import {
  PermissionFlagsBits,
  type GuildBasedChannel,
  type GuildTextBasedChannel
} from 'discord.js';
import { t } from '@nexumi/shared';
import type { SlashCommand } from '../../types.js';
import { getGuildLocale } from '../../i18n.js';
import { requirePermission } from '../../permissions.js';
import { ephemeral } from '../../interaction-reply.js';
import { verifyCommandData } from './command-definitions.js';
import { getVerificationConfig, updateVerificationConfig } from './service.js';
import { buildVerificationPanel } from './handlers.js';

function botCanPostPanel(
  channel: GuildBasedChannel,
  meId: string
): channel is GuildTextBasedChannel {
  if (!channel.isTextBased() || channel.isDMBased()) {
    return false;
  }
  const permissions = channel.permissionsFor(meId);
  if (!permissions) {
    return false;
  }
  return (
    permissions.has(PermissionFlagsBits.ViewChannel) &&
    permissions.has(PermissionFlagsBits.SendMessages) &&
    permissions.has(PermissionFlagsBits.EmbedLinks)
  );
}

const verifyCommand: SlashCommand = {
  data: verifyCommandData,
  async execute(interaction, context) {
    const locale = await getGuildLocale(context.prisma, interaction.guildId);
    if (!interaction.inGuild()) {
      await interaction.reply({ content: t(locale, 'generic.guildOnly'), ...ephemeral() });
      return;
    }
    if (!(await requirePermission(interaction, PermissionFlagsBits.ManageGuild, locale))) {
      return;
    }

    const guildId = interaction.guildId!;
    const sub = interaction.options.getSubcommand();

    if (sub === 'setup') {
      const channel = interaction.options.getChannel('channel', true);
      const verifiedRole = interaction.options.getRole('verified_role', true);
      const unverifiedRole = interaction.options.getRole('unverified_role');
      const mode = (interaction.options.getString('mode') ?? 'BUTTON') as 'BUTTON' | 'CAPTCHA';
      const captchaProvider = (interaction.options.getString('captcha_provider') ??
        'MATH') as
        | 'MATH'
        | 'RECAPTCHA_V2'
        | 'RECAPTCHA_V3'
        | 'HCAPTCHA'
        | 'TURNSTILE';
      const minAccountAgeDays = interaction.options.getInteger('min_account_age_days') ?? 0;
      const failAction = (interaction.options.getString('fail_action') ?? 'KICK') as
        | 'KICK'
        | 'BAN'
        | 'NONE';
      const altDetectionEnabled =
        interaction.options.getBoolean('alt_detection') ?? false;

      await updateVerificationConfig(context.prisma, guildId, {
        enabled: true,
        channelId: channel.id,
        verifiedRoleId: verifiedRole.id,
        unverifiedRoleId: unverifiedRole?.id ?? null,
        mode,
        captchaProvider,
        minAccountAgeDays,
        failAction,
        altDetectionEnabled
      });

      await interaction.reply({ content: t(locale, 'verification.setupDone'), ...ephemeral() });
      return;
    }

    const config = await getVerificationConfig(context.prisma, guildId);
    if (!config.enabled || !config.verifiedRoleId) {
      await interaction.reply({
        content: t(locale, 'verification.notConfigured'),
        ...ephemeral()
      });
      return;
    }

    const panelChannelOption = interaction.options.getChannel('channel');
    const panelChannel = panelChannelOption
      ? await interaction.guild!.channels.fetch(panelChannelOption.id)
      : config.channelId
        ? await interaction.guild!.channels.fetch(config.channelId)
        : null;

    const me = interaction.guild!.members.me;
    if (!panelChannel || !me || !botCanPostPanel(panelChannel, me.id)) {
      await interaction.reply({
        content: t(locale, 'verification.panelMissingPermission'),
        ...ephemeral()
      });
      return;
    }

    const panel = buildVerificationPanel(config, locale);
    const message = await panelChannel.send(panel);
    await context.prisma.verificationConfig.update({
      where: { guildId },
      data: {
        panelChannelId: panelChannel.id,
        panelMessageId: message.id
      }
    });
    await interaction.reply({ content: t(locale, 'verification.panelPosted'), ...ephemeral() });
  }
};

export const verificationCommands: SlashCommand[] = [verifyCommand];