mod api;
mod cmd;
mod config;

use api::API;
use chrono::{NaiveDateTime, ParseError};
use cmd::*;
use config::Config;
use std::fs::File;
use std::io::prelude::*;

fn main() {
    let env: EnvOpt = argh::from_env();

    match env.subcommand {
        Subcommand::Run(opt) => {
            let mut file = match File::open("config.toml") {
                Ok(file) => file,
                Err(e) => {
                    eprintln!("Could not read config file: {}\nMake sure one exists with init subcommand.", e);
                    return;
                }
            };
            let mut string = String::new();
            if let Err(e) = file.read_to_string(&mut string) {
                eprintln!("Config file data not valid UTF-8: {}", e);
                return;
            }

            let config: Config = match toml::from_str(&string) {
                Ok(config) => config,
                Err(e) => {
                    eprintln!("Config file could not be parsed: {}", e);
                    return;
                }
            };

            run(&config, None, None).ok();
        }
        Subcommand::Init(opt) => {
            let config = Config::default();

            let mut file = File::create("config.toml").unwrap();
            if let Err(e) = file.write_all(&toml::to_vec(&config).unwrap()) {
                eprintln!("Could not write to file: {}", e);
            }
        }
    }
}

fn run(config: &Config, from: Option<String>, to: Option<String>) -> Result<(), ParseError> {
    let mut api = API::new(config.clone());

    let from = get_opt(from.map(|f| NaiveDateTime::parse_from_str(&f, &config.between_format)))?;
    let to = get_opt(to.map(|t| NaiveDateTime::parse_from_str(&t, &config.between_format)))?;

    let tags = api.get_tags().unwrap();
    let first_tag = tags[0].id.clone().unwrap();
    let state_list = api.get_states(&first_tag).unwrap();

    let states = API::get_between(state_list.clone(), from, to, true, &config);
    let len = states.len();

    let mut locations = Vec::new();
    for (idx, (_, state)) in states.iter().enumerate() {
        println!("Expected {}s left", exp_time(&api, (len - idx) as u32));
        let mut location_list = api
            .get_locations(&first_tag, state.id.as_ref().unwrap())
            .unwrap();
        locations.append(&mut location_list);
    }

    dbg!(API::get_between(locations, from, to, false, &config));
    Ok(())
}

fn get_opt<A, B>(option: Option<Result<A, B>>) -> Result<Option<A>, B> {
    if let Some(res) = option {
        match res {
            Ok(a) => Ok(Some(a)),
            Err(b) => Err(b),
        }
    } else {
        Ok(None)
    }
}

fn exp_time(api: &API, reqs_left: u32) -> f32 {
    (reqs_left * api.last_response_ping) as f32 / 1000.
}