pragma Singleton
pragma ComponentBehavior: Bound

import QtQuick
import Quickshell
import Quickshell.Io
import qs.Common

Singleton {
    id: root

    property bool dmsAvailable: false
    property var capabilities: []
    property int apiVersion: 0
    property string cliVersion: ""
    readonly property int expectedApiVersion: 1
    property var availablePlugins: []
    property var installedPlugins: []
    property bool isConnected: false
    property bool isConnecting: false
    property bool subscribeConnected: false
    readonly property bool forceExtWorkspace: false

    readonly property string socketPath: Quickshell.env("DMS_SOCKET")

    property var pendingRequests: ({})
    property int requestIdCounter: 0
    property bool shownOutdatedError: false
    property string updateCommand: "dms update"
    property bool checkingUpdateCommand: false

    signal pluginsListReceived(var plugins)
    signal installedPluginsReceived(var plugins)
    signal searchResultsReceived(var plugins)
    signal operationSuccess(string message)
    signal operationError(string error)
    signal connectionStateChanged

    signal networkStateUpdate(var data)
    signal cupsStateUpdate(var data)
    signal loginctlStateUpdate(var data)
    signal loginctlEvent(var event)
    signal capabilitiesReceived
    signal credentialsRequest(var data)
    signal bluetoothPairingRequest(var data)
    signal dwlStateUpdate(var data)
    signal brightnessStateUpdate(var data)
    signal brightnessDeviceUpdate(var device)
    signal extWorkspaceStateUpdate(var data)
    signal wlrOutputStateUpdate(var data)
    signal evdevStateUpdate(var data)

    property bool capsLockState: false

    property var activeSubscriptions: ["network", "network.credentials", "loginctl", "freedesktop", "gamma", "bluetooth", "bluetooth.pairing", "dwl", "brightness", "wlroutput", "evdev"]

    Component.onCompleted: {
        if (socketPath && socketPath.length > 0) {
            detectUpdateCommand();
        }
    }

    function detectUpdateCommand() {
        checkingUpdateCommand = true;
        checkAurHelper.running = true;
    }

    function startSocketConnection() {
        if (socketPath && socketPath.length > 0) {
            testProcess.running = true;
        }
    }

    Process {
        id: checkAurHelper
        command: ["sh", "-c", "command -v paru || command -v yay"]
        running: false

        stdout: StdioCollector {
            onStreamFinished: {
                const helper = text.trim();
                if (helper.includes("paru")) {
                    checkDmsPackage.helper = "paru";
                    checkDmsPackage.running = true;
                } else if (helper.includes("yay")) {
                    checkDmsPackage.helper = "yay";
                    checkDmsPackage.running = true;
                } else {
                    updateCommand = "dms update";
                    checkingUpdateCommand = false;
                    startSocketConnection();
                }
            }
        }

        onExited: exitCode => {
            if (exitCode !== 0) {
                updateCommand = "dms update";
                checkingUpdateCommand = false;
                startSocketConnection();
            }
        }
    }

    Process {
        id: checkDmsPackage
        property string helper: ""
        command: ["sh", "-c", "pacman -Qi dms-shell-git 2>/dev/null || pacman -Qi dms-shell-bin 2>/dev/null"]
        running: false

        stdout: StdioCollector {
            onStreamFinished: {
                if (text.includes("dms-shell-git")) {
                    updateCommand = checkDmsPackage.helper + " -S dms-shell-git";
                } else if (text.includes("dms-shell-bin")) {
                    updateCommand = checkDmsPackage.helper + " -S dms-shell-bin";
                } else {
                    updateCommand = "dms update";
                }
                checkingUpdateCommand = false;
                startSocketConnection();
            }
        }

        onExited: exitCode => {
            if (exitCode !== 0) {
                updateCommand = "dms update";
                checkingUpdateCommand = false;
                startSocketConnection();
            }
        }
    }

    Process {
        id: testProcess
        command: ["test", "-S", root.socketPath]

        onExited: exitCode => {
            if (exitCode === 0) {
                root.dmsAvailable = true;
                connectSocket();
            } else {
                root.dmsAvailable = false;
            }
        }
    }

    function connectSocket() {
        if (!dmsAvailable || isConnected || isConnecting) {
            return;
        }

        isConnecting = true;
        requestSocket.connected = true;
    }

    DankSocket {
        id: requestSocket
        path: root.socketPath
        connected: false

        onConnectionStateChanged: {
            if (connected) {
                root.isConnected = true;
                root.isConnecting = false;
                root.connectionStateChanged();
                subscribeSocket.connected = true;
            } else {
                root.isConnected = false;
                root.isConnecting = false;
                root.apiVersion = 0;
                root.capabilities = [];
                root.connectionStateChanged();
            }
        }

        parser: SplitParser {
            onRead: line => {
                if (!line || line.length === 0) {
                    return;
                }

                console.log("DMSService: Request socket <<", line);

                try {
                    const response = JSON.parse(line);
                    handleResponse(response);
                } catch (e) {
                    console.warn("DMSService: Failed to parse request response:", line, e);
                }
            }
        }
    }

    DankSocket {
        id: subscribeSocket
        path: root.socketPath
        connected: false

        onConnectionStateChanged: {
            root.subscribeConnected = connected;
            if (connected) {
                sendSubscribeRequest();
            }
        }

        parser: SplitParser {
            onRead: line => {
                if (!line || line.length === 0) {
                    return;
                }

                console.log("DMSService: Subscribe socket <<", line);

                try {
                    const response = JSON.parse(line);
                    handleSubscriptionEvent(response);
                } catch (e) {
                    console.warn("DMSService: Failed to parse subscription event:", line, e);
                }
            }
        }
    }

    function sendSubscribeRequest() {
        const request = {
            "method": "subscribe"
        };

        if (activeSubscriptions.length > 0) {
            request.params = {
                "services": activeSubscriptions
            };
            console.log("DMSService: Subscribing to services:", JSON.stringify(activeSubscriptions));
        } else {
            console.log("DMSService: Subscribing to all services");
        }

        subscribeSocket.send(request);
    }

    function subscribe(services) {
        if (!Array.isArray(services)) {
            services = [services];
        }

        activeSubscriptions = services;

        if (subscribeConnected) {
            subscribeSocket.connected = false;
            Qt.callLater(() => {
                subscribeSocket.connected = true;
            });
        }
    }

    function addSubscription(service) {
        if (activeSubscriptions.includes("all"))
            return;
        if (!activeSubscriptions.includes(service)) {
            const newSubs = [...activeSubscriptions, service];
            subscribe(newSubs);
        }
    }

    function removeSubscription(service) {
        if (activeSubscriptions.includes("all")) {
            const allServices = ["network", "loginctl", "freedesktop", "gamma", "bluetooth", "dwl", "brightness", "extworkspace"];
            const filtered = allServices.filter(s => s !== service);
            subscribe(filtered);
        } else {
            const filtered = activeSubscriptions.filter(s => s !== service);
            if (filtered.length === 0) {
                console.warn("DMSService: Cannot remove last subscription");
                return;
            }
            subscribe(filtered);
        }
    }

    function subscribeAll() {
        subscribe(["all"]);
    }

    function subscribeAllExcept(excludeServices) {
        if (!Array.isArray(excludeServices)) {
            excludeServices = [excludeServices];
        }

        const allServices = ["network", "loginctl", "freedesktop", "gamma", "bluetooth", "cups", "dwl", "brightness", "extworkspace"];
        const filtered = allServices.filter(s => !excludeServices.includes(s));
        subscribe(filtered);
    }

    function handleSubscriptionEvent(response) {
        if (response.error) {
            if (response.error.includes("unknown method") && response.error.includes("subscribe")) {
                if (!shownOutdatedError) {
                    console.error("DMSService: Server does not support subscribe method");
                    ToastService.showError(I18n.tr("DMS out of date"), I18n.tr("To update, run the following command:"), updateCommand);
                    shownOutdatedError = true;
                }
            }
            return;
        }

        if (!response.result) {
            return;
        }

        const service = response.result.service;
        const data = response.result.data;

        if (service === "server") {
            apiVersion = data.apiVersion || 0;
            cliVersion = data.cliVersion || "";
            capabilities = data.capabilities || [];

            console.info("DMSService: Connected (API v" + apiVersion + ", CLI " + cliVersion + ") -", JSON.stringify(capabilities));

            if (apiVersion < expectedApiVersion) {
                ToastService.showError("DMS server is outdated (API v" + apiVersion + ", expected v" + expectedApiVersion + ")");
            }

            capabilitiesReceived();
        } else if (service === "network") {
            networkStateUpdate(data);
        } else if (service === "network.credentials") {
            credentialsRequest(data);
        } else if (service === "loginctl") {
            if (data.event) {
                loginctlEvent(data);
            } else {
                loginctlStateUpdate(data);
            }
        } else if (service === "bluetooth.pairing") {
            bluetoothPairingRequest(data);
        } else if (service === "cups") {
            cupsStateUpdate(data);
        } else if (service === "dwl") {
            dwlStateUpdate(data);
        } else if (service === "brightness") {
            brightnessStateUpdate(data);
        } else if (service === "brightness.update") {
            if (data.device) {
                brightnessDeviceUpdate(data.device);
            }
        } else if (service === "extworkspace") {
            extWorkspaceStateUpdate(data);
        } else if (service === "wlroutput") {
            wlrOutputStateUpdate(data);
        } else if (service === "evdev") {
            if (data.capsLock !== undefined) {
                capsLockState = data.capsLock;
            }
            evdevStateUpdate(data);
        }
    }

    function sendRequest(method, params, callback) {
        if (!isConnected) {
            console.warn("DMSService.sendRequest: Not connected, method:", method);
            if (callback) {
                callback({
                    "error": "not connected to DMS socket"
                });
            }
            return;
        }

        requestIdCounter++;
        const id = Date.now() + requestIdCounter;
        const request = {
            "id": id,
            "method": method
        };

        if (params) {
            request.params = params;
        }

        if (callback) {
            pendingRequests[id] = callback;
        }

        console.log("DMSService.sendRequest: Sending request id=" + id + " method=" + method);
        requestSocket.send(request);
    }

    function handleResponse(response) {
        const callback = pendingRequests[response.id];

        if (callback) {
            delete pendingRequests[response.id];
            callback(response);
        }
    }

    function ping(callback) {
        sendRequest("ping", null, callback);
    }

    function listPlugins(callback) {
        sendRequest("plugins.list", null, response => {
            if (response.result) {
                availablePlugins = response.result;
                pluginsListReceived(response.result);
            }
            if (callback) {
                callback(response);
            }
        });
    }

    function listInstalled(callback) {
        sendRequest("plugins.listInstalled", null, response => {
            if (response.result) {
                installedPlugins = response.result;
                installedPluginsReceived(response.result);
            }
            if (callback) {
                callback(response);
            }
        });
    }

    function search(query, category, compositor, capability, callback) {
        const params = {
            "query": query
        };
        if (category) {
            params.category = category;
        }
        if (compositor) {
            params.compositor = compositor;
        }
        if (capability) {
            params.capability = capability;
        }

        sendRequest("plugins.search", params, response => {
            if (response.result) {
                searchResultsReceived(response.result);
            }
            if (callback) {
                callback(response);
            }
        });
    }

    function install(pluginName, callback) {
        sendRequest("plugins.install", {
            "name": pluginName
        }, response => {
            if (callback) {
                callback(response);
            }
            if (!response.error) {
                listInstalled();
            }
        });
    }

    function uninstall(pluginName, callback) {
        sendRequest("plugins.uninstall", {
            "name": pluginName
        }, response => {
            if (callback) {
                callback(response);
            }
            if (!response.error) {
                listInstalled();
            }
        });
    }

    function update(pluginName, callback) {
        sendRequest("plugins.update", {
            "name": pluginName
        }, response => {
            if (callback) {
                callback(response);
            }
            if (!response.error) {
                listInstalled();
            }
        });
    }

    function lockSession(callback) {
        sendRequest("loginctl.lock", null, callback);
    }

    function unlockSession(callback) {
        sendRequest("loginctl.unlock", null, callback);
    }

    function bluetoothPair(devicePath, callback) {
        sendRequest("bluetooth.pair", {
            "device": devicePath
        }, callback);
    }

    function bluetoothConnect(devicePath, callback) {
        sendRequest("bluetooth.connect", {
            "device": devicePath
        }, callback);
    }

    function bluetoothDisconnect(devicePath, callback) {
        sendRequest("bluetooth.disconnect", {
            "device": devicePath
        }, callback);
    }

    function bluetoothRemove(devicePath, callback) {
        sendRequest("bluetooth.remove", {
            "device": devicePath
        }, callback);
    }

    function bluetoothTrust(devicePath, callback) {
        sendRequest("bluetooth.trust", {
            "device": devicePath
        }, callback);
    }

    function bluetoothSubmitPairing(token, secrets, accept, callback) {
        sendRequest("bluetooth.pairing.submit", {
            "token": token,
            "secrets": secrets,
            "accept": accept
        }, callback);
    }

    function bluetoothCancelPairing(token, callback) {
        sendRequest("bluetooth.pairing.cancel", {
            "token": token
        }, callback);
    }
}