module.exports = function (RED) {
    "use strict";

    function ZammadTicketNode(config) {
        RED.nodes.createNode(this, config);
        const node = this;

        node.configNode = RED.nodes.getNode(config.config);
        if (!node.configNode) { node.error("No zammad-config node configured"); return; }

        node.operation = config.operation || "list";
        node.status({ fill: "blue", shape: "ring", text: "ready" });

        function doRequest(method, path, body, msg, done) {
            node.status({ fill: "yellow", shape: "dot", text: method + " " + path });
            node.configNode.sendRequest(method, path, body, {}, function (err, result) {
                if (err) { node.status({ fill: "red", shape: "ring", text: "error" }); done ? done(err) : node.error(err, msg); return; }
                msg.payload = result.body;
                msg.statusCode = result.statusCode;
                msg.zammad = result;
                node.status({ fill: "green", shape: "dot", text: result.statusCode });
                done();
            });
        }

        function buildTicketPayload(msg) {
            if (msg.payload && typeof msg.payload === "object" && msg.payload.title) return msg.payload;
            const p = {};
            if (msg.title !== undefined) p.title = msg.title;
            if (msg.customer !== undefined) p.customer = msg.customer;
            if (msg.group !== undefined) p.group = msg.group;
            if (msg.state !== undefined) p.state = msg.state;
            if (msg.priority !== undefined) p.priority = msg.priority;
            if (msg.body !== undefined || msg.articleBody !== undefined) {
                p.article = { body: msg.body || msg.articleBody, from: msg.from || "System", to: msg.to || "", sender: msg.sender || "Agent", type: msg.articleType || "note" };
            }
            return p;
        }

        node.on("input", function (msg, send, done) {
            const op = msg.operation || node.operation;
            switch (op) {
                case "list": {
                    const p = new URLSearchParams();
                    if (msg.query) p.append("query", msg.query);
                    if (msg.limit) p.append("per_page", msg.limit);
                    if (msg.page) p.append("page", msg.page);
                    const qs = p.toString();
                    doRequest("GET", "/tickets" + (qs ? "?" + qs : ""), undefined, msg, done);
                    break;
                }
                case "search": {
                    const p = new URLSearchParams();
                    if (msg.query) p.append("query", msg.query);
                    if (msg.limit) p.append("per_page", msg.limit);
                    const qs = p.toString();
                    doRequest("GET", "/tickets/search" + (qs ? "?" + qs : ""), undefined, msg, done);
                    break;
                }
                case "get": {
                    const id = msg.ticketId || msg.payload;
                    if (!id) { node.error("Missing ticketId"); done && done(new Error("Missing ticketId")); return; }
                    doRequest("GET", "/tickets/" + encodeURIComponent(id), undefined, msg, done);
                    break;
                }
                case "create": {
                    doRequest("POST", "/tickets", buildTicketPayload(msg), msg, done);
                    break;
                }
                case "update": {
                    const id = msg.ticketId || (msg.payload && msg.payload.id);
                    if (!id) { node.error("Missing ticketId"); done && done(new Error("Missing ticketId")); return; }
                    doRequest("PUT", "/tickets/" + encodeURIComponent(id),
                        msg.payload && typeof msg.payload === "object" && msg.payload.title ? msg.payload : buildTicketPayload(msg), msg, done);
                    break;
                }
                case "articles": {
                    const id = msg.ticketId || (msg.payload && msg.payload.id);
                    if (!id) { node.error("Missing ticketId"); done && done(new Error("Missing ticketId")); return; }
                    doRequest("GET", "/ticket_articles/by_ticket/" + encodeURIComponent(id), undefined, msg, done);
                    break;
                }
                case "addArticle": {
                    const id = msg.ticketId || (msg.payload && msg.payload.id);
                    if (!id) { node.error("Missing ticketId"); done && done(new Error("Missing ticketId")); return; }
                    const sender = msg.sender || "Agent";
                    doRequest("POST", "/ticket_articles", {
                        body: msg.articleBody || msg.body || (msg.payload && msg.payload.body) || "",
                        from: msg.from || sender, sender, type: msg.articleType || "note",
                        internal: msg.internal !== undefined ? msg.internal : false, contentType: "text/plain"
                    }, msg, done);
                    break;
                }
                case "tags": {
                    const id = msg.ticketId || (msg.payload && msg.payload.id);
                    if (!id) { node.error("Missing ticketId"); done && done(new Error("Missing ticketId")); return; }
                    doRequest("GET", "/tickets/" + encodeURIComponent(id) + "/tags", undefined, msg, done);
                    break;
                }
                case "addTag": {
                    const id = msg.ticketId || (msg.payload && msg.payload.id);
                    const tag = msg.tag || msg.tagName;
                    if (!id || !tag) { node.error("Missing ticketId or tag"); done && done(new Error("Missing ticketId or tag")); return; }
                    doRequest("POST", "/tags/add", { tag, object: "Ticket", o_id: id }, msg, done);
                    break;
                }
                default: {
                    const err = new Error("Unknown operation: " + op);
                    node.error(err);
                    if (done) done(err);
                }
            }
        });
    }

    RED.nodes.registerType("zammad-ticket", ZammadTicketNode);
};