use Link;
use searchers::Searcher;

use reqwest;
use reqwest::Client;

use serde_json;
use serde_json::Value;

use std;
use std::io::Read;

use std::any::Any;

#[derive(Debug)]
pub struct MtgCard {
    name: String,
    cost: String,
    typeline: String,
    rules: String,
    flavor: Option<String>,
    power: Option<String>,
    toughness: Option<String>,
    url: String,
    image_url: String
}

impl Link for MtgCard {
    fn label (&self) -> &str {
        &self.name
    }

    fn url (&self) -> &str {
        &self.url
    }

    fn as_any (&self) -> &Any {
        self
    }
}

pub struct MtgSearcher {
    client: Client
}

impl MtgSearcher {
    pub fn new () -> MtgSearcher {
        MtgSearcher {
            client: Client::new().unwrap()
        }
    }

    fn do_search (&self, name: &str) -> Result<String, Error> {
        let mut contents = String::new();
        let api_url = &format!("https://api.magicthegathering.io/v1/cards?name={}", name);
        self.client.get(api_url).send()?.read_to_string(&mut contents)?;
        Result::Ok(contents)
    }
}

fn parse_entry (page: String) -> Result<MtgCard, Error> {
    let parsed: Value = serde_json::from_str(&page)?;
    let ref parsed_entry = parsed["cards"][0];
    if let Some(_) = parsed_entry.as_object() {
        Result::Ok(MtgCard {
            name: parsed_entry["name"].as_str().map(String::from).expect("expected name in json data"),
            cost: parsed_entry["manaCost"].as_str().map(String::from).expect("expected cost in json data"),
            typeline: parsed_entry["type"].as_str().map(String::from).expect("expected type in json data"),
            rules: parsed_entry["text"].as_str().map(String::from).expect("expected text in json data"),
            flavor: parsed_entry["flavor"].as_str().map(String::from),
            power: parsed_entry["power"].as_str().map(String::from),
            toughness: parsed_entry["toughness"].as_str().map(String::from),
            url: parsed_entry["imageUrl"].as_str().map(String::from).expect("expected image url in json data"),
            image_url: parsed_entry["imageUrl"].as_str().map(String::from).expect("expected image url in json data")
        })
    } else {
        Result::Err(Error::Other(String::from("No card info found")))
    }
}

impl Searcher<MtgCard> for MtgSearcher {
    fn exact_search (&self, name: &str) -> Option<MtgCard> {
        let search = format!(r#""{}""#, name);
        self.do_search(&search).and_then(parse_entry).ok()
    }
}

#[derive(Debug)]
enum Error {
    Http(reqwest::Error),
    Io(std::io::Error),
    Json(serde_json::Error),
    Other(String)
}

impl From<reqwest::Error> for Error {
    fn from (error: reqwest::Error) -> Error {
        Error::Http(error)
    }
}

impl From<std::io::Error> for Error {
    fn from (error: std::io::Error) -> Error {
        Error::Io(error)
    }
}

impl From<serde_json::Error> for Error {
    fn from (error: serde_json::Error) -> Error {
        Error::Json(error)
    }
}