//
// Copyright 2021 Vulcanize, Inc.
//

import assert from 'assert';
import { Connection, ConnectionOptions, DeepPartial, FindConditions, FindManyOptions, QueryRunner } from 'typeorm';
import path from 'path';

import { Database as BaseDatabase, QueryOptions, Where } from '@vulcanize/util';

import { Allowance } from './entity/Allowance';
import { Balance } from './entity/Balance';
import { Contract } from './entity/Contract';
import { Event } from './entity/Event';
import { SyncStatus } from './entity/SyncStatus';
import { BlockProgress } from './entity/BlockProgress';

export class Database {
  _config: ConnectionOptions
  _conn!: Connection
  _baseDatabase: BaseDatabase;

  constructor (config: ConnectionOptions) {
    assert(config);

    this._config = {
      ...config,
      entities: [path.join(__dirname, 'entity/*')]
    };

    this._baseDatabase = new BaseDatabase(this._config);
  }

  async init (): Promise<void> {
    this._conn = await this._baseDatabase.init();
  }

  async close (): Promise<void> {
    return this._baseDatabase.close();
  }

  async getBalance ({ blockHash, token, owner }: { blockHash: string, token: string, owner: string }): Promise<Balance | undefined> {
    return this._conn.getRepository(Balance)
      .createQueryBuilder('balance')
      .where('block_hash = :blockHash AND token = :token AND owner = :owner', {
        blockHash,
        token,
        owner
      })
      .getOne();
  }

  async getAllowance ({ blockHash, token, owner, spender }: { blockHash: string, token: string, owner: string, spender: string }): Promise<Allowance | undefined> {
    return this._conn.getRepository(Allowance)
      .createQueryBuilder('allowance')
      .where('block_hash = :blockHash AND token = :token AND owner = :owner AND spender = :spender', {
        blockHash,
        token,
        owner,
        spender
      })
      .getOne();
  }

  async saveBalance ({ blockHash, blockNumber, token, owner, value, proof }: DeepPartial<Balance>): Promise<Balance> {
    const repo = this._conn.getRepository(Balance);
    const entity = repo.create({ blockHash, blockNumber, token, owner, value, proof });
    return repo.save(entity);
  }

  async saveAllowance ({ blockHash, blockNumber, token, owner, spender, value, proof }: DeepPartial<Allowance>): Promise<Allowance> {
    const repo = this._conn.getRepository(Allowance);
    const entity = repo.create({ blockHash, blockNumber, token, owner, spender, value, proof });
    return repo.save(entity);
  }

  async getContracts (): Promise<Contract[]> {
    const repo = this._conn.getRepository(Contract);

    return this._baseDatabase.getContracts(repo);
  }

  async createTransactionRunner (): Promise<QueryRunner> {
    return this._baseDatabase.createTransactionRunner();
  }

  async getProcessedBlockCountForRange (fromBlockNumber: number, toBlockNumber: number): Promise<{ expected: number, actual: number }> {
    const repo = this._conn.getRepository(BlockProgress);

    return this._baseDatabase.getProcessedBlockCountForRange(repo, fromBlockNumber, toBlockNumber);
  }

  async getEventsInRange (fromBlockNumber: number, toBlockNumber: number): Promise<Array<Event>> {
    const repo = this._conn.getRepository(Event);

    return this._baseDatabase.getEventsInRange(repo, fromBlockNumber, toBlockNumber);
  }

  async saveEventEntity (queryRunner: QueryRunner, entity: Event): Promise<Event> {
    const repo = queryRunner.manager.getRepository(Event);
    return this._baseDatabase.saveEventEntity(repo, entity);
  }

  async getBlockEvents (blockHash: string, where: Where, queryOptions: QueryOptions): Promise<Event[]> {
    const repo = this._conn.getRepository(Event);

    return this._baseDatabase.getBlockEvents(repo, blockHash, where, queryOptions);
  }

  async saveEvents (queryRunner: QueryRunner, block: DeepPartial<BlockProgress>, events: DeepPartial<Event>[]): Promise<BlockProgress> {
    const blockRepo = queryRunner.manager.getRepository(BlockProgress);
    const eventRepo = queryRunner.manager.getRepository(Event);

    return this._baseDatabase.saveEvents(blockRepo, eventRepo, block, events);
  }

  async saveContract (queryRunner: QueryRunner, address: string, kind: string, checkpoint: boolean, startingBlock: number): Promise<Contract> {
    const repo = queryRunner.manager.getRepository(Contract);

    return this._baseDatabase.saveContract(repo, address, kind, checkpoint, startingBlock);
  }

  async updateSyncStatusIndexedBlock (queryRunner: QueryRunner, blockHash: string, blockNumber: number, force = false): Promise<SyncStatus> {
    const repo = queryRunner.manager.getRepository(SyncStatus);

    return this._baseDatabase.updateSyncStatusIndexedBlock(repo, blockHash, blockNumber, force);
  }

  async updateSyncStatusCanonicalBlock (queryRunner: QueryRunner, blockHash: string, blockNumber: number, force = false): Promise<SyncStatus> {
    const repo = queryRunner.manager.getRepository(SyncStatus);

    return this._baseDatabase.updateSyncStatusCanonicalBlock(repo, blockHash, blockNumber, force);
  }

  async updateSyncStatusChainHead (queryRunner: QueryRunner, blockHash: string, blockNumber: number, force = false): Promise<SyncStatus> {
    const repo = queryRunner.manager.getRepository(SyncStatus);

    return this._baseDatabase.updateSyncStatusChainHead(repo, blockHash, blockNumber, force);
  }

  async getSyncStatus (queryRunner: QueryRunner): Promise<SyncStatus | undefined> {
    const repo = queryRunner.manager.getRepository(SyncStatus);

    return this._baseDatabase.getSyncStatus(repo);
  }

  async getEvent (id: string): Promise<Event | undefined> {
    const repo = this._conn.getRepository(Event);

    return this._baseDatabase.getEvent(repo, id);
  }

  async getBlocksAtHeight (height: number, isPruned: boolean): Promise<BlockProgress[]> {
    const repo = this._conn.getRepository(BlockProgress);

    return this._baseDatabase.getBlocksAtHeight(repo, height, isPruned);
  }

  async markBlocksAsPruned (queryRunner: QueryRunner, blocks: BlockProgress[]): Promise<void> {
    const repo = queryRunner.manager.getRepository(BlockProgress);

    return this._baseDatabase.markBlocksAsPruned(repo, blocks);
  }

  async getBlockProgress (blockHash: string): Promise<BlockProgress | undefined> {
    const repo = this._conn.getRepository(BlockProgress);
    return this._baseDatabase.getBlockProgress(repo, blockHash);
  }

  async getBlockProgressEntities (where: FindConditions<BlockProgress>, options: FindManyOptions<BlockProgress>): Promise<BlockProgress[]> {
    const repo = this._conn.getRepository(BlockProgress);

    return this._baseDatabase.getBlockProgressEntities(repo, where, options);
  }

  async updateBlockProgress (queryRunner: QueryRunner, block: BlockProgress, lastProcessedEventIndex: number): Promise<BlockProgress> {
    const repo = queryRunner.manager.getRepository(BlockProgress);

    return this._baseDatabase.updateBlockProgress(repo, block, lastProcessedEventIndex);
  }

  async removeEntities<Entity> (queryRunner: QueryRunner, entity: new () => Entity, findConditions?: FindManyOptions<Entity> | FindConditions<Entity>): Promise<void> {
    return this._baseDatabase.removeEntities(queryRunner, entity, findConditions);
  }

  async getAncestorAtDepth (blockHash: string, depth: number): Promise<string> {
    return this._baseDatabase.getAncestorAtDepth(blockHash, depth);
  }
}
