module.exports = function (RED) {

    "use strict";

    var sdk = require("matrix-js-sdk");
    var md = require("markdown-it")();
    const fs = require('fs');

    // --------------------------------------------------------------------------------------------
    // The configuration node holds the configuration and credentials for all nodes.

    function MatrixBotNode(config) {
        RED.nodes.createNode(this, config);

        // copy "this" object in case we need it in context of callbacks of other functions.
        var node = this;

        node.log("Initializing Matrix Bot node");

        // Configuration options passed by Node Red
        node.userId = config.userId;
        node.room = config.room;

        // TODO: Switch from configuration to credentials and check with if (this.credentials)
        node.accessToken = config.accessToken;
        node.matrixServerURL = config.matrixServerURL;

        node.matrixClient = sdk.createClient({
            baseUrl: node.matrixServerURL,
            accessToken: node.accessToken,
            userId: node.userId
        });

        // If no room is specified, join any room where we are invited
        if (!node.room || node.room === "") {
            node.matrixClient.on("RoomMember.membership", function (event, member) {
                if (member.membership === "invite" && member.userId === node.userId) {
                    node.log("Trying to join room " + member.roomId);
                    node.matrixClient.joinRoom(member.roomId).then(function () {
                        node.log("Automatically accepted invitation to join room " + member.roomId);
                    }).catch(function (e) {
                        node.warn("Cannot join room (probably because I was kicked) " + member.roomId + ": " + e);
                    });
                }
            });
        }

        node.matrixClient.on("sync", function (state, prevState, data) {
            switch (state) {
                case "ERROR":
                    // update UI to say "Connection Lost"
                    node.warn("Connection to Matrix server lost");
                    node.updateConnectionState(false);
                    break;
                case "SYNCING":
                    // update UI to remove any "Connection Lost" message
                    node.updateConnectionState(true);
                    break;
                case "PREPARED":
                    // the client instance is ready to be queried.
                    node.log("Synchronized to Matrix server.");

                    if (node.room) {
                        node.log("Trying to join room " + node.room);

                        node.matrixClient.joinRoom(node.room, { syncRoom: false })
                            .then(function (joinedRoom) {
                                node.log("Joined " + node.room);
                                node.room = joinedRoom.roomId;
                                node.updateConnectionState(true);
                            }).catch(function (e) {
                                node.warn("Error joining " + node.room + ": " + e);
                            });
                    } else {
                        node.log("No room configured. Will only join rooms where I'm invited");
                    }
                    break;
            }
        });

        node.log("Connecting to Matrix server...");

        node.matrixClient.startClient();

        // Called when the connection state may have changed
        this.updateConnectionState = function (connected) {
            if (node.connected !== connected) {
                node.connected = connected;
                if (connected) {
                    node.emit("connected");
                } else {
                    node.emit("disconnected");
                }
            }
        };

        // When Node-RED updates nodes, disconnect from server to ensure a clean start
        node.on("close", function (done) {
            node.log("Matrix configuration node closing...");
            if (node.matrixClient) {
                node.log("Disconnecting from Matrix server...");
                node.matrixClient.stopClient();
                node.updateConnectionState(false);
            }
            done();
        });

    }

    RED.nodes.registerType("matrix bot", MatrixBotNode);

    // --------------------------------------------------------------------------------------------
    // The output node sends a message to the chat.

    function MatrixOutNode(config) {
        RED.nodes.createNode(this, config);

        // copy "this" object in case we need it in context of callbacks of other functions.
        var node = this;

        // Configuration options passed by Node Red
        node.configNode = RED.nodes.getNode(config.bot);

        node.configNode.on("connected", function () {
            node.status({ fill: "green", shape: "ring", text: "connected" });
        });

        node.configNode.on("disconnected", function () {
            node.status({ fill: "red", shape: "ring", text: "disconnected" });
        });

        this.on("input", function (msg) {
            if (!node.configNode || !node.configNode.matrixClient) {
                node.warn("No configuration");
                return;
            }

            if (msg.payload) {
                node.log("Sending message " + msg.payload);

                var destRoom = "";
                if (msg.roomId) {
                    destRoom = msg.roomId;
                } else if (node.configNode.room) {
                    destRoom = node.configNode.room;
                } else {
                    node.warn("Room must be specified in msg.roomId or in configuration");
                    return;
                }

                node.configNode.matrixClient.sendHtmlMessage(destRoom, msg.payload.toString(), md.render(msg.payload.toString()))
                    .then(function () {
                        node.log("Message sent: " + msg.payload);
                    }).catch(function (e) {
                        node.warn("Error sending message " + e);
                    });
            } else {
                node.warn("msg.payload is empty");
            }
        });

        this.on("close", function (done) {
            node.log("Matrix out node closing...");
            done();
        });
    }

    RED.nodes.registerType("matrix sender", MatrixOutNode);

    // --------------------------------------------------------------------------------------------
    // Tim: File Send node

    function MatrixFileOutNode(config) {
        RED.nodes.createNode(this, config);

        const node = this;

        node.configNode = RED.nodes.getNode(config.bot);

        node.configNode.on('connected', () => {
            node.status({ fill: 'green', shape: 'ring', text: 'connected' });
        });

        node.configNode.on('disconnected', () => {
            node.status({ fill: 'red', shape: 'ring', text: 'disconnected' });
        });

        this.on('input', msg => {
            if (!node.configNode || !node.configNode.matrixClient) {
                node.warn('No configuration');
                return;
            }

            if (msg.payload) {
                node.log('Sending message ' + msg.payload);

                let destRoom = '';

                if (msg.roomId) {
                    destRoom = msg.roomId;
                }
                else if (node.configNode.room) {
                    destRoom = node.configNode.room;
                }
                else {
                    node.warn('Room must be specified in msg.roomId or in config');
                    return;
                }

                const filePath = msg.payload;
                fs.readFile(filePath, (err, data) => {
                    if (err) {
                        node.warn('Error reading file', err);
                        return;
                    }
                    
                    const tks = filePath.split('/');
                    const fname = tks[tks.length - 1];

                    const opts = {
                        rawResponse: false,
                        name: fname
                    }

                    node.configNode.matrixClient.uploadContent(data, opts).then(res => {
                        node.log('success uploading file', res);
                        console.log('Uploaded file', res);
                        
                        const imageUri = res.content_uri;
                        console.log('imageUri', imageUri);

                        node.configNode.matrixClient.sendImageMessage(destRoom, imageUri, {}, 'image.png', () => {
                            console.log('image send func');
                        }).then(() => {
                            node.log('image sent success');
                            console.log('image sent success')
                        }).catch(e => {
                            node.warn('error sending img: ', e);
                            console.log('error sending image', e)
                        })
                    }).catch(err => {
                        node.warn('Error uploading file', err);
                    })
                });                
            }
            else {
                node.warn('msg.payload empty')
            }
        });

        this.on('close', done => {
            node.log('matrix file out node closing...');
            done();
        });
    }

    RED.nodes.registerType("matrix file sender", MatrixFileOutNode);


    // --------------------------------------------------------------------------------------------
    // The input node receives messages from the chat.

    function MatrixInNode(config) {
        RED.nodes.createNode(this, config);

        // copy "this" object in case we need it in context of callbacks of other functions.
        var node = this;
        node.configNode = RED.nodes.getNode(config.bot);

        node.log("MatrixInNode initializing...");

        if (!node.configNode) {
            node.warn("No configuration node");
            return;
        }

        node.status({ fill: "red", shape: "ring", text: "disconnected" });

        node.configNode.on("disconnected", function () {
            node.status({ fill: "red", shape: "ring", text: "disconnected" });
        });

        node.configNode.on("connected", function () {
            node.status({ fill: "green", shape: "ring", text: "connected" });
            node.configNode.matrixClient.on("Room.timeline", function (event, room, toStartOfTimeline, data) {
                if (toStartOfTimeline) {
                    return; // don't print paginated results
                }
                if (event.getType() !== "m.room.message") {
                    return; // only keep messages
                }
                if (!event.getSender() || event.getSender() === node.configNode.userId) {
                    return; // ignore our own messages
                }
                if (!event.getUnsigned() || event.getUnsigned().age > 1000) {
                    return; // ignore old messages
                }
                // TODO process messages other than text
                node.log(
                    // the room name will update with m.room.name events automatically
                    "Received chat message: (" + room.name + ") " + event.getSender() + " :: " + event.getContent().body
                );
                var msg = {
                    payload: event.getContent().body,
                    sender: event.getSender(),
                    roomId: room.roomId
                };
                node.send(msg);
            });
        });

        this.on("close", function (done) {
            node.log("Matrix in node closing...");
            done();
        });

    }

    RED.nodes.registerType("matrix receiver", MatrixInNode);

    // --------------------------------------------------------------------------------------------
    // The command node receives messages from the chat.

    function MatrixCommandNode(config) {
        RED.nodes.createNode(this, config);

        // copy "this" object in case we need it in context of callbacks of other functions.
        var node = this;
        node.command = config.command;
        node.configNode = RED.nodes.getNode(config.bot);

        node.log("MatrixCommandNode initializing...");

        if (!node.configNode) {
            node.warn("No configuration node");
            return;
        }

        node.status({ fill: "red", shape: "ring", text: "disconnected" });

        node.configNode.on("disconnected", function () {
            node.status({ fill: "red", shape: "ring", text: "disconnected" });
        });

        node.configNode.on("connected", function () {
            node.status({ fill: "green", shape: "ring", text: "connected" });
            node.configNode.matrixClient.on("Room.timeline", function (event, room, toStartOfTimeline, data) {
                if (toStartOfTimeline) {
                    return; // don't print paginated results
                }
                if (event.getType() !== "m.room.message") {
                    return; // only keep messages
                }
                if (!event.getSender() || event.getSender() === node.configNode.userId) {
                    return; // ignore our own messages
                }
                if (!event.getUnsigned() || event.getUnsigned().age > 1000) {
                    return; // ignore old messages
                }
                // TODO process messages other than text
                node.log(
                    // the room name will update with m.room.name events automatically
                    "Received chat message: (" + room.name + ") " + event.getSender() + " :: " + event.getContent().body
                );

                var message = event.getContent().body;

                var tokens = message.split(" ");

                if (tokens[0] == node.command) {
                    node.log("Recognized command " + node.command + "  Processing...");
                    var remainingText = message.replace(node.command, "");
                    var msg = {
                        payload: remainingText,
                        sender: event.getSender(),
                        roomId: room.roomId,
                        originalMessage: message
                    };
                    node.send([msg, null]);
                }

            });
        });

        this.on("close", function (done) {
            node.log("Matrix command node closing...");
            done();
        });
    }

    RED.nodes.registerType("matrix command", MatrixCommandNode);

}