"use client";
// Making an API token: a name, how long it lasts, and what it may do where (some of the person's own permissions).
import { useActionState, useState } from "react";
import { ErrorText } from "@/components/forms";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { NativeSelect, NativeSelectOption } from "@/components/ui/native-select";
import type { TokenScope } from "@/lib/api";
import { createToken } from "./actions";

const keyOf = (s: TokenScope["scope"]) => (s.type === "hub" ? "hub" : `${s.type}:${s.id}`);
const kindOf = { hub: "Everything", catalog: "Catalog", product: "Product" } as const;

type Row = { scope: string; permissions: string[] };

export function TokenForm({ scopes, maxDays }: { scopes: TokenScope[]; maxDays: number }) {
  const [state, formAction, pending] = useActionState(createToken, null);
  const [rows, setRows] = useState<Row[]>([{ scope: keyOf(scopes[0]!.scope), permissions: [] }]);
  const [copied, setCopied] = useState(false);
  const byKey = new Map(scopes.map((s) => [keyOf(s.scope), s]));
  const grants = rows.flatMap((r) => r.permissions.map((permission) => ({ permission, scope: byKey.get(r.scope)!.scope })));
  const set = (i: number, row: Row) => setRows(rows.map((r, j) => (j === i ? row : r)));
  const unused = scopes.find((s) => !rows.some((r) => r.scope === keyOf(s.scope)));

  return (
    <form action={formAction} className="space-y-4">
      <input type="hidden" name="grants" value={JSON.stringify(grants)} />
      <div className="flex flex-wrap gap-2">
        <Input name="name" required maxLength={64} placeholder="Name, e.g. Upload script" aria-label="Name" className="max-w-xs" />
        <NativeSelect name="days" defaultValue="90" aria-label="Lasts" className="w-36">
          {[7, 30, 90, maxDays].map((d) => (
            <NativeSelectOption key={d} value={d}>
              {d === 365 ? "1 year" : `${d} days`}
            </NativeSelectOption>
          ))}
        </NativeSelect>
      </div>
      {rows.map((row, i) => {
        const scope = byKey.get(row.scope)!;
        return (
          <fieldset key={i} className="space-y-2 rounded-lg border p-3">
            <div className="flex flex-wrap items-center gap-2">
              <NativeSelect
                value={row.scope}
                onChange={(e) => set(i, { scope: e.target.value, permissions: [] })}
                aria-label="Where"
                className="min-w-56"
              >
                {scopes.map((s) => {
                  const k = keyOf(s.scope);
                  if (k !== row.scope && rows.some((r) => r.scope === k)) return null;
                  return (
                    <NativeSelectOption key={k} value={k}>
                      {s.scope.type === "hub" ? "Everything on T5DE" : `${kindOf[s.scope.type]}: ${s.name}`}
                    </NativeSelectOption>
                  );
                })}
              </NativeSelect>
              {rows.length > 1 && (
                <Button type="button" variant="ghost" size="sm" onClick={() => setRows(rows.filter((_, j) => j !== i))}>
                  Remove
                </Button>
              )}
            </div>
            <div className="grid gap-x-4 gap-y-1 sm:grid-cols-2 lg:grid-cols-3">
              {scope.permissions.map((p) => (
                <label key={p} className="flex items-center gap-2 font-mono text-xs">
                  <input
                    type="checkbox"
                    checked={row.permissions.includes(p)}
                    onChange={(e) =>
                      set(i, { ...row, permissions: e.target.checked ? [...row.permissions, p] : row.permissions.filter((x) => x !== p) })
                    }
                  />
                  {p}
                </label>
              ))}
            </div>
          </fieldset>
        );
      })}
      <div className="flex flex-wrap gap-2">
        {unused && (
          <Button type="button" variant="outline" onClick={() => setRows([...rows, { scope: keyOf(unused.scope), permissions: [] }])}>
            Add another place
          </Button>
        )}
        <Button type="submit" disabled={pending || grants.length === 0}>
          {pending ? "Making…" : "Make token"}
        </Button>
      </div>
      {state?.error && <ErrorText>{state.error}</ErrorText>}
      {state?.token && (
        <div role="status" className="space-y-2 rounded-lg border p-3 text-sm">
          <p>
            Your token <strong>{state.name}</strong>. Copy it now: it won&apos;t be shown again.
          </p>
          <div className="flex flex-wrap items-center gap-2">
            <code className="min-w-0 flex-1 rounded bg-muted px-2 py-1 font-mono text-xs break-all">{state.token}</code>
            <Button
              type="button"
              size="sm"
              variant="outline"
              onClick={() => navigator.clipboard.writeText(state.token!).then(() => setCopied(true))}
            >
              {copied ? "Copied" : "Copy"}
            </Button>
          </div>
          <p className="text-muted-foreground">
            Send it as <code className="font-mono text-xs">Authorization: Bearer &lt;token&gt;</code>.
          </p>
        </div>
      )}
    </form>
  );
}