package main

import (
	"irc"
	"fmt"
	"strings"
	"http"
	"io/ioutil"
	"json"
	"container/vector"
	"html"
)

var commands = map [string]func(*irc.Conn, string, string, string) {
	"tr": translate,
}

const googleAPIKey = "ABQIAAAA6-N_jl4ETgtMf2M52JJ_WRQjQjNunkAJHIhTdFoxe8Di7fkkYhRRcys7ZxNbH3MIy_MKKcEO4-9_Ag"

func handlePrivmsg(conn *irc.Conn, line *irc.Line) {
	target := line.Args[0]
	if target[0] == '#' || target[0] == '&' {
		// message to a channel
		command(conn, line.Nick, line.Text, target)
	} else if target == conn.Me.Nick {
		// message to us
		command(conn, line.Nick, line.Text, line.Nick)
	}
}

func handleMode(conn *irc.Conn, line *irc.Line) {
	if line.Args[0] == conn.Me.Nick && line.Text == "+r" {
		autojoin(conn)
	}
}

func command(conn *irc.Conn, nick, text, target string) {
	if !strings.HasPrefix(text, trigger) {
		return
	}
	split := strings.Split(text, " ", 2)
	if len(split[0]) < 2 {
		return
	}
	handler := commands[split[0][1:]]
	if handler != nil {
		if len(split) > 1 {
			handler(conn, nick, split[1], target)
		} else {
			handler(conn, nick, "", target)
		}
	}
}

func say(conn *irc.Conn, target, message string, a ...interface{}) {
	conn.Privmsg(target, fmt.Sprintf(message, a...))
}

func translate(conn *irc.Conn, nick, args, target string) {
	var langPairs vector.StringVector
	for {
		split := strings.Split(args, " ", 2)
		if len(split) == 2 && len(split[0]) == 5 && split[0][2] == '|' {
			langPairs.Push("&langpair=" + split[0])
			args = split[1]
		} else {
			break
		}
	}

	var url string
	if langPairs.Len() > 0 {
		// translate
		langPairsSlice := []string(langPairs)
		url = fmt.Sprintf("http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=%s%s&key=%s",
		                   http.URLEscape(args), strings.Join(langPairsSlice, ""), googleAPIKey)
	} else {
		// language detect
		url = fmt.Sprintf("http://ajax.googleapis.com/ajax/services/language/detect?v=1.0&q=%s&key=%s",
		                   http.URLEscape(args), googleAPIKey)
	}

	response, _, err := http.Get(url)
	defer response.Body.Close()
	if err != nil {
		say(conn, target, "%s: Error while requesting translation", nick); return
	}
	b, err := ioutil.ReadAll(response.Body)
	if err != nil {
		say(conn, target, "%s: Error while downloading translation", nick); return
	}

	var result map[string]interface{}
	err = json.Unmarshal(b, &result)
	if err != nil {
		say(conn, target, "%s: Error while decoding translation", nick); return
	}
	if result["responseStatus"] != float64(200) {
		say(conn, target, "%s: %s", nick, result["responseDetails"]); return
	}

	if langPairs.Len() > 0 {
		// translate
		sayTr(conn, target, result["responseData"])
	} else {
		// language detect
		var data map[string]interface{} = result["responseData"].(map[string]interface{})
		say(conn, target, "Language: %s, confidence: %f, is reliable: %t", data["language"], data["confidence"], data["isReliable"])
	}
}

func sayTr(conn *irc.Conn, target string, data interface{}) {
	switch t := data.(type) {
	case []interface{}:
		var dataList []interface{} = data.([]interface{})
		for _, d := range dataList {
			var innerData map[string]interface{} = d.(map[string]interface{})
			sayTr(conn, target, innerData["responseData"])
		}
	case map[string]interface{}:
		trText := data.(map[string]interface{})["translatedText"].(string)
		say(conn, target, html.UnescapeString(trText))
	}
}