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extern crate chrono;
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate log;
extern crate redis;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
extern crate wild_thread_pool;

mod config;
mod redis_keys;
mod schedule;
mod worker;

pub use config::{Config, ScheduleConfig};
pub use schedule::{enqueue_at, start_schedule};

use std::collections::HashMap;
use std::borrow::Cow;
use std::time::Duration;
use std::ops::Deref;
use std::clone::Clone;
use wild_thread_pool::{ErrorExt, ThreadPool};

error_chain!{
    foreign_links {
        RedisError(::redis::RedisError);
        SerdeJsonError(::serde_json::Error);
    }

    errors {
        RegDupJobService(job_type: String){
            description("reg dup job service")
            display("reg dup job_service({})", job_type)
        }

        JobServiceNotFound(job_type: String){
            description("job service not found")
            display("job_service({}) not found", job_type)
        }
    }
}

pub trait WithRedis: Send + Clone + 'static {
    type Conn: Deref<Target = redis::Connection>;

    fn with_redis<F, R>(&self, f: F) -> Result<R>
    where
        F: FnOnce(&Self::Conn) -> Result<R>;
}

pub trait JobService: Send {
    fn run(&self, args: &[String]) -> Result<()>;

    fn queue(&self) -> &str;

    fn job_type(&self) -> &str;

    fn box_clone(&self) -> Box<JobService>;
}

// HashMap<JobType, Box<JobService>>
type JobServices = HashMap<String, Box<JobService>>;

impl Clone for Box<JobService> {
    fn clone(&self) -> Box<JobService> {
        self.box_clone()
    }
}

pub fn start<R>(c: Config<R>) -> Result<()>
where
    R: WithRedis,
{
    assert_ne!(c.fetch_timeout, 0);
    assert!(!c.job_services.is_empty());
    assert_ne!(c.tick_sleep, 0);
    assert_ne!(c.watch_dead_thread, 0);
    assert_ne!(c.workers, 0);

    let new_worker = worker::NewResqueWorker::new(
        c.host,
        c.with_redis,
        c.job_services,
        Duration::from_secs(c.tick_sleep),
        c.fetch_timeout,
    );

    let thread_pool = ThreadPool::new(
        c.workers,
        Duration::from_secs(c.stop_timeout),
        Duration::from_secs(c.watch_dead_thread),
        c.closed,
    );

    thread_pool.run(new_worker).wait()
}

pub fn enqueue<C>(redis_conn: &C, queue: &str, class: &str, args: &[String]) -> Result<()>
where
    C: Deref<Target = redis::Connection>,
{
    let item = JobItem {
        class: Cow::from(class),
        args: Cow::from(args),
    };

    let json = serde_json::to_string(&item)?;

    let _: (i64, i64) = redis::pipe()
        .cmd("SADD")
        .arg(redis_keys::queues())
        .arg(queue)
        .cmd("RPUSH")
        .arg(redis_keys::queue(queue))
        .arg(json)
        .query(redis_conn.deref())?;

    Ok(())
}

#[derive(Debug, Serialize, Deserialize, Clone)]
struct JobItem<'a> {
    class: Cow<'a, str>,
    args: Cow<'a, [String]>,
}

impl ErrorExt for Error {
    fn new_err(s: Cow<'static, str>) -> Self {
        match s {
            Cow::Borrowed(s) => s.into(),
            Cow::Owned(s) => s.into(),
        }
    }
}