import fs from "node:fs";
import type { CallTemplateFunctionArgs, Context, PluginDefinition } from "@yaakapp/api";

const UTF8 = "utf8";
const options = [
  { label: "ASCII", value: "ascii" },
  { label: "UTF-8", value: UTF8 },
  { label: "UTF-16 LE", value: "utf16le" },
  { label: "Base64", value: "base64" },
  { label: "Base64 URL-safe", value: "base64url" },
  { label: "Latin-1", value: "latin1" },
  { label: "Hexadecimal", value: "hex" },
];
export const plugin: PluginDefinition = {
  templateFunctions: [
    {
      name: "fs.readFile",
      description: "Read the contents of a file as utf-8",
      previewArgs: ["encoding"],
      args: [
        { title: "Select File", type: "file", name: "path", label: "File" },
        {
          type: "select",
          name: "encoding",
          label: "Encoding",
          defaultValue: UTF8,
          description: "Specifies how the file's bytes are decoded into text when read",
          options,
        },
        {
          type: "checkbox",
          name: "trim",
          label: "Trim Whitespace",
          description: "Remove leading and trailing whitespace from the file contents",
        },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        if (!args.values.path || !args.values.encoding) return null;

        try {
          const v = await fs.promises.readFile(String(args.values.path ?? ""), {
            encoding: String(args.values.encoding ?? "utf-8") as BufferEncoding,
          });
          return args.values.trim ? v.trim() : v;
        } catch {
          return null;
        }
      },
    },
  ],
};