use base64::{prelude::BASE64_STANDARD, Engine};
use fully_pub::fully_pub;
use anyhow::{Result, Context};
use log::info;
use minijinja::{context, Environment};
use sqlx::{Pool, Sqlite};
use crate::{models::config::{AppSecrets, Config}, router::build_router};

fn build_templating_env(config: &Config) -> Environment<'static> {
    let mut env = Environment::new();

    minijinja_embed::load_templates!(&mut env);

    env.add_global("gl", context! {
        instance => config.instance
    });
    env.add_function("encode_b64str", |bin_val: Vec<u8>| {
        BASE64_STANDARD.encode(bin_val)
    });
    env
}

#[derive(Debug)]
#[fully_pub]
/// HTTP server arguments
pub struct ServerConfig {
    listen_host: String,
    listen_port: u32,
    assets_path: String
}

#[derive(Debug, Clone)]
#[fully_pub]
pub struct AppState {
    secrets: AppSecrets,
    config: Config,
    db: Pool<Sqlite>,
    templating_env: Environment<'static>
}

pub async fn start_http_server(
    server_config: ServerConfig,
    config: Config,
    secrets: AppSecrets,
    db_pool: Pool<Sqlite>
) -> Result<()> {
    // build state
    let state = AppState {
        templating_env: build_templating_env(&config),
        config,
        secrets,
        db: db_pool
    };

    // build routes
    let services = build_router(
        &server_config,
        state.clone()
    )
        .with_state(state);

    let listen_addr = format!("{}:{}", server_config.listen_host, server_config.listen_port);
    info!("Starting web server on http://{}", &listen_addr);
    let listener = tokio::net::TcpListener::bind(listen_addr).await.unwrap();

    axum::serve(listener, services).await.context("Axum serve")?;

    Ok(())
}