import { join } from "node:path";
import levenshtein from "fast-levenshtein";
import { respond } from "../audio/AudioService.js";

const isStringInt = (s: string): boolean => /^-?\d+$/.test(s);

import type { BotStateRow, WBWStoryRow } from "../db/schema.js";
import type { Module } from "./types.js";

export const wordbyword: Module = ({ audio, commands, db, t, rootDir }) => {
  const sysmsg = join(rootDir, "sysmsg.wav");
  let currentWBW = "";

  commands.register("wbw", async (args, message) => {
    if (args.length === 1) {
      return respond(
        audio,
        sysmsg,
        message,
        currentWBW ? t("CURRENT_STORY", currentWBW) : t("NO_STORY"),
      );
    }
    if (args.length > 2) {
      return respond(audio, sysmsg, message, t("TOO_MANY_ARGUMENTS"));
    }
    const arg1 = args[1];
    if (arg1 === undefined) return;

    if (isStringInt(arg1)) {
      const story = await db.get<WBWStoryRow>(
        "select * from WBWStories where story_id=?",
        parseInt(arg1, 10),
      );
      if (!story) return respond(audio, sysmsg, message, t("WBW_INVALID_ID"));
      return respond(audio, sysmsg, message, story.story_text);
    }

    const lastUser = await db.get<BotStateRow>(
      "select value from BotState where key='last_wbw'",
    );
    if (lastUser && message.author.id === lastUser.value && currentWBW !== "") {
      const lastWord =
        currentWBW.indexOf(" ") === currentWBW.lastIndexOf(" ")
          ? currentWBW.trim()
          : currentWBW.slice(currentWBW.slice(0, -1).lastIndexOf(" ") + 1).trim();
      if (levenshtein.get(arg1, lastWord) <= 3) {
        currentWBW = currentWBW.replace(
          new RegExp(`${escapeRegExp(lastWord)}([^${escapeRegExp(lastWord)}]*)$`),
          `${arg1}$1 `,
        );
        respond(audio, sysmsg, message, t("WBW_REPLACED", lastWord, arg1));
      } else {
        return respond(audio, sysmsg, message, t("WBW_TOO_DIFFERENT"));
      }
    } else {
      currentWBW += `${arg1} `;
      respond(audio, sysmsg, message, t("WBW_NEW_WORD"));
      const toSay =
        currentWBW.indexOf(".") === -1 ? currentWBW : currentWBW.slice(currentWBW.lastIndexOf(".") + 2);
      const voiceChannel = message.member?.voice.channel;
      if (voiceChannel) await audio.speak(voiceChannel, toSay);
      await db.run("insert or replace into BotState (key, value) values (?, ?)", [
        "last_wbw",
        message.author.id,
      ]);
    }
  });

  commands.register("newwbw", async (_args, message) => {
    await db.run("insert into WBWStories (story_text) values(?)", [currentWBW]);
    currentWBW = "";
    respond(audio, sysmsg, message, t("WBW_RESET"));
  });
};

function escapeRegExp(s: string): string {
  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}