob_store_secret_key"))?,
        None,
        None,
        "env",
    );

    let s3_config = aws_config::defaults(BehaviorVersion::latest())
        .endpoint_url(
            config
                .blob_store_url
                .as_ref()
                .ok_or_else(|| anyhow!("missing blob_store_url"))?,
        )
        .region(Region::new(
            config
                .blob_store_region
                .clone()
                .ok_or_else(|| anyhow!("missing blob_store_region"))?,
        ))
        .credentials_provider(keys)
        .load()
        .await;

    Ok(aws_sdk_s3::Client::new(&s3_config))
}

fn build_clickhouse_client(config: &Config) -> anyhow::Result<clickhouse::Client> {
    Ok(clickhouse::Client::default()
        .with_url(
            config
                .clickhouse_url
                .as_ref()
                .ok_or_else(|| anyhow!("missing clickhouse_url"))?,
        )
        .with_user(
            config
                .clickhouse_user
                .as_ref()
                .ok_or_else(|| anyhow!("missing clickhouse_user"))?,
        )
        .with_password(
            config
                .clickhouse_password
                .as_ref()
                .ok_or_else(|| anyhow!("missing clickhouse_password"))?,
        )
        .with_database(
            config
                .clickhouse_database
                .as_ref()
                .ok_or_else(|| anyhow!("missing clickhouse_database"))?,
        ))
}