import { Interaction, ChatInputCommandInteraction, ButtonInteraction, TextChannel, StringSelectMenuInteraction } from "discord.js";
import { handleButton, handleScoreSubmitButton } from "@handlers/buttons";
import { handleTgCommand } from "@commands/tg";
import { handleTgConfigCommand } from "@commands/tgConfig";
import { handleBorrowAcceptButton } from "@subcommands/char/accept";
import { handleBorrowDeclineButton } from "@subcommands/char/decline";
import { handleConflictButton } from "@systems/conflict";
import { handleImpersonateButton } from "@subcommands/impersonate";
import { handleAutocomplete } from "@handlers/autocomplete";
import { setActiveCharacter, getCharacterByName, getCharacters } from "@systems/characters";
import { setPersistentPreference, clearSessionBorrowForUser, getEffectiveCharacter } from "@systems/borrow";
import { polls, updatePollMessage } from "@systems/poll";
import { cfg } from "@systems/config";
import { resolveMessage, nowFormatted } from "@systems/messages";
import { format } from "@format";
import { modals } from "@handlers/modals";
import fs from "fs";
import path from "path";

async function handleSwitchAfterReclaim(btn: ButtonInteraction): Promise<void> {
  const parts        = btn.customId.split(":");
  const userKey      = parts[1];
  const charName     = parts[2];
  const prevVoteType = (parts[3] ?? "yes") as "yes" | "no";

  const chars = JSON.parse(
    fs.readFileSync(path.join(__dirname, "../../data/characters.json"), "utf8")
  );

  let resolvedChar: any = null;
  let borrowedFrom: string | null = null;

  // Try own char first
  const ownEntry = chars[userKey]?.characters?.find((c: any) => c.name === charName);
  if (ownEntry) {
    setActiveCharacter(userKey, charName);
    clearSessionBorrowForUser(userKey);
    resolvedChar = ownEntry;
  } else {
    // Try shared char
    for (const [ownerKey, data] of Object.entries(chars) as [string, any][]) {
      const char = data.characters?.find(
        (c: any) => c.name === charName && c.sharedWith?.includes(userKey)
      );
      if (char) {
        setPersistentPreference(userKey, ownerKey, charName);
        clearSessionBorrowForUser(userKey);
        resolvedChar  = char;
        borrowedFrom  = ownerKey;
        break;
      }
    }
  }

  if (!resolvedChar) {
    await btn.reply({ content: `❌ Could not switch to **${charName}**.`, ephemeral: true });
    return;
  }

  // Re-add to poll with previous vote type
  const slot  = [...polls.keys()][0];
  const state = slot !== undefined ? polls.get(slot) : null;

  if (state && !state.locked && state.confirmed === null) {
    const { char } = getEffectiveCharacter(userKey);
    const now       = nowFormatted();
    const publicMsg = resolveMessage("public", prevVoteType, 1, userKey, null, null);
    const voteEntry = {
      userKey,
      displayName:     charName,
      characterName:   char?.name ?? charName,
      characterClass:  char?.class ?? resolvedChar.class,
      characterLevel:  char?.level ?? resolvedChar.level,
      characterNation: char?.nation ?? resolvedChar.nation,
      borrowedFrom:    borrowedFrom ?? undefined,
      discordId:       btn.user.id,
      votedAt:         now,
      publicMessage:   publicMsg ?? undefined,
    };

    for (const [id, entry] of [...state.yes.entries(), ...state.no.entries()]) {
      if (entry.userKey === userKey) {
        state.yes.delete(id);
        state.no.delete(id);
      }
    }

    if (prevVoteType === "yes") {
      state.yes.set(`switch_reclaim:${userKey}`, voteEntry);
    } else {
      state.no.set(`switch_reclaim:${userKey}`, voteEntry);
    }

    console.log(`[switch_reclaim] cleaning up for userKey=${userKey}`);
    console.log(`[switch_reclaim] yes keys:`, [...state.yes.entries()].map(([id, e]) => `${id}:${e.userKey}`));
    console.log(`[switch_reclaim] no keys:`,  [...state.no.entries()].map(([id, e]) => `${id}:${e.userKey}`));

    const channel = await btn.client.channels.fetch(cfg("pollChannelId")) as TextChannel;
    await updatePollMessage(channel, slot!);
  }

  const charDisplay = resolvedChar ? format.char(resolvedChar) : charName;
  const borrowNote  = borrowedFrom ? ` *(shared by ${borrowedFrom})*` : "";
  await btn.reply({
    content: `🔄 ${charDisplay}${borrowNote}${state ? ` — re-added to poll as **${prevVoteType}**.` : ""}`,
    ephemeral: true,
  });
}

export async function handleInteraction(interaction: Interaction): Promise<void> {
  try {
    if (interaction.isAutocomplete()) {
      await handleAutocomplete(interaction);
      return;
    }

    if (interaction.isButton()) {
      const btn = interaction as ButtonInteraction;

      console.log("[interactions] interaction btnId:", btn.customId);
      if (btn.customId.startsWith("conflict_")) {
        console.log("[interactions] routing to conflict handler:", btn.customId);
        return await handleConflictButton(btn);
      }

      if (btn.customId.startsWith("impersonate_")) {
        return await handleImpersonateButton(btn);
      }

      if (btn.customId.startsWith("switch_after_reclaim:")) {
        return await handleSwitchAfterReclaim(btn);
      }

      if (btn.customId.startsWith("borrow_accept:")) {
        const [, ownerKey, requesterKey] = btn.customId.split(":");
        return await handleBorrowAcceptButton(btn, ownerKey, requesterKey);
      }

      if (btn.customId.startsWith("borrow_decline:")) {
        const [, ownerKey, requesterKey] = btn.customId.split(":");
        return await handleBorrowDeclineButton(btn, ownerKey, requesterKey);
      }

      if (btn.customId === "tg_score_submit") {
        return await handleScoreSubmitButton(btn);
      }

      return await handleButton(btn);
    }

    if (interaction.isModalSubmit()) {
      return await modals.handleModal(interaction);
    }

    if (interaction.isStringSelectMenu()) {
      const sel = interaction as StringSelectMenuInteraction;
      if (sel.customId.startsWith("score_slot_select:")) {
        const userKey = sel.customId.split(":")[1];
        const slot    = parseInt(sel.values[0], 10);
        await sel.showModal(modals.buildScoreModal(userKey, slot));
        return;
      }
    }

    if (interaction.isChatInputCommand()) {
      const cmd = interaction as ChatInputCommandInteraction;
      if (cmd.commandName === "tg")        await handleTgCommand(cmd);
      if (cmd.commandName === "tg-config") await handleTgConfigCommand(cmd);
    }
  } catch (err) {
    console.error("Interaction error:", err);
    try {
      const msg = { content: "❌ An error occurred.", ephemeral: true };
      if ((interaction as any).replied || (interaction as any).deferred) {
        await (interaction as any).followUp(msg);
      } else {
        await (interaction as any).reply(msg);
      }
    } catch {}
  }
}