var express = require("express")
  , HTTPResult = require("../util/http-result")
  , _ = require("underscore")
  ;

module.exports = function(couch,schema) {
    var exports = {};
    
    var util = require('./util')(couch,schema);
    var app = exports.app = express();

    var getTopics = exports.getTopics = function(sub) {
        var url = '_design/questions/_view/'+(sub||'all')+'_topics';
        return couch.get(url,{query:{reduce:true,group:true}})
        .handle({
            '-1': _.identity,
            200: function(result) {
                return _.map(result.rows, function(item) { return {name:item.key, count:item.value}; });
            },
            default: util.handleUnknownResponse
        });
    };
    var getTopicsWithCategory = exports.getTopicsWithCategory = function(category,sub) {
        var url = '_design/questions/_view/'+(sub||'all');
        return couch.get(url,{query:{reduce:true,group:true,group_level:2,startkey:[category],endkey:[category,{}]}})
        .handle({
            '-1': _.identity,
            200: function(result) {
                return _.map(result.rows, function(item) { return { name:item.key[1], count:item.value }; });
            },
            default: util.handleUnknownResponse
        });
    };

    app.get('/',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var sub = 'published' in req.query && 'published';
            var hr;
            if ( 'category' in req.query ) {
                hr = getTopicsWithCategory(req.query.category,sub);
            } else {
                hr = getTopics(sub);
            }
            hr.handle({'-1': util.handleException})
              .handle(res.send.bind(res));
        });

    return exports;
};