use crate::{
    database::NAME_REGEX,
    model::{
        auth::User,
        littleweb::{Domain, DomainData, DomainTld},
        permissions::{FinePermission, SecondaryPermission},
        Error, Result,
    },
};
use crate::{auto_method, DataManager};
use oiseau::{cache::Cache, execute, get, params, query_row, query_rows, PostgresRow};

impl DataManager {
    /// Get a [`Domain`] from an SQL row.
    pub(crate) fn get_domain_from_row(x: &PostgresRow) -> Domain {
        Domain {
            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)),
            tld: (get!(x->4(String)).as_str()).into(),
            data: serde_json::from_str(&get!(x->5(String))).unwrap(),
        }
    }

    auto_method!(get_domain_by_id(usize as i64)@get_domain_from_row -> "SELECT * FROM domains WHERE id = $1" --name="domain" --returns=Domain --cache-key-tmpl="atto.domain:{}");

    /// Get a domain given its name and TLD.
    ///
    /// # Arguments
    /// * `name`
    /// * `tld`
    pub async fn get_domain_by_name_tld(&self, name: &str, tld: &DomainTld) -> Result<Domain> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        let res = query_row!(
            &conn,
            "SELECT * FROM domains WHERE name = $1 AND tld = $2",
            &[&name, &tld.to_string()],
            |x| { Ok(Self::get_domain_from_row(x)) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all domains by user.
    ///
    /// # Arguments
    /// * `id` - the ID of the user to fetch domains for
    pub async fn get_domains_by_user(&self, id: usize) -> Result<Vec<Domain>> {
        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 domains WHERE owner = $1 ORDER BY created DESC",
            &[&(id as i64)],
            |x| { Self::get_domain_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    const MAXIMUM_FREE_DOMAINS: usize = 5;

    /// Create a new domain in the database.
    ///
    /// # Arguments
    /// * `data` - a mock [`Domain`] object to insert
    pub async fn create_domain(&self, data: Domain) -> Result<Domain> {
        // 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 domains
        let owner = self.get_user_by_id(data.owner).await?;

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

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

        // check name
        let regex = regex::RegexBuilder::new(NAME_REGEX)
            .multi_line(true)
            .build()
            .unwrap();

        if regex.captures(&data.name).is_some() {
            return Err(Error::MiscError(
                "Domain name contains invalid characters".to_string(),
            ));
        }

        // check for existing
        if self
            .get_domain_by_name_tld(&data.name, &data.tld)
            .await
            .is_ok()
        {
            return Err(Error::MiscError(
                "Domain + TLD already in use. Maybe try another TLD!".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 domains VALUES ($1, $2, $3, $4, $5, $6)",
            params![
                &(data.id as i64),
                &(data.created as i64),
                &(data.owner as i64),
                &data.name,
                &data.tld.to_string(),
                &serde_json::to_string(&data.data).unwrap(),
            ]
        );

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

        Ok(data)
    }

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

        // check user permission
        if user.id != domain.owner
            && !user
                .secondary_permissions
                .check(SecondaryPermission::MANAGE_DOMAINS)
        {
            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 domains WHERE id = $1", &[&(id as i64)]);

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

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

    auto_method!(update_domain_data(Vec<(String, DomainData)>)@get_domain_by_id:FinePermission::MANAGE_USERS; -> "UPDATE domains SET data = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.domain:{}");
}