use crate::{
    DataManager,
    model::{MediaUpload, UploadMetadata},
};
use oiseau::{PostgresRow, cache::Cache, execute, get, params, query_row, query_rows};
use tetratto_core::auto_method;
use tetratto_core::model::{Error, Result};

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

    auto_method!(get_upload_by_id(usize as i64)@get_upload_from_row -> "SELECT * FROM uploads WHERE id = $1" --name="upload" --returns=MediaUpload --cache-key-tmpl="atto.upload:{}");

    /// Get an upload by its ID and bucket.
    pub async fn get_upload_by_id_bucket(&self, id: usize, bucket: &str) -> Result<MediaUpload> {
        if bucket.is_empty() {
            return self.get_upload_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 = query_row!(
            &conn,
            "SELECT * FROM uploads WHERE id = $1 AND bucket = $2",
            &[&(id as i64), &bucket],
            |x| { Ok(Self::get_upload_from_row(x)) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all uploads (paginated).
    ///
    /// # Arguments
    /// * `batch` - the limit of items in each page
    /// * `page` - the page number
    pub async fn get_uploads(&self, batch: usize, page: usize) -> Result<Vec<MediaUpload>> {
        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 uploads ORDER BY created DESC LIMIT $1 OFFSET $2",
            &[&(batch as i64), &((page * batch) as i64)],
            |x| { Self::get_upload_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all uploads by their owner (paginated).
    ///
    /// # Arguments
    /// * `owner` - the ID of the owner of the upload
    /// * `batch` - the limit of items in each page
    /// * `page` - the page number
    pub async fn get_uploads_by_owner(
        &self,
        owner: usize,
        batch: usize,
        page: usize,
    ) -> Result<Vec<MediaUpload>> {
        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 uploads WHERE owner = $1 ORDER BY created DESC LIMIT $2 OFFSET $3",
            &[&(owner as i64), &(batch as i64), &((page * batch) as i64)],
            |x| { Self::get_upload_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    /// Get all uploads by their owner.
    ///
    /// # Arguments
    /// * `owner` - the ID of the owner of the upload
    pub async fn get_uploads_by_owner_all(&self, owner: usize) -> Result<Vec<MediaUpload>> {
        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 uploads WHERE owner = $1 ORDER BY created DESC",
            &[&(owner as i64)],
            |x| { Self::get_upload_from_row(x) }
        );

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

        Ok(res.unwrap())
    }

    /// Create a new upload in the database.
    ///
    /// Please note that the file must be manually written afterwards. You can use
    /// the returned [`MediaUpload`] to retrieve the correct path to write the file.
    ///
    /// # Arguments
    /// * `data` - a mock [`MediaUpload`] object to insert
    pub async fn create_upload(&self, data: MediaUpload) -> Result<MediaUpload> {
        let conn = match self.0.connect().await {
            Ok(c) => c,
            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
        };

        data.metadata.validate_kv()?;

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

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

        // return
        Ok(data)
    }

    /// Delete an upload given its `id`.
    ///
    /// # Warning
    /// It's recommended that you use [`Self::delete_upload_with_id`] instead,
    /// as the table's primary key is on `(id, bucket)`, not `id`.
    pub async fn delete_upload(&self, id: usize) -> Result<()> {
        // if !user.permissions.check(FinePermission::MANAGE_UPLOADS) {
        //     return Err(Error::NotAllowed);
        // }

        // delete file
        // it's most important that the file gets off the file system first, even
        // if there's an issue in the database
        //
        // the actual file takes up much more space than the database entry.
        let upload = self.get_upload_by_id(id).await?;
        upload.remove(&self.0.0.directory)?;

        // delete from database
        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 uploads WHERE id = $1", &[&(id as i64)]);

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

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

        // return
        Ok(())
    }

    /// Delete an upload given its `id` and `bucket`.
    pub async fn delete_upload_with_bucket(&self, id: usize, bucket: &str) -> Result<()> {
        // if !user.permissions.check(FinePermission::MANAGE_UPLOADS) {
        //     return Err(Error::NotAllowed);
        // }
        if bucket.is_empty() {
            return self.delete_upload(id).await;
        }

        // delete file
        // it's most important that the file gets off the file system first, even
        // if there's an issue in the database
        //
        // the actual file takes up much more space than the database entry.
        let upload = self.get_upload_by_id_bucket(id, bucket).await?;
        upload.remove(&self.0.0.directory)?;

        // delete from database
        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 uploads WHERE id = $1 AND bucket = $2",
            &[&(id as i64), &bucket]
        );

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

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

        // return
        Ok(())
    }

    auto_method!(update_upload_metadata(UploadMetadata) -> "UPDATE uploads SET metadata = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.upload:{}");
}