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use std::rc::Rc;

use super::backend::Pg;
use super::connection::raw::RawConnection;
use query_builder::{QueryBuilder, Binds, BuildQueryResult};
use types::HasSqlType;

pub struct PgQueryBuilder {
    conn: Rc<RawConnection>,
    pub sql: String,
    pub binds: Binds,
    pub bind_types: Vec<u32>,
    bind_idx: u32,
}

impl PgQueryBuilder {
    pub fn new(conn: &Rc<RawConnection>) -> Self {
        PgQueryBuilder {
            conn: conn.clone(),
            sql: String::new(),
            binds: Vec::new(),
            bind_types: Vec::new(),
            bind_idx: 0,
        }
    }
}

impl QueryBuilder<Pg> for PgQueryBuilder {
    fn push_sql(&mut self, sql: &str) {
        self.sql.push_str(sql);
    }

    fn push_identifier(&mut self, identifier: &str) -> BuildQueryResult {
        let escaped_identifier = try!(self.conn.escape_identifier(identifier));
        Ok(self.push_sql(&escaped_identifier))
    }

    fn push_bound_value<T>(&mut self, bind: Option<Vec<u8>>) where
        Pg: HasSqlType<T>,
    {
        self.bind_idx += 1;
        let sql = format!("${}", self.bind_idx);
        self.push_sql(&sql);
        self.binds.push(bind);
        self.bind_types.push(Pg::metadata().oid);
    }
}