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

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

    app.get('/',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var url;
            if ( 'drafts' in req.query ) {
                url = '_design/surveys/_view/drafts';
            } else if ( 'published' in req.query ) {
                url = '_design/surveys/_view/published';
            } else {
                url = '_design/default/_view/by_type?key='+JSON.stringify('Survey');
            }
            couch.get(url)
            .handle({
                '-1': _.identity,
                200: function(result) {
                    return _.map(result.rows, function(item) {
                        return item.value;
                    });
                },
                default: util.handleUnknownResponse
            })
            .handle({'-1': util.handleException})
            .handle(res.send.bind(res));
        });
    app.post('/',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var doc = req.body;
            var hr;
            if ( !util.areDocsUnique(doc.questions) ) {
                hr = new HTTPResult(400,{error:"Survey contains duplicate questions."});
            } else if ( util.isDocPublished(doc) &&
                        !util.areDocsPublished(doc.questions) ) {
                hr = new HTTPResult(400,{error:"Cannot publish Survey with unpublished questions."});
            } else {
                hr = util.postDocument('Survey',doc);
            }
            hr.handle({'-1': util.handleException})
              .handle(res.send.bind(res));
        });
    app.get('/:id',
        util.ensureMIME(util.JSON_MIME),
        util.makeDocGet_id('Survey'));
    app.put('/:id',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var id = req.params.id;
            var doc = req.body;
            var rev = etags.parse(req.header('If-Match'))[0] || (doc && doc._rev);
            if ( !util.areDocsUnique(doc.questions) ) {
                new HTTPResult(400,{error:"Survey contains duplicate questions."})
                .handle(res.send.bind(res));
            } else if ( util.isDocPublished(doc) &&
                        !util.areDocsPublished(doc.questions) ) {
                new HTTPResult(400,{error:"Cannot publish Survey with unpublished questions."})
                .handle(res.send.bind(res));
            } else {
                util.putDocument(id,rev,'Survey',doc)
                .handle({
                    '-1': function(result) {
                        util.handleException(result)
                        .handle(res.send.bind(res));
                    },
                    201: function(doc) {
                        res.set({
                            'ETag': etags.format([doc._rev])
                        }).send(201, doc);
                    },
                    default: res.send.bind(res)
                });
            }
        });
    app.delete('/:id',
        util.ensureMIME(util.JSON_MIME),
        util.makeDocDel_id('Survey'));
    return exports;
};