pragma Singleton

// Home Assistant state for the Control Center. Credentials and REST details
// remain behind the helper; QML receives configured favourites only.

import Quickshell
import Quickshell.Io
import QtQuick

Singleton {
    id: root

    readonly property string helperPath: Quickshell.shellDir + "/scripts/panama-home-assistant"

    // "loading" | "ready" | "degraded" | "unavailable"
    property string phase: "loading"
    property var entities: []
    property bool stale: false
    property string busyEntityId: ""
    property string lastError: ""
    property bool fixtureMode: false

    readonly property var visibleEntities: root.entities.slice(0, 4)
    readonly property int configuredCount: root.entities.length

    function refresh(): void {
        if (root.fixtureMode || refreshProc.running)
            return;
        if (root.entities.length === 0)
            root.phase = "loading";
        refreshProc.running = true;
    }

    function consumeSnapshot(text: string): void {
        if (root.fixtureMode)
            return;
        let result = null;
        try {
            result = JSON.parse(text);
        } catch (error) {
            result = { ok: false, error: "invalid-response" };
        }

        if (result.ok === true) {
            root.entities = Array.isArray(result.entities) ? result.entities : [];
            root.phase = "ready";
            root.stale = false;
            root.lastError = "";
            return;
        }

        root.lastError = String(result.error || "unreachable");
        if (root.entities.length > 0) {
            root.phase = "degraded";
            root.stale = true;
        } else {
            root.phase = "unavailable";
            root.stale = false;
        }
    }

    function toggleEntity(entityId: string): void {
        if (entityId === "" || root.busyEntityId !== "")
            return;
        if (root.fixtureMode) {
            root.entities = root.entities.map(entity => {
                if (entity.id !== entityId)
                    return entity;
                return Object.assign({}, entity, {
                    active: !entity.active,
                    state: entity.active ? "off" : "on"
                });
            });
            return;
        }
        if (!root.entities.some(entity => entity.id === entityId))
            return;
        root.busyEntityId = entityId;
        actionProc.command = [root.helperPath, "toggle", entityId];
        actionProc.running = true;
    }

    function consumeAction(text: string): void {
        if (root.busyEntityId === "")
            return;
        let ok = false;
        let errorCode = "action-failed";
        try {
            const result = JSON.parse(text);
            ok = result.ok === true;
            errorCode = String(result.error || errorCode);
        } catch (error) {
            errorCode = "invalid-response";
        }
        root.busyEntityId = "";
        if (ok) {
            root.lastError = "";
            refreshDelay.restart();
        } else {
            root.lastError = errorCode;
            if (root.entities.length > 0) {
                root.phase = "degraded";
                root.stale = true;
            }
        }
    }

    function open(): void {
        Quickshell.execDetached([root.helperPath, "open"]);
    }

    function fixtureEntities(): var {
        return [
            { id: "light.fixture_all", name: "All lights", domain: "light", state: "on", available: true, active: true },
            { id: "light.fixture_kitchen", name: "Kitchen", domain: "light", state: "on", available: true, active: true },
            { id: "light.fixture_living", name: "Living room", domain: "light", state: "off", available: true, active: false },
            { id: "light.fixture_bedroom", name: "Bedroom", domain: "light", state: "on", available: true, active: true },
            { id: "light.fixture_hall", name: "Hall", domain: "light", state: "off", available: true, active: false },
            { id: "light.fixture_desk", name: "Desk", domain: "light", state: "off", available: true, active: false },
            { id: "light.fixture_corner", name: "Corner lamp", domain: "light", state: "unavailable", available: false, active: false }
        ];
    }

    function applyFixture(name: string): void {
        if (["ready", "stale", "unavailable"].indexOf(name) < 0)
            return;
        root.fixtureMode = true;
        root.busyEntityId = "";
        if (name === "unavailable") {
            root.entities = [];
            root.phase = "unavailable";
            root.stale = false;
            root.lastError = "not-configured";
            return;
        }
        root.entities = root.fixtureEntities();
        root.phase = name === "stale" ? "degraded" : "ready";
        root.stale = name === "stale";
        root.lastError = name === "stale" ? "unreachable" : "";
    }

    function clearFixture(): void {
        root.fixtureMode = false;
        root.phase = "loading";
        root.entities = [];
        root.stale = false;
        root.busyEntityId = "";
        root.lastError = "";
        root.refresh();
    }

    Process {
        id: refreshProc
        command: [root.helperPath, "snapshot"]
        stdout: StdioCollector {
            onStreamFinished: root.consumeSnapshot(this.text)
        }
    }

    Process {
        id: actionProc
        stdout: StdioCollector {
            onStreamFinished: root.consumeAction(this.text)
        }
        onExited: (code, status) => {
            if (root.busyEntityId !== "")
                root.consumeAction("");
        }
    }

    Timer {
        interval: 60000
        repeat: true
        running: ShellState.quickSettingsOpen && !root.fixtureMode
        onTriggered: root.refresh()
    }

    Timer {
        id: refreshDelay
        interval: 350
        onTriggered: root.refresh()
    }

    Component.onCompleted: root.refresh()
}