import { PrismaClient } from "@prisma/client";
import { getUserCredentials } from "./userService";

const prisma = new PrismaClient();

export async function getMessageInformation(id: string): Promise<{
  id: string;
  channelId: string;
  userId: string;
  text: string;
  deleted: boolean;
  replies: null | {
    messageId: string;
    repliesToId: string;
    repliesToText: string;
  };
} | null> {
  try {
    if (!id) {
      throw new Error("missing messageId");
    }

    const message = await prisma.message.findUnique({
      where: {
        id: id,
      },
    });

    if (!message) {
      throw new Error("could not find message");
    }

    // Check if this message is a reply to another message
    const replyData = await prisma.reply.findFirst({
      where: {
        messageId: id,
      },
    });

    let originalMessage = null;
    if (replyData) {
      originalMessage = await prisma.message.findUnique({
        where: {
          id: replyData.repliesToId,
        },
      });
    }

    return {
      id: message.id,
      channelId: message.channelId!,
      userId: message.userId!,
      text: message.text,
      deleted: message.deleted,
      replies: originalMessage
        ? {
            messageId: message.id,
            repliesToId: originalMessage.id,
            repliesToText: originalMessage.text,
          }
        : null,
    };
  } catch (err) {
    const errMessage = err as Error;

    if (errMessage.message === "missing messageId") {
      console.log(
        "services::actions::getMessageInformation - missing messageId",
      );
      return null;
    }

    if (errMessage.message === "could not find message") {
      console.log(
        "services::actions::getMessageInformation - unable to find message",
      );
      return null;
    }

    console.log(
      "services::actions::getMessageInformation - unknown error",
      errMessage,
    );
    return null;
  }
}

export async function getMessagesBefore(date: string, channelId: string) {
  try {
    if (!date || !channelId) {
      throw new Error("missing date or channelId");
    }

    const messages = await prisma.message.findMany({
      where: {
        channelId: channelId,
        createdAt: {
          lt: new Date(date),
        },
      },
      orderBy: {
        createdAt: "desc",
      },
      take: 50,
    });

    const messageInformationPromises = messages.map(async (message) => {
      const replyData = await prisma.reply.findFirst({
        where: {
          messageId: message.id,
        },
      });

      let originalMessage = null;
      if (replyData) {
        originalMessage = await prisma.message.findUnique({
          where: {
            id: replyData.repliesToId,
          },
        });
      }

      return {
        id: message.id,
        channelId: message.channelId!,
        userId: message.userId!,
        text: message.text,
        deleted: message.deleted,
        replies: originalMessage
          ? {
              messageId: message.id,
              repliesToId: originalMessage.id,
              repliesToText: originalMessage.text,
            }
          : null,
      };
    });

    return Promise.all(messageInformationPromises);
  } catch (err) {
    const errMessage = err as Error;

    if (errMessage.message === "missing date or channelId") {
      console.log(
        "services::actions::getMessagesBefore - missing date or channelId",
      );
      return null;
    }

    console.log(
      "services::actions::getMessagesBefore - unknown error",
      errMessage,
    );
    return null;
  }
}

export async function sendMessageToChannel(
  channelId: string,
  userId: string,
  content: string,
  token: string,
  repliedMessageId: string | null,
): Promise<{
  id: string;
  channelId: string;
  userId: string;
  text: string;
  deleted: boolean;
  replies: null | {
    messageId: string;
    repliesToId: string;
    repliesToText: string;
  };
} | null> {
  try {
    const userCreds = await getUserCredentials(userId);
    if (!userCreds || userCreds.token != token) {
      return null;
    }

    const newMessage = await prisma.message.create({
      data: {
        channelId: channelId,
        userId: userId,
        text: content,
        deleted: false,
      },
    });

    if (!newMessage) {
      return null;
    }

    let origMessage;
    if (repliedMessageId) {
      origMessage = await prisma.message.findUnique({
        where: {
          id: repliedMessageId,
        },
      });

      if (!origMessage) {
        throw new Error("could not find original message to reply to");
      }

      await prisma.reply.create({
        data: {
          messageId: newMessage.id,
          repliesToId: origMessage.id,
        },
      });
    }

    return {
      ...newMessage,
      channelId: newMessage.channelId!,
      userId: newMessage.userId!,
      replies: origMessage
        ? {
            messageId: newMessage.id,
            repliesToId: origMessage?.id,
            repliesToText: origMessage?.text,
          }
        : null,
    };
  } catch (error) {
    return null;
  }
}