var express = require("express")
  , cryptoken = require("../util/crypto-token")
  , 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();

    var isSurveyRunRunning = exports.isSurveyRunRunning = function(surveyRun) {
        var now = new Date();
        var afterStart = !surveyRun.startDate || now >= new Date(surveyRun.startDate);
        var beforeEnd = !surveyRun.endDate || now <= new Date(surveyRun.endDate);
        return afterStart && beforeEnd;
    };

    app.get('/responses/:id',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var id = req.params.id;
            var rev = etags.parse(req.header('If-Non-Match'))[0];
            var secret = req.query.secret;
            util.getDocument(id,rev,'Response')
            .handle({
                200: function(response) {
                    if ( response.secret === secret ) {
                        return util.getDocument(response.surveyRunId,[],'SurveyRun')
                        .handle({
                            200: function(surveyRun) {
                                if ( !isSurveyRunRunning(surveyRun) ) {
                                    return new HTTPResult(404,{error:"Survey is not running anymore."});
                                } else {
                                    response._surveyRun = surveyRun;
                                    return response;
                                }
                            }
                        });
                    } else {
                        return new HTTPResult(403,{error: "Wrong secret for response"});
                    }
                }
            })
            .handle(res.send.bind(res));
        });
    app.post('/responses',
        util.ensureMIME(util.JSON_MIME),
        function(req,res) {
            var secret = req.query.secret;
            var response = req.body;
            delete response._surveyRun;
            util.getDocument(response.surveyRunId,[],'SurveyRun')
            .handle({
                200: function(surveyRun) {
                    if ( surveyRun.secret !== secret ) {
                        return new HTTPResult(403,{error:"Wrong secret for surveyRun."});
                    } else if ( !isSurveyRunRunning(surveyRun) ) {
                        return new HTTPResult(404,{error:"Survey is not running anymore."});
                    } else if ( surveyRun.mode === 'closed' ) {
                        return new HTTPResult(403,{error:"Survey is closed and doesn't allow new responses."});
                    } else {
                        return cryptoken()
                        .then(function(token) {
                            response.secret = token;
                            return util.postDocument('Response',response)
                            .then(function(doc){
                                doc._surveyRun = surveyRun;
                                return doc;
                            });
                        });
                    }
                }
            })
            .handle(res.send.bind(res));
        });
    app.put('/responses/: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);
            var secret = req.query.secret || doc.secret;
            delete doc._surveyRun;
            util.getDocument(id,[],'Response')
            .handle({
                200: function(prev) {
                    if ( prev.secret !== secret ) {
                        return new HTTPResult(403,{error: "Secrets are not the same."});
                    } else if ( prev.surveyRunId !== doc.surveyRunId ) {
                        return new HTTPResult(400,{error:"Response cannot change it's surveyRunId."});
                    } else {
                        doc.secret = secret; // restore in case it got lost or was changed
                        return util.getDocument(doc.surveyRunId,[],'SurveyRun')
                        .handle({
                            200: function(surveyRun) {
                                if ( !isSurveyRunRunning(surveyRun) ) {
                                    return new HTTPResult(404,{error:"Survey is not running anymore."});
                                } else {
                                    return util.putDocument(id,rev,'Response',doc)
                                    .handle({
                                        200: function(doc) {
                                            doc._surveyRun = surveyRun;
                                            return new HTTPResult(201,doc);
                                        }
                                    });
                                }
                            }
                        });
                    }
                }
            })
            .handle(res.send.bind(res));
        });
    app.delete('/responses/: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);
            var secret = req.query.secret || doc.secret;
            delete doc._surveyRun;
            util.getDocument(id,[],'Response')
            .handle({
                200: function(prev) {
                    if ( prev.secret !== secret ) {
                        return new HTTPResult(403,{error: "Secrets are not the same."});
                    } else {
                        return util.getDocument(doc.surveyRunId,[],'SurveyRun')
                        .handle({
                            200: function(surveyRun) {
                                if ( surveyRun.respondentCanDeleteOwnResponse === true ) {
                                    return util.deleteDocument(id,rev,doc);
                                } else {
                                    return new HTTPResult(403,{error:"Not allowed to delete response."});
                                }
                            }
                        });
                    }
                }
            })
            .handle(res.send.bind(res));
        });

    return exports;
};