import { PluginData } from "knub";
import { LogsPluginType, TLogFormats } from "../types";
import { LogType } from "src/data/LogType";
import {
  verboseUserMention,
  verboseUserName,
  verboseChannelMention,
  messageSummary,
  resolveMember,
  renderRecursively,
} from "src/utils";
import { SavedMessage } from "src/data/entities/SavedMessage";
import { renderTemplate, TemplateParseError } from "src/templateFormatter";
import { logger } from "src/logger";
import moment from "moment-timezone";
import { inGuildTz } from "../../../utils/timezones";

export async function getLogMessage(
  pluginData: PluginData<LogsPluginType>,
  type: LogType,
  data: any,
  formats?: TLogFormats,
): Promise<string> {
  const config = pluginData.config.get();
  const format = (formats && formats[LogType[type]]) || config.format[LogType[type]] || "";
  if (format === "") return;

  const values = {
    ...data,
    userMention: async inputUserOrMember => {
      if (!inputUserOrMember) return "";

      const usersOrMembers = Array.isArray(inputUserOrMember) ? inputUserOrMember : [inputUserOrMember];

      const mentions = [];
      for (const userOrMember of usersOrMembers) {
        let user;
        let member;

        if (userOrMember.user) {
          member = userOrMember;
          user = member.user;
        } else {
          user = userOrMember;
          member = await resolveMember(pluginData.client, pluginData.guild, user.id);
        }

        const memberConfig = pluginData.config.getMatchingConfig({ member, userId: user.id }) || ({} as any);

        mentions.push(memberConfig.ping_user ? verboseUserMention(user) : verboseUserName(user));
      }

      return mentions.join(", ");
    },
    channelMention: channel => {
      if (!channel) return "";
      return verboseChannelMention(channel);
    },
    messageSummary: (msg: SavedMessage) => {
      if (!msg) return "";
      return messageSummary(msg);
    },
  };

  if (type === LogType.BOT_ALERT) {
    const valuesWithoutTmplEval = { ...values };
    values.tmplEval = str => {
      return renderTemplate(str, valuesWithoutTmplEval);
    };
  }

  const renderLogString = str => renderTemplate(str, values);

  let formatted;
  try {
    formatted = typeof format === "string" ? await renderLogString(format) : renderRecursively(format, renderLogString);
  } catch (e) {
    if (e instanceof TemplateParseError) {
      logger.error(`Error when parsing template:\nError: ${e.message}\nTemplate: ${format}`);
      return;
    } else {
      throw e;
    }
  }

  if (typeof formatted === "string") {
    formatted = formatted.trim();

    const timestampFormat = config.format.timestamp;
    if (timestampFormat) {
      const timestamp = inGuildTz(pluginData).format(timestampFormat);
      formatted = `\`[${timestamp}]\` ${formatted}`;
    }
  }

  return formatted;
}