use std::io::ErrorKind;

use serde_json::Value;

use super::Cipher;
use crate::CONFIG;

db_object! {
    #[derive(Identifiable, Queryable, Insertable, Associations, AsChangeset)]
    #[table_name = "attachments"]
    #[changeset_options(treat_none_as_null="true")]
    #[belongs_to(super::Cipher, foreign_key = "cipher_uuid")]
    #[primary_key(id)]
    pub struct Attachment {
        pub id: String,
        pub cipher_uuid: String,
        pub file_name: String, // encrypted
        pub file_size: i32,
        pub akey: Option<String>,
    }
}

/// Local methods
impl Attachment {
    pub const fn new(id: String, cipher_uuid: String, file_name: String, file_size: i32, akey: Option<String>) -> Self {
        Self {
            id,
            cipher_uuid,
            file_name,
            file_size,
            akey,
        }
    }

    pub fn get_file_path(&self) -> String {
        format!("{}/{}/{}", CONFIG.attachments_folder(), self.cipher_uuid, self.id)
    }

    pub fn get_url(&self, host: &str) -> String {
        format!("{}/attachments/{}/{}", host, self.cipher_uuid, self.id)
    }

    pub fn to_json(&self, host: &str) -> Value {
        json!({
            "Id": self.id,
            "Url": self.get_url(host),
            "FileName": self.file_name,
            "Size": self.file_size.to_string(),
            "SizeName": crate::util::get_display_size(self.file_size),
            "Key": self.akey,
            "Object": "attachment"
        })
    }
}

use crate::db::DbConn;

use crate::api::EmptyResult;
use crate::error::MapResult;

/// Database methods
impl Attachment {
    pub fn save(&self, conn: &DbConn) -> EmptyResult {
        db_run! { conn:
            sqlite, mysql {
                match diesel::replace_into(attachments::table)
                    .values(AttachmentDb::to_db(self))
                    .execute(conn)
                {
                    Ok(_) => Ok(()),
                    // Record already exists and causes a Foreign Key Violation because replace_into() wants to delete the record first.
                    Err(diesel::result::Error::DatabaseError(diesel::result::DatabaseErrorKind::ForeignKeyViolation, _)) => {
                        diesel::update(attachments::table)
                            .filter(attachments::id.eq(&self.id))
                            .set(AttachmentDb::to_db(self))
                            .execute(conn)
                            .map_res("Error saving attachment")
                    }
                    Err(e) => Err(e.into()),
                }.map_res("Error saving attachment")
            }
            postgresql {
                let value = AttachmentDb::to_db(self);
                diesel::insert_into(attachments::table)
                    .values(&value)
                    .on_conflict(attachments::id)
                    .do_update()
                    .set(&value)
                    .execute(conn)
                    .map_res("Error saving attachment")
            }
        }
    }

    pub fn delete(&self, conn: &DbConn) -> EmptyResult {
        db_run! { conn: {
            crate::util::retry(
                || diesel::delete(attachments::table.filter(attachments::id.eq(&self.id))).execute(conn),
                10,
            )
            .map_res("Error deleting attachment")?;

            let file_path = &self.get_file_path();

            match crate::util::delete_file(file_path) {
                // Ignore "file not found" errors. This can happen when the
                // upstream caller has already cleaned up the file as part of
                // its own error handling.
                Err(e) if e.kind() == ErrorKind::NotFound => {
                    debug!("File '{}' already deleted.", file_path);
                    Ok(())
                }
                Err(e) => Err(e.into()),
                _ => Ok(()),
            }
        }}
    }

    pub fn delete_all_by_cipher(cipher_uuid: &str, conn: &DbConn) -> EmptyResult {
        for attachment in Attachment::find_by_cipher(cipher_uuid, conn) {
            attachment.delete(conn)?;
        }
        Ok(())
    }

    pub fn find_by_id(id: &str, conn: &DbConn) -> Option<Self> {
        db_run! { conn: {
            attachments::table
                .filter(attachments::id.eq(id.to_lowercase()))
                .first::<AttachmentDb>(conn)
                .ok()
                .from_db()
        }}
    }

    pub fn find_by_cipher(cipher_uuid: &str, conn: &DbConn) -> Vec<Self> {
        db_run! { conn: {
            attachments::table
                .filter(attachments::cipher_uuid.eq(cipher_uuid))
                .load::<AttachmentDb>(conn)
                .expect("Error loading attachments")
                .from_db()
        }}
    }

    pub fn size_by_user(user_uuid: &str, conn: &DbConn) -> i64 {
        db_run! { conn: {
            let result: Option<i64> = attachments::table
                .left_join(ciphers::table.on(ciphers::uuid.eq(attachments::cipher_uuid)))
                .filter(ciphers::user_uuid.eq(user_uuid))
                .select(diesel::dsl::sum(attachments::file_size))
                .first(conn)
                .expect("Error loading user attachment total size");
            result.unwrap_or(0)
        }}
    }

    pub fn count_by_user(user_uuid: &str, conn: &DbConn) -> i64 {
        db_run! { conn: {
            attachments::table
                .left_join(ciphers::table.on(ciphers::uuid.eq(attachments::cipher_uuid)))
                .filter(ciphers::user_uuid.eq(user_uuid))
                .count()
                .first(conn)
                .unwrap_or(0)
        }}
    }

    pub fn size_by_org(org_uuid: &str, conn: &DbConn) -> i64 {
        db_run! { conn: {
            let result: Option<i64> = attachments::table
                .left_join(ciphers::table.on(ciphers::uuid.eq(attachments::cipher_uuid)))
                .filter(ciphers::organization_uuid.eq(org_uuid))
                .select(diesel::dsl::sum(attachments::file_size))
                .first(conn)
                .expect("Error loading user attachment total size");
            result.unwrap_or(0)
        }}
    }

    pub fn count_by_org(org_uuid: &str, conn: &DbConn) -> i64 {
        db_run! { conn: {
            attachments::table
                .left_join(ciphers::table.on(ciphers::uuid.eq(attachments::cipher_uuid)))
                .filter(ciphers::organization_uuid.eq(org_uuid))
                .count()
                .first(conn)
                .unwrap_or(0)
        }}
    }
}