"use client";

import { useState } from "react";
import { useAuth } from "@/components/AuthProvider";
import { useAlerts } from "@/lib/useAlerts";
import { c2api } from "@/lib/c2api";
import type { AlertRule } from "@/lib/types";

function fmtTime(iso: string) {
  try { return new Date(iso).toLocaleString(); } catch { return iso; }
}

function RulesTab({ isAdmin }: { isAdmin: boolean }) {
  const [rules, setRules] = useState<AlertRule[]>([]);
  const [loaded, setLoaded] = useState(false);
  const [name, setName] = useState("");
  const [keywords, setKeywords] = useState("");
  const [tgIds, setTgIds] = useState("");
  const [webhook, setWebhook] = useState("");
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);

  async function load() {
    if (loaded) return;
    try {
      const data = await c2api.getAlertRules() as AlertRule[];
      setRules(data);
      setLoaded(true);
    } catch (e) {
      console.error(e);
    }
  }

  // Load on first render of this tab
  if (!loaded) { load(); }

  async function handleCreate(e: React.FormEvent) {
    e.preventDefault();
    setSaving(true);
    setError(null);
    try {
      const body = {
        name,
        keywords: keywords.split(",").map((k) => k.trim()).filter(Boolean),
        talkgroup_ids: tgIds.split(",").map((s) => parseInt(s.trim(), 10)).filter((n) => !isNaN(n)),
        enabled: true,
        discord_webhook: webhook || null,
      };
      const created = await c2api.createAlertRule(body) as AlertRule;
      setRules((prev) => [created, ...prev]);
      setName(""); setKeywords(""); setTgIds(""); setWebhook("");
    } catch {
      setError("Failed to create rule.");
    } finally {
      setSaving(false);
    }
  }

  async function handleToggle(rule: AlertRule) {
    try {
      await c2api.updateAlertRule(rule.rule_id, { enabled: !rule.enabled });
      setRules((prev) => prev.map((r) => r.rule_id === rule.rule_id ? { ...r, enabled: !r.enabled } : r));
    } catch (e) { console.error(e); }
  }

  async function handleDelete(id: string) {
    try {
      await c2api.deleteAlertRule(id);
      setRules((prev) => prev.filter((r) => r.rule_id !== id));
    } catch (e) { console.error(e); }
  }

  return (
    <div className="space-y-6">
      {isAdmin && (
        <form onSubmit={handleCreate} className="bg-gray-900 border border-gray-800 rounded-xl p-5 space-y-4">
          <h3 className="text-white font-mono text-sm font-bold">New Alert Rule</h3>
          <div className="grid grid-cols-2 gap-4">
            <div>
              <label className="text-xs text-gray-400 block mb-1">Name</label>
              <input
                required value={name} onChange={(e) => setName(e.target.value)}
                placeholder="e.g. Structure Fire"
                className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
              />
            </div>
            <div>
              <label className="text-xs text-gray-400 block mb-1">Keywords (comma-separated)</label>
              <input
                value={keywords} onChange={(e) => setKeywords(e.target.value)}
                placeholder="fire, smoke, structure"
                className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
              />
            </div>
            <div>
              <label className="text-xs text-gray-400 block mb-1">Talkgroup IDs (comma-separated)</label>
              <input
                value={tgIds} onChange={(e) => setTgIds(e.target.value)}
                placeholder="9048, 9600"
                className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
              />
            </div>
            <div>
              <label className="text-xs text-gray-400 block mb-1">Discord Webhook URL (optional)</label>
              <input
                value={webhook} onChange={(e) => setWebhook(e.target.value)}
                placeholder="https://discord.com/api/webhooks/…"
                className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
              />
            </div>
          </div>
          {error && <p className="text-red-400 text-xs">{error}</p>}
          <button
            type="submit" disabled={saving}
            className="bg-indigo-600 hover:bg-indigo-500 disabled:opacity-50 text-white text-sm rounded-lg px-4 py-2 transition-colors"
          >
            {saving ? "Creating…" : "Create Rule"}
          </button>
        </form>
      )}

      <div className="bg-gray-900 border border-gray-800 rounded-xl overflow-hidden">
        {rules.length === 0 ? (
          <p className="text-gray-600 text-sm font-mono p-4">No alert rules configured.</p>
        ) : (
          <table className="w-full text-left">
            <thead>
              <tr className="border-b border-gray-800 text-xs text-gray-500 uppercase">
                <th className="px-4 py-3">Name</th>
                <th className="px-4 py-3">Keywords</th>
                <th className="px-4 py-3">Talkgroups</th>
                <th className="px-4 py-3">Webhook</th>
                <th className="px-4 py-3">Enabled</th>
                {isAdmin && <th className="px-4 py-3"></th>}
              </tr>
            </thead>
            <tbody>
              {rules.map((rule) => (
                <tr key={rule.rule_id} className="border-b border-gray-800">
                  <td className="px-4 py-3 text-white text-sm">{rule.name}</td>
                  <td className="px-4 py-3 text-gray-400 text-xs font-mono">{rule.keywords.join(", ") || "—"}</td>
                  <td className="px-4 py-3 text-gray-400 text-xs font-mono">{rule.talkgroup_ids.join(", ") || "—"}</td>
                  <td className="px-4 py-3 text-gray-400 text-xs">
                    {rule.discord_webhook ? (
                      <span className="text-green-400">configured</span>
                    ) : "—"}
                  </td>
                  <td className="px-4 py-3">
                    {isAdmin ? (
                      <button
                        onClick={() => handleToggle(rule)}
                        className={`text-xs px-2 py-0.5 rounded-full transition-colors ${
                          rule.enabled
                            ? "bg-green-900 text-green-300 hover:bg-green-800"
                            : "bg-gray-800 text-gray-400 hover:bg-gray-700"
                        }`}
                      >
                        {rule.enabled ? "enabled" : "disabled"}
                      </button>
                    ) : (
                      <span className={`text-xs ${rule.enabled ? "text-green-400" : "text-gray-500"}`}>
                        {rule.enabled ? "enabled" : "disabled"}
                      </span>
                    )}
                  </td>
                  {isAdmin && (
                    <td className="px-4 py-3">
                      <button
                        onClick={() => handleDelete(rule.rule_id)}
                        className="text-xs text-red-400 hover:text-red-300 transition-colors"
                      >
                        Delete
                      </button>
                    </td>
                  )}
                </tr>
              ))}
            </tbody>
          </table>
        )}
      </div>
    </div>
  );
}

export default function AlertsPage() {
  const { isAdmin } = useAuth();
  const { alerts, loading } = useAlerts();
  const [tab, setTab] = useState<"events" | "rules">("events");

  async function handleAcknowledge(id: string) {
    try {
      await c2api.acknowledgeAlert(id);
    } catch (e) { console.error(e); }
  }

  const unacked = alerts.filter((a) => !a.acknowledged);

  return (
    <div className="p-6 max-w-7xl mx-auto space-y-6">
      <div className="flex items-center gap-4">
        <h1 className="text-white text-xl font-bold font-mono">Alerts</h1>
        {unacked.length > 0 && (
          <span className="text-xs bg-red-900 text-red-300 px-2 py-0.5 rounded-full font-mono">
            {unacked.length} unacknowledged
          </span>
        )}
      </div>

      {/* Tabs */}
      <div className="flex gap-1 bg-gray-900 border border-gray-800 rounded-lg p-1 w-fit">
        {(["events", ...(isAdmin ? ["rules"] : [])] as const).map((t) => (
          <button
            key={t}
            onClick={() => setTab(t as "events" | "rules")}
            className={`text-sm font-mono px-4 py-1.5 rounded-md transition-colors capitalize ${
              tab === t ? "bg-gray-800 text-white" : "text-gray-500 hover:text-gray-300"
            }`}
          >
            {t === "events" ? "Triggered Alerts" : "Rules"}
          </button>
        ))}
      </div>

      {tab === "events" && (
        loading ? (
          <p className="text-gray-500 text-sm font-mono">Loading…</p>
        ) : alerts.length === 0 ? (
          <p className="text-gray-600 text-sm font-mono">No alerts triggered yet.</p>
        ) : (
          <div className="bg-gray-900 border border-gray-800 rounded-xl overflow-hidden">
            <table className="w-full text-left">
              <thead>
                <tr className="border-b border-gray-800 text-xs text-gray-500 uppercase">
                  <th className="px-4 py-3">Rule</th>
                  <th className="px-4 py-3">Talkgroup</th>
                  <th className="px-4 py-3">Matched</th>
                  <th className="px-4 py-3">Snippet</th>
                  <th className="px-4 py-3">Time</th>
                  <th className="px-4 py-3">Status</th>
                </tr>
              </thead>
              <tbody>
                {alerts.map((alert) => (
                  <tr
                    key={alert.alert_id}
                    className={`border-b border-gray-800 ${alert.acknowledged ? "opacity-50" : ""}`}
                  >
                    <td className="px-4 py-3 text-white text-sm">{alert.rule_name}</td>
                    <td className="px-4 py-3 text-gray-400 text-xs font-mono">
                      {alert.talkgroup_name || alert.talkgroup_id || "—"}
                    </td>
                    <td className="px-4 py-3">
                      <div className="flex flex-wrap gap-1">
                        {alert.matched_keywords.map((kw) => (
                          <span key={kw} className="text-xs bg-red-900 text-red-300 px-1.5 py-0.5 rounded">
                            {kw}
                          </span>
                        ))}
                      </div>
                    </td>
                    <td className="px-4 py-3 text-gray-400 text-xs font-mono max-w-xs truncate">
                      {alert.transcript_snippet || "—"}
                    </td>
                    <td className="px-4 py-3 text-gray-400 text-xs font-mono">{fmtTime(alert.triggered_at)}</td>
                    <td className="px-4 py-3">
                      {alert.acknowledged ? (
                        <span className="text-xs text-gray-500">acked</span>
                      ) : (
                        <button
                          onClick={() => handleAcknowledge(alert.alert_id)}
                          className="text-xs bg-gray-800 hover:bg-gray-700 text-gray-300 px-2 py-1 rounded transition-colors"
                        >
                          Acknowledge
                        </button>
                      )}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )
      )}

      {tab === "rules" && <RulesTab isAdmin={isAdmin} />}
    </div>
  );
}
