use super::Config;
use super::GenericError;
use chrono::format::ParseError;
use chrono::NaiveDateTime;
use minreq::Response;
use serde::Deserialize;
use std::sync::mpsc;
use std::sync::mpsc::Receiver;
use std::thread;
use std::thread::sleep;
use std::thread::Thread;
use std::time::{Duration, Instant};

pub trait Timestamped {
    fn timestamp(&self) -> Option<String>;
}

#[derive(Deserialize, Debug)]
pub struct ErrorModel {
    #[serde(rename(deserialize = "Message"))]
    pub message: Option<String>,
}

#[derive(Deserialize, Debug)]
pub struct TagModel {
    pub id: Option<String>,
    pub imei: Option<String>,
    #[serde(rename(deserialize = "batteryValue"))]
    pub battery_value: Option<i32>,
    #[serde(rename(deserialize = "btId"))]
    pub bt_id: Option<String>,
    #[serde(rename(deserialize = "nfcId"))]
    pub nfc_id: Option<String>,
}

#[derive(Deserialize, Debug, Clone)]
pub struct StateModel {
    pub id: Option<String>,
    pub timestamp: Option<String>,
    #[serde(skip_deserializing)]
    pub state: Option<String>,
    #[serde(rename(deserialize = "realState"))]
    pub real_state: Option<String>,
}

impl Timestamped for StateModel {
    fn timestamp(&self) -> Option<String> {
        self.timestamp.clone()
    }
}

#[derive(Deserialize, Debug, Clone)]
#[serde(deny_unknown_fields)]
pub struct LocationModel {
    pub timestamp: Option<String>,
    #[serde(rename(deserialize = "type"))]
    pub loc_type: Option<String>,
    #[serde(rename(deserialize = "coordinateLat"))]
    pub lat: Option<f32>,
    #[serde(rename(deserialize = "coordinateLng"))]
    pub lon: Option<f32>,
    pub accuracy: Option<f32>,
}

impl Timestamped for LocationModel {
    fn timestamp(&self) -> Option<String> {
        self.timestamp.clone()
    }
}

pub struct API {
    config: Config,
    pub last_response_ping: u32,

    location_req_que: Vec<String>,
}

impl API {
    pub fn new(config: Config) -> API {
        API {
            last_response_ping: config.throttle,
            config: config,

            location_req_que: Vec::new(),
        }
    }

    pub fn get_tags(&mut self) -> Result<Vec<TagModel>, GenericError> {
        let response = self.request(self.config.tags_url.clone())?;
        let tags = response.json();
        if let Err(_) = tags {
            let err: ErrorModel = response.json()?;
            Err(GenericError::from(err))
        } else {
            tags.map_err(GenericError::from)
        }
    }

    pub fn get_states(&mut self, tag_id: &String) -> Result<Vec<StateModel>, GenericError> {
        let response = self.request(str::replace(&self.config.states_url, "{tag}", &tag_id))?;
        Ok(response.json()?)
    }

    pub fn queue_location(&mut self, tag_id: &String, state_id: &String) {
        let url = str::replace(&self.config.locations_url, "{tag}", &tag_id);
        let url = str::replace(&url, "{state}", &state_id);
        self.location_req_que.push(url);
        //let response = self.request(url)?;
        //Ok(response.json()?)
    }

    pub fn begin_location_fetch(&mut self) -> Receiver<Result<String, GenericError>> {
        let (sender, receiver) = mpsc::channel();
        let locations = self.location_req_que.clone();
        let config = self.config.clone();
        thread::spawn(move || {
            for location in locations {
                let sender = sender.clone();
                let config = config.clone();
                thread::spawn(move || {
                    println!("Send req!");
                    let response = minreq::get(location)
                        .with_header("content-type", "application/json")
                        .with_header("x-api-key", &config.api_key)
                        .send()
                        .map_err(GenericError::from)
                        .and_then(|r| {
                            String::from_utf8(r.into_bytes()).map_err(GenericError::from)
                        });
                    sender.send(response).ok();
                });
                thread::sleep_ms(100);
            }
        });
        self.location_req_que.clear();
        receiver
    }

    pub fn get_between<T: Timestamped>(
        list: Vec<T>,
        from: Option<NaiveDateTime>,
        to: Option<NaiveDateTime>,
        inclusive_from: bool,
        config: &Config,
    ) -> Vec<(NaiveDateTime, T)> {
        let mut timestamped = Vec::new();
        for item in list {
            if let Some(res) = API::parse_timestamp(&item.timestamp(), config) {
                match res {
                    Ok(t) => {
                        if let Some(to) = to {
                            if t > to {
                                continue;
                            }
                        }
                        let mut too_old = false;
                        if let Some(from) = from {
                            if t < from {
                                too_old = true;
                            }
                        }
                        if too_old {
                            if inclusive_from {
                                timestamped.push((t.clone(), item));
                            }
                            break;
                        }
                        timestamped.push((t.clone(), item));
                    }
                    Err(e) => panic!(e),
                }
            } else {
                println!("Skipped item, did not have timestmap");
            }
        }
        timestamped
    }

    fn request(&mut self, url: String) -> Result<Response, GenericError> {
        let before = Instant::now();
        let response = minreq::get(url)
            .with_header("content-type", "application/json")
            .with_header("x-api-key", &self.config.api_key)
            .send();
        let after = Instant::now();
        let min_time = Duration::new(0, self.config.throttle * 1_000_000);
        let duration = after.duration_since(before);
        self.last_response_ping = (duration.as_millis() as u32).max(self.config.throttle);
        if min_time > duration {
            sleep(min_time - duration);
        }
        response.map_err(GenericError::from)
    }

    fn parse_timestamp(
        timestamp: &Option<String>,
        config: &Config,
    ) -> Option<Result<NaiveDateTime, ParseError>> {
        if let Some(timestamp) = &timestamp {
            Some(NaiveDateTime::parse_from_str(
                &timestamp,
                &config.timestamp_format,
            ))
        } else {
            None
        }
    }
}