var q = require('q');
var http = require('q-io/http');
var fs = require('q-io/fs');
var _ = require('underscore');

var dbURL = "http://localhost:5984/";
var designDocs = require('./couchdb-design-docs');

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 request(method,path,content) {
    var url = dbURL+path;
    return http.request({
        url: url,
        method: method,
        headers: {
            'content-type': 'application/json; charset=utf-8',
            'accept': 'application/json'
        },
        body: {
            forEach: function(callback) {
                callback(JSON.stringify(content || {}));
            }
        }
    }).then(function(res){
        return res.body.read().then(function(content){
            return JSON.parse(content);
        });
    },function(res){
        return res.body.read().then(function(error){
            return JSON.parse(error);
        });
    });
}

console.log("Configuring CouchDB for QED");
console.log("Checking CouchDB version");
request('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");
    }
    console.log("Checking database 'qed'");
}).then(function(res){
    return request('GET','qed')
    .then(function(res){
        if (res.error) {
            console.log("Creating database 'qed'");
            return request('PUT','qed');
        } else {
            console.log("Database 'qed' found.");
            return null;
        }
    },function(err){
        console.log("Creating database 'qed'");
        return request('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;
        delete doc.__configAction;
        switch (configAction) {
            case "ignore":
                console.log(docUrl+" ignored.");
            case "update":
                console.log(docUrl+" updating.");
                return request('GET',docUrl)
                .then(function(oldDoc){
                    _.extend(oldDoc,doc);
                    return request('PUT',docUrl,oldDoc);
                },function(){
                    return request('PUT',docUrl,doc);
                });
            case "replace":
            default:
                console.log(docUrl+" replacing.");
                return request('GET',docUrl)
                .then(function(oldDoc){
                    _.extend(oldDoc,_.pick(oldDoc,'_rev'));
                    return request('PUT',docUrl,doc);
                },function(){
                    return request('PUT',docUrl,doc);
                });
        }
    }));
}).then(function(){
    console.log("Done!");
},function(err){
    console.error("ERROR",err);
});