"use client";

/**
 * One entry in an incident's call spine — UI_REDESIGN.md §5.2. Replaces
 * CallRow for this context (CallRow stays in use for the Archive table
 * until chunk 12). `stopNumber` is the same index the map's path stops use
 * (see IncidentPathLayer in MapView.tsx) — that shared index is the one
 * memorable thing per §2.4: "where was he when he said that" is answered
 * by looking, not cross-referencing timestamps.
 */
import { useEffect, useRef, useState } from "react";
import type { CallRecord } from "@/lib/types";
import { c2api } from "@/lib/c2api";
import { isKnownSeverity, SEVERITY_COLORS } from "@/lib/severity";

function fmtTime(iso: string): string {
  return new Date(iso).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" });
}
function fmtClock(s: number): string {
  if (!Number.isFinite(s)) return "0:00";
  const m = Math.floor(s / 60);
  const r = Math.floor(s % 60);
  return `${m}:${r.toString().padStart(2, "0")}`;
}

function InlinePlayer({ callId }: { callId: string }) {
  const [url, setUrl] = useState<string | null>(null);
  const [error, setError] = useState(false);
  const [loading, setLoading] = useState(false);
  const [playing, setPlaying] = useState(false);
  const [current, setCurrent] = useState(0);
  const [duration, setDuration] = useState(0);
  const audioRef = useRef<HTMLAudioElement | null>(null);

  async function ensureUrl() {
    if (url || loading) return;
    setLoading(true);
    try {
      const full = await c2api.getCall(callId);
      setUrl(full.audio_url ?? null);
      if (!full.audio_url) setError(true);
    } catch {
      setError(true);
    } finally {
      setLoading(false);
    }
  }

  async function toggle() {
    if (!url) {
      await ensureUrl();
      return;
    }
    const el = audioRef.current;
    if (!el) return;
    if (playing) el.pause();
    else el.play();
  }

  // Once the URL lands, autoplay (the click that fetched it was the play intent).
  useEffect(() => {
    if (url && audioRef.current) audioRef.current.play().catch(() => {});
  }, [url]);

  if (error) {
    return <span className="text-xs text-sev-major">Audio unavailable</span>;
  }

  return (
    <div className="flex items-center gap-2 w-full max-w-xs" onClick={(e) => e.stopPropagation()}>
      <button
        onClick={toggle}
        disabled={loading}
        className="w-6 h-6 shrink-0 rounded-full bg-accent text-white flex items-center justify-center text-[10px] disabled:opacity-50"
        title={playing ? "Pause" : "Play"}
      >
        {loading ? "…" : playing ? "❚❚" : "▶"}
      </button>
      <input
        type="range"
        min={0}
        max={duration || 0}
        value={current}
        onChange={(e) => {
          const t = Number(e.target.value);
          if (audioRef.current) audioRef.current.currentTime = t;
          setCurrent(t);
        }}
        className="flex-1 h-1 accent-accent"
        disabled={!url}
      />
      <span className="text-[10px] font-mono text-ink-muted tabular-nums shrink-0">
        {fmtClock(current)}
      </span>
      {url && (
        <audio
          ref={audioRef}
          src={url}
          onPlay={() => setPlaying(true)}
          onPause={() => setPlaying(false)}
          onEnded={() => setPlaying(false)}
          onTimeUpdate={(e) => setCurrent(e.currentTarget.currentTime)}
          onLoadedMetadata={(e) => setDuration(e.currentTarget.duration)}
          className="hidden"
        />
      )}
    </div>
  );
}

function StopMarker({ stopNumber, color }: { stopNumber?: number; color: string }) {
  if (!stopNumber) {
    return <span className="w-6 h-6 shrink-0 rounded-full border border-line-strong" />;
  }
  return (
    <span
      className="w-6 h-6 shrink-0 rounded-full flex items-center justify-center text-[11px] font-semibold text-page"
      style={{ background: color }}
    >
      {stopNumber}
    </span>
  );
}

export function CallSpineEntry({
  call,
  stopNumber,
  isAdmin,
}: {
  call: CallRecord;
  stopNumber?: number;
  isAdmin?: boolean;
}) {
  const [expanded, setExpanded] = useState(false);
  const hasAudio = !!(call.audio_gcs_uri || call.audio_url);
  const transcript = call.transcript_corrected || call.transcript;
  const color = isKnownSeverity(call.severity) ? SEVERITY_COLORS[call.severity] : "var(--ink-muted)";
  const substantive = !!transcript || (call.units && call.units.length > 0) || !!call.location_coords;

  const units = call.units ?? [];
  const clearedInCall = call.cleared_units ?? [];

  if (!substantive) {
    // Thin/routine calls collapse to a single line.
    return (
      <div className="flex items-center gap-3 py-1.5 text-xs text-ink-muted">
        <span className="w-6 shrink-0" />
        <span className="font-mono tabular-nums shrink-0">{fmtTime(call.started_at)}</span>
        <span className="truncate">TG {call.talkgroup_name ?? call.talkgroup_id ?? "—"} · status only</span>
      </div>
    );
  }

  return (
    <div className="flex gap-3 py-3">
      <div className="flex flex-col items-center shrink-0">
        <StopMarker stopNumber={stopNumber} color={color} />
        <span className="flex-1 w-px bg-line mt-1" />
      </div>
      <div className="flex-1 min-w-0 pb-1">
        <div className="flex items-center gap-2 flex-wrap text-xs text-ink-muted">
          <span className="font-mono tabular-nums">{fmtTime(call.started_at)}</span>
          <span>·</span>
          <span className="font-mono">TG {call.talkgroup_name ?? call.talkgroup_id ?? "—"}</span>
          <span className="font-mono">{call.node_id}</span>
        </div>

        {hasAudio && (
          <div className="mt-1.5">
            <InlinePlayer callId={call.call_id} />
          </div>
        )}

        {transcript && (
          <p
            className={`text-sm text-ink leading-relaxed mt-1.5 ${!expanded ? "line-clamp-2" : ""}`}
            onClick={() => setExpanded((v) => !v)}
          >
            {transcript}
          </p>
        )}

        <div className="flex flex-wrap items-center gap-1.5 mt-1.5">
          {call.location && (
            <span className="text-xs px-2 py-0.5 rounded-full bg-raised text-ink-2">{call.location}</span>
          )}
          {units.map((u) => (
            <span key={u} className="text-xs px-2 py-0.5 rounded-full bg-raised text-ink-2 font-mono">{u}</span>
          ))}
          {clearedInCall.map((u) => (
            <span key={u} className="text-xs px-2 py-0.5 rounded-full bg-transparent border border-line text-ink-muted font-mono line-through">{u}</span>
          ))}
        </div>

        {isAdmin && call.corr_path && (
          <p className="text-[10px] font-mono text-ink-muted mt-1">corr: {call.corr_path}</p>
        )}
      </div>
    </div>
  );
}