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//! Instances of libhoney

use std::cell::RefCell;
use std::sync::Arc;
use std::collections::HashMap;

use transmission::Transmission;
use builder_trait::BuilderT;
use builder::Builder;
use event::Event;
use serde_json::value::Value;

pub struct Libhoney {
    builder: RefCell<Builder>,
}

impl Libhoney {
    pub fn new() -> Libhoney {
        Config::default().build()
    }

    fn configured(config: Config) -> Libhoney {
        Libhoney {
            builder: RefCell::new(Builder::new_root(Arc::new(config.transmission))),
        }
    }

    pub fn configure() -> Config {
        Config::default()
    }
}

pub struct Config {
    transmission: Transmission,
    api_host: String,
    write_key: String,
    dataset: String,
}

impl Default for Config {
    fn default() -> Config {
        Config {
            transmission: Transmission::new(),
            api_host: "https://api.honeycomb.io".to_string(),
            write_key: "".to_string(),
            dataset: "".to_string(),
        }
    }
}

impl Config {
    pub fn transmission(self, val: Transmission) -> Config {
        Config {
            transmission: val,
            api_host: self.api_host,
            write_key: self.write_key,
            dataset: self.dataset,
        }
    }

    pub fn api_host<S>(self, val: S) -> Config where S : Into<String> {
        Config {
            transmission: self.transmission,
            api_host: val.into(),
            write_key: self.write_key,
            dataset: self.dataset,
        }
    }

    pub fn write_key<S>(self, val: S) -> Config where S : Into<String> {
        Config {
            transmission: self.transmission,
            api_host: self.api_host,
            write_key: val.into(),
            dataset: self.dataset,
        }
    }

    pub fn dataset<S>(self, val: S) -> Config where S : Into<String> {
        Config {
            transmission: self.transmission,
            api_host: self.api_host,
            write_key: self.write_key,
            dataset: val.into(),
        }
    }

    pub fn build(self) -> Libhoney {
        Libhoney::configured(self)
    }
}
// an implementation of the BuilderT trait that proxies to Libhoney's builder.
impl BuilderT for Libhoney {
    #[inline]
    fn add_field<S>(&mut self, key: S, value: Value) -> &mut Libhoney where S : Into<String> {
        self.builder.borrow_mut().add_field(key, value);
        self
    }
        
    #[inline]
    fn add_dynamic_field<S>(&mut self, key: S, value: fn() -> Value) -> &mut Libhoney where S : Into<String>  {
        self.builder.borrow_mut().add_dynamic_field(key, value);
        self
    }

    #[inline]
    fn add(&mut self, data: HashMap<String, Value>) -> &mut Libhoney {
        self.builder.borrow_mut().add(data);
        self
    }

    #[inline]
    fn new_event(&self/* ... */) -> Event {
        self.builder.borrow_mut().new_event()
    }

    #[inline]
    fn new_builder(&self/* ... */) -> Builder {
        self.builder.borrow_mut().new_builder()
    }

    #[inline]
    fn get_fields(&self) -> HashMap<String, Value> {
        self.builder.borrow_mut().get_fields()
    }

    #[inline]
    fn get_dynamic_fields(&self) -> HashMap<String, fn() -> Value> {
        self.builder.borrow_mut().get_dynamic_fields()
    }
}