import type { PluginDefinition } from "@yaakapp/api";
import jwt from "jsonwebtoken";

const algorithms = [
  "HS256",
  "HS384",
  "HS512",
  "RS256",
  "RS384",
  "RS512",
  "PS256",
  "PS384",
  "PS512",
  "ES256",
  "ES384",
  "ES512",
  "none",
] as const;

const defaultAlgorithm = algorithms[0];

export const plugin: PluginDefinition = {
  authentication: {
    name: "jwt",
    label: "JWT Bearer",
    shortLabel: "JWT",
    args: [
      {
        type: "select",
        name: "algorithm",
        label: "Algorithm",
        hideLabel: true,
        defaultValue: defaultAlgorithm,
        options: algorithms.map((value) => ({ label: value === "none" ? "None" : value, value })),
      },
      {
        type: "text",
        name: "secret",
        label: "Secret or Private Key",
        password: true,
        optional: true,
        multiLine: true,
      },
      {
        type: "checkbox",
        name: "secretBase64",
        label: "Secret is base64 encoded",
      },
      {
        type: "editor",
        name: "payload",
        label: "JWT Payload",
        language: "json",
        defaultValue: '{\n  "foo": "bar"\n}',
        placeholder: "{ }",
      },
      {
        type: "accordion",
        label: "Advanced",
        inputs: [
          {
            type: "editor",
            name: "headers",
            label: "JWT Header",
            description: "Merged with auto-generated header fields like alg (e.g., kid)",
            language: "json",
            defaultValue: "{}",
            placeholder: "{ }",
            optional: true,
          },
          {
            type: "select",
            name: "location",
            label: "Behavior",
            defaultValue: "header",
            options: [
              { label: "Insert Header", value: "header" },
              { label: "Append Query Parameter", value: "query" },
            ],
          },
          {
            type: "h_stack",
            inputs: [
              {
                type: "text",
                name: "name",
                label: "Header Name",
                defaultValue: "Authorization",
                optional: true,
                description: "The name of the header to add to the request",
              },
              {
                type: "text",
                name: "headerPrefix",
                label: "Header Prefix",
                optional: true,
                defaultValue: "Bearer",
              },
            ],
            dynamic(_ctx, args) {
              if (args.values.location === "query") {
                return {
                  hidden: true,
                };
              }
            },
          },
          {
            type: "text",
            name: "name",
            label: "Parameter Name",
            description: "The name of the query parameter to add to the request",
            defaultValue: "token",
            optional: true,
            dynamic(_ctx, args) {
              if (args.values.location !== "query") {
                return {
                  hidden: true,
                };
              }
            },
          },
        ],
      },
    ],
    async onApply(_ctx, { values }) {
      const { algorithm, secret: _secret, secretBase64, payload, headers } = values;
      const secret = secretBase64 ? Buffer.from(`${_secret}`, "base64") : `${_secret}`;

      const parsedHeaders = headers ? JSON.parse(`${headers}`) : undefined;

      const token = jwt.sign(`${payload}`, secret, {
        algorithm: algorithm as (typeof algorithms)[number],
        // Extra header fields are merged with the auto-generated header (which includes alg)
        header: parsedHeaders as jwt.JwtHeader | undefined,
      });

      if (values.location === "query") {
        const paramName = String(values.name || "token");
        return { setQueryParameters: [{ name: paramName, value: token }] };
      }
      const headerPrefix = values.headerPrefix != null ? values.headerPrefix : "Bearer";
      const headerName = String(values.name || "Authorization");
      const headerValue = `${headerPrefix} ${token}`.trim();
      return { setHeaders: [{ name: headerName, value: headerValue }] };
    },
  },
};