pub mod api;
mod config;
mod errors;

use api::{LocationModel, SharetokenModel, StateModel, TagModel, API};
use chrono::NaiveDateTime;
use errors::LibError;
use std::io::prelude::*;
use std::path::PathBuf;
use std::sync::mpsc::TryRecvError;
use std::time::Duration;

pub use chrono;
pub use config::Config;
pub use errors::LibError as Error;
pub use errors::MessagedError;

pub fn init(path: &PathBuf, api_key: Option<String>) -> Result<(), LibError> {
    let mut config = Config::default();
    if let Some(api_key) = api_key {
        config.api_key = api_key;
    }
    Ok(config.write_to(path)?)
}

pub fn between(
    api: &mut API,
    tag_str: String,
    from: Option<NaiveDateTime>,
    to: Option<NaiveDateTime>,
) -> Result<(TagModel, Vec<(NaiveDateTime, LocationModel)>), LibError> {
    let tags = api.get_tags()?;
    let tag = find_tag(tag_str, &tags, &api.config)?;
    let tag_id = tag.get_id()?;

    print!("Preparing..\r");
    std::io::stdout().lock().flush().ok();

    let state_list = api.get_states(&tag_id)?;

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

    let mut locations = Vec::new();
    for (_, state) in states.iter() {
        api.queue_location(&tag_id, state.id.as_ref().unwrap());
    }
    let receiver = api.begin_location_fetch();
    let mut counter = 0;
    loop {
        match receiver.try_recv() {
            Ok(res) => match res {
                Ok(loc) => match loc {
                    Ok(mut loc) => {
                        counter += 1;
                        let remaining = exp_time(&api, states.len() as u64 - counter as u64);
                        print!(
                            "Done: {:<5.2}%    Remaining: {:<5.2} seconds\r",
                            counter as f32 / states.len() as f32 * 100.,
                            remaining.as_secs_f32()
                        );
                        std::io::stdout().lock().flush().ok();
                        locations.append(&mut loc);
                    }
                    Err(e) => eprintln!(
                        "Error fetching location data: {}",
                        e.message.unwrap_or(String::new())
                    ),
                },
                Err(e) => eprintln!("{}", e),
            },
            Err(e) => {
                if let TryRecvError::Disconnected = e {
                    break;
                }
            }
        }
    }
    println!("{:<100}", "\nDone!");
    locations.sort_by(|loc1, loc2| loc2.timestamp.cmp(&loc1.timestamp));

    let locs = API::get_between(&locations, from, to, false, &api.config);

    Ok((tag, locs))
}

pub fn check_api(api: &API) -> Result<(), LibError> {
    let tags = api.get_tags()?;
    if let Some(tag) = tags.get(0) {
        let tag_id = tag.get_id()?;

        api.get_current_locations(&tag_id)?;
        api.get_sharetoken(&tag_id)?;

        if let Some(state) = api.get_states(&tag_id)?.get(0) {
            let state_id = state.get_id()?;
            api.get_locations(&tag_id, &state_id)?;
            Ok(())
        } else {
            Err(LibError::MessagedError(
                "Could not find any states for the first device found.".to_owned(),
                None,
            ))
        }
    } else {
        Err(LibError::MessagedError("Could not find any devices. Please make sure this API-key is paired with a device first.".to_owned(), None))
    }
}

pub fn sharetoken(api: &API, tag: String) -> Result<SharetokenModel, LibError> {
    let tags = api.get_tags()?;
    let tag = find_tag(tag, &tags, &api.config)?;
    Ok(api.get_sharetoken(&tag.get_id()?)?)
}

pub fn nick_list(api: &API) -> Result<Vec<((usize, String), TagModel)>, LibError> {
    let mut tags = api.get_tags()?;
    tags.sort_by(|tag1, tag2| tag1.id.cmp(&tag2.id));
    let list = tags
        .iter()
        .enumerate()
        .map(|(idx, tag)| {
            (
                (
                    idx + 1,
                    tag.get_nick(&api.config)
                        .unwrap_or("No current nick".to_owned()),
                ),
                tag.clone(),
            )
        })
        .collect();
    Ok(list)
}

pub fn nick_set(api: &mut API, tag_str: String, nickname: String) -> Result<(), LibError> {
    let mut tags = api.get_tags()?;
    tags.sort_by(|tag1, tag2| tag1.id.cmp(&tag2.id));
    let tag = find_tag(tag_str.clone(), &tags, &api.config)?;
    if let Some(id) = &tag.id {
        api.config.nicknames.insert(id.clone(), nickname);
        Ok(())
    } else {
        Err(LibError::MessagedError(
            format!("Device {} does not have an id", tag_str),
            None,
        ))
    }
}

pub fn get_locations(
    api: &API,
    tag: String,
    state: Option<String>,
) -> Result<Vec<LocationModel>, LibError> {
    let tags = api.get_tags()?;
    let tag = find_tag(tag, &tags, &api.config)?;
    if let Some(state) = state {
        Ok(api.get_locations(&tag.get_id()?, &state)?)
    } else {
        Ok(api.get_current_locations(&tag.get_id()?)?)
    }
}

pub fn get_states(api: &API, tag: String) -> Result<Vec<StateModel>, LibError> {
    let tags = api.get_tags()?;
    let tag = find_tag(tag, &tags, &api.config)?;
    Ok(api.get_states(&tag.get_id()?)?)
}

fn exp_time(api: &API, reqs_left: u64) -> Duration {
    let interval = 1_000 / api.config.throttle as u64;
    Duration::from_millis(interval * reqs_left)
}

fn find_tag(tag_str: String, tags: &Vec<TagModel>, config: &Config) -> Result<TagModel, LibError> {
    let mut tag = None;
    if let Ok(num) = tag_str.parse::<i32>() {
        if let Some(found) = tags.get((num - 1).max(0) as usize) {
            tag = Some(found.clone());
        }
    }
    for curr in tags.iter() {
        if let Some(nick) = curr.get_nick(config) {
            if nick == tag_str {
                tag = Some(curr.clone());
            }
        }
    }
    match tag {
        Some(tag) => Ok(tag),
        None => Err(LibError::MessagedError(
            format!("Could not find device {}", tag_str),
            None,
        )),
    }
}