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#![allow(dead_code)]

extern crate postgres;
extern crate r2d2;
extern crate r2d2_postgres;
extern crate rustc_serialize;
#[macro_use] extern crate lazy_static;
#[macro_use] extern crate log;

use std::sync::RwLock;
use postgres::rows::Row;
use postgres::types::{ToSql,FromSql};
use r2d2::{Config, Pool, PooledConnection};
use r2d2_postgres::{PostgresConnectionManager, SslMode};

pub trait Entity {
    fn convert(row: Row) -> Self;
}


impl<T: FromSql> Entity for T {
    fn convert(row: Row) -> Self {
        row.get(0)
    }
}

#[macro_export]
macro_rules! reposable {
    (struct $name:ident($table_name:ident) {
        $($field_name:ident: $field_type:ty,)*
    }) => {
        #[derive(Default,Debug,RustcEncodable, RustcDecodable,Clone, PartialEq,Eq)]
        struct $name {
            $($field_name: $field_type,)*
        }

        impl Entity for $name{
            fn convert(row: ::postgres::rows::Row)->Self{
               let mut m=$name::default();
               //println!("table_name:{}",stringify!($table_name));
               $(m.$field_name=row.get(stringify!($field_name));)*
               m
            }
        }

    }
}

pub struct PostgresConfig {
    pub host: String,
    pub port: String,
    pub user_name: String,
    pub password: String,
    pub db_name: String,
}

lazy_static! {
    static ref POSTGRES_POOL: RwLock<Option<Pool<PostgresConnectionManager>>>  = RwLock::new(None);
}

pub fn init(c: &PostgresConfig) {
    let connect_str = format!("postgres://{}:{}@{}:{}/{}", c.user_name, c.password, c.host, c.port, c.db_name);
    info!("Connecting to postgres:{}", connect_str);
    let manager = PostgresConnectionManager::new(connect_str.as_str(), SslMode::None).unwrap();
    let config = Config::builder().pool_size(10).build();
    match Pool::new(config, manager) {
        Ok(pool) => {
            info!("Connected to postgres with pool: {:?}", pool);
            let mut w = POSTGRES_POOL.write().unwrap();
            *w = Some(pool);
        }
        Err(err) => {
            panic!("error occurs when connect to postgres {}.Error info:{}", connect_str, err);
        }
    };
}

fn get_conn() -> PooledConnection<PostgresConnectionManager> {
    match *POSTGRES_POOL.read().unwrap() {
        Some(ref pool) => {
            match pool.get() {
                Ok(conn) => conn,
                Err(err) => panic!("error in get_conn():{}", err),
            }
        },
        None => panic!("repository not initialized"),
    }
}


pub fn find_one<T: Entity>(query: &str, params: &[&ToSql]) -> Option<T> {
    info!("find_one: {}, params:{:?}", query, params);
    let conn = get_conn();
    match conn.query(query, params) {
        Ok(rows) => {
            return rows.into_iter().next().map(T::convert);
        }
        Err(err) => {
            panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err)
        }
    }
    None
}

pub fn find_list<T: Entity>(query: &str, params: &[&ToSql]) -> Vec<T> {
    info!("find_list: {}, params:{:?}", query, params);
    let conn = get_conn();
    match conn.query(query, params) {
        Ok(rows) => {
            return rows.into_iter().map(T::convert).collect();
        }
        Err(err) => {
            panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err)
        }
    }
    vec![]
}

// return: the number of rows modified
pub fn execute(query: &str, params: &[&ToSql]) -> u64 {
    info!("execute :{}, params:{:?}", query, params);
    let conn = get_conn();
    // conn.execute(query,params).unwrap()
    match conn.execute(query, params) {
        Ok(count) => count,
        Err(err) => panic!("error occur when execute query:{},params:{:?},error:{}", query, params, err),
    }
}

pub fn batch_execute(query: &str) -> postgres::Result<()> {
    info!("batch_execute :{}", query);
    let conn = get_conn();
    conn.batch_execute(query)
}