// <LinkForgeAccountForm> — writes an external forge account (base URL +
// token) for one agent into the swarm secret store.
// PUTs `/api/hives/{hive}/agents/{agent}/forge-accounts/{label}` — 200
// (`{ url }`) on success, 400/409/500 as `problem+json`, shown via
// `ApiErrorPanel` like `LinkMatrixAccountForm`.
//
// The label is what the agent passes to `hive-forge -f <label>`. A blind
// set: no route hands a token back. Linked labels and URLs show on
// the agent panel (`LinkedAccounts`).
import { useState } from "preact/hooks";
import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
import { readApiError, type ProblemDetails } from "@hive/shared/api-error.js";
import { Panel } from "../ui/panel/Panel.js";
import { TextField } from "../ui/text-field/TextField.js";
import { Button } from "../ui/button/Button.js";
import "./LinkMatrixAccountForm.css";

// `hive_types::Ident`, which the server checks: `hive-forge -f` accepts
// nothing wider. A UX hint only; the server is the gate.
const LABEL_PATTERN = "[a-z0-9\\-]{1,63}";

type SubmitState =
  | { status: "idle" }
  | { status: "submitting" }
  | { status: "done"; url: string }
  | { status: "error"; problem: ProblemDetails };

export function LinkForgeAccountForm({
  hive,
  agent,
  onClose,
}: {
  hive: string;
  agent: string;
  onClose?: () => void;
}) {
  const [label, setLabel] = useState("");
  const [url, setUrl] = useState("");
  const [token, setToken] = useState("");
  const [result, setResult] = useState<SubmitState>({ status: "idle" });

  async function submit(e: Event) {
    e.preventDefault();
    setResult({ status: "submitting" });
    try {
      const r = await fetch(
        `/api/hives/${encodeURIComponent(hive)}/agents/${encodeURIComponent(agent)}/forge-accounts/${encodeURIComponent(label)}`,
        {
          method: "PUT",
          headers: { "content-type": "application/json" },
          body: JSON.stringify({ url: url.trim(), token }),
        },
      );
      if (!r.ok) {
        setResult({ status: "error", problem: await readApiError(r) });
        return;
      }
      const body = (await r.json().catch(() => ({}))) as { url?: string };
      setResult({ status: "done", url: body.url ?? url.trim() });
      // The store holds the token now; nothing here needs it.
      setToken("");
    } catch (err) {
      setResult({ status: "error", problem: { detail: String(err) } });
    }
  }

  return (
    <Panel
      title={`link a forge account — ${agent}`}
      icon="🔗"
      onClose={onClose}
    >
      <p>
        Writes the account to the swarm secret store. The agent fetches it
        within two minutes and can then use{" "}
        <code>hive-forge -f {label || "<label>"}</code>. Create the token on the
        external forge first; nothing is created there.
      </p>
      <form class="link-matrix-account-form" onSubmit={submit}>
        <TextField
          id="forge-account-label"
          label="label"
          value={label}
          pattern={LABEL_PATTERN}
          title="1-63 chars: lowercase letters, digits, hyphen"
          placeholder="e.g. myforge"
          required
          onInput={setLabel}
        />
        <TextField
          id="forge-account-url"
          label="forge URL"
          type="url"
          value={url}
          placeholder="https://forge.example.org"
          required
          onInput={setUrl}
        />
        <TextField
          id="forge-account-token"
          label="access token"
          type="password"
          value={token}
          required
          onInput={setToken}
        />
        <Button
          variant="primary"
          type="submit"
          disabled={result.status === "submitting"}
        >
          {result.status === "submitting" ? "linking…" : "link account"}
        </Button>
      </form>
      {result.status === "done" && (
        <p class="link-matrix-account-result-ok">
          linked <strong>{label}</strong> ({result.url}) to{" "}
          <strong>{agent}</strong>
        </p>
      )}
      {result.status === "error" && (
        <ApiErrorPanel
          context="failed to link the account"
          problem={result.problem}
        />
      )}
    </Panel>
  );
}