import {
  AttachmentBuilder,
  AutocompleteInteraction,
  ChatInputCommandInteraction,
  CommandInteraction,
  EmbedBuilder,
  GuildMember,
  MessageFlags,
  SlashCommandBuilder,
  time
} from "discord.js";
import {AutocompleteCommand, ChatInteractionCommand, Command} from "./Command";
import {Container} from "../../Container/Container";
import {GroupSelection} from "../CommandPartials/GroupSelection";
import {UserError} from "../UserError";
import {PlaydateModel} from "../../Database/Models/PlaydateModel";
import {PlaydateRepository} from "../../Database/Repositories/PlaydateRepository";
import {GroupModel} from "../../Database/Models/GroupModel";
import * as ics from 'ics';
import ical from 'node-ical';
import {GroupConfigurationRepository} from "../../Database/Repositories/GroupConfigurationRepository";
import {GroupRepository} from "../../Database/Repositories/GroupRepository";
import {
  GroupConfigurationProvider,
  RuntimeGroupConfiguration
} from "../../Configuration/Groups/GroupConfigurationProvider";
import {ConfigurationHandler} from "../../Configuration/ConfigurationHandler";
import {PermissionError} from "../PermissionError";
import {EmbedLibrary, EmbedType} from "../EmbedLibrary";
import {GroupConfigurationModel} from "../../Database/Models/GroupConfigurationModel";
import parser from "any-date-parser";
import {TimezoneHandler} from "../../Configuration/TimezoneHandler";
import _ from "lodash";

export class PlaydatesCommand implements Command, AutocompleteCommand, ChatInteractionCommand {
  definition(): SlashCommandBuilder {
    // @ts-expect-error Command builder is improperly marked as incomplete.
    return new SlashCommandBuilder()
      .setName("playdate")
      .setDescription("Manage your playdates")
      .addSubcommand((subcommand) => subcommand
        .setName("create")
        .setDescription("Creates a new playdate")
        .addIntegerOption(GroupSelection.createOptionSetup())
        .addStringOption((option) => option
          .setName("from")
          .setDescription("Defines the start date & time. Your desired format is probably support.")
        )
        .addStringOption((option) => option
          .setName("to")
          .setDescription("Defines the end date & time. Your desired format is probably support.")
        )
      )
      .addSubcommand((subcommand) => subcommand
        .setName("list")
        .setDescription("Lists all playdates")
        .addIntegerOption(GroupSelection.createOptionSetup())
      )
      .addSubcommand((subcommand) => subcommand
        .setName("remove")
        .setDescription("Removes a playdate")
        .addIntegerOption(GroupSelection.createOptionSetup())
        .addIntegerOption((option) => option
          .setName("playdate")
          .setDescription("Selects a playdate")
          .setRequired(true)
          .setAutocomplete(true)
        )
      )
      .addSubcommand(subcommand => subcommand
        .setName('import')
        .setDescription("Imports playdates from iCal files")
        .addIntegerOption(GroupSelection.createOptionSetup())
        .addAttachmentOption(attachment => attachment
          .setName("file")
          .setDescription("The iCal File to import")
          .setRequired(true)
        )
      )
      .addSubcommand((subcommand) => subcommand
        .setName("export")
        .setDescription("Exports a playdate as iCal file.")
        .addIntegerOption(GroupSelection.createOptionSetup())
        .addIntegerOption((option) => option
          .setName("playdate")
          .setDescription("Selects a playdate to export")
          .setAutocomplete(true)
        )
        .addBooleanOption(option => option
          .setName("future-dates")
          .setDescription("Exports the next playdates as a ical file")
        )
      );
  }

  async execute(interaction: ChatInputCommandInteraction): Promise<void> {
    const group = GroupSelection.getGroup(interaction);

    switch (interaction.options.getSubcommand()) {
      case "create":
        await this.create(interaction, group);
        break;
      case "remove":
        await this.delete(interaction, group);
        break;
      case "list":
        await this.list(interaction, group);
        break;
      case "import":
        await this.import(interaction, group);
        break;
      case "export":
        await this.export(interaction, group);
        break;
      default:
        throw new UserError("This subcommand is not yet implemented.");
    }
  }

  async create(interaction: CommandInteraction, group: GroupModel): Promise<void> {
    if (!this.interactionIsAllowedToManage(<ChatInputCommandInteraction>interaction, group)) {
      throw new UserError(
        "You are not allowed to create playdates for this group.",
        "Ask your Game Master to add the playdate or ask him to allow everyone to do so."
      )
    }
    
    const timezoneHandler = new TimezoneHandler(
      interaction.guildId ?? '',
      group
    );
    
    const [fromDate, toDate] = timezoneHandler.use(() => {
      return [
        parser.fromString(<string>interaction.options.get("from")?.value ?? ''),
        parser.fromString(<string>interaction.options.get("to")?.value ?? '')
      ]
    })
    

    if (!fromDate.isValid()) {
      throw new UserError("No date or invalid date format for the from parameter.");
    }

    if (!fromDate.isValid()) {
      throw new UserError("No date or invalid date format for the to parameter.");
    }

    if (fromDate.getTime() > toDate.getTime()) {
      throw new UserError("The to-date can't be earlier than the from-date");
    }

    const playdateRepo = Container.get<PlaydateRepository>(PlaydateRepository.name);

    const collidingTimes = playdateRepo.findPlaydatesInRange(fromDate, toDate, group);
    if (collidingTimes.length > 0) {
      throw new UserError("The playdate collides with another playdate. Please either remove the old one or choose a different time.")
    }

    const playdate: Partial<PlaydateModel> = {
      group: group,
      from_time: fromDate,
      to_time: toDate,
    }

    playdateRepo.create(playdate);

    const embed = EmbedLibrary.withGroup(
      group,
      "Created a play-date.",
      ":white_check_mark: Your playdate has been created! You and your group get notified, when its time.",
      EmbedType.Success
    ).setFields({
        name: "Created playdate",
        value: `${time(new Date(fromDate), 'F')} - ${time(new Date(toDate), 'F')}`,
    })

    await interaction.reply({
      embeds: [
        embed
      ],
      flags: MessageFlags.Ephemeral,
    })
  }

  async handleAutocomplete(interaction: AutocompleteInteraction): Promise<void> {
    const option = interaction.options.getFocused(true);
    if (option.name == "group") {
      await GroupSelection.handleAutocomplete(interaction);
      return;
    }

    if (option.name != 'playdate') {
      return;
    }

    const group = GroupSelection.getGroup(interaction);

    const timezone = new TimezoneHandler(
      interaction.guildId ?? '',
      group
    );
    const playdates = Container.get<PlaydateRepository>(PlaydateRepository.name).findFromGroup(group);
    await interaction.respond(
      timezone.use(() => {
        return _.slice(playdates, 0, 25).map(playdate => {
          return {
            name: `${playdate.from_time.toLocaleString()} - ${playdate.to_time.toLocaleString()}`,
            value: <number>playdate.id
          }
        })
      })
    )
  }

  private async list(interaction: ChatInputCommandInteraction, group: GroupModel) {
    const playdates = Container.get<PlaydateRepository>(PlaydateRepository.name).findFromGroup(group);

    const embed = EmbedLibrary.withGroup(
      group,
      "Created a play-date.",
      null, 
      EmbedType.Info
    ).setFields(
      playdates.map((playdate) => {
        return {
          name: `${time(playdate.from_time, 'F')} - ${time(playdate.to_time, 'F')}`,
          value: `${time(playdate.from_time, 'R')}`
        }
      })
    )
    
    await interaction.reply({
      embeds: [
        embed
      ],
      flags: MessageFlags.Ephemeral,
    })
  }

  private async delete(interaction: ChatInputCommandInteraction, group: GroupModel): Promise<void> {
    if (!this.interactionIsAllowedToManage(<ChatInputCommandInteraction>interaction, group)) {
      throw new PermissionError(
        "You are not allowed to delete playdates for this group.",
        "Ask your Game Master to delete the playdate or ask him to allow everyone to do so."
      )
    }
    
    const playdateId = interaction.options.getInteger("playdate", true)

    const repo = Container.get<PlaydateRepository>(PlaydateRepository.name);
    const selected = repo.getById(playdateId);
    if (!selected) {
      throw new UserError("No playdate found");
    }

    if (selected.group?.id != group.id) {
      throw new UserError("No playdate found");
    }

    repo.delete(playdateId);
    
    const embed = EmbedLibrary.withGroup(
      group,
      "Playdate deleted",
      `:x: Deleted ${time(selected.from_time, 'F')} - ${time(selected.to_time, 'F')}`,
      EmbedType.Success
    );
    await interaction.reply({
      embeds: [
        embed
      ],
      flags: MessageFlags.Ephemeral,
    })
  }
  
  private async import(interaction: ChatInputCommandInteraction, group: GroupModel): Promise<void> {
    if (!this.interactionIsAllowedToManage(<ChatInputCommandInteraction>interaction, group)) {
      throw new UserError(
        "You are not allowed to create playdates for this group.",
        "Ask your Game Master to add the playdate or ask him to allow everyone to do so."
      )
    }
    
    const file = interaction.options.getAttachment('file', true);
    const mimeType = file.contentType?.split(';')[0];
    if (mimeType !== "text/calendar") {
      throw new UserError(`Invalid ical file. Got: ${mimeType}`, "Providing a valid iCal file");
    }
    
    await interaction.deferReply({
      flags: MessageFlags.Ephemeral
    });
    
    const playdateRepo = Container.get<PlaydateRepository>(PlaydateRepository.name);
    
    const icalFile = await ical.async.fromURL(file.url);
    const playdates: PlaydateModel[] = [];
    for (const event of Object.values(icalFile)) {
      if (event.type !== 'VEVENT') {
        continue;
      }
      
      const playdate: Partial<PlaydateModel> = {
        group: group,
        from_time: event.start,
        to_time: event.end
      }
      
      const id = playdateRepo.create(playdate);
      playdates.push(<PlaydateModel>{
        id,
        ...playdate
      });
    }
    
    const embed = EmbedLibrary.withGroup(
      group, 
      "Imported play-dates",
      `:white_check_mark: Your ${playdates.length} playdates has been created! You and your group get notified, when its time.`,
      EmbedType.Success
    ).setFields({
      name: "Created playdates",
      value: playdates.map((playdate) => `${time(playdate.from_time, 'F')} - ${time(playdate.to_time, 'F')}`).join('\n')
    })
    
    interaction.followUp({
      embeds: [embed],
      flags: MessageFlags.Ephemeral
    })
  }
  
  private async export(interaction: ChatInputCommandInteraction, group: GroupModel): Promise<void> {
    const groupConfig = new ConfigurationHandler<
      GroupConfigurationModel,
      RuntimeGroupConfiguration
    >(
      new GroupConfigurationProvider(
        Container.get<GroupConfigurationRepository>(GroupConfigurationRepository.name),
        group
      )
    ).getCompleteConfiguration();
    
    const playdates = this.getExportTargets(interaction, group);
    
    if (playdates.length < 1) {
      await interaction.reply({
        embeds: [
          new EmbedBuilder()
            .setTitle("Export failed")
            .setDescription(`:x: No playdates found under those filters.`)
        ],
        flags: MessageFlags.Ephemeral
      });
      return 
    } 
    
    const result = ics.createEvents(
      playdates.map((playdate) => {
        return {
          start: ics.convertTimestampToArray(playdate.from_time.getTime(), ''),
          startInputType: 'utc',
          startOutputType: 'utc',
          end: ics.convertTimestampToArray(playdate.to_time.getTime(), ''),
          endInputType: 'utc',
          endOutputType: 'utc',
          title: groupConfig.calendar.title ?? `PnP with ${group.name}`,
          description: groupConfig.calendar.description ?? undefined,
          location: groupConfig.calendar.location ?? undefined,
          status: "CONFIRMED",
          busyStatus: "FREE",
          categories: ['PnP']
        }
      })
    );
    if (!result.value) {
      throw new Error("Failed creating ics file...")
    }
    const attachment = new AttachmentBuilder(Buffer.from(result.value), {
      name: "ICSExport.ics",
      description: "Your export :)"
    });
    interaction.reply({
      files: [attachment],
      flags: MessageFlags.Ephemeral
    })
  }
  
  private getExportTargets(interaction: ChatInputCommandInteraction, group: GroupModel): PlaydateModel[] {

    const repo = Container.get<PlaydateRepository>(PlaydateRepository.name);
    const nextPlaydates = interaction.options.getBoolean("future-dates") ?? false;
    if (nextPlaydates) {
      return repo.findPlaydatesInRange(new Date());
    }
    
    const playdateId = interaction.options.getInteger('playdate');
    if (!playdateId) {
      throw new UserError("Nothing to export", "Please specify what you want to export.");
    }
    
    const playdate = repo.getById(playdateId);
    if (!playdate) {
      throw new UserError("Specified playdate id is invalid");
    }
    
    return [playdate];
  }
  
  private interactionIsAllowedToManage(interaction: ChatInputCommandInteraction, group: GroupModel): boolean {
    const interactionMemberId = interaction.member?.user.id;
    if (group.leader.memberid === interactionMemberId) {
      return true;
    }
    
    const groupRepo = Container.get<GroupRepository>(GroupRepository.name);
    if (!groupRepo.isMemberInGroup(<GuildMember>interaction.member, group)) {
      return false;
    }
    
    const config = new ConfigurationHandler(
      new GroupConfigurationProvider(
        Container.get<GroupConfigurationRepository>(GroupConfigurationRepository.name),
        group
      )
    );
    return config.getConfigurationByPath("permissions.allowMemberManagingPlaydates").value === true;
  }
}