"use client";

import { FormEvent, useCallback, useEffect, useState } from "react";
import { Nav, useAuth } from "@/components/Nav";

type Device = {
  id: string;
  name: string;
  platform: string;
  lastSeenAt: string | null;
  createdAt: string;
};

type GooglePlaySyncStatus =
  | "NOT_ENABLED"
  | "PENDING_ADD"
  | "ACTIVE"
  | "PENDING_REMOVE"
  | "REMOVED"
  | "ERROR";

type Viewer = {
  id: string;
  email: string;
  name: string | null;
  enabled: boolean;
  appAccess: boolean;
  googlePlayEmail: string | null;
  googlePlayAccess: boolean;
  googlePlayMembershipId: string | null;
  googlePlaySyncStatus: GooglePlaySyncStatus;
  googlePlayLastSyncedAt: string | null;
  googlePlaySyncError: string | null;
  googlePlayResolvedEmail: string;
  createdAt: string;
  deviceCount: number;
  devices: Device[];
};

type PlayConfig = {
  configured: boolean;
  groupEmail: string | null;
  groupId: string | null;
  optInUrl: string | null;
};

const SYNC_LABELS: Record<GooglePlaySyncStatus, string> = {
  NOT_ENABLED: "Niet ingeschakeld",
  PENDING_ADD: "Bezig met toevoegen…",
  ACTIVE: "Actief",
  PENDING_REMOVE: "Bezig met verwijderen…",
  REMOVED: "Verwijderd",
  ERROR: "Fout",
};

export default function ViewersPage() {
  useAuth();
  const [viewers, setViewers] = useState<Viewer[]>([]);
  const [playConfig, setPlayConfig] = useState<PlayConfig | null>(null);
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [name, setName] = useState("");
  const [busy, setBusy] = useState(false);
  const [msg, setMsg] = useState<string | null>(null);
  const [err, setErr] = useState<string | null>(null);
  const [playEmails, setPlayEmails] = useState<Record<string, string>>({});

  const load = useCallback(() => {
    fetch("/api/v1/admin/viewers", { credentials: "include" })
      .then((r) => r.json())
      .then((d) => {
        const list: Viewer[] = d.viewers ?? [];
        setViewers(list);
        setPlayEmails((prev) => {
          const next = { ...prev };
          for (const v of list) {
            if (next[v.id] === undefined) {
              next[v.id] = v.googlePlayEmail ?? "";
            }
          }
          return next;
        });
      })
      .catch(() => setErr("Kon kijkers niet laden"));
  }, []);

  useEffect(() => {
    load();
    fetch("/api/v1/admin/google-play-access/config", { credentials: "include" })
      .then((r) => r.json())
      .then((d) => setPlayConfig(d.config ?? null))
      .catch(() => undefined);
  }, [load]);

  async function createViewer(e: FormEvent) {
    e.preventDefault();
    setBusy(true);
    setMsg(null);
    setErr(null);
    try {
      const res = await fetch("/api/v1/admin/viewers", {
        method: "POST",
        credentials: "include",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password, name: name || undefined, appAccess: true }),
      });
      const data = await res.json().catch(() => ({}));
      if (!res.ok) {
        setErr(data.error?.message ?? "Aanmaken mislukt");
        return;
      }
      setMsg(`Kijker ${data.viewer.email} aangemaakt`);
      setEmail("");
      setPassword("");
      setName("");
      load();
    } finally {
      setBusy(false);
    }
  }

  async function toggle(v: Viewer, field: "enabled" | "appAccess") {
    await fetch(`/api/v1/admin/viewers/${v.id}`, {
      method: "PATCH",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ [field]: !v[field] }),
    });
    load();
  }

  async function setPlayAccess(v: Viewer, enabled: boolean) {
    setMsg(null);
    setErr(null);
    const res = await fetch(`/api/v1/admin/viewers/${v.id}/google-play-access`, {
      method: "PATCH",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        enabled,
        email: playEmails[v.id]?.trim() || null,
      }),
    });
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      setErr(data.error?.message ?? "Google Play-toegang bijwerken mislukt");
    } else {
      setMsg(data.message ?? (enabled ? "Google Play access enabled." : "Google Play access removed."));
      if (data.syncError) setErr(data.syncError);
    }
    load();
  }

  async function retryPlaySync(v: Viewer) {
    setMsg(null);
    setErr(null);
    const res = await fetch(`/api/v1/admin/viewers/${v.id}/google-play-access/retry`, {
      method: "POST",
      credentials: "include",
    });
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      setErr(data.error?.message ?? "Synchronisatie mislukt");
    } else {
      setMsg(data.message ?? "Synchronization completed.");
      if (data.syncError) setErr(data.syncError);
    }
    load();
  }

  async function bulkAction(path: "sync-all" | "reconcile") {
    setMsg(null);
    setErr(null);
    const res = await fetch(`/api/v1/admin/google-play-access/${path}`, {
      method: "POST",
      credentials: "include",
    });
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      setErr(data.error?.message ?? "Actie mislukt");
      return;
    }
    const s = data.summary;
    setMsg(
      `Scanned: ${s.scanned} · Correct: ${s.correct} · Added: ${s.added} · Removed: ${s.removed} · Errors: ${s.errors}`
    );
    load();
  }

  async function revokeDevice(deviceId: string) {
    if (!confirm("Apparaat intrekken?")) return;
    await fetch(`/api/v1/admin/viewers/devices/${deviceId}/revoke`, {
      method: "POST",
      credentials: "include",
    });
    load();
  }

  return (
    <>
      <Nav />
      <main className="page">
        <header className="page-header">
          <div>
            <p className="page-kicker">Mensen</p>
            <h1>Kijkers</h1>
            <p className="muted">
              Accounts voor de Android TV / phone-app. Gebruikers koppelen zelf via{" "}
              <a href="/link">/link</a> met een code.
            </p>
          </div>
        </header>

        {playConfig && (
          <section className="card-block play-banner">
            <h2>Google Play access</h2>
            <p className="muted">
              {playConfig.configured
                ? `Groep: ${playConfig.groupEmail ?? playConfig.groupId}`
                : "Google Play-toegang is nog niet geconfigureerd op de server (zie GOOGLE_PLAY_ACCESS_SETUP.md)."}
            </p>
            {playConfig.configured && (
              <div className="viewer-actions">
                <button type="button" onClick={() => bulkAction("sync-all")}>
                  Sync all
                </button>
                <button type="button" onClick={() => bulkAction("reconcile")}>
                  Reconcile
                </button>
              </div>
            )}
          </section>
        )}

        <section className="card-block">
          <h2>Nieuwe kijker</h2>
          <form className="form-grid" onSubmit={createViewer}>
            <label>
              Naam
              <input value={name} onChange={(e) => setName(e.target.value)} placeholder="Jos" />
            </label>
            <label>
              E-mail
              <input
                type="email"
                required
                value={email}
                onChange={(e) => setEmail(e.target.value)}
              />
            </label>
            <label>
              Wachtwoord
              <input
                type="password"
                required
                minLength={8}
                value={password}
                onChange={(e) => setPassword(e.target.value)}
              />
            </label>
            <button type="submit" className="btn-primary" disabled={busy}>
              Aanmaken
            </button>
          </form>
          {msg && <p className="form-ok">{msg}</p>}
          {err && <p className="form-error">{err}</p>}
        </section>

        <section className="card-block">
          <h2>Overzicht</h2>
          {viewers.length === 0 ? (
            <p className="muted">Nog geen kijkers.</p>
          ) : (
            <div className="viewer-list">
              {viewers.map((v) => (
                <article key={v.id} className="viewer-row">
                  <div>
                    <strong>{v.name || v.email}</strong>
                    <div className="muted">Account email: {v.email}</div>
                    <div className="muted">
                      {v.enabled ? "Actief" : "Uit"} · app {v.appAccess ? "aan" : "uit"} ·{" "}
                      {v.deviceCount} apparaat(en)
                    </div>
                  </div>
                  <div className="viewer-actions">
                    <button type="button" onClick={() => toggle(v, "enabled")}>
                      {v.enabled ? "Uitschakelen" : "Activeren"}
                    </button>
                    <button type="button" onClick={() => toggle(v, "appAccess")}>
                      {v.appAccess ? "App uit" : "App aan"}
                    </button>
                  </div>

                  <div className="play-section">
                    <h3>Google Play access</h3>
                    <label className="play-field">
                      Google Play email
                      <input
                        type="email"
                        placeholder={v.email}
                        value={playEmails[v.id] ?? ""}
                        onChange={(e) =>
                          setPlayEmails((prev) => ({ ...prev, [v.id]: e.target.value }))
                        }
                      />
                      <span className="muted">
                        Fallback: {v.googlePlayResolvedEmail || v.email}
                      </span>
                    </label>
                    <div className="play-meta">
                      <span>
                        Store access:{" "}
                        <strong>{v.googlePlayAccess ? "ON" : "OFF"}</strong>
                      </span>
                      <span>
                        Status:{" "}
                        <strong className={v.googlePlaySyncStatus === "ERROR" ? "status-err" : ""}>
                          {SYNC_LABELS[v.googlePlaySyncStatus] ?? v.googlePlaySyncStatus}
                        </strong>
                      </span>
                      {v.googlePlayLastSyncedAt && (
                        <span className="muted">
                          Last synchronized:{" "}
                          {new Date(v.googlePlayLastSyncedAt).toLocaleString("nl-NL")}
                        </span>
                      )}
                      {v.googlePlaySyncError && (
                        <span className="form-error">{v.googlePlaySyncError}</span>
                      )}
                    </div>
                    <div className="viewer-actions">
                      {!v.googlePlayAccess ? (
                        <button type="button" onClick={() => setPlayAccess(v, true)}>
                          Store access aan
                        </button>
                      ) : (
                        <button type="button" onClick={() => setPlayAccess(v, false)}>
                          Store access uit
                        </button>
                      )}
                      {v.googlePlaySyncStatus === "ERROR" && (
                        <button type="button" onClick={() => retryPlaySync(v)}>
                          Retry synchronization
                        </button>
                      )}
                      {v.googlePlayAccess &&
                        v.googlePlaySyncStatus === "ACTIVE" &&
                        playConfig?.optInUrl && (
                          <a
                            href={playConfig.optInUrl}
                            target="_blank"
                            rel="noopener noreferrer"
                            className="btn-link"
                          >
                            Open Google Play
                          </a>
                        )}
                    </div>
                  </div>

                  {v.devices.length > 0 && (
                    <ul className="device-list">
                      {v.devices.map((d) => (
                        <li key={d.id}>
                          <span>
                            {d.name} <span className="muted">({d.platform})</span>
                          </span>
                          <button type="button" onClick={() => revokeDevice(d.id)}>
                            Intrekken
                          </button>
                        </li>
                      ))}
                    </ul>
                  )}
                </article>
              ))}
            </div>
          )}
        </section>
      </main>
      <style jsx>{`
        .viewer-list {
          display: grid;
          gap: 1rem;
        }
        .viewer-row {
          border: 1px solid rgba(255, 255, 255, 0.08);
          border-radius: 12px;
          padding: 1rem;
          display: grid;
          gap: 0.75rem;
        }
        .viewer-actions {
          display: flex;
          flex-wrap: wrap;
          gap: 0.5rem;
          align-items: center;
        }
        .play-section {
          border-top: 1px solid rgba(255, 255, 255, 0.06);
          padding-top: 0.75rem;
          display: grid;
          gap: 0.5rem;
        }
        .play-section h3 {
          margin: 0;
          font-size: 0.95rem;
        }
        .play-field {
          display: grid;
          gap: 0.25rem;
          max-width: 360px;
        }
        .play-field input {
          width: 100%;
        }
        .play-meta {
          display: grid;
          gap: 0.25rem;
          font-size: 0.9rem;
        }
        .play-banner .viewer-actions {
          margin-top: 0.5rem;
        }
        .status-err {
          color: #ff8b8b;
        }
        .btn-link {
          color: #8ec5ff;
          text-decoration: underline;
          font-size: 0.9rem;
        }
        .device-list {
          list-style: none;
          margin: 0;
          padding: 0;
          display: grid;
          gap: 0.4rem;
        }
        .device-list li {
          display: flex;
          justify-content: space-between;
          gap: 1rem;
          align-items: center;
          font-size: 0.9rem;
        }
        .form-ok {
          color: #8dffb0;
        }
        .form-error {
          color: #ff8b8b;
        }
      `}</style>
    </>
  );
}