#[macro_use]
extern crate clap;

mod cfg_reader;
mod pulse_counter;
mod rest_api;

#[cfg(not(feature = "rppal"))]
mod input_pin_manager;
#[cfg(feature = "rppal")]
mod rpi_pin_manager;
// #[cfg(not(feature = "rppal"))]
use input_pin_manager::PinConfiguration;
#[cfg(feature = "rppal")]
use rpi_pin_manager::{input_pin_manager, RPiPinManager};

use async_std;
use async_std::task;
use std::sync::{Arc, Mutex};

const APP_VERSION: &'static str = env!("CARGO_PKG_VERSION");

const DEFAULT_CONFIG_FILE_NAME: &str = "/etc/s0_logger.cfg";
const DEFAULT_IP_ADDRESS: &str = "127.0.0.1";
const DEFAULT_IP_PORT: &str = "6310";

struct PulseDataProvider {
    pulse_counter: pulse_counter::PulseCounter,
}

impl rest_api::DataProvider for PulseDataProvider {
    fn get_channels(&self) -> Vec<usize> {
        self.pulse_counter.get_channels()
    }

    fn get_pulses_by_channel(
        &mut self,
        channel_id: usize,
    ) -> Result<Vec<rest_api::PulseInfo>, std::io::Error> {
        match self.pulse_counter.get_pulses_by_channel(channel_id) {
            Ok(pulses) => {
                let mut pulse_list: Vec<rest_api::PulseInfo> = vec![];
                for p in pulses {
                    pulse_list.push(rest_api::PulseInfo {
                        timestamp_ns: p.timestamp_ns,
                        channel_id: p.pin_id,
                        level: p.level,
                    })
                }
                Ok(pulse_list)
            }
            Err(e) => Err(e),
        }
    }
}

fn main() {
    let cli_args = clap_app!(s0_meter =>
        (version: APP_VERSION)
        (author: "Harald Kube <harald.kube@gmx.de")
        (about: "Listen for S0 pulses at the given GPIO pins")
        (@arg v: -v ... "Set the verbosity level (up to -vvv)")
        (@arg config: -c --config +takes_value "The name of the config file (default: /etc/s0_logger.cfg)")
    ).get_matches();

    let log_level = cli_args.occurrences_of("v");
    match log_level {
        0 => println!("No logging"),
        1 => println!("A little logging"),
        2 => println!("A little more logging"),
        _ => println!("A lot logging"),
    };

    let config_file_name = cli_args
        .value_of("config")
        .unwrap_or(DEFAULT_CONFIG_FILE_NAME);
    println!("Read the config from file '{}'", config_file_name);

    let mut pin_config: Vec<PinConfiguration> = vec![];
    match cfg_reader::parse_file(config_file_name) {
        Ok(config) => {
            println!("GPIO-Config:");
            for channel in config.channels() {
                println!("Channel {} @ GPIO {}", &channel.id, &channel.gpio);
                &mut pin_config.push(PinConfiguration {
                    channel_id: channel.id as usize,
                    gpio_id: channel.gpio as usize,
                });
            }
            println!("---");
        }
        Err(err_msg) => {
            // TODO Log
            panic!(
                "Error while parsing config file {}: {}",
                config_file_name, err_msg
            );
        }
    };

    #[allow(unused_assignments, unused_mut)]
    let mut pin_manager: Option<
        Arc<Mutex<Box<dyn input_pin_manager::InputPinManager + Send>>>,
    > = None;
    #[cfg(feature = "rppal")]
    {
        println!("Will access GPIO pins");
        let input_pin_manager_box: Box<dyn input_pin_manager::InputPinManager + Send> =
            Box::new(RPiPinManager::new());
        pin_manager = Some(Arc::new(Mutex::new(input_pin_manager_box)));
    }
    #[cfg(not(feature = "rppal"))]
    {
        println!("Will NOT access GPIO pins");
    }

    let rest_ip_addr = DEFAULT_IP_ADDRESS;
    let rest_ip_port = DEFAULT_IP_PORT;

    let mut p_counter = pulse_counter::PulseCounter::new(pin_manager.clone().unwrap(), pin_config);
    match p_counter.start() {
        Ok(()) => {}
        Err(e) => {
            // TODO Log
            println!("Could not start pulse_counter thread: {:?}", e);
        }
    }
    let dp: Arc<Mutex<Box<dyn crate::rest_api::DataProvider + Send>>> =
        Arc::new(Mutex::new(Box::new(PulseDataProvider {
            pulse_counter: p_counter,
        })));
    let rest_api_config = rest_api::RestApiConfig {
        ip_and_port: format!("{}:{}", &rest_ip_addr, &rest_ip_port),
        data_provider: dp.clone(),
    };

    let _ = task::block_on(rest_api::start(&rest_api_config));

    if pin_manager.is_some() {
        &pin_manager.unwrap().lock().unwrap().close_inputs();
    }
}