import {
  FIRST_MINIMAL_ARCHIVED_RATING_SEASON,
  getAccountInfo,
  getArchivedLatestSeasonNumber,
  getArchivedRatingLeaderboard,
  getClanAccountInfo,
  getRatingInfo,
  getRatingLeague,
  getRatingNeighbors,
  imgur,
  isOnGoingRatingSeason,
  LEAGUES,
  type RatingInfo,
  RatingLeaderboard,
  type Region,
} from "@blitzkit/core";
import { literals } from "@blitzkit/i18n";
import {
  type APIApplicationCommandOptionChoice,
  Locale,
  SlashCommandSubcommandBuilder,
} from "discord.js";
import { range } from "lodash-es";
import markdownEscape from "markdown-escape";
import { CommandWrapper } from "../components/CommandWrapper";
import * as Leaderboard from "../components/Leaderboard";
import { TitleBar } from "../components/TitleBar";
import { UserError } from "../core/blitzkit/userError";
import { addRegionChoices } from "../core/discord/addRegionChoices";
import { addUsernameChoices } from "../core/discord/addUsernameChoices";
import { autocompleteUsername } from "../core/discord/autocompleteUsername";
import { createLocalizedCommand } from "../core/discord/createLocalizedCommand";
import { localizationObject } from "../core/discord/localizationObject";
import { resolvePlayerFromCommand } from "../core/discord/resolvePlayerFromCommand";
import { translator } from "../core/localization/translator";
import type { CommandRegistry } from "../events/interactionCreate";

interface SimplifiedPlayer {
  id: number;
  score: number;
  position: number;
  clan: string | undefined;
  nickname: string;
}

const DEFAULT_LIMIT = 10;

export const ratingLeaderboardCommand = new Promise<CommandRegistry>(
  async (resolve) => {
    const latestArchivedSeasonNumber = await getArchivedLatestSeasonNumber();
    const onGoingSeason = await isOnGoingRatingSeason();
    const seasonNumbers = range(
      FIRST_MINIMAL_ARCHIVED_RATING_SEASON,
      latestArchivedSeasonNumber + (onGoingSeason ? 1 : 0) + 1
    ).slice(-25);

    function addOptions(option: SlashCommandSubcommandBuilder) {
      const { strings } = translator(Locale.EnglishUS);

      return option
        .addIntegerOption((option) =>
          option
            .setName(strings.bot.commands.rating_leaderboard.options.limit.name)
            .setNameLocalizations(
              localizationObject(
                (strings) =>
                  strings.bot.commands.rating_leaderboard.options.limit.name,
                undefined,
                true
              )
            )
            .setDescription(
              literals(
                strings.bot.commands.rating_leaderboard.options.limit
                  .description,
                { count: DEFAULT_LIMIT }
              )
            )
            .setDescriptionLocalizations(
              localizationObject(
                (strings) =>
                  strings.bot.commands.rating_leaderboard.options.limit
                    .description,
                { count: DEFAULT_LIMIT }
              )
            )
            .setRequired(false)
            .setMinValue(5)
            .setMaxValue(30)
        )
        .addStringOption((option) =>
          option
            .setName(
              strings.bot.commands.rating_leaderboard.options.season.name
            )
            .setNameLocalizations(
              localizationObject(
                (strings) =>
                  strings.bot.commands.rating_leaderboard.options.season.name,
                undefined,
                true
              )
            )
            .setDescription(
              strings.bot.commands.rating_leaderboard.options.season.description
            )
            .setDescriptionLocalizations(
              localizationObject(
                (strings) =>
                  strings.bot.commands.rating_leaderboard.options.season
                    .description
              )
            )
            .setRequired(false)
            .addChoices(
              ...seasonNumbers
                .map((number, index) => {
                  const current =
                    index === seasonNumbers.length - 1 && onGoingSeason;

                  return {
                    name: current
                      ? literals(
                          strings.bot.commands.rating_leaderboard.options.season
                            .choices.current,
                          { season: number }
                        )
                      : `${number}`,
                    value: `${number}`,
                    name_localizations: current
                      ? localizationObject(
                          (strings) =>
                            strings.bot.commands.rating_leaderboard.options
                              .season.choices.current,
                          { season: number }
                        )
                      : undefined,
                  } satisfies APIApplicationCommandOptionChoice<string>;
                })
                .reverse()
            )
        );
    }

    resolve({
      command: createLocalizedCommand("rating-leaderboard", [
        {
          subcommand: "neighbors",
          modify(option: SlashCommandSubcommandBuilder) {
            option.addStringOption(addUsernameChoices);
            addOptions(option);
          },
        },
        {
          subcommand: "league",
          modify(option: SlashCommandSubcommandBuilder) {
            option
              .addStringOption((option) => {
                const { strings } = translator(Locale.EnglishUS);

                return option
                  .setName(
                    strings.bot.commands.rating_leaderboard.options.league.name
                  )
                  .setNameLocalizations(
                    localizationObject(
                      (strings) =>
                        strings.bot.commands.rating_leaderboard.options.league
                          .name,
                      undefined,
                      true
                    )
                  )
                  .setDescription(
                    strings.bot.commands.rating_leaderboard.options.league
                      .description
                  )
                  .setDescriptionLocalizations(
                    localizationObject(
                      (strings) =>
                        strings.bot.commands.rating_leaderboard.options.league
                          .description
                    )
                  )
                  .addChoices(
                    ...LEAGUES.map(
                      ({ name }, value) =>
                        ({
                          name: (
                            strings.common.leagues as Record<string, string>
                          )[name],
                          value: `${value}`,
                          name_localizations: localizationObject(
                            (strings) =>
                              (
                                strings.common.leagues as Record<string, string>
                              )[name]
                          ),
                        } satisfies APIApplicationCommandOptionChoice<string>)
                    )
                  )
                  .setRequired(true);
              })
              .addStringOption(addRegionChoices);
            addOptions(option);
          },
        },
      ]),

      // BIG TODO: title seems to be in english

      async handler(interaction) {
        const { strings } = translator(interaction.locale);
        const subcommand = interaction.options.getSubcommand(true) as
          | "league"
          | "neighbors";
        const limit = interaction.options.getInteger("limit") ?? DEFAULT_LIMIT;
        const seasonOption = interaction.options.getString("season");
        const season = seasonOption
          ? parseInt(seasonOption)
          : onGoingSeason
          ? latestArchivedSeasonNumber + 1
          : latestArchivedSeasonNumber;
        const isCurrentSeason = season === latestArchivedSeasonNumber + 1;
        let titleName: string;
        let titleImage: string | undefined;
        let titleDescription: string;
        let playersAfter: number;
        let players: SimplifiedPlayer[] | undefined;
        let archivedLeaderboard: RatingLeaderboard | null;
        let playerId: number | undefined;
        let regionRatingInfo: RatingInfo | null;

        if (subcommand === "league") {
          const leagueIndex = parseInt(
            interaction.options.getString("league")!
          );
          const region = interaction.options.getString("region") as Region;
          regionRatingInfo = await (isCurrentSeason
            ? getRatingInfo(region)
            : null);

          if (
            regionRatingInfo !== null &&
            regionRatingInfo.detail !== undefined
          ) {
            return strings.bot.commands.rating_leaderboard.body
              .no_ongoing_season;
          }

          const result = isCurrentSeason
            ? await getRatingLeague(region, leagueIndex).then(async (result) =>
                result.slice(0, limit).map(
                  (player) =>
                    ({
                      id: player.spa_id,
                      score: player.score,
                      position: player.number,
                      clan: player.clan_tag,
                      nickname: player.nickname,
                    } satisfies SimplifiedPlayer)
                )
              )
            : await getArchivedRatingLeaderboard(region, season!).then(
                async (players) => {
                  const firstPlayerIndex =
                    leagueIndex === 0
                      ? 0
                      : players.version!.value.entries.findIndex(
                          (player) =>
                            player.score < LEAGUES[leagueIndex - 1].minScore
                        );
                  const lastPlayerIndex = firstPlayerIndex + limit - 1;
                  const trimmed = players.version!.value.entries.slice(
                    firstPlayerIndex,
                    lastPlayerIndex + 1
                  );
                  const clanData = await getClanAccountInfo(
                    region,
                    trimmed.map(({ id }) => id),
                    ["clan"]
                  );

                  return trimmed.map(
                    (player, index) =>
                      ({
                        id: player.id,
                        score: player.score,
                        position: firstPlayerIndex + index + 1,
                        clan: clanData[player.id]?.clan?.tag,
                        nickname:
                          clanData[index]?.account_name ??
                          literals(
                            strings.bot.commands.rating_leaderboard.body
                              .deleted_player,
                            { id: player.id }
                          ),
                      } satisfies SimplifiedPlayer)
                  );
                }
              );
          const leagueInfo = LEAGUES[leagueIndex];
          archivedLeaderboard = await getArchivedRatingLeaderboard(
            region,
            season
          );

          players = result;
          playersAfter =
            (regionRatingInfo === null
              ? archivedLeaderboard.version!.value.entries.length
              : regionRatingInfo.count) - result[result.length - 1].position;
          titleName = `${
            leagueInfo
              ? (strings.common.leagues as Record<string, string>)[
                  LEAGUES[leagueInfo.index].name
                ]
              : ""
          } - ${strings.common.regions.short[region]}`;
          titleImage = imgur(leagueInfo.icon);
          titleDescription = literals(
            strings.bot.commands.rating_leaderboard.body.top_players,
            { count: limit }
          );
        } else {
          const { region, id } = await resolvePlayerFromCommand(interaction);
          regionRatingInfo = isCurrentSeason
            ? await getRatingInfo(region)
            : null;

          if (
            regionRatingInfo !== null &&
            regionRatingInfo.detail !== undefined
          ) {
            return strings.bot.commands.rating_leaderboard.body
              .no_ongoing_season;
          }

          const accountInfo = await getAccountInfo(region, id);
          const clan = (await getClanAccountInfo(region, id, ["clan"]))?.clan;
          const neighbors = isCurrentSeason
            ? await getRatingNeighbors(region, id, Math.round(limit / 2)).then(
                (players) =>
                  players.neighbors.map(
                    (player) =>
                      ({
                        id: player.spa_id,
                        position: player.number,
                        score: player.score,
                        clan: player.clan_tag,
                        nickname: player.nickname,
                      } satisfies SimplifiedPlayer)
                  )
              )
            : await getArchivedRatingLeaderboard(region, season!).then(
                async (players) => {
                  const playerIndex = players.version!.value.entries.findIndex(
                    (player) => player.id === id
                  );

                  if (playerIndex === -1) {
                    throw new UserError(
                      literals(
                        strings.bot.commands.rating_leaderboard.body
                          .no_participation,
                        { player: markdownEscape(accountInfo.nickname), season }
                      )
                    );
                  }

                  const halfRange = Math.round(limit / 2);
                  const trimmed = players.version!.value.entries.slice(
                    playerIndex - halfRange,
                    playerIndex + halfRange + 1
                  );
                  const clanData = await getClanAccountInfo(
                    region,
                    trimmed.map((player) => player.id),
                    ["clan"]
                  );

                  return trimmed.map((player, index) => ({
                    id: player.id,
                    score: player.score,
                    position: playerIndex + index + 1,
                    clan: clanData[index]?.clan?.tag,
                    nickname: clanData[index]
                      ? clanData[index]!.account_name
                      : `Deleted ${player.id}`,
                  }));
                }
              );
          archivedLeaderboard = await getArchivedRatingLeaderboard(
            region,
            season
          );

          players = neighbors;
          titleImage = clan
            ? `https://wotblitz-gc.gcdn.co/icons/clanEmblems1x/clan-icon-v2-${clan.emblem_set_id}.png`
            : undefined;
          titleName = neighbors ? accountInfo.nickname : "";
          titleDescription =
            strings.bot.commands.rating_leaderboard.body.neighbors;
          playersAfter =
            (regionRatingInfo === null
              ? archivedLeaderboard.version!.value.entries.length
              : regionRatingInfo.count) -
            neighbors[neighbors.length - 1].position;
          playerId = id;
        }

        const items = players.map((player) => {
          const midnightIndex =
            archivedLeaderboard?.version!.value.entries.findIndex(
              (item) => item.id === player.id
            );
          const midnightScore =
            midnightIndex === undefined
              ? player.score
              : archivedLeaderboard!.version!.value.entries[midnightIndex]
                  .score;
          const midnightPosition =
            midnightIndex === undefined ? player.position : midnightIndex + 1;

          return (
            <Leaderboard.Item
              nickname={player.nickname}
              score={player.score}
              position={player.position}
              clan={player.clan}
              deltaScore={player.score - midnightScore}
              deltaPosition={midnightPosition - player.position}
              key={player.id}
              highlight={player.id === playerId}
            />
          );
        });

        return (
          <CommandWrapper>
            <TitleBar
              title={titleName}
              image={titleImage}
              description={titleDescription}
            />

            {items && (
              <Leaderboard.Root>
                {items}
                {playersAfter > 0 && (
                  <Leaderboard.Gap
                    message={literals(
                      strings.bot.commands.rating_leaderboard.body.more,
                      { count: playersAfter.toLocaleString(interaction.locale) }
                    )}
                  />
                )}
              </Leaderboard.Root>
            )}
          </CommandWrapper>
        );
      },

      autocomplete: autocompleteUsername,
    });
  }
);