#![allow(dead_code)]

use crate::av::init;
use crate::transcoder_manager::{TranscoderInstance, TranscoderManager};
use async_std::fs::File;
use async_std::sync::{Arc, RwLock};
use ffmpeg_sys_next::{av_make_error_string, av_malloc, av_version_info};
use http_types::Error as HttpError;
use lazy_static::lazy_static;
use std::collections::HashMap;
use std::ffi::{CStr, CString};
use std::option::Option::Some;
use std::os::raw::{c_char, c_int};
use std::str::FromStr;
use tide::{Request, StatusCode};
use uuid::Uuid;

pub mod av;
pub mod transcoder;
pub mod transcoder_manager;
pub mod utils;

// const INPUT_PATH: &str = "/tank/ephemeral/anime/series/Witch Hunter Robin - 2ndfire/[2ndfire]Witch_Hunter_Robin_-_01[91DCE49A].mkv";
const INPUT_PATH: &str = "/tank/ephemeral/anime/series/Brave Witches - Eila/Extras/[Eila] Brave Witches - NCOP [BD 1080p][DB44ED0B].mkv";
const OUTPUT_PATH: &str = "/tmp/transotf";

fn av_err2str(error_code: c_int) -> String {
    unsafe {
        let str: *mut c_char = av_malloc(1024).cast();
        av_make_error_string(str, 1024, error_code);
        CString::from_raw(str).to_str().unwrap().to_string()
    }
}

lazy_static! {
    static ref HOME_PAGE: String = {
        format!(
            "{}: {}\nffmpeg: {}",
            env!("CARGO_PKG_NAME"),
            env!("CARGO_PKG_VERSION"),
            unsafe { CStr::from_ptr(av_version_info()).to_str().unwrap_or("n/a") },
        )
    };
}

#[derive(Default)]
struct State {
    manager: RwLock<TranscoderManager>,
}

async fn create_transcode(req: Request<State>) -> Result<String, HttpError> {
    let params = req.query::<HashMap<String, String>>()?;
    let target = params.get(&"target".to_string());
    let target = if let Some(target) = target {
        target
    } else {
        return Err(HttpError::from_str(
            StatusCode::BadRequest,
            "no target given",
        ));
    };

    {
        File::open(target).await.map_err(|err| {
            HttpError::from_str(
                StatusCode::BadRequest,
                format!("Failed to open file: {}", err),
            )
        })?;
    }

    let id = req
        .state()
        .manager
        .write()
        .await
        .start(target.clone(), None, None)
        .map_err(|err| {
            HttpError::from_str(
                StatusCode::InternalServerError,
                format!("Failed to start transcoder: {}", err),
            )
        })?;

    Ok(format!("{}", id))
}

async fn get_init(req: Request<State>) -> Result<String, HttpError> {
    let _manager = req.state().manager.read().await;
    // manager.get()

    Err(HttpError::from_str(StatusCode::NotFound, ":3"))
}

async fn get_instance(req: &Request<State>) -> Result<Arc<TranscoderInstance>, HttpError> {
    let id = req.param::<String>("id")?;
    let id = Uuid::from_str(&id)?;
    let manager = req.state().manager.read().await;
    if let Some(instance) = manager.get(id) {
        Ok(instance)
    } else {
        Err(HttpError::from_str(
            StatusCode::NotFound,
            format!("Can't find transcoder with id {}", id),
        ))
    }
}

async fn get_manifest(req: Request<State>) -> Result<String, HttpError> {
    let transcoder_instance = get_instance(&req).await?;
    let (duration, segments, init_written) = transcoder_instance
        .state(|item| {
            (
                item.duration(),
                item.segments().clone(),
                item.init_written(),
            )
                .clone()
        })
        .await;

    Ok(format!("{} {:?} {}", duration, segments, init_written))
}

// async fn get_status(req: Request<State>) -> Result<String, HttpError> {
//     let id = req.param::<String>("id")?;
//     let id = Uuid::from_str(&id)?;
//     let manager = req.state().manager.read().await;
// }

#[async_std::main]
async fn main() -> std::io::Result<()> {
    println!("{}", HOME_PAGE.clone());

    init();

    let mut app = tide::with_state(State::default());
    app.at("/").get(|_| async { Ok(HOME_PAGE.clone()) });
    app.at("/transcode").get(create_transcode);
    // app.at("/session/:id").get(get_status);
    app.at("/session/:id/manifest").get(get_manifest);
    // app.at("/session/:id/{type}/init.mp4");
    // app.at("/session/:id/{type}/{nr}.m4s");
    app.listen("0:8000").await
}