// How often to fetch status (ms)
const REFRESH_INTERVAL = 60_000;

// Status severity for sorting (higher = more severe = shown first)
const SEVERITY = { outage: 3, degraded: 2, unknown: 1, operational: 0 };

// Track first render for entrance animation
let initialLoad = true;

// Simple HTML escaping for template safety
function esc(str) {
    const el = document.createElement("span");
    el.textContent = str;
    return el.innerHTML;
}

// Mock data — will be replaced by /api/status once the backend is wired up
function getMockData() {
    return [
        {
            name: "Microsoft 365",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 120_000).toISOString()
        },
        {
            name: "SpamTitan",
            status: "operational",
            message: "Email filtering operational.",
            lastUpdated: new Date(Date.now() - 300_000).toISOString()
        },
        {
            name: "PowerSchool",
            status: "degraded",
            message: "Slow response times reported. PowerSchool is investigating.",
            lastUpdated: new Date(Date.now() - 60_000).toISOString()
        },
        {
            name: "Classlink",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 180_000).toISOString()
        },
        {
            name: "Apple",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 600_000).toISOString()
        },
        {
            name: "DRC",
            status: "outage",
            message: "INSIGHT portal is currently unavailable. DRC is aware of the issue.",
            lastUpdated: new Date(Date.now() - 45_000).toISOString()
        },
        {
            name: "FinalSite",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 240_000).toISOString()
        },
        {
            name: "Google Workspace",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 90_000).toISOString()
        },
        {
            name: "Follett",
            status: "operational",
            message: "All services running normally.",
            lastUpdated: new Date(Date.now() - 350_000).toISOString()
        },
        {
            name: "EdInsight",
            status: "operational",
            message: "Data analytics platform operational.",
            lastUpdated: new Date(Date.now() - 200_000).toISOString()
        },
        {
            name: "Raptor",
            status: "operational",
            message: "Visitor management online.",
            lastUpdated: new Date(Date.now() - 400_000).toISOString()
        },
        {
            name: "SchoolMessenger",
            status: "operational",
            message: "Messaging services operational.",
            lastUpdated: new Date(Date.now() - 150_000).toISOString()
        },
        {
            name: "Fortinet",
            status: "operational",
            message: "FortiGuard and FortiCloud services operational.",
            lastUpdated: new Date(Date.now() - 500_000).toISOString()
        },
        {
            name: "McGraw Hill",
            status: "operational",
            message: "All platform services operational.",
            lastUpdated: new Date(Date.now() - 270_000).toISOString()
        },
        {
            name: "Local Infrastructure",
            status: "operational",
            message: "Firewall uptime 42d. WAN throughput nominal.",
            lastUpdated: new Date(Date.now() - 30_000).toISOString()
        }
    ];
}

// Fetch vendor status from the backend API, falling back to mock data
async function fetchStatus() {
    try {
        const res = await fetch("/api/status");
        if (!res.ok) throw new Error(res.statusText);
        return await res.json();
    } catch {
        // Backend not available yet — use mock data
        return getMockData();
    }
}

// Format an ISO timestamp as a relative or short local time string
function formatTime(iso) {
    const diff = Date.now() - new Date(iso).getTime();
    const mins = Math.floor(diff / 60_000);
    if (mins < 1) return "just now";
    if (mins < 60) return `${mins}m ago`;
    const hrs = Math.floor(mins / 60);
    if (hrs < 24) return `${hrs}h ago`;
    return new Date(iso).toLocaleDateString();
}

// Render the summary bar (counts by status)
function renderSummary(vendors) {
    const counts = { operational: 0, degraded: 0, outage: 0, unknown: 0 };
    vendors.forEach(v => { counts[v.status] = (counts[v.status] || 0) + 1; });

    const bar = document.getElementById("summary-bar");
    const items = [];

    if (counts.outage > 0) {
        items.push(`<div class="summary-item">
            <span class="summary-dot outage"></span>
            <span class="summary-count">${counts.outage}</span> Outage
        </div>`);
    }
    if (counts.degraded > 0) {
        items.push(`<div class="summary-item">
            <span class="summary-dot degraded"></span>
            <span class="summary-count">${counts.degraded}</span> Degraded
        </div>`);
    }
    items.push(`<div class="summary-item">
        <span class="summary-dot operational"></span>
        <span class="summary-count">${counts.operational}</span> Operational
    </div>`);
    if (counts.unknown > 0) {
        items.push(`<div class="summary-item">
            <span class="summary-dot unknown"></span>
            <span class="summary-count">${counts.unknown}</span> Unknown
        </div>`);
    }

    bar.innerHTML = items.join("");
}

// Render vendor cards into the grid, sorted by severity
function renderGrid(vendors) {
    const sorted = [...vendors].sort((a, b) => {
        const severityDiff = (SEVERITY[b.status] || 0) - (SEVERITY[a.status] || 0);
        if (severityDiff !== 0) return severityDiff;
        return a.name.localeCompare(b.name);
    });

    const grid = document.getElementById("vendor-grid");
    grid.innerHTML = sorted.map((v, i) => {
        const animClass = initialLoad ? "animate-in" : "";
        const animStyle = initialLoad ? `style="--d: ${i * 0.07}s"` : "";

        const nameHtml = v.url
            ? `<a href="${esc(v.url)}" target="_blank" rel="noopener" class="vendor-link">${esc(v.name)}</a>`
            : esc(v.name);

        return `<div class="vendor-card ${esc(v.status)} ${animClass}" ${animStyle}>
            <div class="card-header">
                <div class="vendor-identity">
                    <span class="status-indicator ${esc(v.status)}"></span>
                    <span class="vendor-name">${nameHtml}</span>
                </div>
                <span class="status-badge ${esc(v.status)}">${esc(v.status)}</span>
            </div>
            <p class="vendor-message">${esc(v.message)}</p>
            <span class="vendor-updated">Updated ${esc(formatTime(v.lastUpdated))}</span>
        </div>`;
    }).join("");

    if (initialLoad) initialLoad = false;
}

// Orchestrate a full render pass
function render(vendors) {
    renderSummary(vendors);
    renderGrid(vendors);
    document.getElementById("last-refreshed").textContent =
        `Refreshed ${new Date().toLocaleTimeString()}`;
}

// Update the live clock display
function updateClock() {
    document.getElementById("clock").textContent =
        new Date().toLocaleTimeString([], {
            hour: "2-digit", minute: "2-digit", second: "2-digit"
        });
}

// Fetch and render
async function refresh() {
    const vendors = await fetchStatus();
    render(vendors);
}

// Initialize
updateClock();
setInterval(updateClock, 1000);
refresh();
setInterval(refresh, REFRESH_INTERVAL);