module.exports = function(RED) {
    var https = require('https');
    var http = require('http');
    var url = require('url');

    var OPERATIONS = {
        'webhook:list':       { method:'GET',    path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks', query:['uri'] },
        'webhook:get':        { method:'GET',    path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks/{id}' },
        'webhook:create':     { method:'POST',   path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks',
            body:['httpMethod','uri','event','eventFilter','userIdFilter','headers','authMethod','authData','tokenNeeded'] },
        'webhook:update':     { method:'POST',   path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks/{id}',
            body:['httpMethod','uri','event','eventFilter','userIdFilter','headers','authMethod','authData','tokenNeeded'] },
        'webhook:delete':     { method:'DELETE', path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks/{id}' },
        'webhook:deleteByApp':{ method:'DELETE', path:'/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks/byappid/{appid}' }
    };

    function WebhooksNode(config) {
        RED.nodes.createNode(this, config);
        var node = this;
        this.configNode = RED.nodes.getNode(config.nextcloud);
        this.operation = config.operation || 'webhook:list';
        this.webhookId = config.webhookId; this.appId = config.appId;
        this.bodyHttpMethod = config.bodyHttpMethod; this.bodyUri = config.bodyUri;
        this.bodyEvent = config.bodyEvent; this.bodyEventFilter = config.bodyEventFilter;
        this.bodyUserIdFilter = config.bodyUserIdFilter; this.bodyHeaders = config.bodyHeaders;
        this.bodyAuthMethod = config.bodyAuthMethod; this.bodyAuthData = config.bodyAuthData;
        this.bodyTokenNeeded = config.bodyTokenNeeded;

        if (!this.configNode) { node.error("No Nextcloud configuration node selected"); return; }

        node.on('input', function(msg) {
            var op = OPERATIONS[msg.operation || node.operation];
            if (!op) { node.error("Unknown operation: " + (msg.operation || node.operation), msg); return; }

            var baseUrl = (node.configNode.baseUrl || '').replace(/\/+$/, '');
            var username = node.configNode.credentials.username;
            var password = node.configNode.credentials.password;

            var path = op.path
                .replace('{id}', msg.webhookId || node.webhookId || '')
                .replace('{appid}', msg.appId || node.appId || '');

            var queryParts = [];
            if (op.query) {
                op.query.forEach(function(q) {
                    var v = msg[q] !== undefined ? msg[q] : getField(node, q);
                    if (v !== undefined && v !== '') queryParts.push(encodeURIComponent(q) + '=' + encodeURIComponent(v));
                });
            }
            var fullUrl = baseUrl + path + (queryParts.length ? '?' + queryParts.join('&') : '');
            var parsedUrl = url.parse(fullUrl);

            var headers = { 'OCS-APIRequest':'true','Accept':'application/json',
                'Authorization':'Basic '+Buffer.from(username+':'+password).toString('base64') };

            var bodyObj = {};
            if (op.body) {
                op.body.forEach(function(b) {
                    var v = msg[b] !== undefined ? msg[b] : getField(node, b);
                    if (v !== undefined && v !== '') bodyObj[b] = v;
                });
            }
            if (msg.eventFilter) bodyObj.eventFilter = msg.eventFilter;
            if (msg.headers && typeof msg.headers === 'object') bodyObj.headers = msg.headers;
            if (msg.authData) bodyObj.authData = msg.authData;
            if (msg.tokenNeeded) bodyObj.tokenNeeded = msg.tokenNeeded;

            var bodyStr = null;
            if (Object.keys(bodyObj).length > 0) { headers['Content-Type']='application/json'; bodyStr=JSON.stringify(bodyObj); }

            var opts = { hostname:parsedUrl.hostname, port:parsedUrl.port||(parsedUrl.protocol==='https:'?443:80),
                path:parsedUrl.path, method:op.method, headers:headers, rejectUnauthorized:false };

            node.log(op.method+' '+fullUrl);
            var transport = parsedUrl.protocol==='https:'?https:http;
            var req = transport.request(opts, function(res) {
                var body=''; res.on('data',function(c){body+=c;});
                res.on('end',function(){ msg.statusCode=res.statusCode; msg.operation=msg.operation||node.operation;
                    try{msg.payload=JSON.parse(body);}catch(e){msg.payload=body;} node.send(msg); });
            });
            req.on('error',function(err){msg.error=err.message;node.error(op.method+' '+fullUrl+' — '+err.message,msg);});
            if(bodyStr) req.write(bodyStr);
            req.end();
        });
    }
    function getField(node,name) {
        var m={ 'httpMethod':node.bodyHttpMethod,'uri':node.bodyUri,'event':node.bodyEvent,'uri':node.bodyUri };
        return m[name];
    }
    RED.nodes.registerType("webhooks", WebhooksNode);
};