<script lang="ts">
    import { onMount } from "svelte";
    import { eventHub } from "@/common/events";
    import { delay, fireAndForget } from "octagonal-wheels/promises";
    import type { P2PServerInfo } from "@vrtmrz/livesync-commonlib/compat/replication/trystero/TrysteroReplicatorP2PServer";
    import {
        EVENT_SERVER_STATUS,
        EVENT_REQUEST_STATUS,
        EVENT_P2P_REPLICATOR_STATUS,
    } from "@vrtmrz/livesync-commonlib/compat/replication/trystero/TrysteroReplicatorP2PServer";
    import { EVENT_SETTING_SAVED } from "@vrtmrz/livesync-commonlib/compat/events/coreEvents";
    import type { P2PServiceViews } from "@vrtmrz/livesync-commonlib/p2p";
    import type { P2PReplicatorStatus } from "@vrtmrz/livesync-commonlib/compat/replication/trystero/TrysteroReplicator";
    import { extractP2PRoomSuffix } from "@vrtmrz/livesync-commonlib/compat/common/utils";
    import type { LiveSyncBaseCore } from "@/LiveSyncBaseCore";
    import { $msg as translateMessage } from "@/common/translation";

    interface Props {
        p2p: P2PServiceViews;
        showBroadcastToggle?: boolean;
        core?: LiveSyncBaseCore;
    }

    let { p2p, showBroadcastToggle = true, core }: Props = $props();
    let serverInfo = $state<P2PServerInfo | undefined>(undefined);
    let replicatorStatus = $state<P2PReplicatorStatus | undefined>(undefined);
    // Later setting changes arrive through EVENT_SETTING_SAVED; these values only seed local state at mount time.
    const readCurrentSettings = () => core?.services.setting.currentSettings();
    const initialSettings = readCurrentSettings();
    let roomSuffix = $state<string>(extractP2PRoomSuffix(initialSettings?.P2P_roomID ?? ""));
    let useDiagRTC = $state<boolean>(initialSettings?.P2P_useDiagRTC ?? false);

    async function requestServerStatus() {
        p2p.diagnostics.requestStatus();
        eventHub.emitEvent(EVENT_REQUEST_STATUS);
    }

    async function onOpenConnection() {
        await p2p.transportLifecycle.connect();
        await requestServerStatus();
    }

    async function onDisconnect() {
        await p2p.transportLifecycle.disconnect();
        await requestServerStatus();
    }

    function toggleBroadcast() {
        if (replicatorStatus?.isBroadcasting) {
            p2p.changeRelay.disableBroadcastChanges();
        } else {
            p2p.changeRelay.enableBroadcastChanges();
        }
    }

    async function toggleDiagRTC() {
        if (!core) {
            return;
        }
        const next = !useDiagRTC;
        await core.services.setting.updateSettings((settings) => {
            settings.P2P_useDiagRTC = next;
            return settings;
        }, true);
        useDiagRTC = next;
    }

    onMount(() => {
        const unsubscribe = eventHub.onEvent(EVENT_SERVER_STATUS, (status) => {
            serverInfo = status;
            roomSuffix = extractP2PRoomSuffix(status?.roomId ?? "");
        });
        const unsubscribeStatus = eventHub.onEvent(EVENT_P2P_REPLICATOR_STATUS, (status) => {
            replicatorStatus = status;
        });
        const unsubscribeSettings = eventHub.onEvent(EVENT_SETTING_SAVED, (settings) => {
            roomSuffix = extractP2PRoomSuffix(settings?.P2P_roomID ?? "");
            useDiagRTC = settings?.P2P_useDiagRTC ?? false;
        });

        fireAndForget(async () => {
            await delay(100);
            await requestServerStatus();
        });

        return () => {
            unsubscribe();
            unsubscribeStatus();
            unsubscribeSettings();
        };
    });

    const isConnected = $derived.by(() => serverInfo?.isConnected);
    const isBroadcasting = $derived.by(() => replicatorStatus?.isBroadcasting ?? false);
</script>

<div class="server-status">
    <h3>{translateMessage("Signalling Status")}</h3>

    <div class="status-item">
        <span>{translateMessage("Connection:")}</span>
        <span class="status-value {isConnected ? 'connected' : 'disconnected'}">
            {isConnected ? translateMessage("🟢 Connected") : translateMessage("🔴 Disconnected")}
        </span>
    </div>

    <div class="status-item status-action">
        {#if !isConnected}
            <button onclick={onOpenConnection}>{translateMessage("Open connection")}</button>
        {:else}
            <button onclick={onDisconnect}>{translateMessage("Disconnect")}</button>
        {/if}
    </div>

    {#if serverInfo}
        <div class="status-item">
            <span>{translateMessage("Room ID suffix:")}</span>
            <span class="room-suffix-display" title={roomSuffix || translateMessage("Not configured")}>
                {roomSuffix || "-"}
            </span>
        </div>

        <div class="status-item">
            <span>{translateMessage("Peer ID:")}</span>
            <span class="peer-id-display" title={serverInfo.serverPeerId}>
                {serverInfo.serverPeerId.slice(0, 12)}...
            </span>
        </div>

        <div class="status-item">
            <span>{translateMessage("Devices:")}</span>
            <span>{serverInfo.knownAdvertisements.length}</span>
        </div>
    {/if}

    {#if showBroadcastToggle}
    <div class="status-item status-action broadcast-row">
        <label class="broadcast-label" for="broadcast-toggle">
            {translateMessage("Announce changes")}
        </label>
        <button
            id="broadcast-toggle"
            class="broadcast-button {isBroadcasting ? 'is-on' : 'is-off'}"
            onclick={toggleBroadcast}
            title={isBroadcasting
                ? translateMessage("Stop announcing changes")
                : translateMessage("Start announcing changes")}
        >
            {isBroadcasting ? translateMessage("📡 On") : translateMessage("📡 Off")}
        </button>
    </div>
    {/if}

    {#if core}
    <div class="status-item status-action diag-toggle-row">
        <label class="broadcast-label" for="diag-toggle">
            {translateMessage("🕵️ Diag")}
        </label>
        <button
            id="diag-toggle"
            class="broadcast-button {useDiagRTC ? 'is-on' : 'is-off'}"
            onclick={toggleDiagRTC}
            title={useDiagRTC
                ? translateMessage("Diagnostic RTCPeerConnection is enabled")
                : translateMessage("Use Diagnostic RTCPeerConnection for statistics")}
        >
            {useDiagRTC ? translateMessage("On") : translateMessage("Off")}
        </button>
    </div>
    {/if}

    {#if serverInfo}
        <div class="diag-section">
            <h4>{translateMessage("Stats")}</h4>
            <div class="diag-grid">
                <div class="diag-item">
                    <span>{translateMessage("Incoming:")}</span>
                    <span>{serverInfo.diag.totalNewConnections}</span>
                </div>
                <div class="diag-item">
                    <span>{translateMessage("Connected:")}</span>
                    <span>{serverInfo.diag.totalSuccessfulConnections}</span>
                </div>
                <div class="diag-item">
                    <span>{translateMessage("Failed:")}</span>
                    <span>{serverInfo.diag.totalFailedConnections}</span>
                </div>
                <div class="diag-item">
                    <span>{translateMessage("Closed:")}</span>
                    <span>{serverInfo.diag.totalClosedConnections}</span>
                </div>
            </div>
        </div>
    {/if}
</div>

<style>
    .server-status {
        border: 1px solid var(--divider-color);
        border-radius: 0.5rem;
        padding: 1rem;
    }

    h3 {
        margin: 0 0 0.75rem 0;
        font-weight: 600;
        font-size: 1rem;
    }

    .status-item {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }

    .status-action {
        align-items: center;
        gap: 0.5rem;
    }

    .status-value {
        font-weight: 500;
    }

    .status-value.connected {
        color: var(--text-success);
    }

    .status-value.disconnected {
        color: var(--text-error);
    }

    .peer-id-display {
        font-family: monospace;
        font-size: 0.85rem;
        max-width: 150px;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .room-suffix-display {
        font-family: monospace;
        font-size: 0.85rem;
        font-weight: 600;
    }

    .broadcast-row {
        align-items: center;
        margin-top: 0.25rem;
    }

    .diag-toggle-row {
        align-items: center;
        margin-top: 0.25rem;
    }

    .broadcast-label {
        font-size: 0.9rem;
        color: var(--text-normal);
        cursor: pointer;
    }

    .broadcast-button {
        font-size: 0.8rem;
        padding: 0.2rem 0.6rem;
        border: 1px solid var(--divider-color);
        border-radius: 0.4rem;
        cursor: pointer;
        font-weight: 600;
        transition: background-color 0.15s;
    }

    .broadcast-button.is-on {
        background-color: var(--interactive-accent);
        color: var(--text-on-accent);
        border-color: var(--interactive-accent);
    }

    .broadcast-button.is-off {
        background-color: var(--interactive-normal);
        color: var(--text-muted);
    }

    .broadcast-button.is-off:hover {
        background-color: var(--interactive-hover);
        color: var(--text-normal);
    }

    .diag-section {
        border-top: 1px solid var(--divider-color);
        margin-top: 0.75rem;
        padding-top: 0.75rem;
    }

    .diag-section h4 {
        margin: 0 0 0.5rem 0;
        font-size: 0.9rem;
        font-weight: 600;
    }

    .diag-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
        gap: 0.35rem 0.75rem;
    }

    .diag-item {
        display: flex;
        justify-content: space-between;
        font-size: 0.85rem;
        gap: 0.5rem;
    }
</style>
