import { Plugin, decorators as d, reply } from "knub";
import { Channel, Embed, EmbedOptions, Message, TextChannel, User, VoiceChannel } from "eris";
import {
  embedPadding,
  errorMessage,
  getMessages,
  stripObjectToScalars,
  successMessage,
  trimLines
} from "../utils";
import { GuildLogs } from "../data/GuildLogs";
import { LogType } from "../data/LogType";
import moment from "moment-timezone";
import humanizeDuration from "humanize-duration";
import { GuildCases } from "../data/GuildCases";
import { CaseType } from "../data/CaseType";

const MAX_SEARCH_RESULTS = 15;
const MAX_CLEAN_COUNT = 50;

export class UtilityPlugin extends Plugin {
  protected logs: GuildLogs;
  protected cases: GuildCases;

  getDefaultOptions() {
    return {
      permissions: {
        roles: false,
        level: false,
        search: false,
        clean: false,
        info: false,
        server: true
      },
      overrides: [
        {
          level: ">=50",
          permissions: {
            roles: true,
            level: true,
            search: true,
            clean: true,
            info: true,
            server: true
          }
        }
      ]
    };
  }

  onLoad() {
    this.logs = new GuildLogs(this.guildId);
    this.cases = new GuildCases(this.guildId);
  }

  @d.command("roles")
  @d.permission("roles")
  async rolesCmd(msg: Message) {
    const roles = (msg.channel as TextChannel).guild.roles.map(role => `${role.name} ${role.id}`);
    msg.channel.createMessage("```" + roles.join("\n") + "```");
  }

  @d.command("level", "[userId:string]")
  @d.permission("level")
  async levelCmd(msg: Message, args) {
    const member = args.userId ? this.guild.members.get(args.userId) : msg.member;

    if (!member) {
      msg.channel.createMessage(errorMessage("Member not found"));
      return;
    }

    const level = this.getMemberLevel(member);
    msg.channel.createMessage(
      `The permission level of ${member.username}#${member.discriminator} is **${level}**`
    );
  }

  @d.command("search", "<query:string$>")
  @d.permission("search")
  async searchCmd(msg: Message, args: { query: string }) {
    let [, query, inputPageNum] = args.query.match(/^(.*?)(?:\s([0-9]+))?$/);
    query = query.toLowerCase();

    const matchingMembers = this.guild.members.filter(member => {
      const fullUsername = `${member.user.username}#${member.user.discriminator}`;
      if (member.nick && member.nick.toLowerCase().indexOf(query) !== -1) return true;
      if (fullUsername.toLowerCase().indexOf(query) !== -1) return true;
      return false;
    });

    if (matchingMembers.length > 0) {
      let header;
      const resultText = matchingMembers.length === 1 ? "result" : "results";

      const paginated = matchingMembers.length > MAX_SEARCH_RESULTS;

      const pageInputMatch = args.query.match(/\s([0-9]+)$/);
      const inputPage = pageInputMatch ? parseInt(pageInputMatch[1], 10) : 1;
      const lastPage = Math.ceil(matchingMembers.length / MAX_SEARCH_RESULTS);
      const page = Math.min(lastPage, Math.max(1, inputPage));

      const from = (page - 1) * MAX_SEARCH_RESULTS;
      const to = Math.min(from + MAX_SEARCH_RESULTS, matchingMembers.length);

      if (paginated) {
        header = `Found ${matchingMembers.length} ${resultText} (showing ${from + 1}-${to})`;
      } else {
        header = `Found ${matchingMembers.length} ${resultText}`;
      }

      let lines = matchingMembers.map(member => {
        return `${member.user.username}#${member.user.discriminator} (${member.id})`;
      });
      lines.sort((a, b) => {
        return a.toLowerCase() < b.toLowerCase() ? -1 : 1;
      });
      lines = lines.slice(from, to);

      const footer = paginated
        ? "Add a page number to the end of the command to browse results"
        : "";

      msg.channel.createMessage(`${header}\n\`\`\`${lines.join("\n")}\`\`\`${footer}`);
    } else {
      msg.channel.createMessage(errorMessage("No results found"));
    }
  }

  async cleanMessages(channel: Channel, messageIds: string[], mod: User) {
    this.logs.ignoreLog(LogType.MESSAGE_DELETE, messageIds[0]);
    this.logs.ignoreLog(LogType.MESSAGE_DELETE_BULK, messageIds[0]);
    await this.bot.deleteMessages(channel.id, messageIds);
    this.logs.log(LogType.CLEAN, {
      mod: stripObjectToScalars(mod),
      channel: stripObjectToScalars(channel),
      count: messageIds.length
    });
  }

  @d.command("clean", "<count:number>")
  @d.command("clean all", "<count:number>")
  @d.permission("clean")
  async cleanAllCmd(msg: Message, args: { count: number }) {
    if (args.count > MAX_CLEAN_COUNT || args.count <= 0) {
      msg.channel.createMessage(
        errorMessage(`Clean count must be between 1 and ${MAX_CLEAN_COUNT}`)
      );
      return;
    }

    const messagesToClean = await getMessages(
      msg.channel as TextChannel,
      m => m.id !== msg.id,
      args.count
    );
    if (messagesToClean.length > 0) {
      await this.cleanMessages(msg.channel, messagesToClean.map(m => m.id), msg.author);
    }

    msg.channel.createMessage(
      successMessage(
        `Cleaned ${messagesToClean.length} ${messagesToClean.length === 1 ? "message" : "messages"}`
      )
    );
  }

  @d.command("clean user", "<userId:string> <count:number>")
  @d.permission("clean")
  async cleanUserCmd(msg: Message, args: { userId: string; count: number }) {
    if (args.count > MAX_CLEAN_COUNT || args.count <= 0) {
      msg.channel.createMessage(
        errorMessage(`Clean count must be between 1 and ${MAX_CLEAN_COUNT}`)
      );
      return;
    }

    const messagesToClean = await getMessages(
      msg.channel as TextChannel,
      m => m.id !== msg.id && m.author.id === args.userId,
      args.count
    );
    if (messagesToClean.length > 0) {
      await this.cleanMessages(msg.channel, messagesToClean.map(m => m.id), msg.author);
    }

    msg.channel.createMessage(
      successMessage(
        `Cleaned ${messagesToClean.length} ${messagesToClean.length === 1 ? "message" : "messages"}`
      )
    );
  }

  @d.command("clean bot", "<count:number>")
  @d.permission("clean")
  async cleanBotCmd(msg: Message, args: { count: number }) {
    if (args.count > MAX_CLEAN_COUNT || args.count <= 0) {
      msg.channel.createMessage(
        errorMessage(`Clean count must be between 1 and ${MAX_CLEAN_COUNT}`)
      );
      return;
    }

    const messagesToClean = await getMessages(
      msg.channel as TextChannel,
      m => m.id !== msg.id && m.author.bot,
      args.count
    );
    if (messagesToClean.length > 0) {
      await this.cleanMessages(msg.channel, messagesToClean.map(m => m.id), msg.author);
    }

    msg.channel.createMessage(
      successMessage(
        `Cleaned ${messagesToClean.length} ${messagesToClean.length === 1 ? "message" : "messages"}`
      )
    );
  }

  @d.command("info", "<userId:userId>")
  @d.permission("info")
  async infoCmd(msg: Message, args: { userId: string }) {
    const embed: EmbedOptions = {
      fields: []
    };

    const user = this.bot.users.get(args.userId);
    if (user) {
      const createdAt = moment(user.createdAt);
      const accountAge = humanizeDuration(moment().valueOf() - user.createdAt, {
        largest: 2,
        round: true
      });

      embed.title = `${user.username}#${user.discriminator}`;
      embed.thumbnail = { url: user.avatarURL };

      embed.fields.push({
        name: "User information",
        value:
          trimLines(`
          ID: ${user.id}
          Profile: <@!${user.id}>
          Created: ${accountAge} ago (${createdAt.format("YYYY-MM-DD[T]HH:mm:ss")})
        `) + embedPadding
      });
    } else {
      embed.title = `Unknown user`;
    }

    const member = this.guild.members.get(args.userId);
    if (member) {
      const joinedAt = moment(member.joinedAt);
      const joinAge = humanizeDuration(moment().valueOf() - member.joinedAt, {
        largest: 2,
        round: true
      });
      const roles = member.roles.map(id => this.guild.roles.get(id));

      embed.fields.push({
        name: "Member information",
        value:
          trimLines(`
          Joined: ${joinAge} ago (${joinedAt.format("YYYY-MM-DD[T]HH:mm:ss")})
          ${roles.length > 0 ? "Roles: " + roles.map(r => r.name).join(", ") : ""}
        `) + embedPadding
      });
    }

    const cases = await this.cases.getByUserId(args.userId);
    if (cases.length > 0) {
      cases.sort((a, b) => {
        return a.created_at < b.created_at ? -1 : 1;
      });

      const caseSummaries = cases.map(c => {
        return `${CaseType[c.type]} (#${c.case_number})`;
      });

      embed.fields.push({
        name: "Cases",
        value: trimLines(`
          Total cases: ${cases.length}
          Summary: ${caseSummaries.join(", ")}
        `)
      });
    }

    msg.channel.createMessage({ embed });
  }

  @d.command("server")
  @d.permission("server")
  async serverCmd(msg: Message) {
    await this.guild.fetchAllMembers();

    const embed: EmbedOptions = {
      fields: []
    };

    embed.thumbnail = { url: this.guild.iconURL };

    const createdAt = moment(this.guild.createdAt);
    const serverAge = humanizeDuration(moment().valueOf() - this.guild.createdAt, {
      largest: 2,
      round: true
    });

    embed.fields.push({
      name: "Server information",
      value:
        trimLines(`
        Created: ${serverAge} ago (${createdAt.format("YYYY-MM-DD[T]HH:mm:ss")})
        Members: ${this.guild.memberCount}
        ${this.guild.features.length > 0 ? "Features: " + this.guild.features.join(", ") : ""}
      `) + embedPadding
    });

    const textChannels = this.guild.channels.filter(channel => channel instanceof TextChannel);
    const voiceChannels = this.guild.channels.filter(channel => channel instanceof VoiceChannel);

    embed.fields.push({
      name: "Counts",
      value:
        trimLines(`
        Roles: ${this.guild.roles.size}
        Text channels: ${textChannels.length}
        Voice channels: ${voiceChannels.length}
      `) + embedPadding
    });

    const onlineMembers = this.guild.members.filter(m => m.status === "online");
    const dndMembers = this.guild.members.filter(m => m.status === "dnd");
    const idleMembers = this.guild.members.filter(m => m.status === "idle");
    const offlineMembers = this.guild.members.filter(m => m.status === "offline");

    embed.fields.push({
      name: "Members",
      value: trimLines(`
        Online: **${onlineMembers.length}**
        Idle: **${idleMembers.length}**
        DND: **${dndMembers.length}**
        Offline: **${offlineMembers.length}**
      `)
    });

    msg.channel.createMessage({ embed });
  }
}