import { Injectable } from '@angular/core';
import { Dexie, EntityTable, liveQuery } from 'Dexie';
import { err, ok, Result } from 'neverthrow';
import { z } from 'zod';
import { from, Observable, Subject } from 'rxjs';
import { filter } from 'rxjs/operators';
import { MessageInputDTO } from '../../dto/message/messageInputDtO';
import { MessageEntity } from '../../../domain/entity/message';


const tableSchema = z.object({
  $id: z.number().optional(),
  id: z.string().optional(),
  roomId: z.string().uuid(),
  message: z.string(),
  messageType: z.number(),
  canEdit: z.boolean(),
  oneShot: z.boolean(),
  sentAt: z.string().optional(),
  requireUnlock: z.boolean(),
  sender: z.object({
    wxUserId: z.number(),
    wxFullName: z.string(),
    wxeMail: z.string(),
    userPhoto: z.string(),
  }),
  sending: z.boolean().optional(),
  reaction: z.object({
    id: z.string(),
    reactedAt: z.string(),
    reaction: z.string(),
    sender: z.object({}),
  }).array()
})

export const IncomingMessageSchema = z.object({
  messageId: z.string().optional(),
  roomId: z.string().uuid(),
  message: z.string(),
  messageType: z.number(),
  canEdit: z.boolean(),
  oneShot: z.boolean(),
  sentAt: z.string().optional(),
  requireUnlock: z.boolean(),
  sender: z.object({
    wxUserId: z.number(),
    wxFullName: z.string(),
    wxeMail: z.string(),
    userPhoto: z.string(),
  }),
  sending: z.boolean().optional()
})


export type TableMessage = z.infer<typeof tableSchema>

// Database declaration (move this to its own module also)
export const messageDataSource = new Dexie('chat-message') as Dexie & {
  message: EntityTable<TableMessage, '$id'>;
};

messageDataSource.version(1).stores({
  message: '++$id, id, roomId, message, messageType, canEdit, oneShot, requireUnlock, messageId, info'
});
messageDataSource.message.mapToClass(MessageEntity);

@Injectable({
  providedIn: 'root'
})
export class MessageLocalDataSourceService {

  messageSubject = new Subject();

  constructor() {

    // messageDataSource.message.hook('creating', (primKey, obj, trans) => {
    //   // const newMessage = await trans.table('message').get(primKey);
    //   this.messageSubject.next(obj);
    //   // return newMessage
    // })
  }

  async setAllSenderToFalse() {
    try {
      await messageDataSource.transaction('rw', messageDataSource.message, async () => {
        // Perform the update operation within the transaction
        await messageDataSource.message.toCollection().modify({ sending: false });
      });
      console.log('All messages updated successfully.');
    } catch (error) {
      console.error('Error updating messages:', error);
    }
  }

  async getLastMessageByRoomId(roomId: string): Promise<Result<undefined|TableMessage, any>> {
    try {
      console.log({roomId})
      const lastMessage = await messageDataSource.message
        .where('roomId')
        .equals(roomId)
        .reverse()
        .sortBy('id');

      return ok(lastMessage[0]); // Get the last message
    } catch (error) {
      return err(error);
    }
  }

  async deleteByMessageId(id: string): Promise<Result<undefined|TableMessage, any>> {
    try {
      console.log(id)
      const lastMessage = await messageDataSource.message
        .where('id')
        .equals(id).delete()

      return ok(lastMessage[0]); // Get the last message
    } catch (error) {
      return err(error);
    }
  }


  async sendMessage(data: MessageInputDTO) {

    (data as TableMessage).sending = true

    try {
      const result = await messageDataSource.message.add(data)
      this.messageSubject.next({roomId: data.roomId});
      return ok(result as number)
    } catch (e) {
      return err(false)
    }

  }


  incomingSocketMessage() {

  }


 //  @ValidateSchema(tableSchema)
  async createMessage(data: MessageInputDTO) {

    try {
      const result = await messageDataSource.message.add(data)
      this.messageSubject.next({roomId: data.roomId});
      return ok(result)
    } catch (e) {
      return err(false)
    }

  }


  async messageExist({id}) {
    try {

      console.log({id});

      const existingMessage = await messageDataSource.message
      .where('id')
      .equals(id)
      .first();

      if (existingMessage) {
        return ok(existingMessage)
      } else {
        return err(false)
      }

    } catch (error) {
      return err(false);
    }

  }

  async update(data: TableMessage ) {

    try {
      console.log('update images 22222')
      const result = await messageDataSource.message.update(data.$id, data)
      return ok(result)
    } catch (e) {
      return err(false)
    }

  }


  // not used
  async updateByMessageId(data: TableMessage ) {

    try {
      const result = await messageDataSource.message.update(data.id as any, data)
      return ok(result)
    } catch (e) {
      return err(false)
    }

  }


  async findOrUpdate(data: TableMessage) {
    const findResult = await this.findMessageById(data.id)

    if(findResult.isOk()) {
      return this.update({...findResult.value, ...data})
    } else  {
      return this.createMessage(data)
    }
  }

  getItems(roomId: string) {
    return  messageDataSource.message.where('roomId').equals(roomId).toArray()
  }

  getItemsLive(roomId: string) {
    return liveQuery(() => messageDataSource.message.where('roomId').equals(roomId).sortBy('$id'))
  }


  async findMessageById(id: string) {
    try {
      const a = await messageDataSource.message.where('id').equals(id).first()

      if(a) {
        return ok(a)
      } else {
        return err('not found')
      }

    } catch (e) {
      return err('DB error')
    }

  }


  subscribeToNewMessage(roomId: string): Observable<TableMessage>  {
    return this.messageSubject.pipe(
      filter((message: TableMessage) =>
        message.roomId === roomId
      )
    )
  }


  async getOfflineMessages () {
    try {
      const allMessages = await messageDataSource.message
        .filter(msg => typeof msg.id !== 'string' && msg.sending == false)
        .toArray();

      return allMessages as MessageEntity[];
    } catch (error) {
      console.error('Error fetching messages:', error);
    }
  }
}