import { ActionRowBuilder, ButtonBuilder, ButtonStyle, Client, DiscordAPIError, EmbedBuilder, Message, SendableChannels } from 'discord.js';
import { config } from '../config';
import { Database } from '../shared/Database';
import { Ticket, TicketPhrase, TicketUpdate } from '../types';
import { PostAction, getE621Post, getE621User, spoilerOrBlacklist } from './e621-utils';
import { getAuthor, getColor, getDescription, getFields } from './event-utils';
import { humanizeCapitalization } from './string-utils';
import { shouldAlert } from './ticket-utils';

export async function ticketUpdateHandler(client: Client, update: string) {
  const data: TicketUpdate = JSON.parse(update);

  if (data.action == 'create') {
    postTicket(client, data);
  } else {
    updateTicket(client, data);
  }
}

async function postTicket(client: Client, data: TicketUpdate) {
  const guildSettings = await Database.getGuildSettings(config.DISCORD_GUILD_ID!);

  if (!guildSettings || !guildSettings.tickets_channel_id) return;

  const channel = await client.channels.fetch(guildSettings.tickets_channel_id);

  if (!channel || !channel.isSendable()) return;

  const ticket = data.ticket;

  const embed = await createEmbedFromTicket(ticket);

  const row = await getButtons(ticket);

  const message = await channel.send({ embeds: [embed], components: [row] });

  await Database.putTicketOrUpdate(ticket.id, message.id);

  sendTicketAlerts(ticket, channel);
}

async function updateTicket(client: Client, data: TicketUpdate) {
  const guildSettings = await Database.getGuildSettings(config.DISCORD_GUILD_ID!);

  if (!guildSettings || !guildSettings.tickets_channel_id) return;

  const channel = await client.channels.fetch(guildSettings.tickets_channel_id);

  if (!channel || !channel.isSendable()) return;

  const messageId = await Database.getTicketMessageId(data.ticket.id);

  if (!messageId) return postTicket(client, data);

  let message: Message | undefined;

  try {
    message = await channel.messages.fetch(messageId);
  } catch (e) {
    // Ignore unknown message errors
    if (!(e instanceof DiscordAPIError && e.code == 10008)) {
      throw e;
    }
  }

  if (!message || message.author.id != config.DISCORD_CLIENT_ID) return postTicket(client, data);

  const embed = await createEmbedFromTicket(data.ticket);

  await message.edit({ embeds: [embed] });
}

function getTitle(ticket: Ticket): string {
  if (!ticket.target) return `${humanizeCapitalization(ticket.category)} report by ${ticket.user}`;

  switch (ticket.category) {
    case 'blip':
      return `Blip by ${ticket.target}`;
    case 'comment':
      return `Comment by ${ticket.target}`;
    case 'dmail':
      return `DMail sent by ${ticket.target}`;
    case 'forum':
      return `Forum post by ${ticket.target}`;
    case 'pool':
      return `Pool ${ticket.target}`;
    case 'post':
      return `Post uploaded by ${ticket.target}`;
    case 'set':
      return `Wow, a rare set report! ${ticket.target}`;
    case 'user':
      return `User ${ticket.target}`;
    case 'wiki':
      return `Wiki page ${ticket.target}`;
    default:
      return 'Uknown ticket category';
  }
}

function getURL(ticket: Ticket): string {
  return `${config.E621_BASE_URL}/tickets/${ticket.id}`;
}

async function createEmbedFromTicket(ticket: Ticket): Promise<EmbedBuilder> {
  return new EmbedBuilder()
    .setTitle(getTitle(ticket))
    .setURL(await getURL(ticket))
    .setDescription(await getDescription(ticket))
    .setAuthor(getAuthor(ticket))
    .setColor(getColor(ticket))
    .setFields(...getFields(ticket))
    .setFooter({ text: `Ticket #${ticket.id}` });
}

async function getButtons(ticket: Ticket): Promise<ActionRowBuilder<ButtonBuilder>> {
  const row = new ActionRowBuilder<ButtonBuilder>();

  const primaryButton = new ButtonBuilder()
    .setStyle(ButtonStyle.Link);

  let skipPrimary = false;

  if (ticket.category == 'blip') {
    primaryButton
      .setLabel('Open Blip')
      .setURL(`${config.E621_BASE_URL}/blips/${ticket.target_id}`);
  } else if (ticket.category == 'comment') {
    primaryButton
      .setLabel('Open Comment')
      .setURL(`${config.E621_BASE_URL}/comments/${ticket.target_id}`);
  } else if (ticket.category == 'dmail') {
    primaryButton
      .setLabel('Open DMail')
      .setURL(`${config.E621_BASE_URL}/dmails/${ticket.target_id}`);
  } else if (ticket.category == 'forum') {
    primaryButton
      .setLabel('Open Forum Post')
      .setURL(`${config.E621_BASE_URL}/forum_posts/${ticket.target_id}`);
  } else if (ticket.category == 'pool') {
    primaryButton
      .setLabel('Open Pool')
      .setURL(`${config.E621_BASE_URL}/pools/${ticket.target_id}`);
  } else if (ticket.category == 'post') {
    const post = await getE621Post(ticket.target_id);

    if (post && spoilerOrBlacklist(post).action == PostAction.Blacklist) skipPrimary = true;
    else {
      primaryButton
        .setLabel('Open Post')
        .setURL(`${config.E621_BASE_URL}/posts/${ticket.target_id}`);
    }
  } else if (ticket.category == 'set') {
    primaryButton
      .setLabel('Open Set')
      .setURL(`${config.E621_BASE_URL}/post_sets/${ticket.target_id}`);
  } else if (ticket.category == 'user') {
    primaryButton
      .setLabel('Open User')
      .setURL(`${config.E621_BASE_URL}/users/${ticket.target_id}`);
  } else if (ticket.category == 'wiki') {
    primaryButton
      .setLabel('Open Wiki')
      .setURL(`${config.E621_BASE_URL}/wikis/${ticket.target_id}`);
  } else {
    console.error('Unknown ticket type:');
    console.error(JSON.stringify(ticket, null, 2));
    skipPrimary = true;
  }

  if (!skipPrimary) row.addComponents(primaryButton);

  if (ticket.category == 'blip' || ticket.category == 'comment' || ticket.category == 'dmail' || ticket.category == 'forum') {
    const button = new ButtonBuilder()
      .setLabel('Open Target User')
      .setStyle(ButtonStyle.Link)
      .setURL(`${config.E621_BASE_URL}/users/${ticket.accused_id}`);

    row.addComponents(button);
  } else if (ticket.category == 'post') {
    const user = await getE621User(ticket.target!);

    if (user) {
      const button = new ButtonBuilder()
        .setLabel('Open Target User')
        .setStyle(ButtonStyle.Link)
        .setURL(`${config.E621_BASE_URL}/users/${user.id}`);

      row.addComponents(button);
    }
  }

  return row;
}

async function sendTicketAlerts(ticket: Ticket, channel: SendableChannels) {
  const guildSettings = await Database.getGuildSettings(config.DISCORD_GUILD_ID!);

  if (!guildSettings || !guildSettings.admin_role_id) return;

  const usersToMention: string[] = [];
  const rolesToMention: string[] = [];
  let content = '';

  await Database.getAllTicketPhrases((ticketPhrase: TicketPhrase) => {
    const { alert, match } = shouldAlert(ticketPhrase, ticket);
    if (alert) {
      const mention = ticketPhrase.user_id == 'admin' ? `<@&${guildSettings.admin_role_id!}>` : `<@${ticketPhrase.user_id}>`;

      if (ticketPhrase.user_id == 'admin' && !rolesToMention.includes(guildSettings.admin_role_id!)) {
        rolesToMention.push(guildSettings.admin_role_id!);
      } else if (!usersToMention.includes(ticketPhrase.user_id)) {
        usersToMention.push(ticketPhrase.user_id);
      }

      content += `${mention}: ${match}\n`;
    }
  });

  if (content.length == 0) return;

  await channel.send({
    content,
    allowedMentions: {
      users: usersToMention,
      roles: rolesToMention
    }
  });
}