import type { XPathResult } from "@yaak/template-function-xml";
import type { CallTemplateFunctionArgs, Context, PluginDefinition } from "@yaakapp/api";
import { JSONPath } from "jsonpath-plus";

const RETURN_FIRST = "first";
const RETURN_ALL = "all";
const RETURN_JOIN = "join";

export const plugin: PluginDefinition = {
  templateFunctions: [
    {
      name: "json.jsonpath",
      description: "Filter JSON-formatted text using JSONPath syntax",
      previewArgs: ["query"],
      args: [
        {
          type: "editor",
          name: "input",
          label: "Input",
          language: "json",
          placeholder: '{ "foo": "bar" }',
        },
        {
          type: "h_stack",
          inputs: [
            {
              type: "select",
              name: "result",
              label: "Return Format",
              defaultValue: RETURN_FIRST,
              options: [
                { label: "First result", value: RETURN_FIRST },
                { label: "All results", value: RETURN_ALL },
                { label: "Join with separator", value: RETURN_JOIN },
              ],
            },
            {
              name: "join",
              type: "text",
              label: "Separator",
              optional: true,
              defaultValue: ", ",
              dynamic(_ctx, args) {
                return { hidden: args.values.result !== RETURN_JOIN };
              },
            },
          ],
        },
        {
          type: "checkbox",
          name: "formatted",
          label: "Pretty Print",
          description: "Format the output as JSON",
          dynamic(_ctx, args) {
            return { hidden: args.values.result === RETURN_JOIN };
          },
        },
        { type: "text", name: "query", label: "Query", placeholder: "$..foo" },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        try {
          return filterJSONPath(
            String(args.values.input),
            String(args.values.query),
            (args.values.result || RETURN_FIRST) as XPathResult,
            args.values.join == null ? null : String(args.values.join),
            Boolean(args.values.formatted),
          );
        } catch {
          return null;
        }
      },
    },
    {
      name: "json.escape",
      description: "Escape a JSON string, useful when using the output in JSON values",
      args: [
        {
          type: "text",
          name: "input",
          label: "Input",
          multiLine: true,
          placeholder: 'Hello "World"',
        },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        const input = String(args.values.input ?? "");
        return input.replace(/\\/g, "\\\\").replace(/"/g, '\\"');
      },
    },
    {
      name: "json.minify",
      description: "Remove unnecessary whitespace from a valid JSON string.",
      args: [
        {
          type: "editor",
          language: "json",
          name: "input",
          label: "Input",
          placeholder: '{ "foo": "bar" }',
        },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        const input = String(args.values.input ?? "");
        try {
          return JSON.stringify(JSON.parse(input));
        } catch {
          return input;
        }
      },
    },
  ],
};

export type JSONPathResult = "first" | "join" | "all";

export function filterJSONPath(
  body: string,
  path: string,
  result: JSONPathResult,
  join: string | null,
  formatted = false,
): string {
  const parsed = JSON.parse(body);
  let items = JSONPath({ path, json: parsed });

  if (items == null) {
    return "";
  }

  if (!Array.isArray(items)) {
    // Already good
  } else if (result === "first") {
    items = items[0] ?? "";
  } else if (result === "join") {
    items = items.map((i) => objToStr(i, false)).join(join ?? "");
  }

  return objToStr(items, formatted);
}

function objToStr(o: unknown, formatted = false): string {
  if (
    Object.prototype.toString.call(o) === "[object Array]" ||
    Object.prototype.toString.call(o) === "[object Object]"
  ) {
    return formatted ? JSON.stringify(o, null, 2) : JSON.stringify(o);
  }
  return String(o);
}