'use server';

import { sessionUser } from '@/auth';
import prisma from './prisma';
import {
  ChatWithMessages,
  MessageAssistantResponse,
  MessageFilterParams,
  MessageUserInput,
} from '../types';
import { revalidatePath } from 'next/cache';
import { Chat } from '@prisma/client';
import { isValidDate } from '../utils';

async function getUserConnect() {
  const { id: userId } = await sessionUser();
  return userId
    ? {
        user: {
          connect: { id: userId }, // Connect the chat to an existing user
        },
      }
    : {};
}

/**
 * Finds or creates a user in the database based on the provided email and name.
 * If the user already exists, it returns the existing user.
 * If the user doesn't exist, it creates a new user and returns it.
 *
 * @param email - The email of the user.
 * @param name - The name of the user.
 * @returns A promise that resolves to the user object.
 */
export async function dbFindOrCreateUser(
  email: string,
  name: string,
  avatar?: string | null,
) {
  // Try to find the user by email
  const user = await prisma.user.findUnique({
    where: { email: email },
  });

  // If the user doesn't exist, create it
  if (user) {
    if (!user.avatar && avatar) {
      await prisma.user.update({
        where: { email: email },
        data: { avatar: avatar },
      });
    }
    return user;
  } else {
    return prisma.user.create({
      data: {
        email: email,
        name: name,
        avatar: avatar,
      },
    });
  }
}

/**
 * Retrieves a user from the database based on the provided ID.
 * @param id - The ID of the user to retrieve.
 * @returns A Promise that resolves to the user object if found, or null if not found.
 */
export async function dbGetUser(id: string) {
  // Try to find the user by email
  return await prisma.user.findUnique({
    where: { id },
  });
}

/**
 * Retrieves all chat records from the database for the current user.
 * @returns A promise that resolves to an array of Chat objects.
 */
export async function dbGetMyChatList(): Promise<Chat[]> {
  const { id: userId } = await sessionUser();

  if (!userId) return [];

  return prisma.chat.findMany({
    where: { userId },
    orderBy: {
      createdAt: 'desc',
    },
  });
}

/**
 * Retrieves a chat with messages from the database based on the provided ID.
 * @param id - The ID of the chat to retrieve.
 * @returns A Promise that resolves to a ChatWithMessages object if found, or null if not found.
 */
export async function dbGetChat(id: string): Promise<ChatWithMessages | null> {
  return prisma.chat.findUnique({
    where: { id },
    include: {
      messages: {
        orderBy: {
          createdAt: 'asc',
        },
      },
    },
  });
}

/**
 * Creates a new chat in the database with the provided information.
 * @param {Object} options - The options for creating the chat.
 * @param {string} options.id - The ID of the chat (optional).
 * @param {string} options.title - The title of the chat (optional).
 * @param {MessageUserInput} options.message - The message to be added to the chat.
 * @returns {Promise<Chat>} - A promise that resolves to the created chat.
 */
export async function dbPostCreateChat({
  id,
  title,
  mediaUrl,
  message,
}: {
  id?: string;
  title?: string;
  mediaUrl: string;
  message: MessageUserInput;
}) {
  const userConnect = await getUserConnect();
  try {
    const response = await prisma.chat.create({
      data: {
        id,
        ...userConnect,
        mediaUrl,
        title,
        messages: {
          create: [{ ...message, ...userConnect }],
        },
      },
      include: {
        messages: true,
      },
    });

    revalidatePath('/chat');
    return response;
  } catch (error) {
    console.error(error);
  }
}

/**
 * Creates a new message in the database for a given chat.
 * @param chatId - The ID of the chat where the message will be created.
 * @param message - The message to be created.
 */
export async function dbPostCreateMessage(
  chatId: string,
  message: MessageUserInput,
) {
  const userConnect = await getUserConnect();

  const resp = await prisma.message.create({
    data: {
      ...message,
      ...userConnect,
      chat: {
        connect: { id: chatId },
      },
    },
  });

  revalidatePath('/chat');
  return resp;
}

/**
 * Updates a message in the database with the provided response.
 * @param messageId - The ID of the message to update.
 * @param messageResponse - The response to update the message with.
 */
export async function dbPostUpdateMessageResponse(
  messageId: string,
  messageResponse: MessageAssistantResponse,
  shouldRevalidatePath = true,
) {
  await prisma.message.update({
    data: {
      response: messageResponse.response,
      result: messageResponse.result ?? undefined,
      responseBody: messageResponse.responseBody,
      streamDuration: messageResponse.streamDuration,
    },
    where: {
      id: messageId,
    },
  });

  shouldRevalidatePath && revalidatePath('/chat');
}

export async function dbDeleteChat(chatId: string) {
  await prisma.chat.delete({
    where: { id: chatId },
  });

  revalidatePath('/chat');

  return;
}

/**
 * Retrieves all messages from the database based on a given date.
 * @param date - The date in the format 'YYYY-MM-DD'.
 * @returns A promise that resolves to an array of messages.
 * @throws Error if the provided date is not valid.
 */
export async function dbInternalGetAllMessageByDate(
  messageFilter: MessageFilterParams,
) {
  const { date, includeExamples } = messageFilter;
  // date must be in the format 'YYYY-MM-DD'
  if (!isValidDate(date)) {
    throw Error('Not valid date');
  }

  return prisma.message.findMany({
    select: {
      id: true,
      chatId: true,
      prompt: true,
      mediaUrl: true,
      result: true,
    },
    where: {
      createdAt: {
        gte: new Date(date + 'T00:00:00Z'),
        lt: new Date(date + 'T23:59:59Z'),
      },
      mediaUrl: includeExamples
        ? undefined
        : { not: { contains: '/examples/' } },
    },
  });
}