import { v4 as uuidv4 } from 'uuid';

import User from 'src/sdk/User';

import AbstractService from './AbstractService';

export default class DocumentService extends AbstractService {

  private constructor() {
    super();
  }

  public static createDocument(documentData: any, validatorId: string): Promise<any> {
    const ownerId = User.getInstance().getPairingId()!;

    const processData: any = {
      uid: uuidv4(),
      utype: 'document',
      isDeleted: 'false',
      created_at: new Date().toISOString(),
      updated_at: new Date().toISOString(),
      ...documentData,
    };

    const privateFields: string[] = Object.keys(processData);
    privateFields.splice(privateFields.indexOf('uid'), 1);
    privateFields.splice(privateFields.indexOf('utype'), 1);
    privateFields.splice(privateFields.indexOf('isDeleted'), 1);

    const roles: any = {
      demiurge: {
        members: [...[ownerId], validatorId],
        validation_rules: [],
        storages: []
      },
      owner: {
        members: [ownerId],
        validation_rules: [
          {
            quorum: 0.5,
            fields: [...privateFields, 'roles', 'uid', 'utype'],
            min_sig_member: 1,
          },
        ],
        storages: []
      },
      validator: {
        members: [validatorId],
        validation_rules: [
          {
            quorum: 0.5,
            fields: ['idCertified', 'roles'],
            min_sig_member: 1,
          },
          {
            quorum: 0.0,
            fields: [...privateFields],
            min_sig_member: 0,
          },
        ],
        storages: []
      },
      apophis: {
        members: [ownerId],
        validation_rules: [],
        storages: []
      }
    };

    return new Promise<any>((resolve: (processCreated: any) => void, reject: (error: string) => void) => {
      this.messageBus.createProcess(processData, privateFields, roles).then((processCreated: any) => {
        this.messageBus.notifyUpdate(processCreated.processId, processCreated.process.states[0].state_id).then(() => {
          this.messageBus.validateState(processCreated.processId, processCreated.process.states[0].state_id).then((_stateValidated: any) => {
            this.getDocumentByUid(processCreated.processData.uid).then(resolve).catch(reject);
          }).catch(reject);
        }).catch(reject);
      }).catch(reject);
    });
  }

  public static getDocuments(): Promise<any[]> {
    // Check if we have valid cache
    const items: any[] = this.getItems('_documents_');

    return this.messageBus.getProcessesDecoded((publicValues: any) =>
      publicValues['uid'] &&
      publicValues['utype'] &&
      publicValues['utype'] === 'document' &&
      publicValues['isDeleted'] &&
      publicValues['isDeleted'] === 'false' &&
      !items.map((item: any) => item.processData.uid).includes(publicValues['uid'])
    ).then((processes: any[]) => {
      if (processes.length === 0) {
        return items;
      } else {
        for (const process of processes) {
          // Update cache
          this.setItem('_documents_', process);

          items.push(process);
        }
        return items;
      }
    });
  }

  public static getDocumentByUid(uid: string): Promise<any> {
    // Check if we have valid cache
    const item: any = this.getItem('_documents_', uid);
    if (item) {
      return Promise.resolve(item);
    }

    return new Promise<any>((resolve: (process: any) => void, reject: (error: string) => void) => {
      this.messageBus.getProcessesDecoded((publicValues: any) =>
        publicValues['uid'] &&
        publicValues['uid'] === uid &&
        publicValues['utype'] &&
        publicValues['utype'] === 'document' &&
        publicValues['isDeleted'] &&
        publicValues['isDeleted'] === 'false'
      ).then((processes: any[]) => {
        if (processes.length === 0) {
          resolve(null);
        } else {
          const process: any = processes[0];

          // Update cache
          this.setItem('_documents_', process);

          resolve(process);
        }
      }).catch(reject);
    });
  }

  public static updateDocument(process: any, newData: any): Promise<void> {
    return new Promise<void>((resolve: () => void, reject: (error: string) => void) => {
      this.messageBus.updateProcess(process.processId, { updated_at: new Date().toISOString(), ...newData }, [], null).then((processUpdated: any) => {
        const newStateId: string = processUpdated.diffs[0]?.state_id;
        this.messageBus.notifyUpdate(process.processId, newStateId).then(() => {
          this.messageBus.validateState(process.processId, newStateId).then((_stateValidated) => {
            const documentUid: string = process.processData.uid;
            this.removeItem('_documents_', documentUid);

            this.getDocumentByUid(documentUid).then(resolve).catch(reject);
          }).catch(reject);
        }).catch(reject);
      }).catch(reject);
    });
  }
}