pub mod methods;
use dotenv::dotenv;
use sqlx::sqlite::{SqliteConnectOptions, SqlitePoolOptions};
use sqlx::{Error, Pool, Sqlite};
use std::env;
use std::str::FromStr;
use std::time::{SystemTime, UNIX_EPOCH};
use ldap3::{LdapConn, Scope, SearchEntry};
use tide::prelude::*;

#[derive(Debug, Deserialize, Serialize, sqlx::FromRow)]
pub struct AccountsPending {
    user: String,
    mail: String,
    name_first : String,
    name_second : String,
    auth_code : String,
    // will only last for a few hours
    expiry: i64
}

#[derive(Debug, Deserialize, Serialize, sqlx::FromRow)]
pub struct Accounts {
    user: String,
    uid_number: i64,
    discord: Option<String>,
    enabled: bool
}

pub async fn db_init(config: &Config) -> Result<Pool<Sqlite>, Error> {
    let database = &config.database;
    let pool = SqlitePoolOptions::new()
        .max_connections(5)
        .connect_with(SqliteConnectOptions::from_str(&format!("sqlite://{}", database))?.create_if_missing(true))
        .await?;

    sqlx::query(
        "CREATE TABLE IF NOT EXISTS accounts_pending (
            user text primary key,
            mail text not null,
            name_first text not null,
            name_second text not null,
            auth_code text not null,
            expiry integer not null
         )",
    )
    .execute(&pool)
    .await?;

    // this is for active use
    sqlx::query(
        "CREATE TABLE IF NOT EXISTS accounts (
            user text primary key,
            uid_number integer not null,
            discord text,
            enabled integer not null
         )",
    ).execute(&pool).await?;

    sqlx::query("CREATE INDEX IF NOT EXISTS index_uid_number ON accounts (uid_number)").execute(&pool).await?;

    update_accounts(&pool, config).await;
    
    Ok(pool)
}

pub fn get_now() -> i64 {
    if let Ok(x) = SystemTime::now().duration_since(UNIX_EPOCH) {
        x.as_secs() as i64
    } else {
        0
    }
}

#[derive(Clone)]
pub struct State {
    pub db: Pool<Sqlite>,
    pub config: Config,
}

#[derive(Debug, Clone)]
pub struct Config {
    ldap_host: String,
    ldap_admin: String,
    ldap_admin_pw: String,
    pub database: String,
    pub host_port: String,
}

pub fn get_config() -> Config {
    dotenv().ok();

    // reasonable defaults
    let mut config = Config {
        ldap_host: "".to_string(),
        ldap_admin: "".to_string(),
        ldap_admin_pw: "".to_string(),
        database: "database.db".to_string(),
        host_port: "127.0.0.1:8087".to_string(),
    };

    if let Ok(x) = env::var("LDAP_HOST") {
        config.ldap_host = x.trim().to_string();
    }
    if let Ok(x) = env::var("LDAP_ADMIN") {
        config.ldap_admin = x.trim().to_string();
    }
    if let Ok(x) = env::var("LDAP_ADMIN_PW") {
        config.ldap_admin_pw = x.trim().to_string();
    }
    if let Ok(x) = env::var("DATABASE") {
        config.database = x.trim().to_string();
    }
    if let Ok(x) = env::var("HOST_PORT") {
        config.host_port = x.trim().to_string();
    }

    config
}


async fn update_accounts(pool: &Pool<Sqlite>, config: &Config) {
    let mut ldap = LdapConn::new(&config.ldap_host).unwrap();

    ldap.simple_bind(&config.ldap_admin, &config.ldap_admin_pw).unwrap().success().unwrap();

    if let Ok(x) = ldap.search("ou=users,dc=skynet,dc=ie", Scope::OneLevel, "(objectClass=*)", vec!["uid", "uidNumber", "skDiscord", "skMemberOf"]) {

        if let Ok((rs, _res)) = x.success() {

            for entry in rs {
                let tmp = SearchEntry::construct(entry);

                let mut tmp_account = Accounts {
                    user: "".to_string(),
                    uid_number: 0,
                    discord: None,
                    enabled: false,
                };
                
                // pull out the required info
                if tmp.attrs.contains_key("uid") && !tmp.attrs["uid"].is_empty() {
                    tmp_account.user = tmp.attrs["uid"][0].clone();
                }
                if tmp.attrs.contains_key("uidNumber") && !tmp.attrs["uidNumber"].is_empty() {
                    tmp_account.uid_number = tmp.attrs["uidNumber"][0].clone().parse().unwrap_or(0);
                }
                if tmp.attrs.contains_key("skDiscord") && !tmp.attrs["skDiscord"].is_empty() {
                    tmp_account.user = tmp.attrs["skDiscord"][0].clone();
                }
                if tmp.attrs.contains_key("skMemberOf") && !tmp.attrs["skMemberOf"].is_empty() && tmp.attrs["skMemberOf"].contains(&String::from("cn=skynet-users,ou=groups,dc=skynet,dc=ie")){
                    tmp_account.enabled = true;
                }

                if tmp_account.user.len() > 0 {
                    sqlx::query_as::<_, Accounts>(
                    "
                        INSERT OR REPLACE INTO accounts (user, uid_number, discord, enabled)
                        VALUES (?1, ?2, ?3, ?4)
                        ",
                    )
                        .bind(&tmp_account.user)
                        .bind(&tmp_account.uid_number)
                        .bind(&tmp_account.discord)
                        .bind(&tmp_account.enabled)
                        .fetch_optional(pool)
                        .await
                        .ok();
                }
            }

        }
    }

    // done with ldap
    ldap.unbind().unwrap();
}