use oiseau::{cache::Cache, query_row, query_rows};
use crate::model::{auth::User, links::Link, permissions::FinePermission, Error, Result};
use crate::{auto_method, DataManager};
use oiseau::{PostgresRow, execute, get, params};

impl DataManager {
    /// Get a [`Link`] from an SQL row.
    pub(crate) fn get_link_from_row(x: &PostgresRow) -> Link {
        Link {
            id: get!(x->0(i64)) as usize,
            created: get!(x->1(i64)) as usize,
            owner: get!(x->2(i64)) as usize,
            label: get!(x->3(String)),
            href: get!(x->4(String)),
            upload_id: get!(x->5(i64)) as usize,
            clicks: get!(x->6(i32)) as usize,
            position: get!(x->7(i32)) as usize,
        }
    }

    auto_method!(get_link_by_id()@get_link_from_row -> "SELECT * FROM links WHERE id = $1" --name="link" --returns=Link --cache-key-tmpl="atto.link:{}");

    /// Get links by `owner`.
    pub async fn get_links_by_owner(&self, owner: usize) -> Result<Vec<Link>> {
        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 links WHERE owner = $1 ORDER BY position DESC",
            &[&(owner as i64)],
            |x| { Self::get_link_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    /// Get links by `owner`.
    pub async fn get_links_by_owner_count(&self, owner: usize) -> Result<i32> {
        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 COUNT(*)::int FROM links WHERE owner = $1",
            &[&(owner as i64)],
            |x| Ok(x.get::<usize, i32>(0))
        );

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

        Ok(res.unwrap())
    }

    const MAXIMUM_FREE_LINKS: usize = 10;
    const MAXIMUM_SUPPORTER_LINKS: usize = 20;

    /// Create a new link in the database.
    ///
    /// # Arguments
    /// * `data` - a mock [`Link`] object to insert
    pub async fn create_link(&self, data: Link, user: &User) -> Result<Link> {
        if !user.permissions.check(FinePermission::SUPPORTER) {
            if (self.get_links_by_owner_count(user.id).await? as usize) >= Self::MAXIMUM_FREE_LINKS
            {
                return Err(Error::MiscError(
                    "You already have the maximum number of links you can create".to_string(),
                ));
            }
        } else if !user.permissions.check(FinePermission::MANAGE_USERS) {
            if (self.get_links_by_owner_count(user.id).await? as usize)
                >= Self::MAXIMUM_SUPPORTER_LINKS
            {
                return Err(Error::MiscError(
                    "You already have the maximum number of links you can create".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 links VALUES ($1, $2, $3, $4, $5, $6, $7, $8)",
            params![
                &(data.id as i64),
                &(data.created as i64),
                &(data.owner as i64),
                &data.label,
                &data.href,
                &(data.upload_id as i64),
                &(data.clicks as i32),
                &(data.position as i32),
            ]
        );

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

        Ok(data)
    }

    pub async fn delete_link(&self, id: usize) -> Result<()> {
        let y = self.get_link_by_id(id).await?;

        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 links WHERE id = $1", &[&(id as i64)]);

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

        // delete upload
        if y.upload_id != 0 {
            self.delete_upload(id).await?;
        }

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

    auto_method!(update_link_label(&str) -> "UPDATE links SET label = $1 WHERE id = $2" --cache-key-tmpl="atto.link:{}");
    auto_method!(update_link_href(&str) -> "UPDATE links SET href = $1 WHERE id = $2" --cache-key-tmpl="atto.link:{}");
    auto_method!(update_link_upload_id(i64) -> "UPDATE links SET upload_id = $1 WHERE id = $2" --cache-key-tmpl="atto.link:{}");
    auto_method!(update_link_position(i32) -> "UPDATE links SET position = $1 WHERE id = $2" --cache-key-tmpl="atto.link:{}");
    auto_method!(incr_link_clicks() -> "UPDATE links SET clicks = $1 WHERE id = $2" --cache-key-tmpl="atto.link:{}" --incr);
}