use crate::model::{
    auth::User,
    littleweb::{Service, ServiceFsEntry},
    permissions::{FinePermission, SecondaryPermission},
    Error, Result,
};
use crate::{auto_method, DataManager};
use oiseau::{cache::Cache, execute, get, params, query_rows, PostgresRow};

impl DataManager {
    /// Get a [`Service`] from an SQL row.
    pub(crate) fn get_service_from_row(x: &PostgresRow) -> Service {
        Service {
            id: get!(x->0(i64)) as usize,
            created: get!(x->1(i64)) as usize,
            owner: get!(x->2(i64)) as usize,
            name: get!(x->3(String)),
            files: serde_json::from_str(&get!(x->4(String))).unwrap(),
        }
    }

    auto_method!(get_service_by_id(usize as i64)@get_service_from_row -> "SELECT * FROM services WHERE id = $1" --name="service" --returns=Service --cache-key-tmpl="atto.service:{}");

    /// Get all services by user.
    ///
    /// # Arguments
    /// * `id` - the ID of the user to fetch services for
    pub async fn get_services_by_user(&self, id: usize) -> Result<Vec<Service>> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_rows!(
            &conn,
            "SELECT * FROM services WHERE owner = $1 ORDER BY created DESC",
            &[&(id as i64)],
            |x| { Self::get_service_from_row(x) }
        );

        if res.is_err() {
            return Err(Error::GeneralNotFound("service".to_string()));
        }

        Ok(res.unwrap())
    }

    const MAXIMUM_FREE_SERVICES: usize = 10;

    /// Create a new service in the database.
    ///
    /// # Arguments
    /// * `data` - a mock [`Service`] object to insert
    pub async fn create_service(&self, data: Service) -> Result<Service> {
        // check values
        if data.name.len() < 2 {
            return Err(Error::DataTooShort("name".to_string()));
        } else if data.name.len() > 128 {
            return Err(Error::DataTooLong("name".to_string()));
        }

        // check number of services
        let owner = self.get_user_by_id(data.owner).await?;

        if !owner.permissions.check(FinePermission::SUPPORTER) {
            let services = self.get_services_by_user(data.owner).await?;

            if services.len() >= Self::MAXIMUM_FREE_SERVICES {
                return Err(Error::MiscError(
                    "You already have the maximum number of services you can have".to_string(),
                ));
            }
        }

        // ...
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(
            &conn,
            "INSERT INTO services VALUES ($1, $2, $3, $4, $5)",
            params![
                &(data.id as i64),
                &(data.created as i64),
                &(data.owner as i64),
                &data.name,
                &serde_json::to_string(&data.files).unwrap(),
            ]
        );

        if let Err(e) = res {
            return Err(Error::DatabaseError(e.to_string()));
        }

        Ok(data)
    }

    pub async fn delete_service(&self, id: usize, user: &User) -> Result<()> {
        let service = self.get_service_by_id(id).await?;

        // check user permission
        if user.id != service.owner
            && !user
                .secondary_permissions
                .check(SecondaryPermission::MANAGE_SERVICES)
        {
            return Err(Error::NotAllowed);
        }

        // ...
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = execute!(&conn, "DELETE FROM services WHERE id = $1", &[&(id as i64)]);

        if let Err(e) = res {
            return Err(Error::DatabaseError(e.to_string()));
        }

        // ...
        self.0.1.remove(format!("atto.service:{}", id)).await;
        Ok(())
    }

    auto_method!(update_service_name(&str)@get_service_by_id:FinePermission::MANAGE_USERS; -> "UPDATE services SET name = $1 WHERE id = $2" --cache-key-tmpl="atto.service:{}");
    auto_method!(update_service_files(Vec<ServiceFsEntry>)@get_service_by_id:FinePermission::MANAGE_USERS; -> "UPDATE services SET files = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.service:{}");
}