var q = require('q'),
    request = require('../util/q-request'),
    _ = require('underscore'),
    util = require('util');

var designDocs = require('./couchdb-design-docs');

module.exports = function(couchDbURL) {

    function stringifyFunctions(value) {
        if ( value === null ) {
            return null;
        } else if ( _.isArray(value) ) {
            return value;
        } else if ( _.isFunction(value) ) {
            return value.toString();
        } else if ( _.isObject(value) ) {
            value = _.clone(value);
            _.each(value, function(propValue, propName){
                value[propName] = stringifyFunctions(propValue);
            });
            return value;
        } else {
            return value;
        }
    }

    function dbRequest(method,path,content) {
        var url = couchDbURL+path;
        var options = {
            method: method,
            headers: {
                'content-type': 'application/json; charset=utf-8',
                'accept': 'application/json'
            },
            body: JSON.stringify(content)
        };
        //console.log('req',url,options);
        return request(url,options).then(function(res){
            return JSON.parse(res);
        }, function(err){
            return JSON.parse(err);
        });
    }

    console.log("Configuring CouchDB for QED");
    console.log("Checking CouchDB version");
    return dbRequest('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");
        }
    }).then(function(res){
        console.log("Checking database 'qed'");
        return dbRequest('GET','qed')
        .then(function(res){
            console.log("Database 'qed' found.");
        },function(err){
            console.log("Creating database 'qed'");
            return dbRequest('PUT','qed');
        });
    }).then(function(){
        console.log("Putting documents in database.");
        designDocs = stringifyFunctions(designDocs);
        return q.all(_.map(designDocs, function(doc,docUrl){
            var configAction = doc.__configAction || "replace";
            delete doc.__configAction;
            switch (configAction) {
            case "ignore":
                console.log(docUrl+" ignored.");
                break;
            case "update":
                console.log(docUrl+" updating.");
                return dbRequest('GET',docUrl)
                .then(function(oldDoc){
                    _.extend(oldDoc,doc);
                    return dbRequest('PUT',docUrl,oldDoc);
                },function(){
                    return dbRequest('PUT',docUrl,doc);
                });
            case "replace":
                console.log(docUrl+" replacing.");
                return dbRequest('GET',docUrl)
                .then(function(oldDoc){
                    _.extend(doc,_.pick(oldDoc,'_id','_rev'));
                    return dbRequest('PUT',docUrl,doc);
                },function(){
                    return dbRequest('PUT',docUrl,doc);
                });
            default:
                console.warn("Unknown action",configAction);
                break;
            }
        }));
    }).then(function(results){
        console.log("Done!");
    },function(err){
        console.error("ERROR",err,err.stack);
    });

};