import { Download } from "lucide-react"
import React from "react";
import { useObservabilityData } from "../hooks/useObservabilityData";

export const CommandAndQueryBar: React.FC = () => {
  const {
    logs,
    traces,
    metrics,
    searchQuery,
    setSearchQuery,

    showErrorsOnly,
    setShowErrorsOnly,
    selectedServices,
    toggleService,
    resetFilters,
    minDurationMs,
    setMinDurationMs,
    timeWindow,
    setTimeWindow,
  } = useObservabilityData();

  const totalFilteredEvents = logs.length + traces.length + metrics.length;

  const exportNDJSON = () => {
    const records = [
      ...traces.map((t) => JSON.stringify({ type: "traces", ...t })),
      ...logs.map((l) => JSON.stringify({ type: "logs", ...l })),
      ...metrics.map((m) => JSON.stringify({ type: "metrics", ...m })),
    ].join("\n");

    const blob = new Blob([records], { type: "application/x-ndjson" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = `hyperscope-filtered-telemetry-${new Date().toISOString()}.ndjson`;
    a.click();
    URL.revokeObjectURL(url);
  };

  const hasActiveFilters =
    Boolean(searchQuery) ||
    showErrorsOnly ||
    selectedServices.size > 0 ||
    minDurationMs > 0 ||
    timeWindow !== "all";

  return (
    <div className="flex flex-col gap-2.5 mb-4 font-body">
      {/* Filter and Telemetry Status Bar */}
      <div className="flex flex-wrap items-center justify-between gap-2.5 p-3 rounded-xl bg-ds-bg border border-ds-line">
        <div className="flex items-center gap-2 flex-wrap">
          <span className="font-mono text-[10px] text-ds-text-3 uppercase tracking-wider font-semibold shrink-0">
            Active Context:
          </span>

          <span className="font-mono text-xs text-ds-accent font-semibold">
            {totalFilteredEvents} Signals ({timeWindow === "all" ? "All Time" : `Last ${timeWindow}`})
          </span>

          {/* Selected Service Pills */}
          {Array.from(selectedServices).map((service) => (
            <span
              key={service}
              className="inline-flex items-center gap-1 rounded-full bg-ds-accent-bg text-ds-accent border border-ds-line px-2.5 py-0.5 font-mono text-xs font-semibold"
            >
              <span>service:{service}</span>
              <button
                type="button"
                onClick={() => toggleService(service)}
                className="hover:text-ds-text"
              >
                ×
              </button>
            </span>
          ))}

          {/* Errors Only Pill */}
          {showErrorsOnly && (
            <span className="inline-flex items-center gap-1 rounded-full bg-ds-critical-bg text-ds-critical px-2.5 py-0.5 font-mono text-xs font-semibold">
              <span>Errors Only</span>
              <button
                type="button"
                onClick={() => setShowErrorsOnly(false)}
                className="hover:text-ds-text"
              >
                ×
              </button>
            </span>
          )}

          {/* Slow Spans Pill */}
          {minDurationMs > 0 && (
            <span className="inline-flex items-center gap-1 rounded-full bg-ds-warn-bg text-ds-warn border border-ds-warn/40 px-2.5 py-0.5 font-mono text-xs font-semibold">
              <span>Latency &gt;{minDurationMs}ms</span>
              <button
                type="button"
                onClick={() => setMinDurationMs(0)}
                className="hover:text-ds-text"
              >
                ×
              </button>
            </span>
          )}

          {/* Search Query Pill */}
          {searchQuery && (
            <span className="inline-flex items-center gap-1 rounded-full bg-ds-surface-2 text-ds-text border border-ds-line px-2.5 py-0.5 font-mono text-xs">
              <span>query: &quot;{searchQuery}&quot;</span>
              <button
                type="button"
                onClick={() => setSearchQuery("")}
                className="hover:text-ds-text"
              >
                ×
              </button>
            </span>
          )}

          {hasActiveFilters && (
            <button
              type="button"
              onClick={() => {
                resetFilters();
                setMinDurationMs(0);
                setTimeWindow("all");
              }}
              className="text-ds-text-3 hover:text-ds-text font-mono text-xs underline ml-1"
            >
              Clear all
            </button>
          )}
        </div>

        {/* Export and Action buttons */}
        <div className="flex items-center gap-2">
          <button
            type="button"
            onClick={exportNDJSON}
            className="flex items-center gap-1 px-2.5 py-1 bg-ds-surface hover:bg-ds-surface-2 text-ds-text font-mono text-xs rounded-lg transition-colors border border-ds-line"
            title="Export currently filtered telemetry signals as NDJSON"
          >
            <Download className="h-[15px] w-[15px] shrink-0" aria-hidden="true" />
            <span>Export NDJSON</span>
          </button>
        </div>
      </div>
    </div>
  );
};

export default CommandAndQueryBar;