import { Service } from '../../../di/src/decorator/Service.ts'
import { Connection } from '../db/Connection.ts'
import PostgresConnection from '../db/PostgresConnection.ts'

export class DuplicateConnectionNameError extends Error {
    constructor(connection_name: string) {
        super(`A database connection with the name "${connection_name}" already exists.`)
    }
}

export class NoSuchDatabaseConnectionError extends Error {
    constructor(connection_name: string) {
        super(`No database connection exists with the name: "${connection_name}"`)
    }
}

@Service()
export default class Database {
    private connections: { [name: string]: Connection } = {}

    async postgres(name: string, config: { [key: string]: any }): Promise<PostgresConnection> {
        if ( this.connections[name] )
            throw new DuplicateConnectionNameError(name)

        const conn = new PostgresConnection(name, config)
        this.connections[name] = conn
        await conn.init()
        return conn
    }

    connection(name: string): Connection {
        if ( !this.connections[name] )
            throw new NoSuchDatabaseConnectionError(name)

        return this.connections[name]
    }
}