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// Copyright 2020 ZomboDB, LLC <zombodb@gmail.com>. All rights reserved. Use of this source code is
// governed by the MIT license that can be found in the LICENSE file.

//! A helper struct for creating a Postgres `List` of `String`s to qualify an object name

use crate::list::PgList;
use crate::pg_sys;

/// A helper struct for creating a Postgres `List` of `String`s to qualify an object name
pub struct PgQualifiedNameBuilder {
    list: PgList<pg_sys::Value>,
}

impl Default for PgQualifiedNameBuilder {
    fn default() -> Self {
        Self::new()
    }
}

impl PgQualifiedNameBuilder {
    pub fn new() -> PgQualifiedNameBuilder {
        PgQualifiedNameBuilder {
            list: PgList::<pg_sys::Value>::new(),
        }
    }

    pub fn push(mut self, value: &str) -> PgQualifiedNameBuilder {
        unsafe {
            // SAFETY:  the result of pg_sys::makeString is always a valid pointer
            self.list.push(pg_sys::makeString(
                std::ffi::CString::new(value).unwrap().into_raw(),
            ));
        }
        self
    }

    pub fn get_operator_oid(self, lhs_type: pg_sys::Oid, rhs_type: pg_sys::Oid) -> pg_sys::Oid {
        unsafe { pg_sys::OpernameGetOprid(self.list.into_pg(), lhs_type, rhs_type) }
    }
}