import { useEffect, useState, type ReactNode } from 'react';
import {
  api,
  BlobSummary,
  TagSummary,
  RefSummary,
  SnapshotSummary,
  fmtBytes,
  fmtAge,
} from '../lib/api';

type Tab = 'blobs' | 'tags' | 'refs' | 'snapshots';

interface Props {
  tab: Tab;
}

export function StorageBrowser({ tab }: Props) {
  return (
    <div className="space-y-4">
      <h1 className="text-2xl font-semibold text-slate-100">Storage · {tab}</h1>
      {tab === 'blobs' && <BlobsList />}
      {tab === 'tags' && <TagsList />}
      {tab === 'refs' && <RefsList />}
      {tab === 'snapshots' && <SnapshotsList />}
    </div>
  );
}

function BlobsList() {
  const [rows, setRows] = useState<BlobSummary[]>([]);
  const [err, setErr] = useState<string | null>(null);
  useEffect(() => {
    api.blobs().then(setRows).catch((e) => setErr(String(e)));
  }, []);
  return (
    <>
      {err && <ErrorBox msg={err} />}
      <Table
        headers={['node', 'blob-id', 'size', 'chunks']}
        rows={rows.map((r) => [
          <NodePill key="n" node={r.node} />,
          <span key="hex" className="font-mono text-xs">
            {r.blob_id_hex.slice(0, 24)}…
          </span>,
          fmtBytes(r.size_bytes),
          r.chunk_count.toString(),
        ])}
      />
      <Footer count={rows.length} />
    </>
  );
}

function TagsList() {
  const [rows, setRows] = useState<TagSummary[]>([]);
  const [prefix, setPrefix] = useState('');
  const [err, setErr] = useState<string | null>(null);
  useEffect(() => {
    api.tags(prefix).then(setRows).catch((e) => setErr(String(e)));
  }, [prefix]);
  return (
    <>
      <input
        value={prefix}
        onChange={(e) => setPrefix(e.target.value)}
        placeholder="filter prefix — e.g. clawverse:"
        className="w-full sm:w-96 rounded bg-slate-900 border border-slate-800 px-3 py-2 text-sm font-mono"
      />
      {err && <ErrorBox msg={err} />}
      <Table
        headers={['node', 'key', 'blob-id']}
        rows={rows.map((r) => [
          <NodePill key="n" node={r.node} />,
          <span key="k" className="font-mono text-sm">
            {r.key}
          </span>,
          <span key="v" className="font-mono text-xs text-slate-400">
            {r.value_hex.slice(0, 24)}…
          </span>,
        ])}
      />
      <Footer count={rows.length} />
    </>
  );
}

function RefsList() {
  const [rows, setRows] = useState<RefSummary[]>([]);
  const [err, setErr] = useState<string | null>(null);
  useEffect(() => {
    api.refs().then(setRows).catch((e) => setErr(String(e)));
  }, []);
  return (
    <>
      {err && <ErrorBox msg={err} />}
      <Table
        headers={['node', 'fingerprint', 'blob-id']}
        rows={rows.map((r) => [
          <NodePill key="n" node={r.node} />,
          <span key="fp" className="font-mono text-xs">
            {r.fingerprint_hex.slice(0, 24)}…
          </span>,
          <span key="b" className="font-mono text-xs text-slate-400">
            {r.blob_id_hex.slice(0, 24)}…
          </span>,
        ])}
      />
      <Footer count={rows.length} />
    </>
  );
}

function SnapshotsList() {
  const [rows, setRows] = useState<SnapshotSummary[]>([]);
  const [err, setErr] = useState<string | null>(null);
  useEffect(() => {
    api.snapshots().then(setRows).catch((e) => setErr(String(e)));
  }, []);
  return (
    <>
      {err && <ErrorBox msg={err} />}
      <Table
        headers={['node', 'name', 'created', 'blobs', 'json size']}
        rows={rows.map((r) => [
          <NodePill key="node" node={r.node} />,
          <span key="n" className="font-mono text-sm">
            {r.name}
          </span>,
          fmtAge(r.created_at_unix),
          r.blob_count.toString(),
          fmtBytes(r.file_bytes),
        ])}
      />
      <Footer count={rows.length} />
    </>
  );
}

function Table({
  headers,
  rows,
}: {
  headers: string[];
  rows: ReactNode[][];
}) {
  return (
    <div className="rounded border border-slate-800 overflow-hidden">
      <table className="w-full text-sm">
        <thead className="bg-slate-900/60 text-slate-500 uppercase text-xs tracking-wider">
          <tr>
            {headers.map((h) => (
              <th key={h} className="text-left px-4 py-2 font-normal">
                {h}
              </th>
            ))}
          </tr>
        </thead>
        <tbody>
          {rows.length === 0 && (
            <tr>
              <td className="px-4 py-6 text-center text-slate-500" colSpan={headers.length}>
                nothing here yet
              </td>
            </tr>
          )}
          {rows.map((row, i) => (
            <tr key={i} className="border-t border-slate-900 hover:bg-slate-900/40">
              {row.map((cell, j) => (
                <td key={j} className="px-4 py-2">
                  {cell}
                </td>
              ))}
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}

function Footer({ count }: { count: number }) {
  return (
    <div className="text-xs text-slate-500 mt-2 font-mono">
      {count} row{count === 1 ? '' : 's'}
    </div>
  );
}

function ErrorBox({ msg }: { msg: string }) {
  return (
    <div className="rounded border border-red-800 bg-red-950/40 p-3 text-red-300 text-sm mb-2">
      {msg}
    </div>
  );
}

/// Small pill badge for the originating node — clickable to
/// drill into that node's detail page.
function NodePill({ node }: { node: string }) {
  return (
    <a
      href={`#/nodes/${node}`}
      className="inline-block rounded bg-slate-800 text-emerald-300 text-xs font-mono px-2 py-0.5 hover:bg-slate-700"
    >
      {node}
    </a>
  );
}