package main

import (
	"encoding/json"
	"fmt"
	"go/doc"
	"log"
	"math"
	"net/http"
	"os"
	"sort"
	"strings"
)

const url = "http://api.urbandictionary.com/v0/define?term="
const usage = "ud: search for term on urban dictionary\n\nusage: ud <term>\n"

type response struct {
	Results []result `json:"list"`
}

type result struct {
	Definition string `json:"definition"`
	Example    string `json:"example"`
	Link       string `json:"permalink"`
	Author     string `json:"author"`

	Up   int `json:"thumbs_up"`
	Down int `json:"thumbs_down"`
}

type ByVotes []result

func (bv ByVotes) Len() int {
	return len(bv)
}

func (bv ByVotes) Swap(i, j int) {
	bv[i], bv[j] = bv[j], bv[i]
}
func (bv ByVotes) Less(i, j int) bool {
	return math.Abs(float64(bv[i].Up-bv[i].Down)) > math.Abs(float64(bv[j].Up-bv[j].Down))
}

func main() {
	if len(os.Args) < 2 {
		fmt.Fprintf(os.Stderr, "%s\n", usage)
		os.Exit(1)
	}

	words := os.Args[1:]
	u := fmt.Sprintf("%s%s", url, strings.Join(words, "+"))

	resp, err := http.Get(u)
	if err != nil {
		log.Fatal(err)
	}
	data := response{}
	err = json.NewDecoder(resp.Body).Decode(&data)
	resp.Body.Close()
	if err != nil {
		log.Fatal(err)
	}

	sort.Sort(ByVotes(data.Results))

	for i, res := range data.Results {
		fmt.Printf(
			"%d:\n",
			i,
		)
		doc.ToText(os.Stdout, res.Definition, "\t", "", 80)
		fmt.Printf(
			"\n\n\texample:\n\t%s\n",
			strings.Replace(res.Example, "\r\n", "\n\t", -1),
		)
		fmt.Printf(
			"\n\t%s\n\t^ %d, v %d\n\t%s\n",
			res.Link,
			res.Up,
			res.Down,
			res.Author,
		)
	}
}