// Copyright 2013 Simon Sapin.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use idna::punycode::{decode, encode_str};
use rustc_serialize::json::{Json, Object};
use test::TestFn;

fn one_test(decoded: &str, encoded: &str) {
    match decode(encoded) {
        None => panic!("Decoding {} failed.", encoded),
        Some(result) => {
            let result = result.into_iter().collect::<String>();
            assert!(result == decoded,
                    format!("Incorrect decoding of \"{}\":\n   \"{}\"\n!= \"{}\"\n",
                            encoded, result, decoded))
        }
    }

    match encode_str(decoded) {
        None => panic!("Encoding {} failed.", decoded),
        Some(result) => {
            assert!(result == encoded,
                    format!("Incorrect encoding of \"{}\":\n   \"{}\"\n!= \"{}\"\n",
                            decoded, result, encoded))
        }
    }
}

fn get_string<'a>(map: &'a Object, key: &str) -> &'a str {
    match map.get(&key.to_string()) {
        Some(&Json::String(ref s)) => s,
        None => "",
        _ => panic!(),
    }
}

pub fn collect_tests<F: FnMut(String, TestFn)>(add_test: &mut F) {
    match Json::from_str(include_str!("punycode_tests.json")) {
        Ok(Json::Array(tests)) => for (i, test) in tests.into_iter().enumerate() {
            match test {
                Json::Object(o) => {
                    let test_name = {
                        let desc = get_string(&o, "description");
                            if desc.is_empty() {
                            format!("Punycode {}", i + 1)
                        } else {
                            format!("Punycode {}: {}", i + 1, desc)
                        }
                    };
                    add_test(test_name, TestFn::dyn_test_fn(move || one_test(
                        get_string(&o, "decoded"),
                        get_string(&o, "encoded"),
                    )))
                }
                _ => panic!(),
            }
        },
        other => panic!("{:?}", other)
    }
}