(function () {
    "use strict";

    if (document.body.dataset.view !== "dashboard") return;

    const ids = [
        "dashboardLoading", "dashboardError", "dashboardErrorDetail",
        "dashboardRetry", "dashboardEmpty", "dashboardContent",
        "dashboardLoadStatus", "dashboardFleetTotal", "dashboardRuntimeOnline",
        "dashboardRuntimeOffline", "dashboardRuntimeUnknown",
        "dashboardLifecycleRepair", "dashboardLifecycleSpare",
        "dashboardLifecycleRetired", "dashboardAttentionOffline",
        "dashboardAttentionUnknown", "dashboardAttentionUnstable",
        "dashboardAttentionRepair", "dashboardActiveRepairs",
        "dashboardRepairStatuses", "dashboardSites", "dashboardRooms",
        "dashboardPositions", "dashboardOccupied", "dashboardEmptyPositions",
        "dashboardMappedMiners", "dashboardUnmappedMiners"
    ];
    const el = {};
    for (const id of ids) el[id] = document.getElementById(id);
    let controller = null;

    const STATUS_LABELS = {
        OPEN: "Open",
        IN_PROGRESS: "In progress",
        WAITING_FOR_PARTS: "Waiting for parts",
        READY_FOR_TEST: "Ready for test",
        open: "Open",
        diagnosing: "Diagnosing",
        waiting_parts: "Waiting parts",
        in_progress: "In progress",
        testing: "Testing",
        ready_to_shelf: "Ready to shelf",
        needs_followup: "Needs follow-up",
        repair: "In repair",
        unknown: "Unknown"
    };

    function setCount(node, value) {
        if (node) node.textContent = Number.isInteger(value) ? String(value) : "Unavailable";
    }

    function show(name) {
        el.dashboardLoading.hidden = name !== "loading";
        el.dashboardError.hidden = name !== "error";
        el.dashboardEmpty.hidden = name !== "empty";
        el.dashboardContent.hidden = name !== "ready";
    }

    function statusLabel(value) {
        if (Object.prototype.hasOwnProperty.call(STATUS_LABELS, value)) {
            return STATUS_LABELS[value];
        }
        return String(value || "Unknown").replaceAll("_", " ");
    }

    function renderFleet(fleet) {
        if (!fleet || !el.dashboardFleetTotal) return;
        setCount(el.dashboardFleetTotal, fleet.total);
        setCount(el.dashboardRuntimeOnline, fleet.runtime_online);
        setCount(el.dashboardRuntimeOffline, fleet.runtime_offline);
        setCount(el.dashboardRuntimeUnknown, fleet.runtime_unknown);
        setCount(el.dashboardLifecycleRepair, fleet.lifecycle_in_repair);
        setCount(el.dashboardLifecycleSpare, fleet.lifecycle_spare);
        setCount(el.dashboardLifecycleRetired, fleet.lifecycle_retired);
        const attention = fleet.attention || {};
        setCount(el.dashboardAttentionOffline, attention.offline);
        setCount(el.dashboardAttentionUnknown, attention.unknown);
        setCount(el.dashboardAttentionUnstable, attention.unstable);
        setCount(el.dashboardAttentionRepair, attention.repair);
    }

    function renderRepairs(repairs) {
        if (!repairs || !el.dashboardActiveRepairs) return;
        setCount(el.dashboardActiveRepairs, repairs.active);
        const entries = Object.entries(repairs.status_counts || {}).sort(function (left, right) {
            return statusLabel(left[0]).localeCompare(statusLabel(right[0]));
        });
        el.dashboardRepairStatuses.replaceChildren();
        if (!entries.length) {
            const row = document.createElement("div");
            const term = document.createElement("dt");
            const value = document.createElement("dd");
            term.textContent = "No active repair statuses";
            value.textContent = "0";
            row.append(term, value);
            el.dashboardRepairStatuses.appendChild(row);
            return;
        }
        for (const [status, count] of entries) {
            const row = document.createElement("div");
            const term = document.createElement("dt");
            const link = document.createElement("a");
            const value = document.createElement("dd");
            const params = new URLSearchParams({ scope: "active", status: status });
            link.href = "/operations/repairs?" + params.toString();
            link.textContent = statusLabel(status);
            term.appendChild(link);
            value.textContent = Number.isInteger(count) ? String(count) : "Unavailable";
            row.append(term, value);
            el.dashboardRepairStatuses.appendChild(row);
        }
    }

    function renderLocations(locations) {
        if (!locations || !el.dashboardSites) return;
        setCount(el.dashboardSites, locations.sites);
        setCount(el.dashboardRooms, locations.rooms);
        setCount(el.dashboardPositions, locations.positions);
        setCount(el.dashboardOccupied, locations.occupied_positions);
        setCount(el.dashboardEmptyPositions, locations.empty_positions);
        setCount(el.dashboardMappedMiners, locations.mapped_miners);
        setCount(el.dashboardUnmappedMiners, locations.unmapped_miners);
    }

    async function loadOverview() {
        if (controller) controller.abort();
        controller = new AbortController();
        show("loading");
        try {
            const response = await fetch("/api/dashboard/overview", {
                credentials: "same-origin",
                headers: { Accept: "application/json" },
                signal: controller.signal
            });
            if (response.status === 401) {
                window.location.replace("/login?next=" + encodeURIComponent("/dashboard"));
                return;
            }
            if (!response.ok) throw new Error("The overview service returned " + response.status + ".");
            const payload = await response.json();
            const data = payload && payload.data ? payload.data : {};
            const available = payload && payload.meta ? payload.meta.available_sections || [] : [];
            if (!available.length) {
                show("empty");
                return;
            }
            renderFleet(data.fleet);
            renderRepairs(data.repairs);
            renderLocations(data.locations);
            const generated = new Date(data.generated_at);
            el.dashboardLoadStatus.textContent = Number.isNaN(generated.valueOf())
                ? "Operational summary loaded"
                : "Operational summary generated " + generated.toLocaleString();
            show("ready");
        } catch (error) {
            if (error.name === "AbortError") return;
            el.dashboardErrorDetail.textContent = error.message || "The operational overview could not be loaded.";
            show("error");
        }
    }

    el.dashboardRetry.addEventListener("click", loadOverview);
    loadOverview();
}());