define([
     'dojo/_base/json',
     'dojo/_base/lang',
     'dojo/Deferred',
     'dojo/request',
     'dojox/lang/functional',
     './docs'
],function(json,lang,Deferred,request,func,docs){
    var dbUrl = "http://localhost:5984/";

    function serializeFunctions(value) {
        if ( value === null ) {
            return null;
        } else if ( lang.isArray(value) ) {
            return value;
        } else if ( lang.isFunction(value) ) {
            return value.toString();
        } else if ( lang.isObject(value) ) {
            return func.mapIn(value,serializeFunctions);
        } else {
            return value;
        }
    }

    function req(method,path,body) {
        var args = {
            contentType: 'application/json',
            handleAs: 'json',
            data: json.toJson(body || {})
        };
        return request[method](dbUrl+path,args);
    }

    function asyncSeq(functions) {
        var d = new Deferred();
        (function stepper(fs,arg) {
            if ( fs.length > 0 ) {
                try {
                    var f = fs.shift();
                    var ret = f(arg);
                    if ( ret && ret.then ) {
                        ret.then(function(ret){
                            stepper(fs,ret);
                        });
                    } else {
                        stepper(fs,ret);
                    }
                } catch(err) {
                    d.reject(err);
                }
            } else {
                d.resolve();
            }
        })(functions);
        return d.promise;
    }

    function asyncFor(list,callback,ctx) {
        var d = new Deferred();
        (function stepper(list,idx){
            if ( list.length > 0 ) {
                var el = list.shift();
                var ret = callback.call(ctx,el,idx);
                if ( ret && ret.then ) {
                    ret.then(function(){
                        stepper(list,idx+1);
                    });
                } else {
                    stepper(list,idx+1);
                }
            } else {
                d.resolve();
            }
        })(list,0);
        return d.promise;
    }

    asyncSeq([
        function(){
            console.log("Configuring CouchDB for RFT:");
        },
        function(){
            console.log("Checking CouchDB version");
            return req('get','')
            .then(function(res){
                if (res.version !== "1.2.0" ) {
                    console.log("Found "+res.version+", only tested with CouchDB 1.2.0")
                } else {
                    console.log("CouchDB 1.2.0 found");
                }
            });
        },function(){
            console.log("Checking database 'qed'");
            return req('get','qed')
            .then(function(res){
                if (res.error) {
                    console.log("Creating database 'qed'");
                    return req('put','/qed');
                } else {
                    console.log("Database 'qed' found.");
                }
            },function(res){
                console.log("Creating database 'qed'");
                return req('put','/qed');
            });
        },function(){
            return serializeFunctions(docs);
        },function(docs){
            console.log("Putting documents in database.");
            return asyncFor(func.keys(docs),function(docUrl){
                var doc = docs[docUrl];
                var configAction = doc.__configAction;
                delete doc.__configAction;
                switch (configAction) {
                    case "ignore":
                        console.log(docUrl+" ignored.");
                    case "update":
                        console.log(docUrl+" updating.");
                        return req('get',docUrl)
                        .then(function(oldDoc){
                            lang.mixin(oldDoc,doc);
                            return req('put',docUrl,oldDoc);
                        },function(){
                            return req('put',docUrl,doc);
                        });
                    case "replace":
                    default:
                        console.log(docUrl+" replacing.");
                        return req('get',docUrl)
                        .then(function(oldDoc){
                            doc['_rev'] = oldDoc['_rev'];
                            return req('put',docUrl,doc);
                        },function(){
                            return req('put',docUrl,doc);
                        });
                }
            });
        },function(){
            console.log("Done!");
        }
    ]);


});