"use client";

import { useEffect, useState } from "react";
import { AppShell } from "@/components/app-shell";
import { apiFetch } from "@/lib/api";

type ApiKey = {
  id: string;
  name: string;
  prefix: string;
  scopes: string[];
  lastUsedAt: string | null;
  revokedAt: string | null;
  expiresAt: string | null;
  createdAt: string;
};

type KeyListResponse = { keys: ApiKey[] };
type CreatedKey = ApiKey & { key: string };

const apiExample = `curl -H "Authorization: Bearer l1_your_api_key" \\
  "https://api.aarthalabs.com/api/public/v1/transactions?limit=25"`;

const sdkExample = `async function ledgerOne(path, apiKey) {
  const res = await fetch(\`https://api.aarthalabs.com/api/public/v1\${path}\`, {
    headers: { Authorization: \`Bearer \${apiKey}\` },
  });
  if (!res.ok) throw new Error(await res.text());
  return res.json();
}

const transactions = await ledgerOne("/transactions?limit=25", process.env.LEDGERONE_API_KEY);`;

export default function DeveloperPage() {
  const [keys, setKeys] = useState<ApiKey[]>([]);
  const [name, setName] = useState("Automation key");
  const [createdKey, setCreatedKey] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);
  const [message, setMessage] = useState<string | null>(null);

  const loadKeys = async () => {
    setLoading(true);
    const res = await apiFetch<KeyListResponse>("/api/api-keys");
    if (res.error) {
      setMessage(res.error.message);
    } else {
      setKeys(res.data.keys);
      setMessage(null);
    }
    setLoading(false);
  };

  useEffect(() => {
    void loadKeys();
  }, []);

  const createKey = async () => {
    const res = await apiFetch<CreatedKey>("/api/api-keys", {
      method: "POST",
      body: JSON.stringify({ name, scopes: ["transactions:read"] }),
    });
    if (res.error) {
      setMessage(res.error.message);
      return;
    }
    setCreatedKey(res.data.key);
    setName("Automation key");
    await loadKeys();
  };

  const revokeKey = async (id: string) => {
    const res = await apiFetch<{ revoked: boolean }>(`/api/api-keys/${id}`, { method: "DELETE" });
    if (res.error) {
      setMessage(res.error.message);
      return;
    }
    await loadKeys();
  };

  return (
    <AppShell title="Developer" subtitle="API keys, public endpoint docs, and integration examples.">
      <div className="mx-auto flex w-full max-w-6xl flex-col gap-6">
        {message ? (
          <div className="rounded-md border border-amber-200 bg-amber-50 px-4 py-3 text-sm text-amber-900">{message}</div>
        ) : null}

        {createdKey ? (
          <section className="rounded-lg border border-emerald-200 bg-emerald-50 p-4">
            <h2 className="text-sm font-semibold text-emerald-950">New API key</h2>
            <p className="mt-1 text-xs text-emerald-800">This secret is shown once. Store it in your password manager or server environment.</p>
            <pre className="mt-3 overflow-x-auto rounded-md bg-white p-3 text-xs text-slate-900">{createdKey}</pre>
          </section>
        ) : null}

        <section className="grid gap-4 lg:grid-cols-[1fr_1.2fr]">
          <div className="rounded-lg border border-slate-200 bg-white p-4">
            <h2 className="text-base font-semibold text-slate-950">Create Key</h2>
            <label className="mt-4 block text-sm font-medium text-slate-700">Key name</label>
            <input
              value={name}
              onChange={(event) => setName(event.target.value)}
              className="mt-2 w-full rounded-md border border-slate-300 px-3 py-2 text-sm"
            />
            <button
              onClick={createKey}
              className="mt-4 rounded-md bg-slate-950 px-4 py-2 text-sm font-medium text-white hover:bg-slate-800"
            >
              Create API key
            </button>
          </div>

          <div className="rounded-lg border border-slate-200 bg-white p-4">
            <h2 className="text-base font-semibold text-slate-950">Read Endpoints</h2>
            <div className="mt-3 grid gap-2 text-sm text-slate-700 sm:grid-cols-2">
              <span>/public/v1/transactions</span>
              <span>/public/v1/transactions/summary</span>
              <span>/public/v1/transactions/cashflow</span>
              <span>/public/v1/transactions/merchants</span>
            </div>
            <pre className="mt-4 overflow-x-auto rounded-md bg-slate-950 p-3 text-xs text-slate-50">{apiExample}</pre>
          </div>
        </section>

        <section className="rounded-lg border border-slate-200 bg-white p-4">
          <div className="flex items-center justify-between gap-3">
            <h2 className="text-base font-semibold text-slate-950">API Keys</h2>
            <button onClick={loadKeys} className="rounded-md border border-slate-300 px-3 py-2 text-sm text-slate-700">
              Refresh
            </button>
          </div>
          <div className="mt-4 overflow-x-auto">
            <table className="w-full min-w-[680px] text-left text-sm">
              <thead className="border-b border-slate-200 text-xs uppercase text-slate-500">
                <tr>
                  <th className="py-2">Name</th>
                  <th className="py-2">Prefix</th>
                  <th className="py-2">Scopes</th>
                  <th className="py-2">Last used</th>
                  <th className="py-2">Status</th>
                  <th className="py-2 text-right">Action</th>
                </tr>
              </thead>
              <tbody>
                {loading ? (
                  <tr><td className="py-4 text-slate-500" colSpan={6}>Loading keys...</td></tr>
                ) : keys.length ? (
                  keys.map((key) => (
                    <tr key={key.id} className="border-b border-slate-100">
                      <td className="py-3 font-medium text-slate-900">{key.name}</td>
                      <td className="py-3 text-slate-600">{key.prefix}</td>
                      <td className="py-3 text-slate-600">{key.scopes.join(", ")}</td>
                      <td className="py-3 text-slate-600">{key.lastUsedAt ? new Date(key.lastUsedAt).toLocaleString() : "Never"}</td>
                      <td className="py-3 text-slate-600">{key.revokedAt ? "Revoked" : "Active"}</td>
                      <td className="py-3 text-right">
                        {!key.revokedAt ? (
                          <button onClick={() => revokeKey(key.id)} className="rounded-md border border-red-200 px-3 py-1.5 text-xs font-medium text-red-700">
                            Revoke
                          </button>
                        ) : null}
                      </td>
                    </tr>
                  ))
                ) : (
                  <tr><td className="py-4 text-slate-500" colSpan={6}>No API keys yet.</td></tr>
                )}
              </tbody>
            </table>
          </div>
        </section>

        <section className="rounded-lg border border-slate-200 bg-white p-4">
          <h2 className="text-base font-semibold text-slate-950">Minimal JavaScript Client</h2>
          <pre className="mt-3 overflow-x-auto rounded-md bg-slate-950 p-3 text-xs text-slate-50">{sdkExample}</pre>
        </section>
      </div>
    </AppShell>
  );
}
